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Cross-linked polyolefin composition for rotational molding and preparation method thereof

A technology of cross-linking polyolefin and composition, applied in the direction of coating, etc., can solve the problems of easy generation of air bubbles, poor product hardness, lower density, etc., and achieve the effect of reducing product air bubbles, good plasticization, and easy demoulding

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent CN1523052A "Special material for cross-linked polyethylene for rotational molding" is similar to CN1524899A "Special material for cross-linked polyethylene for rotational molding and its preparation method". LDPE, cross-linking agent, antioxidant, but due to the relatively low density of raw materials LLDPE and LDPE, the density will be further reduced after cross-linking, which will make the molded product have poor hardness, easy warping, and rotational molding There are disadvantages such as easy generation of air bubbles and poor fluidity during processing

Method used

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  • Cross-linked polyolefin composition for rotational molding and preparation method thereof
  • Cross-linked polyolefin composition for rotational molding and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1～8

[0034] Raw materials used:

[0035] Linear Low Density Polyethylene 1 (LLD1): Melt mass flow rate (190°C, 2.16kg) is 6g / 10min, density 0.938g / cm 3

[0036] Linear low density polyethylene 2 (LLD2): Melt mass flow rate (190°C, 2.16kg) is 4g / 10min, density 0.936g / cm 3

[0037] High-density polyethylene 1 (HD1): Melt mass flow rate (190°C, 2.16kg) is 6.5g / 10min, density 0.954g / cm 3

[0038] High-density polyethylene 2 (HD2): Melt mass flow rate (190°C, 2.16kg) is 7.5g / 10min, density 0.958g / cm 3

[0039] Cross-linking agent: dicumyl peroxide (DCP) or 2,5-dimethyl-2,5-di-tert-butylperoxyhexane

[0040] Nucleating agent: 2000 mesh calcium carbonate (CaCO 3 ) or 2500 mesh calcium sulfate (CaSO 3 )

[0041] Lubricants: zinc stearate (ZnSt) or calcium stearate

Embodiment

[0042] Embodiment preparation technology:

[0043] The various raw materials of component A are mixed according to the proportion and then granulated. The mixing speed is 1000 rpm, the mixing temperature is 25°C, and the mixing time is 4 minutes. Single-screw extruder or twin-screw extruder is used. Granulate at a temperature of 130-170° C., and then grind into fine powder. Examples 1-4 are ground into 35-mesh fine powder. Embodiment 5-Example 8 are ground into 45-mesh fine powder. Comparative Example 1 is ground into 35-mesh fine powder. Fine powder, Comparative Example 2 was ground into 45 mesh fine powder.

[0044] Grind high-density polyethylene 1 and high-density polyethylene 2 directly into powder, as component B, grind into 20-mesh fine powder in Example 1-Example 4, and grind into 30-mesh fine powder in Example 5-Example 8 .

[0045] Mix the grinding powder of component A and the grinding powder of component B according to the proportion for rotomolding. When the tem...

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Abstract

The invention relates to a cross-linked polyolefin composition for rotational molding and a preparation method thereof, belonging to the field of cross-linked polyolefin composition for rotational molding. The cross-linked polyolefin composition comprises a component A and a component B, wherein the component A comprises 100 weight parts of linear low density polyethylene (LLDPE), 50-100 weight parts of high density polyethylene (HDPE), 2-5 weight parts of cross-linking agent, 0.2-1.0 weight parts of nucleating agent, and 0.2-1.0 weight parts of lubricant; and the component B is high density polyethylene, and the ratio of the component A to the component B is 90:10-95:5. According to the invention, optimum crosslinking degree is achieved and high hardness and difficulty in warpage are guaranteed by selecting the basic resin, and the addition of the nucleating agent is beneficial for reducing product bubbles; products produced by using the composition of the invention has smooth internal and external surface, easiness in mold stripping, high crosslinking degree, and good comprehensive properties.

Description

technical field [0001] The invention relates to a crosslinked polyolefin composition for rotational molding and a preparation method thereof, belonging to the field of crosslinked polyolefin compositions for rotational molding. Background technique [0002] Cross-linked polyethylene for rotomolding can be cross-linked during the molding process to form a network structure, so that the product has superior impact strength, heat creep resistance and low temperature toughness, good impermeability, chemical resistance, softening The temperature can reach 200°C, and it can be used for a long time at 140°C. [0003] In the domestic market, polyethylene (PE) accounts for about 75% of the raw materials used in rotomolding products, of which 95% is rotomolding-grade LLDPE that is very suitable for rotomolding, while the proportion of foreign rotomolding PE materials is roughly: LLDPE It is 65%, XPE (cross-linked polyethylene) is 20%, HDPE is 10%, and LDPE is 5%. [0004] The patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K13/02C08K5/14C08K3/26C08K3/34C08K3/30C08J3/24B29C47/92B29C41/52B29B9/06B29C48/92
CPCB29C48/04B29C48/397B29C48/40B29C48/92B29C2948/92704B29C2948/92895
Inventor 刘少成张超张广明霍明胡军徐素兰孙丽朋裴小静
Owner CHINA PETROLEUM & CHEM CORP
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