JPH09316267A - Chlorinated vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition hardly sticking a solid substance blackened by deterioration of a resin inside a mold, comprising a chlorinated vinyl chloride resin, an organotin-based stabilizer, an oxidation type polyethylene wax, a modifier, a lubricant and a processing auxiliary. SOLUTION: This composition comprises (A) 100 pts.wt. of a chlorinated vinyl chloride resin, (B) 0.1-5 pts.wt. of an organotin-based stabilizer, (C) 0.1-1 pt.wt. of an oxidation type polyethylene wax, (D) a modifier, (E) a lubricant, (F) a processing auxiliary and (G) a pigment. In the composition, the component C contained in the component G may be used and, in this case, the amount of the component C added is preferably 30-80wt.%.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a chlorinated vinyl chloride resin composition.

[0002]

2. Description of the Related Art A pipe material used for a plant ultrapure water pipe is formed so as to obtain a smooth surface by minimizing irregularities on the inner surface of the pipe in order to prevent bacterial growth on the inner surface of the pipe. However, such a pipe material, when the extrusion time is the same as a general vinyl chloride resin composition for the passage time in the extruder and the mold, since the irregularities on the inner surface of the pipe become large,
The time required for passage through the extruder and mold is 2
It is molded more than twice as long. Therefore, the resin is likely to undergo a considerable thermal history and be easily thermally decomposed.

Recently, there has been a demand for ultrapure water piping for heat resistant plants, which can be easily cleaned by heat sterilization. A chlorinated vinyl chloride resin is used for such applications, but the chlorinated vinyl chloride resin has the drawbacks of high molding temperature and poor fluidity.

Further, as the quality required for the ultrapure water piping for plants, the elution amount of impurities such as metal ions and TOC is regulated so as not to adversely affect the water quality of ultrapure water. As a result, since the amount of metal used is limited, the types and amounts of stabilizers, lubricants, and other compounding agents are restricted, and the fluidity of the resin is reduced and the resin is more likely to deteriorate. .

When the resin is deteriorated, the deteriorated resin easily adheres to a metal surface of a mold or the like, which becomes black and becomes a solid over time, and the solid adheres to the product to deteriorate the appearance. There is a problem in that it may cause damage to the product. Therefore, when such a solid material is generated, it is necessary to discontinue the production in the middle and dismantle the mold to remove the solid material. there were.

[0006]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and an object thereof is chlorination chlorination in which a blackened solid substance generated due to deterioration of resin in a mold is hard to adhere. It is to provide a vinyl resin composition.

[0007]

The chlorinated vinyl chloride resin composition of the present invention comprises a chlorinated vinyl chloride resin, an organotin stabilizer, an oxidized polyethylene wax, a modifier, a lubricant, a processing aid and a pigment. It is characterized by

The chlorinated vinyl chloride resin used in the present invention is generally used for pipe extrusion molding.

The organotin stabilizers used in the present invention are those conventionally used, for example, laurate stabilizers such as dibutyltin laurate; maleate stabilizers such as dibutyltin maleate; dibutyltin. Examples thereof include mercaptide-based stabilizers such as mercaptide and dioctyltin mercaptide; and sulfide-based stabilizers such as monobutyltin sulfide.

When the amount of the above-mentioned organotin stabilizer used is small, the stabilizing effect cannot be obtained, and when it exceeds a certain amount, the stabilizing effect is almost unchanged. Therefore, it is based on 100 parts by weight of the chlorinated vinyl chloride resin. , 0.1 to 5 parts by weight.

The oxidized polyethylene wax used in the present invention is a low molecular weight polyethylene having a carboxyl group introduced therein. The oxidized polyethylene wax has a high affinity with the chlorinated vinyl chloride resin due to the albixyl group, so that the surface of the molten chlorinated vinyl chloride molecule is coated with the carboxyl group. Further, the carboxyl group has a strong affinity with metals and has a property of coating the surface of a cylinder or a mold.

If the content of the above-mentioned carboxyl group is small or large, the effect of preventing the plate-out phenomenon in which the solid matter adheres to the tip of the mold cannot be obtained, so that the acid value is in the range of 6 to 16 mgKOH. Those are preferable.

When the amount of the above-mentioned oxidized polyethylene wax used is small, the effect of preventing the adhesion of the blackened solid matter in the mold cannot be obtained, and when it is too large, the flow of the molten resin becomes poor and extrusion molding becomes difficult. Therefore, it is 0.1 to 1 part by weight with respect to 100 parts by weight of the chlorinated vinyl chloride resin.

Commercially available products of the above-mentioned oxidized polyethylene wax are, for example, "AC307" manufactured by Allied Chemical Company.
(Acid value 7 mgKOH).

Examples of the modifier used in the present invention include chlorinated polyethylene.

The lubricant used in the present invention improves the fluidity of the resin and at the same time reduces the friction resistance with the die surface of the extruder to prevent sticking and facilitates the molding process. Examples of the lubricant include higher fatty acids such as stearic acid and palmitic acid and their derivatives; metal soaps, carnauba wax,
Natural waxes such as candelilla wax; synthetic waxes such as low polymerization polyethylene; petroleum waxes such as paraffin wax.

In the resin composition of the present invention, an oxidized polyethylene wax contained in the pigment may be used.
When the amount of the oxidized polyethylene wax in the pigment is small, the effect of preventing the adhesion of the blackened solid matter in the mold cannot be obtained, and when the amount is large, the resin flow is deteriorated.
Limited to 80% by weight.

(Function) In the resin composition of the present invention, a carboxyl group-introduced oxidized polyethylene wax is used. This carboxyl group enhances the affinity between the chlorinated vinyl chloride resin and polyethylene molecules, and coats the surface of the molten chlorinated vinyl chloride resin. On the other hand, this carboxyl group has a strong affinity with metals, and since the oxidized polyethylene wax covers the surface of the mold, the molten chlorinated vinyl chloride resin and the mold are separated, and the resin is applied to the mold surface. Prevents adhesion. Further, this oxidized polyethylene wax has a high effect even when used in a small amount, and when added in a small amount, the heat stabilizing effect is improved and the deterioration itself of the resin is delayed. For the above reasons, it is considered that the blackened solid matter is less likely to adhere due to the deterioration of the resin in the mold.

[0019]

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 and 2 and Comparative Examples 1 and 2) A resin composition prepared by uniformly mixing the components in the amounts shown in Table 1 was set at a barrel temperature of 170 ° C. and a mold temperature of 215 ° C. of 50 mm.
Supply to a twin-screw different direction extruder, screw rotation speed 23r
After extrusion molding for 80 minutes under conditions of pm and extrusion rate of 16 kg / hr, the presence or absence of blackened solid matter adhering to the tip of the mold was visually observed. In the table, those in which no solid matter was observed were indicated by ◯, those in which slight solid matter was observed were indicated by Δ, and those in which solid matter was clearly observed were indicated by x.

[0021]

[Table 1]

From the results shown in Table 1, a large amount of solids was observed in Comparative Example 1 containing no oxidized polyethylene wax, but in Examples 1 and 2 containing an appropriate amount of oxidized polyethylene wax, no solid was found. I was not able to admit. Comparative Example 2 containing 1.5 parts by weight of oxidized polyethylene wax
Was unable to be extruded due to the large load.

[0023]

EFFECTS OF THE INVENTION The chlorinated vinyl chloride resin composition of the present invention is stable for a long period of time because the blackened solid matter is less likely to adhere to the chlorinated vinyl chloride resin due to the deterioration of the resin in the mold by incorporating the oxidized polyethylene wax. Continuous production is possible,
The work of removing solids is extremely reduced. Moreover, since the compounding amount of the organotin stabilizer is 0.1 to 5 parts by weight with respect to 100 parts by weight of the chlorinated vinyl chloride resin, it does not adversely affect the water quality of the ultrapure water.

Claims (2)

[Claims] 1. A chlorinated vinyl chloride resin 100 parts by weight, an organotin stabilizer 0.1 to 5 parts by weight, an oxidized polyethylene wax 0.1 to 1 part by weight, a modifier, a lubricant, a processing aid and a pigment. A chlorinated vinyl chloride resin composition comprising: 2. A chlorinated vinyl chloride resin composition comprising 100 parts by weight of a chlorinated vinyl chloride resin, 0.1 to 5 parts by weight of an organotin stabilizer, a modifier, a lubricant, a processing aid and a pigment. , 30 to 8 oxidized polyethylene wax in the pigment
A chlorinated vinyl chloride resin composition containing 0% by weight.