Preparation method of PVC pipe with high weather resistance

Abstract

A preparation method of a PVC pipe with high weather resistance comprises the following steps: (1) the PVC pipe with the high weather resistance comprises the following components: 100 parts of SG-3 type PVC, 20-30 parts of toluene isocyanate, 1-5 parts of iron oxide powder, 2-3 parts of a heat transfer agent, 3-6 parts of a heat absorbent, 2-7 parts of paraffin, 1-3 parts of a low-lead compound stabilizer and 2-6 parts of erucyl amide; weighing the components, sequentially feeding all the components into a material mixing machine, uniformly mixing at 80-100 DEG C to obtain a mixture; (2) extruding and forming the mixture by using a screw extruder; (3) cooling and shaping the pipe through a vacuum cooling sizing method after the pipe is extruded. According to the method disclosed by the invention, by improving the formula of the pipe, the inner wall and the outer wall of the pipe produced by the SG-3 type PVC raw material are smooth and smooth, and on the premise that the original mechanical strength is kept, so that the problem that the weather resistance is poor in the using process of the pipeline is solved, the production efficiency and the product percent of pass are obviouslyimproved, and the manufacturing cost of products is greatly reduced.

Description

technical field [0001] The invention relates to a pipe extrusion molding method, in particular to a preparation method of a high weather-resistant PVC pipe. Background technique [0002] The Chinese invention patent with publication date of January 14, 2015 and publication number CN 104277353 A discloses a production method for PVC pipes: using ingredients and recycled materials to co-extrude PVC pipes, the ingredients include sequentially mixing components and The mass percentage of each component is: PVC resin 48-53%, light calcium carbonate 39-44%, stabilizer 1-3%, paraffin 0.5-2%, stearic acid 1-3%, CPE 3-5% and Titanium dioxide 0.5-2%; The recycled material is obtained by the following steps: chopping, using a shredder to chop the recycled PVC waste pipe to obtain recycled materials; PVC material removal; Grinding, using a grinder to grind the screened PVC material to obtain granular recycled material with a diameter of 2.7-3.3mm. The production method of PVC pipe mat...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing high weather-resistant PVC pipes. Through the improvement of the pipe formula, the inner and outer walls of the pipes produced by using SG-3 PVC raw materials are very smooth, and the original mechanical strength is maintained. It not only solves the problem of poor weather resistance in the process of pipeline use, but also significantly improves production efficiency and product qualification rate, and greatly reduces the manufacturing cost of products