Nucleocapsid structure polyvinyl chloride impact modifier, and its preparing method and use

An impact modifier, polyvinyl chloride technology, applied in the field of new core-shell structure polyvinyl chloride impact modifier and its preparation, can solve the difficulty of granulation, easy agglomeration and agglomeration, high production cost, etc. question

Inactive Publication Date: 2009-02-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] With regard to the problems mentioned above, the polyacrylate / polyvinyl chloride impact modifier prepared by the present invention attempts to solve the difficulty of granulation when directly demulsifying by pure polyacrylate rubber latex, and the problems of agglomeration and coagulation are prone to occur. ; Inhomogeneous dispersion of particles in the matrix resin during the blending process; poor compatibility and interfacial adhesion between the modifier and the modified matrix; poor weather resistance and impact toughness of general-purpose polyvinyl chloride resin , poor heat resistance and thermal stability, and the high production cost of traditional ACR modifiers

Method used

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  • Nucleocapsid structure polyvinyl chloride impact modifier, and its preparing method and use
  • Nucleocapsid structure polyvinyl chloride impact modifier, and its preparing method and use
  • Nucleocapsid structure polyvinyl chloride impact modifier, and its preparing method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0060] (1) Preparation of polyacrylate composite latex

[0061] Add 200ml deionized water, 0.50g emulsifier sodium dodecyl sulfate (SDS) and the mixed solution (14g BA, 3.5 g EHA, 0.2g BDDA), stirring at room temperature and blowing nitrogen to make it fully emulsified. Then start the water bath to heat up, and feed the cooling water to the reflux condenser simultaneously. When the system temperature reached 64°C, start to add 0.2g initiator potassium persulfate (K 2 S 2 o 8 ), when the reaction starts, the system exotherms and heats up. When the temperature of the reaction liquid was constant to 75°C, the reaction was kept for 1 hour. Complete the synthesis of the seed emulsion.

[0062] After the heat preservation reaction, add 0.5 g of the emulsifier required for the core layer to the system at one time. After 15 to 20 minutes, add or dropwise add 0.4 g of the initiator of the core layer formula to the system. 2 S 2 o 8 At the same time, the mixed solution of the c...

Embodiment 2

[0073] During the preparation of the composite latex (1), the crosslinking agent was changed to allyl methacrylate (ALMA), and the rest of the formula and operation were the same as in Example 1.

Embodiment 3

[0075] During the preparation of the composite latex (1), the crosslinking agent was changed to dicyclopentenyl acrylate (DCPA), and the rest of the formula and operation were the same as in Example 1.

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Abstract

This invention relates to a PVC impact modifier with new-type nucleocapsid structure and its preparing method and application.It comprises: using acrylic monomer as main material, making cross-linked polymer latex with pure nucleus or nucleocapsid structure by semi-continuously charging mode of seed emulsion polymerization, then in the presence of said latex, adding chloroethene monomer to autoclave to emulsion polymerization, so as to obtain polyacrylate / PVC composite particle modifier with nucleocapsid structure.Because said modifier uses directly PVC as shell, it improves greatly compatibility between modifier and PVC resin matrix at crossblending, increasing two-phase bonding force, effectively giving play to characteristics of polyacrylate elastomer kernel so as to increase PVC material notch impact property, weathering-heating resistance and thermal stability, making general resin have high performance and functionization. It has low production cost, high added value of PVC resin, and widens PVC resin application.

Description

technical field [0001] The invention belongs to a preparation method of a general-purpose polyvinyl chloride resin impact modifier, in particular to a novel core-shell structure polyvinyl chloride impact modifier and its preparation method and application. Background technique [0002] Polyvinyl chloride (PVC), as the earliest development and application of bulk general-purpose plastics, is widely used in various fields because of its excellent rigidity, corrosion resistance, electrical insulation and other comprehensive properties and low price. occupies the second place. However, PVC has disadvantages such as poor thermal stability and processability, and low notched impact strength. In order to overcome these shortcomings, the research on PVC modification has been going on for a long time. The currently used modification methods are mainly (graft) copolymerization chemical modification and mechanical blending physical modification. The blending method is favored by peop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/08C08L27/06C08F2/44C08F2/22
Inventor 潘明旺邢胜男袁金凤张晓蕾张留成
Owner HEBEI UNIV OF TECH
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