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Cross-linked polyolefin foam material with high temperature resistance and preparation method thereof

A technology for cross-linked polyolefin and foam materials, which is applied in the field of cross-link polyolefin foam materials and their preparation, and can solve problems such as the influence of sealing and cushioning effects

Active Publication Date: 2020-12-01
HUBEI XIANGYUAN NEW MATERIAL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This change, generally shrinkage after cooling, will cause voids in the area originally filled with foam material, resulting in affected sealing and cushioning effects

Method used

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  • Cross-linked polyolefin foam material with high temperature resistance and preparation method thereof
  • Cross-linked polyolefin foam material with high temperature resistance and preparation method thereof
  • Cross-linked polyolefin foam material with high temperature resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The raw material of cross-linked polyolefin foam material 1 with high temperature resistance includes 60 parts of polyolefin resin, 18 parts of blowing agent, 4 parts of toughening agent, 3 parts of coupling agent and 3 parts by weight. parts of antioxidants;

[0050] Among them, the polyolefin resin is composed of ultra-low density polyethylene, medium density polyethylene, and ethylene-methyl acrylate copolymer, the ratio is 1:3:1, and the fastest crystallization rate temperature T_(c,max)≤100℃ The mass fraction of olefin resin accounting for polyolefin resin is 40%;

[0051] The method for preparing the above-mentioned cross-linked polyolefin foam material 1 with high temperature resistance comprises the following steps:

[0052] ① Weighing polyolefin, foaming agent, toughening agent, coupling agent and antioxidant according to the weight percentage;

[0053] ②Mix polyolefin, foaming agent, toughening agent, coupling agent and antioxidant;

[0054] ③The raw materi...

Embodiment 2

[0058] The raw material of the cross-linked polyolefin foam material 2 with high temperature resistance comprises 90 parts of polyolefin resin, 7 parts of foaming agent, 0.1 part of coupling agent and 0.4 part of antioxidant in parts by weight. ;

[0059] Wherein the polyolefin resin is low-density polyethylene, wherein the polyolefin resin with the fastest crystallization rate temperature T_(c,max)≤100°C accounts for 70% of the mass fraction of the polyolefin resin;

[0060] The method for preparing the above-mentioned cross-linked polyolefin foam material 2 with high temperature resistance comprises the following steps:

[0061] ① Weigh polyolefin, foaming agent, coupling agent and antioxidant according to the weight percentage

[0062] ②Mix polyolefin, foaming agent, coupling agent and antioxidant;

[0063] ③The raw materials mixed in step ② are melted and extruded into sheets;

[0064] ④ subjecting the sheet in step ③ to cross-linking treatment by high-energy electron i...

Embodiment 3

[0067] The raw material of the cross-linked polyolefin foam material 3 with high temperature resistance includes 75 parts of polyolefin resin, 4 parts of blowing agent, 0.1 part of toughening agent, 0.2 part of coupling agent and 0.7 part by weight. parts of antioxidants;

[0068] Among them, the polyolefin resin is composed of low-density polyethylene, metallocene polyethylene, linear low-density polyethylene, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, the ratio is 10:6:15:7:15, the most The mass fraction of polyolefin resin with fast crystallization rate temperature T_(c,max)≤100°C is 65%;

[0069] The method for preparing the above-mentioned cross-linked polyolefin foam material 3 with high temperature resistance comprises the following steps:

[0070] ① Weighing polyolefin, foaming agent, toughening agent, coupling agent and antioxidant according to the weight percentage; ② mixing polyolefin, foaming agent, toughening agent, coupling agent and antioxidan...

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Abstract

The invention discloses a high temperature resistant cross-linked polyolefin foamed material and a preparation method thereof. The raw materials include, by weight, 60-90 parts of polyolefin resin, 2-20 parts of a foaming agent and 0.1-10 parts of processing aids. Specifically, the polyolefin resin includes polyolefin resin with a maximum crystallization rate temperature T_(c, max) of lower than or equal to 100DEG C, and the polyolefin resin with the maximum crystallization rate temperature T_(c, max) of lower than or equal to 100DEG C accounts for more than or equal to 40% of the mass fraction of the polyolefin resin. The preparation method includes: mixing polyolefin, the foaming agent and the processing aids; performing melt extrusion into sheets; then subjecting the sheets to high-energy electron irradiation crosslinking treatment; and then heating the irradiated sheets, conducting foaming by a foaming furnace, then carrying out cooling shaping, and performing rolling-up. The cross-linked polyolefin foamed material provided by the invention increases the difference of temperature in a tensile zone and the crystallization temperature in the foaming process, and can increases thestarting temperature of heat shrinkage produce by the material and reduce the heat shrinkage rate.

Description

technical field [0001] The invention relates to a high-temperature and low-shrinkage foaming material, in particular to a high-temperature-resistant cross-linked polyolefin foaming material and a preparation method thereof. Background technique [0002] Polyolefin foam technology includes three types: [0003] 1) Adopt the extrusion foaming process that uses low-boiling point substances as foaming agents to extrude and directly foam through an extruder; [0004] 2) After oxide crosslinking, the gas generated by the chemical foaming agent expands the polyolefin in the melt state during the high temperature pressure relief process; [0005] 3) After the polyolefin is cross-linked by peroxide or high-energy rays, the cross-linking normal pressure free foaming process is carried out in a foaming furnace. [0006] The properties of the products produced by the three different foaming processes and technologies have their own characteristics: the appearance of the extruded foame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/08C08J9/04C08J3/28C08J3/24
CPCC08J3/246C08J3/28C08J9/0061C08J9/04C08J2323/06C08J2323/08C08J2423/06C08J2423/08
Inventor 段建平魏琼
Owner HUBEI XIANGYUAN NEW MATERIAL TECH INC
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