JPH08295773A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE: To provide a vinyl chloride resin composition which is excellent in thermal stability during molding and gives a molded article excellent in heat resistance by mixing a vinyl chloride resin with a specified amount of sodium carbonate. CONSTITUTION: This composition is obtained by mixing 100 pts.wt. vinyl chloride resin with 0.1-30 pts.wt. sodium carbonate. If necessary, for example, a stabilizer, a lubricant, a processing aid, an antioxidant, an ultraviolet absorber, a foaming agent, etc., may be added to this composition.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vinyl chloride resin composition.

[0002]

2. Description of the Related Art Conventionally, vinyl chloride resins have been widely used as various molded products because of their excellent mechanical strength, flame retardancy, weather resistance, chemical resistance, etc. It has a drawback that when it is molded, it undergoes thermal decomposition mainly due to dehydrochlorination. Therefore, there has been a problem that the mechanical properties of the molded product are deteriorated, the color tone is deteriorated, and the commercial value is decreased.

In order to improve such problems, it has been proposed to use various stabilizers individually or in combination of two or more kinds. As such a stabilizer, various metal soaps, organotin compounds, lead compounds,
Examples of the organic phosphite include, for example, JP-A-63-26
Japanese Patent No. 8756 discloses a method of improving thermal stability by using an organic tin compound and perchloric acid together without impairing the transparency of a molded article.

It is also known that when an organic tin compound is used in combination with calcium stearate or a hydrogen chloride scavenger such as epoxidized soybean oil, the thermal stability during molding is improved. However, while the organic tin compound is excellent in thermal stability during molding, when added in a large amount or in combination with a hydrogen chloride scavenger such as epoxidized soybean oil, the heat resistance of the molded article is significantly reduced. There was a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and an object thereof is to obtain a molded product having excellent heat stability during molding and heat resistance. It is to provide a vinyl resin composition.

[0006]

The vinyl chloride resin composition of the present invention comprises a vinyl chloride resin and sodium carbonate.

As the vinyl chloride resin, those conventionally known can be used. For example, a homopolymer of vinyl chloride, a copolymer of vinyl chloride monomer and a polymerizable monomer other than vinyl chloride can be used. Polymers, graft copolymers obtained by grafting vinyl chloride onto polymers other than vinyl chloride, chlorinated vinyl chloride resins obtained by post-chlorination of these (co) polymers by a conventionally known method, the above ( Examples thereof include a mixture of a co) polymer and a chlorinated vinyl chloride resin.

The polymerizable monomer other than vinyl chloride is not particularly limited as long as it has a reactive double bond, and for example, α-, such as ethylene, propylene and butylene.
Olefins; Vinyl acetates such as vinyl acetate and vinyl propionate; Vinyl ethers such as isobutyl vinyl ether, cetyl vinyl ether and phenyl vinyl ether; Acrylic esters such as methyl acrylate and ethyl acrylate; Methacrylic acid esters such as methyl methacrylate and ethyl methacrylate Kinds: Aromatic vinyls such as styrene and α-methylstyrene; Vinyl cyanides such as acrylonitrile and methacrylonitrile; Vinyl halides such as vinylidene chloride and vinyl fluoride; Unsaturation such as dimethyl maleate and dimethyl fumarate Dicarboxylic acid esters; unsaturated dicarboxylic acid anhydrides such as maleic anhydride; N-substituted maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide; May be used in, two or more of them may be used in combination.

The polymer other than vinyl chloride used in the graft copolymer is not particularly limited, and examples thereof include (meth) acrylic acid ester polymers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid. Examples thereof include ester copolymers, chlorinated polyethylene, chlorosulfonated polyethylene and polyurethane.

When the average degree of polymerization of the above vinyl chloride resin is small, the mechanical properties of the obtained molded product are insufficient, and when it is large, the melt viscosity at the time of molding becomes high and molding becomes difficult. 400 is preferred.

If the degree of chlorination of the above chlorinated vinyl chloride resin increases, the moldability remarkably decreases.
The degree of chlorination of the vinyl chloride resin is preferably 72 to 72% by weight, more preferably 57 to 68% by weight.

In the vinyl chloride resin composition of the present invention, when the amount of sodium carbonate added is small, a sufficient heat stabilizing effect cannot be obtained, and when it is large, the moldability is remarkably lowered and the impact resistance is also lowered. Vinyl chloride resin 1
It is limited to 0.1 to 30 parts by weight with respect to 00 parts by weight,
It is preferably 0.3 to 20 parts by weight.

If necessary, stabilizers, lubricants, processing aids, antioxidants, ultraviolet absorbers, foaming agents and the like may be added to the vinyl chloride resin composition.

As a device used for mixing the respective components in the above manufacturing process, a generally known mixing device can be used, and examples thereof include a Henschel mixer, a crusher, a ribbon blender and the like.

As a molding method of the vinyl chloride resin composition, a conventionally known molding method can be adopted, and examples thereof include an extrusion molding method, an injection molding method and a calender molding method. By the above-mentioned molding method, for example, pipes, joints, plates, deck materials, etc. can be obtained.

[0016]

Embodiments of the present invention will be described below. (Examples 1 to 5 and Comparative Examples 1 to 3) A predetermined amount of vinyl chloride resin shown in Tables 1 and 2 ("TS1000 manufactured by Tokuyama Sekisui Co., Ltd."
R ”, degree of polymerization: 1,000), dioctyl tin mercapto (“ ONZ-142F ”manufactured by Sansha Machine Synthesis Co., organotin stabilizer), monoglycerin stearate as a lubricant (“ Rikemar S-100 ”manufactured by Riken Vitamin Co., Ltd. ") And polyethylene wax (Mitsui Petrochemical's" High Wax 220 "
MP ") was supplied to a Henschel mixer and mixed for 5 minutes to obtain a vinyl chloride resin composition.

Regarding this vinyl chloride resin composition,
The evaluation was performed, and the results are shown in Tables 1 and 2. (1) Heat resistance This resin composition was applied on an 8-inch mixing roll for 19 hours.
After wrapping at 0 ° C, kneading for 3 minutes, 1mm thick sheet
After obtaining this, cut this sheet into 30 x 30 mm and test
Pieces were made. This test piece is placed in a gear oven at 100 ° C
It is heated and taken out at intervals of 10 minutes and decomposed as heat stability.
Time to reach the test piece (clearly black or black
The time (minutes) at which the spots start to occur] is measured by visual observation.
did. (2) Vicat softening temperature After preheating the 1 mm thick sheet at 190 ° C. for 3 minutes,
Pressure 150kg / cm ²1 mm after press molding for 2 minutes
A thick plate was made. Trials cut from this plate
JIS K7206 is used as an index of heat resistance by using a test piece.
Vicat softening temperature is measured according to (load 1 kgf)
did. (3) Charpy impact value A test piece was prepared from the plate obtained in (2) and the impact resistance
In accordance with JIS K7111 as a sex index, Charpy
-The impact value was measured.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

The constitution of the vinyl chloride resin composition of the present invention is as described above, and it has excellent thermal stability during molding.
Moreover, the obtained molded product has excellent heat resistance.

Claims (1)

[Claims] 1. A vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin and 0.1 to 30 parts by weight of sodium carbonate.