JPS6392421A - Manufacture of polyurethane foam integral molding - Google Patents

Abstract

PURPOSE:To prevent a skin from discoloring during heating by a method wherein expandable mixture, which consists of polyol, crosslinker, catalyst, additive, compound containing hydroxyl group and epoxy group and isocyanate ingredient, is cast in a skin made of chlorine containing resin. CONSTITUTION:A polyurethane foam integral molding is manufactured by casting expandable mixture, which consists of polyol, crosslinker, catalyst, additive, compound containing hydroxyl group and epoxy group and isocyanate ingredient, in a skin made of chlorine containing skin. As the compound containing hydroxyl group and epoxy group, partial addition product of epoxized polybutadiene, partial addition product of epoxized vegetable oil or partial addition product of epoxized caster oil is employed. In case of partial addition product of epoxized polybutadiene or partial addition product of epoxized vegetable oil, 0.6 parts or more by weight of oxirane oxygen content is necessary to 100pts.wt. of polyurethane foam. In case of partial addition product of epoxized castor oil, the heat discoloring of a skin material can be prevented from generating by using 0.05 parts or more by weight of oxirane oxygen content.

Description

[Detailed Description of the Invention] [Industrial Application Fields Copolyurethane foam integrally formed products are mainly composed of a soft vinyl chloride resin skin and polyurethane foam, and are used as automobile interior parts such as crash pads, instrument panels, headrests, and console boxes. It is used.

[Prior art and problems] Such polyurethane foam integrally formed products are produced by loading a soft vinyl chloride resin skin obtained by a powder slush molding method into a metal lower mold, and forming a polyurethane foam product consisting of a polyol component and an isocyanate component. It is produced by injecting a heavy mixture into the epidermis, then closing the upper mold, and removing the mold after the urethanization reaction and foaming are completed.

If a car is left in the scorching sun for a long time with the windows closed, the surface of a classic bat may reach over 100°C, and under these conditions, the skin material and the methane foam inside will gradually deteriorate. It may turn blackish brown.

This tendency is particularly noticeable when the molded article is exposed to temperatures of 110° C. or higher.

In order to solve this problem, there is a method of blending phosphorus-based compounds into polyurethane raw materials, which is disclosed in Japanese Patent Application Laid-Open No. 60-2011.
2114, etc.

Although such improvements were effective for a certain amount of time, the effects were insufficient for a long time.

[Structure of the Invention] The present invention provides a foamable mixture consisting of a polyol, a crosslinking agent, a reaction catalyst, an additive, a compound containing a hydroxyl group and an epoxy group, and an isocyanate component into a skin molded from a chlorine-containing resin. The present invention relates to a method of manufacturing an integrally formed polyurethane foam product, which is characterized by injection.

Furthermore, it relates to a compound containing a hydroxyl group and an epoxy group used in the -1-2 method.

The polyol component used in the present invention consists of a reaction catalyst, additives, etc. in addition to alcohol. For polyols, polyneedle polyols with a molecular weight of 800 to 12,000 or such polyether polyols are graft-polymerized with polymerizable vinyl monomers such as methylone, acrylonitrile, etc., or polymers of these polymerizable monomers or polyesters. A polymer polyol in which an organic substance such as a urea compound is dispersed is used.

As a crosslinking agent, a diol having a molecular weight of 62 to 500,
Triols, as well as polyfunctional polyols, alkanolamines, polyamines, and the like are used.

As additives, water, blowing agents such as triclofluoromonofluorozodan and methionone chloride, and flame retardants such as phosphorus compounds are used.

As the isocyanate component, tri-L diisocyanate, diphenylmethane diisocyanate-1, polymethylene borifugo, nyl isocyanate, chemically modified polyisocyanates, and these isocyanate compounds and polyols are used. or mixtures of these isocyanates are used.

As the chlorine-containing resin for the skin material, polyvinyl chloride, vinyl chloride copolymer, polyvinylidene chloride, chlorinated polyethylene, chlorinated polypropylene, etc. are used.

The compound containing a hydroxyl group and an epoxy group used in the present invention is an epoxidized portion of polybutadiene (
Additives, partial adducts of epoxidized vegetable oils such as epoxidized soybean oil, epoxidized hempseed oil, epoxidized cottonseed oil, and epoxidized rapeseed oil, and polyfunctional epoxy compounds and '0-mass oil are separated under a catalyst. What about epoxy compounds and castor oil? A konpo compound is used.

These compounds containing a noeboxy group in addition to a hydroxyl group can be pre-dissolved in the polyol component, or
It can be added to the reaction system simultaneously with the urethanization reaction.

The amount of the compound containing a hydroxyl group and an evo-4' group needs to be changed depending on the type of compound used.
In the case of a part 14 additive of epoxidized vegetable oil, add 100 parts by weight of 100 parts by weight of oxirane to 100 parts by weight of oxirane oxygen, and whether it is necessary to use 0.6 parts by weight or more of oxirane oxygen. In the case of oxirane, thermal discoloration of the superficial phase can be prevented by using 0.05 parts by weight of oxirane or 0.1 parts by weight.

[Examples and Comparative Examples] 100 parts of a polyether polyol with a molecular weight of 6,000, which is a mixture of trimethylolpropane with ethylene oxide and propylene oxide, Tosu J, and sulfonolamine 1
Part, processing of ethylene cyamine〉oxide 14 additive (0
14 valent 480 mg [111 parts g) 2 parts, water 2.5
Mixture I consisting of 0.1 part of Triethyl L and 0.1 part of Rediamine
J, polybutadiene epoxide with partial addition of 4 (hereinafter referred to as stabilizer A) (Bryol LPIIX-701 manufactured by Asahi Denka T-gyo Oro) (oxirane oxygen Jq,
6.3Z) or 10 or 20 parts (equivalent to 0,0,1.1 small part per 100 parts by weight of moly A, silane oxygen or polyurethane A, -J) or epoxy compound. 5 parts or 20 parts (oxirane oxygen concentration: 2.3 The weight is 0.0% per 100 parts by weight of polyurethane foam.
(equivalent to 1.0.5 parts by weight), or a partial adduct (hereinafter referred to as stabilizer C) of epoxidized linseed oil (Adeka Argus 110-18OA) (oxirane oxygen concentration 5.0χ)
15 parts of (oxyrane oxygen weight corresponds to 0.8 parts by weight per 00 parts by weight of polyurethane foam) were added. The mixture was uniformly mixed using a screw type stirrer (approximately 2000 rpm) to obtain a polyol component.

A 1 mm thick polyvinyl chloride skin material molded into the shape of an instrument panel using the powder slush molding method was placed on an aluminum lower mold, an ABS resin plate was attached to an aluminum upper mold, and heated to 40 to 50°C. did.

The polymethylene polyphenylisocyanate and the polyol component were mixed so that the isocyanate index was 100, and after stirring for about 10 seconds with a screw type stirrer (about 2000 rpm), the overall density of the foam was about 15 g. /yn3.

The surface hardness (Asker-C) of the polyurethane foam thus obtained was approximately 36.

After 10 minutes, the mold was removed to obtain an integrally formed three-layer structure consisting of polyvinyl chloride skin/polyurethane foam/ABS resin plate. A sample containing a polyvinyl chloride skin and polyurethane foam with a length of 5 cm, width of 5 cm, and thickness of 3 cm was cut out from this integrally formed product and heated in a gear oven at 110°C. After 100 hours, 200 hours, and 350 hours, the sample was taken out of the gear oven, and using a 5M color computer (manufactured by Suga Test Instruments), the color difference value (ΔE
) was measured.

The results are shown in Table 1.

As a comparative example, a case in which a compound containing a hydroxyl group and an epoxy group was not added, or a case in which triphenylphosphite (
20 or 40 parts of a stabilizer (hereinafter referred to as stabilizer) was added and an integrally formed product was obtained in the same manner as in the examples.

A heating test was conducted on the sample in the same manner as in the example, and the results are shown in Table 2.
Shown below.

Table 1 Table 2 [Effects of the present invention] As is clear from the Examples and Comparative Examples, a partial adduct of an epoxidized polybutadiene, an epoxy compound/castor oil adduct, or a partial adduct of an epoxidized vegetable oil was added. An integrally formed product made of polyurethane foam and chlorine-containing resin has less discoloration of the skin when heated.

that's all

Claims (1)

[Claims] 1. A foamable mixture consisting of a polyol, a crosslinking agent, a reaction catalyst, an additive, a compound containing a hydroxyl group and an epoxy group, and an isocyanate component is injected into a skin molded from a chlorine-containing resin. A method for manufacturing an integrally molded polyurethane foam product. 2. The method for producing an integrally molded polyurethane foam product according to claim 1, wherein the compound containing a hydroxyl group and an epoxy group is a partial adduct of an epoxide of polybutadiene. 3. Method for producing an integrally formed polyurethane foam product according to claim 1, characterized in that the compound containing a hydroxyl group and an epoxy group is an epoxy compound/castor oil adduct. 4. Compound containing a hydroxyl group and an epoxy group. 2. The method for producing an integrally molded polyurethane foam product according to claim 1, wherein the polyurethane foam is a partial adduct of epoxidized vegetable oil. 5 Contains hydroxyl groups and epoxy groups, which are used when producing an integral molded product by injecting a foamable mixture consisting of a polyol, a crosslinking agent, a reaction catalyst, an additive, and an isocyanate component into a skin molded from a chlorine-containing resin. Compound.