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Preparation method and application of zinc-aluminum-magnesium hydrotalcite-based PVC complex heat stabilizer

A technology of compound heat stabilizer and zinc-magnesium-aluminum water, applied in the direction of dyeing low-molecular-weight organic compounds, fibrous fillers, etc., can solve the problems of odor, expensive organic tin, environmental pollution, etc., and achieves simple and convenient process operation. The effect of industrial production

Active Publication Date: 2012-05-23
湖南雄创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead and cadmium compounds are highly toxic to human health and pollute the environment. Organotin is expensive and has an odor
Now the non-toxic calcium and zinc composite stabilizer is a popular product, but the thermal stability of calcium and zinc soap-based stabilizers is not good, and people are looking for better new materials to cooperate with calcium and zinc soap. Heat stabilizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 29 grams of Al 2 (SO 4 ) 3 ·18H 2 O(0.043mol)·21.2g MgSO 4 7H 2 O(0.086mol)25g ZnSO 4 ·7H 2 O(0.086mol) is mixed and 200ml of water is added to make a mixed salt solution; weigh 9 grams of Na 2 CO 3 (0.085mol)·16g of NaoH (0.4mol) and 200ml of water to make a mixed alkali solution. Drop into the reaction flask with electric stirring and water bath heating at the same speed, and complete the addition within 30 minutes. Control the temperature of the reaction solution to 75±2°C and stir for 1.5 hours, and then keep the temperature at 65°C for 12 hours to crystallize. Then increase the temperature to 75°C and add stearic acid with solid content of 6%, stir for 1.5 hours, filter, wash the filter cake, the pH of the washing water is close to 7, dry the filter cake, pulverize and grind to obtain Zn / Mg / AL=1:1:1 The surface modified hydrotalcite.

Embodiment 2

[0030] Weigh 29 grams of Al 2 (SO 4 ) 3 ·18H 2 O(0.043mol), 26.3g MgSO 4 ·7H 2 O(0.103mol), 30.3g ZnSO 4 ·7H 2 O (0.103mol), add 200ml of water after mixing to make a mixed salt solution; weigh 9 grams of Na 2 CO 3 (0.085mol), 18 grams of NaOH (0.45mol), add 200ml of water to make a mixed alkali solution. Drop the two solutions into the reaction flask with electric stirring and water bath heating at the same speed, and complete the addition within 30 minutes. Control the temperature of the reaction solution to 75±2℃, stir and react for 1.5 hours, then keep 60-65℃ to crystallize 15 hours. Then increase the temperature to 75℃ and add stearic acid with solid content of 6%, stir for 1.5 hours, filter, wash the filter cake, the pH of the washing water is close to 7, dry the filter cake, pulverize and grind to obtain Zn / Mg / Al=1.2:1.2:1 The surface modified hydrotalcite.

Embodiment 3

[0032] Weigh 29 grams of Al 2 (SO 4 ) 3 ·18H 2 O(0.043mol), 32.4g ZnSO 4 ·7H 2 O(0.112mol), 21.2g MgSO 4 ·7H 2 O (0.086mol), add 200ml of water to make a mixed salt solution; weigh 9 grams of Na 2 CO 3 (0.085mol), 17g of NaOH (0.425mol), add water not 200ml to make a mixed alkali solution. Drop the two solutions into a reaction flask with electric stirring and water-soluble heating at the same speed, and complete the addition within 30 minutes. Control the temperature of the reaction solution to 75±2°C, stir and react for 1.5 hours, and then add 6% of the solid content. Fatty acid, continue to stir for 1 hour, then keep the temperature at 60-65 ℃ for crystallization for 15 hours. Filter, wash the filter cake, wash the pH of the water close to 7, dry the filter cake, pulverize and grind to obtain the surface modified talc with Zn / Mg / Al=1.3:1:1.

[0033] According to the above method, changing the amount of zinc salt, magnesium salt and aluminum salt can obtain different ratios of ...

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Abstract

The invention relates to synthesis of novel zinc-aluminum-magnesium hydrotalcite and preparation of a PVC complex heat stabilizer from the hydrotalcite and calcium soap, zinc soap and the like according to a certain ratio. The complex heat stabilizer comprises the main components as [Zn1-x<2+>Mg1-x<2+>Al<3x>2x(OH)2](CO<2->3)x / n .mH2O, wherein X is more than or equal to 0.25 and less than or equal to 0.5, n is more than or equal to 0 and less than or equal to 0.1, and m is more than or equal to 0 and less than or equal to 4; while the popular hydrotalcite in market at present has the general molecular formula of [Mg<2+>1-xAlx<3+>(OH)2]CO3<2->x / 2 .mH2O. The complex heat stabilizer prepared from the hydrotalcite has the advantages of higher initial hue and long-lasting heat stability for PVC and other chlorine-containing high polymers, and has the characteristics of no toxin, no pollution, low cost, rich raw materials and the like.

Description

Technical field: [0001] The invention relates to the synthesis of a new type of zinc-magnesium-aluminum hydrotalcite for preparing PVC composite heat stabilizer. Background technique: [0002] As we all know, PVC is easy to decompose under processing temperature conditions, and stabilizers must be added to make it processed smoothly. A lot of research work has been done on the stabilization of PVC at home and abroad. So far, the most widely used heat stabilizers are basic lead salts, metal soaps (Ba, Cd, Ca, Zn), organic tin compounds, etc. Lead and cadmium compounds are more toxic to human health and cause pollution to the environment. Organotins are expensive and smelly. Now the non-toxic calcium and zinc compound stabilizers are popular products, but the stabilizers based on calcium and zinc soaps have poor thermal stability. People are looking for better new materials to complement the new calcium and zinc soap compounds. Heat stabilizers. Therefore, hydrotalcite, a new fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K13/06C08K9/04C08K5/098C08K5/07C09C1/40C09C3/08C08L27/06
Inventor 彭召林
Owner 湖南雄创新材料科技有限公司
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