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Radiation crosslinked polyethylene foam and preparation method and application thereof

A polyethylene foam and radiation cross-linking technology, which is applied in the field of radiation cross-linked polyethylene foam and its preparation, can solve the problem that the expansion ratio of IXPE foam cannot exceed 45B, limit the application range of IXPE foam, and the appearance of foam Roughness and other problems, to achieve the effect of increasing the limit expansion ratio, reducing the temperature of granulation and extrusion, and reducing the density

Inactive Publication Date: 2019-01-11
SHENZHEN CHANGYUAN TEFA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the three types of foam, EPE is the most developed, directly extruded from PE raw material and physically foamed, but the foam obtained by this method is extremely rough in appearance and poor in performance
[0004] However, at present, most of the IXPE foam foamed by irradiation crosslinking cannot exceed 45B, which limits the application range of IXPE foam to a large extent.

Method used

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  • Radiation crosslinked polyethylene foam and preparation method and application thereof
  • Radiation crosslinked polyethylene foam and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment approach

[0076] As a preferred embodiment of the present invention, the melt index of the low-density polyethylene is 4.0-5.0g / 10min.

[0077] In a preferred embodiment of the present invention, by rationally adjusting the melt index of low-density polyethylene, the system has more suitable processing fluidity.

[0078] As a preferred embodiment of the present invention, the low density polyethylene has a melting point of 100-110°C. Using low-density polyethylene with low melting point and high melt index as the matrix can reduce the processing temperature for preparing radiation crosslinked polyethylene foam and further reduce the decomposition of blowing agent.

[0079] As a preferred embodiment of the present invention, the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 5%-10%, and the typical but non-limiting vinyl acetate content in the ethylene-vinyl acetate copolymer is 5%, 6%, 7%, 7.5%, 8%, 9% or 10%; preferably, the melt index of the ethylene-vinyl acetat...

Embodiment 1

[0141] 1. Radiation cross-linked polyethylene foam

[0142] A radiation cross-linked polyethylene foam is mainly prepared from the following raw materials in parts by weight:

[0143] 68 parts of low-density polyethylene, 9 parts of ethylene-vinyl acetate copolymer, 20 parts of azodicarbonamide, 1 part of foaming aid, and 1.1 parts of antioxidant.

[0144] Among them, the grade of low-density polyethylene is Qatar 0474, the melting point is 105°C, and the melt index is 4.0g / 10min.

[0145] The trade mark of ethylene-vinyl acetate copolymer is EVA 14-2, and the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 8%, and melt index is 2g / 10min.

[0146] The grade of azodicarbonamide is Korea Dongjin DF1500. The shape is spherical, the particle size is 13nm, and the decomposition temperature is 205-215°C.

[0147] The foaming aid is composed of ZnO and ZnSt; the weight ratio of ZnO and ZnSt is 2:1.

[0148] The antioxidant consists of DSTP and 1010; the weight...

Embodiment 2

[0163] 1. Radiation cross-linked polyethylene foam

[0164] A radiation cross-linked polyethylene foam is mainly prepared from the following raw materials in parts by weight:

[0165] 55 parts of low-density polyethylene, 3 parts of ethylene-vinyl acetate copolymer, 25 parts of azodicarbonamide, 0.3 parts of foaming aid, and 2 parts of antioxidant.

[0166] Wherein, each raw material is identical with embodiment 1.

[0167] 2. Preparation of radiation cross-linked polyethylene foam

[0168] Mix azodicarbonamide, antioxidant and LDPE according to the weight ratio of 25:2:35 to obtain the azodicarbonamide masterbatch containing antioxidant. Mix the foaming aid and LDPE according to the weight ratio of 0.3:5 to obtain the foaming aid masterbatch.

[0169] The preparation process of radiation cross-linked polyethylene foam is the same as that of Example 1.

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Abstract

The invention provides radiation crosslinked polyethylene foam and a preparation method and an application thereof and belongs to the technical field of high molecular materials. The radiation crosslinked polyethylene foam is primarily prepared from the following raw materials in parts by weight: 55-81.5 parts of low density polyethylene, 3-15 parts of an ethylene-vinyl acetate copolymer, 17-25 parts of a foamer, 0.3-3 parts of a foaming auxiliary agent and 0.2-2 parts of an antioxidant. The melt index of the low density polyethylene is 3.0-6.0 g / 10 minutes. The temperature in the preparationprocess can be reduced greatly as a result of relatively good flowability of the low density polyethylene and decomposition of the foamer is reduced effectively, so that the use level of the foamer can be further improved, and therefore, the extreme foaming rate of the foam is improved and the foam density is reduced to obtain the radiation crosslinked polyethylene foam which is light in weight and flexible. The radiation crosslinked polyethylene foam can be better applied to fields which have higher demands on the foaming rate.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a radiation-crosslinked polyethylene foam and its preparation method and application. Background technique [0002] Foam is a material made of foamed plastic particles. Foam has a series of characteristics such as elasticity, light weight, fast pressure-sensitive fixation, convenient use, free bending, ultra-thin volume, and reliable performance. [0003] The foam material prepared by foaming with PE as the main raw material is called PE foam. At present, PE foam can be divided into three types due to different processing methods, EPE, XPE and IXPE. Among the three kinds of foams, EPE is the most developed, directly extruded and physically foamed by PE raw materials, but the foam obtained by this method is extremely rough in appearance and poor in performance. XPE is a foam that is foamed after adding chemical cross-linking agents to produce chemical cross-linking. Th...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08J9/10C08J3/28
CPCC08J3/28C08J9/0061C08J9/103C08J2203/04C08J2323/06C08J2423/08
Inventor 卓智华王明蕉范宇雷以纯
Owner SHENZHEN CHANGYUAN TEFA TECH CO LTD
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