KR-102963506-B1 - Chlorinated vinyl chloride-based resin composition and chlorinated vinyl chloride-based resin molded body

Abstract

The present invention provides a chlorinated vinyl chloride-based resin composition capable of producing a molded article having excellent discoloration resistance and corrosion resistance, and having a low amount of metal leaching, which is unlikely to cause environmental pollution, and a chlorinated vinyl chloride-based resin molded article. The present invention is a chlorinated vinyl chloride resin composition comprising a chlorinated vinyl chloride resin, a heat stabilizer, and at least one thioglycolic acid-based compound selected from the group consisting of thioglycolic acid and esters of thioglycolic acid.

Inventors

• 마츠무라 겐이치

Assignees

• 세키스이가가쿠 고교가부시키가이샤

Dates

Publication Date

20260511

Application Date

20200828

Priority Date

20190830

Claims (6)

1. The chlorinated vinyl chloride-based resin comprises a heat stabilizer and at least one thioglycolic acid-based compound selected from the group consisting of thioglycolic acid and esters of thioglycolic acid, wherein the chlorinated vinyl chloride-based resin has constituent units (a) to (c) represented by the following formulas (a) to (c). The mass (parts by mass) equivalent to a constituent unit (b) per 100 parts by mass of chlorinated vinyl chloride resin is 5 parts by mass or more and 35 parts by mass or less, and A ratio of the content of a thioglycolic acid-based compound to the mass equivalent of a constituent unit (b) of a chlorinated vinyl chloride-based resin to 0.0001 to 1.5, Chlorinated vinyl chloride-based resin composition.
2. In Article 1, A chlorinated vinyl chloride resin composition having a thioglycolic acid-based compound content of 0.001 mass% or more.
3. In Article 1 or Article 2, A chlorinated vinyl chloride resin composition characterized in that the mass ratio of the content of a thioglycolic acid-based compound to the content of a heat stabilizer (content of thioglycolic acid-based compound / content of heat stabilizer) is 0.001 to 10.0.
4. In Article 1 or Article 2, A chlorinated vinyl chloride resin composition in which the thioglycolic acid-based compound is at least one selected from the group represented by HSCH 2 COOR (R represents H or an alkyl group).
5. In Article 1 or Article 2, A heat stabilizer is a chlorinated vinyl chloride-based resin composition containing tin.
6. The chlorinated vinyl chloride-based resin comprises a heat stabilizer and at least one thioglycolic acid-based compound selected from the group consisting of thioglycolic acid and esters of thioglycolic acid, wherein the chlorinated vinyl chloride-based resin has constituent units (a) to (c) represented by the following formulas (a) to (c). The mass (parts by mass) equivalent to a constituent unit (b) per 100 parts by mass of chlorinated vinyl chloride resin is 5 parts by mass or more and 35 parts by mass or less, and A ratio of the content of a thioglycolic acid-based compound to the mass equivalent of a constituent unit (b) of a chlorinated vinyl chloride-based resin to 0.0001 to 1.5, Chlorinated vinyl chloride-based resin molded article.

Description

Chlorinated vinyl chloride-based resin composition and chlorinated vinyl chloride-based resin molded body The present invention relates to a chlorinated vinyl chloride-based resin composition and a chlorinated vinyl chloride-based resin molded article. Conventionally, vinyl chloride resin (hereinafter referred to as PVC) is a material with excellent mechanical strength, weather resistance, and chemical resistance, and is used in many fields. However, since its heat resistance is inferior, chlorinated vinyl chloride resin (hereinafter referred to as CPVC) with improved heat resistance by chlorinating PVC is being developed. Because PVC has a low heat distortion temperature and an upper limit temperature of 60 to 70°C for usability, it cannot be used with hot water. In contrast, CPVC has a heat distortion temperature 20 to 40°C higher than PVC, so it can be used with hot water and is preferably used, for example, in heat-resistant joints, heat-resistant pipes, heat-resistant valves, heat-resistant plates, etc. On the other hand, in order to improve various performance characteristics such as thermal stability and color resistance, it is common for a heat stabilizer to be added to CPVC before melt molding. For example, Patent Document 1 discloses a chlorinated vinyl chloride resin composition in which a predetermined amount of chlorinated polyethylene, an organotin-based heat stabilizer, and an inorganic stabilizer are added to a chlorinated vinyl chloride resin to impart thermal stability, thermoformability, etc. In addition, Patent Document 2 discloses a halogen-containing polymer composition in which a predetermined amount of a salt of a polymeric polyacid is added to an alkyl tin stabilizer for the purpose of improving the performance of an alkyl tin compound. The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples. [Example 1] (Preparation of chlorinated vinyl chloride resin composition) For 100 parts by mass of chlorinated vinyl chloride resin [amount of chlorination: 67.2 mass%, amount of additional chlorination: 10.4 mass%, degree of polymerization: 1000], 0.6 parts by mass of a butyltin mercaptan-based compound (manufactured by Nitto Chemical Co., Ltd., TVS #1380, dibutyltin mercaptide) was added as a heat stabilizer. In addition, 0.5 parts by mass of thioglycolic acid 2-ethylhexyl (manufactured by Fujifilm Wako Junyaku Co., Ltd.) and 0.5 parts by mass of montanic acid partial saponification ester (manufactured by Clariant Japan, Ricowax OP) were added as a lubricant, and then uniformly mixed with a super mixer to obtain a chlorinated vinyl chloride-based resin composition. In addition, for the obtained chlorinated vinyl chloride resin, the content (mol%) of constituent unit (b) and the mass equivalent (parts by mass) of constituent unit (b) were measured using FT-NMR JEOLJNM-AL-300. NMR analysis can be performed in accordance with the method described in R. A. Komoroski, R. G. Parker, J. P. Shocker, Macromolecules, 1985, 18, 1257-1265. (Production of chlorinated vinyl chloride resin molded bodies) The obtained chlorinated vinyl chloride resin composition was fed into a 50 mm diameter biaxial bidirectional conical extruder (manufactured by Osada Seisakusho, SLM-50), and a sheet-shaped chlorinated vinyl chloride resin molded body was produced using a mold with a thickness of 2 mm and a width of 80 mm at a resin temperature of 210 ℃ and an extrusion rate of 30 kg/hr. [Example 2] A chlorinated vinyl chloride-based resin composition and a chlorinated vinyl chloride-based resin molded article were prepared in the same manner as in Example 1, except that the amount of 2-ethylhexyl thioglycolate (manufactured by Fujifilm Wako Junyaku Co., Ltd.) added was 5 parts by mass. [Examples 3 to 8] A chlorinated vinyl chloride resin composition and a chlorinated vinyl chloride resin molded article were prepared in the same manner as in Example 1, except that a chlorinated vinyl chloride resin having the degree of polymerization, amount of additional chlorination, and content of component (b) shown in Table 1 was used. [Examples 9 ~ 10] A chlorinated vinyl chloride resin composition and a chlorinated vinyl chloride resin molded article were prepared in the same manner as in Example 1, except that the amount of butyl tin mercaptan-based compound (manufactured by Nitto Chemical Co., Ltd., TVS #1380) added was changed to the amount shown in Table 1. [Examples 11 ~ 12] A chlorinated vinyl chloride resin composition and a chlorinated vinyl chloride resin molded article were prepared in the same manner as in Example 1, except that a heat stabilizer of the type and amount shown in Table 2 was used instead of a butyltin mercaptan-based compound (manufactured by Nitto Chemical Co., Ltd., TVS #1380). In addition, "STANN RC-709, manufactured by Nitto Chemical Co., Ltd." was used as the dibutyl tin maleate compound, and "NT-231, manufacture