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Composite heat stabilizer for PVC, preparation and application thereof

A composite heat stabilizer and preparation process technology, applied in the field of material science application technology development, can solve problems such as poor coloring, difficult control of zinc-magnesium-aluminum hydrotalcite preparation conditions, etc. capacitive effect

Inactive Publication Date: 2009-07-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of this invention is to provide a high-efficiency, non-toxic, low-cost, and simple-to-manage magnesium-aluminum hydrotalcite around the development of alternative cadmium-containing, lead-containing, and halogen-containing plastic additives, guided by major national strategies and market demands. The compound heat stabilizer with zinc-aluminum hydrotalcite not only solves the poor initial coloring of single magnesium-aluminum hydrotalcite, but also solves the shortcomings of zinc-burning of zinc-aluminum hydrotalcite, and overcomes the difficult control of the preparation conditions of zinc-magnesium-aluminum hydrotalcite Shortcomings

Method used

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  • Composite heat stabilizer for PVC, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation and modification of magnesium aluminum hydrotalcite with magnesium aluminum molar ratio of 2.0

[0037] Weigh 12.82gMg(NO 3 ) 2 ·6H 2 O(0.05moL) and 8.44gAl(NO 3 ) 3 9H 2 O (0.025moL), add deionized water after mixing to make Mg 2+ The concentration is 1.2mol / L; weigh 1.325gNa 2 CO 3 (0.0125moL) and 6.0gNaOH (0.15moL), after mixing, add deionized water to make CO 3 2- / OH - =0.08; add the above two solutions dropwise into 30mL deionized water, keep the pH value between 9 and 10, stir and react at 85°C, continue to stir for 2 hours after the dropwise addition, and then age at 65°C After 20 hours, filter and wash until pH = 7 to obtain a magnesium aluminum hydrotalcite filter cake.

[0038] Add water about 15 times the solid weight of the filter cake to the magnesium aluminum hydrotalcite filter cake, heat up to 80°C, add stearic acid accounting for 5% of the solid mass of the filter cake, stir for 2 hours, filter, and dry at 80°C , to o...

Embodiment 2

[0039] Example 2: According to the method of Example 1, magnesium aluminum hydrotalcite with a magnesium aluminum molar ratio of 3.0 was prepared.

Embodiment 3

[0040] Example 3: Preparation and modification of zinc-aluminum hydrotalcite with a zinc-aluminum molar ratio of 1.0

[0041] Mix 4.069g of zinc oxide with 4.099g of sodium aluminate aqueous solution, add 4.000g of NaOH and 2.650g of NaOH 2 CO 3 , the pH value was controlled at 11-12, reacted at 90°C for 3 hours with stirring, then reacted in an autoclave at 110°C for 12 hours, and aged at 80°C for 12 hours. Filter and wash to PH=7. Add about 15 times the water of the solid quality of the filter cake to the filter cake, raise the temperature to 80°C, add stearic acid accounting for 5% of the solid mass of the filter cake, stir for 2 hours, filter, and dry at 80°C to obtain the modified zinc-aluminum hydrotalcite.

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Abstract

The invention relates to a composite heat stabilizer used in PVC, the preparation and application thereof. The composite heat stabilizer is prepared by compounding mg-al hydrotalcite and zn-al hydrotalcite according to a certain proportion. The mg-al hydrotalcite and the zn-al hydrotalcite are reasonably modified and excellently compounded by stearic acid, which can greatly save the energy consumption, increases the efficiency, and increases the thermal stability performance. In the aspect of heat stability performance, the product is non-toxic and efficient, has low cost, good initial coloration, transparency, and excellent weather resistance and plasticity, and good compatibility with PVC. The use level of an additive in the course of processing does not influence the performance of products and is difficult to wear down process equipment. The products can directly use no-toxic products to finish the substitutions of cadmium free, lead free and bromine free of export products, further is applicable to other relative industries and fields, has wide application prospect.

Description

technical field [0001] The invention belongs to the development field of material science application technology, and specifically relates to a composite heat stabilizer for PVC, and also relates to its preparation and application. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose plastics in the world, with an annual output of more than 30 million t / a in the world. The promotion and application of polyvinyl chloride chemical building materials have enabled the rapid development of PVC. Although PVC has good wear resistance, high dielectric properties and low price. Its processing temperature (above 160°C) is higher than its decomposition temperature (130°C). Therefore, heat stabilizers must be added to PVC to prevent or slow down its thermal degradation during thermal processing and use. Heat stabilizers currently used for PVC mainly include lead salts, metal soaps, organotins, rare earths and composite heat stabilizers. [0003] L...

Claims

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Application Information

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IPC IPC(8): C08K9/04C08L27/06C08K3/34
Inventor 杨占红易师刘庆艳迟伟伟王升威王素琴刘东任廖建平胡俊
Owner CENT SOUTH UNIV
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