JP2001131374A - Chlorinated vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chlorinated vinyl chloride-based resin composition which does not reduce impact strength, improves metal peelability, and has improved thermal stability during molding. A chlorinated vinyl chloride resin containing 0.1 to 3 parts by weight of a chlorinated polypropylene resin with respect to 100 parts by weight of a chlorinated vinyl chloride resin, and further containing a heat stabilizer, an impact absorber and a lubricant. Into a composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chlorinated vinyl chloride resin composition which does not reduce impact strength, has improved metal releasability, and has improved thermal stability during molding.

[0002]

2. Description of the Related Art A molded article of a chlorinated vinyl chloride resin has a characteristic that its heat deformation temperature is high. It is used for applications at relatively high temperatures where it cannot be used. For example, a chlorinated vinyl chloride resin molded article is used as a pipe for hot water, utilizing the fact that the heat distortion temperature is higher by 20 to 40 ° C. than that of a vinyl chloride resin molded article. In addition, when molding pipes,
The chlorinated vinyl chloride-based resin can be molded by a general-purpose vinyl chloride-based resin extrusion molding machine, which also makes the chlorinated vinyl chloride-based resin widely usable.

On the other hand, when molding a chlorinated vinyl chloride resin, the chlorinated vinyl chloride resin has a higher melt viscosity than the vinyl chloride resin, has poor thermal stability at a molding temperature, and suffers from burning during molding. It has the drawback of being easily extruded and having low extrusion productivity. For example, when extruding a chlorinated vinyl chloride resin into a hot water pipe, sticking occurs in the die and plate-outs occur, coloring occurs, and in some cases, burning occurs during extrusion molding, There may be problems such as being unusable as a product.

[0004]

SUMMARY OF THE INVENTION The present invention is to provide a chlorinated vinyl chloride resin composition which does not decrease impact strength, improves metal releasability, and has improved thermal stability during molding. Chlorinated vinyl chloride resin 10
A chlorinated vinyl chloride resin composition containing 0.1 to 3 parts of a chlorinated polypropylene resin with respect to 0 parts by weight (hereinafter referred to as "parts"), and further containing a heat stabilizer, an impact absorber and a lubricant. Item 1), wherein the chlorinated polypropylene resin has a chlorine content of 1 to 50% by weight (hereinafter, referred to as%);
And a viscosity of 0.05% when made into a 10% toluene solution.
The composition according to claim 1, which has 10 poises (claim 2).
And the chlorinated polypropylene resin has a chlorine content of 2
The composition according to claim 1 or 2 (claim 3), which is 0 to 40%.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The chlorinated vinyl chloride resin used in the present invention is generally used for pipe extrusion molding. The average degree of polymerization of the vinyl chloride resin before chlorination is 600 to 1500, Further, it is preferably from 600 to 1300, particularly preferably from 600 to 1200. When the average degree of polymerization of the vinyl chloride resin as a raw material of the chlorinated vinyl chloride resin is less than 600, it is difficult to obtain sufficient mechanical strength. On the other hand, when the degree of polymerization exceeds 1500, Processing tends to be difficult.

The vinyl chloride resin is a (co) polymer composed of 70 to 100% of vinyl chloride units and 0 to 30% of monomer units copolymerizable with vinyl chloride. As, for example, a homopolymer of vinyl chloride,
Copolymers of vinyl chloride with a monomer copolymerizable therewith (for example, at least one kind of ethylene, propylene, vinyl acetate, allyl chloride, allyl glycidyl ether, acrylate, vinyl ether, etc.) are mentioned. However, the present invention is not limited to this.

The degree of chlorination of the chlorinated vinyl chloride resin is preferably 62 to 70%, more preferably 64 to 70%. When the degree of chlorination of the chlorinated vinyl chloride resin is less than 62%, it is difficult to obtain a composition having a sufficient heat distortion temperature. On the other hand, when the degree of chlorination exceeds 70%, the melt viscosity increases, There is a tendency for the composition to be difficult to process.

The chlorinated polypropylene resin used in the present invention has a chlorine content of 1 to 50%, more preferably 20 to 40%.
And 10% toluene solution has a viscosity of 0.0
Those having 5 to 10 poise (25 ° C.) are preferred. When the chlorine content of the chlorinated polypropylene resin is more than 50%,
The compatibility with the chlorinated vinyl chloride resin becomes so high that the metal releasability at the time of molding is not sufficiently improved, and the thermal stability at the time of molding tends to be not sufficiently improved. On the other hand, when the chlorine content is less than 1%, the metal releasability is improved and the thermal stability at the time of molding is improved, but the impact strength may be reduced. Further, the chlorinated polypropylene resin,
The viscosity at 25 ° C. of a 10% toluene solution becomes 10%.
When the poise is higher than the poise, the dispersion in the chlorinated vinyl chloride resin becomes uneven, the shrinkage during molding is large, and the appearance of the molded article may be impaired. Conversely, if less than 0.05 poise,
Since the molecular weight is low, there is a tendency that the metal peeling effect is not exhibited or the thermal stability is lowered.

The chlorinated polypropylene resin is used in an amount of 0.1 to 100 parts per 100 parts of the chlorinated vinyl chloride resin.
It is three parts. If the amount used is less than 0.1 part, the expected effect cannot be obtained. On the other hand, if the amount is more than 3 parts, phase separation occurs, and the quality of the product is deteriorated or the appearance is impaired.

The heat stabilizer used in the present invention is used for improving the heat stability of the composition, improving the ease of burning during molding and reducing the decrease in extrusion productivity.

Specific examples of the heat stabilizer include, for example, Ba-Zn stabilizer, Ca-Zn stabilizer, Sn stabilizer, Pb stabilizer, Mg-Al stabilizer, hydrotalcite stabilizer. And heat stabilizers that are commonly used, such as agents. These may be used alone or in combination of two or more.

The heat stabilizer is used in an amount of 0.1 to 7 parts, more preferably 0.1 to 7 parts, per 100 parts of the chlorinated vinyl chloride resin.
It is preferably 5 to 5 parts.

The shock absorber used in the present invention includes:
Those usually used as impact absorbers for chlorinated vinyl chloride resins, for example, methyl methacrylate-butadiene-styrene polymer (MBS), acrylonitrile-butadiene-styrene polymer (ABS), butadiene or styrene- Any polymer such as a polymer obtained by grafting butadiene rubber with methyl methacrylate-styrene-acrylonitrile (MABS), chlorinated polyethylene (CPE), or an impact rubber containing acrylic rubber as a main component can be used. These may be used alone or in combination of two or more. Of these, M
A combination of BS and CPE is preferred.

The amount of the shock absorber used is preferably 4 to 15 parts, more preferably 6 to 9 parts per 100 parts of the chlorinated vinyl chloride resin, from the viewpoint of providing a balance between impact resistance and heat distortion temperature. preferable. In order to further improve the effect of adding the chlorinated polypropylene resin, it is preferable to use 0.1 to 3 parts of chlorinated polyethylene in combination.

The lubricant used in the present invention includes polyethylene wax, polyethylene oxide, high molecular weight paraffin wax and the like. These may be used alone or in combination of two or more. Among them, polyethylene wax is preferred.

The amount of the lubricant is preferably 1.5 to 4 parts based on 100 parts of the chlorinated vinyl chloride resin. If the blending amount of the lubricant is less than 1.5 parts, the melt viscosity becomes high, and the extrusion processability tends to decrease. If it exceeds 4 parts, the lubricity between the resin and the metal becomes too strong, and the extrusion process is performed. Pulsation is likely to occur in the resin discharge at the time.

In the present invention, it is used as an essential component comprising a chlorinated vinyl chloride resin, a chlorinated polypropylene resin, a heat stabilizer, a shock absorber and a lubricant, and further as a vinyl chloride resin such as a modifier and a processing aid. May be added. Further, a filler such as titanium dioxide or calcium carbonate may be added. Further, a coloring agent that is generally used for molding a chlorinated vinyl chloride resin may be added.

The chlorinated vinyl chloride resin composition of the present invention can be produced by blending the above essential components and desired additives using a conventional mixing / kneading apparatus. The chlorinated vinyl chloride resin composition of the present invention can be used in the field where a conventional chlorinated vinyl chloride resin (composition) is used. Particularly preferably used.

[0019]

The composition of the present invention will be described below in more detail with reference to examples, but the present invention is not limited to these examples.

The raw materials and evaluation methods used in the examples and comparative examples are described below.

[Raw materials] Chlorinated vinyl chloride resin: H829 (Kanebuchi Chemical Industry Co., Ltd.)
Chlorinated polypropylene resin 1: 16-LP (manufactured by Toyo Kasei Kogyo Co., Ltd., chlorinated polypropylene, chlorine content 32)
%, 10% toluene solution viscosity about 0.4P (25 ° C)) Thermal stabilizer: dioctyltin mercapto (Nitto Kasei Co., Ltd.)
Shock absorber 1: B56 (manufactured by Kanegafuchi Chemical Industry Co., Ltd., MB)
S) Shock absorber 2: H135 (chlorinated polyethylene manufactured by Daiso Corporation) Lubricant 1: AC629A (polyethylene wax manufactured by Allied Signal) Lubricant 2: AC617A (polyethylene wax manufactured by Allied Signal) Filler: R650 (made by Sakai Chemical Industry Co., Ltd., titanium oxide)

[Evaluation Method] (Plate-out occurrence time and surface properties) Using a lab conical extrusion tester manufactured by Toyo Seiki Co., Ltd., a barrel temperature of 190 ° C., a die temperature of 205 ° C., and a screw rotation number of 30 were used. Under the conditions, a round bar was extruded. The appearance of the extruded round bars was evaluated for appearance (visual observation), and the time of occurrence of blackened plate-outs generated at the tip of the die was measured.

In addition, the appearance evaluation (visual) was evaluated on a sample before a plate-out object was generated with a round bar.
：: good, Δ: acceptable, ×: unacceptable.

(Izod impact value) After kneading the resin composition with an 8-inch roll, press processing is performed, and JIS
An Izod impact test of K7110 was performed. The sample preparation conditions were as follows: roll kneading at 200 ° C. for 5 minutes and press working at 205 ° C. for 10 minutes.

The evaluation was performed with a sample thickness of 5 mm, a V notch,
The test was performed using a 3.92 J (40 kg · cm) hammer.

Examples 1 to 3 and Comparative Example 1 The components shown in Table 1 were mixed in the amounts shown in Table 1, and uniformly mixed with a homogenizer to produce a resin composition. A test sample was prepared using the obtained resin composition and evaluated. Table 1 shows the results.

[0027]

[Table 1]

From Table 1, it can be seen that even when the chlorinated polypropylene resin was added, no drop in impact strength was observed, and in the evaluation of round bar extrusion by Labo Conical, the time required to generate plate-outs was improved, and the surface of the round bar surface was improved. It turns out that the property becomes good.

[0029]

EFFECT OF THE INVENTION By using the chlorinated vinyl chloride resin composition of the present invention, impact strength is not reduced, metal releasability is improved, thermal stability during molding is improved, and extrusion molding is improved. The occurrence of plate-outs can be suppressed, and the continuous productivity in molding processes such as pipe extrusion is dramatically improved.

Claims (3)

[Claims] 1. A chlorinated vinyl chloride containing 0.1 to 3 parts by weight of a chlorinated polypropylene resin with respect to 100 parts by weight of a chlorinated vinyl chloride resin, and further containing a heat stabilizer, an impact absorber and a lubricant. -Based resin composition. 2. The composition according to claim 1, wherein the chlorinated polypropylene resin has a chlorine content of 1 to 50% by weight and a viscosity in a 10% by weight toluene solution of 0.05 to 10 poise. 3. The composition according to claim 1, wherein the chlorinated polypropylene resin has a chlorine content of 20 to 40% by weight.