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Method for producing PVC (polyvinyl chloride) paste resin and reaction recovery device

A technology of polyvinyl chloride paste and vinyl chloride monomer, applied in the field of polymer chemical production, can solve the problems of lower resin quality, long gel time, low production capacity, etc., to improve stability and product performance, and improve purity and quality, and the effect of reducing production costs

Inactive Publication Date: 2017-09-08
TANGSHAN SANYOU CHLOR ALKALI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are obvious deficiencies in the production process, polymerization formula and equipment. The existing problems include: long polymerization cycle, low production capacity; high raw material additives and energy consumption, high production cost; The mechanical strength is not high and the thermal stability is poor; the recovery system is seriously blocked, and the quality of the recovered monomer is poor. After being reused for suspension polymerization, it is easy to produce coarse material and many fish eyes in the product; after drying and crushing, the primary particles and secondary particles are mixed together, reducing the The quality grade of the resin
CN203763915U proposes a kind of mechanical defoaming method and equipment without defoaming agent, but this method does not provide the size of key parameter barbed wire, the thickness of barbed wire and the number of barbed wire layers of defoaming tower and the distance between layers , and the gas flow rate in the degassing tower is not given, so there is no practical reference value

Method used

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  • Method for producing PVC (polyvinyl chloride) paste resin and reaction recovery device
  • Method for producing PVC (polyvinyl chloride) paste resin and reaction recovery device
  • Method for producing PVC (polyvinyl chloride) paste resin and reaction recovery device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A kind of method of producing polyvinyl chloride paste resin, with reference to figure 1, taking the production of glove materials as an example. Soft water 19.5t, azobisisoheptanonitrile 3.0kg, diethoxyethyl peroxydicarbonate (EEP) 3.0kg, sodium lauryl sulfate 285kg, cetyl alcohol 210kg, diammonium hydrogen phosphate 2kg, ammonium phosphate 1kg and 19t of vinyl chloride monomers were added into the first homogenizing tank 1 under agitation, fully stirred (stirring power 3.5kw / m3) for 20 minutes, then further homogenized with the first homogenizing pump 2, and sent into the first homogenizing tank 1. The second homogenizing tank 4, when the single tank liquid level reaches 10%, the second homogenizing pump 5 is started, the emulsion is sent to the polymerization kettle 7, and the temperature is raised to 43° C. to start polymerization.

[0060] When the reaction reaches the 30th minute, the jacket and stirring cooling water volumes of the polymerization kettle are 200 ...

Embodiment 2

[0069] A method for producing polyvinyl chloride paste resin, except that the addition of azobisisoheptanonitrile is changed to 3.5kg, the addition of diethoxyethyl peroxydicarbonate (EEP) is changed to 3.3kg, and the remaining additions and average R is the same as in Example 1.

[0070] After reacting for 30 minutes, add vinyl chloride monomer at a rate of 4.75kg / min for 1000 minutes, the total amount is about 4750kg, and the polymerization time is 1042 minutes. After the reaction pressure drops by 0.2Mpa, add 22kg of terminator emulsion (BHT, diethyl Hydroxylamine, epoxidized soybean oil, Tween 80, and desalinated water are 10w / %, 10w / %, 35w / %, 1.0w / % and 44w / %, respectively).

[0071] (The conversion rate of vinyl chloride is about 90%) is unloaded into the unloading tank for recovery outside the kettle. The recovery, stripping, spray drying, grading and sieving, crushing and blending etc. outside the whole kettle are the same as in Example 1.

Embodiment 3

[0073] A kind of method for producing polyvinyl chloride paste resin, except changing sodium lauryl sulfate add-on into 256.5kg, cetyl alcohol into 189kg, all the other are completely the same as example 2. Reaction time 1039 minutes. The unreacted vinyl chloride monomer is recovered outside the kettle, and the latex (42.5°C, PH8.4, solid content 52.21%, conversion rate of vinyl chloride is about 90%) after the polymerization reaction is discharged into the unloading trough for recycling outside the kettle. Recycle. The recovery, stripping, spray drying, grading and sieving, crushing and blending etc. outside the whole kettle are the same as in Example 1.

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Abstract

The invention discloses a method for producing polyvinyl chloride paste resin, which comprises the following steps: (1) mixing vinyl chloride monomer, soft water, emulsifier, co-emulsifier, oil-soluble initiator and buffer in proportion; (2) ) performing secondary homogenization treatment on the material; (3) adding a certain amount of vinyl chloride monomer at a certain rate during the polymerization reaction; (4) adopting a mechanical defoaming device without defoaming agent to realize the recovery of vinyl chloride monomer; (5) The recovered latex is dried and classified to obtain a finished product. The present invention is an improvement to the traditional micro-suspension polyvinyl chloride paste resin production method. During the reaction process, only vinyl chloride monomer is supplemented, and no initiator, emulsifier and co-emulsifier are added. Improve the utilization rate of the polymerization tank, and at the same time, the secondary homogenization and the addition of monomers in the middle can effectively control the single and double peak distribution of the resin particle size. The classification technology effectively reduces the frequency of use of the pulverizer, reduces energy consumption, and improves economic benefits.

Description

technical field [0001] The invention relates to a polymer production method, in particular to a method for producing high-quality microsuspension polyvinyl chloride paste resin, belonging to the technical field of polymer chemical production. Background technique [0002] On the basis of vinyl chloride emulsion polymerization, PVC paste resin was developed by microsuspension polymerization of vinyl chloride. This method had been industrialized as early as the mid-1960s. The process is: first make VCM, desalted water, and emulsifier into a stable emulsion with a particle size of about 1.0 μm by mechanical homogenization, and then use an oil-soluble initiator for polymerization. The PVC paste resin produced by this method has moderate particle size, excellent fluidity, less emulsifier consumption, and improved thermal stability and water resistance of the resin. The traditional micro-suspension polymerization of vinyl chloride is divided into chemical preparation, polymerizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/06C08F2/24C08F2/01C08F2/38C08F6/16
CPCC08F114/06C08F2/01C08F2/24C08F2/38C08F6/16
Inventor 刘宝东高悦周爱存李俊猛薛立方张学辉苏永学申绍年牛应东杜建军李明徐建玲赵丽颖赵琳刘黎王林喜付恒坡刘川刘海涛孔令媛王峰周云飞李德军刘洋崔旸赵清高东超崔建兵王成亮鲍雷雷王郑华王增强刘成森董学立董博崔小英张胜男
Owner TANGSHAN SANYOU CHLOR ALKALI