JPH10298379A - Chlorinated vinyl chloride resin-based molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject molded product hardly causing the deformation or warpage even when the wall thickness is small by using a composition containing a specific chlorinated vinyl chloride resin, an acrylic processing aid having a specific average molecular weight and a wood flour having a specified average particle diameter. SOLUTION: This molded product is obtained by molding a composition containing (A) 100 pts.wt. chlorinated vinyl chloride resin, prepared by post- chlorinating a vinyl chloride resin having 500-1,200 average polymerization degree (a homopolymer or a copolymer with other monomers) and having 63-67 wt.% chlorine content, (B) 3-20 pts.wt. acrylic processing aid having 2,000,000-5000,000 average molecular weight [e.g. commercially available Kaneace PA-30 (R) (manufactured by Kaneka Corporation) or a copolymer of methyl methacrylate as a principal component and an acrylic ester monomer] and (C) 10-100 pts.wt. wood flour having 30-300 μm average particle diameter (e.g. preferably the wood flour of a coniferous tree such as a Japanese cedar, a lauan or a Japanese cypress), as necessary, adding a stabilizer, a lubricant, a reinforcing agent, a filler, a pigment, etc., thereto and molding the resultant mixture according to an extrusion molding method, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a chlorinated vinyl chloride resin-based molded article.

[0002]

2. Description of the Related Art Conventionally, as a decorative article for a house, for example, in a door inlet, a closet, a skirting board, or a peripheral edge, and as a home appliance, for example, a material such as a louver of an air conditioner is metal. (Steel, stainless steel, aluminum, etc.) and wood are used. In recent years, attempts have been made to make the resin by extrusion molding from the viewpoint of decorativeness and texture. In general, when used for the above applications, the thickness of the molded body is designed to be thin, and is often about 1 mm thick. However, since the molded article is exposed to a relatively high temperature depending on the place where the molded article is used, there is a problem in that when a resin having poor heat resistance is used, deformation or bending occurs.

[0003] As a method of solving the deformation and deflection of the molded article, for example, it is conceivable to add a reinforcing material such as glass fiber to a resin or to reinforce the molded article with a metal or the like.
When the thickness of the molded body is small, there is a problem that it cannot be easily performed. There is also a problem that the appearance of the molded article is impaired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a chlorinated vinyl chloride resin-based molded article having a small thickness and a small deformation and deflection. And

[0005]

According to the present invention, an average degree of polymerization of 5 is provided.
100 to 1000 parts by weight of a chlorinated vinyl chloride resin having a chlorine content of 63 to 67% by weight obtained by post-chlorination of a vinyl chloride resin having a molecular weight of 200 to 1200, and 3 to 20 parts by weight of an acrylic processing aid having an average molecular weight of 2 to 5 million. Parts, and average particle size of 30 to 3
It is characterized in that it is formed from a composition comprising 10 to 100 parts by weight of 00 μm wood flour.

The chlorinated vinyl chloride resin (hereinafter referred to as CPV)
C), the average degree of polymerization of the vinyl chloride resin (hereinafter referred to as PVC) before post-chlorination is 500 to 120.
Limited to zero. If the average degree of polymerization is less than 500, the strength of the molded article is insufficient.

[0007] The PVC is not limited to a homopolymer, but may be a copolymer with another monomer. Examples of other monomers include olefins such as ethylene and propylene; vinyl monomers such as vinyl acetate; and acrylic monomers such as 2-ethylhexyl methacrylate and butyl methacrylate. Used. As the above copolymer,
It is preferable that the content of vinyl chloride is 80% by weight or more. The method for producing the PVC is not particularly limited, and a known method such as suspension polymerization, emulsion polymerization, or bulk polymerization is used.

The above-mentioned CPVC is obtained by post-chlorination of PVC, but the method of post-chlorination is not particularly limited.
There are known methods, for example, a method performed in a gas phase, a method performed in an aqueous phase, a method performed in an organic solvent, and the like.

The average chlorine content of the above CPVC is 63-6.
Limited to 7% by weight. If the average chlorine content is less than 63% by weight, heat resistance is reduced, deformation and deflection are increased, and
If the content is more than 10% by weight, the fluidity is reduced, and it becomes difficult to form a thin material.

The CPVC may be used in combination with PVC, if necessary. In this case, the added amount of PVC is preferably 0 to 60% by weight based on CPVC. The average polymerization degree of the PVC is preferably 500 to 1400.

The amount of the wood flour to be added is limited to 10 to 100 parts by weight based on 100 parts by weight of CPVC. 10 wood flour
If the amount is less than 100 parts by weight, the deflection of the molded body becomes large,
If the amount is more than 10 parts by weight, molding becomes difficult and a thin molded article cannot be obtained.

The average particle size of the wood flour is 30 to 300.
μm. If the average particle size is less than 30 μm, CPV
This is because mixing with C is difficult, and when the average particle size exceeds 300 μm, the surface state of the obtained molded article deteriorates.

The types of wood used for the wood flour include:
Although not particularly limited, for example, conifers such as cedar, lauan, toga, and cypress 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 finely pulverizing wood flour is not particularly limited. For example, there is a method of finely pulverizing chipped wood with a dry pulverizer and classifying it with a cyclone and a bag filter, and other methods. But it is good. .

The acrylic processing aid is not particularly restricted but includes, for example, commercially available Kaneace PA-30, P
A-40 (manufactured by Kanegafuchi Chemical Co., Ltd.), Polaroid K-125 (manufactured by Rohm and Haas Co., Ltd.), Metablen P-551, P-
530 and P-531 (manufactured by Mitsubishi Rayon Co., Ltd.). Alternatively, a copolymer with an acrylate monomer mainly composed of a methyl methacrylate monomer may be used. Examples of the acrylate monomer include methyl acrylate, ethyl acrylate, and butyl acrylate.

The weight average molecular weight of the acrylic processing aid is limited to 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. If the weight average molecular weight exceeds 5,000,000, the viscosity at the time of melting becomes too high and molding becomes difficult.

The amount of the acrylic processing aid added is CP
It is limited to 3 to 20 parts by weight for 100 parts by weight of VC. If the amount added is less than 3 parts by weight, the elongation of the molten resin is insufficient and molding becomes difficult, and if the amount exceeds 20 parts by weight, the viscosity at the time of melting becomes too high and molding becomes difficult.

The above-mentioned CPVC may be added with various additives generally used in molding. For example, stabilizers, lubricants, reinforcing agents, fillers, pigments and the like may be added.

Examples of the stabilizer include lead stabilizers such as tribasic lead sulfate, basic lead sulfite and dibasic lead phosphite; dibutyl or dioctyltin maleate, dibutyl or dioctyltin mercapto, dibutyl Tin-based stabilizers such as tin-laurate; calcium / zinc-based composite stabilizers; and epoxy-based stabilizers.

Examples of the lubricant include organic acids such as stearic acid and oleic acid; metal salts thereof such as calcium, lead, zinc and barium; higher alcohols such as stearyl alcohol; And fatty acid esters of the above-mentioned organic acids; and waxes such as polyethylene wax.

Examples of the reinforcing agent include methyl methacrylate-butadiene-styrene copolymer (MBS),
Methyl methacrylate / acrylate copolymer, ethylene / vinyl acetate copolymer (EVA), acrylonitrile / butadiene / styrene copolymer (ABS), and the like. The amount of the reinforcing agent used is preferably 15 parts by weight or less based on 100 parts by weight of CPVC.

Examples of the filler include calcium carbonate, clay, talc, mica, and the like. The amount of the filler is preferably 20 parts by weight or less based on 100 parts by weight of CPVC. As the pigment, for example,
Titanium oxide, carbon black and the like can be mentioned, but pigments for PVC which are usually used may be used.

Next, a second aspect of the present invention will be described. The molded article of the present invention 2 has a minimum thickness of 0.1 mm.
It is a molded body of 5 to 2 mm. If the minimum thickness is less than 0.5 mm, it is difficult to reduce the deflection of the molded body,
If it exceeds mm, it cannot be used for limited applications.

Examples of the shape of the above-mentioned molded article (thin molded article) include a plate shape, a hollow shape, and an irregular shape. The above minimum thickness refers to the thickness of the thinnest part of the molded articles having different thicknesses.

The composition of the present invention can be prepared in a mixture of 80 to 12 with a mixer or the like.
The mixture may be heated and mixed at 0 ° C. to form a powdery compound, or the compound may be formed into pellets at a temperature lower than the molding temperature by using an extruder. As the pellet conditions, it is preferable that the cylinder temperature of the extruder is 100 to 150 ° C and the temperature of the pellet die is 130 to 160 ° C. As the molding method, any of an extrusion molding method, an injection molding method, a calendar molding method, a blow molding method and the like can be molded, but the extrusion molding method is preferred.

[0025]

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.

(Preparation of Raw Material Pellets) Compositions having the compounding amounts shown in Tables 1 and 2 were heated at 100 ° C. in a 20 L super mixer.
And then cooled to 60 ° C. or lower to form a powder. The powders were heated at cylinder temperatures (C1: 100 ° C., C2: 110 ° C., C3: 120
° C, C4: 135 ° C) and the die temperature (D1: 14
(5 ° C., D2: 150 ° C.), the mixture was fed to a 30 mm twin-screw extruder with a screw rotation speed of 35 rpm and an extrusion rate of 25 kg / hour, and cut by a hot cut pelletizer to obtain pellets.

Next, the above pellets were subjected to cylinder-temperature (C1: 150 ° C.,
(C2: 160 ° C., C3: 175 ° C.), the die temperature was set to 185 ° C., and the plate was extruded with a screw rotation speed of 45 rpm and a breaker of −2 mmφ to obtain a plate-like molded product having a thickness of 1 mm and a width of 30 mm.

(Examples 1 to 10 and Comparative Examples 1 to 9) The plate-shaped molded articles of Examples 1 to 10 shown in Table 1 and Comparative Examples 1 to 9 shown in Table 2 were evaluated by the following evaluation methods. The results are shown in Tables 1 and 2.

The following raw materials shown in Tables 1 and 2 were used. CPVC: manufactured by Tokuyama Sekisui Kogyo Co., Ltd. PVC: manufactured by Tokuyama Sekisui Kogyo Co., Ltd. Wood flour: manufactured by Rettenmeier Co., Ltd. Acrylic processing aid: manufactured by Mitsubishi Rayon Co., Ltd. Metabrene P-530 (weight average molecular weight 3,000,000) Stabilizer: Sakai 2.0 parts by weight, TL-7000 manufactured by Chemical Industry Co., Ltd. 1.0 parts by weight, SL-1000 manufactured by Sakai Chemical Industry Co., Ltd. 1.5 parts by weight, SC-100 manufactured by Sakai Chemical Industry Co., Ltd. Calcium carbonate: Polyethylene wax manufactured by Shiraishi Calcium Co., Ltd .: Mitsui Oil Pigment manufactured by Chemical Company: manufactured by Dainippon Ink and Chemicals, Inc.

(Evaluation method) (1) Appearance: The surface condition of the obtained molded article was visually observed to judge the quality. (2) Formability: Whether or not molding is possible under the above molding conditions is visually observed to determine whether the molding is good or not (good) − △ (somewhat difficult) − ×
(Impossible). (3) Flexibility; 30 mm width, 1.0 mm thickness, 500
mm (length between supports) is placed in a dryer at 60 ° C.
The height at the center between the fulcrums was measured with a reading microscope, and after 5 hours, the same measurement was performed.
mm).

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

Industrial Applicability The present invention can be obtained by blending a proper amount of wood flour and an acrylic processing aid into CPVC to form a composition having a good surface condition and excellent heat resistance and moldability. A thin molded article having a good appearance and a small deflection can be obtained.

Claims (3)

[Claims] 1. An acrylic resin having an average molecular weight of 2,000,000 to 5,000,000 and 100 parts by weight of a chlorinated vinyl chloride resin having a chlorine content of 63 to 67% by weight obtained by post-chlorination of a vinyl chloride resin having an average degree of polymerization of 500 to 1200. 3 to 20 parts by weight of a system processing aid and 10 to 1 part of wood powder having an average particle size of 30 to 300 μm.
A chlorinated vinyl chloride resin-based molded article formed from a composition comprising 00 parts by weight. 2. The chlorinated vinyl chloride resin-based molded article according to claim 1, wherein the minimum thickness of the molded article is 0.5 to 2 mm. 3. The chlorinated vinyl chloride resin-based molded article according to claim 1, wherein the molded article is used for purposes other than a blind light shielding plate (slat).