JPH10195265A - Vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition having excellent physical characteristics such as tracking resistance and tensile properties and useful e.g. as a material for coating an electric wire by using a relatively large amount of an epoxidized vegetable oil in combination with magnesium carbonate, etc. SOLUTION: This composition is composed of (A) 100 pts.wt. of a vinyl chloride resin, (B) 20-70 pts.wt. of an epoxidized vegetable oil and (C) 25-150 pts.wt. of aluminum hydroxide. Preferably, the component A has an average polymerization degree of 700-8,000, the component B is an epoxidized soybean oil, etc., and the composition is further compounded with (D) 20-200 pts.wt. (based on 100 pts.wt. of the component A) of a plasticizer such as tri-2- ethylhexyl trimellitate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft vinyl chloride resin composition having excellent properties such as tracking resistance and tensile properties.

[0002]

2. Description of the Related Art Vinyl chloride resins are widely used as wire covering materials and power plug materials because of their inherent properties, namely, colorability, ease of molding, weatherability, and economy. Various properties are required for these applications, and tracking resistance is an important property. However, the soft vinyl chloride resin composition does not have sufficient tracking resistance, and attempts to improve tracking resistance by adding a large amount of an inorganic substance such as aluminum hydroxide. In addition to the deterioration of physical properties, the molded article has a disadvantage that the appearance of the molded article is poor and the appearance is poor and that the molded article is easily scratched.

Considering only the tracking resistance, polyethylene is excellent, but polyethylene has the drawback that its flame retardancy, heat softening resistance and hardness cannot be freely changed.
As a method of improving the tracking property, a composition comprising a vinyl chloride resin, a metal hydrate and a fatty acid ester is disclosed in JP-A-3-106955, but it is insufficient for improving the tracking property. Therefore, the appearance of a vinyl chloride-based resin composition having good tracking resistance and excellent mechanical properties has been strongly desired.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have developed a vinyl chloride resin composition which is suitable for use in electric wire coatings, power plugs, etc., which are excellent in both tracking resistance and mechanical properties by using a vinyl chloride resin. As a result of diligent studies to provide, the present inventors have found that the above object can be achieved by using a relatively large amount of epoxidized vegetable oil and magnesium carbonate or aluminum hydroxide in combination, and have completed the present invention. That is, an object of the present invention is to provide a vinyl chloride resin composition having excellent physical properties such as tracking resistance and tensile strength.

[0005]

The gist of the present invention is to provide a vinyl chloride comprising 100 parts by weight of a vinyl chloride resin, 20 to 70 parts by weight of an epoxidized vegetable oil, and 25 to 150 parts by weight of magnesium carbonate or aluminum hydroxide. It exists in a system resin composition.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail. The vinyl chloride resin which is a constituent component of the vinyl chloride resin composition of the present invention is a suspension polymerization method, a bulk polymerization method, or a mixture of vinyl chloride or a mixture of vinyl chloride and a copolymerizable monomer.
All those produced by ordinary methods such as a fine suspension polymerization method or an emulsion polymerization method are used. Examples of the comonomer include vinyl esters such as vinyl acetate, vinyl propionate and vinyl laurate; acrylates such as methyl acrylate, ethyl acrylate and butyl acrylate; methacrylates such as methyl methacrylate and ethyl methacrylate; and dibutyl. Maleates such as maleate and diethyl maleate; fumaric esters such as dibutyl fumarate and diethyl fumarate; vinyl ethers such as vinyl methyl ether, vinyl butyl ether and vinyl octyl ether; cyanides such as acrylonitrile and methacrylonitrile Α of vinyl chloride, ethylene, propylene, styrene, etc.
-Olefins, vinylidene chloride, vinylidene halides other than vinyl chloride such as vinyl bromide or vinyl halides, diallyl phthalate, polyfunctional monomers such as ethylene glycol dimethacrylate, etc. However, the present invention is not limited to this. The comonomer is contained in the component of the vinyl chloride resin in an amount of 30% by weight or less, preferably 20% by weight or less.

[0007] The average degree of polymerization of the vinyl chloride resin is not particularly limited.
The average degree of polymerization based on K6721 is 700 to 8000
, Preferably in the range of 700 to 4000.

In the vinyl chloride resin composition of the present invention, the epoxidized vegetable oil must be contained in an amount of 20 to 70 parts by weight, preferably 20 to 50 parts by weight, per 100 parts by weight of the vinyl chloride resin. . If the added amount of the epoxidized vegetable oil is less than 20 parts by weight, the effect of tracking resistance is insufficient. If the added amount exceeds 70 parts by weight, bleeding of the epoxidized vegetable oil occurs and the surface of the molded article becomes sticky. May occur.

Epoxidized vegetable oils include, for example, epoxidized soybean oil, epoxidized linseed oil, epoxidized cottonseed oil,
Examples include, but are not limited to, epoxy oleic acid. It is sufficient if the epoxidized vegetable oil is contained in the above range, but a plasticizer can be added for general purpose in order to adjust the hardness of the soft vinyl chloride resin composition. The addition amount of the general-purpose plasticizer is not particularly limited, and the addition amount of the epoxidized vegetable oil is in the above range, and the type of the vinyl chloride resin, the presence or absence of the filler, the type, the addition amount, etc. Accordingly, the amount of the plasticizer may be adjusted according to the desired hardness. Usually, the range is 20 to 200 parts by weight, preferably 30 to 150 parts by weight, per 100 parts by weight of the vinyl chloride resin.

The general-purpose plasticizer is not particularly limited as long as it is generally used for a vinyl chloride resin.
For example, dibutyl phthalate (DBP), dihexyl phthalate, di-2-ethylhexyl phthalate (DO
P), a phthalate plasticizer such as di-n-octyl phthalate, diisononyl phthalate (DINP), diisodecyl phthalate, butylbenzyl phthalate, or a phthalate of a higher alcohol having about 11 to 13 carbon atoms; di-2 -Ethylhexyl adipate, di-
n-octyl adipate, di-n-decyl adipate,
Aliphatic dibasic ester plasticizers such as diisodecyl adipate, di-2-ethylhexyl azelate, dibutyl sebacate, di-2-ethylhexyl sebacate; tri-2-ethylhexyl trimellitate (TOTM), tri-n- Trimellitic ester plasticizers such as octyl trimellitate, tridecyl trimellitate, triisodecyl trimellitate, di-n-octyl-n-decyl trimellilate, tributyl phosphate, tricresyl phosphate (TCP) , Triphenyl phosphate, trixylyl phosphate, trioctyl phosphate, octyl diphenyl phosphate, cresyl diphenyl phosphate, tributoxyethyl phosphate, trichloroethyl phosphate, tris (2-chloropropyl) phosphate , Tris (2,3-dichloro-propyl) phosphate plasticizers such as phosphates;
Biphenyltetracarboxylic acid tetraalkyl ester plasticizers such as 2,3,3 ', 4'-biphenyltetracarboxylic acid tetraheptyl ester; Polyester polymer plasticizers; Epoxy plasticizers such as liquid epoxy resin; Chlorination Paraffin; chlorinated fatty acid esters such as alkyl pentachloride stearic acid;

The inorganic compound which improves the tracking resistance when used together with the epoxidized vegetable oil in the vinyl chloride resin composition of the present invention is magnesium carbonate or aluminum hydroxide, and commercially available ones can be used as they are. These may be used as a mixture. The addition amount of these inorganic compounds is 2 parts per 100 parts by weight of the vinyl chloride resin.
The range is 5 to 150 parts by weight, preferably 30 to 100 parts by weight. If the amount is less than 25 parts by weight, the effect of tracking resistance cannot be said to be sufficient, and if it exceeds 150 parts by weight, a problem that mechanical properties such as tensile elongation are deteriorated tends to occur.

The vinyl chloride resin composition of the present invention may contain, as necessary, a stabilizer, an electric insulation improver such as clay, a filler such as calcium carbonate, a moldability improver such as an acrylic resin, and a lubricant. Various additives such as ultraviolet absorbers, antioxidants, antistatic agents, flame retardants, foaming agents, coloring agents, impact modifiers, etc., in the range that is normally used for vinyl chloride resins, and vinyl chloride resin compositions May be blended within a range that does not impair the physical properties of the composition. Further, a thermoplastic resin, synthetic rubber, or the like other than those described above may be added.

[0013] The vinyl chloride resin composition of the present invention is obtained by uniformly mixing each component such as the above-mentioned vinyl chloride resin, epoxidized vegetable oil, magnesium carbonate or aluminum hydroxide, and, if necessary, various additives such as a plasticizer. It is easily prepared by mixing or kneading. For mixing or kneading of each component, a normal mixer or kneader is used, and the composition is
It may be in the form of a powder or a pellet.

The vinyl chloride resin composition of the present invention can be produced by various molding methods such as extrusion molding, injection molding, inflation molding, rotational molding, press molding, and calendering. As a raw material of the material, it is effectively used as a material for vehicle interior / exterior materials and as a material for architectural interior / exterior materials. Further, the vinyl chloride-based resin composition of the present invention employs a molding method such as a co-extrusion method, an insert injection molding method, and a simultaneous injection molding method in which another resin or a metal is laminated in or near the die. The above-mentioned components may be manufactured by using the above method.

[0015]

EXAMPLES Next, the vinyl chloride resin composition of the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples unless departing from the gist thereof. The tracking resistance and tensile elongation of the vinyl chloride resin composition were evaluated as follows, and are shown in Table 1.

[0016]

[Table 1] Tracking resistance; measured according to the IEC (International Electrotechnical Commission) method. The evaluation was made by the number of drops of the NH ₄ Cl aqueous solution until a current of 0.5 A flowed for 2 seconds. Test piece 2 mm thick press sheet Conditions Applied voltage 380 V Electrolyte concentration NH ₄ Cl 0.1% aqueous solution Drop amount 20 mm ³ / time Drop interval 30 seconds Electrode material Brass Tensile elongation; Measured according to JIS K6723. No.2 test piece used. ：: elongation of 180% or more ×: elongation of less than 180% The criterion was elongation of 1 according to JIS K6723.
The target was 80% or more.

Examples 1 to 7, Comparative Examples 1 to 8 Vinyl chloride resin having an average degree of polymerization of 1300 (PVC, manufactured by Mitsubishi Chemical), epoxidized soybean oil (O-180P, manufactured by Asahi Denka), magnesium carbonate (manufactured by Kyowa Chemical) ), Aluminum hydroxide (Heidilite H42S, manufactured by Kyowa Chemical), trioctyl trimellitate (TOTM, manufactured by Mitsubishi Chemical), lead tribasic sulfate, lead stearate, calcium carbonate (Softon 1200, manufactured by Bihoku Powder Co., Ltd.) And clay (MC400,
The amount (parts by weight) shown in Table 1 was uniformly mixed in a beaker, then transferred to a 9-inch mill roll having a surface temperature of 160 ° C., and kneaded for 5 minutes to prepare a sheet. The sheet was further hot-pressed at 180 ° C. for 5 minutes,
mm and 1 mm sheets were prepared, and the former was subjected to a tracking resistance test, and the latter was subjected to a tensile elongation test. The results are shown in Table 1.

[0018]

[Table 2]

[0019]

[Table 3]

[0020]

The vinyl chloride resin composition of the present invention has excellent mechanical properties such as tracking resistance and tensile elongation by using epoxidized vegetable oil and magnesium carbonate or aluminum hydroxide in combination. Accordingly, the composition is suitably used as a material for covering electric wires and for molding electric equipment parts such as power plugs.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 91:00)

Claims (3)

[Claims] 1. A vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin, 20 to 70 parts by weight of an epoxidized vegetable oil, and 25 to 150 parts by weight of magnesium carbonate or aluminum hydroxide. 2. An electric wire covering material comprising the vinyl chloride resin composition according to claim 1. 3. A power plug made of the vinyl chloride resin composition according to claim 1.