JPH0542972B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Field of Application) The present invention relates to a method for producing a flexible urethane foam for frame laminate with low air permeability. (Prior art) In contrast to polyurethane foam as a cushion material, woven fabrics, knits, double laces, moquettes, tricots, kouinnits, PVC leather,
A single-sided laminated frame laminate sheet with a welded surface material as an exterior material made of genuine leather, etc., and backing materials and reinforcing materials made of tricots, gold cloth, nonwoven fabric, stockinette, spunbond, plain weave, etc. Frame laminate sheets, which are laminated on both sides by welding, are widely used for interior materials for vehicles such as automobiles, furniture, clothing, etc. Conventionally, this type of polyurethane foam uses a mixture of ester-modified polyol, ether-modified polyol, or a mixture thereof and an unmodified ordinary polyol with a molecular weight of 3000 as a polyol component, and water is added.
Using 3.5-4.5 parts by weight, with a TDI index of 110-115,
It was manufactured using other foam stabilizers, tin catalysts, amine catalysts, etc. For example, 60m using this polyurethane foam.
When making long robes, it was an excellent countermeasure against ``drinking'' on the surface of the robe and dents on the bottom.
When the above-mentioned frame laminate foam is used as a wading material for automobile seat cushions, for example, a thin backing material is pasted on the frame laminate foam, fluffy fibers are processed into frame laminate on the outer material, and then the seat cushion is made by punching and sewing. He was fused with Siyeon. Recently, for rationalization, a method has been adopted in which the outer fabric and frame laminate foam are sewn together and directly attached to a mold, and the urethane 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 the frame laminating foam is high, 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 prevent the formation of a hard impregnated layer even when a urethane foam stock solution is injected directly or indirectly (directly onto the backing material on the frame laminate foam) into the frame laminate foam. An object of the present invention is to provide a method for manufacturing a soft urethane foam for frame laminate with low air permeability. (Means for Solving the Problems) The present invention uses an ester-modified polyol and the polyol 97 to 99.5 as a polyol when producing a flexible urethane foam for frame lamination.
The present invention relates to a method for producing a flexible urethane foam for flame laminate with low air permeability, which is characterized by using 0.5 to 3 parts by weight of a phosphorous-containing polyol and reacting the same. In the present invention, examples of the ester-modified polyol include Actocol L-27C (OH
56), Actocol L-28M (OH value 56), and the like. Tolylene diisocyanate (TDI) is mainly used as an isocyanate compound, but diphenylmethane diisocyanate (MDI),
Tolidine diisocyanate (TODI), xylylene diisocyanate (XDI), naphthylene diisocyanate (NDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate (HMDI), lysine diisocyanate (LDI)
Diisocyanates such as triphenylmethane triisocyanate, polymethylene polyphenyl isocyanate (PAPI), carbodiimide-modified MDI
Examples include polyisocyanates such as. In the present invention, a flexible urethane foam for flame laminate with low air permeability can be produced by reacting the ester-modified polyol and 0.5 to 3 parts by weight of a phosphorus-containing polyol with 97 to 99.5 parts by weight of the polyol. can. In the present invention, a normal phosphorus-containing polyol is used as the phosphorus-containing polyol, and the phosphorus content is 1.9 to 1.9.
13% and a hydroxyl value of 56 to 510 are preferred. Adeka FC450 (manufactured by Asahi Denka, OH
450), Pegacol Y24 (manufactured by Sanyo Chemical, OH value)
240) and FYLOL6 (manufactured by Strowa Chemical, OH value 240). 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, the isocyanate index is preferably as low as 102 to 110, and from the standpoint of improving peel strength and preventing scorch in the summer, the isocyanate ratio expressed by the following formula is preferably 33.3% or less. Isocyanate ratio = a x 100 / b a: Isocyanate usage b: A liquid + B liquid - foaming aid A particularly preferred isocyanate ratio is in the range of 20 to 33%. In the present invention, other components include a known foam stabilizer,
Metal catalysts, amine catalysts, etc. can be used. A regular silicone foam stabilizer is used as a foam stabilizer, but when using SZ1919 from Nippon Unicar Co., Ltd., which is commercially available for low air permeability, the amount of phosphorus-containing polyol used is 0.5 to 1 part. Appropriate. For open foam stabilizers, the amount of phosphorus-containing polyol used is 0.5~
Three copies are preferred. The air permeability is preferably 0.1 to 1 ft ³ /min from the viewpoint of preventing impregnation of the urethane foam stock solution. As the metal catalyst, for example, a tin catalyst such as stannous octate is used. Lead catalysts can also be used.
As an amine catalyst, for example, Dabco from Foudry
T (N,N,N'-trimethylaminoethylethanolamine), Toyocat from Toyo Soda Kogyo Co., Ltd.
NP, trimethylaminoethylpiperazine, Polycat-12 (N-methyldicyclohexylamine) from Sanabbot 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 for 200 hours and light resistance test using a weatherometer). If discoloration of fibers and vinyl chloride sheets is not taken into consideration, N-methylmorpholine, DABCO (triethylenediamine), pentamethyldiethylenetriamine, etc. used in soft urethane foams may also be used. The urethane foam suitable for the present invention has an exothermic onset temperature of 285°C or less in differential thermal analysis,
The maximum exothermic temperature was 300°C or less, 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 Actocol L-27C to No. 5 Jyotsky
Add 2000g of tin catalyst and add 2.6g of tin catalyst (equivalent to 0.13 parts) and silicone foam stabilizer while stirring with a propeller mixer.
Add 20 g (equivalent to 1.0 part) of SF2909 (Toray Silicone), amine catalyst (A) Polycat-12 (equivalent to 1.0 g, 0.05 part), and (B) Toyokyat NP (equivalent to 1.0 g, 0.05 part), stir for 30 minutes, and stir. Let this be liquid A. Based on Table 1, take twice the amount of liquid A into a 500cc.
Adjust the temperature. Separately, the required amount for a descap of 200 c.c.
Prepare TDI, adjust the temperature to 23℃, and use this as Solution B. A descap containing temperature-controlled liquid A is placed under the rotor of the homomixer, and the maximum rotation speed (approximately 10,000
rpm) for 5 seconds, and add the necessary amount of temperature-controlled solution B. After stirring for 5 seconds, the mixture is poured into a 240 x 240 x 240 mm box and left at room temperature for 24 hours. Cut into 10mm thick samples, make 150mm x 240mm samples, and use a small frame laminating machine at speed 20.
m/min, distance between the burner and the foam 20 mm, gas pressure 0.1 Kg/cm ² , foam compression 50%, the fabric was frame laminated with a 150 mm width cut tricot and left for 24 hours. The peel strength of the obtained frame laminate sheet was measured using Tensilon (manufactured by Toyo Baldwin) at a tensile speed of 50 mm/
min, measured under the conditions of 2.5cm x 15cm in the vertical direction,
The average value of max3 and min3 was calculated. In addition, differential thermal analysis was performed using a Rigaku DSC.
Sample amount 3-4 mg, air atmosphere, heating rate 5
°C/min, measured with the sample open. The results are shown in Table 1. Note that the density of the foam was measured according to JIS K6401. In addition, air permeability was measured using a Dow Air Flow device, model DA, on a 25 mm x 51 mm x 51 mm sample.

[Table] Test Example 1 JIS tensile strength, elongation, tear strength, and compression set of the urethane foams obtained in Examples 1 to 6.
Table 2 shows the results measured in accordance with K6401.

【table】

Claims (1)

[Claims] 1. When producing a flexible urethane foam for frame lamination, it is possible to react using an ester-modified polyol as a polyol and 0.5 to 3 parts by weight of a phosphorous-containing polyol to 97 to 99.5 parts by weight of the polyol. A manufacturing method for soft urethane foam for frame laminates with a characteristic low air permeability. 2. Claim 1 in which the air permeability is 0.1 to 1 ft ³ /min in the air permeability measurement of urethane foam.
Manufacturing method described in section.