Composite auxiliary agent for random copolymerized polypropylene pipe material

Abstract

The invention relates to a composite auxiliary agent for a random copolymerized polypropylene pipe material, which is polymerized by a liquid phase bulk single-loop pipe reactor. The composite auxiliary agent is compounded by the following compound systems in portion by weight: 10 to 40 portions of long-term ageing resistant auxiliary agent, 10 to 30 portions of processing auxiliary agent, 20 to 50 portions of crystal shape transforming agent, and 10 to 30 portions of weather resisting agent, wherein the long-term ageing resistant auxiliary agent is a compound system of a lactone stabilizer, ahindered phenol antioxidant and a nontoxic amine antioxidant; the processing auxiliary agent is one or a mixture of several of fluorine elastomer or low-molecular polymers in random proportion; the weather resisting agent is a compound system of an ultraviolet absorbent in a light stabilizer, an organic nickel stabilizer and a hindered amine stabilizer; and the crystal shape transforming agent isa crystal shape transforming agent transformed from an alpha crystal shape to a beta crystal shape. Therefore, the processing property, the mechanical property, the environmental stress cracking resistance and the long-term ageing resistance of random copolymerized polypropylene resin are remarkably improved.

Description

Technical field: [0001] The invention relates to a composite auxiliary agent for random copolymerized polypropylene pipes polymerized in a liquid-phase bulk method single-loop reactor. Background technique: [0002] Random copolymerization PPR hot water pipe special material is another new type of thermoplastic pipe special material after cross-linked polyethylene (PEX) and polybutylene (PB) pipe special materials. The PPR hot water pipe produced by it has energy-saving , sanitation, corrosion resistance, heat resistance, pressure resistance, long service life, convenient installation, reliable connection, recyclable materials, etc., widely used in hot water pipes, pipes for hot water heating systems, industrial hot water pipes, hot springs Water pipes, solar residential warm water pipes, etc. [0003] PPR pipes originated in Europe. In the 1990s, the German company KRAVSSMAFFEI successfully developed the world's first propylene copolymer pipe production line. Due to the s...

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Problems solved by technology

[0005] --Qiu Xiangyu ("Engineering Plastics Application" 30(2), 2002, p28~30) reported that the PP-R hot water pipe material developed by the Research Institute of Yangzi Petrochemical Co., Ltd. passed the 1050-hour test with a static pressure resistance of 3.5Mpa , but due to the high degree of crystallinity, the welded area of ​​the pipe is prone to fracture due to impact and other external forces during use