Method for preparing polyvinyl chloride resin

A technology of polyvinyl chloride resin and polyvinyl alcohol, which is applied in the field of preparation of polyvinyl chloride resin, can solve problems such as difficult control of granulation process, method of reducing sticky matter, technology cannot be applied, etc., and achieves the prospect of large-scale industrialization, The particle size is easy to control and the effect of industrial operation is strong

Inactive Publication Date: 2017-05-31
FOSHAN RUIJIAN SPORTS EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology uses a special type of dispersant, the operation is complicated, it is difficult to control the granulation process, and it is prone to coarse material, shaft holding, etc.
[0007] Shanghai Chlor-Alkali published a patent for the preparation of high-porosity resin, CN1927898A, a composite dispersion system composed of PVA and HPMC with low alcoholysis degree and low viscosity, and a porosity regulator as an auxiliary agent, which was prepared by suspension polymerization of vinyl chloride. High porosity resin, but the exposed part of the resin surface film is less, and the internal pores are less and unevenly distributed
[0008] Domestic Zhejiang University's patent CN87,1,01663A uses magnesium hydroxide as the main dispersant, uses two types of porosity regulators with different properties as auxiliary dispersants, and uses water-soluble inorganic salts as auxiliary agents to carry out suspension polymerization of vinyl chloride to prepare Loose, non-grafted copolymer film and polyvinyl chloride particles with high apparent density, and a method to reduce sticky matter, but the resin particles are very thick, and the technology cannot be applied yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The polymerization reaction is carried out in a kettle with a volume of 5 L, where the stirring is a two-layer flat paddle, the bottom tube and the galvanic sleeve are used as baffles. The technical conditions and process are briefly described as follows: first, 2.1Kg desalted water, PVA (I) 0.19g, PVA (II) 0.68g, HPMC 0.68g, 0.7g sorbitan monostearate (HLB 4.7), 0.10g 2-mercaptoethanol, 0.5g azobisisoheptanonitrile, 0.5g NH 4 HCO 3Put it into the kettle, start stirring after the pressure test, add 1.4Kg of VCM after vacuuming to -0.90MPa, raise the temperature to 62°C to start polymerization, keep the polymerization temperature until the polymerization pressure drops by 0.15MPa, add 0.3g diethylhydroxylamine to terminate the reaction, and automatically After the monomer is recovered by pressure, the material is discharged, and the PVC resin is obtained after centrifugal drying.

[0031] The above dispersant PVA (Ⅰ) is polyvinyl alcohol with a degree of alcoholysis of...

Embodiment 2

[0034] Change the add-on of dispersant PVA (I) into 0.26g, change the add-on of dispersant PVA (II) into 1.60g, change the add-on of dispersant HPMC into 0.40g, and other processing conditions are the same as embodiment 1, and its test results are as follows : K value 58, apparent density 0.42 (g / ml), 100 g resin plasticizer absorbs 33 g, average particle size 110.0 (μm), distribution width 1.20.

Embodiment 3

[0036] Change the add-on of dispersant PVA (I) into 0.22g, change the add-on of dispersant PVA (II) into 1.10g, change the add-on of dispersant HPMC into 0.40g, and other process conditions are the same as embodiment 1, and its test results are as follows : K value 57, apparent density 0.46 (g / ml), 100 g resin plasticizer absorbs 30 g, average particle size 113.0 (μm), distribution width 1.20.

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PUM

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Abstract

The invention discloses a method for preparing polyvinyl chloride resin. The method is characterized by comprising the following steps: adding water, a vinyl chloride monomer, a composite dispersion system, a porosity adjusting agent, a chain transferring agent, a pH value buffer agent and an initiator into a polymerization kettle, performing a polymerization reaction kettle in the polymerization reaction kettle with a stirring device at the pressure of 1.00-1.20MPa, adding a reaction terminator, discharging out a residual vinyl chloride monomer, and collecting a target product from a reaction product, wherein the composite dispersion system is a mixture of polyvinyl alcohol and hydroxypropyl methyl cellulose which are subjected to partial alcoholysis. The polyvinyl chloride resin prepared by using the method disclosed by the invention is high in porosity, slight in fisheye, low in surface cover rate, tidy in granule morphology, concentrated in resin particle size distribution and easy in residual monomer desorption.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of polyvinyl chloride resin. Background technique [0002] Low degree of polymerization polyvinyl chloride (PVC) resin generally refers to polyvinyl chloride (PVC) resin with a degree of polymerization below 800. Due to its low molecular weight, high apparent density, good melt fluidity, short plasticizing time, and easy processing, it is widely used in the manufacture of sheets, injection molding pipe fittings, blow molding, and modified resins (such as deep chlorination to produce chlorinated polyvinyl chloride). Vinyl chloride resin) and so on are widely used. [0003] However, the porosity of PVC resin with low degree of polymerization is low, the resin particles are relatively compact, and the particle film produced by the graft copolymerization of dispersant and vinyl chloride is relatively thick, which affects the processing perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/06C08F2/20C08F2/38
CPCC08F114/06C08F2/20C08F2/38
Inventor 邹明瑞
Owner FOSHAN RUIJIAN SPORTS EQUIP CO LTD
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