Preparation method of magnesium aluminum lanthanum type hydrotalcite PVC composite heat stabilizer

A composite thermal stabilizer, hydrotalcite technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry, etc., can solve the problems of pollution, high cost, complicated preparation process, etc., and achieve simplified steps and good thermal stability effect. , the effect of simple preparation process

Inactive Publication Date: 2014-01-15
NANCHANG UNIV
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Problems solved by technology

[0005] Most of the existing hydrotalcite-based PVC composite heat stabilizers need to be formulated with various solutions during the preparation process, or modified with organic acids or titanates, or compounded with various heat stabilizers, so that the prepared More production raw materials are used in the process, the cost becomes higher, the preparation process becomes complicated, and at the same time, more pollution may be generated in the production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0013] Magnesium-aluminum-lanthanum hydrotalcite was synthesized by heating precipitation. Specific examples are as follows:

[0014] 1) Weigh 5.12 g of magnesium nitrate, 2.25 g of aluminum nitrate and 1.73 g of lanthanum nitrate, dissolve in 50 mL of distilled water to make mixed solution A, preheat to 80 °C; take 2.86 g of sodium hydroxide and 1.06 g of anhydrous sodium carbonate to dissolve Prepare mixed solution B in 50mL distilled water, preheat to 80 °C;

[0015] 2) Preheat 50mL of distilled water in a 250mL three-neck flask and preheat to 80 °C;

[0016] 3) Pour the mixture A and B into the three-neck flask in the step and stir vigorously for 2 h;

[0017] 4) After the stirring was stopped, the slurry was allowed to stand at 90 °C for 24 h to crystallize;

[0018] 5) Filter the crystallized hydrotalcite slurry at 90 °C and wash it thoroughly with hot water until the filtrate is PH<8;

[0019] 6) Dry the filter cake in step 5) at 80°C, and then seal it for storag...

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Abstract

The invention relates to a preparation method of a magnesium aluminum lanthanum type hydrotalcite PVC composite heat stabilizer. The heat stabilizer is composed of carbonate of magnesium aluminium lanthanum, and synthesized by a heating precipitation method. The method provided by the invention only needs preparation of a mixed salt solution and a mixed alkali solution and omits organic acidity or titanate modification, so as to simplify steps; and only atmospheric precipitation rather than pressurized aging is required; therefore the preparation process is simple, saves cost and causes no pollution.

Description

technical field [0001] The invention relates to a new hydrotalcite PVC composite thermal stabilizer, in particular to a preparation process of the magnesium-aluminum-lanthanum hydrotalcite PVC composite thermal stabilizer. Background technique [0002] Polyvinyl chloride (PVC) is one of the most widely used plastic products at present. It is favored by consumers because of its cheapness, high strength, corrosion resistance and good transparency. However, due to external factors such as light, heat, oxygen and other factors, PVC is prone to degradation and crosslinking reactions, making it difficult to process and degraded in performance. Aging and degradation are inevitable problems in the process of PVC processing, so some stabilizers should be added in the process of PVC processing to improve the performance of PVC. [0003] Hydrotalcite heat stabilizer is a new type of inorganic PVC auxiliary stabilizer developed in Japan in the 1980s. Its heat stabilization effect is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C08L27/06C08K3/26
Inventor 谌伟庆
Owner NANCHANG UNIV
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