Polyolefin composite and preparation method thereof

A composition, polyolefin foaming technology, applied in the direction of coating, etc., can solve the problems involving less foam core layer composition and preparation method, poor fluidity, etc., and achieve the effect of increased melt viscosity and uniform and dense bubbles

Inactive Publication Date: 2017-05-31
FOSHAN RUIJIAN SPORTS EQUIP CO LTD
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  • Claims
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Problems solved by technology

The surface layer resins used in the two have the problem of poor fluidity in actual molding, and both rarely involve the composition of the foam core layer and its preparation method

Method used

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  • Polyolefin composite and preparation method thereof
  • Polyolefin composite and preparation method thereof

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Embodiment 1

[0045] Embodiment 1 polyolefin foaming composition, and is used for making rotomolding foamed article

[0046] a. Preparation of middle foam layer resin:

[0047] Ⅰ. Mixing: Put 100 parts by weight of linear low-density polyethylene (LLDPE) into a high-speed mixer that has been heated to 60°C in advance, start the high-speed mixer, and when the temperature of LLDPE rises to 60°C, add pre-mixed uniform cross-linked 0.5 parts by weight of foaming agent, 0.1 parts by weight of blowing agent, and 0.2 parts by weight of nucleating agent are mixed at 60°C for 5 minutes and then discharged, sealed and stored for granulation;

[0048] II Granulation: control the temperature at 10±2°C above the melting point of LLDPE, extrude and granulate, and store in a sealed container; it is used for grinding and screening;

[0049] Ⅲ Grinding and sieving: After grinding, sieve the powder with a particle size of 20-30 meshes for rotational molding;

[0050] b. Surface layer 1 resin preparation: ...

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Abstract

The invention provides a polyolefin composite and a preparation method thereof. (A) Middle foaming layer resin includes, by weight, 100 parts of linear low density polyethylene, 0-1.5 parts of a crosslinker, 0.05-1.5 parts of a foamer, and 0.1-2.0 parts of a nucleating agent; (B) surface resin includes, by weight: a first surface layer comprising 100 parts of linear low density polyethylene, and a second surface layer comprising, by weight, 100 parts of linear low density polyethylene, 1.0-1.5 parts of a crosslinker, and 2.0-3.5 parts of a lubricant. The invention also provides a one-step rotational molding process, by which a rotational molded foamed product has perfect appearance and excellent mechanical performance. The polyolefin composite has moderate flowability, is easy to process and is low in cost, and can be widely applied for production of plastic products.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyolefin foam composition and a preparation method thereof. Background technique [0002] Foamed products are composed of a dense and smooth surface layer and a core layer with light specific gravity and excellent mechanical properties. They have an aesthetic appearance and good practical performance, and have the characteristics of heat insulation and sound insulation. The market demand is growing rapidly. [0003] The rotational foam molding process has gone through the development process from multi-step method→two-step method→one-step method. As a special raw material composition matching with different processes, it is also continuously improved. Chinese patent CN 97195289.2 discloses a polymer with high zero-shear viscosity and a polymer with low zero-shear viscosity for the surface layer, which is physically dry-mixed with the foam core layer com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K13/02C08K5/134C08K5/526C08K5/14C08K3/26C08J9/10B29B9/06B29B9/16B29B13/10B32B27/32
CPCC08K13/02B29B9/06B29B9/16B29B13/10B32B27/32C08J9/103C08J2323/08C08K3/26C08K5/1345C08K5/14C08K5/526C08K2003/265C08L2203/14C08L23/0815
Inventor 邹明瑞
Owner FOSHAN RUIJIAN SPORTS EQUIP CO LTD
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