Aluminum zinc rare-earth hydrotalcite thermal stabilizer for PVC and application thereof

A composite thermal stabilizer and hydrotalcite technology, applied in the field of material application, can solve the problems of weakened sample transparency, poor coloring effect, poor thermal stability, etc. Effect

Inactive Publication Date: 2011-01-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ternary rare earth hydrotalcites reported in the literature are basically used in catalysts and fluorescent materials. Although there is a patent 200910303613.1 that adds Mg-Al rare earth hydrotalcites to PVC as a heat stabilizer, the Mg-Al hydrotalcites In the early stage, the thermal stability is poor and the coloring effect is poor. Because of the

Method used

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  • Aluminum zinc rare-earth hydrotalcite thermal stabilizer for PVC and application thereof
  • Aluminum zinc rare-earth hydrotalcite thermal stabilizer for PVC and application thereof
  • Aluminum zinc rare-earth hydrotalcite thermal stabilizer for PVC and application thereof

Examples

Experimental program
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Effect test

Example Embodiment

Example 1:

Zinc-aluminum-cerium hydrotalcite (molar ratio: M 2+ / M 3+ =2:1, Ce 3+ / M 3+ =0.2) preparation and modification. Weigh 12.82g Mg(NO 3 ) 2 ·6H 2 O (0.050moL), 7.50g Al (NO 3 ) 3 9H 2 O(0.02moL), 2.171gCe(NO 3 ) 3 ·6H 2 O (0.005moL), 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 at about 8, stir the reaction at 85°C, add dropwise Continue to stir for 2 hours after completion, 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 75%). Add water in wet filter cake, water / wet filter cake mass ratio is 50: 1, be warming up to 80 ℃, add the modifier (modifier is sodium stearate) that accounts for 2% of wet filter cake quality, stir After 2 hours, filter and dry at 80° C....

Example Embodiment

Example 2:

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

Example Embodiment

Example 3:

According to the method of embodiment 1, the molar ratio obtained is M 2+ / M 3+ =2:1, La 3+ / M 3+ = 0.1 zinc aluminum lanthanum hydrotalcite.

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Abstract

The invention relates to an aluminum zinc rare-earth hydrotalcite compound thermal stabilizer for PVC and application thereof. The compound thermal stabilizer is compounded from aluminum zinc rare-earth hydrotalcite and proper amounts of calcium soap and beta-diketone in optimal proportions. A sodium stearate wet process is used for modifying the aluminum zinc rare-earth hydrotalcite and enhances the compatibility thereof with the PVC; the invention firstly adds the compounded modified aluminum zinc rare-earth hydrotalcite, the calcium soap and the beta-diketone into the PVC to serve as the compound thermal stabilizer. The static thermal ageing test indicates that the thermal stabilization time (the turning-black time of a sample) of the optimally compounded thermal stabilizer reaches more than 240 minutes. The thermal stabilizer can enhance the product transparence, has the advantages of favorable stability, simple and practicable preparation process, no toxicity, high efficiency and favorable weatherability, and effectively prevents zinc erosion.

Description

technical field The invention relates to a zinc-aluminum rare earth hydrotalcite composite heat stabilizer for polyvinyl chloride and its application, belonging to the field of material application. Background technique Under the influence of high temperature and high heat, polyvinyl chloride (PVC) will undergo a catalytic degradation reaction to remove HCl, which will affect its performance and bring difficulties to processing. Therefore, a certain heat stabilizer must be added before use to alleviate its degradation within a certain period of time. There are many kinds of heat stabilizers, but most of them are toxic or expensive, so it is of great significance to develop a cheap, non-toxic and efficient heat stabilizer. Hydrotalcite heat stabilizer is a kind of non-toxic inorganic auxiliary stabilizer developed by Kyowa Chemical Company in Japan in the 1980s. Because of its unique structure and performance, it has been highly valued by researchers at home and abroad, an...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08K13/06C08K3/26C08K5/07C08K5/098C08K5/12
Inventor 杨占红陈红燕温润娟易师
Owner CENT SOUTH UNIV
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