JPS6354448A - Production of lowly air-permeable non-rigid urethane foam for flame lamination - Google Patents

Abstract

PURPOSE:To obtain the title urethane foam which is lowly air-permeable, by reacting an ester-modified and/or urethane-modified polyol and a polyol contg. phosphorus with an isocyanate compd. and water. CONSTITUTION:97-99.5wt% ester-modified and/or urethane-modified polyol (a) are/is mixed with 0.5-3pts.wt. phosphorus-contg. polyol (b) having a phosphorus content of 1.9-13% and a hydroxyl value of 56-510 to obtain a polyol (A). The component A is reacted with an isocyanate compd. (B) having an isocyanate index of 102-110 and an isocyanate ratio of not higher than 33.3% (e.g., tolylene diisocyanate), water (C) and optionally, a foam stabilizer, a metallic catalyst, an amine catalyst, etc. (D) to obtain the title urethane foam having an air permeability of 0.1-1ft<3>/min, a heat generation initiation temp. of not higher than 285 deg.C and the max. heat generation temp. of not higher than 300 deg.C in differential thermal analysis.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing a flexible urethane foam for frame laminates with low air permeability.

(Conventional technology) For polyurethane foam as a cushioning material, fabrics, knits, double raschel, moquette, tricot,
Collai knit, PVC leather, genuine leather, etc. are used as exterior materials, and single-sided laminated frame laminate sheets with welded surface materials are used, and in addition, tricots, gold cloth, nonwoven fabrics, stockinette, spunpond, plain woven fabrics, etc. are used. Double-sided laminated frame laminate sheets with welded backing materials and reinforcing materials are used as interior materials for automobiles and other vehicles.
Widely used for furniture, clothing, etc.

This type of polyurethane foam has conventionally used a mixture of ester-modified polyol, ether-modified polyol, or a mixture thereof and an unmodified ordinary polyol with a molecular i of 3000 as a polyol component, and water in an amount of 3.5 to 4.5 mol.
It was produced using 'lS with a TDI index of 110 to 115 and using other foam stabilizers, tin catalysts, amine catalysts, etc.

In order to make a long rope such as 60g+ using this polyurethane foam, it is necessary to
, it was excellent as a countermeasure against dents on the bottom.

When the above-mentioned frame laminate 7 ohm is used as a wadding material for automobile seat cushions, for example, a thin backing material is attached to the frame laminate 7 ohm, the fluffy fibers are processed into frame laminate on the outer material, and then the seat is made by punching and sewing. It was combined with the cushion.

Recently, for rationalization, a method has been adopted in which the outer fabric and frame laminate (7 ohm) are sewn together and then directly attached to a mold, and the urethane stock solution is directly injected into the mold. In this case, if the urethane foam comes into direct or indirect contact with the urethane foam stock solution and the air permeability of 7 ohm for frame laminate is large, a hard impregnated layer will be formed, resulting in a defective product.

(Problems to be Solved by the Invention) The purpose of the present invention is to form a hard impregnated layer even if a urethane foam stock solution is injected directly or indirectly (directly onto the backing material on the frame laminate 7 ohm) into a 7 ohm frame laminate. An object of the present invention is to provide a method for producing a soft urethane foam for frame laminate that does not require forming and has low air permeability.

(Means for Solving the Problems) When producing a flexible urethane foam for frame lamination, the present invention uses at least one of an ester-modified polyol and a urethane-modified polyol as a polyol, and 97 to 99.5 parts by weight of the polyol. The present invention relates to a method for producing a flexible urethane foam for frame laminates with low air permeability, which is characterized by using 0.5 to 3 parts by weight of a phosphorous-containing polyol for reaction.

In the present invention, examples of the ester-modified polyol include Actol L-27C (08 valence 56) manufactured by Narita Pharmaceutical Co., Ltd.
), Actocol L-28M (08 value 56), etc., urethane-modified polyols such as Asahi Glass Co., Ltd.'s Efsenol 3201 (08 value 62), etc., and mixtures of ester-modified polyols and urethane-modified polyols such as Dainippon Ink Co., Ltd. Co., Ltd.'s High Block xoDx-1511<
Modified polyol 40%, OH value 58), etc. can be mentioned.

As the incyanate compound, tolylene diisocyanate (TDI) is mainly used, but -diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TODI), xylylene diisocyanate (
XDI), Na7ethylene diisocyanate) (MDI
), isophorone diisocyanate (IPDI), hexamethylene diisonanate (HDI), dicyclohexylmethane diisocyanate (HMDI), lysine diisocyanate (LD), etc., triphenylmethane triisocyanate, polymethylene polyphenyl Examples include polyisocyanates such as isocyanate (PAPI) and carposiimide-modified MDI.

In the present invention, 0.5 parts of phosphorus-containing polyol is added to at least one of the ester-modified polyol and 9-rethane-modified polyol, and 97 to 99.5 parts by weight of the polyol.
By reacting with ~3 parts by weight, a flexible urethane foam for frame laminates with low air permeability can be produced.

In the present invention, as the phosphorus-containing polyol, a normal phosphorus-containing polyol is used, but one with a phosphorus content of 1.9 to 13% and a hydroxyl value of 56 to 510 is preferable. made, OH value 450),
Becol Y24 (manufactured by Sanyo Chemical, OH value Z40), FY
LOL6 (manufactured by Strowa Chemical Co., Ltd., OH value 240) can be exemplified. If the amount of the phosphorus-containing polyol is less than 0.5 parts, the effect of contributing to low air permeability will be small, and if it exceeds 3 parts, the cells will become closed cells, resulting in poor foaming. In order to prevent closed cells, it is desirable that the incyanate index is as low as 102 to 110, and from the standpoint of improving peel strength and preventing summer suffocation, the incyanate index is expressed by the following formula: Ratio 1j:
33.3% or less is desirable.

Incyanate ratio=aX100/b a: Incyanate usage amount b: A liquid + B [-foaming aid A particularly preferred isocyanate ratio is in the range of 20 to 33%.

In the present invention, known foam stabilizers, metal catalysts, amine catalysts, etc. can be used as other components.

A regular silicone foam stabilizer is used as a foam stabilizer, but
When using 5Z1919 manufactured by Nippon Unicar Co., Ltd., which is commercially available for low air permeability, the appropriate amount of phosphorus-containing polyol is 0.5 to 1 part. For open foam stabilizers, the amount of phosphorus-containing polyol used is preferably 0.5 to 3 parts. Air permeability is 0.1 to 0.1 to prevent impregnation of the urethane foam stock solution.
1 ft'/min is preferred.

As the metal catalyst, for example, a tin catalyst such as stannous ophtate is used. Lead catalysts can also be used. As the amine catalyst, for example, Dabeo T (N, N, N'
-) trimethylaminoethylethanolamine), Toyo Chara) NP from Toyo Soda Kogyo Co., Ltd.

Trinotylaminoethylbiperazine, Polycat-12 (N-methyldicyclohexylamine) manufactured by San Abbott Co., Ltd., and the like are used. These amine catalysts are resistant to discoloration of fibers and vinyl chloride sheets (heat resistance test at 100°C x 200 hours and side light test using a weatherometer).
If discoloration of fibers and vinyl chloride sheets is not taken into consideration, N-methylmorpholine, Gubuco (triethylenediamine), pentamethyldiethylenetriamine, etc. used in soft urethane foams may also be used.

The urethane foam suitable for the present invention has an exotherm onset temperature of 285° C. or lower and a maximum exothermic temperature of 300° C. or lower in differential thermal analysis, and in this case, the peel strength was particularly excellent.

(Example) Examples and comparative examples will be described below.

Examples 1 to 6 and Comparative Examples 1 to 4 7 tokol L-270 to 51 jockeys 2000
Add tin catalyst 2 while stirring with a propeller mixer.
．． 6g (equivalent to 0.13 parts), silicone foam stabilizer 5F290
9 (Toshi Silicone) 20g (equivalent to 1.0 parts), Amine Catalyst (A) Polycat-12 (1.0g, 0.0g)
(equivalent to 05 parts), (B) TOYOCAT NP (1.0g
, 0.05g equivalent) and stirred for 30 minutes, and then
Make it into a liquid.

Based on Table 1, add 2 as liquid A to a 500cc death cup.
Double the amount, add the insufficient amount of each chemical solution using a graduated dropper, add the required amount of water, and adjust the temperature to 25°C. Separately, prepare the required amount of TDr for a 200cc death cup.
The temperature was adjusted to 3°C and this was used as liquid B.

Place a temperature-controlled death cup containing liquid A under the rotor of the homomixer, stir for 5 seconds at the highest rotational speed (approximately 10,000 rpm plow), and add the required amount of temperature-controlled liquid B.

After stirring for 5 seconds, the mixture was poured into a 240 x 240 x 240 box and left at room temperature for 24 hours.

10-slit to the thickness of the seaweed, 150-■×240m5+
Make a sample and use small 7-laminate laminate 11 at speed 2.
0-7 minutes, distance between burner and 7 ohm 20-, gas pressure 0.1 kg/am'', 7 ohm compression 50%, fabric 15
It was laminated with a frame using tricot cut to 0+s- width and left for 24 hours. The peel strength of the obtained frame laminate sheet was measured using Tensilon (manufactured by Toyo Bold Twin Co., Ltd.) at a tensile speed of 50 m/win and a vertical dimension of 2.5 cm x 15 cm, wax 3.
The average value of and m1n3 was calculated. In addition, differential thermal analysis was performed using a Rigaku DSC using an aluminum container and sample i3.
~4 mg, measured in an air atmosphere, at a heating rate of 5°C/min, with the sample open. The results are shown in Table 1, and the density at 7 ohms was measured according to JIS K6401.

Also, the air permeability is 25mm+X51+*mX51mm sample, model D
Measured at A.

Table 1 Table 1 (Continued) (that's all)

Claims (2)

[Claims] (1) When producing a flexible urethane foam for frame lamination, at least one of an ester-modified polyol and a urethane-modified polyol is used as a polyol, and 0.5 to 3 parts by weight of a phosphorus-containing polyol is added to 97 to 99.5 parts by weight of the polyol. A method for producing a soft urethane foam for frame laminate with low air permeability, which is characterized by reacting the material by using a part of the urethane foam. (2) The manufacturing method according to claim 1, wherein the air permeability is 0.1 to 1 ft^3/min in the air permeability measurement of the urethane foam.