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New process for SG3 type PVC (polyvinyl chloride) resin production

A PVC resin and new process technology, applied in the new process field of SG3 type PVC resin production, can solve the problems of low production efficiency and long polymerization reaction time, and achieve the effects of improving production capacity, good economic benefits and power saving

Active Publication Date: 2010-06-16
昊华宇航化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new process for the production of SG3 type PVC resin, which can overcome the defects of long polymerization reaction time and low production efficiency of the current SG3 production process

Method used

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  • New process for SG3 type PVC (polyvinyl chloride) resin production
  • New process for SG3 type PVC (polyvinyl chloride) resin production
  • New process for SG3 type PVC (polyvinyl chloride) resin production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] at 70m 3 Add 22t vinyl chloride monomer, 33t pure water, 350Kg dispersant 1, 140Kg dispersant 2, 120Kg initiator, 4.4Kg chain extender diallyl maleate, 10Kg fatty acid zinc heat stabilizer and 35Kg KZ heat-resistant terminator; dispersant 1 is polyvinyl alcohol aqueous solution with alcoholysis degree of 88%, mass concentration 6%; dispersant 2: hydroxypropyl methylcellulose aqueous solution, referred to as HPMC, mass concentration 4%; initiator It is an aqueous solution of bis(2-ethylhexyl) peroxydicarbonate, referred to as EHP, with a mass concentration of 10%. The polymerization reaction temperature is 55-56° C., and the reaction time is 5.5 hours. The produced PVC resin product has reached the excellent product index in Table 2 (quality grade specification table of SG3 type PVC resin).

Embodiment 2

[0019] at 70m 3 Add 24t vinyl chloride monomer, 32t pure water, 382Kg dispersant 1, 153Kg dispersant 2, 125Kg initiator, 4.8Kg chain extender diallyl maleate, 10Kg fatty acid zinc thermal stabilizer and 35KgKZ heat-resistant terminator; dispersant 1 is polyvinyl alcohol with alcoholysis degree of 88%, concentration 4%; dispersant 2: hydroxypropyl methylcellulose, referred to as HPMC, concentration 3%; initiator is peroxydicarbonic acid Bis(2-ethylhexyl ester), referred to as EHP, the concentration is 8%. The polymerization reaction temperature is 56-58°C, the reaction time is 5.3 hours, and the produced PVC resin product has reached the index of superior products.

Embodiment 3

[0021] at 70m 3 Add 24t vinyl chloride monomer, 31.5t pure water, 360Kg dispersant 1, 150Kg dispersant 2, 130Kg initiator, 5.1Kg chain extender diallyl maleate, 5Kg fatty acid zinc heat stabilizer into the reaction kettle And 35KgKZ heat-resistant terminator; Dispersant 1 is polyvinyl alcohol with alcoholysis degree of 88%, concentration 8%; Dispersant 2: hydroxypropyl methylcellulose, referred to as HPMC, concentration 6%; Initiator is diperoxide Bis(2-ethylhexyl)carbonate, referred to as EHP, has a concentration of 12%. The polymerization reaction temperature is 54-55° C., and the reaction time is 5.8 hours. The produced PVC resin product has reached the index of superior products.

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Abstract

The invention relates to a new process for SG3 type PVC (polyvinyl chloride) resin production, which comprises the following steps of: adding a vinyl chloride monomer, pure water, a dispersant, an initiator and a conventional amount of thermal stabilizer and terminator into a reaction kettle, and meanwhile adding a chain extender of maleic acid di-allyl ester into the reaction kettle; wherein the reaction kettle is in a middle size, the mass proportion of the monomer, the pure water, the dispersant, the initiator and the chain extender is 20,000-25,000:30,000-33,000:490-530:120-140:4.5-5.5, and the temperature of polymerization reaction is 54-58 DEG C. Under the condition of no changing of traditional main production equipment, the invention adjusts the proportioning of relevant auxiliary agents, improves the temperature of the polymerization reaction, optimizes the control conditions of the production, and shortens the time of the polymerization reaction for about 60 minutes while adding a proper amount of the chain extender in a production formula, thereby saving power and energy consumption, improving production capacity of the equipment, and having safe and stable production system operation and better economic benefit.

Description

(1) Technical field [0001] The invention relates to a new process for producing SG3 type PVC resin. (2) Background technology [0002] At present, there are more than a dozen varieties of PVC resins produced in my country, such as SG8, ​​SG7, SG5, and SG3. Among them, SG5 and SG3 have the largest output of PVC resins, and the output of other resins is relatively small. The production of polyvinyl chloride resin (PVC resin) is often limited due to the long production cycle, so shortening the polyvinyl chloride polymerization reaction time, increasing the polymerization speed, and improving production efficiency have always been the subject of research in the field of PVC industrial production technology. At present, the technical means commonly used to shorten the polymerization reaction time include: developing new composite initiators and dispersants; adopting computer numerical control technology; adopting various measures to enhance heat transfer, such as adding reflux co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F222/28C08F2/20
Inventor 陈国正王志勇王松波毛晓军赵述彬韩金娥
Owner 昊华宇航化工有限责任公司
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