JP2000344984A - Vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride-based resin composition having a small linear expansion coefficient, and excellent in heat shrinkage resistance, adhesion with another resin, especially with vinyl chloride resin and the smoothness of surface of its molded article. SOLUTION: This vinyl chloride-based resin composition contains 100 pts.wt. vinyl chloride-based resin having 400-5,000 average molecular weight, 0-50 pt.wt. plasticizer, 5-30 pt.wt. needle like filler and 5-50 pt.wt. plate like filler as main components. In this case, the needle like filler is preferably one kind of an asbestos, a wollastonite, potassium titanate, a xonotlite, a gypsum fiber, a glass fiber, a rock wool, magnesium sulfate, a phosphite fiber or their mixtures, and also the plate like filler is preferably a talc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vinyl chloride resin having a low coefficient of linear expansion, excellent heat shrinkage resistance, excellent adhesiveness with other resins, especially a vinyl chloride resin, and excellent surface smoothness of a molded article. It relates to a resin composition. In particular, the present invention relates to a resin composition suitable for molding a core material of an exterior molding of an automobile.

[0002]

2. Description of the Related Art For example, in the past, moldings made of metal as a core material and coated with a soft vinyl chloride resin composition have been widely used for exterior moldings of automobiles. , Metal hardness (JIS A type)
More and more molded articles have been used in place of 90 or more vinyl chloride resin compositions.

Here, a general vinyl chloride resin composition is inferior in linear expansion coefficient and heat shrinkage resistance as compared with metal, and therefore, for the purpose of improving these drawbacks, a plate-like filler such as talc or a needle-like filler is generally used. Is used. The vinyl chloride resin compositions used for these core materials have problems in their composition, such as lack of flexibility, poor weather resistance, and difficulty in toning.

[0004] Therefore, other vinyl chloride resin compositions generally having excellent flexibility, weather resistance, and toning properties are used as a two-layer or three-layer structure as a skin material or a lip material.
However, in general, the plate-like filler itself has a property of peeling off the surface layer, and the filler present on the surface of the core material peels off the surface layer, causing the peeling of the skin material and the lip material laminated on the core material surface. there were. The needle-shaped filler is excellent in adhesion to the laminated material, but has a problem that the surface of the molded article becomes rough and lacks smoothness.

[0005]

DISCLOSURE OF THE INVENTION The present invention has a small linear expansion coefficient, excellent heat shrinkage resistance, excellent adhesion to other laminated resins, particularly soft vinyl chloride resin, and a smooth molded product surface. It is an object of the present invention to provide a good vinyl chloride resin composition, for example, suitable as a core material for an exterior molding of an automobile.

[0006]

According to the present invention, an average degree of polymerization of 4 is provided.
100 to 500 parts by weight of a vinyl chloride resin of from 0 to 5000, a plasticizer of 0 to 50 parts by weight, a needle-like filler of 5 to 30 parts by weight and a plate-like filler of 5 to 50 parts by weight as a main component, or 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 400 to 5000, 0 to 50 parts by weight of a plasticizer, 5 to 30 parts by weight of an acicular filler, and 5 to 50 parts by weight of a plate-like filler. Has an average degree of polymerization of 400 to
100 parts by weight of 5,000 vinyl chloride resin, 10 plasticizers
The present invention provides a molding material for an automobile exterior, which is obtained by laminating a skin material mainly containing up to 200 parts by weight. Hereinafter, the present invention will be described in more detail.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The vinyl chloride resin as a base of the vinyl chloride resin composition of the present invention includes vinyl chloride homopolymer and comonomers copolymerizable with vinyl chloride such as vinyl acetate, acrylonitrile, vinylidene chloride, and the like.
Copolymers with ethylene, vinyl ether, maleic acid, maleic anhydride, acrylate and the like are used. The average degree of polymerization of these vinyl chloride resins is 400 to 5000, preferably 500 to 3500. The plasticizer used is not particularly limited, and any plasticizer that is commonly used for vinyl chloride resins can be used.

Specifically, dioctyl phthalate (DO)
P), phthalate plasticizers such as dibutyl phthalate, dihexyl phthalate, diisononyl phthalate (DINP), diisodecyl phthalate, or phthalic esters of higher alcohols having about 11 to 13 carbon atoms, dioctyl adipate, didecyl adipate, diisononyl adipate , Dioctyl azelate, dibutyl sebacate, dioctyl sebacate, etc., fatty acid dibasic ester plasticizers, trioctyl trimellitate, tridecyl trimellitate, triisodecyl trimellitate, etc. trimellitate plasticizers 1,2,3,3 ', 4-biphenyltetracarboxylic acid-based plasticizers, aliphatic dibasic acids such as adipic acid and sebacic acid, aromatic dibasic acids such as phthalic acid, and 1,2-propanediol; 2-butanediol, 1,3-buta Polyester plasticizers obtained by esterifying aliphatic glycols such as diols, 1,4-butanediol, 1,6-hexanediol, etc., and epoxy plastics such as epoxidized soybean oil, epoxidized linseed oil, and liquid epoxy resin. And chlorinated fatty acid esters such as chlorinated paraffin and alkyl pentachloride stearic acid, and phosphate esters such as tricridyl phosphate, cresyl phenyl phosphate and triphenyl phosphate. These plasticizers may be used alone or in combination of two or more. The amount used is 0 to 50 parts by weight based on 100 parts by weight of the vinyl chloride resin. If it is added in an amount of 50 parts by weight or more, the hardness of the core material may be impaired, and the amount is preferably 35 parts by weight or less.

The needle-like filler which is an essential component of the vinyl chloride resin composition of the present invention and which produces excellent characteristics as a core material of an exterior molding of an automobile is asbestos, wollastonite (wollastonite), titanic acid Potassium, zonotolite, gypsum fiber, rock wool, magnesium sulfate, phosphite fiber and the like can be mentioned. The amount of these needle fillers is 5 parts by weight per 100 parts by weight of the vinyl chloride resin.
-30 parts by weight, preferably 5-20 parts by weight. If the amount is less than 5 parts by weight, the effect of improving the coefficient of linear expansion is insufficient. If the amount exceeds 30 parts by weight, the smoothness of the surface of the molded article is easily impaired.

The amount of talc as the plate-like filler is 5 to 50 parts by weight, preferably 5 to 30 parts by weight, based on 100 parts by weight of the vinyl chloride resin. If the addition amount is less than 5 parts by weight, the effect of improving the coefficient of linear expansion is insufficient, and if it is added in an amount of 30 parts by weight or more, the adhesiveness to the laminated soft vinyl chloride resin tends to decrease.

In addition to the above-mentioned components, the vinyl chloride resin composition of the present invention may contain, if necessary, a plate-like filler, various stabilizers, an antioxidant, and an ultraviolet absorber as long as the physical properties of the composition are not impaired. Various additives such as a flame retardant, an antistatic agent, a coloring agent, a foaming agent, and an impact modifier, and a thermoplastic resin or a rubber other than the above-described thermoplastic resin can be appropriately compounded.
In particular, as a preferred embodiment of the present invention, the surface of the core material containing the needle-like filler and the plate-like filler has an average degree of polymerization of 4
An automobile exterior molding material in which a skin material mainly composed of 100 to 5000 parts by weight of a vinyl chloride resin of 100 to 5000 and a plasticizer of 10 to 200 parts by weight is laminated.

As the vinyl chloride resin used for the skin material, vinyl chloride resin used for the above-mentioned core material such as a vinyl chloride homopolymer and a comonomer copolymerizable with vinyl chloride is used. The average degree of polymerization of these vinyl chloride resins is 400 to 5000. As the plasticizer used, a plasticizer used for the above-mentioned core material such as dioctyl phthalate (DOP) is used alone or in combination of two or more. The amount used is 100 vinyl chloride resin.
It is 10 to 200 parts by weight based on parts by weight. The content is preferably 10 to 130 parts by weight in consideration of workability and weatherability.

The skin material of the present invention may further comprise various stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, flame retardants, as required, in addition to the above components, as long as the physical properties of the composition are not impaired. Various additives such as an antistatic agent, a foaming agent, a coloring agent, and an inorganic filler (calcium, silica, aluminum, magnesium, etc.), and a thermoplastic resin or rubber other than the above-described thermoplastic resin are appropriately compounded. can do. In addition, in order to maintain weather resistance in consideration of the use of the skin material, an ultraviolet absorber is used in an amount of 0.1%.
It is preferred to mix more than one part. As the ultraviolet absorber used, benzophenone type, benzotriazole type,
Salicylate, diphenyl acrylate, and benzoate ultraviolet absorbers may be mentioned, and these may be used alone or in combination of two or more.

[0014]

The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to these examples. Example Core Material 100 parts by weight of vinyl chloride resin having an average degree of polymerization of 1100, 3 parts by weight of epoxidized soybean oil, and phosphite-based chelator 1
Parts by weight, 2 parts by weight of a Ba / Zn composite stabilizer, 0.3 parts by weight of stearic acid and 1 part by weight of an acrylic resin (P-530, manufactured by Mitsubishi Rayon Co., Ltd.) and the amounts shown in Table 1 (parts by weight) Of DINP, needle-like filler (Wollastonite Under (manufactured by Maruo Calcium Co., Ltd.)) and talc (average particle size: 5 μm) and sufficiently stirred with a stainless steel stirrer in a 500 cc stainless steel beaker. ,
Kneading for 5 minutes with a 9 inch roll with a surface temperature of 165 ° C,
It is made into a sheet, and this sheet is pressed at 180 ° C. for 5 minutes,
A press sheet having a thickness of 2 mm was prepared. About the obtained sheet, the linear expansion coefficient and the adhesiveness with a skin material were evaluated.

Skin material 100 parts by weight of vinyl chloride resin having an average molecular weight of 1300
70 parts by weight of INP, 3 parts by weight of epoxidized soybean oil, 0.5 parts by weight of phosphite-based chelator, 2 parts by weight of Ba / Zn-based composite stabilizer, 0.3 parts by weight of stearic acid, and 10 parts by weight of calcium carbonate (CaCO ₃ ) A 1 mm-thick press sheet was prepared under the same conditions as the above-mentioned core material, and was subjected to the evaluation of the adhesion to the core material.

<Coefficient of linear expansion> A 2 mm thick press sheet of the vinyl chloride resin composition as the core material was used to obtain 2 mm ×
A 2 mm × 20 mm prismatic sample was cut out and used as a test piece. The test was measured by a compression load method using a thermomechanical analyzer (manufactured by Rigaku Denki Co., Ltd.). Judgment: ○ Linear expansion coefficient 7 × 10 ^-5 / ° C or less Practical level × Linear expansion coefficient 7 × 10 ^-5 / ° C or more Not practical

<Adhesiveness> The above-mentioned press sheets for the core material and the skin material are superimposed on each other to form 180 mm using a 3 mm thick frame.
° C., 1.5 min, and re-pressed at 150 kg / cm ^2. The adhesive strength of the sheet was evaluated by measuring the peel strength between the core material and the skin material using an autograph. The test is JIS K685
4 (T type peeling test).

<Smoothness of Molded Product Surface> Square rolled pellets were prepared from a roll sheet prepared under the same conditions as the core material described above using a pelletizer, and the pellets were extruded to evaluate the surface condition of the molded product. Extrusion conditions Extruder 20 mm machine. Screw full flight dice 1mm thick. Two width 10mm mesh 80 mesh ×, screw rotation 40 rpm C ₁ C ₂ adapter die set temperature 150 ℃, 160 ℃, 170 ℃ , 180 ℃ judgment: ○ surface smoothness practical level × surface smoothness impractical

[0019]

[Table 1] * -1 Good material fracture, good adhesion, material destruction during test

[0020]

When the vinyl chloride resin composition obtained by the present invention is used as a core material and another resin, especially a soft vinyl chloride resin is formed on the surface and laminated, excellent adhesiveness with the other resin is obtained. Because of this, there is no danger of failure due to peeling, the coefficient of linear expansion is small, the heat shrinkage is excellent, and the molded product surface is smooth and good. The product can be manufactured, and in particular, an excellent automobile exterior molding can be provided at low cost.

Continued on front page F-term (reference) 4J002 BD041 BD051 BD061 BD081 BD091 BD101 CD012 CD162 DE187 DG047 DG057 DJ007 DJ027 DJ048 DL007 EB026 EH026 EH086 EH146 EW046 FA018 FA047 FA077 FD017 FD018 FD022 FD026 GN00

Claims (4)

[Claims] 1. Main components are 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 400 to 5000, 0 to 50 parts by weight of a plasticizer, 5 to 30 parts by weight of a needle filler, and 5 to 50 parts by weight of a plate-like filler. Vinyl chloride resin composition. 2. The polyvinyl chloride according to claim 1, wherein the acicular filler is one of asbestos, wollastonite, potassium titanate, zonotolite, gypsum fiber, glass fiber, rock wool, magnesium sulfate, phosphite fiber or a mixture thereof. -Based resin composition. 3. The vinyl chloride resin composition according to claim 1, wherein the plate-like filler is talc. 4. Main components are 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 400 to 5000, 0 to 50 parts by weight of a plasticizer, 5 to 30 parts by weight of needle-like fillers, and 5 to 50 parts by weight of plate-like fillers. The average degree of polymerization is 400 to 500 on the surface of the core material.
0, 100 parts by weight of a vinyl chloride resin, and a plasticizer 10 to 20
An exterior molding material for automobiles, characterized in that a skin material mainly containing 0 parts by weight is laminated.