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Preparation method of impact-resistant PVC (polyvinyl chloride)

A technology of polyvinyl chloride and seeds, applied in the field of preparation of polyvinyl chloride, can solve the problems of unexplained or stated styrene-butadiene rubber latex, degradation of outdoor aging performance of impact-resistant PVC, etc., so as to improve compatibility and bonding force, increase The effect of improving toughness and reducing equipment investment

Inactive Publication Date: 2015-07-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that there are many graftable points of vinyl chloride monomer, and the emulsion polymer is a soft particle with strong hydrophobicity. Therefore, when the system is subjected to suspension polymerization, the vinyl chloride monomer is first enriched on the surface of the emulsion particle, but due to the use of The molecular chain of styrene-butadiene rubber contains double bonds, so the outdoor aging performance of the obtained impact-resistant PVC is greatly reduced. The patent also does not clarify or state the influence of styrene-butadiene rubber emulsion on the suspension polymerization process of vinyl chloride, including the size of the foam, the PVC Particle shape, sticking condition, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The specific steps of the preparation method of impact polyvinyl chloride are as follows:

[0021] In parts by mass: add 5000 parts of deionized water, 600 parts of core-shell emulsion, 3.5 parts of L-10 and 1.6 parts of GH-20 of dispersant and 1.0 parts of initiator CNP and 1.4 parts of EHP into the autoclave, and then add 3 parts of sodium bicarbonate, after removing the air, add 2500 parts of vinyl chloride monomer and stir to heat up the reaction, the polymerization temperature is controlled at 56.5±0.5°C; when the pressure in the reactor drops by 0.2-0.3MPa, quickly cool down, terminate the reaction, and eliminate unreacted After the vinyl chloride monomer is obtained, the material is discharged, centrifugally filtered, washed, and air-dried to obtain impact-resistant polyvinyl chloride powder.

[0022] The preparation of described core-shell type emulsion:

[0023](1) Preparation of core copolymer emulsion: in parts by mass, 350 parts of deionized water, 815 part...

Embodiment 2

[0026] The specific steps of the preparation method of impact polyvinyl chloride are as follows:

[0027] In parts by mass: add 5000 parts of deionized water, 600 parts of core-shell emulsion, 3.5 parts of L-10 and 1.6 parts of GH-20 of dispersant and 1.0 parts of initiator CNP and 1.4 parts of EHP into the autoclave, and then add 3 parts of sodium bicarbonate, after removing the air, add 2500 parts of vinyl chloride monomer and stir to heat up the reaction, the polymerization temperature is controlled at 56.5±0.5°C; when the pressure in the reactor drops by 0.2-0.3MPa, quickly cool down, terminate the reaction, and eliminate unreacted After the vinyl chloride monomer is obtained, the material is discharged, centrifugally filtered, washed, and air-dried to obtain impact-resistant polyvinyl chloride powder.

[0028] The preparation of described core-shell type emulsion:

[0029] (1) Preparation of core copolymer emulsion: in parts by mass, 350 parts of deionized water, 815 par...

Embodiment 3

[0032] The specific steps of the preparation method of impact polyvinyl chloride are as follows:

[0033] In parts by mass: add 5000 parts of deionized water, 600 parts of core-shell emulsion, 3.5 parts of L-10 and 1.6 parts of GH-20 of dispersant and 1.0 parts of initiator CNP and 1.4 parts of EHP into the autoclave, and then add 3 parts of sodium bicarbonate, after removing the air, add 2500 parts of vinyl chloride monomer and stir to heat up the reaction, the polymerization temperature is controlled at 56.5±0.5°C; when the pressure in the reactor drops by 0.2-0.3MPa, quickly cool down, terminate the reaction, and eliminate unreacted After the vinyl chloride monomer is obtained, the material is discharged, centrifugally filtered, washed, and air-dried to obtain impact-resistant polyvinyl chloride powder.

[0034] The preparation of described core-shell type emulsion:

[0035] (1) Preparation of core copolymer emulsion: in parts by mass, 350 parts of deionized water, 733 par...

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Abstract

The invention discloses a method for preparing PVC (polyvinyl chloride) resin which is good in impact resistance and high in heat-deformation-resistant temperature from a core-shell type acrylate emulsion through suspension polymerization. The method comprises steps as follows: the core-shell type emulsion is prepared with a two-step seed emulsion polymerization technology, the core is a copolymer which is high in crosslinking, high in hydrophobic property and low in glass-transition temperature, the shell layer is a copolymer which is high in hydrophobic property, low in crosslinking and high in glass-transition temperature, and the core-shell type emulsion is added to a suspension polymerization system for vinyl chloride suspension polymerization. The method eliminates the phenomena of kettle adhesion and coarse particles when the emulsion is added for vinyl chloride suspension polymerization at present and solves the problem of large foam during discharging, and suspension polymerization of the next batch of vinyl chloride can be performed without kettle cleaning. Through chemical modification, vinyl chloride monomers are polymerized on surfaces of emulsion particles, the compatibility and the binding force between rubber and plastic are increased, and the toughening effect is greatly improved. The designability of the emulsion adopting the core-shell structure is realized, and the heat-deformation-resistant temperature and the ultraviolet-aging-resistant performance of PVC can be further improved.

Description

Technical field: [0001] The invention belongs to the technical field of polyvinyl chloride preparation, and particularly relates to a method for preparing polyvinyl chloride resin with good impact resistance and high heat-resistant deformation temperature by adopting core-shell type acrylate emulsion suspension polymerization. Background technique: [0002] Polyvinyl chloride (PVC) resin has become the second largest production in the world after polyethylene because of its low price, simple production process, excellent mechanical properties, excellent chemical resistance and unique flame retardancy. Plastic resin products. However, the molecular structure of PVC also determines its inherent defects, such as (1) poor processing performance: the melt is easily broken during processing, and the appearance of the product is poor; (2) impact resistance is poor, and the notched impact strength of rigid PVC is only 2-5kJ / m 2 ; (3) The plastic temperature is the lowest among al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/04C08F214/06C08L51/00C08L27/06
Inventor 夏宇正赵秋颖石淑先
Owner BEIJING UNIV OF CHEM TECH