阅读说明：本技术 一种发泡鞋底的制作方法 (Method for manufacturing foamed sole ) 是由 丁馨兰 卢鑫 丁佳怡 陈振裕 罗显发 丁思博 廖毅彬 于 2019-10-28 设计创作，主要内容包括：本发明属于有机高分子化合物技术领域,特别涉及一种发泡鞋底的制作方法,由下述组分按重量份原料制得：回收EVA膜10-80份、EVA 15-40份、海藻粉5-25份、发泡剂AC 1.3-1.6份、交联剂BIBP 0.7-0.9份、硬脂酸锌0.4-0.6份、硬脂酸0.5-0.7份、耐磨剂1.5-2份,经过密炼、开炼、造粒,再经一次射出成型,得到含海藻粉的可生物降解发泡鞋底。本发明制备的发泡鞋底,实现EVA鞋底料头、次品、废品和边角料的资源回收再利用,并具备可生物降解性,能缓解白色污染带来的环境问题,助推全球可持续发展。(The invention belongs to the technical field of organic high molecular compounds, and particularly relates to a method for manufacturing a foamed sole, which is prepared from the following raw materials in parts by weight: 10-80 parts of recovered EVA film, 15-40 parts of EVA, 5-25 parts of seaweed meal, 1.3-1.6 parts of foaming agent AC, 0.7-0.9 part of cross-linking agent BIBP, 0.4-0.6 part of zinc stearate, 0.5-0.7 part of stearic acid and 1.5-2 parts of wear-resisting agent, banburying, open refining, granulating and then carrying out one-time injection molding to obtain the biodegradable foamed sole containing the seaweed meal. The foamed sole prepared by the invention realizes the resource recycling of EVA sole stub bars, defective products, waste products and leftover materials, has biodegradability, can relieve the environmental problem caused by white pollution, and helps to promote global sustainable development.)

1. The manufacturing method of the foaming sole is characterized by comprising the following steps:

(a) crushing the waste EVA material to form a crushed material;

(b) carrying out banburying and open milling on 72 parts of the crushed material, 5 parts of mineral oil and 74706 parts of EVA, and then rolling to obtain a recovered EVA film;

(c) preparing biodegradable material rice, wherein the biodegradable material rice is prepared from the following components in parts by weight:

firstly, uniformly mixing other raw materials except the crosslinking agent BIBP and the foaming agent AC, then carrying out banburying, adjusting the banburying temperature to be 86-91 ℃, keeping for 4 minutes and then stirring; when the banburying temperature is increased to 95 ℃, turning materials for the second time; when the banburying temperature is increased to 101 ℃, turning for the third time, and adding the crosslinking agent BIBP and the foaming agent AC; when the banburying temperature rises to 107 ℃, turning materials for the fourth time; when the banburying temperature rises to 112 ℃, turning over materials for the fifth time, banburying for 1 minute, and finally pouring, opening and granulating to obtain biodegradable material rice;

(d) adding the biodegradable material into a machine, automatically sucking the material, and performing one-time injection molding at the gun temperature of 90-105 ℃, the mold temperature of 175-180 ℃ and the time of 180-220 seconds to obtain the foamed sole.

2. The method of claim 1, wherein the waste EVA materials in step (a) include scrap, defective products, waste products, and leftover materials generated during the production of EVA shoe soles.

3. The method for manufacturing a foamed shoe sole according to claim 1, wherein the thickness of the crushed material in the step (a) is 1.3mm to 3mm, and the width of the crushed material is 2mm to 5 mm.

4. The method for manufacturing the foamed sole according to claim 1, wherein the thickness of the recycled EVA film is 0.01mm to 0.05 mm.

5. The method for manufacturing the foamed sole according to claim 4, wherein the thickness of the recycled EVA film is 0.01mm to 0.02 mm.

6. The method of claim 1, wherein the amount of the recycled EVA film in the step (c) is 2 to 2.2 times the amount of the EVA film.

7. The method as claimed in claim 1, wherein the seaweed powder in step (c) is obtained by drying and desalting natural seaweed with a fineness of 400-3000 mesh.

8. The method for manufacturing a foamed shoe sole according to claim 1, wherein the foaming agent AC in the step (c) is a modified foaming agent AC, and the decomposition temperature is 170 ℃ to 200 ℃.

9. The method for manufacturing a foamed shoe sole according to claim 1, wherein the biodegradable rice in the step (c) is cake-shaped, and has a thickness of 1.5mm to 4mm and a diameter of 4mm to 8 mm.

10. The method for manufacturing the foamed sole according to claim 1 or 2, wherein the waste EVA material is crushed by a crusher, the crusher is of a double-roller semi-open type, the distance between a front roller and a rear roller is 1mm-4mm, the speed ratio of the front roller to the rear roller is 1:1-1:2, and the temperature of the rollers is 0 ℃ to 50 ℃.

Technical Field

The invention belongs to the technical field of organic high molecular compounds, and particularly relates to a manufacturing method of a foamed sole.

Background

The EVA foamed sole is made of EVA materials, has the advantages of high rebound resilience and tensile strength, high toughness, good shock resistance and buffering performance, excellent heat preservation and cold protection, excellent low-temperature performance and the like, and has a very important position in the shoe material industry.

The existing EVA foaming sole formula usually contains the following components: the rubber particles comprise natural rubber, butadiene rubber, nitrile rubber, EVA (ethylene vinyl acetate), talcum powder, a foaming agent, a DCP (DCP) crosslinking agent, an anti-aging agent and graphene, wherein the foaming agent and the DCP crosslinking agent are generally indispensable components in a foamed sole, chemical crosslinking can be generated between the foaming agent and the DCP crosslinking agent after heating, the EVA sole has larger molecular polymerization degree and strong intermolecular force, and the obtained foamed sole rubber particles have good wear resistance and toughness and strong aging resistance.

The production of the EVA foaming sole can generate redundant EVA waste, and the existing method is to grind the EVA waste into powder or prepare the EVA waste into particles to be secondarily used in the production process of the EVA foaming sole.

However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the inventors of the present application find that the above-mentioned technology has at least the following technical problems:

1. the EVA foamed sole prepared by the existing EVA foamed sole formula is difficult to degrade, and serious pollution is brought to the environment due to long-term accumulation;

2. the EVA waste is ground into powder or made into granules, which accounts for at most 20 percent of all EVA when in use, and the utilization rate of the EVA waste is too low.

Disclosure of Invention

The embodiment of the application provides a manufacturing method of the foaming sole, solves the technical problems that in the prior art, an EVA foaming sole is difficult to degrade, and the utilization rate of EVA waste materials in the production process of the EVA foaming sole is too low, realizes the recycling of high-value resources of EVA sole leftover materials, and has biodegradable seaweed powder-containing biodegradable foaming sole, so that the environmental problem caused by white pollution can be relieved, and the global sustainable development can be promoted.

The embodiment of the application provides a manufacturing method of a foaming sole, which comprises the following steps:

(a) crushing the waste EVA material to form a crushed material;

(b) carrying out banburying and open milling on 72 parts of the crushed material, 5 parts of mineral oil and 74706 parts of EVA, and then rolling to obtain a recovered EVA film;

(c) preparing biodegradable material rice, wherein the biodegradable material rice is prepared from the following components in parts by weight:

firstly, uniformly mixing other raw materials except the crosslinking agent BIBP and the foaming agent AC, then carrying out banburying, adjusting the banburying temperature to be 86-91 ℃, keeping for 4 minutes and then stirring; when the banburying temperature is increased to 95 ℃, turning materials for the second time; when the banburying temperature is increased to 101 ℃, turning for the third time, and adding a crosslinking agent BIBP and a foaming agent AC; when the banburying temperature rises to 107 ℃, turning materials for the fourth time; when the banburying temperature rises to 112 ℃, turning over materials for the fifth time, banburying for 1 minute, and finally pouring, opening and granulating to obtain biodegradable material rice;

(d) adding the biodegradable material into a machine, automatically sucking the material, and performing one-time injection molding at the gun temperature of 90-105 ℃, the mold temperature of 175-180 ℃ and the time of 180-220 seconds to obtain the foamed sole.

Further, the waste EVA materials in the step (a) comprise scrap heads, defective products, waste products and leftover materials generated in the process of producing EVA shoe soles.

Further, the thickness of the broken material in the step (a) is 1.3mm-3mm, and the width of the broken material is 2mm-5 mm.

Further, the thickness of the recovered EVA film is 0.01mm-0.05 mm.

Further, the thickness of the recovered EVA film is 0.01mm-0.02 mm.

Further, the amount of the recovered EVA film in the step (c) is 2 to 2.2 times the amount of the EVA film.

Furthermore, the seaweed powder in the step (c) is obtained by drying and desalting natural seaweed, and the fineness is 400-3000 meshes.

Further, the foaming agent AC in the step (c) is a modified foaming agent AC, and the decomposition temperature is 170-200 ℃.

Further, the biodegradable rice in the step (c) is cake-shaped, and has a thickness of 1.5mm-4mm and a diameter of 4mm-8 mm.

Further, the waste EVA materials are crushed by a crusher, the crusher is of a double-roller semi-open type, the distance between a front roller and a rear roller is 1mm-4mm, the speed ratio of the front roller to the rear roller is 1:1-1:2, and the roller temperature is 0-50 ℃.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

1. the seaweed powder is dried and desalted by natural seaweed, is environment-friendly and biodegradable, is easy to be decomposed and metabolized by enzymes in various microorganisms or animals and plants in the nature, is a typical biodegradable polymer material, and residues exist in dispersed small particles of powder; the seaweed powder does not react with other components of the EVA sole and is uniformly dispersed in the EVA sole, so that the EVA sole can be dispersed into fine particles after the seaweed powder is naturally degraded, the effect of degrading the EVA sole is achieved, the environmental problem caused by white pollution is greatly relieved, the petroleum resource is saved, the global greenhouse effect is reduced, the development direction of the current materials is met, and the global sustainable development is promoted.

2. The recycling EVA film obtained by crushing, banburying and calendering the stub bars, defective products, waste products and leftover materials generated in the process of producing the EVA sole by a crusher effectively solves the problem of difficult recycling of the EVA foamed sole, further realizes recycling of the EVA sole waste materials, can well remove solid insoluble substances such as sand, metal, glass and the like, avoids the problems of large dust, easy material death and easy ignition of the ground EVA leftover materials, and realizes high-value recycling of the EVA leftover materials and the secondary waste materials.

3. The recycled EVA film and the EVA are adopted, and the recycled EVA film is 2-2.2 times of the EVA film, so that the problem of low utilization rate of the recycled EVA film is effectively solved, the recycled EVA film is used as a main system, the EVA is used for adjusting the overall performance, and the obtained EVA foamed sole has the characteristics of light weight, high elasticity, low cost and the like³Hardness of 62C, DIN abrasion resistance of 181mm³And a rebound resilience of 57%; comparative example C biodegradable foamed shoe sole containing seaweed powder and having a density of 0.19g/cm³Hardness 60C, DIN wear resistance 284mm³The rebound rate is 49%, namely the property of the recycled EVA film is obviously better than that of the EVA recycled powder, and compared with the commercially available EVA sole material, the recycled EVA sole material has the performance close to or even better than that of the commercially available EVA sole material, so that the high-value recycling of the EVA is realized, the utilization rate of the EVA is improved, the raw material cost is reduced, and the recycled EVA sole material is more environment-friendly.

Detailed Description

The embodiment of the application provides a manufacturing method of the foaming sole, and solves the problems that in the prior art, the EVA foaming sole is difficult to degrade, and the utilization rate of EVA waste is too low.

The invention will now be further illustrated with reference to specific examples.

The following are a summary of the raw material compositions of the examples and comparative examples, resulting in table 1:

TABLE 1 summary of the raw material compositions of the examples and comparative examples