Detailed Description
<1> Integral Structure
The polyurethane resin composition of the present invention is used for forming a foam constituting a heat insulating material of a building, contains at least a polyisocyanate compound, a polyol compound, a trimerization catalyst, a foaming agent and a flame retardant, and does not contain a foam stabilizer and a surface conditioner.
The polyurethane resin composition of the present invention may further contain a mineral-derived material such as clay mineral.
The heat insulating layer can be formed on a building by a method of mixing and spraying the above-mentioned composition by separating it into a polyisocyanate compound (liquid 1) and the other components (liquid 2) while spraying them, a method of mixing and spraying them while mixing them, and the like.
<2> For various properties
The polyurethane resin composition of the present invention can have the following properties by adjusting the compounding of each material and the like.
<2.1> Regarding incombustibility
The polyurethane resin composition of the present invention may have a specific incombustible property by an exothermic test according to ISO-5660.
<2.1.1> For ISO-5660 test
In the exothermic test according to ISO-5660, a test device called a cone calorimeter is used.
The cone calorimeter includes a cone heater disposed above a test body cut to a predetermined size, and a spark rod disposed between the test body and the cone heater, and generates a combustible gas from the test body by heating with the cone heater, and fires the combustible gas with a spark of the spark rod, thereby generating combustion, and the total heat release amount and the like obtained by the combustion are measured by a predetermined measurement method, and flame retardancy is evaluated according to performance requirements shown in table 2 below.
TABLE 2
<2.2> For expansion upon heating (maximum expansion length)
The polyurethane resin composition of the present invention can be formed to have an expansion amount that does not cause spark contact in the execution of the ISO-5660 test.
The maximum expansion length in the height direction of the test body is set to be less than 8mm, more preferably 2mm or less, for the reference that does not cause spark contact.
With the above configuration, spark contact is avoided, and a result effective as an ISO-5660 test can be obtained.
<2.2.1> Method for measuring expansion amount
The method for measuring the expansion in the height direction of the test body is shown below.
(1) The height position of the upper surface of the test body was marked in advance on a windshield frame provided in front of the cone calorimeter before the exothermic test.
(2) After the heat release test, the height from the mark position on the windshield frame to the highest position of the expanded upper surface positions of the test body was measured by visual recognition.
<2.3> For Density
The polyurethane resin composition of the present invention may have a foam density of 30kg/m3 or more.
When the density of the foam is 30kg/m3 or more, a sufficient deformation suppressing effect against other impacts can be obtained when the foam is used as a heat insulating material for buildings.
<3> Polyisocyanate compound
The polyisocyanate compound is a material used as a main agent in the polyurethane resin composition of the present invention.
Examples of the polyisocyanate compound include aromatic polyisocyanates, alicyclic polyisocyanates, aliphatic polyisocyanates, and modified polyisocyanates.
Examples of the aromatic polyisocyanate include xylylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, triphenylmethane triisocyanate, naphthalene diisocyanate, and polymethylene polyphenyl polyisocyanates.
As the aforementioned alicyclic polyisocyanate, there is mentioned, examples thereof include cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, isophorone diisocyanate, and dicyclohexylmethane diisocyanate, dimethyldicyclohexylmethane diisocyanate, and the like.
Examples of the aliphatic polyisocyanate include methylene diisocyanate, ethylene diisocyanate, propylene diisocyanate, tetramethylene diisocyanate, and hexamethylene diisocyanate.
The modified polyisocyanate refers to an isocyanate-terminated prepolymer or the like obtained by reacting a polyisocyanate compound with a polyol component, and examples thereof include urethane modified products, carbodiimide modified products, urea modified products, biuret modified products, allophanate modified products and the like.
One or two or more of the aforementioned polyisocyanate compounds may be used.
In particular, polymethylene polyphenyl polyisocyanates (POLYMERIC MDI, CRUDE MDI) are preferred for the reason of being liquid at room temperature and easy availability.
Examples of the polymethylene polyphenyl polyisocyanates include Milionate MR to 200 manufactured by TOSOH CORPORATION, MR-100, MR-400, sumidule V20L, desmodur V20L manufactured by Covestro AG, PM-200 manufactured by Wanhua chemical, PM-400, PAPI27 manufactured by DOW, PAPI135, and the like.
The amount of the polyisocyanate to be blended in the polyurethane resin composition is preferably such that the isocyanate index is 150 to 1000. When the flame retardancy is 150 or more, the flame retardancy is further improved, and when the flame retardancy is 1000 or less, the adhesion to a body or the like is improved.
In particular, in the present invention, the isocyanate index is most preferably in the range of 400 to 600.
The isocyanate index is calculated from the equivalent ratio of the isocyanate groups contained in the isocyanate component to the active hydrogen contained in the polyol component, the water of the blowing agent, and the like.
[ Isocyanate group ]/[ OH group ] (molar ratio) ×100
<4> Polyol Compound
The polyol compound is a material used as a curing agent in the polyurethane resin composition of the present invention.
The polyol compound includes an ester polyol compound or an ether polyol compound, and combinations thereof.
<4.1> Ester polyol Compound
Examples of the ester polyol compound include a polymer obtained by dehydrating and condensing a polybasic acid and a polyhydric alcohol, a polymer obtained by ring-opening polymerization of a lactone such as epsilon-caprolactone or alpha-methyl epsilon-caprolactone, and a condensate of a hydroxycarboxylic acid and the above-mentioned polyhydric alcohol.
Specific examples of the polybasic acid include adipic acid, azelaic acid, sebacic acid, terephthalic acid, isophthalic acid, succinic acid, and the like. Terephthalic acid modification is preferred in view of flame retardancy.
<4.2> Other polyol Compounds
Examples of the other polyol compound include polylactone polyols, polycarbonate polyols, aromatic polyols, alicyclic polyols, aliphatic polyols, polymer polyols, polyether polyols, and the like.
Examples of the polylactone polyols include polypropylene lactone glycol, polycaprolactone glycol, and polypentanolide glycol.
Examples of the polycarbonate polyol include a polyol obtained by dealcoholization reaction of a hydroxyl group-containing compound such as ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, octylene glycol, nonylene glycol, and the like, with diethylene carbonate, dipropylene carbonate, and the like.
Examples of the aromatic polyol include bisphenol a, bisphenol F, phenol novolac, cresol novolac, and the like.
As the aforementioned alicyclic polyol, examples thereof include cyclohexanediol, methylcyclohexanediol, isophorone glycol, dicyclohexylmethane glycol, and dimethyldicyclohexylmethane glycol.
Examples of the aliphatic polyol include ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, and the like.
Examples of the polyvalent polyether polyol include polyether polyols having 2 or more active hydrogen groups, preferably 3 to 8 groups, such as aromatic and aliphatic polyamines, such as ethylene glycol, 1, 2-propylene glycol, 1, 3-propylene glycol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, 1, 8-octanediol, 1, 9-nonanediol, 3-methyl-1, 5-pentanediol, 3-dimethylol heptane, diethylene glycol, dipropylene glycol, neopentyl glycol, cyclohexane-1, 4-diol, cyclohexane-1, 4-dimethanol, dimer acid diol, bisphenol a, bis (. Beta. -hydroxyethyl) benzene, xylylene glycol, glycerin, trimethylolpropane, pentaerythritol, sucrose, or aromatic and aliphatic polyamines, such as ethylenediamine, propylenediamine, toluenediamine, m-phenylenediamine, xylylene diamine, triethanolamine, and the like, and glycidyl ethers such as glycidyl ethers obtained by polymerizing alkylene oxides, such as ethylene oxide, propylene oxide, and the like, glycidyl ethers obtained by polymerizing glycidyl ethers such as glycidyl ethers, and the like, and glycidyl ethers obtained by polymerizing glycidyl ethers such as methyl ether.
In addition, polyether polyols containing bromine, phosphorus, and the like may also be used.
<5> Mineral-derived Material
Mineral-derived materials are materials aimed at improved flame retardancy and improved density.
As the mineral-derived material, silicate compounds are preferable. Examples of mineral-derived materials that can be used include montmorillonite, saponite, hectorite, vermiculite, kaolinite, mica, and talc.
As a material containing the aforementioned kaolinite as a main component, kaolin is exemplified.
The kaolin may also contain calcined kaolin obtained by subjecting kaolin to a high temperature treatment. Calcined kaolin is preferable from the viewpoint of small water content and particle size distribution.
The content of the mineral-derived material is not particularly limited, but is preferably 15 to 85 parts by weight based on 100 parts by weight of the polyol compound.
<6> Trimerization catalyst
The trimerization catalyst is a material for trimerizing an isocyanate group contained in a polyisocyanate compound by reacting the isocyanate group and promoting formation of an isocyanurate ring.
As the trimerization catalyst, for example, nitrogen-containing aromatic compounds such as tris (dimethylaminomethyl) phenol, 2, 4-bis (dimethylaminomethyl) phenol, 2,4, 6-tris (dialkylaminoalkyl) hexahydro-S-triazine, alkali metal carboxylates such as potassium acetate, potassium 2-ethylhexanoate, potassium octoate, tetramethyl ammonium salt, tetraethyl ammonium salt, tetraphenyl ammonium salt, and the like can be used.
From the viewpoints of adhesion at low temperature and flame retardance, a combination of a metal alkyl carboxylate salt and a quaternary ammonium salt is preferable.
Examples of the trimerization catalysts include Toyocat-TRX manufactured by TOSOH CORPORATION, toyocat-TRV, toyocat-TR20, DABCO TMR manufactured by Evonik, DABCO TMR-2, DABCO TMR-7, DABCO K-15, UCAT, 18 and X, polycat46, KAOLIZER NO.410 and KAOLIZER NO.420 manufactured by Kagaku corporation.
The content of the trimerization catalyst is not particularly limited, but is preferably 1 to 20 parts by weight based on 100 parts by weight of the polyol compound. When the amount is 1 part by weight or more, the flame retardancy is further improved, and when the amount is 20 parts by weight or less, the occurrence of problems such as clogging of the mixing portion of the spray gun due to an excessively fast reaction can be suppressed.
<7> Foaming agent
The foaming agent is a material for promoting the density reduction of the molded article by generating a gas in the interior of the resin when the polyisocyanate compound (liquid 1) and the other components (liquid 2) are mixed.
As an example of the foaming agent, water may be mentioned. The isocyanate reacts with water to generate carbon dioxide, and the carbon dioxide is supplied to the inside of the foam, thereby promoting the density reduction of the molded article.
As other examples of the foaming agent, the foaming agent called a physical foaming agent as described below is given. Although liquid at ordinary temperature, the isocyanate and the polyol react exothermically to gasify inside the resin, and the density of the molded article is accelerated to decrease.
[1] Hydrocarbon compounds
Propane, butane, pentane, hexane, heptane, cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, methyl formate, and the like.
[2] Chlorinated aliphatic hydrocarbon compounds
Dichloroethane, chloropropane, chloroisopropane, chlorobutane, chloroisobutane, chloropentane, chloroisopentane, and the like.
[3] Fluorine compound
CHF3、CH2F2、CH3 F, and the like.
[4] Hydrochlorofluorocarbon compounds
Trichloromonofluoromethane, trichlorotrifluoroethane, dichloromonofluoroethane, (e.g., HCFC141b (1, 1-dichloro-1-fluoroethane), HCFC22 (chlorodifluoromethane), HCFC142b (1-chloro-1, 1-difluoroethane)), and the like.
[5] Hydrofluorocarbons
CENTRAL GLASS co., ltd. HFC-245fa (1, 3-pentafluoropropane) Honeywell International Inc. HFC-365mfc (1, 3-pentafluorobutane) is produced.
[6] Hydrofluoroolefins
Honeywell International Inc. preparation Solstice LBA (HFO-1233 zd, (E) -1-chloro-3, 3-trifluoropropene), preparation Opteon1100 (HFO-1336 mzz (Z), (Z) -1, 4-hexafluoro-2-butene), preparation The Chemours Company Opteon (HFO-1336 mzz (E), (E) -1, 4-hexafluoro-2-butene) AGC Amorea1224yd ((Z) -1-chloro-2, 3-tetrafluoropropene) and the like.
[7] Organic compound
Methyl formate, diisopropyl ether, and the like.
In addition, as the foaming agent, nitrogen, oxygen, argon, carbon dioxide gas, or the like that can be dispersed and dissolved in the polyol component or the isocyanate component may be used.
The content of the foaming agent is not particularly limited, but is preferably 1 to 100 parts by weight based on 100 parts by weight of the polyol. The foam density decreases as the weight part of the foaming agent increases, but the dimensional stability and the compressive strength decrease at the same time, so that the weight part of the foaming agent according to the density design may be set.
In the present invention, one or two or more of the above-mentioned foaming agents may be used.
<8> Flame retardant
The flame retardant is a material for imparting flame retardancy to the polyurethane resin composition of the present invention.
In the present invention, the flame retardant is not particularly limited, and a composition containing at least one selected from the group consisting of red phosphorus, ammonium polyphosphate and phosphate is preferable from the viewpoint of obtaining high flame retardancy.
In particular, if two or more types of ammonium polyphosphate and phosphate are combined in addition to red phosphorus, it is preferable from the viewpoint of obtaining further high flame retardancy.
<8.1> Red phosphorus
Red phosphorus is a material for suppressing the total heat release during combustion.
The red phosphorus used in the present invention is not limited, and commercially available products can be appropriately selected and used.
The content of the red phosphorus is not particularly limited, and is preferably 15 parts by weight to 35 parts by weight based on 100 parts by weight of the polyol compound.
<8.2> Phosphate-containing flame retardant
The phosphate-containing flame retardant is a material for suppressing the total heat release amount during combustion, similarly to red phosphorus.
The phosphate-containing flame retardant used in the present invention contains phosphoric acid.
Examples of the phosphate-containing flame retardant include phosphates containing salts of the various phosphoric acids and at least one metal or compound selected from the group consisting of metals of groups IA to IVB of the periodic table, ammonia, aliphatic amines, and aromatic amines.
Examples of the metals of groups IA to IVB of the periodic table include lithium, sodium, calcium, barium, iron (II), iron (III), and aluminum.
Examples of the aliphatic amine include methyl amine, ethyl amine, diethyl amine, triethyl amine, ethylenediamine, piperazine, and the like.
Examples of the aromatic amine include pyridine, triazine, melamine, and ammonium.
The phosphate-containing flame retardant may be treated with a silane coupling agent, or may be covered with a melamine resin, or may be added with a known foaming auxiliary such as melamine or pentaerythritol.
Specific examples of the phosphate-containing flame retardant include, for example, monophosphates, pyrophosphates, polyphosphates, and the like.
Examples of the monophosphates include ammonium salts such as ammonium phosphate, monoammonium phosphate, and diammonium phosphate, sodium phosphate, disodium phosphate, trisodium phosphate, monosodium phosphate, disodium phosphate, sodium salts such as sodium hypophosphite, monopotassium phosphate, dipotassium phosphate, tripotassium phosphate, monopotassium phosphite, dipotassium phosphite, potassium salts such as potassium hypophosphite, lithium phosphate, dilithium phosphate, trilithium phosphate, lithium phosphate, dilithium phosphite, lithium phosphate, barium hydrogen phosphate, barium phosphate, tribasic phosphate, and magnesium salts such as barium hypophosphite, magnesium phosphate, magnesium hydrogen phosphate, magnesium hypophosphite, calcium phosphate such as calcium phosphate, zinc phosphate, and zinc phosphate.
Examples of the polyphosphate include ammonium polyphosphate, piperazine polyphosphate, melamine polyphosphate, ammonium polyphosphate amide, and aluminum polyphosphate.
Among them, in order to improve the self-extinguishing property of the phosphate-containing flame retardant, it is preferable to use a polyphosphate, and it is more preferable to use ammonium polyphosphate and aluminum phosphite which forms a foaming layer when heated.
One or two or more of the above-mentioned phosphate-containing flame retardants may be used.
The content of the phosphate-containing flame retardant is not particularly limited, but is preferably 20 parts by weight to 50 parts by weight based on 100 parts by weight of the polyol compound.
<8.3> Chlorine-containing flame retardant
Chlorine-containing flame retardants are factors for suppressing the maximum heat release rate at the initial stage of combustion.
The following 5 kinds of flame retardants are used in many cases as chlorine-containing flame retardants.
(A) Tris (chloroethyl) phosphate (TCEP)
(B) Tris (. Beta. -chloropropyl) phosphate (TCPP)
(C) Tris (dichloropropyl) phosphate (TDCP)
(D) Tetra (2-chloroethyl) dichloro isopentyl diphosphate (V6)
(E) Polyoxyalkylene bis (dichloroalkyl) phosphate (CR-504L)
The content of the chlorine-containing flame retardant is not particularly limited, but is preferably 60 parts by weight to 120 parts by weight based on 100 parts by weight of the polyol compound.
<9> For foam stabilizers and surface conditioners
The foam stabilizer and the surface conditioner not included in the present invention will be described below.
<9.1> Foam stabilizer
The foam stabilizer is an organosiloxane-polyoxyalkylene copolymer used for producing polyurethane foam, or the like.
Examples of the foam stabilizer include those manufactured by MOMENTIVE, L-6900, dow Corning Toray Co., ltd.
<9.2> Surface conditioner
The surface conditioner is an additive that functions as an antifoaming agent, a leveling agent, and a wrinkle preventing agent by controlling the surface tension to form a good coating film.
Examples of the surface modifier include acrylic polymers such as SEI-W01 and SEI-1501 produced by the process of forming Nanyujin.
<10> Other
The polyurethane resin composition of the present invention may suitably contain the following materials.
<10.1> Catalyst
Catalysts used in polyurethane foam formation are materials for promoting the reaction of isocyanate with active hydrogen in polyols and the reaction of isocyanate with water.
Examples of the catalyst having an amine group include triethylenediamine, N, N, N ', N ", N" -pentamethyldiethylenetriamine, N, N, N ', N ' -tetramethyl-1, 6-hexanediamine, N, N, N ', N ' -tetramethylethylenediamine and other N-alkylpolyalkylene polyamines, N ' - (2-hydroxyethyl) -N, N, N ' -trimethylethylenediamine, 1- (2-dimethylaminoethyl) -4-methylpiperazine, 1, 2-dimethylimidazole, 1-isobutyl-2-methylimidazole, N-methylmorpholine, N-ethylmorpholine, N, N-dimethylaminoethylmorpholine, dimethylcyclohexylamine dimethylethanolamine, dimethylaminohexanol, dimethylaminoethoxyethanol, diazabicycloundecene and the like.
Examples of the organometallic-containing catalyst include bismuth octoate, lead octoate, tin (II) 2-ethylhexanoate, dibutyl bis (octanoyloxy) stannane, dibutyl tin diacetate, and dibutyl tin dilaurate.
Examples of the amine catalyst include TEDA-L33, TOYOCAT-ET, TOYOCAT-MR, TOYOCAT-TE, TOYOCAT-DT, TOYOCAT-NP, RX-5, RX-10, TOYOCAT-DM70, DABCO 33LV、DABCO BL-19、DABCO BL-11、DABCO DMEA、DABCO T、DABCO N-MM、DABCO N-EM、DABCO XDM、DABCO NC-IM、Polycat201、Polycat204、 flower king KAOLIZER NO.1、KAOLIZER NO.3、KAOLIZER NO.10、KAOLIZERNO.31、KAOLIZER NO.21、KAOLIZER NO.22、KAOLIZER NO.25、KAOLIZER NO.26、KAOLIZER NO.120、KAOLIZER NO.300、KAOLIZERNO.350、KAOLIZER NO.390, evonik, etc. manufactured by TOSOH CORPORATION.
One or two or more of these catalysts may be used.
Examples
<1> Test conditions
The following test was performed on a foam formed from the polyurethane resin composition of the present invention. A detailed description of each material is as follows.
(1) Polyol compounds
Terephthalic acid polyester polyol (AIR WATER MATERIALS INC. Manufactured, product name: MAXIMOL RFK-505, hydroxyl value=250 mgKOH/g)
(2) Foam stabilizer
Organosilicon foam stabilizer (product name: L-6900 manufactured by Momentive)
(3) Surface conditioner
Acrylic Polymer (Nanyuji Chemie, product name: SEI-W01)
(4) Catalyst
D1 amine catalyst (product name: DABCO 2040 manufactured by Evonik)
D2 amine catalyst (product name: polycat201 manufactured by Evonik)
D3 organometallic catalyst (SHEPHERD, product name: bicat 8210)
(5) Trimerization catalyst
E1 quaternary ammonium salt (Evonik product, product name: TMR-7)
E2:Potassium acetate catalyst (product name: polycat46, manufactured by Evonik)
(6) Mineral-derived materials
Calcined kaolin (IMERYS MINERALS company, product name: glomax LL)
(7) Flame retardant
G1 red phosphorus (product name: nova Excel 140, manufactured by phosphorus chemical Co., ltd.)
G2 ammonium polyphosphate (product name: TAIEN CII, manufactured by Taiping chemical industry Co., ltd.)
G3 phosphate (Wansheng product, product name: TCPP)
(8) Foaming agent
H1 HFO-1233zd (Honeywell International Inc. manufactured by Mitsui. Product name: solstice LBA)
H2 HFO-1336mzz (The Chemours Company manufactured by Miq. Product name: opteon 1100)
H3 Water (hydroxyl value=6234 mgKOH/g)
(9) Polyisocyanates
I Polymeric MDI (TOSOH CORPORATION manufactured, product name: milionate MR-200NCO content=31%)
<2> Method for producing test piece
According to the compounding of the tables of the respective figures, the polyol, catalyst, trimerization catalyst, flame retardant, blowing agent, surface conditioner, foam stabilizer components were weighed into a 1000mL polypropylene beaker and stirred.
The above-described mixture was referred to as a polyol premix.
The polyol premix and isocyanate were tempered to 5 ℃.
For the temperature-regulated polyol premix composition, the isocyanate composition was added according to the compounding of the table of the figures. After stirring for about 3 seconds with a manual mixer, the mixture was rapidly poured into a 200X 200mm wooden box which was heated to 20℃to obtain a foam. (since the polyol premix component contains the powder, the powder is stirred and dispersed in advance immediately before the isocyanate component is mixed.)
The foam cured for 24 hours after foaming was cut into dimensions of 99 mm. Times.99 mm. Times.50 mm, and after measuring the mass (the foam density was calculated from the obtained mass and dimensions), a cone-shaped calorimetric test body was produced. (the test piece was cut to a height of 50mm in the foaming direction.)
<3> Test content
In the exothermic test according to the test method of ISO-5660, the total heat release amount (10 minutes heating time and 20 minutes heating time), the maximum heat release rate, the time exceeding 200kW/m2 (the time when the maximum heat release rate continuously exceeds 200kW/m2), the maximum expansion length (height direction) of the test piece, the presence or absence of spark contact, and the like were evaluated by setting the heating time to 20 minutes at the radiant heat intensity of 50kW/m2.
The test apparatus used in the present test is described in detail below.
Manufactured by Toyo Seisakusho machine, product name: cone calorimeter model: C4
Isolation length of the test body from the spark plug of 12.5mm
<4> Test results
The description will be made with reference to the drawings of the comparative examples, which are drawn from the results of all the tests.
(1) For experimental examples 1, 2 (Table 3)
[ Case of containing either foam stabilizer or surface conditioner ]
In experimental examples 1 and 2 (table 3), the foam stabilizer and the surface conditioner were blended.
TABLE 3
Any of the test bodies formed a result of spark contact.
(2) For experimental example 3 to 21 (Table 4 to Table 7)
[ Case of changing the amount of kaolinite blended ]
In experimental examples 3 to 21 (tables 4 to 7), the blending amount of kaolinite was changed from 0 to 100 parts by weight without containing a foam stabilizer or a surface modifier.
TABLE 4
TABLE 5
TABLE 6
TABLE 7
For any of the test pieces, the maximum expansion length was 2mm or less, and no spark contact was generated.
In experimental examples 3, 4, 20 and 21, the non-combustible material was used, and in experimental examples 5 to 19 (the mixing amount of kaolinite was 15 to 85 parts by weight), the non-combustible material was used.
In the test pieces of examples 4 to 21 (the mixing amount of kaolinite is 10 parts by weight to 100 parts by weight), the foam density was 30kg/m3 or more.
(3) For experimental examples 22-32 (Table 8-Table 10)
[ Case of changing the blending amount of flame retardant ]
In experimental examples 22 to 32 (tables 8 to 10), the blending amount of the flame retardant was changed by fixing the blending amount of kaolinite to 25 parts by weight without containing the foam stabilizer and the surface modifier.
TABLE 8
TABLE 9
TABLE 10
For any of the test pieces, the maximum expansion length was 2mm or less, and no spark contact was generated.
In the test pieces of examples 23 to 26 and examples 29 to 32, the foam density was 30kg/m3 or more, which corresponds to the nonflammable material.
(4) For experimental examples 33 to 40 (Table 11, table 12)
[ Case of changing the amount of the blowing agent to be blended ]
In experimental examples 33 to 40 (tables 11 and 12), the blending amount of each foaming agent was changed while the blending amount of kaolinite was set to 0 part by weight, 25 parts by weight, 50 parts by weight, 75 parts by weight, without containing a foam stabilizer or a surface modifier.
TABLE 11
TABLE 12
For any of the test pieces, the maximum expansion length was 2mm or less, and no spark contact was generated.
In addition, examples 33 and 40 correspond to the quasi-incombustible materials, and examples 34 to 39 correspond to the incombustible materials.
In addition, the foam density was 30kg/m3 or more for any of the test pieces.