阅读说明：本技术 100%eva再生颗粒及其制备方法和应用 (100% EVA regenerated particle and preparation method and application thereof ) 是由 陈梓良 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种100％EVA再生颗粒及其制备方法和应用,其中100％EVA再生颗粒的制备方法的步骤包括：(1)分色破碎：将回收的EVA废料清洗、干燥,然后根据颜色进行分拣,再进行破碎；(2)压缩：将破碎后的EVA废料进行压缩；(3)塑化处理：将0.5～2份分散剂与压缩后的98份EVA废料进行塑化处理；(4)密炼：将0.5～2份软化油、0.1～1份粘合剂及塑化处理后的EVA废料进行密炼得到混合料；(5)造粒：将混合料挤出造粒,得到100％EVA再生颗粒；其中,上述各物质的含量皆以重量份数计。通过该方法可回收EVA废料,而且制得的100％EVA再生颗粒能够以高含量的添加比例应用于鞋用材料,使得EVA边角料更大程度地实现资源再利用。(The invention discloses 100% EVA regenerated particles and a preparation method and application thereof, wherein the preparation method of the 100% EVA regenerated particles comprises the following steps: (1) color separation and crushing: washing and drying the recycled EVA waste, sorting according to colors, and crushing; (2) compression: compressing the broken EVA waste; (3) plasticizing treatment: plasticizing 0.5-2 parts of dispersing agent and 98 parts of compressed EVA waste; (4) banburying: banburying 0.5-2 parts of softening oil, 0.1-1 part of adhesive and plasticized EVA waste to obtain a mixture; (5) and (3) granulation: extruding and granulating the mixture to obtain 100% EVA regenerated particles; wherein, the contents of the substances are calculated by weight parts. The method can recover EVA waste, and the prepared 100% EVA recycled particles can be applied to shoe materials in a high-content addition proportion, so that the EVA leftover materials can realize resource recycling to a greater extent.)

1. A preparation method of 100% EVA regenerated particles is characterized by comprising the following steps:

(1) color separation and crushing: washing and drying the recycled EVA waste, sorting according to colors, and crushing;

(2) compression: compressing the crushed EVA waste;

(3) plasticizing treatment: plasticizing 0.5-2 parts of dispersing agent and 98 parts of compressed EVA waste;

(4) banburying: banburying 0.5-2 parts of softening oil, 0.1-1 part of adhesive and the plasticized EVA waste to obtain a mixture;

(5) and (3) granulation: extruding and granulating the mixture to obtain 100% EVA regenerated particles;

wherein, the contents of the substances are calculated by weight parts.

2. The method of claim 1, wherein the recycled EVA waste is derived from EVA foam factories and EVA shoe material manufacturing enterprises scraps.

3. The method for preparing 100% EVA recycled particles of claim 1, wherein the banburying temperature is 140-180 ℃ and the banburying time is 30 min.

4. The method of preparing 100% EVA reconstituted grains according to claim 1, wherein the dispersing agent is at least one of polyvinylpyrrolidone, oxidized polyethylene wax, polyethylene wax and polypropylene wax.

5. The method of preparing 100% EVA recycling pellets according to claim 1, wherein the softening oil is at least one of naphthenic oil, aromatic oil and white mineral oil.

6. The method of preparing 100% EVA recycling pellets according to claim 1, wherein the binder is at least one of polyurethane and nitrocellulose.

7. 100% EVA recycled particles, prepared by the method for preparing 100% EVA recycled particles according to any one of claims 1-6.

8. Use of 100% EVA recycled particles according to claim 7 as a raw material for the production of EVA footwear materials.

9. Use of 100% EVA recycling particles as a raw material for the production of EVA footwear materials as claimed in claim 8, characterised in that the weight percentage of 100% EVA recycling particles in the EVA footwear material is up to 80%.

Technical Field

The invention relates to the technical field of shoe materials, in particular to 100% EVA regenerated particles and a preparation method and application thereof.

Background

With the rapid development of the shoe industry, the variety of the sole material is increasingly diversified. Solid soles of polyvinyl chloride and rubber, which have been the dominant ones in the traditional shoe industry, have been gradually replaced by emerging ethylene vinyl acetate copolymer (EVA) foamed soles. Ethylene-vinyl acetate copolymer as a high molecular polymer material has good plasticity, elasticity and processability, and the EVA material subjected to foaming treatment has the advantages of low density, good mechanical property, easy coloring and the like, so that the EVA is often widely applied to various foaming sole materials.

In China as a big shoe manufacturing country, the total number of shoes produced in 2018 is as follows: 126.2 million pairs, wherein the usage proportion of the EVA material is about 36.5%, the weight of the EVA leftover material and the defective product produced in China in one year is about 1.7 million tons calculated by the average weight of each pair and 15% loss, the EVA leftover material is usually subjected to superfine grinding and solid phase shearing grinding by a solid phase force chemical grinding machine in the prior art to finally obtain EVA shoe material powder, however, when the EVA shoe material powder is used as a preparation raw material in the EVA shoe material, the weight percentage of the EVA shoe material powder in the EVA shoe material is very low, namely, the powder can be only added and used in a small amount, otherwise, the physical property of the EVA shoe material is changed, so that the EVA leftover material cannot be reused to a greater extent through the prior art, which undoubtedly causes resource waste, and also causes difficulty in recycling the EVA leftover material.

Therefore, a 100% EVA recycled particle and a preparation method thereof are needed to solve the deficiencies of the prior art.

Disclosure of Invention

The invention aims to provide a preparation method of 100% EVA recycled particles, which can be used for recovering EVA waste materials, and the prepared 100% EVA recycled particles can be applied to shoe materials in a high-content adding proportion, so that EVA leftover materials can be recycled to a greater extent.

The invention also aims to provide 100% EVA recycled particles, and the resource recycling can be realized to a greater extent by applying the 100% EVA recycled particles to the EVA shoe material.

The invention also aims to provide application of 100% EVA recycled particles as a raw material for preparing EVA shoe materials.

In order to achieve the above object, the present invention provides a method for preparing 100% EVA recycled particles, comprising the steps of:

(1) color separation and crushing: washing and drying the recycled EVA waste, sorting according to colors, and crushing;

(2) compression: compressing the broken EVA waste;

(3) plasticizing treatment: plasticizing 0.5-2 parts of dispersing agent and 98 parts of compressed EVA waste;

(4) banburying: banburying 0.5-2 parts of softening oil, 0.1-1 part of adhesive and plasticized EVA waste to obtain a mixture;

(5) and (3) granulation: extruding and granulating the mixture to obtain 100% EVA regenerated particles;

wherein, the contents of the substances are calculated by weight parts.

Compared with the prior art, the preparation method of the 100% EVA recycled particles sequentially performs color separation crushing, compression, plasticizing treatment, banburying and granulation on the recycled EVA waste, and the finally prepared 100% EVA recycled particles can be applied to shoe materials in a high-content addition proportion, so that the EVA leftover materials can be recycled to a greater extent.

Preferably, the recycled EVA waste of the present invention is derived from various EVA foam material factories and the leftover materials of EVA shoe material manufacturing enterprises.

Preferably, the banburying temperature is 140-180 ℃, and the banburying time is 30 min.

Preferably, the dispersant of the present invention is at least one of polyvinylpyrrolidone, oxidized polyethylene wax, polyethylene wax and polypropylene wax. The purpose of the dispersant is to improve the uniformity of dispersion of the softening oil and binder in the EVA waste.

Preferably, the softening oil of the present invention is at least one of naphthenic oil, aromatic oil and white mineral oil. The EVA waste is subjected to the action of mechanical force and heat in banburying, and under the action of the mechanical force and the heat, the softening oil is embedded into EVA molecules to enable the EVA molecules to move, so that cross-linking bonds in the EVA waste molecules are broken under the action of the mechanical force and chemical substances, the network structure in the EVA waste molecules is broken, the activity capability of molecular chains is improved, the plasticity of the EVA waste is further improved, and the physical and chemical properties of the EVA shoe material are further improved.

Preferably, the binder of the present invention is at least one of polyurethane and nitrocellulose. The addition of the adhesive can improve the binding force among EVA molecules, thereby enhancing the mechanical property of the EVA waste material and further enhancing the physicochemical property of the EVA shoe material.

Preferably, the sorted EVA waste is thrown into a crusher to be crushed.

Preferably, the crushed EVA waste is put into an open mill for compression, and the physical volume of the crushed EVA waste can be reduced due to the fact that the crushed EVA waste is in a fluffy state.

Preferably, 0.5-2 parts of dispersing agent and 98 parts of compressed EVA waste are put into a desulfurization plasticizing machine for plasticizing.

Preferably, 0.5-2 parts of softening oil, 0.1-1 part of adhesive and the plasticized EVA waste are put into an internal mixer to be internally mixed to obtain a mixture.

Preferably, the mixture is put into a double-screw extruder for extrusion granulation.

In order to achieve the above object, the present invention also provides 100% EVA recycled particles prepared by the above-mentioned method for preparing 100% EVA recycled particles.

In order to achieve the above purpose, the invention also provides the application of the 100% EVA recycled particles mentioned above as a preparation raw material in EVA shoe materials.

Preferably, the weight percentage of the 100% EVA recycled particles in the EVA shoe material is up to 80%; the prepared 100% EVA recycled particles can be applied to shoe materials in an addition proportion of 80%, so that the EVA leftover materials can realize resource recycling to a greater extent.

Detailed Description

In order to explain the technical aspects, objects, and effects of the present invention in detail, the following detailed description will be given with reference to specific examples.

Example 1

A preparation method of 100% EVA regenerated particles comprises the following steps:

(1) color separation and crushing: washing and drying the recycled EVA waste, sorting the EVA waste according to colors, and crushing the sorted EVA waste in a crusher;

(2) compression: putting the crushed EVA waste into an open mill for compression;

(3) plasticizing treatment: putting 1 part of polyvinylpyrrolidone and compressed 98 parts of EVA waste into a desulfurization plasticizing machine for plasticizing;

(4) banburying: adding 1 part of naphthenic oil, 0.5 part of polyurethane adhesive and plasticized EVA waste into an internal mixer for internal mixing to obtain a mixture, wherein the internal mixing temperature is 165 ℃, and the internal mixing time is 30 min;

(5) and (3) granulation: putting the mixture into a double-screw extruder for extrusion granulation to obtain 100% EVA regenerated particles;

wherein, the contents of the substances are calculated by weight parts.

Example 2

A preparation method of 100% EVA regenerated particles comprises the following steps:

(1) color separation and crushing: washing and drying the recycled EVA waste, sorting the EVA waste according to colors, and crushing the sorted EVA waste in a crusher;

(2) compression: putting the crushed EVA waste into an open mill for compression;

(3) plasticizing treatment: 2 parts of oxidized polyethylene wax and 98 parts of compressed EVA waste are put into a desulfurization plasticizing machine for plasticizing treatment;

(4) banburying: putting 0.5 part of white mineral oil, 1 part of cellulose nitrate adhesive and plasticized EVA waste into an internal mixer for internal mixing to obtain a mixture, wherein the internal mixing temperature is 170 ℃, and the internal mixing time is 30 min;

(5) and (3) granulation: putting the mixture into a double-screw extruder for extrusion granulation to obtain 100% EVA regenerated particles;

wherein, the contents of the substances are calculated by weight parts.

Comparative example 1

A preparation method of EVA recycled powder comprises the following steps:

and washing and drying the recovered EVA waste, sorting the EVA waste according to colors, and putting the sorted EVA waste into a grinding machine for superfine grinding and solid phase shearing and grinding to obtain EVA recovery powder.

Comparative example 2

A preparation method of 100% EVA regenerated particles comprises the following steps:

(1) color separation and crushing: washing and drying the recycled EVA waste, sorting the EVA waste according to colors, and crushing the sorted EVA waste in a crusher;

(2) compression: putting the crushed EVA waste into an open mill for compression;

(3) plasticizing treatment: putting the compressed 98 parts of EVA waste into a desulfurization plasticizing machine for plasticizing;

(4) banburying: putting 1 part of polyvinylpyrrolidone, 1 part of naphthenic oil, 0.5 part of polyurethane adhesive and plasticized EVA waste into an internal mixer for internal mixing to obtain a mixture, wherein the internal mixing temperature is 165 ℃, and the internal mixing time is 30 min;

(5) and (3) granulation: putting the mixture into a double-screw extruder for extrusion granulation to obtain 100% EVA regenerated particles;

wherein, the contents of the substances are calculated by weight parts.

Comparative example 3

A preparation method of 100% EVA regenerated particles comprises the following steps:

(1) color separation and crushing: washing and drying the recycled EVA waste, sorting the EVA waste according to colors, and crushing the sorted EVA waste in a crusher;

(2) compression: putting the crushed EVA waste into an open mill for compression;

(3) plasticizing treatment: putting 1 part of polyvinylpyrrolidone and compressed 98 parts of EVA waste into a desulfurization plasticizing machine for plasticizing;

(4) banburying: 0.5 part of polyurethane adhesive and the plasticized EVA waste are put into an internal mixer for internal mixing to obtain a mixture, wherein the internal mixing temperature is 165 ℃, and the internal mixing time is 30 min;

(5) and (3) granulation: putting the mixture into a double-screw extruder for extrusion granulation to obtain 100% EVA regenerated particles;

wherein, the contents of the substances are calculated by weight parts. The recycled EVA wastes in examples 1-2 and comparative examples 1-3 originate from EVA foam material factories and leftover materials of EVA shoe material manufacturers.

The 100% EVA recycling pellets prepared in example 1 were used as a preparation raw material in EVA footwear materials, specifically, the 100% EVA recycling pellets were used in EVA footwear materials in the weight percentages of 10%, 30%, 50%, and 80%, respectively, and the physical properties of the EVA footwear materials were tested, and the physical properties of footwear materials prepared from the 100% EVA recycling were tested under the same test conditions, and the test results are shown in table 1 below.

TABLE 1

The 100% EVA recycled particles prepared in example 2 were used as a raw material for EVA footwear, specifically, the 100% EVA recycled particles were used in the EVA footwear in an amount of 10%, 30%, 50%, 80% by weight, respectively, and the physical properties of the EVA footwear were tested, and the physical properties of the footwear made of the 100% EVA recycled particles were tested under the same test conditions, and the test results are shown in table 2 below.

TABLE 2

The EVA reclaimed powder prepared in comparative example 1 was applied as a preparation raw material to EVA footwear materials, specifically, 100% EVA recycled particles were 10%, 15%, 20% by weight in the EVA footwear materials, respectively, and the physical properties of the EVA footwear materials were tested, and the physical properties of footwear materials prepared from 100% EVA virgin materials were tested under the same test conditions, and the test results are shown in table 3 below.

TABLE 3

The 100% EVA recycled particles prepared in comparative example 2 were applied as a preparation raw material to EVA footwear materials, specifically, the 100% EVA recycled particles were 10% and 30% by weight, respectively, in the EVA footwear materials, and the physical properties of the EVA footwear materials were tested, and the physical properties of the footwear materials prepared from the 100% EVA recycled particles were tested under the same test conditions, and the test results are shown in table 4 below.

TABLE 4

The 100% EVA recycled particles prepared in comparative example 3 were applied as a preparation raw material to EVA footwear materials, specifically, the 100% EVA recycled particles were 10% and 30% by weight, respectively, in the EVA footwear materials, and the physical properties of the EVA footwear materials were tested, and the physical properties of the footwear materials prepared from the 100% EVA recycled particles were tested under the same test conditions, and the test results are shown in table 5 below.

TABLE 5

As can be seen from tables 1 to 2, the 100% EVA recycled particles prepared by the preparation method of the 100% EVA recycled particles can be applied to shoe materials at an addition ratio of 80%, the shoe materials cannot be greatly changed, and the EVA leftover materials can be recycled to a greater extent.

As can be seen from Table 3, when the EVA leftover material is milled to obtain EVA shoe material powder, and the EVA shoe material powder is used as a raw material for preparing EVA shoe materials, the weight percentage of the EVA shoe material powder in the EVA shoe material is low, and when the weight percentage of the EVA shoe material powder in the EVA shoe material reaches 20%, the physical properties of the shoe material are changed, that is, the powder can only be added in a small amount, otherwise, the physical properties of the EVA shoe material are changed, which also shows that the EVA leftover material cannot be reused to a greater extent.

As can be seen from Table 4, if the dispersing agent is added during banburying, the weight percentage of the prepared 100% EVA recycled particles in the EVA shoe material is up to 30%, otherwise, the physical properties of the EVA shoe material are changed, i.e., the EVA leftover materials cannot be recycled to a greater extent.

As can be seen from Table 5, if softening oil is removed during banburying, the weight percentage of the prepared 100% EVA recycled particles in the EVA shoe material is up to 30%, otherwise, the physical properties of the EVA shoe material are changed, i.e. the EVA leftover materials cannot be recycled to a greater extent.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the best embodiments, the present invention is not limited to the above disclosed embodiments, but should cover various modifications, equivalent combinations, made according to the essence of the present invention.