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Synthetic method of hydrocalumite and hydrocalumite-based PVC composite thermal stabilizer

A composite heat stabilizer, hydrocalumite technology, applied in chemical instruments and methods, calcium/strontium/barium compounds, inorganic chemistry, etc., can solve the problems of expensive organic tin, environmental pollution, health hazards, etc., to achieve cost Low cost, easy manufacture, and easy process operation

Active Publication Date: 2016-09-28
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

Method used

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  • Synthetic method of hydrocalumite and hydrocalumite-based PVC composite thermal stabilizer
  • Synthetic method of hydrocalumite and hydrocalumite-based PVC composite thermal stabilizer
  • Synthetic method of hydrocalumite and hydrocalumite-based PVC composite thermal stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 36 grams of CaCl 2 2H 2 O (0.24mol), 32 grams of AlCl 3 ·6H 2 O (0.12mol), after mixing, add 260ml of water to make a mixed salt solution; weigh 13 grams of Na 2 CO 3 (0.12mol), add 130ml of water; 28 grams of NaOH (0.7mol), add 130ml of water, and dissolve them respectively to form a mixed alkali solution. The two solutions were dropped into the reaction flask with electric stirring and oil bath heating at the same speed. The addition was completed within 30 minutes, the reaction temperature was controlled to be 75±2°C, the pH of the mixed solution was controlled to be 10-11, stirred for 3 hours, and then the temperature was kept at 75°C for 12 hours of crystallization. Filter and wash the filter cake, wash the water with pH 7-8, dry the filter cake, pulverize and grind to obtain Ca 2+ / Al 3+ =2:1 hydrocalumite powder.

Embodiment 2

[0023] Weigh 36 grams of CaCl 2 2H 2 O (0.24mol), 21 grams of AlCl 3 ·6H 2 O (0.08mol), after mixing, add 260ml of water to make a mixed salt solution; weigh 11 grams of Na 2 CO 3 (0.95mol), add 130ml of water; 24 grams of NaOH (0.7mol), add 130ml of water, and dissolve them respectively to form a mixed alkali solution. The two solutions are dropped into the reaction bottle with electric stirring and oil bath heating at the same speed, and the addition is completed within 30 minutes. The reaction temperature is controlled at 75±2°C, the pH of the mixed solution is controlled at 10-11, and stirred for 3 hours, then Keep the temperature at 75°C and crystallize for 12 hours. Filter and wash the filter cake, the pH of the washing water is 7-8, dry the filter cake, pulverize and grind to obtain Ca 2+ / Al 3+ =3:1 hydrocalumite powder.

Embodiment 3

[0025] Weigh 36 grams of CaCl 2 2H 2 O (0.24mol) was added with 250ml of water to prepare calcium salt solution A; weigh 13 grams of NaAlO 2 (0.06mol) add water 130ml; 8 grams of Na 2 CO 3 (0.075mol) add 70ml of water; 6.5 grams of NaOH (0.16mol) add 50ml of water, mix the latter three solutions to form solution B, drop the two solutions of A and B into the reaction bottle with electric stirring and oil bath heating at the same speed . The addition was completed within 30 minutes, the reaction temperature was controlled at 75±2°C, and the reaction was stirred for 3 hours. Then keep at 75°C and crystallize for 12 hours. Filtration and dehydration, washing the filter cake, washing water with a pH of 7 to 8, drying the filter cake, crushing and grinding to obtain Ca 2+ / Al 3+ =2:1 hydrocalumite powder.

[0026] According to the above method, hydrocalumite with different ratios of Ca / Al can be obtained by changing the amount of calcium salt and aluminum salt.

[0027] Com...

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Abstract

The method for synthesizing hydrocalumite and its hydrocalumite-based PVC composite thermal stabilizer is to synthesize hydrocalumite by co-precipitation reaction with an aqueous solution of calcium salt and aluminum salt in the presence of soluble carbonate and caustic alkali; the calcium salt includes Calcium chloride hydrate, aluminum salts include aluminum chloride, sodium metaaluminate; soluble carbonates include Na 2 CO 3 or K 2 CO 3 , the caustic includes NaOH or KOH; the typical structure of hydrocalumite is Ca 6 Al 2 (OH) 16 CO 3 • 4H 2 O and Ca 4 Al 2 (OH) 12 CO 3 • 4H 2 O. The hydrocalumite, calcium soap, zinc soap, lubricant, chelating agent and antioxidant are formulated in proper proportions to prepare the hydrocalumite-based PVC composite thermal stabilizer. Compared with traditional PVC composite heat stabilizers, the hydrocalumite-based PVC composite heat stabilizer of the present invention has better initial hue and long-term color retention effect on PVC and other chlorine-containing high polymers, and has good long-term heat stability. It has the characteristics of non-toxic, environmental protection, low cost, abundant raw materials, and convenient manufacture.

Description

technical field [0001] The invention relates to a synthetic method of hydrocalumite and simultaneously relates to a hydrocalumite-based PVC composite thermal stabilizer. Background technique [0002] Polyvinyl chloride (PVC) is easy to decompose under processing temperature conditions, and a stabilizer must be added to make it process smoothly. Traditional heat stabilizers are mainly basic lead salts, metal soaps (Ba, Cd, Zn, Ca) organotin compounds, etc. Lead and cadmium compounds are highly toxic to human health and pollute the environment. Organotin is expensive and has an odor. On this basis, people have developed environmentally friendly hydrotalcite and calcium-zinc composite stabilizers to replace lead and cadmium stabilizers, and achieved good results. Existing many documents and patent report in this respect. [0003] Hydrotalcite, also known as layered double hydroxides (Layered Double Hydroxides, LDHs for short). Molecular composition is Mg 6 Al 2 (OH) 16 C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/00C08L27/06C08K13/02C08K3/26C08K3/32C08K5/098C08K5/10C08K5/103C08K5/07C08K5/524C08K5/134C08K5/526C08K5/13
Inventor 彭召林周喜邱政友邓联平金慧珠
Owner 湖南雄创新材料科技有限公司