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Method for preparing processinga id for rare earths of a sort of polyvinyl chloride

A processing aid, polyvinyl chloride technology, applied in the field of preparation of rare earth stabilizers, can solve problems affecting long-term product stability, migration and precipitation of rare earth stabilizers, low molecular weight, etc., to improve coupling effect and anti-aging Time to improve and solve the effect of precipitation problems

Inactive Publication Date: 2006-04-19
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the organic components of rare earth stabilizers are generally organic acids with small molecular weight, such as stearic acid, etc., which may easily cause the migration and precipitation of rare earth stabilizers, thus affecting the long-term stability of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of a rare earth processing aid for polyvinyl chloride, comprising the following processing steps:

[0018] First, castor oil and maleic anhydride are esterified in a molar ratio of 1:1.

[0019] The specific esterification process is to add 1: 1 molar ratio castor oil and maleic anhydride in a flask, the reaction temperature is 80-90 degrees, nitrogen protection, under the mechanical stirring condition of 250-400 rev / min of rotating speed, Reacted for 8 hours to obtain bright viscous liquid, i.e. esterified product, which is castor oil esterified with maleic anhydride.

[0020] Dissolve the rare earth lanthanum oxide with dilute hydrochloric acid with a concentration of 20-25%, and then add the esterified product prepared above, that is, castor oil esterified with maleic anhydride, under the condition of high-speed stirring at a speed of 500-800 rpm, and react at room temperature , wherein the ratio of rare earth lanthanum oxide and castor oil este...

Embodiment 2

[0024] A preparation method of a rare earth processing aid for polyvinyl chloride, comprising the following processing steps:

[0025] First, castor oil and maleic anhydride are esterified in a molar ratio of 1:2. Esterification conditions are the same as in Example 1.

[0026] Subsequent process is with embodiment 1.

Embodiment 3

[0028] A preparation method of a rare earth processing aid for polyvinyl chloride, comprising the following processing steps:

[0029] First, castor oil and maleic anhydride are esterified in a molar ratio of 1:2. Esterification conditions are the same as in Example 1.

[0030] Dissolve the rare earth lanthanum oxide with dilute hydrochloric acid with a concentration of 20-25%, and then add the esterified product prepared above, that is, castor oil esterified with maleic anhydride, under the condition of high-speed stirring at a speed of 500-800 rpm, and react at room temperature , wherein the ratio of rare earth lanthanum oxide and maleic anhydride esterified castor oil is 2:1 by mole during the reaction.

[0031] The above reaction product is washed with water and dried to obtain the rare earth processing aid.

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PUM

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Abstract

A process for preparing the stabilizer of PVC includes such steps as esterifying reaction between castor oil and maleic anhydride, dissolving lanthanum oxide in diluted hydrochloric acid, and dripping said esterified substance into said solution. It can improve the machinability and strength of PVC product.

Description

technical field [0001] The invention relates to a preparation method of a rare earth stabilizer. Background technique [0002] Our country is one of the countries with the richest rare earth resources. Rare earth materials are generally stabilizers of polyvinyl chloride as polymer processing aids. Rare earth additives have incomparably superior performance as the processing stability of polyvinyl chloride, such as reducing the use of lead stabilizers, which is conducive to the environmental protection of products, making polyvinyl chloride processing easier, and has long-term thermal stability. The filler has a unique coupling effect, etc., which reduces processing costs. [0003] But at present, the organic components of rare earth stabilizers are generally organic acids with small molecular weight, such as stearic acid, etc., which may easily cause the migration and precipitation of rare earth stabilizers, thereby affecting the long-term stability of the product. Migrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L91/00C08L27/06C08K5/09C08K3/08
Inventor 王峰
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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