JPS6079051A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin compsn. which is excellent in discoloration resistance and adhesion to polyurethane foam and suffers less drawdown, by blending Ba, Zn and Mg salts and a polyester polyol with a specified vinyl chloride resin. CONSTITUTION:1-15pts.wt. Ba, Zn and Mg salts and 1-10pts.wt. polyester polyol having an OH value of 5-30 are blended with 100pts.wt. vinyl chloride resin composed of 5-90wt% tetrahydrofuran-insoluble polyvinyl chloride gel component and the balance of tetrahydrofuran-soluble matter. Further, filler, plasticizer, stabilizer, lubricant, processing aid, pigment, etc. may be added. Since the resin compsn. suffers less drawdown in blow molding, moldings having high dimensional accuracy can be obtd. and even articles having large parison weights can be molded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vinyl chloride resin composition that has good adhesion to polyurethane foam, less discoloration caused by polyurethane foam, and less drawdown during blow molding.

In recent years, many automobile interior parts such as wrap rests and bend rests have been made by injecting polyurethane foam into injection molded and blow molded products made of vinyl chloride resin. The adhesion method between the skin layer and foamed polyurethane, the discoloration of the PVC skin layer caused by contact with foamed polyurethane (hereinafter referred to as urethane contamination), the drawdown phenomenon () in the case of blow molding, and the sagging of linden due to its own weight. 9) The phenomenon in which the wall thickness and outer diameter change appreciably) is large, and the palin is very heavy, not to mention φ molded products.
Even if the heavy lid was small, it was difficult to form a skin layer with uniform thickness. Currently, we are applying an adhesive to the PVC skin layer to improve the adhesion with foam polyurethane, and to prevent contact contamination with jelly urethane, we are choosing foam polyurethane, which is relatively less contaminated, and deepening the color of the skin layer. Methods have been taken to make the discoloration less noticeable, but these methods are not sufficient. Regarding drawdown in blow molding, a method is used to reduce the drawdown by using vinyl chloride resin with a high average degree of polymerization, but the effect is small and is not sufficient for molded products with a large weight of Nocrisone. I couldn't say it. In view of this situation, the present inventors conducted intensive studies and found that 100 parts by weight of a polyvinyl chloride resin consisting of 5 to 90 parts by weight of polyvinyl chloride which is insoluble in tetrahydrofuran and the remainder soluble in tetrahydrofuran contains Ba.
,Zn.

A polyester polyol containing 1 to 15 parts by weight of M-golden salt and an OH value of 5 to 30! It's m part,
They have invented a polyvinyl chloride resin composition that has good adhesion to Rirofoam polyurethane, has little discoloration caused by foamed polyurethane, and has low drawdown properties during blow molding.

According to the present invention, the PVC skin layer and the foamed i? There is no need to apply adhesive to bond polyurethane, leading to significant cost reductions and streamlining of processes. In addition, because there is little urethane contamination, it can be applied to molded products of nine colors. Also, in plow molding, because drawdown is small, molded products with good dimensional accuracy can be obtained, and it has become possible to mold even products with large lids.

In the present invention, if the amount of Ba, Zn, or Mf metal salt added is less than 1 part by weight, the effect on preventing urethane staining will be small and the thermal stability will be poor, so 1 to 15 parts by weight is suitable. In addition, the amount of polyester polyol added is 1
If the additive amount is less than 10 parts by weight or the OH value is 5 or less, the effect on the adhesion between polyurethane foam and the skin layer is extremely small, and if the amount added is more than 10 parts by weight or the OH value is 30 or more, it will not affect the surface of the molded product. Since blooming phenomenon sometimes occurs, various studies have revealed that it is desirable to use a polyester polyol with an OH value of 5 to 3 tons, and to add an amount within the range of 1 part by weight to 1 part by weight. 1 of the present invention? I
There is no limitation as long as it is listed in the vinyl chloride material handbook published by the J Vinyl Chloride Yarn Industry Research Group.

The technical content of the present invention will be explained below using examples.

Example 1 Each formulation shown in Table 1 was mixed in a super mixer, and 5
The bond was kneaded into grains using a zero extruder. This is extruded using a 75% extruder with a diameter of 200 tar, = 2 of the 2 cylinders with a thickness of 2
The molding material was unloaded using a blow molding machine with a 300 mm accumulator, and the drawdown properties were evaluated.

Example 2 Each of the formulations shown in Table 2 was mixed in a super mixer and kneaded and granulated in a 509 oder machine. This was molded using a 75% extruder with a blow molding machine equipped with a 2t accumulator with a parison diameter of 200I+III+1 parison wall thickness of 2mm, and then foamed polyurethane was injected and the adhesiveness and urethane staining properties were evaluated.

It can be seen from the above examples that the effects of the present invention are significant.

Claims (1)

[Claims] Polyvinyl chloride insoluble in tetrahydrofuran
Ba and Zn are added to 100 parts of vinyl chloride resin with 90% and the remainder being tetrahydrofuran.
, 1 to 15 parts by weight of a metal salt of Mf and an OH value of 5
~30-(: A vinyl chloride resin composition characterized by comprising a certain polyester polyol 1~lo).