Production technology of PVC external lubricant

Abstract

The invention aims at solving problems in prior arts, and provides a PVC external lubricant and a production method thereof. According to the invention, a reaction temperature in a processing process is reduced, and a product proportion is optimized. For reaching the purpose, the method comprises steps that: waste liquid produced from chemical industries is recovered and treated, such that fumaric acid is obtained; during processing, fumaric acid is selected as mother liquor according to a certain proportion; polyhydric alcohol is added according to a certain proportion, and the mixture is sufficiently stirred; pentaerythritol with a certain proportion is added; stearic acid is added for esterification; high temperature polymerization is carried out at a temperature of 150 DEG C to 160 DEG C; the polymerized material is delivered through a vacuum dealcoholizing process at a temperature of 200 DEG C; the obtained material is cooled and sliced. No catalyst is added during the whole processing process. The invention is advantaged in that: with the technical scheme, the reaction temperature is low, the polymerization effect is good, and a finished product conversion rate is high.

Description

【Technical field】 [0001] The invention relates to the field of plastics, in particular to a production process of a PVC external lubricant for PVC engineering additives. 【Background technique】 [0002] PVC (polyvinyl chloride) is a chlorinated polymer of PE (polyethylene). It is one of the most widely used plastics and is still used in large quantities. Its consumption is second only to polyethylene and polypropylene. There are many forms of PVC products, which can be divided into three categories: hard PVC, soft PVC, and PVC paste. Rigid polyvinyl chloride is mainly used in extruded products such as pipes, door and window profiles, sheets, etc., as well as injection molded parts such as pipe joints and electrical parts, and extrusion blown bottle products, which account for more than 65% of the consumption of polyvinyl chloride. Soft polyvinyl chloride is mainly used in calendered sheets, automotive interior accessories, handbags, films, labels, wires and cables, medical p...

AI Technical Summary

Problems solved by technology

[0003] Because of the inherent molecular structure and polymerization method of polyvinyl chloride, if it is directly used as the only raw material to produce plastic products, its chemical and physical properties have great defects: for example: polyvinyl chloride has poor stability to light and heat

[0007] 1. The purity requirement of adipic acid is high and the price is expensive, which makes the cost of the entire external lubricant higher;

[0008] 2. Adipic acid has poor non-stickiness and large precipitation. During the production process, the operator often needs to stop the machine to insert the roller, which is not only labor-intensive, but also greatly reduces the production efficiency. At the same time, the demoulding effect is poor, which seriously affects the economic benefits of the product;

[0009] 3. Except for a certain lubricating effect, there is no improvement in the comprehensive performance of PVC products such as strength and cold resistance

However, the applicant's previous application documents did not provide any further explanations about the entire technological process

[0011] Afterwards, the application also studied the U.S. invention patent with the publication number US5232967A. The applicant found that this patent was an older patent application, so there were still problems of high cost and low efficiency in terms of process and material selection.

Its specific performance is that the processing temperature adopted is relatively high, and at the same time, those skilled in the art can find through experiments that the final yield and quality of finished products are not as prominent as they claim, and such a technology cannot adapt to modern production

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