Double-orientation fiber-reinforced polypropylene randon copolymer three-layer composite tube

Abstract

The invention relates to a double-orientation fiber-reinforced polypropylene randon copolymer three-layer composite tube which is characterized by comprising a polypropylene randon copolymer tube wall outer layer (1), a polypropylene randon copolymer tube wall inner layer (6) and double-orientation fiber-reinforced layers, wherein an annular fiber-reinforced layer (2) and an axial fiber-reinforced layer (3) are arranged between the tube wall outer layer (1) and the tube wall inner layer (2). The double-orientation fiber-reinforced polypropylene randon copolymer three-layer composite tube has the advantages of improving the pressure-resistant property of tube materials by introducing the annular fiber-reinforced layer; and reducing the linear expansion coefficients of the tube materials by introducing the axial fiber-reinforced layer. Under the premise that the high pressure-resistant property of the tube materials is ensured by adjusting the length of glass fibers, the linear expansion coefficients can be reduces to 1 / 3 to 1 / 4. Fiber-reinforced layer resins are made of toughening polypropylene randon copolymer, so that the low-temperature anti-shock performance of the tube mateirals is improved. The double-orientation fiber-reinforced polypropylene randon copolymer three-layer composite tube can be used in cold and hot water tubes, main vertical tubes of buildings and other industrial tubes.

Description

【Technical field】 [0001] The invention relates to the technical field of pipes, in particular to a double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe. 【Background technique】 [0002] Random copolymer polypropylene (PP-R) pipes are accepted by the market because of their good application characteristics such as sanitation, environmental protection, and reliable hot-melt connection. And favored by domestic users. However, due to the large linear expansion coefficient of PP-R pipes in engineering applications, the pipes are easily deformed when used in hot water systems; when simple PP-R pipes are used in main risers, the compressive strength is slightly insufficient, etc., and many of the above defects This restricts the further popularization and application of PP-R pipes in my country's building water supply market. Simple axial fiber reinforcement of PP-R pipes can significantly reduce the linear expansion coefficient of the pipe...

AI Technical Summary

Problems solved by technology

However, due to the large linear expansion coefficient of PP-R pipes in engineering applications, the pipes are easily deformed when used in hot water systems; when simple PP-R pipes are used in main risers, the compressive strength is slightly insufficient, etc., and many of the above defects It limits the further promotion and application of PP-R pipes in my country's building water supply market

Simple axial fiber reinforcement of PP-R pipes can significantly reduce the linear expansion coefficient of the pipes, but reduce the hoop pressure resistance performance; while hoop fiber reinforcement of PP-R pipes can improve the pipe's Pressure resistance performance, but cannot effectively reduce the linear expansion coefficient of the pipeline

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