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Method for preparing impact modifier of polyvinyl chloride in new type structure of hud

An impact modifier, the technology of polyvinyl chloride, applied in the new core-shell structure polyvinyl chloride impact modifier and its preparation field, can solve the problem of poor heat resistance and thermal stability, modifier and modified matrix Poor compatibility and interfacial adhesion, uneven particle dispersion, etc.

Inactive Publication Date: 2007-02-21
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Preparation of polyacrylate composite latex

[0062] 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.

[0063] 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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PUM

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Abstract

This invention relates to a method for preparing polyvinyl chloride impact modifier with core / shell structure. The method comprises: utilizing acrylate monomer as the raw material, performing seed emulsion polymerization by semi-continuous adding the raw material to obtain crosslinked polymer latex with elastomer core / transition layer structure, adding vinyl chloride monomer and other monomers into the high-pressure kettle, and performing emulsion polymerization to obtain polyvinyl chloride impact modifier with core / shell structure. The impact modifier has polyvinyl chloride as the shell, thus can improve the compatibility with polyvinyl chloride resin matrix when blending, and effectively exert the functions of polyacrylate elastomer core and functional groups. The impact modifier can improve the impact property, weathering resistance and heat stability of polyvinyl chloride materials. Besides, the cost of the impact modifier is lower than that of polyacrylate impact modifier, thus can increase the added value of polyvinyl chloride resin and broaden the applications of polyvinyl chloride resin.

Description

[0001] Divisional original case: Novel core-shell structure polyvinyl chloride impact modifier and its preparation method and application, application number 200510015287.6, application date September 29, 2005) technical field [0002] 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 [0003] 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 be...

Claims

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Application Information

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IPC IPC(8): C08F265/06C08F2/38C08F2/26C08L27/06
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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