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Raw material composition special for rotational molding foamed product, and preparation method and application method thereof

A technology of raw material composition and foamed products, applied in the direction of coating, etc., which can solve the problems of poor fluidity, less involved in the preparation and application methods of the composition of the foam core layer, etc.

Active Publication Date: 2011-04-20
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Raw material composition special for rotational molding foamed product, and preparation method and application method thereof
  • Raw material composition special for rotational molding foamed product, and preparation method and application method thereof
  • Raw material composition special for rotational molding foamed product, and preparation method and application method thereof

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Embodiment 1

[0048] Example 1 Preparation of a special raw material composition for rotationally molded foamed products, and for the manufacture of rotationally molded foamed products

[0049] a. Preparation of middle foam layer resin:

[0050] 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 the pre-mixed homogeneous 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;

[0051] 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;

[0052] III Grinding and sieving: After grinding, sieve the powder with a particle size of 20-30 m...

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Abstract

The invention discloses a raw material composition special for a rotational molding foamed product, and a preparation method and an application method thereof, and belongs to the composition comprising an organic high molecular compound as a basic material. The composition is characterized in that: a, an intermediate foamed layer resin comprises the following raw material components in part by weight: 100 parts of linear low-density polyethylene, 0 to 2.0 parts of cross-linking agent, 0.05 to 2.0 parts of foaming agent and 0.1 to 2.0 parts of nucleating agent; and b, a surface layer resin comprises the following raw material components: the surface layer 1 comprising 100 weight parts of the linear low-density polyethylene, and the surface layer 2 comprising 100 weight parts of the linear low-density polyethylene, 1.0 to 2.0 weight parts of cross-linking agent and 0 to 4.0 weight parts of lubricating agent. The invention provides the raw material composition special for the rotational molding foamed product, which is suitable for a one-step rotational molding process, endows the rotational molding foamed product with a perfect appearance and superior mechanical properties, has moderate fluidity, is low in cost and is easy to machine, and the preparation method and the application method thereof. The invention can be widely applied to machining of plastic products.

Description

technical field [0001] The invention is a special raw material composition for rotationally molded foamed products and a preparation and application method thereof. The invention belongs to a composition with an organic polymer compound as a base material, and in particular relates to a product-specific raw material composition composed of a foam polymer core and a polymer surface layer with a density greater than that of the core, and a preparation and application method thereof. Background technique [0002] Rotomolded 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....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K13/02C08K5/14C08K3/26C08K3/34C08K5/526C08K5/103C08J9/34B29B9/06B29B13/10B29C41/04B29C41/52
Inventor 刘少成张广明张丽霞于永玲裴晓静霍明
Owner CHINA PETROLEUM & CHEM CORP
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