Manufacturing process of PVC (Poly Vinyl Chloride) external lubricant

Abstract

The invention aims to solve the problems in the prior art, provide a PVC (Poly Vinyl Chloride) external lubricant and a manufacturing process thereof, reduce the reaction temperature in the machining process and optimize the proportioning of a product. For fulfilling the aims, the manufacturing process comprises the following steps of: firstly, carrying out recovery processing on waste liquor generated in the chemical industry to obtain fumaric acid; in the machining process, firstly, using the fumaric acid as mother liquor according to a certain ratio, then adding polyatomic alcohol according to the ratio, adding pentaerythritol proportioned according to the ratio after sufficiently stirring, and finally, adding stearic acid to carry out esterification; then carrying out polymerization at a high temperature of 150 DEG C to 160 DEG C; after polymerization, carrying out vacuum dealcoholization at a high temperature of 200 DEG C; and slicing after cooling, wherein in the whole machining process, no catalyst is added. The manufacturing process has the beneficial effects of low reaction temperature, good polymerization effect and high finished product conversion rate due to the adoption of the technical scheme.

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 requirements of adipic acid are high and the price is expensive, which makes the cost of the entire external lubricant higher;

[0008] 2. The non-stickiness of adipic acid is poor and the precipitation is large. 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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