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Synthesis method for hydrocalumites and hydrocalumites based PVC complex heat stabilizer

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

Active Publication Date: 2014-11-19
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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  • Synthesis method for hydrocalumites and hydrocalumites based PVC complex heat stabilizer
  • Synthesis method for hydrocalumites and hydrocalumites based PVC complex heat stabilizer
  • Synthesis method for hydrocalumites and hydrocalumites based PVC complex heat 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, and the pH of the mixed solution is controlled at 10-11. Stir for 3 hours, and 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 Ca2+ / 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 invention relates to a synthesis method for hydrocalumites and a hydrocalumites based PVC complex heat stabilizer. The synthesis method comprises the following steps: performing co-precipitation reaction on the water solution of calcium salt and the water solution of aluminium salt under the existence of soluble carbonate and caustic alkali, so as to synthesize hydrocalumites, wherein the calcium salt comprises hydrated calcium chloride, the aluminium salt comprises aluminium chloride and sodium metaaluminate, the soluble carbonate comprises Na2CO3 or K2CO3, the caustic alkali comprises NaOH or KOH, and the typical structure of the hydrocalumites is Ca6Al2(OH)16CO3 . 4H2O and Ca4Al2(OH)12CO3 . 4H2O; preparing the hydrocalumites based PVC complex heat stabilizer from the hydrocalumites , calcium soaps, zinc soaps, a lubricant, a chelating agent and an antioxygen according to an appropriate proportion. Compared with the conventional PVC complex heat stabilizer, the hydrocalumites based PVC complex heat stabilizer provided by the invention has better preliminary hue and longer color-maintaining effect on the PVC and other superpolymers containing chlorine, and the long-term heat stability is excellent; besides, the PVC complex heat stabilizer has the characteristics of no toxicity, environmental protection, low cost, rich raw materials, and great convenience for manufacture and the like.

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 Applications(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
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