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Process for preparing still release agent

The technology of anti-sticking agent and alkaline environment is applied in the field of preparation of anti-sticking agent, which can solve problems such as poor transparency, and achieve the effects of simple production process, low production cost and strong anti-sticking ability.

Inactive Publication Date: 2005-05-18
JIANGSU JIAHUA ADVANCED MATERIALS TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Such as a preparation process of the "1-naphthol-formaldehyde-alkali" system of the British Imperial Chemical Company, the obtained liquid is blue or dark blue, the transparency is not good, and it is easy to color the polyvinyl chloride resin in the production process

Method used

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Examples

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Embodiment Construction

[0016] A preparation method of an anti-sticking pot agent, using thiourea dioxide as a reduction decolorizing agent, obtained by polycondensation of 1-naphthol and formaldehyde in an alkaline environment, the alkaline environment is an aqueous NaOH solution with a pH value of 11 to 13, and the reaction temperature is 65~95℃.

[0017] With process flow:

[0018] (a) Add 10-20 parts of 1-naphthol, 40-150 parts of water and 3-10 parts of 32% NaOH aqueous solution into the reactor, and heat the mixed solution to 70° C. under effective stirring.

[0019] (b) Divide 75~200g concentration of 4%w / w thiourea dioxide solution into two parts, mix 30~40% of total thiourea dioxide and 3~10 parts of 37% formaldehyde solution in 0.5~3 hours Add it dropwise into the reactor to ensure that the reactor is an alkaline environment and the temperature does not exceed 85°C.

[0020] (c) Heating the reaction solution to 87-93° C. with stirring, keeping the temperature of the reactor not higher tha...

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Abstract

The present invention relates to the preparation of chemical product, and especially the preparation process of chemical assistant for polyvinyl chloride resin production. The still release agent is prepared with thiourea dioxide as reducing decolorant and through the condensation of 1-naphthol and formaldehyde under alkali environment. The preparation process is simple and low in cost, and the prepared still release agent has high still releasing capacity and no coloring.

Description

Technical field [0001] The invention relates to a preparation process of a chemical product, in particular to a preparation method of an anti-adhesive potting agent used in the production of polyvinyl chloride resin. Background technique [0002] At present, in the production of chemical products polyvinyl chloride resin, polymerization aids are generally added in the polymerization process. During the polymerization process, the inner wall of the polymerization kettle, the baffle plate, the top of the kettle, the stirring paddle and the condenser are prone to produce sticky matter, which will contaminate the resin, resulting in the increase of black and yellow spots and fish eyes, and the accumulation of The sticky matter in the kettle will also affect the heat transfer of the polymerization kettle, increase the risk of the production process, prolong the production cycle, and lead to a decrease in output. In order to maintain normal production, the accumulated sticky matt...

Claims

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Application Information

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IPC IPC(8): C08F2/44C08G8/08
Inventor 薛华郭朝彬
Owner JIANGSU JIAHUA ADVANCED MATERIALS TECH
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