JPH10231405A - Vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride resin composition which can give a synthetic resin molding resembling natural wood in grain pattern and woody texture and is easily moldable and flexible. SOLUTION: This composition comprises 80-99wt.% composition (A) comprising 100 pts.wt. vinyl chloride resin (a) having an average degree of polymerization of 700-1,200, 25-60 pts.wt. liquid plasticizer, 10-100 pts.wt. wood flour having a water content of 5wt.% or below and an average particle diameter of 30-500μm and 1-10 pts.wt. acrylic processing aid having a weight-average molecular weight of 2,000,000-5,000,000 and 20-1wt.% composition (B) comprising 100 pts.wt. vinyl chloride resin (b) having an average degree of polymerization higher than that of resin (a) by 100-500, a liquid plasticizer in amount smaller than that used in composition A by 0-20 pts.wt. 10-100 pts.wt. wood flour having a water content of 5wt.% or below and an average particle diameter of 30-500μm, 1-10 pts.wt. acrylic processing aid having a weight-average molecular weight of 2,000,000-5,000,000 and 0.5-6 pts.wt. colored pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a vinyl chloride resin composition.

[0002]

2. Description of the Related Art In recent years, synthetic resin molded articles have been given a wood grain pattern and a woody feel of natural wood to have a color tone and texture close to that of natural wood, and have been used for interior materials for vehicles, side moldings, interior materials for houses, Attempts have been made to use it for handrails, table frames, gaskets and the like coated on steel pipes. For example, Japanese Patent Publication No. 62-41612 discloses that a vinyl chloride-vinyl acetate copolymer is added with an ethylene-vinyl acetate copolymer and a plasticizer and is filled with a high amount of wood flour, so that it is light and elastic. Methods for obtaining rich moldings are disclosed. However, vinyl chloride-vinyl acetate copolymers generally have a problem that heat stability is poor and extrusion and injection molding are difficult.

Japanese Patent Application Laid-Open (JP-A) No. 61-66732 discloses a profile-extruded product comprising a vinyl chloride resin mixed with an acrylonitrile-butadiene copolymer, a methyl methacrylate-acrylate copolymer and a plasticizer. There is disclosed a molded product obtained by molding a resin composition for use, which has a glossy fine grain and a small compression set. However, the above-mentioned composition has a problem that although wood grain is developed, since it does not contain wood flour, it has a glossy surface and has a poor woody feel.

Further, Japanese Patent Application Laid-Open No. Hei 7-195484 discloses a method for producing a molded article having a grain pattern in which wood powder is contained in a hard vinyl chloride resin.
Although this molded article has an excellent woody feel, it has a problem that it cannot be freely bent due to lack of flexibility.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and provides a molded article which is easy to mold, has excellent flexibility, and has a grain pattern or a woody texture on the surface. An object is to provide a vinyl chloride resin composition.

[0006]

According to the present invention, there is provided a composition (A).
A vinyl chloride resin composition containing 80 to 99% by weight and 20 to 1% by weight of a composition (B), wherein the composition (A) has an average degree of polymerization of 700 to 1200. 100 parts by weight, liquid plasticizer 25 to 60 parts by weight,
The composition (B) comprises 10 to 100 parts by weight of wood flour having a water content of 5% by weight or less and an average particle size of 30 to 500 μm, and 1 to 10 parts by weight of an acrylic processing aid. The degree is 100 to 50 more than that of the vinyl chloride resin (a).
100 parts by weight of a high vinyl chloride resin (b), 0 to 20 parts by weight of a liquid plasticizer less than that of the composition (A), wood powder having a water content of 5% by weight or less and an average particle size of 30 to 500 μm. Parts by weight, 1 to 10 parts by weight of an acrylic processing aid, and 0.5 to 6 parts by weight of a colored pigment.

The average degree of polymerization of the vinyl chloride resin (a) (hereinafter, referred to as PVC (a)) used in the composition (A) is limited to 700 to 1200. Average degree of polymerization of 7
If it is less than 00, the moldability is poor, and the compression set of the molded product becomes large. If the average degree of polymerization exceeds 1200, the surface condition of the molded product becomes poor.

The vinyl chloride resin (b) (hereinafter referred to as PVC (b)) used in the composition (B) includes the above-mentioned P
It is necessary to make the average polymerization degree higher than VC (a) by 100 to 500. If the average degree of polymerization is less than 100, the grain pattern becomes unclear, and if the average degree of polymerization exceeds 500, the surface is deteriorated because it is formed as a block (pellet).

The liquid plasticizers used in the compositions (A) and (B) include phthalic esters, adipic esters, trimellitic esters, polyester plasticizers,
General-purpose materials such as an epoxy plasticizer can be suitably used. The amount of the liquid plasticizer added to the composition (A) is PVC (a).
It is limited to 25 to 60 parts by weight, preferably 30 to 55 parts by weight, per 100 parts by weight. If the added amount is less than 25 parts by weight, the molded article has poor flexibility, and if it exceeds 60 parts by weight, the compression set of the molded article becomes large and the grain pattern is hardly developed.

The amount of the liquid plasticizer added to the composition (B) must be 0 to 20 parts by weight less than the amount added to the composition (A). If the addition amount is less than 20 parts by weight, the composition (B) is in an unmelted state, and a good grain pattern cannot be obtained, and the surface state is also deteriorated.

The water content of the wood flour used in the compositions (A) and (B) is limited to 5% by weight or less. If the water content exceeds 5% by weight, moisture remains in the composition, large bubbles appear in the molded product, and the surface condition deteriorates. The average particle size of the wood flour is limited to 30 to 500 μm, preferably 10 to
0 to 200 μm. If the average particle size is less than 30 μm, the wood powder is greatly burned during melting and becomes brownish and cannot be used for a light-colored molded product. If the average particle size exceeds 500 μm, the surface condition of the molded product deteriorates. is there.

In the compositions (A) and (B), the amount of wood flour added is limited to 10 to 100 parts by weight based on 100 parts by weight of PVC (a) or (b). If the added amount is less than 10 parts by weight, the woody feeling of the molded article is poor, and if it exceeds 100 parts by weight, the molded article is inferior in flexibility.

The type of wood used for the wood flour is not particularly limited, but, for example, conifers such as cedar, lauan, toga, and hinoki are suitable. Depending on the purpose of use, wood flour obtained from hardwood can also be used. Sawdust, rice husk, finely ground powder of particle board, or the like can also be used.
The method for turning the wood powder into fine powder is not particularly limited.
For example, there is a method of finely pulverizing chipped wood with a dry pulverizer.

The acrylic processing aid used in the compositions (A) and (B) is not particularly restricted but includes, for example, methyl methacrylate-styrene copolymer, alkyl acrylate-N- Vinyl lactam copolymer, alkyl methacrylate-N-vinyl lactam copolymer, methyl methacrylate-alkyl acrylate copolymer, methyl methacrylate-glycidyl methacrylate copolymer, Methyl methacrylate-isobornyl methacrylate copolymer, methyl methacrylate-acrylonitrile-alkyl acrylate terpolymer, PVC-methyl methacrylate-alkyl acrylate graft copolymer Polymers and the like are preferably used.

In the compositions (A) and (B), the amount of the acrylic processing aid added is PVC (a) or (b).
The amount is limited to 1 to 10 parts by weight, preferably 3 to 10 parts by weight, per 100 parts by weight. If the added amount is less than 1 part by weight, the moldability is poor because the amount is too small, and the compression set of the molded product becomes large. This is because if the amount exceeds 10 parts by weight, the molded product lacks flexibility.

The weight average molecular weight of the acrylic processing aid is preferably 2,000,000 to 5,000,000. If the weight-average molecular weight is less than 2,000,000, the viscosity at the time of melting is weak and molding is difficult, and the compression set of the molded product also becomes large. If the weight average molecular weight exceeds 5,000,000, the viscosity at the time of melting becomes too high, and the surface state of the molded product deteriorates.

The colored pigment used in the composition (B) may be any color pigment that is darker than the composition (A) in order to produce a wood grain pattern. On the other hand, it is limited to 0.5 to 6 parts by weight. If the amount is less than 0.5 part by weight, a good grain pattern cannot be obtained, and if the amount exceeds 6 parts by weight, the grain pattern is too strong and the wood texture is inferior.

The mixing ratio of the compositions (A) and (B) is 80 to 99% by weight of the composition (A) and 20 to 99% by weight of the composition (B).
Limited to 1% by weight. 1% by weight of composition (B)
If the amount is less than the above, a good grain pattern cannot be obtained, and if the amount exceeds 20% by weight, the surface state of the molded product deteriorates.

The compositions (A) and (B) may contain stabilizers and lubricants necessary for molding. As a stabilizer,
Lead-based stabilizers such as tribasic lead sulfate, dibutyltin maleate,
Examples include tin-based stabilizers such as dibutyltin mercapto, and calcium / zinc-based composite stabilizers. Examples of the lubricant include lead stearate, calcium stearate, fatty acid ester and the like.

The compositions (A) and (B) may further contain, if necessary, a filler such as calcium carbonate and silica, a foaming agent, an antioxidant and an ultraviolet absorber.

The compositions (A) and (B) are prepared by an extrusion method,
Although it can be molded by an injection molding method, a single extrusion molding method is more preferable. At that time, it is preferable that each of the compositions (A) and (B) is pelletized. As the conditions for pelletization, the compositions (A) and (B) are each heated at 80 to 120 ° C. by a mixer, and the compound is formed into a pellet at a temperature lower than the molding temperature using an extruder. . As the pellet conditions, the cylinder temperature of the extruder was set to 100 to 150 ° C., and the temperature of the pellet die was set to 130.
The temperature is preferably set to 160 ° C.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Examples 1 to 5) Compositions (A) and (B) having the amounts shown in Table 1 were mixed in a 20 L super-mixer for 10 minutes.
The resin compositions uniformly mixed at 0 ° C. were measured at cylinder temperatures of (C1: 110 ° C., C2: 120 ° C., C3: 12
5 ° C, C4: 135 ° C) and the adapter-temperature (A
(1: 130 ° C., A2: 140 ° C.) and a 30 mm twin-screw extruder set at a die temperature of 145 ° C., and an output of 15 to 2
The mixture was extruded at 0 kg / hour and cut with a pelletizer to obtain pellets.

Next, composition (A) and composition (B) shown in Table 1
Were mixed in the ratio shown in Table 2 at a weight ratio of 90/10, and the cylinder temperatures were respectively adjusted with a 30 mm single extruder (C1: 140 ° C, C2: 150 ° C,
C3: 170 ° C.), the die temperature is set to 175 ° C., and extruded at 5 to 6 kg / hour, 2 mm thick × 25 mm
A molded article having a width was obtained. As a result, as shown in Table 2, in each of the examples, a molded article having a good wood grain pattern and a feeling of woodiness and excellent in flexibility was obtained.

(Comparative Examples 1 to 3) Composition (A) shown in Table 1
And (B) were pelletized in the same manner as in the example, and the pellets of the composition (A) and the composition (B) were mixed at a weight ratio of 9
The mixture was mixed at a ratio of 0/10 in the combination shown in Table 2 to obtain a molded product under the same conditions as in the example. Table 2 shows the results. In any of the comparative examples, a molded product having a good grain pattern and a woody texture was not obtained.

The following raw materials were used as shown in Table 1. PVC: TS800E manufactured by Tokuyama Sekisui Industry Co., Ltd. (average degree of polymerization 800): TS1000R manufactured by Tokuyama Sekisui Industry Co., Ltd. (average degree of polymerization 1000): TS1400K manufactured by Tokuyama Sekisui Industry Co., Ltd. (average degree of polymerization: 1400) Plasticizer: DOP (dioctyl phthalate) Wood flour: manufactured by Casino Co. (average particle size: 150 μm) Processing aid: P-530 manufactured by Mitsubishi Rayon Co., Ltd. (weight average molecular weight: 3,000,000) P-501 manufactured by Mitsubishi Rayon Co., Ltd. (weight average molecular weight: 1,000,000) Stable Agent: TL-7000 manufactured by Sakai Chemical Industry Co., Ltd. SL-1000 manufactured by Sakai Chemical Industry Co., Ltd. SC-100 manufactured by Sakai Chemical Industry Co., Ltd. Pigment: Brown manufactured by Dainippon Ink and Chemicals, Inc.

The following performance evaluation was carried out using the molded articles or test pieces obtained in the above Examples and Comparative Examples, and the results are shown in Table 2. (1) Compression set test 37 mm diameter x 6.5 m according to JIS-K6301
A test piece having a thickness of m was compressed by inserting a spacer having a thickness of 5 mm, and the compression set at 70 ° C. for 22 hours was measured. The compression set is preferably 60% or less.

(2) Wood grain pattern The surface condition of the obtained molded article was visually observed, and the wood grain pattern was judged according to the following criteria. ：: Appears clearly.
Δ: Appears blurred. X: A single color is obtained by mixing. (3) Wood texture The surface condition of the obtained molded article was visually observed, and the wood texture was determined according to the following criteria. ：: There is a feeling of wood. ×: No woody feeling. (4) Moldability The surface state of the obtained molded body was visually observed, and judged according to the following criteria. ：: The surface is smooth and good. Δ: The surface is slightly rough. ×: The surface is rough.

[0029]

[Table 1]

[0030]

[Table 2]

[0031]

The compositions (A) and (B) of the present invention are constituted as described above, and the composition (B) is the composition (A)
Since the average polymerization degree of PVC is higher, the amount of plasticizer is smaller, and the blending ratio is darker and smaller than that of the composition (A), the composition (B) has a good grain pattern in the matrix of the composition (A). To form In addition, when a suitable amount of wood flour is blended with the compositions (A) and (B), the molded product is excellent in woody feeling, and is semi-hard and excellent in flexibility by adding a plasticizer. Further, by adding an acrylic processing aid, a molded article having excellent moldability, small compression set and good surface condition can be obtained.

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI (C08L 27/06 33:06)

Claims (2)

[Claims] 1. A vinyl chloride resin composition comprising 80 to 99% by weight of composition (A) and 20 to 1% by weight of composition (B), wherein said composition (A) has an average degree of polymerization of 700. ~
100 parts by weight of 1200 vinyl chloride resin (a), 25 to 60 parts by weight of a liquid plasticizer, 10 to 100 parts by weight of wood flour having a water content of 5% by weight or less and an average particle size of 30 to 500 μm,
And 1 to 10 parts by weight of an acrylic processing aid, wherein the composition (B) has an average degree of polymerization of 100 to 500 higher than that of the vinyl chloride resin (a).
100 parts by weight, 0 to 20 parts by weight of a liquid plasticizer less than the composition (A), a water content of 5% by weight or less and an average particle size of 30 to
A vinyl chloride resin composition comprising 10 to 100 parts by weight of wood flour having a size of 500 μm, 1 to 10 parts by weight of an acrylic processing aid, and 0.5 to 6 parts by weight of a colored pigment. 2. The vinyl chloride resin composition according to claim 1, wherein the weight average molecular weight of the acrylic processing aid is 2,000,000 to 5,000,000.