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PVC external lubricant

An external lubricant, fumaric acid technology, applied in lubricating compositions, petroleum industry, base materials, etc., can solve the problem of PVC product strength, cold resistance and other comprehensive properties without any improvement, affecting product economic benefits, polyvinyl chloride stability Poor performance, good free flow performance, good demoulding effect and good lubrication performance

Inactive Publication Date: 2008-12-24
夏森林
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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 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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 1 h 1 o 1 ; It is a white crystalline powder with a fruity sour taste.

[0038] 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.

[0039] The mass...

Embodiment 2

[0042] The mass percentage of each component is: stearic acid: 70%; pentaerythritol: 27%; fumaric acid: 3%. After mixing according to the above proportions, mix and dissolve according to the above proportions, then esterify and carry out high-temperature polymerization above 195°C, and slice into PVC external lubricants after cooling. The conversion of this reaction is around 92%.

[0043] The appearance of the obtained PVC external lubricant is white or light yellow flakes, the freezing point is ≥56°C, the flash point is ≥240°C, and the viscosity at 80°C is ≤90mpa·S. When adding PVC raw materials, the general dosage is 0.3%-0.8% of the total amount.

Embodiment 3

[0045] The mass percentage of each component is: stearic acid: 40%; pentaerythritol: 20%; fumaric acid: 40%. After mixing according to the above proportions, mix and dissolve according to the above proportions, then esterify and carry out high-temperature polymerization above 195°C, and slice into PVC external lubricants after cooling. The conversion of this reaction is around 92%.

[0046] The appearance of the obtained PVC external lubricant is white or light yellow flakes, the freezing point is ≥56°C, the flash point is ≥240°C, and the viscosity at 80°C is ≤90mpa·S. When adding PVC raw materials, the general dosage is 0.3%-0.8% of the total amount.

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Abstract

The present invention discloses a PVC outer lubricant, which includes the following ingredients with the following mass percentages: 40 percent to 70 percent of stearic acid; 10 percent to 30 percent of pentaerythritol ester; 5 percent to 40 percent of fumaric acid. The PVC outer lubricant adopts the fumaric acid to replace the original hexanedioic acid, and the fumaric acid is the regurgitated acid obtained by recovering and processing waste liquid produced by other chemical industries. The recycling of the waste liquid not only can pretect environment but also can reduce cost. With the advantages of nontoxic fumaric acid, good lubricating property, good free flowing property, good inadhesion and little precipitation, the PVC outer lubricant greatly decreases the frequency of halting a machine to insert rollers in the process of production, thus reducing the labor intensity of operators, increasing production efficiency and ensuring good demoulding effect, and therefore the economic benefit of products is increased. The PVC outer lubricant can improve the strength and the cold-resisting property of PVC products to a certain degree. The PVC outer lubricant is widely applicable to PVC sheets, transparent sheets, color sheets, ground sheets, films, pelleting and sectional material processing, etc.

Description

【Technical field】 [0001] The invention relates to the field of plastics, in particular to 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 products, etc. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/60C10M105/08
Inventor 夏森林
Owner 夏森林
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