Preparation method of polyvinyl chloride resin containing brucite and capable of being processed directly

The technology of polyvinyl chloride resin and hydrotalcite is applied in the field of preparation of directly processable polyvinyl chloride resin, which can solve the problems of reducing the density of burning smoke and the like, and achieve the effect of good thermal stability.

Inactive Publication Date: 2010-03-17
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We have prepared a modified PVC resin with good dispersion of nano-hydrotalcite by intercalation or surface-modified nano-hydrotalcite and vinyl chloride in-situ polymerization, the thermal stability of the resin is improved, and the combustion smoke density is reduced (Bao Yongzhong, Huang Zhiming, Weng Zhixue. ZL200410017944.6, ZL 200710069334.4), but the obtained PVC resin still needs to be processed by adding a main heat stabilizer, and it is not a PVC resin that can be directly processed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Adopt wet method, with stearic acid surface modification magnesium / aluminum ratio is 2 / 1, interlayer anion is the hydrotalcite of carbonate group (Dalian Fumeida New Material Co., Ltd); the hydrotalcite of 0.5g surface modification, 2.5 Add g Ca / Zn composite heat stabilizer, 0.10g diethylhexyl peroxydicarbonate, 100g vinyl chloride, 0.15g polyvinyl alcohol dispersant and 200g deionized water into the reactor, stir, and heat up to 57°C for polymerization Reaction, when the pressure of the polymerization system drops by 2.0kg / cm 2When the reaction is finished, unreacted vinyl chloride is reclaimed, discharged, filtered, and dried to obtain 86.5g of hydrotalcite-containing PVC resin that can be directly processed. The heat stability time of the processed PVC pellets at 180° C. is 75 minutes.

Embodiment 2

[0022] Using a wet method, the hydrotalcite (Dalian Fumeida New Material Co., Ltd.) with stearic acid surface modified magnesium / aluminum ratio of 2 / 1 and interlayer anion as carbonate; 0.1g modified hydrotalcite, 3.0g Ca / Zn composite heat stabilizer, 0.10g diethylhexyl peroxydicarbonate, 100g vinyl chloride, 0.15g polyvinyl alcohol dispersant and 200g deionized water are added to the reactor, stirred, and the temperature is raised to 57° C. to start the polymerization reaction. The pressure drop of the polymerization system is 2.0kg / cm 2 When the reaction is finished, unreacted vinyl chloride is recovered, discharged, filtered, and dried to obtain 87.0 g of hydrotalcite-containing PVC resin that can be directly processed. The thermal stability time of the processed PVC pellets at 180° C. was 82 minutes.

Embodiment 3

[0024] Adopt wet method, with stearic acid surface modification magnesium / aluminum ratio is 2 / 1, interlayer anion is the hydrotalcite of carbonate (Dalian Fumeida New Material Co., Ltd.); 1.0g modified hydrotalcite, 2.5g Ca / Zn composite heat stabilizer, 0.10g diethylhexyl peroxydicarbonate, 100g vinyl chloride, 0.15g polyvinyl alcohol dispersant and 200g deionized water were added to the reactor, stirred, and the temperature was raised to 57°C to start the polymerization reaction. When the pressure of the polymerization system drops by 2.0kg / cm 2 When the reaction was finished, the unreacted vinyl chloride was recovered, discharged, filtered, and dried to obtain 86.5g of directly processable polyvinyl chloride resin containing hydrotalcite. The thermal stability time of the processed PVC pellets at 180° C. was 72 minutes.

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Abstract

The invention discloses a preparation method of polyvinyl chloride resin containing brucite and capable of being processed directly. The preparation method comprises the following steps: adding 100g of chloroethylene, 0.1 to 1.5g of brucite with surface-modified fatty acid, 1.0 to 3.0g of heat stabilizer, 0.02 to 1.5g of initiator, 0.05 to 0.25g of dispersing agent and 100 to 250g of deionized water into a polymerizer, stirring, rising the temperature to 45 to 65 DEG C for polymerization, recovering unreacted monomers after the reaction is finished, filtering, drying and obtaining the polyvinyl chloride resin. The brucite and the heat stabilizer in the polyvinyl chloride resin prepared by the method have uniform dispersion, and the resin is characterized by long heat stabilization time anddirect processing, and can be used for producing agricultural films, cable materials and building materials.

Description

technical field [0001] The invention relates to a compound and a preparation method thereof, in particular to a preparation method of a directly processable polyvinyl chloride resin containing hydrotalcite. Background technique [0002] Polyvinyl chloride (PVC) has the characteristics of good comprehensive mechanical properties, flame retardancy, chemical corrosion resistance, etc., and can obtain hard, semi-rigid and soft products according to the amount of plasticizer added to meet different use requirements. However, PVC also has disadvantages such as poor thermal stability, large amount of combustion smoke, and low impact strength of hard products. The molecular structure of PVC contains a small amount of unstable chemical defect structures, such as the tertiary chlorine structure due to molecular branching, the allyl chloride structure coexisting with the double bond structure, etc. These unstable structures will lead to PVC molecules when they are processed and heated....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F14/06C08F2/44C08K9/04C08K3/26C08K3/28C08K3/32
Inventor 包永忠黄志明王杰翁志学
Owner ZHEJIANG UNIV
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