Method for preparing high-temperature resistant zinc stearate

A technology of zinc stearate and high temperature resistance, which is applied in the field of plastic processing aids, can solve the problems of poor long-term high temperature resistance of zinc stearate, and achieve the effects of stable product quality, small fluctuations, and easy implementation

Inactive Publication Date: 2010-12-15
DONGGUAN CHNV TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although zinc stearate has excellent lubricating and mold release properties in plastics, due to the particularity of the stearate's own structure (with stearic acid chain), the long-term high temperature resistance of zinc stearate is poor; and In the field of high-end plastic processing, lubricating release agents are required to have good long-term high temperature resistance, so EBS lubricants are mostly selected

Method used

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Experimental program
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Effect test

preparation example Construction

[0016] The preparation method of a high-temperature-resistant zinc stearate provided by the present invention is to put stearic acid into a reaction kettle and heat it to 130-180°C under normal pressure, then add zinc oxide and a catalyst in two steps successively to carry out the reaction After adding antioxidant, stir and discharge, keep the temperature between 130°C and 180°C during the whole process, and then pulverize to obtain the product.

[0017] Technical requirements: 1. The purity of zinc oxide is greater than 99.7%; 2. The total amount of stearic acid, zinc oxide and antioxidant added is 1400: 210-220: 3-7 by mass; 3. The added The mass ratio of the total amount of catalyst to stearic acid is 50-85:1400.

[0018] The catalyst mentioned in the scheme can include one or more of water, ethanol, citric acid, hydrogen peroxide, acetic acid, sodium bisulfite, sodium dihydrogen phosphate, sodium bisulfate; the antioxidant is an epoxy Compound; Stearic acid comprises the ...

Embodiment 1

[0020] Put 1400kg of stearic acid into the normal pressure reactor and heat up to dissolve it. After the stearic acid is dissolved, start stirring. When the temperature rises to 130°C, put 125kg of zinc oxide into the reactor and add 30kg of water as a catalyst; react for 30 minutes Put 88kg of zinc oxide into the reaction kettle again, add 30kg of water as a catalyst, add 6kg of hydrogen peroxide after 30 minutes, add 3kg of epoxy antioxidant after 60 minutes and stir for 5 minutes before discharging. Keep the temperature not lower than 130°C and not higher than 180°C during the whole process.

Embodiment 2

[0022] Put 1400kg of stearic acid into the normal-pressure reactor and heat up to dissolve it. After the stearic acid is dissolved, start stirring. When the temperature rises to 140°C, put 125kg of zinc oxide into the reactor and add 30kg of water as a catalyst; react for 30 minutes Then put 89kg of zinc oxide into the reaction kettle, add 10kg of water, 3kg of hydrogen peroxide and 2kg of ethanol as catalysts, add 3kg of hydrogen peroxide and 2kg of acetic acid after 20 minutes, add 5kg of epoxy antioxidant after 30 minutes and stir for 15 minutes before discharging . Keep the temperature not lower than 130°C and not higher than 180°C during the whole process.

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Abstract

The invention relates to the technical field of plastic processing aids, in particular to a method for preparing high-temperature resistant zinc stearate. An obtained product is mainly taken as a lubricating mold release agent in the plastic industry for processing at the high temperature. The method comprises the following steps of: putting stearic acid into a reaction kettle under normal pressure to heat the stearic acid to 130 to 180 DEG C; adding zinc oxide and a catalyst in two steps; reacting, adding an antioxidant, stirring and discharging the reaction product, wherein temperature is kept between 130 and 180 DEG C in an entire reaction process; and smashing to obtain a zinc stearate product. The acid value of free stearic acid in the high-temperature resistant zinc stearate prepared by the method is less than 0.5 percent and the whiteness of the product is enhanced greatly after heat is preserved at the temperature of 220 DEG C for 2 hours. Moreover, the zinc stearate has the advantages of stable process control, stable product quality, small fluctuation, no pollution of the used catalyst and the antioxidant on the environment and capability of meeting the environmental protection requirements of energy conservation and emission reduction; and the process has the advantages of simpleness, easy implementation, contribution to expanding the application field of the zinc stearate and very high economic benefit and social benefit.

Description

Technical field: [0001] The invention relates to the technical field of plastic processing aids, in particular to a preparation method of zinc stearate, and the obtained product is mainly used as a lubricating release agent in the plastic industry processed at high temperature. Background technique: [0002] Zinc stearate is mainly used as a non-toxic stabilizer for polyvinyl chloride, a lubricating release agent for plastic products, a paint polishing aid, a softener and release agent for rubber in the rubber industry, a halogen absorbent, a textile waterproofing agent and cosmetics Additives and tablet release agents have a wide range of markets at home and abroad. With the development of the plastics industry, the demand for zinc stearate will continue to increase. At present, zinc stearate in the market is still a situation where two processes coexist, the direct method (dry method) and the indirect method (water method). With the introduction of more and more stringent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/126C07C51/41C08K5/098B29C33/60
Inventor 荀育军胡丹
Owner DONGGUAN CHNV TECH CO LTD
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