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Production process of foamed polyolefin wool with high hygroscopicity and air permeability

A technology of polyolefin foam and manufacturing method, which is applied in the field of manufacturing polyolefin foam with water absorption and air permeability, and can solve problems such as poor air permeability, non-connected cells, and limited shrinkage of the foam product range. , to achieve the effect of excellent air permeability

Inactive Publication Date: 2007-01-03
EVA GLORY INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned foaming system method is a commonly used and quite mature molding technology in the industry at present, but there are still deficiencies in the foamed products produced by it that cannot be solved. Traditionally, polyethylene vinyl acetate (EVA) or polyethylene (PE) is used as For the foamed body of the base material, many cells of different sizes are usually formed in the material structure after foaming. However, most of the cells are closed structures that are not connected to each other, resulting in poor water absorption of the foamed body. The water absorption efficiency is only about 0.1~0.2%, and because the structure of the cell structure is tight, the air inside and outside the foam cannot be effectively circulated and replaced, and the air permeability is poor, so the range of products that the foam can be applied to is greatly reduced

Method used

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  • Production process of foamed polyolefin wool with high hygroscopicity and air permeability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1). Mixing: At first, this embodiment uses polyethylene vinyl acetate (EVA) as the main base material, and utilizes balls, wood flour and surfactants as reaction materials, wherein the balls can be Aluminum silicate hollow beads, aluminum silicate solid beads, glass hollow beads or glass solid beads, aluminum silicate hollow beads are used in this embodiment, and then a predetermined proportion of substrate raw materials, reaction raw materials, bridging agent, foaming agent and All other processing aids are poured into a kneader and mixed evenly. The above-mentioned raw material components and weight ratios of the present embodiment are as follows:

[0013] Ethylene vinyl acetate (EVA): 73.1%

[0014] Aluminum silicate hollow beads: 7.3%

[0015] Wood flour: 11%

[0016] Surfactant: 2%

[0017] Bridging agent: 0.4%

[0018] Fine-core foaming agent: 3.2%

[0019] Coarse core foaming agent: 2.2%

[0020] Bridging aids: 0.3%

[0021] Zinc oxide powder: 0.5%

[00...

Embodiment 2

[0028] The base materials used in this embodiment are polyethylene vinyl acetate (EVA) and polyethylene (PE), and the following are the configurations of all raw material components and weight ratios.

[0029] Polyethylene vinyl acetate (EVA): 51.2%

[0030] Polyethylene (PE): 21.9%

[0031] Aluminum silicate hollow beads: 7.3%

[0032] Wood flour: 11%

[0033] Surfactant: 2%

[0034] Bridging agent: 0.4%

[0035] Fine-core foaming agent: 3.2%

[0036] Coarse core foaming agent: 2.2%

[0037] Bridging aids: 0.3%

[0038] Zinc oxide powder: 0.5%

Embodiment 3

[0040] The base materials used in this embodiment are polyethylene vinyl acetate (EVA) and ethylene-octene copolymer (POE) (or ethylene propylene rubber (IP)). The following are the configurations of all raw material components and weight ratios.

[0041] Polyethylene vinyl acetate (EVA): 58.5%

[0042] Ethylene-octene copolymer (POE): 14.6%

[0043] Aluminum silicate hollow beads: 7.3%

[0044] Wood flour: 11%

[0045] Surfactant: 2%

[0046] Bridging agent: 0.4%

[0047] Fine-core foaming agent: 3.2%

[0048] Coarse core foaming agent: 2.2%

[0049] Bridging aids: 0.3%

[0050] Zinc oxide powder: 0.5%

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Abstract

The production process of foamed polyolefin wool with high hygroscopicity and air permeability features that polyethylene vinyl acetate as basic material, hollow aluminum silicate bead, wood powder and interfacial active agent in certain weight proportion are mixed while adding bridging agent and foaming agent to form the mixture, the mixture is cut, and the cut mixture is hot pressed and foamed inside mold to form the foamed wool product with excellent hygroscopicity and air permeability.

Description

【Technical field】 [0001] The invention relates to a method for making foam, in particular to a method for making polyolefin foam with water absorption and air permeability by using polyethylene vinyl acetate (EVA) as the main raw material. 【Background technique】 [0002] Generally, polyethylene vinyl acetate (EVA) or polyethylene (PE) is used as the base material of the foam on the market. The traditional method is to beat the polyethylene vinyl acetate (EVA) or polyethylene (PE) pellets first. Until it is in a viscous liquid state, then add bridging agent, foaming agent and other processing aids in an appropriate proportion for mixing, and then press it into a sheet to make a primary embryo raw material, put the primary embryo raw material into the mold for hot pressing Molding, the raw material of the embryo will be made into a predetermined pattern of foaming according to the contained ingredient formula, and after a proper molding time, it can finally be made into a foam...

Claims

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Application Information

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IPC IPC(8): B29C44/02B29K33/04B29K23/00
Inventor 李文生
Owner EVA GLORY INDAL
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