JPH1149862A - Vinyl chloride-based resin composition for molded product having woodgrain pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of efficiently producing at low cost molded products with favorable woodgrain pattern without the need of using any special apparatus. SOLUTION: This composition comprises (A) 100 pts.wt. of a vinyl chloride- based resin, (B) 0.01-2.0 pts.wt. of a woodgrain-colored pigment's melt molding ground product to afford the woodgrain color of the aimed woodgrain pattern, 0.1-2.0 mm in average particle size and >=0.28 in the specific viscosity in the from of nitrobenzene solution (determined in accordance of the JIS K-6721 procedure), and (C) 0.1-5.0 pts.wt. of a dispersant-treated powdery base material- colored pigment to afford the base material color of the aimed woodgrain pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vinyl chloride resin composition for a molded article having a grain pattern.

[0002]

2. Description of the Related Art In general, a vinyl chloride resin molded article having a wood grain pattern is used as a decorative material inside and outside a house. The method for producing the resin composition is a resin composition having a hue necessary to form a desired wood grain pattern. Each separately, extruding by supplying a resin composition containing a base color pigment to form a wood pattern, collectively mixing and extrusion molding with a tumbler or the like installed in an extruder, There is a method of supplying a pigment having a woodgrain color from a supply port provided in the cylinder of the extruder. However, both methods have a problem that the manufacturing cost is increased due to the complicated structure of the extruder and the increase in the number of steps.

Further, a method of extruding a resin composition obtained by adding a wood grain pigment and a base color pigment necessary for forming a wood grain pattern to a resin at a time using an ordinary extruder is adopted. The pigment is evenly dispersed in the molded product,
A molded article having a good grain pattern cannot be obtained.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present inventors have developed a wood grain pattern that enables a molded article having a good wood grain pattern to be efficiently manufactured at low cost without using a special apparatus. Provided is a vinyl chloride resin composition for molded articles having the same.

[Means for Solving the Problems]

That is, the present invention provides (A) 100 parts by weight of a vinyl chloride resin, (B) an average particle diameter of 0.1 to 2.0 mm, and a specific viscosity of a nitrobenzene solution (measured according to JIS K-6721) of 0.
0.01 to 2.0 parts by weight of a melt-molded and ground product of a woodgrain color pigment that forms a woodgrain color, which is 28 or more, and (C) a dispersion-treated powdery base color pigment that forms a woodgrain base color
It is a vinyl chloride resin composition for a molded article having a grain pattern consisting of 0.1 to 5.0 parts by weight.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. Examples of the vinyl chloride resin used in the present invention include a vinyl chloride resin which is a homopolymer of a vinyl chloride monomer, and a copolymer of vinyl chloride as a main component and vinyl chloride and a monomer copolymerizable therewith. Is used. Examples of monomers copolymerizable with vinyl chloride include olefins such as ethylene and propylene; halogenated olefins other than vinyl chloride such as vinylidene chloride and vinyl fluoride; vinyl esters such as vinyl acetate and vinyl laurate; Alkyl vinyl ethers such as 2-ethylhexyl vinyl ether and dodecyl vinyl ether; acrylic acid such as acrylic acid, methyl acrylate and ethyl acrylate or esters thereof; methacrylic acid such as methacrylic acid, methyl methacrylate and 2-ethylhexyl methacrylate or the like; Esters; maleic acid or esters thereof; acrylic derivatives such as acrylonitrile; N- such as Nt-butylmaleimide and N-cyclohexylmaleimide.
Substituted maleimides are exemplified, and these are exemplified alone or in combination of two or more.

The vinyl chloride resin used in the present invention preferably has an average degree of polymerization of 700 to 1,300. If the average degree of polymerization is less than 700, the extruded product obtained has poor mechanical strength such as tensile strength and impact strength, and
If it exceeds 3, the melt viscosity of the resin at the time of extrusion molding becomes high, which adversely affects the surface properties of the obtained molded product, and a molded product having a good grain pattern cannot be obtained.

[0008] The wood grain pigment for forming the wood grain color (B) used in the present invention will be described below. Vinyl chloride resin having an average polymerization degree in the range of 700 to 1,300; (meth) acrylic resin having a weight average molecular weight of 300,000 or more, such as methyl acrylate, methyl methacrylate, and butyl acrylate; styrene, α-methylstyrene Aromatic compounds having a vinyl group such as glycerin;
A composition obtained by mixing one or more dispersants selected from aliphatic esters of polyhydric alcohols such as pentaerythritol and a pigment that forms a wood grain pattern with a three-roll mill or the like is melted. After kneading and molding, the mixture is pulverized with a hammer mill or the like to obtain a wood-colored pigment having a mean particle size of 0.1 to 2.0 mm. A (meth) acrylic resin having a weight average molecular weight of 300,000 or more is used as a dispersant. If the weight average molecular weight is less than 300,000, (B) and (C) are easily dispersed uniformly, and it is difficult to form a grain pattern. become. Average degree of polymerization of these 700 to 1,30
0 and a weight average molecular weight of 30
Preferred are (meth) acrylic resins of at least 10,000.

If the average particle size of the above-mentioned melt-molded and pulverized product is less than 0.1 mm, it is impossible to uniformly disperse and give wood grain streaks giving a woody feeling. If the thickness exceeds 2.0 mm, wood streaks can be developed, but the streaks become too large and impair the feeling of wood. The amount of the dispersant and the pigment contained in (B) is 3 to 90% by weight of the dispersant, 10 to 97% by weight of the pigment, preferably 3 to 35% by weight of the dispersant, and 65 to 97% by weight of the total amount of (B). %. When the content of the dispersant is less than 3% by weight, the pigments agglomerate with each other, so that the grain of the wood pattern becomes too large at the time of extrusion molding, thereby impairing the wood texture. On the other hand, if the content exceeds 90% by weight, the streaks appearing become thin and the wood texture is impaired.

[0010] The specific viscosity of the nitrobenzene solution in (B) must be 0.28 or more (measured according to JIS K-6721). If it is less than 0.28, the pigment is uniformly dispersed at the time of molding and no wood streaks are formed. The wood texture is impaired.

The pigments in (B) include phthalocyanine blue, phthalocyanine green, benzidine yellow, banza yellow, vulcan orange, chromophtal red, chromophtal yellow, quinacridrine,
Titanium oxide and the like are exemplified. Pigments may be used in combination of two or more as necessary.

In the present invention, (B) is added in the range of 0.01 to 2.0 parts by weight based on 100 parts by weight of the vinyl chloride resin. If the addition amount is less than 0.01 part by weight, the grain of wood forming the grain pattern of the obtained molded article becomes lighter, and the color of the base material forming the grain pattern becomes uniform, thereby forming a clear and good grain pattern. Goods are not obtained. Also, when this exceeds 2.0 parts by weight, the obtained grain pattern of the molded article is dark, and the shade between the grain color forming the grain pattern and the base color forming the grain pattern does not clearly appear, so that it is good. A molded product with a natural grain pattern cannot be obtained.

The dispersion-treated powdery base material color pigment (C) for forming the woodgrain base material color in the present invention will be described below. (C) is a powdery base material color pigment which has been subjected to a dispersion treatment to form a wood-grained base material color. The dispersion includes a metal soap such as calcium stearate and magnesium stearate and an inorganic filler such as calcium carbonate and talc. A base color pigment treated with a dispersant obtained by mixing one or more combination dispersants selected from agents and a pigment for forming a wood-grain base color is preferable.
The amount of the dispersant and the amount of the pigment contained in (C) are 5 to 15% by weight and 85 to 95% by weight, respectively, based on the total amount of (C). When the content of the dispersant is less than 5% by weight, the base color pigment forming the woodgrain pattern is not uniformly dispersed in the obtained extruded product, and the woodgrain appearance of the obtained molded product is impaired. If the content exceeds 15% by weight, problems such as plate-out occur at the time of extrusion molding, which impairs the appearance of the molded product.

As the pigment in (C), the pigments exemplified in (B) above are similarly used. These pigments may be used alone or in combination of two or more as needed. In the present invention, (C) is added within the range of 0.1 to 5.0 parts by weight based on 100 parts by weight of the vinyl chloride resin. When the addition amount is less than 0.1 part by weight, the density of the base color forming the grain pattern of the obtained molded product becomes thin, and it is difficult to obtain a desired color tone. If the amount exceeds 5.0 parts by weight,
Plate-out tends to occur during extrusion molding, which impairs the appearance of the resulting molded article.

The vinyl chloride resin composition of the present invention may further comprise, if necessary, a stabilizer, a stabilizing aid, a lubricant, an inorganic filler, a plasticizer, in addition to the three components (A), (B) and (C). , A colorant, an ultraviolet absorber, an antioxidant, and the like. The stabilizer is not particularly limited as long as it is blended with a general vinyl chloride resin, and organic tin stabilizers such as laurate, malate, and mercaptides, Ca, B
There are metal soap stabilizers such as a and Pb, and lead stabilizers such as tribasic lead sulfate, lead silicate, and dibasic lead phosphite. These are used alone or in combination of two or more.

Examples of the stabilizing aid include epoxy compounds and the like. Examples of the lubricant include hydrocarbons such as paraffin wax and polyethylene wax; fatty acids such as palmitic acid and stearic acid; aliphatic alcohols such as stearyl alcohol; And ester of alcohol and partial ester of fatty acid and polyhydric alcohol.

Examples of the inorganic filler include calcium carbonate, titanium oxide, and talc. Of these, calcium carbonate is preferred, and any of heavy calcium carbonate and light calcium carbonate can be used. When emphasizing impact resistance, it is preferable to add a large amount of light calcium carbonate.

The vinyl chloride-based resin composition of the present invention comprising these components is mixed using a conventional means such as a high-speed mixer, and molded by extrusion to obtain a molded article having a desired shape.

[0019]

The present invention will be described more specifically with reference to the following examples, but the present invention is not limited thereto.

Preparation of (B) As shown in (Table 1), the respective components were mixed at respective mixing ratios (parts by weight).
Was mixed using a Henschel mixer to obtain a powder mixture. These powder mixtures a-1 to a-4, a-7 to a-9
Was melt-kneaded at 180 ° C. for 5 minutes using two rolls to form a sheet. The obtained sheet was pulverized using a hammer mill so that the average particle size became the particle size shown in (Table 1). The specific viscosity of the obtained melt-molded pulverized product was measured in accordance with JISK-6721 and is shown in Table 1. A-5 and a-6 are molten,
It is a mere powder mixture without kneading, molding and grinding.

[0021]

[Table 1]

Preparation of (C) As described in Table 2, each pigment and dispersant were blended at each blend ratio (parts by weight) using a Henschel mixer to obtain a powder mixture.

[0023]

[Table 2]

(Examples 1 to 6 and Comparative Examples 1 to 6) As described in Table 3, various additives were mixed at respective mixing ratios (parts by weight) using a Henschel mixer to obtain a mixture. The obtained mixture was formed into a sheet under the following extrusion conditions, and the grain pattern of the obtained molded article was visually observed, and its evaluation is shown in (Table 3). (Extrusion conditions) Extruder: 50 mmφ single screw extruder Setting: C ₁ = 140 ° C. C ₂ = 155 ° C. C ₃ = 170 ° C. C ₄ = 185 ° C. AD = 185 ° C. D ₁ = 180 ° C. D ₂ = 180 ° C. Screw CR = 2.0 Screw rotation speed = 20rpm Die = 2mmt × 40mmw flat plate

[0025]

[Table 3]

[0026]

According to the present invention, there is provided a vinyl chloride resin composition capable of efficiently producing a molded product having a good grain pattern at low cost without using a special apparatus.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 67/00 C08L 67/00 // B29C 47/00 B29C 47/00 B29K 27:06

Claims (4)

[Claims] (A) 100 parts by weight of a vinyl chloride resin, (B) an average particle diameter of 0.1 to 2.0 mm, and a specific viscosity (measured value according to JIS K-6721) of a nitrobenzene solution of 0.28 or more. Melt molded pulverized product of wood grain color pigment forming wood grain color 0.01 to 2.0 parts by weight, (C) powdery base color pigment treated with dispersant forming wood grain base color 0.1 to 5.0 A vinyl chloride resin composition for molded articles having a grain pattern consisting of parts by weight. (B) a vinyl chloride resin having an average degree of polymerization of 700 to 1,300, and a (meth) resin having a weight average molecular weight of 300,000 or more.
One or more dispersants selected from an acrylic resin, an aromatic compound having a vinyl group, and a fatty acid ester of a polyhydric alcohol are contained in an amount of 3 to 90% by weight and a pigment in an amount of 10 to 97% by weight. The vinyl chloride resin composition for a molded article having a wood grain pattern according to claim 1. 3. 5 to 15% by weight of one or more dispersants wherein (C) is selected from metal soaps and inorganic fillers
3. A vinyl chloride resin composition for a molded article having a wood grain pattern according to claim 1 or 2, comprising 85 to 95% by weight of a pigment. 4. The vinyl chloride resin composition for a molded article having a wood grain pattern according to claim 1, wherein the vinyl chloride resin composition is for extrusion molding.