JPH0780985B2 - Method for producing soft urethane foam for flame laminate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a soft urethane foam for a frame laminate.

(Prior Art) For polyurethane foam as a cushioning material, fabrics, nits, double russel, moquette, tricot,
A frame laminate sheet with a single-sided laminate that uses a surface material as an exterior material such as cowinits, PVC leather, genuine leather, etc., and the back side that additionally uses tricots, gold width, non-woven fabric, knitted fabric, spun bond, plain weave, etc. Frame laminated sheet of double-sided laminate with materials and reinforcing materials welded, is used for interior materials for vehicles such as automobiles,
Widely used for furniture and clothing.

This type of polyurethane foam is a conventional ester-modified polyol, ether-modified polyol or a mixture thereof, and a mixture of an unmodified ordinary polyol having a molecular weight of 3000 as a polyol component, using 3.5 to 4.5 parts by weight of water,
It had a TDI index of 110 to 115 and was manufactured using other foam stabilizers, tin catalysts, amine catalysts and the like.

When these raw materials are used to manufacture long-sized lobes (slabstock foam) with a length of 60 m,
It was excellent as "easy to dry" on the surface of the robe and "prevention of dents" on the bottom of the robe. However, the peel strength between the surface material and the urethane foam may be less than 0.3 kg / 2.5 cm depending on the frame laminating machine conditions and the type of surface material. Gas pressure, air pressure, line speed, compression of the foam and surface material, distance between the gas burner and foam, etc. are important as conditions for the frame laminating machine. If is special and complicated, the peel strength could fall below the standard (0.3kg / 2.5cm).

Further, generally, when the amount of water added is reduced while maintaining the density, the amount of foaming aid added increases, and as a result, a large amount of latent heat of vaporization is lost and foaming stability is often impaired.

(Problems to be Solved by the Invention) An object of the present invention is to provide a method for producing a soft urethane foam for frame laminate which is excellent in peel strength regardless of the conditions of the frame laminating machine or the type of surface material.

Another object of the present invention is to provide a method for producing a soft urethane foam for frame laminate which has improved foaming stability and excellent peel strength.

(Means for Solving Problems) In the production of a soft urethane foam for frame lamination, the present invention comprises reacting a polyol as a polyol with a carboxylic acid to form an ester-modified polyol obtained by esterification and reacting the polyol with an isocyanate compound. At least one of the urethane-modified polyols thus obtained is present in the presence of 1 to 15 parts by weight of an adipate, phthalate and phosphate ester plasticizer (excluding the aromatic phosphate ester compound) per 100 parts by weight of the polyol. The present invention relates to a method for producing a soft urethane foam for frame laminate having excellent peel strength, which comprises reacting with a polyisocyanate in an isocyanate use ratio of 33.3% or less and an isocyanate index of 102 to 115.

Examples of the ester-modified polyol in the present invention include those obtained by esterifying a polyol such as diol and triol with a carboxylic acid such as phthalic acid and adipic acid, and adding a viscosity modifier, and specifically, Takeda Yakuhin ( Actol L-27C (OH value 56), Actol L-28M (OH value 56), etc. as urethane-modified polyols, for example, by reacting a polyol such as diol or triol with an isocyanate compound to form a prepolymer. In addition, a viscosity modifier may be added. Specifically, Exenol 3201 (OH number 62) of Asahi Glass Co., Ltd., etc. may be used as a mixture of ester-modified polyol and urethane-modified polyol of Dainippon Ink Co., Ltd. High Prox ODX-1511
(Modified polyol 40%, OH value 58, etc.).

Tolylene diisocyanate (TDI) is mainly used as an isocyanate compound, but some diphenylmethane diisocyanate (MDI), tolidine diisocyanate (TODI), xylylene diisocyanate (XDI),
Diisocyanates such as naphthylene diisocyanate (NDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate (HMDI), lysine diisocyanate (LDI), triphenylmethane triisocyanate,
Examples thereof include polymethylene polyphenyl isocyanate (PAPI) and polyisocyanates such as carbodiimide-modified MDI.

In the present invention, at least one of the above ester-modified polyol and urethane-modified polyol and the polyol
By reacting 100 parts by weight of a plasticizer with 1 to 15 parts by weight, a soft urethane foam for frame laminate having excellent peel strength can be produced.

Examples of the plasticizer (excluding the aromatic phosphate compound) in the present invention include dioctyl phthalate (DOP),
Dioctyl adipate (DOA), trioctyl phosphate (TOP), dibutyl phthalate (DBP), butyl benzyl phthalate (BBP), etc. can be mentioned. If the amount of the plasticizer is less than 1 part, the effect is small, and if it exceeds 15 parts, the amount of smoke is increased during the frame lamination. The isocyanate usage ratio is preferably 33.3% or less, and the isocyanate index is preferably in the range of 102 to 115. Here, the isocyanate usage ratio indicates the usage ratio (% by weight) of the isocyanate component relative to the weight of the entire reaction system, and the isocyanate index is the number of isocyanate groups in the reaction system and the number of active hydrogen groups such as polyols, amines and water. The value is divided by and multiplied by 100. TD as the isocyanate component in the examples
I is used, in which case it is expressed as TDI ratio and TDI index, respectively.

In the invention, known foam stabilizers, metal catalysts, amine catalysts and the like can be used as other components. As the metal catalyst, for example, a tin catalyst such as stannous octoate is used. Lead catalysts can also be used. As the amine catalyst, for example, Dabco T (N, N, N'-trimethylaminoethylethanolamine) from Foodry Co., Toyo Syato NP of Toyo Soda Kogyo Co., Ltd., trimethylaminoethylpiperazine, Polycatt-12 of San Abbott Co., Ltd. N-methyldicyclohexylamine) 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). N-methylmorpholine, dabuco (triethylenediamine), pentamethyldiethylenetriamine, etc. used for soft urethane foams are also used unless discoloration of fibers or vinyl chloride sheets is taken into consideration.

The urethane foam suitable in the present invention has a heat generation starting temperature of 285 ° C. or less and a heat generation maximum temperature of 3 in a differential thermal analysis.
The peel strength was particularly excellent in this case.

(Example) Below, an example and a comparative example are given and demonstrated.

Examples 1 to 6 and Comparative Examples 1 to 6 3,000 g of Actcor L-27C was put in a 5 l Jyotsuki, and while stirring with a propeller mixer, 5.4 g of tin catalyst (equivalent to 0.18 parts), silicon foam stabilizer SF2909 (Toray Silicone). ) 30g
(Corresponding to 1.0 part), amine catalyst (A) Polycatt-12
(2.4g, equivalent to 0.08 parts), (B) Toyo Yatsuto NP (2.4g,
0.08 parts) and plasticizer DOA (30 g, 1 part, Mitsubishi Kasei Vinyl Co., Ltd.) and stir for 30 minutes to prepare a solution A.

Based on Table 1, 204.7 g of solution A is placed in a 500 cc descap, and each shortage of chemical solution is added with a graduated spid, and the required amount of water is added to adjust the temperature to 25 ° C. Separately, prepare the required amount of TDI in a 200 cc descap and adjust the temperature to 23 degrees, and use this as solution B.

Bring the temperature-regulated descap containing the liquid A to the homomixer, stir at the maximum rotation speed (about 10,000 rpm) for 5 seconds, and add the temperature-controlled liquid B. After 5 seconds of stirring 240 × 240 ×
Pour into a 240mm box and leave at room temperature for 24 hours.

Slit to 10mm thickness to make 150mm × 240mm sample, speed 20m / min with small frame laminating machine, distance between burner and foam 20mm, gas pressure 0.1kg / cm ² , foam compression 50%, cloth 150mm width It was frame-laminated with the Renka Tricot cut into pieces and left for 24 hours. The peel strength of the obtained frame laminate was measured using Tensilon (manufactured by Toyo Baldwin Co., Ltd.) under the conditions of a tensile strength of 50 mm / min and a vertical direction of 2.5 cm × 15 cm, and the average value of max3 and min3 was calculated. For differential thermal analysis, use a DSC manufactured by Rigaku Denki, and use an aluminum container, a sample amount of 3 to 4 mg, an air atmosphere,
The measurement was performed with the temperature rising rate of 5 ° C./min and the sample released. The results are shown in Table 1. The density of the foam was measured according to JIS K6401.

Claims (1)

[Claims] At least one of an ester-modified polyol obtained by reacting a polyol with a carboxylic acid as a polyol to form an ester and a urethane-modified polyol obtained by reacting the polyol with an isocyanate compound in producing a soft urethane foam for frame lamination. 1 to 15 per 100 parts by weight of the polyol
By weight, adipate, phthalate and phosphate ester plasticizers (excluding aromatic phosphate ester compounds)
The method for producing a flexible urethane foam for frame laminates having excellent peel strength, which comprises reacting with a polyisocyanate in the presence of 33.3% or less of isocyanate and an isocyanate index of 102 to 115.