JPH0159104B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to construction materials, particularly waterproofing materials, paving materials, flooring materials, wall materials, or materials that can be used in combination with these materials. Various organic and inorganic compounds have traditionally been used for waterproofing materials, paving materials, flooring materials, wall materials, etc., but in recent years, improvements have been made in terms of elasticity, abrasion resistance, mechanical properties, workability, and economic efficiency. For these reasons, polyurethane resins have been used in large quantities. The quality of these materials, construction specifications, construction techniques, etc. have been improved through JIS, JASS, the certified technician system, etc., and the reality is that they are now being applied and contributing in a stable manner. In particular, due to the increased demand for sports facilities due to the recent increase in the number of people playing sports, the rooftops of structures, which previously only had the function of waterproofing materials, are now being used as paving materials for sports facilities that also serve as waterproofing materials. It is also required to satisfy the functions of flooring materials, etc. Naturally, waterproofing materials and paving materials have different functions and material properties. Waterproofing materials are required to follow the repeated movements of base cracks and joints in the substrate well, and to have excellent weather resistance and durability. On the other hand, paving materials are required to have excellent abrasion resistance, good appearance, smoothness, as well as shock absorption and dispersion properties. When attempting to obtain a material that combines both of these properties by applying existing polyurethane resins and construction methods, if emphasis is placed on the waterproof function, inserting reinforcing materials will impair smoothness, resulting in poor abrasion resistance and shock absorption. Sexuality, etc. becomes insufficient. In addition, if emphasis is placed on the paving material function, it becomes uneconomical due to thick coating, and the ability to follow cracks in the base is insufficient, making water leakage more likely. The present inventors have completed the present invention as a result of extensive research aimed at developing waterproofing materials, paving materials, flooring materials, wall materials, or materials that can be used in combination with these materials to solve the above-mentioned problems. This is what led to this. That is, in a construction material consisting of a polyurethane resin layer formed above and/or below a cushioning material, (A) the polyurethane resin layer is made of polyether polyol with an average molecular weight of 200 to 20,000, or polyester with an average molecular weight of 500 to 3,000. Surface hardness (composed of a hardening agent and a main ingredient containing a urethane prepolymer containing terminal isocyanate groups obtained by reacting an organic polyisocyanate compound with at least one polyol selected from polyols or polymer polyols with an average molecular weight of 1,000 to 40,000) (B) A polyurethane resin layer having a surface hardness of 15 to 90 obtained by moisture-curing a urethane prepolymer containing terminal isocyanate groups, and (B) the cushioning material is a string. A large number of organic foam materials,
A two-layer laminate consisting of layers arranged in parallel at regular intervals, such that the first layer of string-like organic foam material and the second layer of string-like organic foam material intersect at a certain angle. It is a construction material characterized by being laminated. The polyol used to form the polyurethane resin layer of the present invention has an average molecular weight of
Examples include at least one polyol selected from polyether polyols having an average molecular weight of 200 to 20,000, polyester polyols having an average molecular weight of 500 to 3,000, and polymer polyols having an average molecular weight of 1,000 to 40,000. Examples of polyether polyols include polyether polyols having an average molecular weight of 200 to 20,000, which are obtained by addition-reacting alkylene oxide to a compound having two or more active hydrogen groups. Active hydrogen group 2
Examples of compounds having 1 or more ions include water, propylene glycol, dipropylene glycol,
Tripropylene glycol, 1,4-butanediol, 1,3-butylene glycol, 1,6-hexanediol, pentaerythritol, glycerin, trimethylolpropane, castor oil, polybutane diene containing terminal hydroxyl groups, monoethanolamine, diethanolamine, Examples include triethanolamine and phosphoric acid. Examples of the alkylene oxide include ethylene oxide, propylene oxide, butylene oxide, styrene oxide, and tetrahydrofuran. Preferred examples include polyether polyols starting from compounds having 2 to 4 active hydrogen groups, having 2 to 4 terminal hydroxyl groups, and having an average molecular weight of 200 to 20,000. Next, examples of the polyester polyol include polyester polyols having an average molecular weight of 500 to 3,000, which are obtained by subjecting a polybasic acid and a polyhydric alcohol compound having two or more hydroxyl groups to a high-temperature dehydration reaction in the presence of a fermentation catalyst. Examples of polybasic acids include phthalic acid, adipic acid, and maleic acid; examples of polyhydric alcohol compounds having two or more hydroxyl groups include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, and trimethylolpropane. , glycerin, pentaerythritol and the like. Preferably, a polyester polyol having 2 to 3 terminal hydroxyl groups and an average molecular weight of 500 to 3,000 is used. Next, examples of the polymer polyol include polymer polyols having an average molecular weight of 1,000 to 40,000, which are obtained by polymerizing and grafting the above polyether polyol or the above polyester polyol with an ethylenically polymerizable unsaturated monomer. Examples of ethylenically polymerizable unsaturated monomers include cyan group-containing monomers such as acrylonitrile and methacrylonitrile, 2,4-dicyanobutene-1, styrene, and α-
Styrenic monomers such as methylstyrene and ethylstyrene, acrylic esters such as methyl acrylate, methacrylic esters such as methyl methacrylate, acrylic monomers such as acrylamide, diene monomers such as butadiene and isoprene, vinyl monomers, vinylidene monomers, fumar Examples include dimethyl acid, dimethyl maleate, olefin, etc., and preferably cyan group-containing monomers, styrene monomers, acrylonitrile such as acrylic monomers, styrene, etc.
Such a polymerization reaction between a polyol and an ethylenically unsaturated monomer can be carried out by, for example, adding a mixture of a polymerization initiator and an ethylenically unsaturated monomer to the polyol, or adding and mixing a polymerization initiator to the polyol in advance, and then adding ethylene to the polyol. Polymerization is carried out while adding a system unsaturated monomer. Examples of the polymerization initiator include peroxide-based, azo-based, and redox-based polymerization initiators or metal compound catalysts, and specifically, azobisisobutyronitrile (AINBN), benzoyl peroxide,
Examples include t-alkyl peroxy ester, acetyl peroxide, diisopropyl peroxy dicarbonate, and the like. Preferably, the average molecular weight is 1000 to 40000, the number of terminal hydroxyl groups is 2 to 8, and the number of terminal hydroxyl groups is 2/3 to 8.
Mention may be made of polymer polyols having a ratio of 100/0 to 50/50 and a grafted ethylenically polymerizable unsaturated monomer polymer content of 10 to 50%. Next, as an organic polyisocyanate compound,
For example, tolylene diisocyanate (TDI-80),
diphenylmethane diisocyanate, xylene diisocyanate, polyphenylpolymethylene polyisocyanate, naphthalene diisocyanate,
Examples include hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate (hydrogenated MDI), polyisocyanate adducts of lower alcohols, etc. alone or in mixtures. Next, examples of the urethane prepolymer containing terminal isocyanate groups include those obtained by reacting the above polyol with the above organic polyisocyanate compound. In the reaction between such a polyol and an organic polyisocyanate compound, the NCO/OH equivalent ratio is preferably 1.8 to 5, and the amount of free isocyanate in the urethane prepolymer containing terminal isocyanate groups is preferably 1.5 to 10% by weight. Next, as a curing agent to be reacted and cured with a main ingredient mainly composed of a urethane prepolymer containing terminal isocyanate groups, examples of the curing agent include the above-mentioned polyether polyol, the above-mentioned polyester polyol, the above-mentioned polymer polyol, hydroxyalkyl acrylate or hydroxymethyl acrylate, alkyl Acrylic polyol with an average molecular weight of 20,000 to 50,000 made by copolymerizing acrylate and methacrylic acid esters, and in some cases styrene and methacrylic acid, 4,4'methylenebis(2-chloroaniline) (MOCA), diaminodiph Examples include enylmethane alone or in mixtures. In the present invention, a so-called two-component type is used, in which a main component mainly composed of a urethane prepolymer containing terminal isocyanate groups is reacted with a curing agent, or a so-called one-component type, in which a urethane prepolymer containing terminal isocyanate groups is moisture-cured. If necessary, inorganic fillers, colorants,
Catalysts, plasticizers, other additives, etc. may also be blended. Examples of the inorganic filler include calcium carbonate, bentonite, calcium chloride, titanium oxide, and slaked lime. Examples of the coloring agent include carbon, chromium oxide green, red iron, and the like. Examples of the catalyst include organometallic compounds such as dibutyltin dilaurate, stannath octoate, dibutyltin diacetate, lead octylate, and lead naphthenate. Examples of the plasticizer include dioctyl phthalate (DOP), dibutyl phthalate, dioctyl adipate, and those obtained by blocking the hydroxyl groups of polypropylene glycol or polyethylene glycol with acetic acid. Other additives include, for example, liquid resin,
Examples include modifiers such as petroleum resins, antifoaming agents such as silicone, paraffin, and mineral oil, solvents such as ethyl acetate, toluene, and xylene, and antioxidants. The blending ratio of these inorganic fillers, colorants, catalysts, plasticizers, other additives, etc. is arbitrary. Next, examples of the string-like organic foam material forming the cushioning material include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyurethane, synthetic rubber, etc., and polyethylene, polystyrene, etc. are preferable. Furthermore, the shape of these string-like organic foam materials is
The interior is closed or open cells, and the expansion ratio is 1 to 50.
Preferably, it has a semi-circular longitudinal section. Here, the string-like shape includes all elongated shapes, and may be composed of, for example, a rod-like shape, a band-like shape, or the like. As a construction material of the present invention, a polyurethane resin layer having a surface hardness of 15 to 90 consisting of the above-mentioned main agent and a curing agent or a polyurethane resin layer having a surface hardness of 15 to 90 obtained by moisture-curing a urethane prepolymer containing a terminal isocyanate, and a polyurethane resin layer having a surface hardness of 15 to 90 made of the above-mentioned organic foam. Examples include those formed above and/or below a cushioning material made of a material. The selection and blending ratio of the main agent and curing agent for the polyurethane resin, or the selection and blending ratio of the terminal isocyanate-containing urethane prepolymer, etc., are appropriately selected within the range that satisfies the surface hardness of the resulting polyurethane resin layer of 15 to 90. It is something that will be done. If the surface hardness of the polyurethane resin layer falls outside of these ranges, the object of the present invention will not be achieved. The string-like organic foam material in the cushioning material may be different for the first and second layers, but usually the same material is used, and the string-like organic foam materials for the first and second layers are usually the same. It is preferable that they are joined at the points where they intersect. Note that the spacing between the string-like organic foam materials in each layer is arbitrary. Methods for manufacturing the construction materials of the present invention include the following methods. (b) A polyurethane resin layer is formed, string-like organic foam materials are arranged in parallel at predetermined intervals above the polyurethane resin layer, and above the string-like organic foam material, a string-like organic foam material similar to the above-mentioned string-like organic foam material is placed above the polyurethane resin layer. The string-like organic foam material is laid in parallel at a predetermined interval so as to intersect with the previous string-like organic foam material at a certain angle, or the string-like organic foam materials are intersected or arranged in the same manner as above, and then Lay out cushioning material with adhesive on the contact areas. Or (b) After performing the same method as in (a), further form a polyurethane resin layer above the cushioning material. Depending on the purpose or use, two or three or more layers may be formed by further laminating them above the material formed by combining the polyurethane resin and the cushioning material. The construction materials of the present invention (1) have high elasticity and excellent shock absorption effects; (2) have good exercise adaptability and walking feel; comfort and safety are ensured; and fewer injuries occur when falling. (3) Excellent heat retention and insulation effects; (4) Good followability to the base and movement; no cracks; (5) Mechanical properties, heat resistance, hot water resistance, chemical resistance;
It is highly durable and has excellent waterproofing and paving material functions. Therefore, it is most suitable as a waterproofing material, a paving material, an intermediate layer material such as a flooring material or a wall material, a surface finishing material, or a combination of these materials. Specifically, it can be used for indoor and outdoor courts for sports facilities, promenades, architectural floors, architectural walls, and the like. Next, the present invention will be explained with reference to Examples. In addition, "%" and "part" in the examples are based on weight. Production Example 1 Various polymer polyols were produced according to the following production method. A portion of the raw material polyol shown in Table 1 (initial charged amount) was charged in advance into a 3-capacity autoclave, and after repeated vacuum nitrogen purging, the remaining raw material polyol (additional charged amount) and ethylenically polymerizable unsaturated monomer were placed in a 3-capacity autoclave. A mixture of the autoclave and a polymerization initiator was charged into an autoclave while stirring. After the reaction was completed, unreacted ethylenically polymerizable unsaturated monomers were removed under reduced pressure to obtain various desired polymer polyols. They are shown in Table 1.

[Table] Production Example 2 Various main ingredients containing urethane prepolymers containing terminal isocyanate groups were produced according to the following production method. In addition, in the production examples, the numbers in parentheses indicate the blending ratio. (A-1) After dehydrating a mixture of polyoxypropylene glycol (95) with an average molecular weight of 2000 and polyoxypropylene triol (5) with an average molecular weight of 260, TDI-80 (21) was added under stirring, and 100 3.7% free isocyanate groups after 2 hours reaction at °C
A urethane prepolymer (hereinafter referred to as A-1) was obtained. (A-2) After dehydrating a mixture of polyoxypropylene glycol (51) with an average molecular weight of 2000 and polyoxypropylene triol (34) with an average molecular weight of 3000, TDI-80 (15) was added under stirring, and 100 ℃
The free isocyanate group was 3.7
% containing urethane prepolymer (hereinafter referred to as A-2) was obtained. (A-3) Polymer polyol No. (51.5) and the same No.
(17) and the same No. (17) mixed polymer polyol were dehydrated, TDI-80 (14.5) was added under stirring, and reacted at 100°C for 2 hours to form a urethane prepolymer containing 3.7% of free isocyanate groups. (hereinafter referred to as A-3) was obtained. (A-4) Polyoxypropylene glycol (7.8) with an average molecular weight of 700, polyoxypropylene glycol (47) with an average molecular weight of 2000, polyoxypropylene triol (23.5) with an average molecular weight of 3000, and
Using TDI-80 (21.7), a urethane prepolymer (hereinafter referred to as A-4) containing 6.5% of free isocyanate groups was obtained in the same manner as in (A-1). (A-5) After dehydrating a mixture of a polyester diol (70) with an average molecular weight of 2000 obtained from 1,6-hexanediol and adipic acid and a polyester triol (30) with an average molecular weight of 3000 obtained from trimethylolpropane and adipic acid. , TDI-80 (31) was added under stirring and reacted at 100°C for 1 hour, then cooled to 70°C, xylene (20) was added, and a urethane prepolymer containing 6.5% free isocyanate groups (hereinafter A- 5) was obtained. (A-6) Polytetramethylene glycol (55) with an average molecular weight of 1000 was dehydrated under reduced pressure at 120°C for 60 minutes, and catalytic amounts of ethyl acetate (25), hexamethylene diisocyanate (20), and dibutyltin dilaurate were charged. 30 minutes into the reaction tank at a temperature of 60℃.
Add it gradually over a few minutes, and then add another 70
React for 60 min at °C to free isocyanate groups 5.5
A low viscosity liquid urethane prepolymer (hereinafter referred to as A-6) with a solid content of 75% was obtained. Production Example 3 A curing agent was produced according to the following production method. In addition, the numbers in parentheses in the production examples indicate the blending ratio. (B-1) MOCA (1) is heated and dissolved in polymer polyol No. (70) and polyoxypropylene triol (21) with an average molecular weight of 3000, and calcium carbonate (80), DOP (20), and octyl A small amount of lead acid (5%) (4), a silicone antifoaming agent (1), an antioxidant (3), etc. are blended into a total blending ratio of 200, and the mixture is thoroughly mixed using three rolls to make a cream. A colored viscous liquid cured product (hereinafter referred to as B-1) was obtained. (B-2) MOCA (1) is heated and dissolved in polymer polyol No. (35) and polyoxypropylene triol (26) with an average molecular weight of 3000, and then calcium carbonate (27), carbon (3), and DOP are added to it.
(3.7), a small amount of lead octylate (1.3), a silicone antifoaming agent, an antioxidant, etc. were blended, and the total blending ratio was 100, and the mixture was thoroughly mixed with three rolls.
A black viscous liquid cured product (hereinafter referred to as B-2) was obtained. (B-3) MOCA (3.7) was heated and dissolved in polyoxypropylene triol (12) with an average molecular weight of 3000 and KE-850 (liquid resin, Nippon Petrochemical Co., Ltd. (20), and calcium carbonate ( 54), carbon (3),
A small amount of DOP (3), lead octylate (1.3), a silicone antifoaming agent, an antioxidant, etc. are blended, and the total blending ratio is 100, and the mixture is thoroughly mixed with three rolls.
A black viscous liquid cured product (hereinafter referred to as B-3) was obtained. (B-4) Instead of the carbon in (B-2), chromium oxide green was used, and the other procedures were the same as in (B-2). ) was obtained. (B-5) Using chromium oxide green instead of carbon in (B-2), otherwise proceeding in the same manner as (B-2), using a green viscous liquid curing agent (hereinafter B
−5). (B-6) Polymer polyol No. (21), Kyuamine
ML-150 (MOCA 50% liquid product, manufactured by Ihara Chemical Industry Co., Ltd.) (33), calcium carbonate (34), DOP
(10) and chromium oxide green (2) were thoroughly mixed using a triple roll to obtain a green viscous liquid curing agent (hereinafter referred to as B-6). (B-7) Kyuamine ML-150 (MOCA 50% liquid product, manufactured by Ihara Chemical Industry Co., Ltd.) (33), calcium carbonate (50), DOP (15), and chromium oxide green (2)
were thoroughly mixed using a triple roll to obtain a green viscous liquid curing agent (hereinafter referred to as B-7). (B-8) Acrylic polyol (50) with an average molecular weight of 45,000, which is a copolymerization of methyl acrylate and hydroxyethyl acrylate, xylene (40), and chromium oxide green (10) are well mixed and dispersed to form a green, low-viscosity liquid. A curing agent (hereinafter referred to as B-8) was obtained. Production Example 4 A one-component urethane prepolymer was produced according to the following production method. In addition, the numbers in parentheses in the production examples indicate the blending ratio. (C-1) Polymer polyol No. (60.2), No.
(12.9) and mixed polyol of No. (12.9)
Dehydrated at 120℃ for 60 minutes, cooled to 90℃ after purging with nitrogen gas, added TDI-80 (14.0) with stirring,
4.6 free isocyanate groups after reacting for 2 hours at °C.
%-containing urethane prepolymer was obtained. This stuff contains well-dried calcium carbonate (55), carbon (4), DOP (41), benzoyl chloride (0.5), dibutyltin dilaurate (0.003).
was added and thoroughly mixed for 60 minutes at 80°C to obtain a one-component urethane prepolymer (hereinafter referred to as C-1) containing 2.2% of free isocyanate groups. (C-2) Mixed polyol of polypropylene glycol (66.7) with an average molecular weight of 2000 and polypropylene triol (16.7) with an average molecular weight of 5000 at 120℃
Dehydrated for 60 minutes, replaced with nitrogen gas, and cooled to 90℃.
Add TDI-80 (16.7) under stirring and incubate at 100℃ for 2 hours.
The reaction was carried out for a period of time to obtain a urethane prepolymer containing 4.6% of free isocyanate groups. Add well-dried calcium carbonate (55), DOP (40), benzoyl chloride (0.5), and dibutyltin dilaurate (0.003) to this mixture and heat at 80℃.
Mix well for 60 minutes, free isocyanate groups 2.2
% containing one-component urethane prepolymer (hereinafter C
-2). Production Example 5 A mixture of the base resin and curing agent obtained in Production Examples 1 to 4 or a one-component urethane prepolymer was placed on a flat Teflon plate to a thickness of about 2 mm (however, depending on the experiment)
No. 9 was applied to a thickness of approximately 400μ) at a temperature of 20℃ and humidity.
After curing for 10 days in a 65% standard room, the physical properties of the cured coating film of the obtained polyurethane resin were measured in accordance with JIS A-6021 and JIS K-5400. These results are shown in Table 2. From these results, it was confirmed that the material has physical properties that can be applied as waterproofing materials, paving materials, flooring materials, top coat materials, etc.

【table】

[Table] Example 1 Primer: Polyflex PR (one-component urethane primer; Daiichi Kogyo (manufactured by Yakuhin Co., Ltd.) was applied at 0.15 kg/m ² to prepare the base. After curing for 2 hours, the undercoating materials shown in Table 3 were applied to each substrate using a trowel. Next, polyethylene foam material in the shape of a diamond-shaped mesh was laid down as a cushioning material, lightly compacted with a rubber roller, and cured for about 4 hours to fix it. Next, the intermediate coating material shown in Table 3 was applied with a trowel and allowed to cure for one day.Furthermore, the top coating material and finishing material (top coat) were applied in the same manner. Each floor specimen) was obtained. After curing in a standard room at 60°C and 60% humidity for 7 days, their physical properties were measured. Comparative examples were also carried out in the same manner. The results are shown in Table 3. *Rhombus-shaped polyethylene foam material: A large number of closed-cell string-like polyethylene foams with a foaming ratio of 20 times and a diameter of about 3 mm spaced at 5 mm intervals.
It is made by laminating two layers arranged in parallel, and the first layer of foamed polyethylene and the second layer of foamed polyethylene intersect at an angle of about 15 degrees, and each intersection point (thickness of about 5.5 mm) are heat-sealed, and the gap is diamond-shaped (width 1 mm, length 10 mm), width 65 cm, length 100 m.
It is a reticulated foam material.

【table】

【table】

[Table] As is clear from Table 3, it was confirmed that by inserting the polyethylene foam material in the form of a rhombic network, the following properties against base cracks and movements, shock absorption properties, heat retention and insulation effects, etc. were significantly improved. Example 2 Kindergarten floor with slab concrete base 10m x 10
m was constructed. First, after thoroughly cleaning the base, apply 0.2% of Polyflex M-50 (one-component urethane primer; manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) as a primer.
Kg/m ² was applied evenly with a roller brush and the base was adjusted. After curing for 1 hour, an undercoat material (base resin A-3, curing agent B-2, base resin/curing agent ratio 1/2, coating amount 1 kg/m ² ) was applied uniformly and smoothly with a rubber trowel. Next, a layer of polypropylene foam material in the shape of a diamond-shaped mesh used in Example 1 was laid down as a cushioning material, thoroughly rolled with a rubber roller, and allowed to cure for 4 hours. Next, use the same material as the base coat material as an intermediate coat material.
Kg/ ^m2 It was applied evenly with a rubber lever and allowed to cure for one day. The next day, top coat material (base resin A-4, hardener B-7, base resin/hardener ratio 1/1, coating amount 2.0Kg/m ² )
was applied evenly and smoothly with a rubber trowel, and after curing for one day, finishing agent: top coat (main agent A-6,
Curing agent B-8, main agent/curing agent blending ratio 1/8)
0.3Kg/m ² was sprayed by airless spray. After about 5 hours, it was completely cured and became tack-free. The surface hardness of this floor is 84, and compared to a urethane-only floor without a cushioning agent, it has a better shock absorption effect, is suitable for exercise, is better for walking, and has less cold from the floor in winter, and has an excellent heat retention effect. It was confirmed that the floor was suitable for kindergarten floors. Example 3 Rooftop with mortar concrete base 15m x 15m
was constructed. First, after cleaning the bottom thoroughly, use Polyflex PR (one-component urethane primer) as a primer.
Daiichi Kogyo Seiyaku Co., Ltd.) was applied uniformly at 0.2 kg/m ² using a roller brush, and after curing for 2 hours, a solvent-based chlorinated rubber adhesive was applied at 0.2 kg/m ² . Next, polyethylene foam material in the shape of a diamond-shaped mesh was laid down as a cushioning material, and it was fixed by lightly rolling it with a rubber roller. After standing for 1 hour, 3.0 kg/m ² of intermediate coating material (C-1) was applied smoothly with a rubber rake and allowed to cure overnight. The next day, apply the top coat material (C-2) 2Kg/ ^m2 in the same manner.
I let it heal. The next day, the same finishing agent as in Example 2 was sprayed in the same manner. The surface hardness of this waterproof/paving material is 55, and it has been confirmed that no cracks occur at corners or joints, and it has excellent shock absorption properties, indicating that it can be used in athletic facilities as a waterproof/paving material. Admitted. *Rhombus mesh polyethylene foam material; A large number of closed-cell polyethylene strings with a foaming ratio of 15 times and a diameter of approximately 3 mm spaced at 5.5 mm intervals.
It is made by laminating two layers arranged in parallel, and the first layer of foamed polyethylene and the second layer of foamed polyethylene intersect at an angle of about 15 degrees, and the void is diamond-shaped (width 2 mm). , length 10mm)
It is a reticulated foam material.

Claims (1)

[Scope of Claims] 1. A construction material comprising a polyurethane resin layer formed above and/or below a cushioning material, wherein (A) the polyurethane resin layer comprises: a polyether polyol having an average molecular weight of 200 to 20,000; A main agent and a curing agent whose main component is a urethane prepolymer containing terminal isocyanate groups obtained by reacting an organic polyisocyanate compound with at least one polyol selected from polyester polyols having an average molecular weight of 500 to 3,000 or polymer polyols having an average molecular weight of 1,000 to 40,000. A polyurethane resin layer with a surface hardness of 15 to 90 (Shore-A, the same applies hereinafter), or a polyurethane resin layer with a surface hardness of 15 to 90 obtained by moisture-curing a urethane prepolymer containing terminal isocyanate groups, and (B) the said The cushioning material is made of many string-like organic foam materials.
A two-layer laminate consisting of layers arranged in parallel at regular intervals, such that the first layer of string-like organic foam material and the second layer of string-like organic foam material intersect at a certain angle. A construction material characterized by being laminated. 2. The construction material according to claim 1, wherein the first layer and the second layer of string-like organic foam material of the cushioning material are joined at their intersections.