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Preparation method of secondary mold pressing foaming sole

A secondary molding and molding technology, which is applied in the field of foam materials, can solve the problems of low hardness and long production time, and achieve the effects of short production time, long production time and saving production costs

Active Publication Date: 2021-01-01
MAOTAI FUJIAN SOLES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a preparation method for secondary molded foamed soles, which solves the problems in the prior art that the first foaming of EVA foamed soles needs to be cooled for 24 hours, and the production time of roughing and other processes is long, and the improvement is achieved. Production efficiency, the beneficial effect of saving production costs, especially suitable for the production of foam materials with high elasticity, low hardness, skin-friendly, comfortable and other characteristics

Method used

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  • Preparation method of secondary mold pressing foaming sole
  • Preparation method of secondary mold pressing foaming sole
  • Preparation method of secondary mold pressing foaming sole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing a secondary molded foam material, comprising the following steps:

[0044] a) Prepare modified starch:

[0045] 1) Put 1000g of cornstarch in a four-hole reaction kettle, add distilled water under stirring conditions to prepare 40% (mass ratio) starch milk, add 30g of solid sodium chloride, heat up to 50°C, and use 0.5mol / L The NaOH solution was adjusted to a pH value of 11.0, and 20 g of sodium hexametaphosphate solid was added to keep the pH constant during the reaction, and the reaction time was 4 hours;

[0046] 2) Adjust the pH value to 8.5 with 0.5mol / L HCl solution, and add 75g of acetic anhydride dropwise. During the dropwise addition process, continuously neutralize the reaction system with 0.5mol / L NaOH solution to keep the pH value of the system basically unchanged. After the completion of acetic anhydride, the reaction was continued for 3.0h;

[0047] 3) After the reaction, adjust the pH to neutral with 0.5mol / L HCl solution, filter ...

Embodiment 2

[0060] A method for preparing a secondary molded foam material, comprising the following steps:

[0061] a) Prepare EVA material rice:

[0062] Mix 25 parts of EVA7350M, 39 parts of EVA7470M, 15 parts of POE81501, 1.7 parts of foaming agent AC, 1.0 parts of crosslinking agent BIBP, 1.5 parts of zinc stearate, 1.0 parts of zinc oxide, 1.0 parts of stearic acid, and 7 parts of talcum powder For refining, adjust the banburying temperature to 96°C, keep it for 6 minutes, then turn over the material twice, continue banburying and raise the temperature, and the discharge temperature is 106°C, after the banburying is completed, carry out refining and extrusion granulation to obtain EVA rice;

[0063] b) Foaming:

[0064] Pour the EVA material rice into a small vacuum foaming mold, heat up and foam, the foaming ratio is 164%, the mold temperature is 178°C, the foaming is completed, the mold is automatically opened, and the foaming embryo with a temperature of not lower than 130°C is ...

Embodiment 3

[0068] A method for preparing a secondary molded foam material, comprising the following steps:

[0069] a) Prepare EVA material rice:

[0070] 20 parts of EVA7470M, 25 parts of regenerated EVA, 18 parts of plasticized cork powder, 18 parts of modified starch, 2.1 parts of foaming agent AC, 1.2 parts of crosslinking agent BIBP, 1.6 parts of zinc stearate, 1.0 parts of zinc oxide, hard Mix 1.3 parts of fatty acid and 8 parts of talcum powder for banburying, adjust the banburying temperature to 95°C, keep it for 6 minutes, then turn over the material twice, continue banburying and heat up, the output temperature is 106°C, and start the banburying, Extrude and granulate to obtain EVA material rice;

[0071] b) Foaming:

[0072] Pour the EVA material rice into the suction barrel, automatically absorb the material, and inject and form it. The foaming ratio is 167%, the mold temperature is 182°C, and the foaming is completed, and the mold is automatically opened to obtain a foamed...

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Abstract

The invention discloses a preparation method of a secondary mold pressing foaming sole. The preparation method comprises the following steps: a) preparing EVA (Ethylene Vinyl Acetate) foam granules; b) conducting mold pressing foaming on the EVA foam granules obtained in the step a), wherein the first foaming ratio is 140%-185%, the foaming temperature is 172 DEG C-182 DEG C, conducting automaticmold opening after foaming is completed, and obtaining a foaming primary blank with the surface temperature not lower than 130 DEG C; an c) putting the foaming primary blank with the surface temperature not lower than 130 DEG C into an oil pressure mold, closing the mold, pushing the mold into a heating station of a secondary foaming forming machine, and conducting pressurizing and heating, wherein the ratio of the oil pressure mold is 135%-180%, the temperature is 170 DEG C-180 DEG C, and the time is 20 seconds-100 seconds; and then transferring the oil pressure mold to a cooling station, conducting pressurizing, spraying water to cool the mold, setting the mold for 150 seconds-400 seconds, pulling out the mold, taking out a finished product, and obtaining the foaming sole, wherein the first foaming ratio is greater than the foaming ratio of the oil pressure mold. According to the preparation method, after primary foaming, the product is immediately transferred to the oil pressure mold, the oil pressure heating foaming time is shortened, the energy consumption is reduced, and embossing is easy.

Description

technical field [0001] The invention relates to the technical field of foaming materials, in particular to a method for preparing foamed shoe soles by secondary molding. Background technique [0002] EVA material has developed very rapidly in recent years. Because of its low density, non-toxicity, good heat and sound insulation, etc., it is widely used in the manufacture of fitness equipment, shoe soles, mattresses and other products. [0003] The process of manufacturing EVA foam soles mainly includes molding foaming and injection foaming. Since injection foaming requires special EVA injection foaming equipment, the investment cost is relatively large, and the size of the product shrinks greatly and the fine patterns are not clear. Therefore, the existing High-grade EVA foam soles mostly use the production method of molded foam. [0004] The existing production steps of molded foamed shoe soles are as follows: After the foamed raw materials are banburyed, opened, extruded,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/04B29C44/08B29C44/34C08L23/08C08L97/02C08L3/02C08K13/02C08K5/098C08J9/10B29L31/50
CPCB29C44/08B29C44/04B29C44/3415C08J9/103B29L2031/504C08J2323/08C08J2423/08C08J2203/04C08K13/02C08K5/098
Inventor 卢鑫储晨辉廖毅彬王育玲罗显发丁思博丁思恩林剑坤陈振裕吴欢欢
Owner MAOTAI FUJIAN SOLES CO LTD
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