JP2001234017A - Chlorinated vinyl chloride-based resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chlorinated vinyl chloride-based resin composition which maintains a tensile strength at high temperature, has a large impact-resistant strength at low temperature, and is used for molding. SOLUTION: This chlorinated vinyl chloride-based resin composition which comprises 100 pts.wt. of a chlorinated vinyl chloride-based resin having a mol.wt. of 600 to 1,500 before chlorinated and having a chlorination degree of 62 to 70 wt.%, 2 to 8 pts.wt. of a polyorganosiloxane and 1 to 5 wt.% of an acrylic modifier resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chlorinated vinyl chloride resin composition, and more particularly to a molding chlorinated vinyl chloride resin composition having high impact strength at low temperatures and high tensile strength at high temperatures.

[0002]

2. Description of the Related Art A molded article of a chlorinated vinyl chloride resin has a feature of high heat resistance, and is used at a relatively high temperature at which a conventional molded article of a vinyl chloride resin cannot be used due to heat deformation. Used for applications. For example, a chlorinated vinyl chloride resin molded article is used as a pipe for hot water, utilizing the fact that the heat distortion temperature is higher by 20 to 40 ° C. than that of a vinyl chloride resin molded article. Alternatively, a chlorinated vinyl chloride-based resin molded product is used as a sheet for household appliances to which heat is applied, utilizing the fact that the heat deformation temperature is higher than that of the vinyl chloride-based resin molded product. On the other hand, it is known that a molded article of a chlorinated vinyl chloride resin has a high tensile strength at a high temperature, but has a low impact resistance at a low temperature. In order to overcome the low impact resistance at low temperatures, it is known to incorporate an impact modifier such as ABS or MBS into a chlorinated vinyl chloride resin composition. These shock absorbers improve the impact resistance at low temperatures but are not satisfactory. In order to solve this problem, Japanese Patent Publication No.
In the chlorinated vinyl chloride resin composition, ABS and / or
Alternatively, it has been proposed to mix MBS and chlorinated polyethylene. However, although the impact resistance is improved and improved by blending chlorinated polyethylene with the chlorinated vinyl chloride resin composition, the softening temperature of the chlorinated vinyl chloride resin molded product decreases, and the tensile strength at high temperatures decreases. There was a problem of lowering. In order to minimize the decrease in the softening temperature and the decrease in the tensile strength at a high temperature, it is necessary to minimize the blending amount to 2 to 4 parts even when the chlorinated polyethylene is blended,
The impact resistance at low temperatures was not sufficiently improved, and was insufficient as a chlorinated vinyl chloride resin composition.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a preferable chlorinated vinyl chloride resin composition which maintains tensile strength at a high temperature and has excellent impact resistance at a low temperature.

[0004]

According to the present invention, in order to achieve the above object, the degree of polymerization before chlorination is from 600 to 1500.
And 100 parts by weight of a chlorinated vinyl chloride resin having a chlorination degree of 62 to 70% by weight and polyorganosiloxane 2
~ 8 parts by weight and acrylic modifier resin 1 ~
A chlorinated vinyl chloride resin composition comprising 5 parts by weight.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The average degree of polymerization of a vinyl chloride resin before chlorination, which is a raw material of the chlorinated vinyl chloride resin used in the present invention, is from 600 to 1500, preferably from 600.
~ 1300, more preferably from 600 to 1200,
The chlorination degree of the chlorinated vinyl chloride resin is 62 to 70% by weight, preferably 63 to 70% by weight, more preferably 64 to 70% by weight.
７０70% by weight. If the average degree of polymerization of the vinyl chloride resin as a raw material of the chlorinated vinyl chloride resin is less than 600, sufficient mechanical strength cannot be obtained, while if the degree of polymerization exceeds 1500, It is not preferable because processing is not easy. When the chlorination degree of the chlorinated vinyl chloride resin is less than 62% by weight, a composition having sufficient heat resistance cannot be obtained. On the other hand, when the chlorination degree exceeds 70% by weight,
It is not preferable because the melt viscosity becomes high and processing of the resin composition involves technical difficulties. In the present invention, "vinyl chloride resin" is a homopolymer of vinyl chloride, and other copolymerizable monomers with vinyl chloride, for example, ethylene, propylene, vinyl acetate, allyl chloride, allyl glycidyl ether, acrylic acid Includes copolymers with esters, vinyl ethers and the like.

In the present invention, the polyorganosiloxane is preferably an organic compound containing a silicone rubber and grafted with methyl methacrylate.
As such a polyorganosiloxane, S2001 manufactured by Mitsubishi Rayon Co., Ltd. is known.

[0007] If the amount of the polyorganosiloxane is less than 2 parts by weight, the impact resistance of the molded article is reduced. The chlorinated vinyl chloride resin composition of the present invention is characterized in that it contains 1 to 5 parts by weight of an acrylic modifier resin in addition to the polyorganosiloxane. The polyorganosiloxane alone cannot sufficiently satisfy the above-mentioned impact strength at low temperatures.

The acrylic modifier resin is a resin obtained by polymerizing an alkyl acrylate monomer, and particularly preferably a resin obtained by graft-polymerizing an alkyl acrylate resin with an alkyl methacrylate. The acrylic modifier resin may contain a butadiene component in a range of 20% by weight or less.
As the acrylic modifier resin used in the present invention, trade names FM-10 and FM manufactured by Kaneka Chemical Industry Co., Ltd.
-20 and FT-80 are known, and Rohm &
Product name KM334, KM365, KM manufactured by Haas
330 and the like. If the amount of the acrylic modifier resin used is less than 1 part by weight, the intended low-temperature impact resistance of the molded product is not satisfied. On the other hand, if the amount of the acrylic modifier resin used is 5 parts by weight or more, the tensile strength of the molded product at a high temperature becomes insufficient.

[0009]

The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited to these. In Examples and Comparative Examples, "parts" and "%" represent "parts by weight" and "% by weight", respectively, unless otherwise specified.

(Example 1) A vinyl chloride resin having a polymerization degree of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a chlorination degree of 67%. 100 parts of this chlorinated vinyl chloride resin
5 parts by weight of S2001 (polyorganosiloxane manufactured by Mitsubishi Rayon Co., Ltd.) and 4 parts of FM-10 (acrylic modifier resin manufactured by Kanebuchi Chemical Industry Co., Ltd.) as a shock absorber and 2 parts of a butyltin-based stabilizer as a stabilizer, 0.5 parts of synthetic zeolite, 2 parts of lubricant and 4.5 parts of titanium dioxide as filler were added as a stabilizing aid. The blend was hand blended to obtain a uniform blend.

[0011] The blend formulation is treated at 200 ° C with 8 inches.
And kneaded for 3 minutes with a roll of
A test piece was obtained by cutting after pressing for 10 minutes. JIS K
 Izod impact test at -7 ° C according to 7110
At this point, the Izod impact test value was 10.6 kg
cm / cm^TwoMet. In addition, JIS K 7113
When a tensile test was conducted at 82 ° C.
The degree is 246kg / cm ^TwoMet. Also, JIS K
Vicat softening point at 5 kg load according to 7206 is 1
17.4 ° C.

Example 2 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. 100 parts of this chlorinated vinyl chloride resin
5 parts by weight of S2001 (polyorganosiloxane manufactured by Mitsubishi Rayon Co., Ltd.) and 4 parts of FM-20 (acrylic modifier resin manufactured by Kanebuchi Chemical Industry Co., Ltd.) as a shock absorber and 2 parts of a butyltin-based stabilizer as a stabilizer, 0.5 parts of synthetic zeolite, 2 parts of lubricant and 4.5 parts of titanium dioxide as filler were added as a stabilizing aid. The blend was hand blended to obtain a uniform blend.

The blend was kneaded with an 8-inch roll at 200 ° C. for 3 minutes, pressed with a press machine at 205 ° C. for 10 minutes, and then cut to obtain a test piece. JIS K
When an Izod impact test at -7 ° C. was performed according to 7110, the Izod impact test value was 9.2 kg · c.
m / cm ² . In addition, when a tensile test was performed at 82 ° C. according to JIS K 7113, the tensile strength was 242 kg / cm ² . In addition, JIS K7
The Vicat softening point at 5 kg load according to 206 is 11
7.9 ° C.

Comparative Example 1 A vinyl chloride resin having a polymerization degree of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a chlorination degree of 67%. 100 parts of this chlorinated vinyl chloride resin
6 parts of B22 (MBS manufactured by Kanegafuchi Chemical Co., Ltd.) having a butadiene content of 46% as a shock absorber and a chlorine content of 36
% Chlorinated polyethylene Tyrin 3615P (manufactured by Dupont Dow Elastomers), 3 parts of a butyltin-based stabilizer as a stabilizer, 0.5 part of a synthetic zeolite as a stabilizing aid, 2 parts of a lubricant, and titanium dioxide as a filler. 4.5 parts were added. The blend was hand blended to obtain a uniform blend.

This blend was kneaded with an 8-inch roll at 200 ° C. for 3 minutes, pressed with a press machine at 205 ° C. for 10 minutes, and then cut to obtain a test piece. JIS K
When an Izod impact test at -7 ° C was performed according to 7110, the Izod impact test value was 8.5 kg · c.
m / cm ² . In addition, when a tensile test was conducted at 82 ° C. according to JIS K7113, the tensile strength was 241 kg / cm ² . In addition, JIS K7
The Vicat softening point at 5 kg load according to 206 is 11
6.2 ° C.

Table 1 summarizes the results of the above Examples and Comparative Examples.

[0017]

[Table 1]

[0018]

When a chlorinated vinyl chloride resin composition comprising 2 to 8 parts by weight of a polyorganosiloxane and 1 to 5 parts by weight of an acrylic modifier resin is used, the tensile strength of a molded article at a high temperature is maintained. The impact strength at low temperatures can be improved as it is, and the heat resistance can be improved.

Claims (1)

[Claims] 1. A chlorinated vinyl chloride resin having a degree of polymerization of 600 to 1500 before chlorination and a chlorination degree of 62 to 70% by weight, and 100 parts by weight of polyorganosiloxane 2
8 parts by weight and acrylic modifier resin 1 to 7
A chlorinated vinyl chloride resin composition comprising parts by weight.