JP2000226484A - Vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride resin composition which is excellent in extrusion foamability though it does not contain a blowing agent by compounding a vinyl chloride resin with a stabilizer, an antioxidant, hydrotalcite, and a plasticizer, each in a specified amount. SOLUTION: This composition comprises 100 pts.wt. vinyl chloride resin, 1-15 pts.wt. stabilizer (e.g. a barium/zinc-based stabilizer), 0.2-3 pts.wt. antioxidant (e.g. a polymeric hindered phenol), 0.5-90 pts.wt. flame retardant (e.g. a borate or a tin oxide hydrate), 2-25 pts.wt. double salt compound of zinc, magnesium, and aluminum represented by the formula (e.g. hydrotalcite), and 4-60 pts.wt. plasticizer selected from among phthalic esters, aromatic carboxylic esters, phopshoric esters, etc. The vinyl chloride resin includes a vinyl chloride homopolymer, an ethylene/vinyl chloride copolymer, a postchlorinated vinyl copolymer, etc., and preferably has a number average degree of polymerization of 300-7,000. In the formula, m is 0 or a positive number: 0<=x2/x1<10; 2<=x1+x2<20; and 0<=y<=2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vinyl chloride resin composition having excellent extrusion foaming properties.

[0002]

2. Description of the Related Art In a vinyl chloride resin composition, a foaming agent has been added to improve extrusion foamability. There was no material other than the foaming agent having excellent extrusion foamability.

[0003]

The object of the present invention is to provide a vinyl chloride resin composition which is excellent in extrusion foaming properties without adding a foaming agent.

[0004]

According to the present invention, 1 to 15 parts by weight of a stabilizer, 0.2 to 3 parts by weight of an antioxidant, and 3 to 2 parts of hydrotalcite are used for 100 parts by weight of a vinyl chloride resin.
A vinyl chloride resin composition comprising 5 parts by weight and 4 to 60 parts by weight of a plasticizer.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, vinyl chloride resins broadly refer to all polymers having a group represented by CH2-CHCl, such as vinyl chloride homopolymers and ethylene-vinyl chloride copolymers. Copolymers of vinyl and other polymerizable monomers except vinyl acetate, and those obtained by modifying homo- and copolymers such as post-chlorinated vinyl copolymers,
Furthermore, chlorinated polyolefins, such as chlorinated polyethylene, which are structurally similar to vinyl chloride resins are included. These vinyl chloride resins have a number average polymerization degree of 300 to 700.
It is preferably 0, and more preferably has a degree of polymerization of 500 to 2,000. These vinyl chloride resins can be used alone or in combination of two or more as a component of the vinyl chloride resin composition in the vinyl chloride resin composition of the present invention.

[0006] The stabilizer used in the present invention is not particularly specified, but may be any one used for the stabilization of ordinary PVC. For example, a lead-based, barium-zinc-based, calcium-zinc-based, or the like can be used. The amount of the stabilizer is 1 to 15 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the amount of the stabilizer is less than 1 part by weight, the effect of the stabilizer on PVC is small, and if it exceeds 15 parts by weight, there is a problem of chalking.

The antioxidants used in the present invention include phenol-based, sulfur-based and phosphorus-based antioxidants. In particular, high molecular weight hindered phenol is preferable from the viewpoint of heat aging characteristics, and the molecular weight is preferably 500 to 800. The addition amount of the antioxidant is 0.2 to 3 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the amount of the antioxidant is less than 0.2 parts by weight, the effect as an antioxidant is small, and if it exceeds 3 parts by weight, there is a problem of bloom. If the molecular weight of the high molecular weight hindered phenol is less than 500, there is a problem in persistence of the effect, and if the molecular weight exceeds 800, the effect is small.

The plasticizer used in the present invention is DO
Phthalates such as P, n-DOP, DINP, and DIDP mixed alkyl phthalates; aromatic carboxylic acid esters such as trioctyl trimellitate; trioctyl pyromellitate; fatty acid dibasic esters such as DOA, DOZ, and DOS Type, epoxy soybean oil, epoxy linseed oil epoxy type, phosphate ester type such as TCP and TOP, chlorinated paraffin, polyester type, etc., and can be used alone or in combination of two or more. The amount of plasticizer added is
It is 4 to 60 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the added amount of the plasticizer is less than 4 parts by weight, the effect as the plasticizer is small and the flexibility is not increased, and if it is more than 60 parts by weight, the expansion ratio is not increased.

Although the vinyl chloride resin has a certain degree of flame retardancy, a flame retardant may be added to the present invention in order to obtain a more flame retardant effect. The flame retardant is not particularly specified, but may be any as long as it is used for flame retardation of ordinary vinyl chloride resins. As inorganic flame retardants, zinc-based flame retardants such as zinc borate, zinc oxide, zinc carbonate, zinc silicate, antimony trioxide and composite flame retardants based thereon, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide , Zirconium oxide hydrate, tin oxide hydrate, basic magnesium, hydrotalcite, doulinite,
Examples include metal hydrates such as borax, talc, and calcium silicate. Examples of the organic flame retardant include phosphate esters such as TCP and TOP, and chlorinated paraffins.

The flame retardant is added in an amount of 0.5 to 90 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the added amount of the flame retardant is less than 0.5 part by weight, there is no effect of the flame retardancy.

The hydrotalcites used in the present invention are
A compound represented by the following formula (I),
It improves the electrical insulation and heat resistance. Above c
The hydrotalcite compound is represented by the following general formula (I).
Like magnesium and aluminum, or zinc,
Double salt compound consisting of magnesium and aluminum
The crystallization water may be dehydrated. Also,
Hydrotalcite compounds may be used in combination of two or more.
No. Mg_x1Zn_x2Al_Two・ (OH)_{2x1 + 2x2 + 4}・ (CO_Three)_{(1-y) / 2}(ClO_Four)_y・ MH _Two 0 (I) (where x₁, X_TwoAnd y are each a formula represented by the following formula:
M is 0 or arbitrarily positive number
You. 0 ≦ x_Two/ X₁<10,2 ≦ x₁+ X_Two<20, 0 ≦ y
≦ 2)

The hydrotalcite compound may be a natural product or a synthetic product. As a method for synthesizing the synthetic product, JP-B-46-2280, JP-B-50-30039
JP, JP-B-51-29129, JP-B-3-3
Known methods described in JP-B-6839, JP-B-61-174270 and the like can be exemplified. The crystal structure of the hydrotalcite is not specified.

The amount of the hydrotalcite added is 3 to 25 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the amount of the hydrotalcites is less than 4 parts by weight, the expansion ratio does not increase, and if it exceeds 25 parts by weight, a decrease in physical properties is observed.

The vinyl chloride resin composition of the present invention may further contain a lubricant, an inorganic filler, an ultraviolet absorber, a processing aid, a coloring agent, a crosslinking agent, and the like, if necessary.

[0016]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The components blended in the examples and comparative examples are as follows. -Vinyl chloride resin: PVC (manufactured by Shin Daiichi PVC Co .; average degree of polymerization = 1400)-Stabilizer: lead-based stabilizer; manufactured by Asahi Denka Kogyo Co., Ltd.-Plasticizer: trioctyl trimellitate (TOTM) ;
Dainippon Ink Co., Ltd. -Antioxidant: Bisphenol A; manufactured by Mitsui Toatsu Co., Ltd.-Hydrotalcite: Alkamizer 1; Kyowa Chemical
Co., Ltd.

<Examples and Comparative Examples> Using the above raw materials, the compounded compositions shown in Tables 1 and 2 were kneaded with a pressure kneader, and the kneaded material was pelletized, extruded with an extruder, and formed. Was measured. The expansion ratio is a numerical value obtained by dividing the true specific gravity by the specific gravity of the extruded product. (2) Tensile test: JISK6723 conformity ○: 15 MPa or more ×: less than 15 MPa These results are shown in Tables 1 and 2.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

According to the vinyl chloride resin composition of the present invention, the extruded foaming property which can be achieved only by adding a foaming agent is extruded without adding a foaming agent. Thus, a vinyl resin composition can be provided.

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Claims (1)

[Claims] [Claim 1] 100 parts by weight of a vinyl chloride resin,
1 to 15 parts by weight of a stabilizer, 0.2 to 3 parts by weight of an antioxidant,
Hydrotalcites 3-25 parts by weight, plasticizer 4-6
A vinyl chloride resin composition comprising 0 parts by weight.