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Process for preparating medical polyvinyl chioride resin with high polymerization

A polyvinyl chloride resin, high degree of polymerization technology, applied in the direction of pipes, etc., can solve the problems of high residual vinyl chloride content and poor thermal stability, and achieve the effect of regular particle shape, easy plasticization, and concentrated resin particle size distribution

Inactive Publication Date: 2005-08-24
上海天原集团天原化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a preparation method of medical high-polymerization polyvinyl chloride resin, to overcome the toxic substances containing toluene and nitrile groups in the prior art, high residual vinyl chloride content, and poor thermal stability Defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 14 kg of vinyl chloride monomer, 0.18 kg of diethylhexyl peroxydicarbonate, aqueous emulsion with cumene peroxide neodecanoate content of 10-50%, 0.02 kg of polyvinyl alcohol with high degree of alcoholysis, medium Add polyvinyl alcohol with alcoholysis degree and low alcoholysis degree polyvinyl alcohol, 0.06 kg of additives and 25.2 kg of water into the polymerization kettle. There are 2 baffles in the kettle, and the stirring speed is 360 rpm. , react for 10 to 12 hours, add 0.03 kg of terminator to obtain a medical high-polymerization polyvinyl chloride resin water suspension, remove unreacted vinyl chloride monomer, centrifugal dehydration and drying, and obtain the finished product.

Embodiment 2

[0020] 14 kg of vinyl chloride monomer, 0.30 kg of water emulsion containing 10-50% diethylhexyl peroxydicarbonate, 0.018 kg of polyvinyl alcohol with high degree of alcoholysis and polyvinyl alcohol with medium degree of alcoholysis, and 0.06 kg of additives Add 25.2 kg of water into the polymerization kettle, set 2 baffles in the kettle, stir at 360 rpm, react for 12 to 14 hours at a temperature of 35°C, and add 0.03 kg of terminator to obtain medical high polymerization The water suspension of polyvinyl chloride resin, remove the unreacted vinyl chloride monomer, centrifugal dehydration and drying to obtain the finished product.

Embodiment 3

[0022] 14 kg of vinyl chloride monomer, 0.18 kg of diethylhexyl peroxydicarbonate, cumyl peroxide neodecanoate, and 10-50% aqueous emulsion of tert-butyl peroxyneodecanoate, 0.02 kg Add polyvinyl alcohol with high degree of alcoholysis and polyvinyl alcohol with low degree of alcoholysis, 0.06 kg of additives and 25.2 kg of water into the polymerization kettle. There are 2 baffles in the kettle, and the stirring speed is 360 rpm. , react for 8-10 hours, and add 0.03 kg of terminator to obtain a medical high-polymerization degree polyvinyl chloride resin water suspension, remove unreacted vinyl chloride monomer, centrifugal dehydration and drying, and obtain the finished product.

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Abstract

A process for preparing the medical polyvinyl chloride resin with high polymerization degree includes such steps as adding vinyl chloride, trigger, disperser, assistant and water to reactor, polymerizing reaction, adding reaction-stopping agent, removing excessive vinyl chloride, centrifugal dewatering and drying.

Description

technical field [0001] The invention relates to a preparation method of polyvinyl chloride resin, in particular to a preparation method of medical high-polymerization polyvinyl chloride resin used in the production of disposable blood transfusion (liquid) film bags, catheters, droppers and other medical accessories . Background technique [0002] Polyvinyl chloride (PVC) resin is one of the five general-purpose plastics. It has a wide range of uses and a large output. According to statistics, it is the second largest variety after polyethylene in the world. The production capacity of PVC resin in my country accounts for the world's total production capacity. About 8% of the capacity is expected to reach 4 million tons in 2004. [0003] In the processing of PVC resin, due to the many defects of ordinary PVC resin, its application in high-end products is restricted. HPVC (highly polymerized PVC resin) was first successfully developed in Japan in the 1960s. After the 1980s, ma...

Claims

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Application Information

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IPC IPC(8): A61L29/04C08F2/20C08F4/34C08F114/06
Inventor 林宝春俞昉
Owner 上海天原集团天原化工有限公司
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