Manufacturing process of PVC (Poly Vinyl Chloride) external lubricant

A production process and external lubricant technology, applied in the field of plastics, can solve the problems of high labor intensity, high processing temperature, low production efficiency, etc., and achieve the effects of improving product quality, reducing reaction temperature and saving production costs.

Active Publication Date: 2012-07-25
夏瑭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Fumaric acid is acid reflux obtained by recycling waste liquid produced by other chemical industries. The standard chemical name of fumaric acid is: fumaric acid; molecular formula is: C 4 h 4 o 4 ; It is a white crystalline powder with a fruity sour taste.

[0048] The process of recovering and processing fumaric acid in the process of ortho-method phthalic anhydride is as follows: the oxidized tail gas of ortho-method phthalic anhydride contains 25% wt of citric acid after being washed with water, and is directly pumped to the fumaric acid production unit. Under the action of a catalyst, the cis acid in the waste liquid is isomerized, the catalyst is selected from thiourea, the acid reflux is recovered, and fumaric acid (fumaric acid) is obtained by crystallization. Because the acid water is brown, the crude fumaric acid after cooling and crystallization is brown, decolorized with activated carbon, rinsed and dried to obtain refined fumaric acid.

[0049] During p...

Embodiment 2

[0057] The mass percent of each component is:

[0058] Stearic acid: 40%

[0059] Pentaerythritol: 30%

[0060] Fumaric Acid: 15%

[0061] Ethylene glycol 15%

[0062]Composition, in which fumaric acid is extracted from gutter oil after filtering. During processing, fumaric acid is selected as the mother liquor in proportion, and then ethylene glycol is added in proportion. Stearic acid is added for esterification, followed by high-temperature polymerization at 150°C. After polymerization, dealcoholization is carried out under high-temperature vacuum at 200°C, and sliced ​​after cooling. No catalyst is added during the entire process. The conversion of this reaction is around 94%.

[0063] The appearance of the obtained PVC external lubricant and its manufacturing process is white or light yellow flake or flake powder, with a freezing point of ≥ 56°C, a flash point of ≥ 240°C, and a viscosity of ≤ 90mpa·S at 80°C. When adding PVC raw materials, the general dosage is 0.3%-...

Embodiment 3

[0065] The mass percent of each component is:

[0066] Stearic acid: 40%

[0067] Pentaerythritol: 20%

[0068] Fumaric Acid: 23%

[0069] Dipropylene Glycol 17%

[0070] Composition, in which fumaric acid is extracted from gutter oil after filtering, first select fumaric acid as the mother liquor in proportion during processing, then first add dipropylene glycol in proportion, after fully stirring, add pentaerythritol according to the above proportion, and finally add Stearic acid is esterified, then polymerized at a high temperature of 150°C, dealcoholized in a vacuum at a high temperature of 200°C after polymerization, sliced ​​after cooling, and no catalyst is added during the whole process. The conversion of this reaction is around 95%.

[0071] The appearance of the obtained PVC external lubricant and its manufacturing process is white or light yellow flake or flake powder, with a freezing point of ≥ 56°C, a flash point of ≥ 240°C, and a viscosity of ≤ 90mpa·S at 80°...

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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 machiningprocess, 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/676C08G63/78C08L27/06C08L67/06
Inventor 夏森林徐璐莎夏国斌
Owner 夏瑭
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