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Preparation method of PVC (polrvinyl chloride) resin with high porosity and low film coverage rate

A technology of polyvinyl chloride resin and porosity, which is applied in the field of preparation of polyvinyl chloride resin with low polymerization degree, high porosity and low film coverage, and can solve the problem of unapplicable technology, coarse resin particles, and methods of reducing sticky matter And other issues

Inactive Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 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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  • Preparation method of PVC (polrvinyl chloride) resin with high porosity and low film coverage rate
  • Preparation method of PVC (polrvinyl chloride) resin with high porosity and low film coverage rate

Examples

Experimental program
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Embodiment 1

[0052] 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: firstly 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 3 Put 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.

[0053] Above dispersant PVA (I) is alcoholysis degree 80% (mol fraction), the polyviny...

Embodiment 2

[0056] 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 process 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

[0058] 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 processing 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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Abstract

The invention discloses a preparation method of a PVC resin with high porosity and low film coverage rate, which adopts suspension polymerization. The preparation method is characterized in that the preparation method comprises the following steps: 1, adding water, a vinyl chloride monomer, a composite dispersion system, a porosity conditioning agent, a chain transferring agent, a pH buffer and an initiator to a polymerization reactor; 2, carrying out a polymerization reaction on above materials in the polymerization reactor under conditions that the pressure is 0.90-1.20MPa and the temperature is 50-75DEG C; 3, adding a reaction terminator when the polymerization temperature is maintained and the polymerization pressure is decreased to 0.1-0.30MPa; 4, discharging the residual vinyl chloride monomer; and 5, collecting the target product from reaction products, wherein the composite dispersion system is a mixture of partially-alcoholized polyvinyl alcohol and partially-alcoholized hydroxypropyl methyl cellulose. The PVC resin prepared with the method disclosed in the invention has the advantages of high porosity, less fisheye, low film coverage rate, structured particle form, concentrated resin particle size distribution, and easy residual monomer removal.

Description

technical field [0001] The invention belongs to the field of macromolecular polymerization, in particular to a preparation method of polyvinyl chloride resin with low polymerization degree, high porosity and low film coverage. 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 chlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/06C08F2/44C08F2/38C08F2/20C08K5/151
Inventor 鲍春伟梁斌车万里张学明王晶张立红朱卫东袁锦慧孙丽朋
Owner CHINA PETROLEUM & CHEM CORP
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