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Preparation method for high-brightness calcium acetylacetonate for PVC (Polyvinyl Chloride) heat stabilizer

A heat stabilizer and whiteness acetylation technology, which is applied in the field of preparation of high whiteness calcium acetylacetonate, can solve the problems of bubbles in PVC products, and the production of high whiteness calcium acetylacetonate has not been seen, and achieves low cost and high cost performance , good quality effect

Active Publication Date: 2013-05-08
ZHEJIANG TRANSFAR WHYYON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of calcium acetylacetonate with two crystal waters, which is always operated at a lower temperature, should not be used as a PVC stabilizer, because the crystal water may cause air bubbles in PVC products.
[0012] There is no report about the preparation of high whiteness calcium acetylacetonate in other documents

Method used

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  • Preparation method for high-brightness calcium acetylacetonate for PVC (Polyvinyl Chloride) heat stabilizer
  • Preparation method for high-brightness calcium acetylacetonate for PVC (Polyvinyl Chloride) heat stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 220g CaCl 2 ·6H 2 O was placed in a 500ml beaker and dissolved in 150ml deionized water. Filter the solution with qualitative filter paper, transfer the clear liquid into a 500ml flask, and adjust the pH value to 2.0 with 1M hydrochloric acid. Slowly add 10ml of commercially available chlorine bleach (bleach water) while stirring within 10 minutes, and then slowly heat up to 80°C , continue to insulate and stir for 1h. Add a small amount of milk of lime to adjust the pH of the solution to 7.0. Filter to obtain a colorless and transparent calcium chloride solution.

Embodiment 2

[0047] 220g CaCl 2 ·6H 2 O was placed in a 500ml beaker and dissolved in 150ml deionized water. The solution was filtered with qualitative filter paper, the clear liquid was transferred to a 500ml flask, and the pH value was adjusted to 5.0 with 1M hydrochloric acid. Raise the temperature to 80°C, add the calculated amount of dilute potassium permanganate solution dropwise while stirring, the solution will first turn reddish and then disappear within a short time at the end of the dropwise addition. Add a small amount of milk of lime to adjust the pH of the solution to 7.0. Filter to obtain a colorless and transparent calcium chloride solution.

Embodiment 3

[0049] 220g CaCl 2 ·6H 2 O was placed in a 500ml beaker and dissolved in 150ml deionized water. Filter the solution with qualitative filter paper, transfer the clear liquid into a 500ml flask, and adjust the pH value to 3.0 with 1M hydrochloric acid. Slowly add 10ml of 30% hydrogen peroxide dropwise while stirring within 10 minutes, then slowly raise the temperature to 80°C, and continue to keep warm Stir for 1h. Add a small amount of milk of lime to adjust the pH of the solution to 7.0. Add 3g magnesium hexasilicate (2MgO 6SiO 2 ·xH 2 O), and stirred for 1 h. Filter through qualitative filter paper to obtain a colorless and transparent calcium chloride solution.

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Abstract

The invention discloses a preparation method for high-brightness calcium acetylacetonate for PVC (Polyvinyl Chloride) heat stabilizer. A report about the preparation of high-brightness calcium acetylacetonate is not provided at present. The preparation method comprises the following steps of: oxidizing divalent iron ion and divalent manganese iron in a calcium chloride aqueous solution into trivalent iron ion and tetravalent manganese by oxidant, respectively; adjusting the pH value of the solution, so that iron and manganese are separated from the liquid phase in the forms of ferric hydroxide precipitates and hydrated manganese dioxide precipitates; filtering the solution to obtain calcium chloride solution free of iron and manganese impurities after the solution is treated by an adsorbent; preparing calcium chloride into calcium hydroxide by a conventional method; and enabling calcium chloride and acetylacetone to react to generate high-brightness calcium acetylacetonate. The preparation method disclosed by the invention is low in cost, good in quality and high in cost performance; and the obtained high-brightness calcium acetylacetonate is compounded with other additives to form the PVC heat stabilizer, so that the PVC product has good initial brightness during the processing process.

Description

technical field [0001] The invention relates to a preparation method of high-whiteness calcium acetylacetonate used as a PVC heat stabilizer. Background technique [0002] As we all know, PVC is a very important plastic variety. As one of the five general-purpose plastics in the world, the global demand for PVC resin ranks third after PE and PP, while the demand in China has risen to the first. At present, the production capacity of PVC resin processed into plastic products in China has exceeded 10 million tons per year, and the demand for it in many fields such as construction, medical, packaging, daily use, transportation, and communication is showing a rapid growth trend. There is still a lot of room for development in a fairly long period of time in the future. [0003] The development of the PVC industry is largely due to the invention and use of various additives. This is because there are many problems in the physical and chemical properties of PVC resin, such as ea...

Claims

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Application Information

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IPC IPC(8): C07C49/14C07C45/77C01F11/32C08L27/06C08K5/07
Inventor 晏苏学沈伟黄铁农施海峰
Owner ZHEJIANG TRANSFAR WHYYON CHEM
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