PVC compound heat stabilizer prepared from magnesium/aluminum rare-earth hydrotalcite and application thereof

A technology of compound heat stabilizer and hydrotalcite, applied in the field of material application technology development, can solve the problems of toxicity, poor coloring, expensive and the like

Inactive Publication Date: 2009-11-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome some common disadvantages of traditional thermal stabilizers such as toxicity, expensive, poor coloring, short thermal stability time, etc.

Method used

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  • PVC compound heat stabilizer prepared from magnesium/aluminum rare-earth hydrotalcite and application thereof
  • PVC compound heat stabilizer prepared from magnesium/aluminum rare-earth hydrotalcite and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Magnesium aluminum cerium hydrotalcite (molar ratio: M 2+ / M 3+ =2:1, Ce 3+ / M 3+ =0.025) preparation and modification

[0050] Weigh 12.32gMgSO 4 ·7H 2 O (0.050moL), 8.12gAl 2 (SO 4 ) 3 18H 2 O(0.012moL), 0.271gCe(NO 3 ) 3 ·6H 2 O (0.000625moL), add 40mL deionized water after mixing; weigh 1.325gNa 2 CO 3 (0.013moL) and 6.0gNaOH (0.150moL), after mixing, add 40mL of deionized water; add the above two solutions dropwise to 30mL of deionized water, keep the pH value between 11 and 12, and stir the reaction at 85°C After the dropwise addition, continue to stir for 2 hours, then age at 65° C. for 20 hours, filter, and wash to pH=7 to obtain a magnesium aluminum hydrotalcite filter cake (the moisture content of the wet filter cake is about 82%). Add water in the wet filter cake, water / wet filter cake mass ratio is 50: 1, heat up to 80 ℃, add the modifying agent that accounts for 2% of wet filter cake mass (the modifying agent dissolves titanate in ethylene gly...

Embodiment 2

[0052] According to the method of embodiment 1, the molar ratio obtained is M 2+ / M 3+ =2:1, Ce 3+ / M 3+ =0.075 magnesium aluminum cerium hydrotalcite.

Embodiment 3

[0054] According to the method of embodiment 1, the molar ratio obtained is M 2+ / M 3+ = 3:1, Ce 3+ / M 3+ =0.025 magnesium aluminum cerium hydrotalcite.

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Abstract

The invention relates to a PVC compound heat stabilizer prepared from magnesium/aluminum rare-earth hydrotalcite and application thereof. The compound heat stabilizer is obtained through the optimal combination between the magnesium/aluminum rare-earth hydrotalcite and calcium soap and zinc soap in a certain amount in a certain ratio, wherein, the compatibility between the magnesium/aluminum rare-earth hydrotalcite and the PVC is improved by the titanate wet modification on the magnesium/aluminum rare-earth hydrotalcite; since the rare-earth elements in the magnesium/aluminum rare-earth hydrotalcite have various track structures, the magnesium/aluminum rare-earth hydrotalcite can be coordinated with the active chlorine on the PVC, and the dehydrochlorination reaction is effectively prevented; in addition, the magnesium/aluminum rare-earth hydrotalcite can absorb and neutralize hydrochloric acid (HCl), thereby eliminating the catalytic reaction against the degradation. The invention overcomes the disadvantages of toxicity, high cost, poor pigmentation, shorter heat stabilizing time, complicated preparation process and the like in the conventional heat stabilizer and adds the heat stabilizer prepared through the combination between the modified magnesium/aluminum rare-earth hydrotalcite and the calcium/zinc heat stabilizer to PVC for the first time; and according to the results of static heat-ageing tests, the heat stabilizing time of the compound heat stabilizer obtained through the optimal combination is over 200min.

Description

technical field [0001] The invention belongs to the field of material application technology development. The invention relates to a magnesium-aluminum rare-earth hydrotalcite composite heat stabilizer for PVC and an application thereof. Background technique [0002] Due to its low price, corrosion resistance, high dielectric properties and many other advantages, PVC resin occupies an important position in high molecular polymer materials. However, the thermal stability of PVC is very poor, and the general processing temperature is higher than the decomposition temperature, so a heat stabilizer must be added during the processing. Most of the heat stabilizers widely used in industry are metal salts such as lead, cadmium, barium, tin, etc. They have certain toxicity and are harmful to human health. With the increasing awareness of environmental protection around the world, the regulations related to environmental protection are becoming increasingly strict. Under this situa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K13/06C08K9/04C08K5/098C08L27/06
Inventor 杨占红易师刘庆艳迟伟伟王素琴王升威刘东任
Owner CENT SOUTH UNIV
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