JPH11189691A - Vinyl chloride resin composition and molded article prepared therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride resin compsn. which gives a woodgrain- patterned, integrally molded article, simplifying an extrusion process, fully realizes a woodgrain pattern even when a high kneader is used, and has been improved in realization of a woodgrain pattern. SOLUTION: This compsn., capable of forming a woodgrain pattern, is prepd. by mixing 100 pts.wt. vinyl chloride resin with 0.1-30 pts.wt. mixture prepd. by mixing pts.wt. vinyl chloride resin, 0.001-10 pts.wt. pigment, and 0.5-20 pts.wt. lead silicate coprecipitated with silica gel. The compsn. is melt molded to give a woodgrain-patterned molded vinyl chloride resin article.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition having a woodgrain pattern, and more particularly, to improving the melt viscosity of a vinyl chloride resin mixture for imparting a woodgrain pattern to a vinyl chloride resin. More particularly, the present invention relates to a vinyl chloride resin composition having a wood grain pattern improved in the appearance of a wood grain pattern and a molded product obtained by melt-molding the vinyl chloride resin composition.

[0002]

2. Description of the Related Art In recent years, there has been a trend in which a wood grain pattern similar to wood is preferred as a material for building interiors, for example, by using a wood substitute material for a window frame, a door frame, a floor, a ceiling, a stair railing, and the like. ing. Also, as for the exterior material, there is an increasing demand for exterior materials for houses and the like having a pattern similar to wood by attaching a wood pattern material. Therefore, many attempts have been made to obtain molded articles having a grain pattern by using a hard synthetic resin as a substitute for wood. For example, as a method of imparting the grain pattern, the molded article main body and the molded article surface are divided, the molded article surface layer is made of a synthetic resin film or sheet, and the film or sheet and the molded article body are extrusion-laminated. A lamination process is performed by a laminating process by a method such as a wet method, a dry method, a hot melt method, and a coextrusion method to obtain a synthetic resin molded article having a grain pattern. However, this method requires a laminating step for performing lamination as described above, in addition to the normal extrusion step, and has a problem that the extrusion step becomes complicated and the extrusion cost increases.

[0003] As a means for solving this problem, there is a technique in which two types of vinyl chloride resin mixtures are mixed and melt-molded to obtain an integrally molded article having a wood grain pattern. This is achieved by mixing a vinyl chloride-based resin mixture containing a wood-colored pigment, which is used as a base material of a molded article, with a vinyl chloride-based resin mixture containing a wood-grain-colored pigment for the purpose of imparting a grain, by about several percent. Extrusion molding is performed by charging through the mouth or vent. In this case, a wood pattern appears in a low kneader such as a single screw extruder, but in a high kneader such as a twin screw extruder, a vinyl chloride resin mixture for a base and a vinyl chloride resin for imparting a wood pattern are provided. There is a problem that the resin mixture is completely melt-mixed and the grain pattern of the extruded product does not appear at all.

[0004]

An object of the present invention is to provide an integrally molded article having a wood grain pattern without the need for a laminate specification, in addition to the wood grain pattern which is a problem in the above-mentioned conventional method. Can simplify the extrusion process, and even when a high kneading machine is used, the grain pattern is sufficiently developed, and the grain pattern-imparted vinyl chloride resin composition in which the grain pattern is improved and a molded product thereof. Is provided.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, have found that a vinyl chloride resin mixture containing a pigment and a silica gel co-precipitated lead silicate having improved grain appearance has been developed. By obtaining the woodgrain pattern as an integrally molded article, the extrusion process can be simplified, and a woodgrain-patterned vinyl chloride resin composition and a molded article thereof can be provided.

That is, the present invention relates to a vinyl chloride resin 10
0 parts by weight, 100 parts by weight of a vinyl chloride resin, 0.001 to 10 parts by weight of a pigment, and 0.1% by weight of silica gel coprecipitated lead silicate.
1 to 20 parts by weight of a vinyl chloride resin mixture
1 to 30 parts by weight of a vinyl chloride resin composition having a wood grain pattern. Further, the present invention is a wood grain-patterned vinyl chloride resin molded product obtained by melt-molding the wood grain-patterned vinyl chloride resin composition.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, in a method of adding a vinyl chloride resin mixture for imparting a wood pattern to a vinyl chloride resin for a base in order to impart a wood pattern, the grain pattern is extruded. The expression of the grain pattern was different depending on the type of the grain, and it was agreed that the grain pattern was expressed or not. In addition, the extrusion condition in which the grain pattern appears is often pinpoint, and the extrusion condition is changed each time to search for a condition in which the grain pattern is likely to appear. However, by adding a pigment and silica gel coprecipitated lead silicate to the above-mentioned vinyl chloride resin mixture for imparting a grain pattern, a grain pattern can be imparted stably.

In the present invention, vinyl chloride resins used for a matrix and for imparting a grain pattern include vinyl chloride homopolymers, copolymers of vinyl chloride and other monomers, and vinyl chloride and other polymers. And chlorinated products of the above-mentioned homopolymers, copolymers and graft copolymers. The polymerization degree of these vinyl chloride resins is usually about 400 to 3000, preferably 50 to 3000.
It is 0 to 2500, more preferably 700 to 2000. If the degree of polymerization is less than 400, the strength when formed into a molded product is insufficient, and if it exceeds 3000, the moldability deteriorates.

Furthermore, in addition to these vinyl chloride resins, crosslinked vinyl chloride resins can also be used. The degree of polymerization of the crosslinked vinyl chloride resin is usually 400 to 60.
About 00, preferably 600 to 4000,
More preferably, it is 700 to 2500. The cross-linked vinyl chloride resin generally has a degree of cross-linking of 10% or more, and mostly about 30%.

In the case of a vinyl chloride homopolymer, its production is carried out by a conventionally known polymerization method, such as suspension polymerization. These are easily available on the market, for example, TH-500 and TH-500 manufactured by Taiyo PVC Co., Ltd.
-600, TH-700, TH-800, TH-100
0, TH-1300, TH-1400, TH-170
0, TH-2000, etc., and the degree of polymerization is 500, 600, 700, 800, 1000, 1
300, 1400, 1700, and 2000.

When the vinyl chloride copolymer is, for example, an ethylene-vinyl chloride copolymer or a vinyl acetate-vinyl chloride copolymer, the production thereof is carried out by a conventionally known polymerization method, such as suspension polymerization. No. These ethylene-vinyl chloride copolymers are easily available on the market, for example, TE-6 manufactured by Taiyo PVC Co., Ltd.
50, TE-800, TE-1050, TE-130
0, TE-1700, etc., and the degree of polymerization is 650, 780, 1050, 1300, 1700, respectively.
It is. Also, as a vinyl acetate-vinyl chloride copolymer, for example, there is TV-800 manufactured by Taiyo Vinyl Co., Ltd., and the degree of polymerization is 780, and these can be easily obtained in the market.

Next, a vinyl chloride graft copolymer obtained by graft copolymerizing vinyl chloride is, for example, an alkyl acrylate and / or an alkyl having a two-time transition point of -10 ° C. or less when a homopolymer is obtained. 70 to 99 parts by weight of methacrylate and polyfunctional monomers 1 to 3
Examples thereof include vinyl chloride graft copolymers obtained by graft copolymerizing 70 to 99 parts by weight of vinyl chloride with 0 parts by weight, and these can be used alone or in combination of two or more.

These vinyl chloride-based graft copolymers are easily available on the market. For example, TA-I200, TA-I100, and TA-I manufactured by Taiyo PVC Co., Ltd.
E200, TA-E230 and the like can be used, and the degree of polymerization is 500, 700, 1000, and 1300, respectively.

Chlorinated vinyl chloride resins include, for example, chlorinated polyvinyl chloride, which are readily available on the market. For example, H-305, H-305 and H-305 manufactured by Kanegafuchi Chemical Industry Co., Ltd. -526, H-829 and the like can be used, and the polymerization degrees are 500, 600, and 900, respectively, and the chlorine contents are 63%, 65%, and 68%, respectively.

The crosslinked vinyl chloride resin particularly contributes to the appearance of a grain pattern when used as a vinyl chloride resin for imparting a grain pattern, and when used in combination with silica gel coprecipitated lead silicate described below, the grain pattern is reduced. Produces a synergistic effect on the expression of In particular, those having a degree of crosslinking of 30% or more of the crosslinked vinyl chloride resin are preferable in order to improve the appearance of the grain pattern. This crosslinked vinyl chloride resin is easily available on the market, for example, SD7 manufactured by Chisso Corporation.
E, SD10E, SD13E, SD7X, SD10X and GR800T, GR1300 manufactured by Shin-Etsu Chemical Co., Ltd.
T, GR 2500T and the like can be used, and their degrees of polymerization are 700, 1000, 1300, 750, 1
000, 800, 1300 and 2500.

As described above, the vinyl chloride resin includes the above-described vinyl chloride homopolymer, vinyl chloride copolymer, vinyl chloride graft copolymer, chlorinated vinyl chloride resin,
Crosslinked vinyl chloride resins and the like can be mentioned, each of which can be used alone, or two or more of these can be used in combination by a generally known method. Any of the vinyl chloride resins in the vinyl chloride resin mixture for imparting grain can be used. Here, for convenience, the vinyl chloride resin for the base is hereinafter referred to as a vinyl chloride resin (A), and the vinyl chloride resin for imparting a grain pattern is referred to as a vinyl chloride resin (B).

The pigment used in the present invention is used by being added to a vinyl chloride resin, and specific examples thereof are roughly classified into organic pigments and inorganic pigments. As organic pigments, flame-retardant azo lakes having an azo group as a chromophore in the molecule, soluble azo lakes, insoluble azo lakes, insoluble azos, condensed azos, azo-based compounds such as azo chelates, and chemical components such as copper phthalocyanine and chlorinated copper phthalocyanine. And a phthalocyanine type such as phthalocyanine blue and phthalocyanine green, and a threne type based on anthraquinone having excellent heat resistance, light resistance and solvent resistance. Examples of the inorganic pigments include titanium oxide, a white inorganic pigment having excellent heat resistance, light resistance, and concealing properties, and a reddish inorganic pigment having iron oxide as a main component, a reddish inorganic pigment, a black carbon black, and a composite oxide. Examples thereof include titanium (yellow), zinc-iron (brown), copper-chromium (black), and copper-iron-manganese (black).

In order to impart a grain pattern to these pigments, it is preferable to use a dark pigment such as brown, red, black, yellow, or blue tones, and these are easily available on the market. P-4710 Black, FV-0110 Black, EP-4121 Red, FV-0122 Red, P-4440 Yellow, P-4910 Violet, PVFV0151 Yellow, PVFV0110 Black, PVFV0122 Blue, etc. manufactured by Dainichi Seika Kogyo Co., Ltd. In the case of toning, each pigment is used alone or in combination of two or more.

These pigments are added in an amount of 0.0 to 100 parts by weight of the vinyl chloride resin (B) for imparting a grain pattern.
It is added in an amount of from 0.01 to 10 parts by weight, and the amount of addition can be increased or decreased according to the required color. Here, as a method for incorporating the pigment into the vinyl chloride resin (B), a known method of mixing a resin (in the same manner as a method for obtaining a composition described later) is generally used.

The silica gel coprecipitated lead silicate used in the present invention is a white-yellow fine powder of an inorganic lead compound.
The ratio of O and SiO ₂ is 85:25 (PbO is 85 ± 1.
5%), has a PbSiO ₃ .SiO ₂ structure, and has a particle size of 95% or more when the particle size is 44 μm or less, and is generally used as a heat stabilizer for a vinyl chloride resin. In particular, it exhibits excellent heat stability, heat aging resistance, and bleed resistance with respect to a soft vinyl chloride resin compounded with a polyester plasticizer that requires high heat resistance. But,
In the present invention, it has been confirmed that not only the contribution of the vinyl chloride-based resin as a heat stabilizer but also an excellent effect on exhibiting a grain pattern of a molded article of the vinyl chloride-based resin is exerted.

Factors that cause this grain pattern to appear are:
When the silica gel coprecipitated lead silicate is added to the vinyl chloride resin (B) for imparting a wood grain pattern, the melt viscosity of the vinyl chloride resin mixture increases significantly, and the vinyl chloride resin (A) And a certain difference in viscosity is generated. This difference in viscosity is due to the fact that even when the vinyl chloride-based resin (A) and the vinyl chloride-based resin mixture are mixed and extruded, the mixture is completely melt-mixed and does not form a uniform colored product. Remains as a grain pattern in the extrusion flow direction.

This silica gel coprecipitated lead silicate is easily available on the market, for example, STABINEX S-5 manufactured by Mizusawa Chemical Industry Co., Ltd. The amount of addition is 0.5 to 20 parts by weight, preferably 1 part by weight, per 100 parts by weight of the vinyl chloride resin (B) for imparting a grain pattern.
To 15 parts by weight, more preferably 2 to 10 parts by weight. When the number of added parts is less than 0.5 part by weight, the effect of increasing the melt viscosity, which is a factor for imparting the grain pattern, is small, and the expression of the grain pattern is low. If the amount is more than 20 parts by weight, the melt viscosity becomes too high, and the moldability decreases, and a good grain pattern cannot be obtained.

The amount of the pigment and the vinyl chloride resin mixture containing silica gel coprecipitated with lead silicate is 0.1 to 30 parts by weight based on 100 parts by weight of the vinyl chloride resin (A).
Parts by weight, preferably 0.3 to 20 parts by weight,
More preferably, it is 0.5 to 15 parts by weight. When the amount is less than 0.1 part by weight, the grain pattern does not clearly appear, and when the amount exceeds 30 parts by weight, the grain pattern overlaps, and the grain pattern merely added does not appear.

In the present invention, the vinyl chloride resin composition obtained by the method described below may be used in combination with other generally used stabilizers, lubricants, plasticizers, processing aids, antioxidants, ultraviolet absorbers, pigments and fillers. As an additive for special applications, a foaming agent for imparting foam, a cellulose powder for imparting a woody feel, a cashew nut shell oil-modified phenolic resin, and the like can be used as necessary. It is readily available.

The stabilizer mentioned here is easily available on the market, for example, lead white, tribasic lead sulfate, dibasic lead phosphite, dibasic lead phthalate, tribasic maleic acid. Lead-based stabilizers such as lead acid and lead stearate, metal soaps such as magnesium stearate, calcium stearate, calcium laurate, barium stearate and barium laurate, and metal salts such as barium / zinc and calcium / zinc. In addition, a hydrotalcite compound having excellent thermal stability, transparency, electrical properties, and the like can be used as a nontoxic stabilizer.

Examples of the lubricant include hydrocarbons such as liquid paraffin, paraffin wax and synthetic polyethylene wax, fatty acids such as stearic acid, behenic acid and 12-hydroxystearic acid, zinc stearate, calcium stearate, magnesium stearate and the like. Metal soap, glycerin monostearate, distearyl phthalate, glycerin monooleate, butyl stearate,
Examples thereof include esters such as stearic acid monoglyceride and hardened oil, and higher alcohols such as stearic alcohol. These can be used alone or in combination of two or more.

Examples of the plasticizer include phthalic acid-based phthalic acid such as di-2-ethylhexyl phthalate and diisononyl phthalate;
Epoxy type such as epoxidized soybean oil, epoxidized fatty acid butyl, etc., aliphatic dibasic acid ester type such as di2ethylhexyl adipate and diisononyl adipate, and polyester type comprising a polycondensation compound of the above aliphatic dibasic acid and glycol , Chlorinated paraffin, tricresyl phosphate, phosphate esters such as triphenyl phosphate,
Trimellitic acid esters such as tri-2-ethylhexyl trimellitate and triisodecyl trimellitate can be used. These can be used alone or in combination of two or more.

Examples of the processing aid include polymethyl methacrylate (PMMA).

Antioxidants are broadly classified into, for example, phenolic, sulfuric, and phosphoric acid-based. In particular, phenols are often used, for example, n-octadecyl-3-.
(3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate, tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanate, and the like.

Examples of the ultraviolet absorber include benzophenone ultraviolet absorbers such as 2-hydroxy-4-methoxybenzophenone and 2-hydroxy-4-n-octylbenzophenone.

Examples of the pigment include titanium oxide, red iron oxide, graphite, carbon black, carbon white, lithopone and the like. Among them, titanium oxide is mainly used.

Examples of fillers include calcium carbonate, clay, hydrous silicic acid, anhydrous silicic acid, calcium silicate, aluminum silicate asbestos powder, antimony oxide, talc, aluminum trihydrate, hydrated zinc borate, magnesium oxide, sodium bicarbonate, and nitric acid. Examples thereof include potassium, calcium hydroxide, mica, and synthetic fluorine mica. Among them, calcium carbonate is preferably used.

In addition, a flame retardant, an anti-chalking agent, an antistatic agent and the like can be used as required.

For the purpose of imparting foaming, the following foaming agents can be added and used. Examples of the foaming agent include p, p′-oxybis-benzenesulfonylhydrazide (OBSH) and azodicarbonamide (A
DCA), sodium hydrogen carbonate (NaHCO ₃ )
And the like. These can be used alone or in combination. These foaming agents include, for example, Cerbon SCP (NaHCO ₃ ) manufactured by Eiwa Chemical Co., Ltd., D
S-25 (ADCA + OBSH), cell microphone C1 (A
DCA) and the like. The total amount by weight of these foaming agents is 0.05 to 3.0 parts by weight, preferably 0.1 part by weight, per 100 parts by weight of the above-mentioned vinyl chloride resin composition.
1 to 1.5 parts by weight, more preferably 0.2 to 1.5 parts by weight.
1.0 part by weight. If the amount is less than 0.05 part by weight, there is no specific gravity reducing effect, and an improvement in the expansion ratio cannot be expected much.
If the amount exceeds 3.0 parts by weight, a high foaming state occurs, the strength of the molded article cannot be sufficiently maintained, and only an extremely limited molded article can be obtained, which causes a problem in molding workability.

The following cellulose powder and phenolic resin modified with cashew nut shell oil can be used for the purpose of imparting a woody feeling such as a feeling of touch and luster.

The raw materials for cellulose powder are wood,
Pulp or paper each alone or two of these
A mixture having a whiteness of 65 to 95% obtained by subjecting a mixture of more than two kinds to an acid or alkali hydrolysis treatment to remove impurities such as wood acid and lignin. These are easily available on the market, for example, a whiteness of 80 manufactured by Nippon Paper Industries Co., Ltd.
% (JIS P8123-61) 100 mesh pass KC Floc W-100, 200 mesh pass KC Floc W-200, and the like. The number of these added parts is 0.5 to 100 parts by weight, preferably 1 to 60 parts by weight, more preferably 2 to 40 parts by weight based on 100 parts by weight of the above-mentioned vinyl chloride resin composition. 0.5
If the amount is less than 100 parts by weight, the feeling of wood having a rough surface due to touch is small, and if it exceeds 100 parts by weight, the formability is significantly reduced.

As the cashew nut shell oil-modified phenolic resin, cardanol obtained by heat-treating a black-brown liquid (mainly composed of curdle and anacardic acid) contained in the shell of the ash tree nut of the lacquer anacardium plant may be used as a formaldehyde or the like. Novolak type cashew nut shell oil modified phenolic resin treated with acid, or resol type cashew nut shell oil modified phenolic resin treated with alkali as a catalyst, or has a crosslinked structure treated with other treatments Alkylphenol-based cured resin. These are easily available on the market, for example, Senlight Cashew Dust F manufactured by Tohoku Kako Co., Ltd.
F-1045, FF-1140, FF-1148, FF
-2090 and the like. The number of these additives is 0.5 parts per 100 parts by weight of the above-mentioned vinyl chloride resin composition.
To 100 parts by weight, preferably 1 to 60 parts by weight, and more preferably 2 to 40 parts by weight. If the number of added parts is less than 0.5 parts by weight, there is a slight woody feeling as if the surface was rough due to touch, but the woody feeling was small by visual inspection and 1
If the amount is more than 00 parts by weight, the moldability will be significantly reduced.

As described above, these additives are easily available on the market, are frequently used, and can be used or used in combination as needed.

As a method for obtaining the vinyl chloride resin composition of the present invention, a stabilizer, a lubricant, and, if necessary, other additives and a filler may be added to the above-mentioned vinyl chloride resin (A) for a base. Additives and the like, for example, Henschel mixer, Banbury mixer, stirring and mixing by a stirrer such as a ribbon blender as a compounded powder, or the obtained compounded powder, for example, conical twin screw extruder, parallel twin screw extruder, Single screw extruder, kneader type kneader,
It can be obtained as pellets granulated by a kneader such as a roll kneader. In the vinyl chloride resin mixture, a pigment and silica gel coprecipitated lead silicate, and if necessary, other additives and fillers are added to the vinyl chloride resin (B) for imparting a grain pattern. Can be obtained as compounded powder or pellets by the same method as that of the vinyl chloride resin for a base.

Using the above compounded powder or pellet,
A molded product can be obtained by melt molding with an extruder such as a conical twin-screw extruder, a parallel twin-screw extruder, or a single-screw extruder.

Also, a method of forming a wood pattern by extrusion molding is as follows.
It is necessary to add a vinyl chloride resin mixture to the parent vinyl chloride resin (A). This vinyl chloride-based resin mixture may be mixed with the vinyl chloride-based resin (A) in advance and then charged through the hopper port, or only the vinyl chloride-based resin mixture may be charged after the vent port.

When extruding a molded product having a wood grain pattern,
The vinyl chloride-based resin mixture does not sufficiently melt in the vinyl chloride-based resin (A), and uneven coloring due to a pigment occurs. Since the different color portion due to the uneven coloring flows in parallel with the extrusion direction, it can be made very close to a natural grain pattern.

[0043]

EXAMPLES The present invention will be described more specifically with reference to the following examples.

The pellets of the vinyl chloride resin composition obtained by melt extrusion were further extruded, and the obtained molded product was evaluated for grain pattern and moldability as follows. Molded products for evaluation are
Toyo Seiki Seisakusho Labo Plast Mill / Single Screw Extruder D2
0-25 and conical twin screw extruder 2D-20C type
The die is a slit die (W = 40mm, H = 1mm,
(L = 60 mm), and a ring breaker and a Hachinos breaker were used as the breakers to perform extrusion molding. The temperature of each cylinder was set to 140 to 160 ° C. and the die temperature was set to 18
0 ° C setting, screw rotation speed 20 rpm, width 40 m
m, a thickness of 1 mm and a length of 700 mm were obtained.
As for the grain pattern, the surface of the molded article was visually observed using the flat molded article described above. If the grain pattern appeared, a grain line appeared, and the grain pattern was evaluated based on the number of grain lines.
As a criterion for determining the grain pattern, the number of grain lines is
(1) When a single-screw extruder or a ring breaker is used, it is sufficient if there are six or more, and (2) a conical twin-screw extruder.
When a ring breaker was used, four or more were good, and when (3) a conical twin-screw extruder and a Hachinos breaker were used, one or more was good.

Regarding the moldability, it is considered that the moldability is poor if the torque or the resin pressure during molding is high.
It was also determined that the workability was poor even when the resin drift was large and the shape of the molded product was not uniform. The workability was comprehensively determined and the ranking was performed as follows. ○: good, ×: bad.

Example 1 An average degree of polymerization of 10 was used as the vinyl chloride resin (A) for the base.
00 vinyl chloride homopolymer (Taiyo Vinyl Co., Ltd., T
H-1000), 100 parts by weight, a one-pack additive of a lead-based stabilizer and a composite lubricant (manufactured by Mizusawa Chemical Industry Co., Ltd., S
6021-1) 6.5 parts by weight and 5 parts by weight of calcium carbonate as a filler were mixed in a Henschel mixer FM20B-FD20D / K manufactured by Mitsui Miike Koki Co., Ltd.
The obtained composition was granulated with a Labo Plastomill conical twin screw extruder 2D-20C manufactured by Toyo Seiki Seisaku-sho, Ltd. to obtain a vinyl chloride resin (A) as pellets. The results are shown in Table 1 (see also the following Examples and Comparative Examples).

On the other hand, in the vinyl chloride resin mixture,
100 parts by weight of a crosslinked vinyl chloride resin (SD10E, manufactured by Chisso Corp.) having an average degree of polymerization of 1000 was used as the vinyl chloride resin (B) for imparting a grain pattern, and 0.15 parts by weight of a blue pigment and yellow as a pigment were used. 0.55 parts by weight of pigment,
0.09 parts by weight of black pigment (manufactured by Dainichi Seika Kogyo Co., Ltd., PVFV0122 Blue, PVFV0151 Yellow, PVFV0110 Black), silica gel coprecipitated lead silicate (manufactured by Mizusawa Chemical Industry Co., Ltd .;
5) Except that 5 parts by weight were used, a composite lubricant, calcium carbonate, etc. were mixed and granulated in the same manner as in the above-mentioned vinyl chloride resin (A) for a base, and a vinyl chloride resin mixture was obtained as pellets. . The composition is shown in Table 2 (see also the following Examples and Comparative Examples).

One hundred parts by weight of the vinyl chloride resin (A) pellet obtained above was mixed with 1 part by weight of a vinyl chloride resin mixture pellet, and a lab plast mill / single screw extruder manufactured by Toyo Seiki Seisaku-sho, Ltd. Using a D20-25C type, a ring breaker as a breaker, and a slit die (W = 40 mm, H = 1 mm, L = 60 mm) as a die, set the cylinder temperature to 140-160 ° C. and the die temperature to 180 ° C. A flat molded product having a width of 40 mm, a thickness of 1 mm, and a length of 700 mm was obtained at a screw rotation speed of 20 rpm. This flat molded product was evaluated for the grain pattern and the forming characteristics as described above. Also, as an extruder,
A molded product was obtained and evaluated using a Labo Plastomill conical twin screw extruder 2D-20C manufactured by Toyo Seiki Seisaku-Sho, Ltd., using a ring breaker as a breaker, and the other conditions in the same manner as described above. Further, Labo Plastomill conical twin screw extruder 2D-20C manufactured by Toyo Seiki Seisaku-sho, Ltd.
The mold was used to obtain a molded article, which was evaluated in the same manner as described above, except that a hachinosling was used as a breaker. Table 3 shows the results.

Example 2 As a vinyl chloride resin (A), a vinyl chloride graft copolymer having an average degree of polymerization of 1000 (Taiyo Vinyl Co., Ltd.
AE 200) Molding was carried out in the same manner as in Example 1 except that 100 parts by weight were used, and each item was measured. Table 3 shows the results.

Example 3 As a vinyl chloride resin (A), a vinyl chloride graft copolymer having an average degree of polymerization of 1300 (Taiyo PVC Co., Ltd., T
AE 230) Molding was performed in the same manner as in Example 1 except that 100 parts by weight was used, and each item was measured. Table 3 shows the results.

Example 4 A vinyl chloride homopolymer having an average degree of polymerization of 1000 (manufactured by Taiyo Vinyl Co., Ltd., TH-10) was used as the vinyl chloride resin (B).
00) 100 parts by weight of a silica gel co-precipitated lead silicate (STABINEX S-5, manufactured by Mizusawa Chemical Industry Co., Ltd.) and 100 parts by weight of the vinyl chloride resin (A), Molding was performed in the same manner as in Example 1 except that 30 parts by weight of the mixture was mixed, and each item was measured.
Table 3 shows the results.

Example 5 As a vinyl chloride resin (B), a vinyl chloride graft copolymer having an average degree of polymerization of 1000 (Taiyo PVC Co., Ltd.
A-E 200) 100 parts by weight, silica gel coprecipitated lead silicate (manufactured by Mizusawa Chemical Industry Co., Ltd., STABINEX S-
5) 15 parts by weight of vinyl chloride resin (A) 10
Molding was performed in the same manner as in Example 1 except that 3 parts by weight of the vinyl chloride resin mixture was mixed with 0 part by weight, and each item was measured. Table 3 shows the results.

Example 6 As a vinyl chloride resin (A), a vinyl chloride graft copolymer having an average degree of polymerization of 1,000 (manufactured by Taiyo Vinyl Co., Ltd., T
AE 200) 100 parts by weight, and as a vinyl chloride resin (B), 50 parts by weight of a crosslinked vinyl chloride resin (SD10E, manufactured by Chisso Corporation) having an average degree of polymerization of 1000 and vinyl chloride having an average degree of polymerization of 1000 100 parts by weight of 50 parts by weight of a homopolymer (manufactured by Taiyo Vinyl Co., Ltd., TH-1000)
Using 0.6 parts by weight of a blue pigment as a pigment,
3.30 parts by weight of yellow pigment, 0.20 parts by weight of black pigment (PVFV0122 blue, PVFV0151 yellow, PVFV0110 black, manufactured by Dainichi Seika Kogyo Co., Ltd.), silica gel coprecipitated lead silicate (manufactured by Mizusawa Chemical Industry Co., Ltd.) And STABINEX S-5) were molded in the same manner as in Example 1 except that 1 part by weight and 0.3 part by weight of the vinyl chloride resin mixture were mixed with 100 parts by weight of the vinyl chloride resin (A). Then, each item was measured. Table 3 shows the results.

Comparative Example 1 A vinyl chloride homopolymer having an average degree of polymerization of 1000 (manufactured by Taiyo Vinyl Co., Ltd., TH-10) was used as the vinyl chloride resin (B).
00) 100 parts by weight, as a pigment 0.30 parts by weight of a blue pigment, 1.65 parts by weight of a yellow pigment, and 0.3 parts by weight of a black pigment.
15 parts by weight (PVFV012 manufactured by Dainichi Seika Kogyo Co., Ltd.)
2 blue, PVFV0151 yellow, PVFV011
0), 0.3 parts by weight of silica gel coprecipitated lead silicate (STABINEX S-5, manufactured by Mizusawa Chemical Industry Co., Ltd.) and 100 parts by weight of the vinyl chloride resin (A), The mixture was molded in the same manner as in Example 1 except that 3 parts by weight of the mixture was mixed, and each item was measured. When a conical twin-screw extruder was used and a Hachinos breaker was used as a breaker, no wood grain was formed. Not expressed. Table 3 shows the results.

Comparative Example 2 As a vinyl chloride resin (A), a vinyl chloride graft copolymer having an average degree of polymerization of 1,000 (Taiyo PVC Co., Ltd.
AE 200) 100 parts by weight, 100 parts by weight of a vinyl chloride homopolymer (TH-1000, manufactured by Taiyo Vinyl Co., Ltd.) having an average degree of polymerization of 1000 as the vinyl chloride resin (B), silica gel coprecipitated silica Using 25 parts by weight of lead (STABINEX S-5, manufactured by Mizusawa Chemical Industry Co., Ltd.)
Molding was performed in the same manner as in Example 1 except that 1 part by weight of the vinyl chloride-based resin mixture was mixed with 100 parts by weight of the vinyl chloride-based resin (A), and each item was measured. When used, grain lines appeared, but unmelted butter remained in addition to the grain lines, and the grain pattern could not be determined. In addition, the torque and resin pressure during extrusion molding were high, and there was a drift of the resin, resulting in poor moldability. Table 3 shows the results.

Comparative Example 3 A vinyl chloride homopolymer having an average degree of polymerization of 1000 (manufactured by Taiyo Vinyl Co., Ltd., TH-10) was used as the vinyl chloride resin (B).
00) 100 parts by weight, 5 parts by weight of tribasic lead sulfate (manufactured by Mizusawa Chemical Industry Co., Ltd., TCS) instead of silica gel coprecipitated lead silicate, and 100 parts by weight of vinyl chloride resin (A) On the other hand, molding was performed in the same manner as in Example 1 except that 15 parts by weight of the vinyl chloride resin mixture was mixed, and each item was measured. When a conical twin-screw extruder was used, regardless of the type of breaker, No grain streaks developed. Table 3 shows the results.

Comparative Example 4 Molding was carried out in the same manner as in Example 1 except that the amount of the vinyl chloride resin mixture was changed to 0.05 part by weight based on 100 parts by weight of the vinyl chloride resin (A), and each item was measured. As a result, irrespective of the type of the extruder, no grain streaks appeared. Table 3 shows the results.

Comparative Example 5 Molding was carried out in the same manner as in Example 1 except that the amount of the vinyl chloride resin mixture was 35 parts by weight based on 100 parts by weight of the vinyl chloride resin (A). Regardless of the type of the extruder, woodgrain streaks appeared, but the number of woodgrain streaks overlapped so much that the woodgrain pattern could not be determined. In addition, the torque and resin pressure during extrusion molding were high, and there was a drift of the resin, resulting in poor moldability. Table 3 shows the results.

[0059]

[Table 1]

[0060]

[Table 2]

[0061]

[Table 3]

[0062]

According to the method of the present invention, a grain pattern can be imparted to the surface of an extruded product regardless of the type of extruder and the extrusion molding conditions. It can provide a smooth grain pattern, greatly contributes to the development of applications, and is extremely advantageous in industry.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigenobu Ikenaga 1-6 Takasago, Takaishi-shi, Osaka Mitsui Chemicals, Inc.

Claims (2)

[Claims] (1) 100 parts by weight of a vinyl chloride resin,
100 parts by weight of vinyl chloride resin and pigments 0.001 to 10
Parts by weight and 0.1 to 30 parts by weight of a vinyl chloride resin mixture comprising 0.5 to 20 parts by weight of silica gel coprecipitated lead silicate,
A wood-grained vinyl chloride resin composition obtained by mixing. 2. A wood grain-patterned vinyl chloride resin molded product obtained by melt-molding the wood grain-patterned vinyl chloride resin composition according to claim 1.