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

An impact modifier, the technology of polyvinyl chloride, applied in the field of new core-shell structure polyvinyl chloride impact modifier and its preparation, can solve the problem of poor weather resistance and impact toughness of polyvinyl chloride resin, high production cost, Difficulty in granulation and other problems, to achieve the effect of increasing interfacial bonding force, good dissipation of impact energy, and high toughening efficiency

Inactive Publication Date: 2009-09-30
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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  • Method for preparing impact modifier of polyvinyl chloride in new type nuclear shell structure
  • Method for preparing impact modifier of polyvinyl chloride in new type nuclear shell structure
  • Method for preparing impact modifier of polyvinyl chloride in new type nuclear shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0061] (1) Preparation of polyacrylate composite latex

[0062] Add 200ml of deionized water, 0.50g of emulsifier sodium dodecyl sulfate (SDS) and a mixture of seed comonomer and crosslinking agent (14g BA, 3.5 g EHA, 0.2g BDDA), stir at room temperature and blow nitrogen gas to make it fully emulsified. Then start the water bath to heat up, and at the same time pass cooling water to the reflux condenser. When the system temperature reaches 64℃, start adding 0.2g of the initiator potassium persulfate (K 2 S 2 O 8 ), at the beginning of the reaction, the system exotherms and heats up. When the temperature of the reaction solution is constant to 75°C, the reaction is kept for 1 hour. Complete the synthesis of seed emulsion.

[0063] After the heat preservation reaction, add 0.5g SDS of the emulsifier required for the core layer to the system at one time, and add or dropwise add 0.4g K of the initiator for the core layer formula to the system after 15-20 minutes. 2 S 2 O 8 At the sam...

Embodiment 2

[0074] In the preparation process 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

[0076] In the preparation process 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

The invention relates to a preparation method of a polyvinyl chloride impact modifier with a core-shell structure. The method adopts acrylate monomer as the main raw material, and prepares a cross-linked polymer latex with an elastomer core-transition layer structure through seed emulsion polymerization in a semi-continuous feeding mode, and then, in the presence of the above-mentioned latex, adds Vinyl chloride monomer and its blend with other monomers are emulsion polymerized to prepare a core-shell structure polyvinyl chloride impact modifier with a transition layer structure. The modifier prepared by this method uses polyvinyl chloride as a thin shell, which greatly improves the compatibility between the modifier and the PVC resin matrix during blending, and effectively utilizes the polyacrylate elastomer core and functional functional groups. The characteristics of polyvinyl chloride can improve the notched impact resistance, weather resistance, and heat resistance stability of polyvinyl chloride materials, and the production cost of this method is lower than that of pure polyacrylate modifiers, which improves the added value of PVC resin and broadens the scope of polyvinyl chloride. Application field and application area of ​​vinyl chloride resin.

Description

[0001] Original case division: New 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 a preparation method and application thereof. Background technique [0003] Polyvinyl chloride (PVC), as the earliest bulk general plastic product developed and applied, is widely used in various fields due to its excellent rigidity, corrosion resistance, electrical insulation and other comprehensive properties and low price. Its output is in polymer materials. Occupies second place. However, PVC has disadvantages such as poor thermal stability and processability, and low notched impact strength. In order to overcome these shortcomings, people's research on PVC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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