JP2020100754A - Mite-proof polyurethane foam - Google Patents

Abstract

To provide a mite-proof polyurethane foam, which exerts an excellent mite-proofing effect over a long period of time and is suitable for bedding (pillows, mattresses), cushions, chair pads, clothing pads, wearable mite-proofing equipment, toys, vehicle seats cushions and the like.SOLUTION: There is provided a mite-proof polyurethane foam obtained from a mite-proof polyurethane foam composition containing a polyol, an isocyanate, a foaming agent, a catalyst, a foam stabilizer and a mite -proofing agent. The mite -proofing agent comprises boric acid-based glass powder. The boric acid-based glass powder has a particle size (D50%) of 1 to 20 μm. The addition rate of the boric acid-based glass powder in the mite-proof polyurethane foam composition is 0.5 to 5%. The mite-proof polyurethane foam is characterized in that the number of cells is 20 to 60 cells/25 mm.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tick-proof polyurethane foam.

Polyurethane foam is widely used for mattresses, cushion materials for sofas, vehicle seat cushions, and the like.
Some polyurethane foams contain a mites repellent composed of an organic component in order to prevent the reproduction of mites (Patent Document 1).
There is also a polyurethane foam containing boric acid glass powder (Patent Document 2).

JP, 10-120895, A Japanese Patent Publication No. 6-94408

However, the toluamide compounds, organic acid ester compounds, and pyrethroid compounds that are used as mite repellents composed of organic components have the effect of keeping mites away from the volatile components (tick repellent), so that they are repelled on the surface of polyurethane foam. The effect is obtained. However, since the humidity inside the polyurethane foam increases during use, mites are more likely to propagate inside the polyurethane foam.

On the other hand, polyurethane foam containing only boric acid-based glass powder provides a tick-proofing effect for a longer period of time than a mite repellent consisting of organic components, but mites that enter and propagate inside the polyurethane foam There are problems that cannot be fully prevented.

The present invention has been made in view of the above points, and an object thereof is to provide a mite-proof polyurethane foam that has an excellent mite-proof effect over a long period of time.

The invention according to claim 1 is a mite-proof polyurethane foam obtained from a composition for mite-proof polyurethane foam containing a polyol, an isocyanate, a foaming agent, a catalyst, a foam stabilizer and a mite-proofing agent, wherein the mite-proofing agent is The boric acid-based glass powder has a particle diameter (D50%) of 1 to 20 μm, and the addition rate of the boric acid-based glass powder in the composition for anti-mite polyurethane foam is 0.3 to 10. 5%, and the mite-proof polyurethane foam has a cell number of 20 to 60 cells/25 mm.

The invention of claim 2 is characterized in that, in claim 1, the mite-proof polyurethane foam has an air permeability of 10 to 200 L/min.

According to the present invention, the mite-preventing agent contained in the mite-proof polyurethane foam is boric acid-based glass powder, and the boric acid-based glass powder has a particle size (D50%) of 1 to 20 μm. By setting the addition rate of the boric acid-based glass powder in 0.3 to 5%, the mite-proof polyurethane foam has excellent mite-proof property.

Furthermore, by reducing the cell size by setting the number of cells of the mite-proof polyurethane foam to 20 to 60 cells/25 mm, it becomes difficult for mites to pass through the cells of the mite-proof polyurethane foam, and external mites prevent mite-proof polyurethane foam. It is possible to suppress the invasion of the inside of the plant to reproduce, and it is possible to exhibit excellent anti-mite property.

It is a table which shows the structure of an Example and a comparative example, a physical-property measurement result, and a mites prevention test result.

The mite-proof polyurethane foam of the present invention is obtained by a reaction of a polyol and an isocyanate from a mite-proof polyurethane foam composition containing a polyol, an isocyanate, a foaming agent, a catalyst, a foam stabilizer and a mite-proofing agent. , Has an open cell structure.

As the polyol, a polyol for polyurethane foam is used, and it is not particularly limited, and may be any of polyether polyol, polyester polyol, and polyether ester polyol, and one kind or plural kinds thereof may be used. ..

Examples of the polyether polyol include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, sucrose, and other polyhydric alcohols such as ethylene oxide (EO). ), propylene oxide (PO) and other alkylene oxide-added polyether polyols.

Examples of polyester polyols include polycondensation of aliphatic carboxylic acids such as malonic acid, succinic acid, and adipic acid, and aromatic carboxylic acids such as phthalic acid, and aliphatic glycols such as ethylene glycol, diethylene glycol, and propylene glycol. The polyester polyol thus obtained can be mentioned.
Examples of the polyether ester polyol include those obtained by reacting the above polyether polyol with a polybasic acid to form a polyester, or those having both segments of polyether and polyester in one molecule.

As the isocyanate, an aliphatic or aromatic polyisocyanate having two or more isocyanate groups, a mixture thereof, and a modified polyisocyanate obtained by modifying them can be used. Examples of the aliphatic polyisocyanate include hexamethylene diisocyanate, isophorone diisocyanate and dicyclohexamethane diisocyanate, and examples of the aromatic polyisocyanate include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate and xylyl. Diisocyanate, polymeric polyisocyanate (crude MDI) and the like can be mentioned. Other prepolymers can also be used.

The isocyanate index (INDEX) is preferably 80 or more, more preferably 85 to 120. The isocyanate index is a value obtained by dividing the number of moles of isocyanate groups in isocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups of polyol and multiplying by 100, and [NCO equivalent of isocyanate/active hydrogen equivalent×100] Calculated.

As the foaming agent, water, hydrocarbon alternatives such as chlorofluorocarbon or pentane can be used alone or in combination. In the case of water, carbon dioxide gas is generated during the reaction between the polyol and the isocyanate, and the carbon dioxide gas causes foaming. The amount of water as a foaming agent is preferably 0 to 10 parts by weight with respect to 100 parts by weight of the polyol.

As the catalyst, a known polyurethane-forming catalyst can be used in combination. For example, amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine and tetramethylguanidine, tin catalysts such as stannas octoate and dibutyltin dilaurate, phenyl mercury propionate or lead octenoate. And other metal catalysts (also referred to as organometallic catalysts).

As the foam stabilizer, those known for polyurethane foam can be used. Examples thereof include silicone type foam stabilizers, fluorine-containing compound type foam stabilizers and known surfactants. The amount of the foam stabilizer is 0.6 to 3.0 parts by weight based on 100 parts by weight of the polyol.

Boric acid-based glass powder is used as an anti-mitic agent. The boric acid glass powder is obtained by supporting boric anhydride on glass particles.
Regarding the particle size of the boric acid-based glass powder, the median diameter D50% is preferably 1 to 20 μm, and more preferably D50% is 5 to 20 μm. When the particle diameter (D98%) at 98% of the cumulative particle diameter distribution curve is the maximum particle diameter, the maximum particle diameter D98% is preferably 1 to 50 μm, more preferably D98% is 10 to 50 μm.
By controlling the particle size of the boric acid diameter glass powder within the above range, the effect of preventing mites becomes better. In particular, when D50% having a large particle diameter is 5 to 20 μm, the effect of preventing mites becomes better.

Regarding the amount of the boric acid glass powder, it is preferable that the addition rate of the boric acid glass powder in the mite-proof polyurethane foam composition is 0.3 to 5%. If the addition rate of the mite-proofing agent is low, the mite-proofing property is lowered, while if the addition rate of the mite-proofing agent is too high, good foaming of the polyurethane foam is impaired.

In addition, the mite-proof polyurethane foam composition appropriately contains other auxiliary agents. For example, a flame retardant, a coloring agent, etc. can be mentioned.
Flame retardants include polyvinyl chloride, chloroprene rubber, halogenated polymers such as chlorinated polyethylene, phosphoric acid ester and halogenated phosphoric acid ester compounds, organic flame retardants such as melamine resin and urea resin, antimony oxide and aluminum hydroxide. Inorganic flame retardants and the like can be mentioned. When the flame retardant is used, the compounding amount is 5 to 50 parts by weight with respect to 100 parts by weight of the polyol.
Carbon black etc. can be mentioned as a coloring agent. The blending amount of the colorant is determined according to the type of colorant.

The mite-proof polyurethane foam is produced by reacting the polyol and isocyanate of the composition for mite-proof polyurethane foam to foam.
The foaming in the method for producing the mite-proof polyurethane foam may be either slab foaming or mold foaming. Slab foaming is a method in which a mixed mite-proof polyurethane foam composition (polyurethane foam raw material) is discharged onto a belt conveyor and foamed at room temperature under atmospheric pressure, while mold foaming is mixed mite-proof This is a method in which a mold (molding die) is filled with the composition for polyurethane foam and foamed in the mold.

The article in which the tick-proof polyurethane foam of the present invention is used is not limited, and is suitable for a thing to be worn, a thing to be put by, or the like. Examples thereof include bedding (pillows and mattresses), cushions, chair pads, clothing pads, wearable mites, toys, and vehicle seat cushions.

The mite-proof polyurethane foam of the present invention preferably has a cell number (JISK6400-1 Annex 1) of 20 to 60 cells/25 mm.
The smaller the number of mite-proof polyurethane foam cells, the larger the cell size of mite-proof polyurethane foam and increase the air permeability. Conversely, the larger the number of cells, the smaller the cell size of mite-proof polyurethane foam. Becomes less breathable.

If the number of cells of the mite-proof polyurethane foam is too small (cell diameter is too large), mites easily enter the inside of the mite-proof polyurethane foam from the outside through the cells of the mite-proof polyurethane foam. The mites that have penetrated into the inside propagate inside the mite-proof polyurethane foam and have a low mite-proof property.

On the other hand, when the number of cells of the mite-proof polyurethane foam is too large (the cell diameter is small), the mite-proof polyurethane foam has too low air permeability and tends to be stuffy.
By controlling the number of cells of the mite-proof polyurethane foam within the above range, it is possible to suppress the invasion of mite from the outside into the mite-proof polyurethane foam and improve the mite-proof property. It helps prevent stuffiness and makes it easier to use. In the range of the number of cells, the larger the number of cells (the smaller the cell diameter), the higher the tick-proofing property.

The breathability of the mite-proof polyurethane foam is preferably 10 to 200 L/min. If the mite-proof polyurethane foam has too low air permeability, the inside of the mite-proof polyurethane foam tends to be stuffy, and mites once invading the mite-proof polyurethane foam may easily propagate.

On the other hand, when the mite-proof polyurethane foam has too high air permeability, the cell diameter becomes large and mites easily enter.
If the number of cells of the mite-proof polyurethane foam is in the above range, and if the air permeability is in the above range, it is possible to suppress the stuffiness inside the mite-proof polyurethane foam to improve the mite-proof property and make the feeling of use comfortable. You can

The density (JIS K 7222) of the mite-proof polyurethane foam is appropriately determined depending on the product application of the mite-proof polyurethane foam. For example, 20 to 60 kg/cm ³ is given as an example of the density when the application is a mattress or a cushion material for a sofa.

The following raw materials were mixed in the composition shown in FIG. 1 and reacted and foamed to produce polyurethane foams of Examples and Comparative Examples.
-Polyol: polyether polyol, number average molecular weight 3000, functional group number 3, hydroxyl value 56.1 mgKOH/g, product number; GP-3000, manufactured by Sanyo Chemical Industry Co., Ltd.-Blowing agent: water-amine catalyst: triethylenediamine 33%, di Propylene glycol 66% solution, product number; DABCO 33LV, manufactured by Evonik.
・Metal catalyst: stannous octylate, product number; MRH110, manufactured by Johoku Chemical Industry Co., Ltd. ・Foam stabilizer: silicone-based foam stabilizer, product number: L-595, manufactured by Momentive Performance Materials Japan, Inc. Mite agent A-1: boric acid-based glass powder, particle size D50%; 2.9 μm, D98%; 6.7 μm, manufactured by Ishizuka Glass Co., Ltd.-Acaricide A-2: boric acid-based glass powder, particle size D50%; 12 .7 μm, D98%; 36.1 μm, manufactured by Ishizuka Glass Co., Ltd.-Acaricide B: Pyrethroid-based mite inhibitor, manufactured by Daiwa Chemical Co., Ltd.-Isocyanate: Mixture of 80% 2,4-TDI and 20% 2,6-TDI, product number Coronate T-80, manufactured by Nippon Polyurethane Industry Co., Ltd.

The addition rate (%) of the mite-preventive agent in FIG. 1 can be calculated by the formula of [amount of addition of mite-preventive agent/total amount of compound×100].

With respect to the obtained Examples 1 to 6 and Comparative Examples 1 to 3, as the physical properties, the density (kg/m ³ ) of the polyurethane foam, the 25% ILD hardness (N), the number of cells (cells/25 mm), and the air permeability ( L/min), and a mite growth inhibition test was performed as a mite prevention test.

The density is JIS K7222, the 25% ILD hardness is JIS K6200-2, the tensile strength is JIS K6400-5, the elongation is JIS K6400-5, the number of cells is JIS JISK6400-1 Annex 1, the air permeability is JIS K6400-7( It was measured based on Method A).

The mite growth inhibition test was performed by the medium contact method (based on JIS L1920). The medium contact method is to put a specimen (polyurethane foam) having a diameter of 4 cm and a thickness of 1 cm into a petri dish having a diameter of 4.5 cm, and uniformly disperse 0.1 g of a medium containing 60 mites on the specimen, and the petri dish at 25° C. Leave to stand in the dark at 75% RH. For those left for 4 weeks and those left for 6 weeks, the mites were washed out, and the number of mites that survive under the microscope (live mites) was counted, and the proliferation rate (%) after 4 weeks and 6 weeks The growth inhibition rate (%) after standing for 4 weeks and after standing for 6 weeks was calculated by the following formula. In addition, the used mites are mosquito leopard mites. As the samples, a mite-preventing agent-added polyurethane foam (Examples and Comparative Examples) and a mite-preventing agent-free polyurethane foam were used, and a mite growth inhibition test was performed on each sample.
Proliferation rate (%)=[(the number of live mites after the test-the number of mites at the start of the test (60))/the number of mites at the start of the test (60)]×100
Growth inhibition rate (%)=[1-(number of live mites in mite-preventive agent-added polyurethane foam/number of live mite in mite-preventive agent-free polyurethane foam)]×100

In addition, the number of living mites (the number of living mites), the growth rate, and the growth inhibition rate were evaluated after leaving for 4 weeks and after leaving for 6 weeks. From the results after leaving for 4 weeks and after leaving for 6 weeks A comprehensive evaluation (tick growth inhibitory effect) was performed.
The evaluation for the number of live mites after being left for 4 weeks is "◎" when the number of live mites is less than 60, "○" when the number of live mites is 60 or more and less than 120, and "120" or more but less than 240 "△", "240" when 240 or more.
The evaluation of the growth rate after standing for 4 weeks is “A” when the growth rate is less than 10%, “◯” when the growth rate is 10% or more and less than 100%, and “△” when 100% or more and less than 250%. "," when it was 250% or more.
The evaluation of the growth inhibition rate after standing for 4 weeks is “◎” when the growth inhibition rate is 80% or more, “◯” when the growth inhibition rate is 60% or more and less than 80%, and when 40% or more and less than 60%. “A”, and when less than 40%, “X”.

The evaluation for the number of live mites after being left for 6 weeks is “◎” when the number of live mites is less than 120, “◯” when the number of live mites is 120 or more and less than 240, and “240” or more and less than 360. “A”, when there were 360 or more animals, “A” was given.
The evaluation of the growth rate after standing for 6 weeks is “◎” when the growth rate is less than 100%, “◯” when the growth rate is 100% or more and less than 300%, and “△” when 300% or more and less than 500%. “,” when it was 500% or more.
The evaluation of the growth inhibition rate after standing for 6 weeks is “◎” when the growth inhibition rate is 80% or more, “◯” when the growth inhibition rate is 60% or more and less than 80%, and when 40% or more and less than 60%. “A”, and when less than 40%, “X”.

The comprehensive evaluation (tick growth inhibitory effect) is evaluated as follows. When each evaluation (evaluation for the number of live mites, evaluation of the growth rate, evaluation of the growth inhibition rate) in the tick prevention test result is all "◎", the overall evaluation (tick growth inhibition effect) is "◎", the tick prevention test result Each evaluation in "○" is more than "○", and even if there is at least one "○", the overall evaluation (mite growth inhibitory effect) is "○", and each evaluation in the tick prevention test result is "△" or more. If there is at least one "△", the overall evaluation (tick growth inhibitory effect) is "△", and if there is at least one "x" in each evaluation in the tick prevention test results, then the overall evaluation ( The effect of suppressing mite growth) was defined as "x".

In Example 1, 100 parts by weight of polyol, 3.8 parts by weight of foaming agent, 0.1 parts by weight of amine catalyst, 0.23 parts by weight of metal catalyst, 1.0 part by weight of foam stabilizer, and acaricide. Agent A-1 0.8 parts by weight, isocyanate 47.8 parts by weight, total compounding ingredients 153.7 parts by weight, isocyanate index 105, mite-preventive agent addition rate 0.5% A foam composition was used.

Example 1 is an example in which the anti-mite agent A-1 was used, and the addition rate of the anti-mite agent A-1 was 0.5%, and the physical properties were a density of 28.0 kg/m ³ , 25% ILD. The hardness was 150 N, the number of cells was 36 cells/25 mm, and the air permeability was 110 L/min. The result of the tick prevention test is 98 living mites after leaving for 4 weeks, evaluation "○", growth rate after leaving for 4 weeks 63%, evaluation "○", growth inhibition rate after leaving for 4 weeks 75%, evaluation " ◯, 227 live mites after 6 weeks left, evaluation “◯”, growth rate after left for 6 weeks 278%, evaluation “○”, growth suppression rate after left for 6 weeks 85%, evaluation “◎”, The overall evaluation (effect of suppressing tick growth) was “◯”. In Example 1, the comprehensive evaluation (mite growth inhibitory effect) was “◯”, and the mite growth inhibitory effect was good.

In Example 2, 0.25 parts by weight of the metal catalyst, 1.6 parts by weight of the mite-preventive agent A-1, the total amount of the blended raw materials was 154.6 parts by weight, and the addition rate of the anti-mite agent was 1.0%. Used a mite-proof polyurethane foam composition having the same composition as in Example 1.

Example 2 is an example in which the amount of the anti-mite agent A-1 was increased and the addition rate of the anti-mite agent A-1 was 1.0%, and the physical property values were a density of 28.2 kg/m ³ and 25% ILD. The hardness was 147 N, the number of cells was 36 cells/25 mm, and the air permeability was 115 L/min. The result of the tick-proof test is 43 living mites after leaving for 4 weeks, evaluation "◎", proliferation rate after leaving for 4 weeks -28%, evaluation "◎", growth inhibition rate after leaving for 4 weeks 89%, evaluation "A", 21 live mites after 6 weeks, evaluation "A", proliferation rate after 6 weeks -65%, evaluation "A", proliferation inhibition rate after 6 weeks 99%, evaluation "A"", and a comprehensive evaluation (tick growth inhibitory effect) was "A". In Example 2, by increasing the addition rate of the mite-preventive agent A-1 to 1.0% compared to 0.5% in Example 1, the mite-proof property is better than that of Example 1. The evaluation (mite growth inhibitory effect) was "A", indicating that the mite growth inhibitory effect was good.

In Example 3, 0.27 parts by weight of the metal catalyst, 4.6 parts by weight of the mite-preventing agent A-1, the total amount of the blended raw materials of 157.6 parts by weight, and the addition rate of the anti-mite agent of 3.0% were used. Used a mite-proof polyurethane foam composition having the same composition as in Example 1.

Example 3 is an example in which the amount of the mite-preventing agent A-1 was increased and the addition rate of the mite-preventing agent A-1 was 3.0%, and the physical property values were a density of 28.6 kg/m ³ and 25% ILD. The hardness was 137 N, the number of cells was 34 cells/25 mm, and the air permeability was 165 L/min. The result of the tick-proof test is 43 living mites after leaving for 4 weeks, evaluation "◎", proliferation rate after leaving for 4 weeks -28%, evaluation "◎", growth inhibition rate after leaving for 4 weeks 89%, evaluation "A", 21 live mites after 6 weeks, evaluation "A", proliferation rate after 6 weeks -65%, evaluation "A", proliferation inhibition rate after 6 weeks 99%, evaluation "A"", and a comprehensive evaluation (tick growth inhibitory effect) was "A". In Example 3, by increasing the addition rate of the anti-mite agent A-1 to 3.0% as compared to 0.5% in Example 1, the anti-mite property was better than that of Example 1. The comprehensive evaluation (mite growth inhibitory effect) is “⊚”, and the mite growth inhibitory effect is good.

In Example 4, 2.6 parts by weight of a foaming agent, 0.2 part by weight of an amine catalyst, 0.35 part by weight of a metal catalyst, 0.75 part by weight of an anti-mite agent A-1, and 37.6 part of an isocyanate. Parts by weight, the total amount of raw materials to be mixed is 142.5 parts by weight, the isocyanate index 110 is 110%, and the addition ratio of anti-mite agent is 0.5%. Other than that, the composition for mite-proof polyurethane foam is the same as in Example 1 did.

In Example 4, the compounding amounts of the foaming agent, mite-preventing agent A-1 and isocyanate were reduced from those in Example 1, and the amounts of the amine catalyst, the metal catalyst and the isocyanate index were increased from those in Example 1, and the mite-proof polyurethane foam was obtained. Is an example of increasing the number of cells (reducing the cell diameter), and the physical properties are as follows: density 37.0 kg/m ³ , 25% ILD hardness 150 N, number of cells 46/25 mm, air permeability 75 L/min. there were. The result of the tick prevention test is 64 living mites after leaving for 4 weeks, evaluation "○", growth rate after leaving for 4 weeks 7%, evaluation "◎", growth inhibition rate after leaving for 4 weeks 63%, evaluation " ◯”, 51 live mites after 6 weeks, evaluation “◎”, growth rate after 6 weeks −15%, evaluation “◎”, growth inhibition rate after 6 weeks 95%, evaluation “◎” The comprehensive evaluation (effect of suppressing tick growth) was “◯”. In Example 4, since the number of cells was increased (the cell diameter was smaller) than in Example 1, the proliferation rate after leaving for 4 weeks and 6 weeks was smaller and the proliferation inhibiting rate was higher than that in Example 1. Therefore, the effect of suppressing the growth of mites is better than that of Example 1.

Example 5 is a composition for mite-proof polyurethane foam, which has the same amount of mite-proofing agent A-2 as Example 4 but uses the same amount of mite-proofing agent A-2 as in Example 4. used.

Example 5 is an example in which the anti-miticidal agent A-2 is used, and the physical properties are as follows: density 36.8 kg/m ³ , 25% ILD hardness 155 N, number of cells 46/25 mm, air permeability 66 L/min. there were. The result of the tick prevention test is 34 living mites after leaving for 4 weeks, evaluation “◎”, growth rate after leaving for 4 weeks −43%, evaluation “◎”, growth inhibition rate after leaving for 4 weeks 80%, evaluation "A", 30 live mites after 6 weeks, evaluation "A", proliferation rate after 6 weeks -50%, evaluation "A", proliferation inhibition rate after 6 weeks 97%, evaluation "A"", and a comprehensive evaluation (tick growth inhibitory effect) was "A". Example 5 is a mite-preventing agent A-2 (boric acid-based glass) in place of the mite-preventing agent A-1 (boric acid-based glass powder, particle size D50%; 2.9 μm, D98%; 8 μm or less) of Example 4. Powder, particle size D50%; 12.7 μm, D98%; 40 μm or less), the proliferation rate after leaving for 4 weeks and 6 weeks and smaller than Example 4 and the growth inhibiting rate increased. The effect of suppressing the growth of mites is better than that of Example 4.

Example 6 was the same as Example 5 except that the mite preventive agent A-2 in Example 5 was 1.4 parts by weight, the total amount of the blended raw materials was 143.2 parts by weight, and the mite inhibitor addition rate was 1%. A composition for mite-proof polyurethane foam composed of the compound was used.

Example 6 is an example in which the compounding amount of the acaricide A-2 was increased more than that of Example 5, and the physical properties were as follows: density 37.2 kg/m ³ , 25% ILD hardness 158 N, cell number 45. The air permeability was /25 mm and the air permeability was 67 L/min. The result of the tick prevention test is 12 living mites after 4 weeks of standing, evaluation "◎", growth rate after leaving for 4 weeks -80%, evaluation "◎", growth inhibition rate after standing for 4 weeks 93%, evaluation "A", 17 live mites after 6 weeks, evaluation "A", growth rate after 6 weeks -72%, evaluation "A", growth inhibition rate after 6 weeks 98%, evaluation "A"", and a comprehensive evaluation (tick growth inhibitory effect) was "A". In Example 6, by increasing the addition rate of the mite-preventing agent A-2 of Example 5, the mite-proofing property was better than that of Example 5, and the overall evaluation (mite growth-suppressing effect) was “◎”. Therefore, the effect of suppressing the growth of mites is better than that of Example 5.

Comparative Example 1 was the same as Example 1 except that the mite-preventing agent A-1 in Example 1 was not mixed, the total amount of blended raw materials was 152.9 parts by weight, and the addition rate of the anti-mite agent was 0.0%. A composition for mite-proof polyurethane foam composed of the compound was used.

Comparative Example 1 is an example in which a tick-proofing agent was not mixed, and the physical properties were a density of 27.8 kg/m ³ , a 25% ILD hardness of 154 N, a cell number of 38 cells/25 mm, and an air permeability of 102 L/min. The tick-proof test result is 391 live mites after leaving for 4 weeks, evaluation "x", proliferation rate 552% after leaving for 4 weeks, evaluation "x", number of living mites after standing for 6 weeks, 1479, evaluation " “×”, the proliferation rate after standing for 6 weeks was 2365%, the evaluation was “×”, and the comprehensive evaluation (tick proliferation inhibitory effect) was “×”. In Comparative Example 1, no mite-proofing agent was obtained because no mite-proofing agent was added.

Comparative Example 2 is a mite-preventing agent B (pyrroidoid-type mite-proofing agent) in place of the mite-preventing agent A-1 (boric acid-based glass powder, particle size D50%; 2.9 μm, D98%; 8 μm or less) in Example 3. Agent) was blended in an amount of 4.6 parts by weight, and the other composition was the same as in Example 3 except that the composition for anti-mite polyurethane foam was used.

Comparative Example 2 is an example in which a pyrethroid anti-mite agent B is blended, and the physical property values are a density of 28.5 kg/m ³ , a 25% ILD hardness of 144 N, a cell number of 36 cells/25 mm, and an air permeability of 110 L/min. Met. The result of the tick prevention test is 236 live mites after leaving for 4 weeks, evaluation "△", growth rate after leaving for 4 weeks 293%, evaluation "x", growth inhibition rate after leaving for 4 weeks 40%, evaluation " △, 885 live mites after 6 weeks, evaluation "x", growth rate 14% after 6 weeks, evaluation "x", growth inhibition rate 40% after 6 weeks, evaluation "△", The overall evaluation (tick growth inhibitory effect) was “x”. Comparative Example 2 is a comprehensive evaluation (tick growth inhibitory effect) “x”, although the mite-preventing effect can be obtained by incorporating the pyrethroid-based mite-preventing agent, and is from Examples 1 to 6 made of boric acid-based glass powder. Also has a low effect of preventing ticks.

In Comparative Example 3, 100 parts by weight of polyol, 2.6 parts by weight of foaming agent, 0.2 parts by weight of amine catalyst, 0.35 parts by weight of metal catalyst, 1.0 part by weight of foam stabilizer, and acaricide A composition for mite-proof polyurethane foam having 37.6 parts by weight of isocyanate, 141.8 parts by weight of total raw materials, an isocyanate index of 110, and a mite-proofing agent addition rate of 0.0% without compounding agent. used.

Comparative Example 3 is an example in which the number of cells is reduced (larger cell diameter) than in Comparative Example 1 by changing the blowing agent, amine catalyst, metal catalyst, isocyanate compounding amount, and isocyanate index from Comparative Example 1. The physical properties were a density of 36.6 kg/m ³ , 25% ILD hardness of 153 N, cell number of 46 cells/25 mm, and air permeability of 66 L/min. The result of the tick prevention test is 172 live mites after leaving for 4 weeks, evaluation "△", proliferation rate 187% after leaving for 4 weeks, evaluation "△", number of living ticks after leaving for 6 weeks 980, evaluation " “×”, the proliferation rate after standing for 6 weeks was 1533%, the evaluation was “×”, and the overall evaluation (tick proliferation inhibitory effect) was “×”. In Comparative Example 3, the number of cells was decreased (the cell diameter was made larger) than in Comparative Example 1, so that it was found that the mites-preventing property after leaving for 4 weeks and after 6 weeks was better than that of Comparative Example 1. ..

As described above, the mite-proof polyurethane foam of the present invention has an excellent mite-proof effect over a long period of time, and bedding (pillows, mattresses), cushions, chair pads, clothing pads, and wearing protection. It is suitable for mite products, toys, and vehicle seat cushions.

Claims (2)

A mite-proof polyurethane foam obtained from a composition for mite-proof polyurethane foam containing a polyol, an isocyanate, a foaming agent, a catalyst, a foam stabilizer and a mite-proofing agent,
The anti-mitic agent consists of boric acid glass powder,
The boric acid-based glass powder has a particle size (D50%) of 1 to 20 μm,
The addition rate of the boric acid-based glass powder in the composition for mite-proof polyurethane foam is 0.3 to 5%,
The tick-proof polyurethane foam has a cell number of 20 to 60 cells/25 mm. The mite-proof polyurethane foam according to claim 1, wherein the mite-proof polyurethane foam has an air permeability of 10 to 200 L/min.

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