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Modified EVA microporous elastomer composite material and preparation method thereof

A technology of microcellular elastomers and composite materials, applied in the field of elastomer composite materials, can solve the problems of inability to meet the use in special fields, poor uniformity of material cells, low tensile strength of EVA microcellular elastomers, etc., and achieves easy operation. , the effect of improved tensile modulus and simple preparation method

Inactive Publication Date: 2009-10-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tensile strength of the EVA microcellular elastomer prepared by the above method is low, and the uniformity of the material cells is poor, which cannot meet the needs of special fields.

Method used

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  • Modified EVA microporous elastomer composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The EVA of 200g is repeatedly kneaded for 5min through the triangular bag on the open double-roller kneader with a roll temperature of 90°C, and then the mass percentages are respectively 6%, 0.6%, 0.2%, 0.4% and 0.2%. Foaming agent, DCP, zinc oxide, zinc stearate and stearic acid are added in the EVA, and then continue to repeatedly knead for 25 minutes through the triangular bag on the open double-roller kneader;

[0042] Coat the inner wall of the metal mold with release agent evenly, and then heat the metal mold to 150°C; put the modified EVA material after kneading into the metal mold, seal the mold and put it in an oven, heat it to 150°C, and keep it warm After 20 minutes, demould after cooling to obtain EVA microporous elastomer material. The tensile strength of the prepared material was 1.97MPa, and the elongation at break was 84.39%.

Embodiment 2

[0044] EVA 200g, 20g of polyurethane and 15g of styrene-butadiene rubber were mixed repeatedly for 25 minutes on an open double-roll mixer with a roll temperature of 90°C, and then the mass percentages were respectively 6%, 0.6%, and 0.2%. , 0.4% and 0.2% de foaming agent, DCP, zinc oxide, zinc stearate and stearic acid are added in EVA, and then continue to repeatedly knead for 25 minutes through a triangular bag on an open double-roller kneader;

[0045] Coat the inner wall of the metal mold with release agent evenly, and then heat the metal mold to 150°C; put the modified EVA material after kneading into the metal mold, seal the mold and put it in an oven, heat it to 150°C, and keep it warm After 20 minutes, demould after cooling to obtain EVA microporous elastomer material. The tensile strength of the prepared material was 2.23MPa, and the elongation at break was 104.23%.

Embodiment 3

[0047] The polyurethane of EVA200g, 20g and the styrene-butadiene rubber of 15g are mixed repeatedly 25min through the triangular bag on the open double-roller kneading machine that roll temperature is 90 ℃, and then the organic montmorillonite that mass fraction is 1% is added to the modification In the EVA material, continue to repeatedly knead for 25 minutes through the triangular bag on the open double-roller kneader;

[0048] The mass percentage content is respectively 6%, 0.6%, 0.2%, 0.4% and 0.2% de foaming agent, DCP, zinc oxide, zinc stearate and stearic acid are added in the modified EVA material, then continue to open Repeatedly kneading for 25min through the triangular bag on the double-roller kneader;

[0049] Coat the inner wall of the metal mold with release agent evenly, and then heat the metal mold to 150°C; put the modified EVA material after kneading into the metal mold, seal the mold and put it in an oven, heat it to 150°C, and keep it warm After cooling f...

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Abstract

The invention provides a modified EVA microporous elastomer composite material and a preparation method thereof. In the prior art, the properties of the EVA microporous elastomer composite material are modified mainly by mixing fillings in the EVA, which cannot satisfy the use of the composite material in special fields. The formula includes EVA material, organic montmorillonite, polyurethane, styrene-butadiene rubber, foaming agent, zinc oxide, zinc stearate and stearic acid; and the preparation method comprises the steps of: adding the montmorillonite in the EVA for melting, shearing and dispersion treatment; mixing with the polyurethane and the styrene-butadiene rubber on a double-roller mixing machine after cooling; and adding auxiliary agent, thin-passing for more than ten times, taking off sheets and cutting; coating parting agent on the inner wall of a metal mould, heating, drying, adding the cut mixture to the mould, sealing, heating for 20 minutes, cooling and demoulding. By adopting a nano-intercalation technology, the invention greatly improves the tensile modulus of the modified EVA microporous elastomer material on the premise of basically not decreasing the toughness.

Description

technical field [0001] The invention belongs to the field of elastomer composite materials, and in particular relates to a modified EVA microporous elastomer composite material and a preparation method thereof, in particular to a modified EVA microporous elastomer composite material reinforced by nano fillers and a preparation method thereof. Background technique [0002] Ethylene-vinyl acetate copolymer resin (EVA) is a kind of thermoplastic with rubber elasticity. In EVA molecules, due to the presence of vinyl acetate (VAc), the regularity of polyethylene (PE) molecular chains is reduced, and its crystallinity decreases accordingly, so that the molecular chains have a great ability to internally rotate during thermal motion. The improvement of its flexibility is significantly improved, and its macroscopic performance is very high elasticity. EVA with a VAc content of 12% to 30% can be used to manufacture high-rate independent cell room temperature foam plastics. It is wid...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08K13/02C08K3/34C08K3/22C08K5/098C08K5/09C08J9/04
Inventor 马建中赫玉欣张玉清高党鸽吕斌
Owner SHAANXI UNIV OF SCI & TECH
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