JPH11181206A - Chlorinated vinyl chloride-based resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a chlorinated vinyl chloride-based resin composition excellent in heat stability and at the same time, capable of increasing the extrusion volume in extrusion molding, resulting in its high productivity, therefore, suitable for extrusion pipe molding. SOLUTION: This composition is obtained by including 100 pts.wt. of a resin component comprising 80-99 pts.wt. of a chlorinated vinyl chloride-based resin having a polymerization degree of 600-1500 before chlorination and a chlorination degree of 62-70 wt.%, and 1-20 pts.wt. of a vinyl chloride-based paste resin produced by emulsion polymerization or minute suspension polymerization and having a particle size of 5-100 μm after spray drying and having a polymerization degree of 600-2,100, and 3-15 pts.wt. of an impact modifier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A molded article of chlorinated vinyl chloride resin has a feature of high heat resistance, and is used at a relatively high temperature at which a conventional molded article of vinyl chloride resin cannot be used due to heat deformation. Used for applications. 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 molding, the chlorinated vinyl chloride-based resin can be molded by a general-purpose vinyl chloride-based resin extrusion molding machine, which is a factor that makes the chlorinated vinyl chloride-based resin widely usable.

[0003] On the other hand, when molding a chlorinated vinyl chloride resin, the chlorinated vinyl chloride resin is inferior in thermal stability to the vinyl chloride resin and has a drawback that it is easily burned during molding. For example, when extruding a chlorinated vinyl chloride resin into a hot water pipe, coloring may occur, and in some cases, burning may occur during the extrusion molding, which may cause problems such as being unusable as a product. Furthermore, when chlorinated vinyl chloride resin is extruded into a hot water pipe,
The die pressure and extrusion torque of the extruder rise and burn. In order to prevent this, in a typical extruder for vinyl chloride resin, the feed rate of the chlorinated vinyl chloride resin is reduced compared to the vinyl chloride resin, the discharge rate is reduced, and the die pressure and extrusion torque are reduced. Need to be suppressed. That is, when extruding a chlorinated vinyl chloride resin for a pipe, there is a problem that the discharge amount is small and productivity is poor.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a chlorinated vinyl chloride resin which is excellent in thermal stability, can increase the discharge rate at the time of extrusion molding and can increase productivity, and is preferable for extrusion pipe molding. It is to provide a composition.

[0005]

According to the present invention, an object of the present invention is to provide a polymerizable composition having a polymerization degree before chlorination of 600 to 1500,
80 to 99 parts by weight of a chlorinated vinyl chloride resin having a chlorination degree of 62 to 70% by weight, a particle diameter after spray drying produced by emulsion polymerization or fine suspension polymerization of 5 to 100 μm, 100 parts by weight of a resin component containing 1 to 20 parts by weight of a vinyl chloride paste resin having a
And a chlorinated vinyl chloride-based resin composition containing 3 to 15 parts by weight of a shock absorber and, if desired, a stabilizer and a lubricant.

In the resin composition of the present invention, the amount of the vinyl chloride paste resin must be 20 parts by weight or less based on 80 parts by weight or more of the chlorinated vinyl chloride resin. When the ratio of the vinyl chloride-based paste resin to the chlorinated vinyl chloride-based resin is more than this, the heat resistance of the molded article from the obtained chlorinated vinyl chloride-based resin composition, for example, the pipe is reduced, and the initial heat resistance is high. The advantage of the present invention is lost.

In the present invention, the chlorinated vinyl chloride pipe resin has a polymerization degree before chlorination of 600 to 150.
0, a chlorinated vinyl chloride resin having a chlorination degree of 62 to 70% by weight is used. “Vinyl chloride resin” includes not only vinyl chloride homopolymer but also vinyl chloride and other monomers of 20% by weight or less (eg, ethylene, propylene, vinyl acetate, allyl chloride, allyl glycidyl ether, acrylate, vinyl ester) Etc.) copolymers with at least one.

If the degree of polymerization of the vinyl chloride resin as a raw material of the chlorinated vinyl chloride resin is less than 600, sufficient mechanical strength cannot be obtained, while if the degree of polymerization exceeds 1,500, the resin composition It is not preferable because the processing is not easy. If the chlorination degree of the chlorinated vinyl chloride resin is less than 62% by weight, a molded article having sufficient heat resistance cannot be obtained,
On the other hand, if the chlorination degree exceeds 70% by weight, the melt viscosity increases, and the processing of the resin composition involves technical difficulties.

In the resin composition of the present invention, a vinyl chloride paste resin having a particle size after spray drying of 5 to 100 μm and a polymerization degree of 600 to 2100, produced by emulsion polymerization or fine suspension polymerization, is used. A system paste resin is used. In order to achieve the object of the present invention, the vinyl chloride paste resin needs to be produced by emulsion polymerization using an emulsifier or fine suspension polymerization. Although the reason is unknown, it is considered that the emulsifier remaining on the surface of the vinyl chloride-based paste resin contributes to achieving the effects of the present invention.

The particle size of the vinyl chloride paste resin produced by emulsion polymerization or fine suspension polymerization after spray drying is usually 5 to 100 μm, preferably 10 to 50 μm, and the degree of polymerization is 600 to 2100, preferably 800. １1600. If the particle size of the vinyl chloride-based paste resin after spray drying is smaller than 5 μm, fine paste resin tends to be swelled when the composition is blended, which is not good for the working environment. On the other hand, if the particle diameter exceeds 100 μm, the effect of the present invention, that is, the effect of increasing the discharge amount at the time of extrusion molding, cannot be seen so much. If the degree of polymerization is less than 600, sufficient mechanical strength cannot be obtained, while if the degree of polymerization exceeds 2100, processing of the resin composition is not easy, which is not preferable.

In the present invention, the chlorinated vinyl chloride resin is
The shock absorber is mixed in an amount of 3 to 15 parts by weight with respect to 0 parts by weight or more and 20 parts by weight or less of the vinyl chloride paste resin.
Examples of the shock absorber include methyl methacrylate-butadiene-styrene copolymer (MBS), ABS, MABS,
CPE, shock absorbers based on acrylic rubber, etc.
What is usually used as a shock absorber of a chlorinated vinyl chloride resin can be used. In particular, MB is used as a shock absorber to provide a balance between impact resistance and heat resistance.
It is preferable to use a mixture of S and chlorinated polyethylene or only MBS. In that case, the total content of the shock absorber is 80 parts by weight or more of chlorinated vinyl chloride resin and 20 parts by weight of vinyl chloride paste resin. The following resin component 1
Desirably, the amount is 3 to 15 parts by weight with respect to 00 parts by weight.

If the amount of the shock absorbing agent to be blended is less than 3 parts by weight, the impact resistance of a molded product, especially a pipe, is lowered, and
If the amount exceeds 5 parts by weight, the heat resistance, which is a characteristic of the chlorinated vinyl chloride resin, is reduced. From the balance of impact resistance and heat resistance of a molded product, for example, a pipe, MBS 4 to 12 parts by weight and a chlorine content of 10 to 50 are used as a shock absorber.
A mixture with 1 to 5 parts by weight of chlorinated polyethylene by weight
Alternatively, it is preferable to use only MBS. When the impact modifier is a mixture of MBS and chlorinated polyethylene, the chlorine content in the chlorinated polyethylene is 40 to 40%.
It is more preferable that the content be 50% by weight in view of the development of impact resistance.

In the present invention, the chlorinated vinyl chloride resin is
In addition to the above vinyl chloride paste resin and shock absorber,
If necessary, a stabilizer and a lubricant are blended. The stabilizer and the lubricant may be those usually used in molding of chlorinated vinyl chloride resin, and a tin stabilizer is particularly preferable. Such stabilizers include alkyl tin compounds (eg, methyl tin, butyl tin, octyl tin, mixed metal alkyl tins). In addition, methyltin mercapto, octyltin mercapto, butyltin mercapto, dialkyltin bis (alkylmercaptocarboxylate), octyltin maleate, butyltin maleate, octyltin laurate, butyltin laurate, butyltin laurate maleate, octyltin Esters such as carboxylate and butyltin carboxylate are used.

The compounding amount of the stabilizer is 1.5 to 5 parts by weight based on 100 parts by weight of the resin component containing 80 parts by weight or more of the chlorinated vinyl chloride resin and 20 parts by weight or less of the vinyl chloride paste resin. Is preferred. If the amount of the stabilizer is less than 1.5 parts by weight, the thermal stability of the chlorinated vinyl chloride resin is undesirably reduced. When the amount of the stabilizer exceeds 5 parts by weight,
The effect of thermal stability reaches a plateau, and thermal stability corresponding to the added amount cannot be obtained.

[0015] Lubricants include di- and trioleate polyglycerol, polyethylene, polyethylene oxide, high molecular weight paraffin wax. A preferred lubricant is polyethylene wax. The amount of the lubricant is preferably 1.5 to 4 parts by weight based on 100 parts by weight of the resin component containing the chlorinated vinyl chloride resin and the vinyl chloride paste resin. If the amount of the lubricant is less than 1.5 parts by weight, the melt viscosity will be high, and the extrudability will be poor.
On the other hand, if the amount of the lubricant exceeds 4 parts by weight, the lubricity between the resin and the metal becomes too strong, and pulsation may occur in the resin discharge during extrusion, which is not preferable.

In the chlorinated vinyl chloride resin composition of the present invention, in addition to the above-mentioned additives, other additives usually added to the chlorinated vinyl chloride resin, for example, fillers such as titanium dioxide and calcium carbonate. May be blended. In addition, as the coloring agent, a coloring agent that is usually used in molding of a chlorinated vinyl chloride resin may be used.

[0017]

The present invention will be described below with reference to examples and comparative examples. Needless to say, the present invention is not limited to only the following examples. In the Examples and Comparative Examples, “parts” or “%” means “parts by weight” unless otherwise specified.
Or "wt%".

Example 1 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin (CPVC) having a degree of chlorination of 67%. 95 parts of this chlorinated vinyl chloride resin has a degree of polymerization of 14
5 parts of a vinyl chloride paste resin (paste resin (1)) obtained by emulsion polymerization and having a particle diameter of 37 μm after spray-drying at 00, MBS (B561 manufactured by Kanegafuchi Chemical Co., Ltd.) 6
Parts and a chlorinated polyethylene having a chlorine content of 35% (C
PE), 2 parts of octyltin mercapto as a stabilizer, 2 parts of polyethylene wax as a lubricant, and 5 parts of titanium dioxide as a filler were blended to obtain a uniform mixture.

The blended composition was rolled at a temperature of 200 ° C.
And kneaded for 3 minutes at a temperature of 2 ° C.
It was pressed at 00 ° C. for 10 minutes and subjected to the following physical property tests. When the Charpy impact test was performed at 23 ° C. and 0 ° C. according to JIS-K-7111, the results were 23 ° C. and 0 ° C.
Impact test values of 23.6 kg · cm
/ Cm ² and 16.0 kg · cm / cm ² . In order to evaluate the flow characteristics, the amount of the roll sheet flowing at 200 ° C. under a load of 300 kg in a thin tube having a length of 10 mm and a diameter of 1 mm was measured (Method B flow test). 2.4 × 10 per second
A flow rate of ^-2 cc was obtained and the flow characteristics were found to be good.

Example 2 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. To 90 parts of this chlorinated vinyl chloride resin, 10 parts of a vinyl chloride paste resin obtained by emulsion polymerization having a degree of polymerization of 1400 and a particle diameter of 37 μm after spray drying, MBS (Baneka Chemical Industry Co., Ltd.)
561) 6 parts, and 3 parts of chlorinated polyethylene having a chlorine content of 35%, 3 parts of octyltin mercapto as a stabilizer, 2 parts of polyethylene wax as a lubricant, and 5 parts of titanium dioxide as a filler are added. Blending was performed to obtain a uniform formulation.

The blend formulation is rolled at a temperature of 200 ° C.
And kneaded for 3 minutes at a temperature of 2 ° C.
It was pressed at 00 ° C. for 10 minutes and subjected to the following physical property tests. Was subjected to a Charpy impact test in the same manner as in Example 1, the Charpy impact test value at 23 ° C. and 0 ℃, respectively 24.9kg · cm / cm ² and 16.2kg · cm / cm ²
Met. A flow test of method B was performed in the same manner as in Example 1. As a result, a flow rate of 2.5 × 10 ⁻² cc / sec was obtained, and it was found that the flow characteristics were good.

Example 3 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. 90 parts of the chlorinated vinyl chloride resin, 10 parts of a vinyl chloride paste resin (paste resin (2)) obtained by emulsion polymerization, having a degree of polymerization of 800 and a particle diameter of 35 μm after spray drying, MBS
(B561 manufactured by Kanegafuchi Chemical Co., Ltd.), 6 parts of chlorinated polyethylene having a chlorine content of 35%, 3 parts of octyltin mercapto as a stabilizer, 2 parts of polyethylene wax as a lubricant, and titanium dioxide as a filler. 5 parts were added. This mixture was blended to obtain a uniform blend.

The blend formulation is rolled at a temperature of 200 ° C.
And kneaded for 3 minutes at a temperature of 2 ° C.
It was pressed at 00 ° C. for 10 minutes and subjected to the following physical property tests. Was subjected to a Charpy impact test in the same manner as in Example 1, the Charpy impact test value at 23 ° C. and 0 ℃, respectively 22.6kg · cm / cm ² and 17.0kg · cm / cm ²
Met. A flow test of Method B was performed in the same manner as in Example 1. As a result, a flow rate of 2.1 × 10 ^-2 cc / sec was obtained, and it was found that the flow characteristics were good.

Example 4 A vinyl chloride resin having a polymerization degree of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a chlorination degree of 67%. To 95 parts of this chlorinated vinyl chloride resin, 5 parts of a vinyl chloride paste resin obtained by emulsion polymerization having a degree of polymerization of 1400 and a particle diameter of 37 μm after spray drying, MBS (B2 manufactured by Kaneguchi Chemical Co., Ltd.)
2) 8 parts and 3 parts of chlorinated polyethylene having a chlorine content of 35% were added, and octyltin mercapto 2 was further used as a stabilizer.
Parts, 2 parts of polyethylene wax as a lubricant and 5 parts of titanium dioxide as a filler. This mixture was blended to obtain a uniform blend.

[0025] The blend formulation is rolled at a temperature of 200 ° C.
And kneaded for 3 minutes at a temperature of 2 ° C.
It was pressed at 00 ° C. for 10 minutes and subjected to the following physical property tests. Was subjected to a Charpy impact test in the same manner as in Example 1, the Charpy impact test value at 23 ° C. and 0 ℃, respectively 24.9kg · cm / cm ² and 17.0kg · cm / cm ²
Met. A flow test of Method B was performed in the same manner as in Example 1. As a result, a flow rate of 2.1 × 10 ^-2 cc / sec was obtained, and it was found that the flow characteristics were good.

Comparative Example 1 A vinyl chloride resin having a polymerization degree of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a chlorination degree of 67%. To 100 parts of the chlorinated vinyl chloride resin, 6 parts of MBS (B561 manufactured by Kanegafuchi Chemical Co., Ltd.) and 3 parts of chlorinated polyethylene having a chlorine content of 35% were added, and 2 parts of octyltin mercapto was used as a stabilizer, and polyethylene was used as a lubricant. 2 parts of wax and 5 parts of titanium dioxide as filler were added. This mixture was blended to obtain a uniform blend.

The blend was rolled at a temperature of 200 ° C.
And kneaded for 3 minutes at a temperature of 2 ° C.
It was pressed at 00 ° C. for 10 minutes and subjected to the following physical property tests. When the Charpy impact test was conducted in the same manner as in Example 1, the Charpy impact test values at 23 ° C. and 0 ° C. were 22.7 kg · cm / cm ² and 14.8 kg · cm / cm ^{2, respectively.}
Met. When the method B flow test was performed in the same manner as in Example 1, a flow rate of 1.7 × 10 ⁻² cc / sec was obtained, and the flow characteristics were not so good.

Comparative Example 2 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. To 100 parts of this chlorinated vinyl chloride resin, 8 parts of MBS (B22 manufactured by Kaneka Chemical Industry Co., Ltd.) and 3 parts of chlorinated polyethylene having a chlorine content of 35% were added, 2 parts of octyltin mercapto was used as a stabilizer, and polyethylene was used as a lubricant. 2 parts of wax and 5 parts of titanium dioxide as filler were added. This mixture was blended to obtain a uniform blend.

The blend was rolled at 200 ° C.
And kneaded for 3 minutes at a temperature of 2 ° C.
It was pressed at 00 ° C. for 10 minutes and subjected to the following physical property tests. Was subjected to a Charpy impact test in the same manner as in Example 1, the Charpy impact test value at 23 ° C. and 0 ℃, respectively 24.1kg · cm / cm ² and 16.4kg · cm / cm ²
Met. When the method B flow test was performed in the same manner as in Example 1, a flow rate of 1.5 × 10 ⁻² cc / sec was obtained, and the flow characteristics were not so good.

Comparative Example 3 A vinyl chloride resin having a polymerization degree of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a chlorination degree of 67%. To 90 parts of this chlorinated vinyl chloride resin, 10 parts of a vinyl chloride resin (PVC) obtained by suspension polymerization having a degree of polymerization of 1000 and a particle size of 1300 μm, and MBS (Kanebuchi Chemical Industries B56)
1) 6 parts and 3 parts of chlorinated polyethylene having a chlorine content of 35% were added, and octyltin mercapto 2 was further used as a stabilizer.
Parts, 2 parts of polyethylene wax as a lubricant and 5 parts of titanium dioxide as a filler. This mixture was blended to obtain a uniform blend.

The blend composition is rolled at a temperature of 200 ° C.
And kneaded for 3 minutes at a temperature of 2 ° C.
It pressed at 00 degreeC for 10 minutes, and was subjected to the physical property test. When a Charpy impact test was performed in the same manner as in Example 1, the result was 23.
The Charpy impact test values at 0 ° C and 0 ° C were 2
It was 3.6 kg · cm / cm ² and 16.8 kg · cm / cm ² . When a method B flow test was performed in the same manner as in Example 1,
A flow rate of 1.8 × 10 ^-2 cc per second was obtained and the flow characteristics were not very good.

Example 5 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. To 95 parts of this chlorinated vinyl chloride resin, 5 parts of a vinyl chloride paste resin obtained by emulsion polymerization having a degree of polymerization of 1400 and a particle diameter of 37 μm after spray drying, MBS (B5 manufactured by Kaneguchi Chemical Co., Ltd.)
61) Add 6 parts and 3 parts of chlorinated polyethylene having a chlorine content of 35%, further add 3 parts of octyltin mercapto as a stabilizer, 2 parts of polyethylene wax as a lubricant, 5 parts of titanium dioxide as a filler, and a yellow colorant 0.00
8 parts were added. The mixture was heated to 130 ° C. in a 300 liter super mixer and blended to obtain a uniform mixture.

This composition was extruded with a Toshiba TEC conical extruder to produce a 1-inch diameter pipe. At this time, the die pressure was 300 kg / cm ² and the discharge amount was 69 kg.
/ Hr. 23 ° C according to JIS-K-7111
And 0 ° C., the Charpy impact strength of this pipe was measured to be 33 kg · cm / cm ² and 21 kg · cm ² , respectively.
/ Cm ² . According to JIS-K-7206, when the Vicat softening point of this pipe at a load of 1 kg was examined,
127.0 ° C. When a tensile test was performed at 23 ° C. in accordance with JIS-K-7113, the maximum tensile strength was 568 kg / cm ² and the elongation at break was 120%. The surface of the pipe has no visual redness, is extremely smooth (AA), and is considered to have good thermal stability and surface properties.

Example 6 A vinyl chloride resin having a polymerization degree of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a chlorination degree of 67%. To 95 parts of this chlorinated vinyl chloride resin, 5 parts of a vinyl chloride paste resin obtained by emulsion polymerization having a degree of polymerization of 1400 and a particle diameter of 37 μm after spray drying, MBS (B2 manufactured by Kaneguchi Chemical Co., Ltd.)
2) 8 parts and 3 parts of chlorinated polyethylene having a chlorine content of 35% were added, and 3 parts of octyltin mercapto as a stabilizer, 2 parts of polyethylene wax as a lubricant, 5 parts of titanium dioxide as a filler, and 0 parts of a yellow colorant were added. .008 parts were added. The mixture was heated to 130 ° C. in a 300 liter super mixer and blended to obtain a uniform mixture.

This compound was extruded with a TEC conical extruder manufactured by Toshiba to produce a 1-inch diameter pipe extrusion.
At this time, the die pressure was 300 kg / cm ² and the discharge rate was 72 kg / hr. According to JIS-K-7111,
When the Charpy impact strength of this pipe was measured at 23 ° C. and 0 ° C., it was 34 kg · cm / cm ² and 22 k, respectively.
g · cm / cm ² . According to JIS-K-7206,
When the Vicat softening point of this pipe at a load of 1 kg was examined, it was 127.0 ° C. Also, JIS-K-711
When a tensile test was conducted at 23 ° C. according to No. 3, the maximum tensile strength was 560 kg / cm ² and the elongation at break was 120%. The surface of the pipe has no visual redness, is extremely smooth (AA), and is considered to have good thermal stability and surface properties.

Example 7 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. To 95 parts of this chlorinated vinyl chloride resin, 5 parts of a vinyl chloride paste resin obtained by emulsion polymerization having a degree of polymerization of 1400 and a particle diameter of 37 μm after spray drying, MBS (B2 manufactured by Kaneguchi Chemical Co., Ltd.)
2) 10 parts were added, 3 parts of octyltin mercapto as a stabilizer, 2 parts of polyethylene wax as a lubricant, 5 parts of titanium dioxide as a filler, and 0.00 of a yellow colorant.
8 parts were added. The mixture was heated to 130 ° C. in a 300 liter super mixer and blended to obtain a uniform mixture.

This compound was extruded with a TEC conical extruder manufactured by Toshiba to produce a 1-inch diameter pipe. At this time, the die pressure is 300 kg / cm ² and the discharge amount is 68 k / cm ^2.
g / hr. When the Charpy impact strength of this pipe at 23 ° C. and 0 ° C. was measured according to JIS-K-7111, it was 34 kg · cm / cm ² and 22 kg, respectively.
Cm / cm ² . According to JIS-K-7206,
When the Vicat softening point of this pipe at a load of 1 kg was examined, it was 127.1 ° C. Also, JIS-K-711
When a tensile test was conducted at 23 ° C. according to No. 3, the maximum tensile strength was 574 kg / cm ² and the elongation at break was 114%. The surface of the pipe has no visual redness, is extremely smooth (AA), and is considered to have good thermal stability and surface properties.

Comparative Example 4 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. To 100 parts of this chlorinated vinyl chloride resin, 6 parts of MBS (B561 manufactured by Kaneka Chemical Industry Co., Ltd.) and 3 parts of chlorinated polyethylene having a chlorine content of 35% were added, and 3 parts of octyltin mercapto was used as a stabilizer, and polyethylene was used as a lubricant. 2 parts of wax, 5 parts of titanium dioxide as filler, and 0.00 of yellow colorant
8 parts were added. The mixture was heated to 130 ° C. in a 300 liter super mixer and blended to obtain a uniform mixture.

This compound was extruded with a TEC conical extruder manufactured by Toshiba to produce a 1-inch diameter pipe. At this time, the die pressure was 300 kg / cm ² and the discharge amount was 54 kg.
/ Hr. 23 ° C according to JIS-K-7111
When the Charpy impact strength of this pipe was measured at 31 ° C. and 0 ° C., it was 31 kg · cm / cm ² and 21 kg · cm ² , respectively.
/ Cm ² . According to JIS-K-7206, when the Vicat softening point of this pipe at a load of 1 kg was examined,
127.4 ° C. When a tensile test was conducted at 23 ° C. in accordance with JIS-K-7113, the maximum tensile strength was 560 kg / cm ² and the elongation at break was 125%. The surface of the pipe is not visually reddish, but has a rough feeling (A), and although the thermal stability is good, it is considered that the surface properties are slightly inferior.

Comparative Example 5 A vinyl chloride resin having a degree of polymerization of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a degree of chlorination of 67%. To 100 parts of the chlorinated vinyl chloride resin, 8 parts of MBS (B22 manufactured by Kanegafuchi Chemical Co., Ltd.) and 3 parts of chlorinated polyethylene having a chlorine content of 35% were added, and 3 parts of octyltin mercapto as a stabilizer and 3 parts of a lubricant were added. 2 parts of polyethylene wax, 5 parts of titanium dioxide as filler, and 0.00 of yellow colorant
8 parts were added. The mixture was heated to 130 ° C. in a 300 liter super mixer and blended to obtain a uniform mixture.

This compound was extruded with a TEC conical extruder manufactured by Toshiba to produce a 1-inch diameter pipe. At this time, the die pressure was 300 kg / cm ² and the discharge amount was 65 kg.
/ Hr. 23 ° C according to JIS-K-7111
And 0 ° C., the Charpy impact strength of this pipe was measured to be 34 kg · cm / cm ² and 23 kg · cm ² , respectively.
/ Cm ² . According to JIS-K-7206, when the Vicat softening point of this pipe at a load of 1 kg was examined,
127.4 ° C. When a tensile test was conducted at 23 ° C. according to JIS-K-7113, the maximum tensile strength was 559 kg / cm ² and the elongation at break was 125%. The surface of the pipe is not visually reddish, but has a rough feeling (A), and although the thermal stability is good, it is considered that the surface properties are slightly inferior.

Comparative Example 6 A vinyl chloride resin having a polymerization degree of 1000 was post-chlorinated to obtain a chlorinated vinyl chloride resin having a chlorination degree of 67%. To 100 parts of the chlorinated vinyl chloride resin, 10 parts of MBS (manufactured by Kaneka Chemical Industry Co., Ltd.) was added, and 3 parts of octyltin mercapto was used as a stabilizer, and 2 parts of polyethylene wax was used as a lubricant.
5 parts of titanium dioxide as filler and yellow colorant
Parts were added. The mixture was heated to 130 ° C. in a 300 liter super mixer and blended to obtain a uniform mixture.

This compound was extruded with a TEC conical extruder manufactured by Toshiba to produce a 1-inch diameter pipe. At this time, the die pressure was 300 kg / cm ² and the discharge amount was 52 kg.
/ Hr. 23 ° C according to JIS-K-7111
And 0 ° C., the Charpy impact strength of this pipe was measured to be 32 kg · cm / cm ² and 22 kg · cm ² , respectively.
/ Cm ² . According to JIS-K-7206, when the Vicat softening point of this pipe at a load of 1 kg was examined,
127.1 ° C. When a tensile test was performed at 23 ° C. in accordance with JIS-K-7113, the maximum tensile strength was 578 kg / cm ² and the elongation at break was 104%. The surface of the pipe is slightly reddish visually, and the surface is rough (B), and it is considered that both the thermal stability and the surface properties are inferior.

For easy understanding, the contents and results of the above Examples and Comparative Examples are shown in Tables 1 and 2.

[Table 1]

[0045]

[Table 2]

As is clear from the results of Examples 1 to 4,
It can be seen that the chlorinated vinyl chloride-based resin composition containing the vinyl chloride-based paste resin improves the fluidity without sacrificing the impact strength of the obtained molded article. Examples 5 to 7
As is clear from the results, the chlorinated vinyl chloride resin composition containing the vinyl chloride paste resin can significantly increase the discharge rate without sacrificing impact strength, tensile test, heat resistance in pipe extrusion. Thus, a pipe having excellent surface properties can be manufactured.

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Claims (5)

[Claims] 1. A chlorinated vinyl chloride resin having a degree of polymerization before chlorination of 600 to 1500 and a chlorination degree of 62 to 70% by weight, and 80 to 99 parts by weight, and emulsion polymerization or fine suspension polymerization. The manufactured particle diameter after spray drying is 5-1
Resin component 1 containing 1 to 20 parts by weight of a vinyl chloride paste resin having a polymerization degree of 600 to 2100
A chlorinated vinyl chloride resin composition comprising 00 parts by weight and 3 to 15 parts by weight of a shock absorber. 2. The chlorinated vinyl chloride resin composition according to claim 1, wherein the amount of the chlorinated vinyl chloride resin is at least 90 parts by weight and the amount of the vinyl chloride paste resin is 10 parts by weight or less. 3. The method according to claim 1, wherein the shock absorbing agent is methyl methacrylate.
3. The chlorinated vinyl chloride resin composition according to claim 1, comprising 4 to 12 parts by weight of a butadiene-styrene copolymer and 1 to 5 parts by weight of a chlorinated polyethylene having a chlorine content of 10 to 50% by weight. . 4. The chlorinated vinyl chloride resin composition according to claim 3, wherein the chlorinated polyethylene has a chlorine content of 30 to 40% by weight. 5. The method according to claim 1, wherein the shock absorber comprises methyl methacrylate.
The chlorinated vinyl chloride resin composition according to claim 1, comprising only a butadiene-styrene copolymer.