JPH08120139A - Polyvinyl chloride-based resin composition - Google Patents

Abstract

PURPOSE: To obtain a polyvinyl chloride-based composition excellent in thermal stability and long running ability during molding and heat resistance and impact strength of molded products. CONSTITUTION: This polyvinyl chloride-based composition comprises 100 pts.wt. polyvinyl chloride-based resin, 0.1-5 pts.wt. organotin-based stabilizer, 0.1-10 pts.wt. calcium stearate and 0.1-20 pts.wt. inorganic-based hydrogen chloride scavenger. The inorganic-based hydrogen chloride scavenger comprises 44.26-50.26wt.% silicon oxide, 29.30-35.30wt.% aluminum oxide, 14.45-20.45wt.% sodium oxide and very small quantities of calcium oxide and magnesium oxide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition which is excellent in thermal stability during molding, long-run property, heat resistance of molded products, impact resistance and the like.

[0002]

2. Description of the Related Art Vinyl chloride resins are excellent in mechanical strength, flame resistance, weather resistance, chemical resistance, etc., and have been widely used as various molded products. However, it has a drawback that thermal decomposition mainly due to dehydrochlorination occurs when performing heat molding processing, resulting in deterioration of mechanical strength of processed products,
There is a problem that the product value is lowered due to deterioration of color tone.

In order to improve such problems, there has been proposed a method of using stabilizers such as metal soaps, organic tin compounds and organic phosphites, alone or in combination. Japanese Unexamined Patent Publication No. 63-268756 discloses a method for stabilizing a chlorine-containing resin using an organotin compound having low toxicity and excellent heat stability as a stabilizer. However, the organic tin compound has a problem that when added in a large amount, the heat resistance of the molded product is significantly reduced.

The organic tin compound has the effect of improving the thermal stability during molding when used in combination with a calcium chloride scavenger such as calcium stearate or epoxidized soybean oil. However, when used in combination with calcium stearate, calcium stearate bleeds on the metal surface of the molding machine, which has the drawback of impairing long-run properties. It has the drawback that the thermal stability is greatly reduced.

[0005]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a vinyl chloride resin composition excellent in thermal stability during molding, long-run property, heat resistance of molded products, impact resistance and the like. With the goal.

[0006]

The gist of the present invention is 100 parts by weight of vinyl chloride resin, 0.1 to 5 parts by weight of organic tin stabilizer, 0.1 to 10 parts by weight of calcium stearate, and inorganic type. A vinyl chloride resin composition comprising 0.1 to 20 parts by weight of a hydrogen chloride scavenger, wherein the inorganic hydrogen chloride scavenger is 44.26 to 50.26% by weight of silicon oxide.
The present invention provides a vinyl chloride resin composition comprising 29.30 to 35.30% by weight of aluminum oxide, 14.45 to 20.45% by weight of sodium oxide, a trace amount of calcium oxide, and a trace amount of magnesium oxide.

The vinyl chloride resin is not particularly limited, and examples thereof include polyvinyl chloride, a copolymer of a vinyl chloride monomer and a monomer in which a vinyl chloride monomer can be copolymerized, and a vinyl chloride monomer and a vinyl chloride monomer are grafted. Examples thereof include a graft copolymer with a copolymerizable resin, chlorinated vinyl chloride obtained by post-chlorinating polyvinyl chloride, and a mixture thereof.

The monomer which can be copolymerized with the vinyl chloride monomer is not particularly limited, and examples thereof include olefins such as ethylene, propylene and butylene; vinyl esters such as vinyl acetate and vinyl propionate; isobutyl vinyl ether and cetyl. Vinyl ethers such as vinyl ether and phenyl ether; (meth) acrylic acid esters such as methyl (meth) acrylate and ethyl (meth) acrylate; aromatic vinyls such as styrene and α-methylstyrene; (meth) acrylonitrile and the like Vinyl cyanides; vinyl halides such as vinylidene chloride and vinyl fluoride; unsaturated dicarboxylic acid esters such as dimethyl maleate and dimethyl fumarate; unsaturated dicarboxylic acid anhydrides such as maleic anhydride; cyclohexyl maleimide, phenyl male Non polar monomers N- substituted maleimides such as bromide and the like. You may use these in combination of 2 or more type.

There are no particular restrictions on the resin to which the vinyl chloride monomer is graft-copolymerizable, and examples thereof include (meth) acrylic acid ester polymers, ethylene / vinyl acetate copolymers, and ethylene / acrylic acid ester polymers. Copolymers, chlorinated polyethylene, chlorosulfonated polyethylene, polyurethane and the like can be mentioned.

The degree of chlorination of chlorinated vinyl chloride obtained by post-chlorinating the above polyvinyl chloride is preferably 57 to 72% by weight. If it exceeds 72% by weight, the moldability will be significantly reduced. More preferably, it is 57 to 68% by weight. The degree of polymerization of the vinyl chloride resin is preferably 400 to 1400.

The amount of the organic tin-based stabilizer used in the present invention is 0. 0 based on 100 parts by weight of the vinyl chloride-based resin.
1 to 5 parts by weight. If it is less than 0.1 part by weight, a sufficient heat stabilizing effect cannot be obtained, and if it exceeds 5 parts by weight, the heat resistance of the molded product is remarkably reduced, so the content is limited to the above range. It is preferably 0.3 to 3 parts by weight.

The organotin stabilizer is not particularly limited, and examples thereof include monoalkyltin mercapto, dialkyltin mercapto, monoalkyltin mercaptopolymer, dialkyltin mercaptopolymer, monoalkyltin mercapto sulfide, and dialkyltin mercapto sulfide. Mercapto-based stabilizers; malate-based stabilizers such as monoalkyltin malates, dialkyltin malates, monoalkyltin malate polymers, dialkyltin malate polymers; carboxylate-based stabilizers such as monoalkyltin carboxylates and dialkyltin carboxylates. Etc. The alkyl group contained in the organotin stabilizer may be a linear alkyl group or a branched alkyl group, for example,
Examples thereof include a methyl group, a butyl group and an octyl group. The above organotin stabilizers may be used alone or in combination of two or more.

The amount of calcium stearate used in the present invention is 0.1 to 10 parts by weight based on 100 parts by weight of the vinyl chloride resin. If it is less than 0.1 part by weight, a sufficient heat stabilizing effect cannot be obtained, and if it exceeds 10 parts by weight, it bleeds to the metal surface of the molding machine and impairs the long-run property. Preferably 0.3
~ 5 parts by weight. The calcium stearate is not particularly limited, and for example, widely used calcium stearate can be used.

The amount of the inorganic hydrogen chloride scavenger used in the present invention is 0.1 to 20 parts by weight based on 100 parts by weight of the vinyl chloride resin. If it is less than 0.1 part by weight, a sufficient heat stabilizing effect cannot be obtained, and if it exceeds 20 parts by weight, the impact resistance of the molded product is remarkably reduced, so the content is limited to the above range.

The inorganic hydrogen chloride scavenger is composed of 44.26 to 50.26% by weight of silicon oxide and 2% of aluminum oxide.
9.30 to 35.30% by weight, sodium oxide 14.4
It consists of 5 to 20.45% by weight, a trace amount of calcium oxide, and a trace amount of magnesium oxide. Examples of the inorganic hydrogen chloride scavenger include "CAL" manufactured by Calfar Chemical Co., Ltd.
FA VF-GA-B "and the like.

The vinyl chloride resin composition of the present invention contains a lubricant, a processing aid, an antioxidant, an ultraviolet absorber, if necessary, within a range that does not significantly impair molding processability, heat resistance and impact resistance of the product. You may contain compounding agents, such as an agent. The compounding agent is not particularly limited, and for example, those conventionally used as compounding agents for vinyl chloride resins may be used.

The method for molding the vinyl chloride resin composition of the present invention is not particularly limited, and examples thereof include an extrusion molding method, an injection molding method and a calender molding method. Molded articles obtained from the vinyl chloride resin composition of the present invention include, for example,
It can be used for various vinyl chloride resin products as materials such as pipes, joints, gutters, plates and deck materials.

[0018]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Examples 1 to 5 and Comparative Examples 1 to 6 100 parts by weight of vinyl chloride resin (polymerization degree 1000, manufactured by Tokuyama Sekisui Co., Ltd., trade name "TS1000R") and dioctyl tin mercapto (as an organotin stabilizer) Predetermined amount of Sankoki Gosei Co., Ltd., trade name "ONZ-142F", calcium stearate (Sakai Chemical Industry Co., Ltd., trade name "SC-10"
0 "), a predetermined amount of an inorganic hydrogen chloride scavenger (Calfa Chemical Co., Ltd., trade name" CALFA VF-GA-B "), and butyl stearate as a lubricant (Kao Corporation, trade name" Exepar " BS ") and 0.5 parts by weight of polyethylene wax (manufactured by Mitsui Petrochemical Co., Ltd., trade name" High Wax 220MP ") were supplied to a Henschel mixer and mixed for 5 minutes to obtain a blended composition.

The compounded composition thus obtained was mixed with 8 inches
Kneading with a kissing roll at 190 ° C and kneading for 3 minutes
A sheet having a thickness of about 1 mm was obtained. This sheet is 30x30m
Cut into m and heat in a gear oven at 190 ° C for 10 minutes
Time to take out at intervals and decompose as thermal stability
(The test piece has a clear black color or black spots start to appear.
The time spent (minutes) was measured. Also, the roll table after kneading
The surface is observed and the degree of bleed occurrence is evaluated in the following three stages.
Was. A There is no bleeding on the roll surface B There is a little bleeding on the roll surface C There is a considerable bleeding on the roll surface
Pressure 150kg / cm ²Press-molded for 2 minutes at thickness 3
mm sheet, cut out the test piece,
Vicat softening temperature (according to JIS K 7206,
Load 1.0kgf), Charpy impact value as impact resistance
(According to JIS K 7111) was measured. Composition
The measurement results are shown in Table 1.

[0021]

[Table 1]

[0022]

Since the vinyl chloride resin composition of the present invention has the above-mentioned constitution, it is excellent in thermal stability during molding, long-run property, heat resistance of molded products, impact resistance, etc. It can be widely used as a product.

Claims (1)

[Claims] 1. A vinyl chloride resin 100 parts by weight, an organotin stabilizer 0.1 to 5 parts by weight, calcium stearate 0.1 to 10 parts by weight, and an inorganic hydrogen chloride scavenger 0.1.
A vinyl chloride resin composition comprising 1 to 20 parts by weight, wherein the inorganic hydrogen chloride scavenger is silicon oxide 44.2.
6 to 50.26% by weight, aluminum oxide 29.30 to
35.30% by weight, sodium oxide 14.45-20.
A vinyl chloride resin composition comprising 45% by weight, a trace amount of calcium oxide, and a trace amount of magnesium oxide.