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Preparation method of foaming material with gradient pore structure

A foamed material and gradient hole technology, applied in the field of foamed material preparation, can solve problems such as difficulty, unsuitability for large-scale application in industrial production, equipment complexity and temperature field control, etc., and achieves excellent product quality, convenient pore size control, The effect of high production efficiency

Active Publication Date: 2021-07-23
浙江新恒泰新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation of gradient porous materials with different temperature fields is not suitable for large-scale application in industrial production due to the complexity of the equipment and the difficulty in controlling the temperature field.

Method used

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  • Preparation method of foaming material with gradient pore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present invention provides a method for preparing a foamed material with a gradient pore structure, comprising the following steps:

[0040] S1: Using polymer as the matrix, mechanically blending different contents of foaming aids, lubricants, nucleating agents, crosslinking agents, and foaming agents, and preparing large-cell foaming master pieces by internal mixing and opening. And small cell foam master sheet;

[0041] S2: Measure the density of the foamed master sheet, and calculate the mass of the master sheet required to fill more than 90% of the cavity volume according to the cavity volume, among which, the mass ratio of the large-cell foamed master sheet to the small-cell foamed master sheet 1:1;

[0042] S3: Close the mold for microwave heating and foaming, the heating temperature is 165-175°C, and the mold closing time is 400-700s;

[0043] S4: Release the pressure immediately after the mold is closed and heated, and open the mold within 3 seconds to obt...

Embodiment 2

[0053] Including the following steps:

[0054] S1: Take 1kgEVA, 30gAC, 10gZnO, 10gST, 10gDCP, 200gCaCO3, mix and banbury to make a large cell foam master sheet;

[0055] S2: Take 1kgEVA, 30gNaHCO3, 10gZnO, 10gST, 10gDCP, 200gCaCO3 and mix and banbury to make a small cell foaming mother sheet;

[0056] S3: Measure the density of the master sheet, and calculate the mass of the foamed master sheet filled with 95% of the cavity volume according to the cavity volume, wherein the mass ratio of the large-cell foamed mother sheet to the small-cell foamed mother sheet is 1: 1;

[0057] S4: Close the mold for microwave heating and foaming, control the temperature at 165°C, release the pressure quickly after closing the mold for 600s, and open the mold within 3 seconds to obtain a foaming material with a gradient pore structure.

[0058] The cross-sectional electron microscope picture of the foam material made in the present embodiment is as follows figure 1 As shown, there is an obvi...

Embodiment 3

[0060] Including the following steps:

[0061] S1: Take 1kgEVA, 40gOBSH, 10gZnO, 10gST, 10gDCP, 100gCaCO3 and mix and banbury to make a large cell foam master sheet;

[0062] S2: Take 1kgEVA, 50gNaHCO3, 10gZnO, 10gST, 10gDCP, 100gCaCO3 and mix and banbury to make a small cell foaming mother sheet;

[0063] S3: Measure the density of the master sheet, and calculate the mass of the foamed master sheet filled with 95% of the cavity volume according to the cavity volume, wherein the mass ratio of the large-cell foamed mother sheet to the small-cell foamed mother sheet is 1: 1;

[0064] S4: Close the mold for microwave heating and foaming, control the temperature at 165°C, release the pressure quickly after closing the mold for 700s, and open the mold within 3 seconds to obtain a foaming material with a gradient pore structure.

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Abstract

The invention discloses a preparation method of a foaming material with a gradient pore structure. The preparation method comprises the following steps: with a polymer as a matrix, mechanically blending a foaming aid, a lubricant, a nucleating agent, a cross-linking agent and a foaming agent with different contents, and respectively preparing a large-cell foaming master slice and a small-cell foaming master slice in a banburying and open milling manner; measuring the density of the foaming master slice, and calculating the mass of the master slices required for filling in more than 90% of the volume of a mold cavity according to the volume of the mold cavity, wherein a mass ratio of the foaming master slices with large foam holes to the foaming master slices with small foam holes is 1: 1; conducting mold closing for microwave heating foaming, wherein heating temperature is 165-175 DEG C, and mold closing time is 400-700 s; and after mold closing and heating, releasing pressure immediately, and conducting mold opening. According to the invention, the melt strength and viscosity of corresponding materials are changed by utilizing different types of foaming agents and different heat absorption and release in a foaming process, so resistance applied to a bubble growth process is different; and therefore, the foaming material with the gradient pore structure is prepared, and the foaming material is high in production efficiency and suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the field of foam material preparation, in particular to a method for preparing foam material with gradient pore structure. Background technique [0002] Functionally graded material refers to a material whose structure, function or composition changes continuously or shows regularity. Functionally graded pore structure refers to a kind of pore structure or pore density inside the material that presents a gradient change, and this change runs through the entire porous material. Compared with traditional porous materials, materials with functionally graded pore structures have unique advantages in many aspects, such as [Ghaffari Mosanenzadeh S et al. Compared with traditional porous materials, the gradient pore structure has a wider sound absorption frequency in terms of sound absorption. Therefore, foamed materials with gradient pore structure have very broad application prospects. [0003] At present, the method of preparin...

Claims

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Application Information

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IPC IPC(8): C08J9/10C08J9/08C08L23/08C08L23/06C08K13/02C08K3/22C08K5/09C08K5/14C08K3/26
CPCC08J9/105C08J9/103C08J9/08C08J9/0095C08J9/0066C08J9/0023C08J9/0061C08J2203/04C08J2203/02C08J2323/08C08J2323/06C08K13/02C08K2003/2296C08K5/09C08K5/14C08K2003/265
Inventor 翁成龙王佳林王镇
Owner 浙江新恒泰新材料股份有限公司
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