High-strength heat shrinkable stress pipe

Abstract

The invention discloses a high-strength heat shrinkable stress pipe which comprises 6-10 parts of maleic anhydride, 2-3 parts of butylmercaptooxo stannane, 0.3-0.6 part of 4-dimethylaminopyridine, 510-600 parts of high-density polyethylene, 3-4 parts of castor oil, 100-134 parts of N,N-dimethylformamide, 35-40 parts of calcium carbonate, 46-50 parts of n-methyl pyrrolidone, 10-14 parts of ethylenediamine, 1-2 parts of dicyclohexyl carbodiimide, 5-7 parts of diethyl phthalate, 2-3 parts of pyromellitic dianhydride and 6-8 parts of dimethylformamide. According to the high-strength heat shrinkable stress pipe disclosed by the invention, through the amidation reaction of amino in ethylenediamine with calcium carbonate, ethylenediamine is successfully grafted on calcium carbonate; through the hydrogen-bond interaction or acid anhydride reaction between the terminate amino of amidated calcium carbonate and the acid anhydride in a matrix polyethylene, the dispersity and interface interaction of calcium carbonate in the matrix are promoted; and meanwhile, the acid anhydride molecular chain of the matrix contains plenty of polar groups such as carboxyl, hydroxyl and carbonyl, and the groups can form interacting hydrogen bonds or coordinate bonds with calcium carbonate particles, thereby enhancing the bonding effect of the interface and further improving the mechanical strength and thermal stability of the finished product of base material.

Description

technical field [0001] The invention mainly relates to a pipe material, in particular to a high-strength heat-shrinkable stress pipe. Background technique [0002] Polyethylene is an inexpensive, versatile, and easy-to-form thermoplastic. However, polyethylene's mechanical properties, lack of thermal stability and non-polarity limit its application in some fields, and polyethylene can be compounded with some fillers to improve its mechanical properties and heat resistance, etc., but because of its It is easy to agglomerate and has low binding force with the polymer interface, and poor dispersion uniformity. It is necessary to increase the amount of addition to obtain a composite material with better performance; therefore, in order to improve the interfacial binding force between the filler and the polymer matrix and improve the dispersion of the filler, how to use The effective combination of filler and polyethylene has become the focus of research. Contents of the i...

AI Technical Summary

Problems solved by technology

However, polyethylene's mechanical properties, lack of thermal stability and non-polarity limit its application in some fields, and polyethylene can be compounded with some fillers to improve its mechanical properties and heat resistance, etc., but because of its It is easy to agglomerate and has low binding force with the polymer interface, and poor dispersion uniformity. It is necessary to increase the amount of addition to obtain a composite material with better performance; therefore, in order to improve the interfacial binding force between the filler and the polymer matrix and improve the dispersion of the filler, how to use The effective combination of fillers and polyethylene has become the focus of research