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Foamed polyolefin composition and polyolefin foamed material, preparation method of foamed polyolefin composition as well as product prepared by adopting foamed polyolefin composition

A technology for foaming polyolefin and composition, applied in the field of polyolefin foam materials, can solve the problems of poor fluidity, low foaming ratio, etc., and achieve the effects of increasing selectivity, high foaming ratio, and widening the processing operation window.

Active Publication Date: 2014-07-30
神华(北京)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the relatively poor fluidity of the foamed polyolefin composition of the prior art and the defects such as the relatively low expansion ratio of the foamed polyolefin composition although the foamed polyolefin composition has a high degree of crosslinking, and provides a Foamed polyolefin composition with high fluidity, high degree of crosslinking and high expansion ratio, polyolefin foam material prepared from the foamed polyolefin composition, preparation method thereof, and products prepared from the foamed polyolefin composition

Method used

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  • Foamed polyolefin composition and polyolefin foamed material, preparation method of foamed polyolefin composition as well as product prepared by adopting foamed polyolefin composition
  • Foamed polyolefin composition and polyolefin foamed material, preparation method of foamed polyolefin composition as well as product prepared by adopting foamed polyolefin composition
  • Foamed polyolefin composition and polyolefin foamed material, preparation method of foamed polyolefin composition as well as product prepared by adopting foamed polyolefin composition

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Effect test

preparation example Construction

[0037] The present invention also provides the preparation method of above-mentioned polyolefin foam material, and this method comprises the following steps:

[0038] 1) Add the foamed polyolefin composition containing polyolefin resin, cross-linking agent system and organic chemical foaming agent system into a mixer and stir until uniformly mixed. The cross-linking agent system is at least two kinds of organic peroxide A mixture of coupling agents, wherein the melting point T of the polyolefin resin a , the decomposition temperature T of the organic chemical blowing agent system b , the typical crosslinking temperature T of at least two organic peroxide crosslinking agents in the crosslinking agent system c1 and T c2 The relation satisfies: T a c1 b c2 ;

[0039] 2) Melt blending the foamed polyolefin mixture obtained in step 1), and its operating temperature T 0 Meet: T a 0 c1 ;

[0040] 3) Gradually heat the blend obtained in step 2) until the operating temperature T...

Embodiment 1

[0074] Replace the crosslinking agent 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne (DYBP) in Comparative Example 1 with 2,5-dimethyl-2,5- A crosslinking agent system composed of a mixture of di-tert-butylperoxy-3-hexyne (DYBP) and dicumyl peroxide (DCP), and the weight ratio of the two is 3:1, and the other compositions and ratios remain unchanged Repeat the experiment.

[0075] Among them, the melting point Ta of polyethylene (LH3750) is 124°C, the melt index is 5g / 10min (2.16kg / 10min), the decomposition temperature Tb of the organic chemical foaming agent system is 180°C, and the crosslinking agent dicumyl peroxide (DCP) typical crosslinking temperature T c2 The typical crosslinking temperature T of the crosslinking agent 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne (DYBP) is 185°C c1 is 170°C.

[0076] The formula is based on the base resin (polyethylene LH3750) as 500 parts by weight, see Table 2;

[0077] The performance test results of polyolefin foam materials are...

Embodiment 2

[0081] Replace the crosslinking agent 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne (DYBP) in Comparative Example 3 with 2,5-dimethyl-2,5- A crosslinking agent system composed of a mixture of di-tert-butylperoxy-3-hexyne (DYBP) and dicumyl peroxide (DCP), and the weight ratio of the two is 1:1, and the other compositions and ratios remain unchanged Repeat the experiment.

[0082] The formula is shown in Table 2 based on 500 parts by weight of the matrix resin;

[0083] The performance test results of polyolefin foam materials are shown in Table 3.

[0084] From the foamed polyolefin composition (the foamed polyolefin composition contains linear low density polyethylene, 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne (DYBP) The cross-linking agent system composed of a mixture of dicumyl peroxide (DCP) and the organic chemical foaming agent azodicarbonamide (AC)) can be used for filling automobile bodies, incubators, yachts and large seafood transport etc.

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Abstract

The invention relates to a foamed polyolefin composition and a polyolefin foamed material, a preparation method of the foamed polyolefin composition and a product prepared by adopting the polyolefin foamed material. The foamed polyolefin composition contains polyolefin resin, a crosslinking agent system and an organic chemical foaming agent system, wherein the crosslinking agent system is a mixture of at least two organic peroxide crosslinking agents, and relationships among a melting point Ta of polyolefin resin, a decomposition temperature Tb of the organic chemical foaming agent system and typical crosslinking temperatures Tc1 and Tc2 of at least two organic peroxide crosslinking agents in the crosslinking agent system satisfies the relationship: Ta<Tc1<Tb<Tc2. Selection of the polyolefin resin in the foamed polyolefin composition provided by the invention is not limited to high melt strength polyethylene, selectivity of foamed resin is enhanced, and industrial production is facilitated; meanwhile, the prepared foamed polyolefin composition also has high crosslinking degree and high foaming ratio and is especially applicable to high-end products for automotive body filling, an incubator, a yacht, large-scale seafood and the like.

Description

technical field [0001] The invention belongs to the field of foamed polymers, specifically, the present invention relates to a foamed polyolefin composition, a polyolefin foam material prepared from the foamed polyolefin composition, a preparation method of the polyolefin foam material, and Articles prepared from the foamed polyolefin composition. Background technique [0002] Foamed polyolefin resins require higher melt strength, and resins with higher melt strength have poor processing fluidity, especially for injection molding, casting and rotational molding. Therefore, in the industry, micro-crosslinking or slight crosslinking is often used to control foaming (US Patent 4,554,293), mainly because the micro-crosslinking reaction provides a certain melt strength for the foaming resin, prevents the diffusion of bubbles, and avoids the interaction of bubbles. Close to form an open hole and string hole structure. [0003] On the other hand, for foamed polyethylene products,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08K13/02C08K5/14C08K3/22C08J9/10
CPCC08J3/24C08J9/103C08J2203/04C08J2323/06C08J2323/08C08K5/14C08K2201/014C08L2203/14C08L2207/062C08L23/06C08L23/0815
Inventor 陈学连梁文斌赖世耀
Owner 神华(北京)新材料科技有限公司
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