JPS6010539B2 - Vinyl chloride resin composition for foaming - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel foamable vinyl chloride resin composition.

As a matter of fact, as a vinyl chloride resin composition for foaming, a resin containing a blowing agent, an auxiliary agent, a heat stabilizer, a cell conditioner, etc. is used, and the blowing agent is usually azodicarbonamide. However, zinc, cadmium, or lead salts of higher fatty acids such as stearic acid and octylic acid are used as auxiliaries, and general vinyl chloride stabilizers are used as heat stabilizers.
Further, as a cell conditioner, a surfactant such as an alkylbenzene sulfonate salt is used.

However, among these additives, there are various problems regarding auxiliary agents, and sufficient ones have not yet existed.

In other words, when the composition is heated and foamed using conventional auxiliary agents,
1} It takes time for foaming to start.

(This is called extremely slow rise.) [21 Because the rise is slow, the heating temperature (temperature of the foaming furnace) must be increased.

That is, in order to obtain the desired product, the solution was to raise the temperature of the foaming furnace or to lengthen the foaming time.

As a result of various studies, the present inventors have found a successful agent that does not have the above-mentioned drawbacks and have completed the present invention. The auxiliary agent according to the present invention is a zinc salt of an organic carboxylic acid having 6 or less carbon atoms, and specifically, a zinc salt of formic acid, acetic acid, caproic acid, etc., and tartaric acid,
Examples include zinc salts of oxyacids such as glycolic acid. These zinc salts may be used alone or in a mixture of two or more, and usually a small amount of about 0.50 to 2% by weight relative to the vinyl chloride resin exhibits sufficient effects.

It may be added in an amount exceeding 2% by weight, but even if it is used in a large amount, the effect will not increase much and it is economically undesirable.

In the present invention, the vinyl chloride polymer includes polyvinyl chloride and copolymers thereof, such as vinyl chloride-vinyl acetate copolymer, pinychloride-vinylidene chloride copolymer, and the like.

This vinyl chloride resin may be used alone or in combination of two or more, or in combination with a vinyl chloride resin and other polymers such as various synthetic rubbers, ethylene monovinyl acetate copolymers, acrylonitrile-butadiene-styrene copolymers, etc. Can be used in blends.

In addition to the above-mentioned additives, additives used in actual foaming include conventional foaming agents, heat stabilizers such as calcium stearate, barium, calcium laurate, barium, calcium benzoate, and barium, cell regulators, Furthermore, various known additives such as plasticizers, auxiliary plasticizers, fillers and pigments may be optionally blended as necessary.

As the foaming agent, azodicarbonamide is most suitable in terms of foaming temperature, economical efficiency, etc.

This will be explained in detail below using examples.

Example 1 The ingredients with the following composition were heated at 160°C with a mixing roll for 50 minutes.
Knead for minutes to make a sheet with a thickness of 0.3 feet, and 200q
The foaming state was measured by placing the mixture in a gear oven maintained at 0.000C.

The expansion ratio was calculated by measuring the thickness of the sheet. The results are shown in Table 1.

Blend composition PVC (Ceon lo group p) 10 Ikarito DOP
80 Z Azodicarbonamide 3 Barium stearate 1 Zinc salt listed in Table 1 Quantity listed in Table 1 × Expansion ratio As can be seen from Table 1, zinc stearate and zinc octylate used conventionally. In comparison, zinc salts of acetic acid, butyric acid, and tartaric acid, which are products of the present invention, show excellent effects.

Example 2 The ingredients having the following composition were spread on a glass plate to a thickness of 0.3, and left in a gear oven at 180 degrees for 5 minutes to produce a cured sheet.

The obtained sheet was placed in a gear oven maintained at 200 oo, and the foaming state was measured.

The expansion ratio was calculated by measuring the thickness of the sheet. The results are shown in Table 2. Blend composition: PVC (Q.

n121) 10 sparse DOP
80Azodicarbonamide 3Barium stearate
0.5 Zinc salt listed in Table 2 Quantity listed in Table 2 From Table 2, as in Table 1, the product of the present invention is superior to existing zinc stearate and zinc octylate. I understand.

Claims (1)

[Claims] 1. A foamable vinyl chloride resin composition containing one or more organic carboxylic acid zinc salts having 6 or less carbon atoms and azodicarbonamide.