Special material for silicane grafted PPR (polypropylene random) pipe and preparation method thereof

Abstract

The invention discloses a special material for a silicane grafted PPR (polypropylene random) pipe. The special material for the silicane grafted PPR pipe is formed by a material A and a material B in ratio in parts by weight of 90:10-95:5, wherein the material A comprises 80-95 parts of PPR, 5-20 parts of high-density polyethylene, 1-3 parts of unsaturated silicane, 0.01-0.03 part of initiator, 0.1-0.5 part of antioxidant and 0.1-2 parts of auxiliary crosslinking agent; and the material B comprises 100 parts of PPR, 1-3 parts of catalyst, 0.1-0.5 part of antioxidant and 1-5 parts of auxiliary catalyst. The preparation method comprises that the material A and the material B are respectively independently extruded and pelletized, then the material A and the material B are mixed to be uniform in proportion, and a pipe can be directly extruded. The special material disclosed by the invention is good in impact strength and creep resistance and can be widely applied to various pipeline products such as a hot and cold water pipe; and the preparation method is simple, and a long-time high temperature poaching process is not required, so that the preparation method disclosed by the invention is convenient for industrial production.

Description

technical field [0001] The invention belongs to the field of PPR pipes, and in particular relates to a special material for silane-grafted PPR pipes and a preparation method thereof. Background technique [0002] PPR pipe products are made of random copolymer polypropylene. It is another new type of thermoplastic pipe after cross-linked polyethylene and polybutene pipes. The pipe produced by PPR has the advantages of light weight, good heat resistance, low thermal conductivity, small elastic modulus, small pipe resistance, sanitation, corrosion resistance, long service life, convenient installation, reliable connection and recyclable materials, etc. Features, can be widely used in various hot and cold water pipes. However, the existing PPR pipes also have some deficiencies, mainly: the rigidity and impact resistance are worse than metal pipes, the coefficient of linear expansion is large, the construction is easy to break, and the creep property is relatively large. Espec...

AI Technical Summary

Problems solved by technology

However, the inventors found that although PE and PP have the same mechanism of silane grafting reaction under the action of initiator, the chemical reactions of PPR and PE are different, and PPR is prone to degradation under the action of initiator, while PE No degradation will occur, and the degradation of PPR will have an adverse effect on the mechanical properties of the pipe, so the technology suggested by this patent cannot be directly used to improve the performance of PPR

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