Multi-layer composite pipe material and preparation method thereof

Abstract

The invention discloses a multi-layer composite pipe material and a preparation method thereof. The pipe material is divided into an inner layer, a middle layer and an outer layer, the inner layer ismade from fluoroolefin polymer, the middle layer is made from macromolecule alloy containing a comb-shaped compatilizer, and the outer layer is made from atactic polyolefin. The pipe material adopts athree-layer co-extrusion one-time forming technology and has the advantages that the precipitation is low, the combination among layers is compact, and the production technology is convenient; the pure polyvinylidene fluoride pipe material is environmentally friendly, the precipitating performance is low, and the chemical stability is good; the anti-impacting strength is high, the anti-abrasion and anti-creep effects are achieved, and the mechanical strength and toughness are good; the heat resistance performance is good, the long-term using temperature is -20-100 DEG C, the surface of the material is smooth, the fluid resistance is low, and the oxygen resistance performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of pipes, and in particular relates to a multilayer composite pipe and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride is a material with excellent performance, which is environmentally friendly, has little precipitation and good chemical stability; high impact strength, wear resistance, creep resistance, good mechanical strength and toughness; good heat resistance and non-combustibility , Long-term use temperature -40-150 ℃; excellent quality such as smooth surface, small fluid resistance, and outstanding oxygen barrier performance, especially suitable for pure water transportation and other fields, but the high price of polyvinylidene fluoride makes it difficult for this material to enter the civilian field. Therefore, it has not been widely used in the pipe field. In order to expand the application range of polyvinylidene fluoride in the field of high-purity water tran...

AI Technical Summary

Problems solved by technology

[0007] 1. The inner layer must use modified or composite polyvinylidene fluoride material, which is easy to precipitate small molecules and difficult to pass the hygienic performance test;

[0008] 2. The cohesive force of the inner and outer layer materials is not strong, and the inner and outer layers are easy to detach, so it is difficult to pass the hydrostatic test of cold water internal pressure, hot water internal pressure and thermal cycle to verify the strength and life of the pipe;

[0009] 3. One-time co-extrusion molding cannot be achieved, and the production process is complicated

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