CN112642222A - Composite filter disc for smoke detection and preparation method and application thereof - Google Patents

Abstract

The invention provides a composite filter disc for smoke detection and a preparation method and application thereof, and relates to the technical field of detection materials. The composite filter disc for smoke detection provided by the invention comprises a glass fiber layer and a synthetic fiber layer which are sequentially laminated. In the invention, the glass fiber layer can ensure the filtering precision of the composite filter disc, and the synthetic fiber layer can effectively intercept and adsorb water vapor in the flue gas, and simultaneously, the air permeability is not greatly influenced. The invention adopts the double-layer composite filter disc to ensure the basic characteristics of the filter disc, such as filtration efficiency, filtration resistance, strength and the like.

Description

Composite filter disc for smoke detection and preparation method and application thereof

Technical Field

The invention relates to the technical field of detection materials, in particular to a composite filter disc for smoke detection and a preparation method and application thereof.

Background

Smoking and health are major issues worldwide. Researches find that the cigarette smoke contains more than 5000 chemical components, wherein seven main chemical components have great damage to human bodies and cause various diseases. In response to this problem, efforts have been made to explore techniques for reducing the hazards of cigarettes, but this is premised on relatively accurate analysis of the major harmful chemical constituents of smoke. By analyzing characteristics of smoke components and smoke aerosol particles, characteristics of smoking capacity, smoking frequency, smoking duration and the like, a smoking machine (ISO3308) is designed in the tobacco industry to simulate a smoking process, and further detect mainstream smoke. The key medium for trapping smoke of the smoking machine is a paper-based filter material, and the filter material commonly used in the industry at present is a filter sheet made of all glass fibers. In the test process, under the condition that the linear velocity of dioctyl phthalate aerosol is 140mm/s, the Cambridge filter sheet is required to retain at least more than 99.9 percent of particulate matters with the diameter of more than or equal to 0.3 mu m, the pressure drop of a filter system is required to be not more than 900Pa, and the content of polyacrylate adhesive is required to be not more than 5 percent (m/m). At the end of the simulated smoking, the pressure drop of the filter system does not increase more than 250 Pa. The content of each harmful substance in the mainstream smoke can be determined by analyzing the quality of each component trapped in the Cambridge filter.

With the gradual rise of electronic cigarettes at home and abroad in recent years, new requirements are provided for filter materials. The electronic cigarette has a great difference with the common cigarette in the smoking mode, and the existing Cambridge filter has certain limitation. Compared with the common cigarette (the inlet temperature is less than 30 ℃), the temperature of the smoke of the heating non-combustion electronic cigarette is higher (about 40-50 ℃) when the smoke passes through the filtering material, and the electronic cigarette also contains more moisture than the traditional cigarette, so that when the existing Cambridge filter disc is used for detecting the electronic cigarette, a large amount of water vapor is condensed at the rear end of the supplementing collector through the Cambridge filter disc, and great errors are brought to a test result. Therefore, it is urgently needed to develop a new filtering material, which can effectively intercept and adsorb water vapor in the flue gas, and can ensure the basic characteristics of the filter disc, such as filtering efficiency, filtering resistance, strength and the like. However, after analysis, the indexes of moisture absorption, filtration efficiency and filtration resistance have a serious mutual restriction relationship, and the improvement of the moisture absorption and filtration efficiency increases the filtration resistance, so that achieving the balance among the indexes is a great obstacle to be overcome in the field.

Disclosure of Invention

The invention aims to provide a composite filter disc for smoke detection and a preparation method and application thereof.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a composite filter disc for smoke detection, which comprises a glass fiber layer and a synthetic fiber layer which are sequentially laminated.

Preferably, the quantitative range of the glass fiber layer is 80-150 g/m²。

Preferably, the synthetic fiber layer has a quantitative range of 150 to 500g/m²。

Preferably, the synthetic fibers in the synthetic fiber layer include one or more of polyester fibers, polyamide fibers, vinylon fibers, aramid fibers, polyolefin fibers, tencel fibers, viscose fibers and composite fibers for bonding.

The invention provides a preparation method of the composite filter disc for smoke detection in the technical scheme, which comprises the following steps:

mixing glass fiber and water, and carrying out defibering treatment to obtain glass fiber slurry;

mixing the glass fiber slurry, the first latex, the first reinforcing auxiliary agent and the first defoaming agent to obtain glass fiber mixed slurry;

mixing synthetic fiber and water, and performing defibering treatment to obtain synthetic fiber slurry;

mixing the synthetic fiber slurry, a second dispersing agent and a second defoaming agent to obtain synthetic fiber mixed slurry;

and manufacturing the glass fiber mixed slurry and the synthetic fiber mixed slurry to obtain the composite filter disc for smoke detection.

Preferably, the mass concentration of the glass fiber slurry is 2-3.5%; the mass concentration of the synthetic fiber slurry is 2-3.5%.

Preferably, the raw material for preparing the glass fiber mixed slurry also comprises a first dispersing agent.

Preferably, the raw materials for preparing the synthetic fiber mixed pulp further comprise a second latex and a second reinforcing auxiliary agent.

Preferably, the papermaking method comprises the following steps: and carrying out double-layer composite papermaking on the glass fiber mixed slurry and the synthetic fiber mixed slurry, or combining the glass fiber mixed slurry and the synthetic fiber mixed slurry after respectively papermaking.

The invention provides an application of the composite filter disc for smoke detection in the technical scheme or the composite filter disc for smoke detection prepared by the preparation method in the technical scheme in detection of heating non-combustion electronic cigarettes.

The invention provides a composite filter disc for smoke detection, which comprises a glass fiber layer and a synthetic fiber layer which are sequentially laminated. In the invention, the glass fiber layer can ensure the filtering precision of the composite filter disc, and the synthetic fiber layer can effectively intercept and adsorb water vapor in the flue gas, and simultaneously, the air permeability is not greatly influenced. The invention adopts the double-layer composite filter disc to ensure the basic characteristics of the filter disc, such as filtration efficiency, filtration resistance, strength and the like.

Detailed Description

The invention provides a composite filter disc for smoke detection, which comprises a glass fiber layer and a synthetic fiber layer which are sequentially laminated.

In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.

The composite filter disc for smoke detection provided by the invention comprises the glass fiber layer, and the filtering precision of the composite filter disc can be ensured. In the invention, the quantitative range of the glass fiber layer is preferably 80-150 g/m²More preferably 100 to 120g/m²。

In the present invention, the glass fibers in the glass fiber layer preferably include chopped glass fibers and/or glass fiber wool. In the invention, when the glass fiber in the glass fiber layer is a mixture of chopped glass fiber and glass fiber cotton, the specific proportion of the chopped glass fiber and the glass fiber cotton is determined by matching with the overall filtration efficiency and resistance. In a specific embodiment of the present invention, the mass ratio of the chopped glass fiber to the glass fiber wool is preferably 1:3, 9:11 or 11: 9. In the invention, the length of the chopped glass fiber is preferably 3-6 mm, and the diameter of the chopped glass fiber is preferably 10-20 μm, and more preferably 10-15 μm. In the invention, the beating degree of the glass fiber cotton is preferably 10-50 DEG SR, and more preferably 34-44 DEG SR.

The invention provides smoke detectionThe composite filter disc comprises a synthetic fiber layer arranged on one side of the glass fiber layer. In the invention, the synthetic fiber layer can effectively intercept and adsorb water vapor in the smoke, and meanwhile, the air permeability is not greatly influenced. In the present invention, the synthetic fiber layer preferably has a basis weight in the range of 150 to 500g/m²More preferably 200 to 350g/m²More preferably 300 to 320g/m²。

In the present invention, the synthetic fiber in the synthetic fiber layer preferably includes one or more of a polyester fiber, a polyamide fiber, a vinylon fiber, an aramid fiber, a polyolefin fiber, a tencel fiber, a viscose fiber and a bonding composite fiber, and more preferably, a mixture of a vinylon fiber and a polyolefin fiber, a mixture of a polyester fiber and a bonding composite fiber or a mixture of a polyamide fiber and a tencel fiber. In the invention, the structure of the composite fiber for bonding is preferably a sheath-core type, and the softening point of the sheath layer is preferably 100-150 ℃. In a specific embodiment of the present invention, the bonding composite fiber is preferably a sheath-core structure polyester fiber. In a particular embodiment of the invention, the polyolefin fibers are preferably of a side-by-side configuration.

In the invention, the fineness of the synthetic fiber is preferably 1-3D, and the length is preferably 3-6 mm, and more preferably 4-5 mm.

In a specific embodiment of the present invention, when the synthetic fiber in the synthetic fiber layer is a mixture of vinylon fiber and polyolefin fiber, the mass ratio of the vinylon fiber to the polyolefin fiber is 4: 1; when the synthetic fiber in the synthetic fiber layer is a mixture of polyester fiber and polyester fiber with a sheath-core structure, the mass ratio of the polyester fiber to the polyester fiber with the sheath-core structure is preferably 9: 1; when the synthetic fiber in the fiber forming layer is a mixture of nylon fiber and tencel fiber, the mass ratio of the nylon fiber to the tencel fiber is preferably 17: 3.

In the present invention, the diameter of the composite filter for smoke detection is preferably 44mm or 92 mm. In the invention, the strength of the filter paper of the composite filter disc for smoke detection is preferably more than or equal to 0.8kN/m, the filtering efficiency is preferably more than or equal to 99.9% (under the condition that the linear velocity of dioctyl phthalate aerosol is 140mm/s, particulate matters with the diameter of more than or equal to 0.3 mu m are intercepted), and the filtering resistance is preferably less than or equal to 360 Pa.

The invention provides a preparation method of the composite filter disc for smoke detection in the technical scheme, which comprises the following steps:

mixing glass fiber and water, and carrying out defibering treatment to obtain glass fiber slurry;

mixing the glass fiber slurry, the first latex, the first reinforcing auxiliary agent and the first defoaming agent to obtain glass fiber mixed slurry;

mixing synthetic fiber and water, and performing defibering treatment to obtain synthetic fiber slurry;

mixing the synthetic fiber slurry, a second dispersing agent and a second defoaming agent to obtain synthetic fiber mixed slurry;

and manufacturing the glass fiber mixed slurry and the synthetic fiber mixed slurry to obtain the composite filter disc for smoke detection.

The invention mixes the glass fiber and water, and carries out defibering treatment to obtain the glass fiber slurry. In the present invention, the composition of the glass fibers is the same as that of the glass fibers in the glass fiber layer, and the description is omitted here. The specific method of the defibering treatment is not particularly required in the present invention, and the defibering treatment method known to those skilled in the art may be used. In a particular embodiment of the invention, the fluffing process is carried out using a hydropulper. In the present invention, the mass concentration of the glass fiber slurry is preferably 2 to 3.5%, and more preferably 2 to 3%.

After the glass fiber slurry is obtained, the glass fiber slurry, the first latex, the first reinforcing auxiliary agent and the first defoaming agent are mixed to obtain the glass fiber mixed slurry. In the present invention, the raw material for preparing the glass fiber mixed slurry preferably further includes a first dispersant. In the present invention, the first latex preferably comprises one or more of acrylic latex, vinyl acetate latex, styrene-butadiene latex, styrene-acrylic latex and aqueous polyurethane latex; the first reinforcing auxiliary agent preferably comprises one or more of polyamide epichlorohydrin resin, polyacrylamide and melamine formaldehyde resin; the first dispersing agent preferably comprises one or more of carboxymethyl cellulose, polyethylene oxide, anionic polyacrylamide and cationic polyacrylamide; the first antifoaming agent preferably includes a fatty alcohol type antifoaming agent, a grease type antifoaming agent, a hydrocarbon type antifoaming agent, or an organic silicon type antifoaming agent.

In the present invention, the first latex is preferably added in an amount of 5% or less, more preferably 1 to 3% by mass based on the oven-dried fiber mass of the glass fiber slurry; the addition amount of the first reinforcing auxiliary agent is preferably 0.05-1%, and more preferably 0.1-0.3%; the addition amount of the first dispersing agent is preferably 0.1-1.0%, and more preferably 0.3-0.7%; the addition amount of the first defoaming agent is preferably 0.01 to 0.1%, and more preferably 0.03 to 0.07%.

In the present invention, the mixing method of the glass fiber slurry, the first latex, the first reinforcing aid, the first dispersant and the first defoaming agent preferably includes: the first latex, the first reinforcing auxiliary agent, the first dispersing agent and the first defoaming agent are prepared into corresponding aqueous solutions respectively, and then the glass fiber slurry, the first latex aqueous solution, the first reinforcing auxiliary agent aqueous solution, the first dispersing agent aqueous solution and the first defoaming agent aqueous solution are mixed. The invention has no special requirements on the concentrations of the aqueous solutions corresponding to the first latex, the first reinforcing auxiliary agent, the first dispersing agent and the first defoaming agent, and the mass concentration of the finally obtained glass fiber mixed slurry is ensured to be 0.05-0.25%, and the mass concentration of the glass fiber mixed slurry is more preferably 0.1%.

Synthetic fiber and water are mixed and subjected to defibering treatment to obtain synthetic fiber slurry. In the present invention, the composition of the synthetic fibers is identical to the synthetic fibers in the synthetic fiber layer described above, and thus, the description thereof is omitted. The specific method of the defibering treatment is not particularly required in the present invention, and the defibering treatment method known to those skilled in the art may be used. In a particular embodiment of the invention, the fluffing process is carried out using a hydropulper. In the present invention, the mass concentration of the synthetic fiber slurry is preferably 2 to 3.5%, and more preferably 2 to 3%.

After the synthetic fiber slurry is obtained, the synthetic fiber slurry, the second dispersing agent and the second defoaming agent are mixed to obtain the synthetic fiber mixed slurry. In the present invention, the raw materials for preparing the synthetic fiber mixed pulp preferably further include a second latex and a second reinforcing aid. In the present invention, the second latex preferably comprises one or more of acrylic latex, vinyl acetate latex, styrene-butadiene latex, styrene-acrylic latex and aqueous polyurethane latex; the second reinforcing auxiliary agent preferably comprises one or more of polyamide epichlorohydrin resin, polyacrylamide and melamine formaldehyde resin; the second dispersing agent preferably comprises one or more of carboxymethyl cellulose, polyethylene oxide, anionic polyacrylamide and cationic polyacrylamide; the second antifoaming agent preferably includes a fatty alcohol type antifoaming agent, a grease type antifoaming agent, a hydrocarbon type antifoaming agent, or an organic silicon type antifoaming agent.

In the present invention, the second latex is preferably added in an amount of 5% or less, more preferably 1 to 3% by mass based on the oven-dried fiber mass of the synthetic fiber slurry; the addition amount of the second reinforcing auxiliary agent is preferably 0.05-1%, and more preferably 0.1-0.3%; the addition amount of the second dispersing agent is preferably 0.1-1.0%, and more preferably 0.3-0.7%; the addition amount of the second defoaming agent is preferably 0.01 to 0.1%, and more preferably 0.03 to 0.07%.

In the present invention, the mixing method of the synthetic fiber slurry, the second latex, the second reinforcing aid, the second dispersant and the second defoaming agent preferably includes: the second latex, the second enhancement auxiliary agent, the second dispersing agent and the second defoaming agent are prepared into corresponding aqueous solutions respectively, and then the synthetic fiber slurry, the second latex aqueous solution, the second enhancement auxiliary agent aqueous solution, the second dispersing agent aqueous solution and the second defoaming agent aqueous solution are mixed. The concentration of the aqueous solution corresponding to the second latex, the second reinforcing auxiliary agent, the second dispersing agent and the second defoaming agent is not required to be special, the mass concentration of the finally obtained synthetic fiber mixed slurry is ensured to be 0.05-0.25%, and the mass concentration of the synthetic fiber mixed slurry is more preferably 0.1%.

After the glass fiber mixed slurry and the synthetic fiber mixed slurry are obtained, the glass fiber mixed slurry and the synthetic fiber mixed slurry are manufactured by paper making, and the composite filter disc for smoke detection is obtained. In the present invention, the method for producing paper preferably includes: and carrying out double-layer composite papermaking on the glass fiber mixed slurry and the synthetic fiber mixed slurry, or combining the glass fiber mixed slurry and the synthetic fiber mixed slurry after respectively papermaking. In the invention, the double-layer composite paper making is preferably to obtain the composite filter disc for smoke detection by adopting a double-layer composite process and directly making paper by using a paper machine. The invention has no special requirements on the specific process of papermaking, and the papermaking process known to those skilled in the art can be adopted. In the present invention, the method of combining the glass fiber mixed pulp and the synthetic fiber mixed pulp after separately manufacturing paper comprises directly stacking the manufactured glass fiber mixed pulp and the synthetic fiber mixed pulp without pressing.

The invention also provides an application of the composite filter disc for smoke detection in the technical scheme or the composite filter disc for smoke detection prepared by the preparation method in the technical scheme in detection of the heated non-combustible electronic cigarette. In the specific application process of the invention, one side of the synthetic fiber layer in the composite filter disc for detecting the smoke is close to the smoke inlet.

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

(1) Glass fiber layer: quantitative determination of 100g/m². Mixing 25 parts by weight of chopped glass fiber (diameter of 15.0 μm and length of 3mm) and 75 parts by weight of glass fiber cotton (34 DEG SR) with water for defibering treatment to obtain glass fiber slurry with the concentration of 2 wt%; 0.3 part by weight of polyamide chloropropylene oxidePreparing an aqueous solution of a reinforcing agent from alkane resin (calculated according to absolute dry weight), and preparing an aqueous solution of a defoaming agent from 0.07 part by weight of a silicone defoaming agent (calculated according to absolute dry weight) with the model of JF-05B; 1 part by weight of styrene-acrylic latex (calculated by absolute dry weight, purchased from Beijing Oriental chemical plant) is prepared into latex aqueous solution; mixing 0.5 part by weight of polyoxyethylene with water to obtain a dispersant aqueous solution;

and mixing the glass fiber slurry, a reinforcing agent aqueous solution, a defoaming agent aqueous solution, a dispersing agent aqueous solution and a latex aqueous solution to obtain the glass fiber mixed slurry with the mass concentration of 0.1%.

(2) Synthetic fiber layer: quantitative 350g/m². Mixing 80 parts by weight of vinylon fiber (1.1 Dx 3mm) and 20 parts by weight of polypropylene fiber (parallel structure, diameter of 1.5D and length of 3mm) with water, and defibering to obtain synthetic fiber slurry with concentration of 2.5 wt%; 0.5 weight part of polyoxyethylene (calculated by absolute dry weight) is mixed with water to obtain a dispersant water solution; 0.03 part by weight (calculated according to absolute dry weight) of fatty alcohol defoaming agent is mixed with water to be processed to obtain defoaming agent aqueous solution; and mixing the synthetic fiber slurry, a defoaming agent aqueous solution and a dispersing agent aqueous solution to obtain the synthetic fiber mixed slurry with the mass concentration of 0.1%.

(3) And directly manufacturing the glass fiber mixed slurry and the synthetic fiber mixed slurry by a paper machine by adopting a double-layer composite process to obtain the double-layer composite filter paper.

(4) And cutting the filter paper into a filter disc with the diameter of 92mm or 44mm after the filter paper is manufactured, thereby obtaining the composite filter disc for smoke detection.

Example 2

(1) Glass fiber layer: quantitative determination of 120g/m². Mixing 45 parts by weight of chopped glass fiber (diameter is 15.0 mu m, length is 3mm) and 55 parts by weight of glass fiber cotton (44 DEG SR) with water for defibering treatment to obtain glass fiber slurry with the concentration of 2 wt%; preparing 0.5 part by weight of polyamide epichlorohydrin resin (calculated by absolute dry weight) into a reinforcing agent aqueous solution, and preparing 0.07 part by weight of organosilicon defoaming agent (calculated by absolute dry weight) with the model of JF-05B into a defoaming agent aqueous solution; 1.5 percent of styrene-butadiene latex(purchased from dow chemical, calculated on a dry basis) to prepare an aqueous latex solution;

and mixing the glass fiber slurry, the reinforcing agent aqueous solution, the defoaming agent aqueous solution and the latex aqueous solution to obtain the glass fiber mixed slurry with the mass concentration of 0.1%.

(2) Synthetic fiber layer: quantitative 300g/m². Mixing 90 parts by weight of polyester fiber (1 Dx 5mm) and 10 parts by weight of polyester fiber (sheath-core structure, diameter 2.0D, length 3mm) with water, and defibering to obtain synthetic fiber slurry with concentration of 2.5 wt%; mixing 1.0 part by weight (calculated by absolute dry weight) of polyamide-epichlorohydrin resin with water for treatment to obtain a reinforcing agent aqueous solution; 0.5 weight part of polyoxyethylene (calculated by absolute dry weight) is mixed with water to obtain a dispersant water solution; 0.03 part by weight (calculated according to absolute dry weight) of fatty alcohol defoaming agent is mixed with water to be processed to obtain defoaming agent aqueous solution; preparing 3 parts by weight of styrene-butadiene latex (calculated by absolute dry weight and purchased from Dow chemical) into a latex aqueous solution;

and mixing the synthetic fiber slurry, a reinforcing agent aqueous solution, a defoaming agent aqueous solution, a dispersing agent aqueous solution and a latex aqueous solution to obtain the synthetic fiber mixed slurry with the mass concentration of 0.1%.

(3) And directly manufacturing the glass fiber mixed slurry and the synthetic fiber mixed slurry by a paper machine by adopting a double-layer composite process to obtain the double-layer composite filter paper.

(4) And cutting the filter paper into a filter disc with the diameter of 92mm or 44mm after the filter paper is manufactured, thereby obtaining the composite filter disc for smoke detection.

Example 3

(1) Glass fiber layer: quantitative determination of 150g/m². Mixing 55 parts by weight of chopped glass fiber (with the diameter of 10.0 mu m and the length of 3mm) and 45 parts by weight of glass fiber cotton (44 DEG SR) with water for defibering treatment to obtain glass fiber slurry with the concentration of 2 wt%; preparing 0.3 part by weight of polyamide epichlorohydrin resin (calculated by absolute dry weight) into a reinforcing agent aqueous solution, and preparing 0.05 part by weight of organosilicon antifoaming agent (calculated by absolute dry weight) with the model of JF-05B into an antifoaming agent aqueous solution; 3.0% by weight of styrene-butadiene latex (calculated by absolute dry weight, available fromDow chemical) to prepare an aqueous latex solution;

and mixing the glass fiber slurry, the reinforcing agent aqueous solution, the defoaming agent aqueous solution and the latex aqueous solution to obtain the glass fiber mixed slurry with the mass concentration of 0.1%.

(2) Synthetic fiber layer: quantitative determination of 200g/m². Mixing 85 parts by weight of nylon fiber (3D multiplied by 3mm) and 15 parts by weight of tencel fiber with water for defibering to obtain synthetic fiber slurry with the concentration of 2.5 wt%; mixing 0.5 part by weight (calculated by absolute dry weight) of polyamide-epichlorohydrin resin with water for treatment to obtain a reinforcing agent aqueous solution; 0.5 part by weight (calculated by absolute weight) of cationic polyacrylamide is mixed with water to be treated to obtain a dispersant aqueous solution; 0.03 part by weight of organic silicon defoaming agent (calculated according to absolute dry weight) is mixed with water to be processed to obtain defoaming agent aqueous solution; 3 parts by weight of acrylic latex (calculated by absolute dry weight, purchased from luobu) is prepared into latex aqueous solution;

and mixing the synthetic fiber slurry, a reinforcing agent aqueous solution, a defoaming agent aqueous solution, a dispersing agent aqueous solution and a latex aqueous solution to obtain the synthetic fiber mixed slurry with the mass concentration of 0.1%.

(3) And directly manufacturing the glass fiber mixed slurry and the synthetic fiber mixed slurry by a paper machine by adopting a double-layer composite process to obtain the double-layer composite filter paper.

(4) And cutting the filter paper into a filter disc with the diameter of 92mm or 44mm after the filter paper is manufactured, thereby obtaining the composite filter disc for smoke detection.

Comparative example 1

F319-04 glass fiber filter disc for tobacco testing, manufactured by Whatman company.

Test example

The composite filter disc for smoke detection prepared in the embodiments 1 to 3 and the F319-04 filter disc of the comparative example 1 are subjected to performance tests, and the specific steps are as follows:

testing the total moisture of the total particulate matters of the cigarettes according to the national standard GB/T23203.1-2013;

testing nicotine in the total particulate matter of the cigarettes according to the national standard GB/T23355-2009;

the quantification of the filter disc is tested according to the national standard GB/T451.2-2002;

testing the tensile strength according to the method of the national standard GB/T12914-2008;

the filtration performance of the filter discs was tested according to the method of EN1822-4: 2000.

The detection results are shown in tables 1-2.

TABLE 1 Filter performance test of examples 1-3 and comparative example 1

As can be seen from Table 1, the composite filter disc for detecting smoke prepared by the invention greatly improves the quantification, ensures that the filtering efficiency and the filtering resistance can reach the standard requirements, and greatly improves the strength.

TABLE 2 Filter discs of examples 1-3 and comparative example 1 test moisture and nicotine content of the same heated non-combustible cigarette

As can be seen from Table 2, the nicotine content of the smoke of the composite filter sheet for smoke detection prepared by the invention is the same as that of the comparative example, and in the process of testing the electronic cigarette without burning under heating, a large amount of moisture permeates the filter sheet and is condensed in the collector when the comparative example is used, so that the test result has great deviation; when the composite filter disc for smoke detection prepared by the invention is used for testing, no water vapor penetrates through the Cambridge filter disc, the comparison ratio of the moisture test result is more than one time, and the test result is stable and credible.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The composite filter disc for smoke detection is characterized by comprising a glass fiber layer and a synthetic fiber layer which are sequentially stacked.

2. The composite filter element of claim 1, wherein the glass fiber layer has a basis weight in the range of 80 to 150g/m²。

3. The composite filter element of claim 1, wherein the synthetic fiber layer has a basis weight in the range of 150 to 500g/m²。

4. The composite filter element according to claim 1 or 3, wherein the synthetic fibers in the synthetic fiber layer comprise one or more of polyester fibers, polyamide fibers, vinylon fibers, aramid fibers, polyolefin fibers, tencel fibers, viscose fibers and composite fibers for bonding.

5. The preparation method of the composite filter disc for smoke detection as claimed in any one of claims 1 to 4, comprising the following steps:

mixing glass fiber and water, and carrying out defibering treatment to obtain glass fiber slurry;

mixing the glass fiber slurry, the first latex, the first reinforcing auxiliary agent and the first defoaming agent to obtain glass fiber mixed slurry;

mixing synthetic fiber and water, and performing defibering treatment to obtain synthetic fiber slurry;

mixing the synthetic fiber slurry, a second dispersing agent and a second defoaming agent to obtain synthetic fiber mixed slurry;

and manufacturing the glass fiber mixed slurry and the synthetic fiber mixed slurry to obtain the composite filter disc for smoke detection.

6. The preparation method according to claim 5, wherein the mass concentration of the glass fiber slurry is 2-3.5%; the mass concentration of the synthetic fiber slurry is 2-3.5%.

7. The method according to claim 5, wherein the raw material for preparing the glass fiber mixed slurry further comprises a first dispersant.

8. The method according to claim 5, wherein the raw material for preparing the synthetic fiber mixed slurry further comprises a second latex and a second reinforcing aid.

9. The method according to claim 5, wherein the papermaking method comprises: and carrying out double-layer composite papermaking on the glass fiber mixed slurry and the synthetic fiber mixed slurry, or combining the glass fiber mixed slurry and the synthetic fiber mixed slurry after respectively papermaking.

10. The composite filter sheet for smoke detection according to any one of claims 1 to 4 or the composite filter sheet for smoke detection prepared by the preparation method according to any one of claims 5 to 9 is applied to detection of heating non-combustion electronic cigarettes.