CN113322014B - Repeatable self-adhesive tape for filter cloth splicing position and preparation method - Google Patents

Abstract

The invention belongs to the field of industrial filter cloth, and provides a repeatable self-adhesive tape for a filter cloth splicing part and a preparation method. The base material of the repeatable self-adhesive tape is a magic tape, the magic tape comprises two adhesive layer surfaces, one surface is a fiber layer, and the other surface is Mao Ciceng; the fiber layer and the burr layer are coated with a glue coating layer; the glue coating layer is coated on the surfaces of the fibers and the burrs, and the roots of the fibers and the burrs form a coating; the back of the magic tape is a hot melt adhesive layer; during the use, the two sides (fiber layer and Mao Ciceng) of the self-adhesive tape are respectively stuck to the joints of the filter cloth through hot melting at the splicing joints of the filter cloth, then the fiber layer is tightly attached to the burr layer, the fibers and the burrs are connected, and meanwhile, the bonding coating is tightly combined and entangled, so that the bonding firmness and tightness are greatly improved, material leakage is prevented, and the bonding coating can be repeatedly bonded.

Description

Repeatable self-adhesive tape for filter cloth splicing position and preparation method

Technical Field

The invention belongs to the field of industrial filter cloth, and particularly relates to a repeatable self-adhesive tape for a filter cloth splicing part and a preparation method.

Background

Industrial filter cloth is a conventional consumable used for filtering liquid impurities, removing dust, filtering air, separating, etc. in industrial production at present. The industrial filter cloth generally includes polypropylene filter cloth, polyester filter cloth, nylon filter cloth, vinylon filter cloth, all-cotton filter cloth, PP nonwoven cloth, etc. according to different materials. The industrial filter cloth is widely applied to the fields of central air conditioners, dust collectors, air filters, metallurgy and chemical engineering, food pharmacy, paper making and the like. According to specific requirements, filter cloth made of different materials and with different weaving densities can be selected. The batch large-scale weaving process technology of the filter cloth is mature at present, however, the filter cloth needs to be cut and spliced to form different shapes such as pocket-shaped and conical belts to be used for a filter device when in use, and the joint treatment at the splicing part becomes a difficult problem. Conventionally, a sewing technology is adopted, the sewing technology is simple and efficient, but on one hand, needle and thread sewing has more needle holes and becomes a hidden trouble of material leakage; on the other hand, the special-shaped piece is difficult to sew, and the special-shaped piece cannot be removed after sewing, so that the special-shaped piece is inconvenient to install and clean.

Therefore, the technical personnel hope that the filter cloth can be well spliced and can be detached at any time, which is very convenient for detaching and washing the filter cloth, and the like. Chinese patent publication No. CN206325278U discloses a vertical, horizontal and belt type filter cloth, which adopts buckles to splice and connect filter cloth, the buckles adopt stainless steel bolts to connect, can be disassembled, greatly facilitates the assembly of the filter cloth in use, and has high connection strength. But according to the user's reflection, current buckle is connected and is the stereoplasm material, and the laminating degree is lower, and the junction leaks the material easily moreover, influences the filtering separation effect.

The magic tape is a very convenient connecting belt, one surface of the magic tape is usually fine and soft fiber, the other surface of the magic tape is provided with harder barbed hair with hooks, the two surfaces can be well connected through a hook chain, and the magic tape is applied to clothes, shoes, sofas, vehicles and boats and the like at present. The application of the convenient connection and the disassembly is used for the splicing connection of the filter cloth, which greatly facilitates the installation, the disassembly and the washing of the filter cloth. However, the existing magic tape has poor connection strength and a gap after the magic tape is pasted, so that the use effect of the filter cloth is influenced. Particularly for filtering fine particles, the particles can easily penetrate through the thorn hairs and the fiber connection parts of the magic tape. .

Disclosure of Invention

In order to realize good splicing and convenient disassembly of the industrial filter cloth, the invention provides a repeatable self-adhesive tape used at the splicing position of the filter cloth, and further provides a method for preparing the self-adhesive tape.

In order to achieve the technical effects, the specific technical scheme provided by the invention is as follows:

a can be used for the self-adhesive tape repeatedly of filter cloth splice, the said can be repeated the self-adhesive tape substrate is the magic tape, the magic tape is two and pastes the layer, one side is the fibrous layer, another side is Mao Ciceng; the fiber layer and the burr layer are coated with a glue coating layer; the glue coating layer is coated on the surfaces of the fibers and the burrs, and the roots of the fibers and the burrs form a coating; the back of the magic tape is a hot melt adhesive layer;

the repeatable self-adhesive tape is prepared by the following method:

(1) Uniformly dispersing 40-50 parts of polyether polyol, 6-7 parts of acrylic resin, 1-3 parts of esterified starch, 0.1-0.2 part of fluorocarbon resin powder and 1-1.5 parts of catalyst according to parts by weight; then adding 30-50 parts of diisocyanate, stirring uniformly to obtain glue solution, immediately spraying the fiber layer and the burr layer of the magic tape under high pressure to enable the glue solution to wrap the fibers and the burrs and penetrate the fiber layer and the burr layer to form a glue coating layer;

(2) And (2) sending the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 60-80 ℃ for 15-20min, standing and curing at room temperature for 24 h, further coating hot melt glue on the back of the magic tape, sticking an isolation release type protective film, and winding to obtain the self-adhesive tape.

Preferably, the magic tape is a polyester magic tape, the fiber layer is in a coiled filament shape, and the Mao Ciceng is barbed or mushroom-shaped. Barb or mushroom type is easy to be attached to the coiled filaments of the fiber layer to form basic adhesion; the rubber coating on fibre, burr surface and the rubber coating of root have good from the adhesion, and when fibrous layer and burr layer bonded, the adhesion strength was strengthened to the spreading layer, and simultaneously, the spreading layer combines closely, prevents effectively that the space from leaking the material.

Preferably, the polyether polyol is selected from Shanghai Gao Qiao GEP-330N polyether polyol. The glue coating layer formed by curing has excellent elasticity and is beneficial to close fitting.

Preferably, the esterified starch is maleic anhydride esterified starch, which has good adhesiveness and dispersibility and is beneficial to uniform dispersion of a glue coating layer.

Preferably, the fluorocarbon resin powder is polytetrafluoroethylene resin powder with the particle size smaller than 10 microns, and is used in the adhesive coating layer, so that the adhesive coating layer keeps good water and oil repellency, the acid and alkali resistance is excellent, and the self-adhesive tape is prevented from being corroded by filtrate on the self-adhesive layer during filtration after being used for sticking the filter cloth. However, the amount should not be too high, and the use of the polytetrafluoroethylene resin powder too high will affect the bonding strength.

Preferably, the catalyst is triethylene diamine and is used for catalyzing curing of the glue coating layer.

Preferably, the diisocyanate is at least one of toluene diisocyanate and diphenylmethane-4,4' -diisocyanate.

Preferably, in the step (2), the hot melt adhesive is one of EVA hot melt adhesive and nylon hot melt adhesive, and can be hot-melt bonded with the filter cloth by coating the hot melt adhesive.

Further provides a preparation method of the repeatable self-adhesive tape for the splicing position of the filter cloth, which comprises the following specific preparation processes:

(1) Uniformly dispersing 40-50 parts of polyether polyol, 6-7 parts of acrylic resin, 1-3 parts of maleic anhydride esterified starch, 0.5-1 part of fluorocarbon resin powder and 1-1.5 parts of catalyst according to parts by weight; then adding 30-50 parts of diisocyanate, stirring uniformly to obtain glue solution, immediately spraying the fiber layer and the burr layer of the magic tape under high pressure to enable the glue solution to permeate into the fiber layer and the burr layer to form a glue coating layer;

(2) And (2) feeding the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 60-80 ℃ for 15-20min, standing and curing at room temperature for 24 hours, further coating hot melt adhesive on the back of the magic tape, sticking an isolation release type protective film, and winding to obtain the repeatable self-adhesive tape for the filter cloth splicing part.

Preferably, the glue solution is sprayed at a high pressure in the step (1), the pressure is 0.1-0.15MPa, and the glue solution is sprayed at a certain pressure, so that the glue solution is uniformly coated on the surfaces of the fibers and the burrs and simultaneously permeates into the fiber layer and the burr layer to form a glue coating layer at the root. The glue solution is easy to adhere between fibers and between burrs to damage the magic tape linking structure due to the over-low pressure; the glue solution is easy to coat the surfaces of the fibers and the burrs due to overlarge pressure.

The invention aims at realizing good splicing of industrial filter cloth and the splicing part can be detached at any time, thereby providing a self-adhesive tape capable of repeatedly self-adhering. The excellent effect is that the joint at the filter cloth is pasted respectively at the two sides (fibre layer and Mao Ciceng) the back of self-adhesive tape through the hot melt in filter cloth splice joint department during the use, then fibre layer and burr layer closely laminate, can accomplish the concatenation, directly tear during the dismantlement can, can paste the use repeatedly.

Compared with the existing industrial filter cloth splicing technology, the repeatable self-adhesive tape for the filter cloth splicing part and the preparation method thereof have the obvious improvement that:

(1) The repeated self-adhesive tape can be used for repeatedly sticking and splicing the filter cloth, is convenient to use, and facilitates the filter cloth to be unpicked and washed.

(2) The repeated self-adhesive tape enables the fibers, the burrs and the joint surface to be coated with the adhesive coating on the basis of the magic tape, the fibers and the burrs are connected and the adhesive coating is tightly combined and entangled during sticking, the sticking firmness and tightness are greatly improved, material leakage is prevented, and the adhesive coating can be repeatedly stuck.

(3) After the self-adhesive tape is repeatedly adhered, the adhesive layer has hydrophobic and oleophobic properties, and the erosion of filtrate on the adhesive layer during liquid filtration is prevented.

(4) The preparation method is simple and practical, has wide practicability, and is suitable for splicing filtration cloth for air purification, dust removal and general filtrate.

Drawings

To facilitate further understanding, the repeated self-adhesive tape of the present invention is described below with reference to the simplified schematic drawings:

fig. 1 is a schematic view of the self-adhesive tape of the present invention. Wherein:

1-hot melt adhesive layer on back of the magic tape fiber layer;

2-gluing a fiber layer;

3-fiber layer fibers;

4-hot melt adhesive layer on the back of the magic tape burr layer;

5-coating a burr layer with glue;

6-burr layer burr.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without any inventive step based on the technical idea of the present invention shall fall within the scope of protection of the present invention.

Example 1

(1) Uniformly dispersing 40 parts of polyether polyol GEP-330N, 7 parts of acrylic resin, 2 parts of maleic anhydride esterified starch, 0.2 part of polytetrafluoroethylene resin powder with the particle size of less than 10 mu m and 1.5 parts of triethylene diamine in parts by weight; then adding 40 parts of diphenylmethane-4,4' -diisocyanate, stirring for 1 minute to obtain a glue solution, selecting a polyester magic tape untreated object, spraying the glue solution on a fiber layer and a burr layer of the magic tape respectively under the pressure of 0.1MPa, controlling the spraying amount until gaps of the fiber layer and the burr layer are not blocked, actually controlling the spraying residence time to be 3 seconds, uniformly coating the glue solution on the surfaces of the fiber and the burr by spraying the glue solution, and simultaneously permeating the fiber layer and the burr layer to form a glue coating layer at the root.

(2) And (2) sending the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 80 ℃ for 20min, standing and curing at room temperature for 24 h, further coating nylon hot melt adhesive with the thickness of 1mm on the back surface of the magic tape, pasting an isolation release type protective film, and winding to obtain the self-adhesive tape. As shown in the attacheddrawing 1, in the drawing, 1 is a hot melt adhesive layer on the back of a fiber layer of a magic tape; 2, gluing a fiber layer; 3 is fiber layer fiber; 4, a hot melt adhesive layer is arranged on the back of the magic tape burr layer; 5, coating a burr layer with glue; and 6, burr layer burr.

Example 2

(1) Uniformly dispersing 50 parts of polyether polyol GEP-330N, 7 parts of acrylic resin, 2 parts of maleic anhydride esterified starch, 0.1 part of polytetrafluoroethylene resin powder with the particle size of less than 10 mu m and 1.5 parts of triethylene diamine in parts by weight; then adding 40 parts of diphenylmethane-4,4' -diisocyanate, stirring for 1 minute to obtain a glue solution, selecting a polyester magic tape untreated object, spraying the glue solution on a fiber layer and a burr layer of the magic tape respectively under the pressure of 0.15MPa, controlling the spraying amount until gaps of the fiber layer and the burr layer are not blocked, actually controlling the spraying residence time to be 3 seconds, uniformly coating the glue solution on the surfaces of the fiber and the burr by spraying the glue solution, and simultaneously permeating the fiber layer and the burr layer to form a glue coating layer at the root.

(2) And (2) sending the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 70 ℃ for 20min, standing and curing at room temperature for 24 h, further coating nylon hot melt adhesive with the thickness of 1mm on the back surface of the magic tape, pasting an isolation release type protective film, and winding to obtain the self-adhesive tape.

Comparative example 1

(1) Uniformly dispersing 40 parts of polyether polyol GEP-330N, 7 parts of acrylic resin, 2 parts of maleic anhydride esterified starch and 1.5 parts of triethylene diamine according to parts by weight; then adding 40 parts of diphenylmethane-4,4' -diisocyanate, stirring for 1 minute to obtain a glue solution, selecting a polyester magic tape untreated object, spraying the glue solution on a fiber layer and a burr layer of the magic tape respectively under the pressure of 0.1MPa, controlling the spraying amount until gaps of the fiber layer and the burr layer are not blocked, actually controlling the spraying residence time to be 3 seconds, uniformly coating the glue solution on the surfaces of the fiber and the burr by spraying the glue solution, and simultaneously permeating the fiber layer and the burr layer to form a glue coating layer at the root.

(2) And (2) feeding the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 80 ℃ for 20min, standing and curing at room temperature for 24 h, further coating a nylon hot melt adhesive with the thickness of 1mm on the back of the magic tape, pasting an isolation release type protective film, and winding to obtain the self-adhesive tape.

Comparative example 2

(1) Uniformly dispersing 40 parts of polyether polyol GEP-330N, 7 parts of acrylic resin, 2 parts of maleic anhydride esterified starch, 0.2 part of polytetrafluoroethylene resin powder with the particle size of less than 10 mu m and 1.5 parts of triethylene diamine according to parts by weight; then adding 40 parts of diphenylmethane-4,4' -diisocyanate, stirring for 1 minute to obtain a glue solution, selecting a polyester magic tape untreated object, spraying the glue solution on a fiber layer and a burr layer of the magic tape respectively under the pressure of 0.25MPa, controlling the spraying amount until gaps of the fiber layer and the burr layer are not blocked, actually controlling the spraying residence time to be 3 seconds, uniformly coating the glue solution on the surfaces of the fiber and the burr by spraying the glue solution, and simultaneously permeating the fiber layer and the burr layer to form a glue coating layer at the root.

(2) And (2) sending the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 80 ℃ for 20min, standing and curing at room temperature for 24 h, further coating nylon hot melt adhesive with the thickness of 1mm on the back surface of the magic tape, pasting an isolation release type protective film, and winding to obtain the self-adhesive tape.

Comparative example 3

The magic subsides of dacron material are at the nylon hot melt adhesive that back coating thickness is 1mm, as referring to the self-adhesive tape.

And (3) removing the release protective film of the self-adhesive tape obtained in the embodiment 1-2 and the comparative example 1-3, cutting 100-mesh nylon filter cloth, coating hot melt adhesive at the splicing position, heating the hot melt adhesive layer on the back surface of the self-adhesive tape, respectively bonding the back surface of the fiber layer and the back surface of the burr layer at the splicing position, cooling, splicing by self adhesion, and compacting the splicing position. Tensile peeling is carried out at a speed of 300mm/min by using a tensile tester, and the measured initial peeling strength is shown in table 1; filtering the phosphogypsum slurry, and filtering for 5 days; the color change of the filtered water was observed and recorded. The self-adhesive tape was peeled off and pasted again, flattened, and the initial peel strength was tested again as shown in table 1.

Table 1:

through tests, the self-adhesive tape obtained by the invention has high peel strength, meets the splicing requirement of the filter cloth, can be repeatedly disassembled, and has small loss of bonding strength. Especially, because the connection of the fiber and the burr and the entanglement of the bonding coating, the bonding strength and the compactness are improved, and the condition of filtrate leakage is well prevented. In the comparative example 1, no fluorocarbon resin powder was added to the glue solution, the obtained glue coating layer could not effectively prevent the erosion of the filtrate when used for bonding, and the bonding strength was significantly reduced after multiple times of use; comparative example 2 when spraying glue solution to the magic tape, the pressure is large, the glue solution is not sufficiently wrapped on the surfaces of the fiber and the burr, the sticking strength is low, the crystal nucleus compactness is poor, and the liquid leakage phenomenon exists; comparative example 3 the fiber layer and the bur layer of the velcro tape were not treated with the glue solution, and the strength after self-adhesion was low and the leakage was severe.

Claims (8)

1. A can be used for the self-adhesive tape repeatedly of filter cloth splice, the said can be repeated the self-adhesive tape substrate is the magic tape, the magic tape is two and pastes the layer, one side is the fibrous layer, another side is Mao Ciceng; the fiber layer and the burr layer are coated with a glue coating layer; the glue coating layer is coated on the surfaces of the fibers and the burrs, and the roots of the fibers and the burrs form a coating; the back of the magic tape is a hot melt adhesive layer;

the repeatable self-adhesive tape is prepared by the following method:

(1) Uniformly dispersing 40-50 parts of polyether polyol, 6-7 parts of acrylic resin, 1-3 parts of esterified starch, 0.1-0.2 part of fluorocarbon resin powder and 1-1.5 parts of catalyst in parts by weight; then adding 30-50 parts of diisocyanate, stirring uniformly to obtain glue solution, immediately spraying the fiber layer and the burr layer of the magic tape under high pressure to enable the glue solution to wrap the fibers and the burrs and penetrate the fiber layer and the burr layer to form a glue coating layer; the high-pressure spraying pressure is 0.1-0.15MPa;

(2) And (2) sending the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 60-80 ℃ for 15-20min, standing and curing at room temperature for 24 h, further coating hot melt glue on the back of the magic tape, sticking an isolation release type protective film, and winding to obtain the self-adhesive tape.

2. The repeatable self-adhesive tape for filter cloth splicing part according to claim 1, wherein: the magic tape is made of terylene materials, the fiber layer is in a coiled filament shape, and the Mao Ciceng is barbed stabs or mushroom type.

3. A repeatable self-adhesive tape for filter cloth splicing according to claim 1, wherein: the esterified starch is maleic anhydride esterified starch.

4. A repeatable self-adhesive tape for filter cloth splicing according to claim 1, wherein: the fluorocarbon resin powder is polytetrafluoroethylene resin powder with the particle size of less than 10 mu m.

5. A repeatable self-adhesive tape for filter cloth splicing according to claim 1, wherein: the catalyst is triethylene diamine.

6. A repeatable self-adhesive tape for filter cloth splicing according to claim 1, wherein: the diisocyanate is at least one of toluene diisocyanate and diphenylmethane-4,4' -diisocyanate.

7. A repeatable self-adhesive tape for filter cloth splicing according to claim 1, wherein: and (3) selecting one of EVA hot melt adhesive and nylon hot melt adhesive as the hot melt adhesive in the step (2).

8. A method for preparing the repeatable self-adhesive tape for filter cloth splicing according to any one of claims 1 to 7, which comprises the following steps:

(1) Uniformly dispersing 40-50 parts of polyether polyol, 6-7 parts of acrylic resin, 1-3 parts of maleic anhydride esterified starch, 0.1-0.2 part of fluorocarbon resin powder and 1-1.5 parts of catalyst according to parts by weight; then adding 30-50 parts of diisocyanate, stirring uniformly to obtain glue solution, immediately spraying the fiber layer and the burr layer of the magic tape under high pressure to enable the glue solution to permeate into the fiber layer and the burr layer to form a glue coating layer; the high-pressure spraying pressure is 0.1-0.15MPa;

(2) And (2) sending the magic tape with the glue coating layer in the step (1) into a constant temperature chamber, carrying out constant temperature treatment at 60-80 ℃ for 15-20min, standing and curing at room temperature for 24 h, further coating hot melt adhesive on the back of the magic tape, sticking an isolation release type protective film, and winding to obtain the repeatable self-adhesive tape for the filter cloth splicing part.

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