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Intercalated hydrotalcite containing double bond organic anion and its uses as heat stabilizer

An organic anion and hydrotalcite technology, which is applied in the treatment of hydrotalcite and dyed low-molecular organic compounds, can solve the problems of not giving full play to the chemical composition of hydrotalcite laminates and the controllability of anion species between layers.

Inactive Publication Date: 2006-05-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, hydrotalcites used in PVC heat stabilizers are limited to interlayer CO 3 2- The types of hydrotalcite laminates do not give full play to the adjustable characteristics of the chemical composition of hydrotalcite laminates and the types of interlayer anions.

Method used

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  • Intercalated hydrotalcite containing double bond organic anion and its uses as heat stabilizer
  • Intercalated hydrotalcite containing double bond organic anion and its uses as heat stabilizer
  • Intercalated hydrotalcite containing double bond organic anion and its uses as heat stabilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Step A. 10.26g Mg(NO 3 ) 2 ·6H 2 O and 7.50g Al(NO 3 ) 3 9H 2 O dissolves in deCO 2 50ml of mixed salt solution was prepared in deionized water, and 4.8g of NaOH was dissolved in deCO 2 50ml of alkaline solution was prepared in deionized water. Add the two solutions into the reactor simultaneously and react for 3min. 2 Reflux and crystallize at 100°C for 6 hours under protection, filter, and deCO 2 Washed with deionized water to obtain 4.87g Mg:Al=2:1 hydrotalcite precursor filter cake MgAl-NO 3 -LDHs.

[0030] Step B. Disperse the above-mentioned hydrotalcite precursor filter cake in 20ml ethylene glycol, dissolve 2.32g maleic acid in 2.0ml ethylene glycol, control the pH>4.0, add the ethylene glycol solution of maleic acid dropwise The hydrotalcite precursor is heated to the reflux temperature in the ethylene glycol dispersion liquid, reacted for 6 hours, washed and dried to obtain the maleic acid intercalated hydrotalcite. Determined by elemental analysis,...

Embodiment 2

[0033] Step A. 8.20g Mg(NO 3 ) 2 ·6H 2 O, 3.17g Zn(NO 3 ) 2 ·6H 2 O and 8.00gAl(NO 3 ) 3 9H 2 O dissolves in deCO 2 80ml of mixed salt solution was prepared in deionized water, and 1.60g of NaOH was dissolved in deCO 2 80ml of alkaline solution was prepared in deionized water. Add the two solutions into the reactor simultaneously and react for 3min. 2 Crystallized at 80°C for 6 hours under protection, filtered, and deCO 2 Washed with deionized water to obtain 5.63g Mg:Zn:Al=3:2:1 precursor filter cake MgZnAl-NO 3 -LDHs.

[0034] Step B. Combine the above MgZnAl-NO 3 -The LDHs precursor filter cake is dispersed in 10ml of ethylene glycol, 4.96g of maleic acid is dissolved in 10ml of ethylene glycol to control the pH>4.0, and the ethylene glycol solution of maleic acid is added dropwise to the hydrotalcite precursor In the ethylene glycol dispersion, heated to reflux, reacted for 1 hour, washed and dried to obtain maleic acid intercalated hydrotalcite, determined b...

Embodiment 3

[0038] Step A. 7.68g Mg(NO 3 ) 2 ·6H 2 O, 8.92g Zn(NO 3 ) 2 ·6H 2 O and 11.25gAl(NO 3 ) 3 9H 2 O dissolves in deCO 2 40ml of mixed salt solution was prepared in deionized water, and 5.28g of NaOH was dissolved in deCO2 2 40ml of alkaline solution was prepared in deionized water. Add the two solutions into the reactor simultaneously and react for 3min. 2 Reflux crystallization at 100°C for 6 hours under protection. The obtained product was deCO 2 Washed with deionized water and filtered to obtain 8.54g MgZnAl-NO of Mg: Zn: Al=1:1:1 3 - LDHs precursor filter cake.

[0039] Step B. Combine the above MgZnAl-NO 3 - The LDHs precursor filter cake is dispersed in 13ml of ethylene glycol, 5.22g of maleic acid is dissolved in 9ml of ethylene glycol, and the pH is controlled to be > 4.0, and the ethylene glycol solution of maleic acid is added dropwise to the ethylene glycol of the hydrotalcite precursor In the diol dispersion liquid, heated to reflux, reacted for 4 hours...

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Abstract

The invention provides the organic anion intercalation hydrotalcite containing double bond, whose chemical formula is [M2+1-xM3+x(OH)2]An-x / níñmH2O. An is organic anion intercalation hydrotalcite containing double bond, such as maleic acid group, acroleic acid group, butenoic acid group, and so on. Because the double bond of organic anion intercalation hydrotalcite can react with the conjugate double bonds produced by PVC, the long-term thermal stability of PVC is improved markedly. The hydrotalcite can effectively improve the effectively of PVC.

Description

Technical field: [0001] The invention relates to a novel supramolecular intercalation hydrotalcite, in particular to an organic anion intercalation hydrotalcite containing double bonds; and the hydrotalcite is used as a composite heat stabilizer for PVC. Background technique: [0002] Under the influence of high temperature or high-energy rays (such as ultraviolet rays), PVC and other chlorine-containing high polymers will undergo autocatalytic reactions to remove HCl. It is generally believed that there are three thermal decomposition mechanisms: (1) free reaction in an oxygen-containing environment. (2) ion mechanism under nitrogen atmosphere; (3) unimolecular mechanism under vacuum condition. The thermal degradation of PVC is a very complicated process. The direct consequence of degradation is that the color becomes darker, and the structure and performance of the product are greatly damaged. Heat stabilizer is one of the indispensable main additives in the processing of...

Claims

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Application Information

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IPC IPC(8): C09C3/08C08K9/04C08L27/06
CPCC01P2002/22C01P2002/72C01P2002/82C01P2002/88C01F7/785
Inventor 段雪李殿卿林彦军王建荣
Owner BEIJING UNIV OF CHEM TECH
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