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Suspension polymerization method for reducing polyvinyl chloride resin fisheyes

A polyvinyl chloride resin, suspension polymerization technology, applied in the field of polymer polymerization, can solve the problem of few fish eyes, etc., achieve the effect of improving aging whiteness, strong operability, and reducing the number of fish eyes

Active Publication Date: 2014-12-10
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a suspension polymerization method for reducing polyvinyl chloride resin fish eyes, improve the internal structure of the resin, to overcome the current defect of reducing fish eyes by increasing the plasticizing temperature during processing, Obtain a kind of polyvinyl chloride resin with few fish eyes and good aging whiteness

Method used

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  • Suspension polymerization method for reducing polyvinyl chloride resin fisheyes
  • Suspension polymerization method for reducing polyvinyl chloride resin fisheyes

Examples

Experimental program
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Effect test

Embodiment 10

[0041] Example 10 and Example 11 are for investigating the effect of stabilizers on aging whiteness. No anti-fish-eye agent is added. When the anti-fish-eye agent is used, the anti-fish-eye agent is formulated into an ethanol solution with a mass concentration of 10%.

Embodiment 1

[0043] Rinse the polymerizer, apply anti-sticking agent and rinse, then vacuum, and suck in 140 parts of deionized water and composite dispersant (polyvinyl alcohol: hydroxypropyl methyl cellulose = 10: 1) 0.15 parts, composite initiator (cumyl peroxyneoheptanoate: dicyclohexyl peroxydicarbonate = 1:3) 0.10 parts, anti-fisheye agent (tert-butyl hydroquinone) 0.001 parts , 0.1 part of stabilizer (octadecyl alcohol), then vacuum to -0.098MPa, add 100 parts of vinyl chloride monomer of formula, cold stir for 10 minutes, heat up to reaction temperature 58.5℃ and start timing, polymerization pressure is 0.90MPa, When the polymerization temperature is maintained until the polymerization pressure drops by 0.10 MPa, 0.02 part of diethylhydroxylamine is added to terminate the reaction, the monomer is recovered and the material is discharged, and the PVC resin is obtained after centrifugal drying. The test results obtained in this example are shown in Table 1.

Embodiment 2

[0045] Rinse the polymerizer, apply anti-sticking agent and rinse, then vacuum, and suck in 140 parts of deionized water and composite dispersant (polyvinyl alcohol: hydroxypropyl methyl cellulose = 10: 1) 0.15 parts, composite initiator (cumyl peroxyneoheptanoate: dicyclohexyl peroxydicarbonate = 1:1) 0.10 parts, anti-fish eye agent (tert-butyl-4-hydroxyanisole) ) 0.001 part, 0.1 part of stabilizer (octadecyl alcohol), then vacuumize to -0.098MPa, add 100 parts of formula amount of vinyl chloride monomer, cold stir for 10 minutes, heat up to reaction temperature of 58.5℃ and start timing, polymerization pressure is 0.90MPa, when the polymerization temperature is maintained until the polymerization pressure drops by 0.10MPa, 0.02 part of diethylhydroxylamine is added to terminate the reaction, the monomer is recovered and the material is discharged, and the PVC resin is obtained after centrifugal drying. The test results obtained in this example are shown in Table 1.

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Abstract

The invention belongs to the field of high polymer polymerization, and particularly relates to a suspension polymerization method for reducing polyvinyl chloride resin fisheyes, which comprises the following steps: adding deionized water, vinyl chloride monomer, a composite dispersant, a fisheye inhibitor, a composite initiator a stabilizer into a polymerization kettle to carry out polymerization reaction, wherein the polymerization pressure is 0.80-1.20 MPa, and the polymerization reaction temperature is 50-65 DEG C; and when the polymerization pressure drops to 0.05-0.10 MPa, adding a reaction terminator, and discharging the residual vinyl chloride monomer. The polyvinyl chloride resin prepared by the method provided by the invention reduces the number of fisheyes in the polyvinyl chloride resin, enhances the aging whiteness of the resin, and has the advantages of strong operability and no adverse effect on polymerization reaction.

Description

Technical field [0001] The invention belongs to the field of polymer polymerization, and particularly relates to a suspension polymerization method for reducing fish eyes of polyvinyl chloride resin. Background technique [0002] With the rapid development of polyvinyl chloride (PVC) production and processing technology, higher requirements are put forward for the quality and specificity of PVC resin. If there are fish eyes on the product, it will not only seriously affect the aesthetics of the product surface, but also reduce the mechanical properties of the product such as tensile strength and elongation. It is easy to cause perforation of the plastic film and sheet. For cable products, it will give its electrical properties. , Low-temperature flexural performance brings great harm, if it falls off, it will also cause electrical breakdown accidents. The fisheye in the quality index of the suspension method PVC product usually refers to the "lumps" and "brightness" formed on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/06C08F2/20C08L27/06C08K5/13
Inventor 车万里于永玲李留忠王晶朱卫东张立红张磊梁斌鲍春伟孔秀丽李静郭卫东张勇袁锦慧
Owner CHINA PETROLEUM & CHEM CORP
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