阅读说明：本技术 一种eva发泡鞋材及其制备方法 (EVA (ethylene-vinyl acetate copolymer) foamed shoe material and preparation method thereof ) 是由 吴丹妮 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种EVA发泡鞋材及其制备方法,制备所述EVA发泡鞋材的原料及其重量份组成为：马来酸酐接枝EVA树脂52份～72份、乙烯-辛烯共聚物8.5份～12.5份、碳酸镁2.2份～5.2份、苯磺酰肼0.3份～1.3份、过氧化二异丙苯0.2份～0.8份、二氨基环己烷0.6份～1.6份、改性纳米二氧化钛1.2份～3.2份、填充剂1.4份～4.4份。本发明EVA发泡鞋材,选用马来酸酐接枝EVA树脂具有较好的弹性和耐候性,作为鞋底材料时,与中底和大底的相容性较好,而且添加改性纳米二氧化钛和填充剂,得到的EVA发泡鞋材硬度适中,具有较好的耐磨性和舒适度,实用性高。(The invention discloses an EVA (ethylene vinyl acetate) foaming shoe material and a preparation method thereof, wherein the EVA foaming shoe material is prepared from the following raw materials in parts by weight: 52 to 72 parts of maleic anhydride grafted EVA resin, 8.5 to 12.5 parts of ethylene-octene copolymer, 2.2 to 5.2 parts of magnesium carbonate, 0.3 to 1.3 parts of benzenesulfonyl hydrazide, 0.2 to 0.8 part of dicumyl peroxide, 0.6 to 1.6 parts of diaminocyclohexane, 1.2 to 3.2 parts of modified nano titanium dioxide and 1.4 to 4.4 parts of filler. According to the EVA foaming shoe material, the maleic anhydride grafted EVA resin has good elasticity and weather resistance, and is good in compatibility with the insole and the outsole when used as a sole material, and the EVA foaming shoe material obtained by adding the modified nano titanium dioxide and the filler has moderate hardness, good wear resistance and comfort and high practicability.)

1. The EVA foaming shoe material is characterized by comprising the following raw materials in parts by weight: 52 to 72 parts of maleic anhydride grafted EVA resin, 8.5 to 12.5 parts of ethylene-octene copolymer, 2.2 to 5.2 parts of magnesium carbonate, 0.3 to 1.3 parts of benzenesulfonyl hydrazide, 0.2 to 0.8 part of dicumyl peroxide, 0.6 to 1.6 parts of diaminocyclohexane, 1.2 to 3.2 parts of modified nano titanium dioxide and 1.4 to 4.4 parts of filler.

2. The EVA foaming shoe material of claim 1, which is prepared from the following raw materials in parts by weight: 56 to 70 portions of maleic anhydride grafted EVA resin, 9.0 to 11.5 portions of ethylene-octene copolymer, 2.8 to 4.8 portions of magnesium carbonate, 0.5 to 1.1 portions of benzenesulfonyl hydrazide, 0.4 to 0.6 portion of dicumyl peroxide, 0.8 to 1.4 portions of diaminocyclohexane, 1.8 to 3.0 portions of modified nano titanium dioxide and 1.8 to 4.0 portions of filler.

3. The EVA foaming shoe material of claim 1, which is prepared from the following raw materials in parts by weight: 64 parts of maleic anhydride grafted EVA resin, 10.4 parts of ethylene-octene copolymer, 3.8 parts of magnesium carbonate, 0.8 part of benzenesulfonyl hydrazide, 0.5 part of dicumyl peroxide, 1.2 parts of diaminocyclohexane, 2.5 parts of modified nano titanium dioxide and 2.6 parts of filling agent.

4. The EVA foaming shoe material of claim 1, wherein the filler is prepared from stearic acid, corn fiber, ceramic particles, nano zinc oxide, superfine calcium carbonate and palmitic acid according to a mass ratio of 1: 2.2: 0.8: 1.5: 2.5: 2.0-3.0.

5. The EVA foaming shoe material of claim 4, wherein the filler is prepared from stearic acid, corn fiber, ceramic particles, nano zinc oxide, superfine calcium carbonate and palmitic acid according to a mass ratio of 1: 2.2: 0.8: 1.5: 2.5: 2.5.

6. The EVA foaming shoe material of claim 1, wherein the preparation method of the modified nano titanium dioxide comprises the following steps: preparing the nano titanium dioxide into a dispersion liquid with the mass fraction of 15-25%, then adding water glass, dropwise adding 0.2-0.5 mol/L acetic acid solution, grinding and dispersing for 3-5 min, then carrying out heat preservation reaction for 1-3 h at the temperature of 35-45 ℃, and finally carrying out suction filtration and drying to obtain the modified nano titanium dioxide.

7. The EVA foaming shoe material of claim 6, wherein in the preparation method of the modified nano titanium dioxide, the ratio of the nano titanium dioxide, the water glass and the acetic acid solution is 10 g: 2.5 g-3.5 g: 0.5mL to 1.5 mL.

8. The preparation method of the EVA foaming shoe material according to any one of claims 1 to 7, which is characterized by comprising the following steps:

step one, adding the maleic anhydride grafted EVA resin, the ethylene-octene copolymer, the modified nano titanium dioxide and the filler in parts by weight into an internal mixer, and mixing for 8-12 min at the temperature of 95-115 ℃ to obtain a primary mixture;

and step two, adding the magnesium carbonate, benzenesulfonyl hydrazide, dicumyl peroxide and diaminocyclohexane in parts by weight into the primary mixture obtained in the step one, continuously mixing for 3-6 min at the temperature of 110-125 ℃, then transferring into a granulator for granulation, and finally obtaining the EVA foamed shoe material through foaming.

9. The method according to claim 8, wherein the granulation length in the second step is 1.5mm to 2.5 mm.

Technical Field

The invention relates to the technical field of shoe materials, in particular to an EVA (ethylene vinyl acetate) foaming shoe material and a preparation method thereof.

Background

The development of the traditional manufacturing industry and the shoe manufacturing industry develop rapidly, and the annual output exceeds 100 hundred million pairs. With the progress of the times, the improvement of the living quality of people and the transformation of consumption and living concepts have more and more requirements on shoe materials and are stricter, so that the shoe materials are comfortable, fashionable and convenient and become the development direction of the shoe making industry so as to meet the requirements of users.

The ethylene and vinyl acetate copolymer (EVA) foaming material has the advantages of small density, good mechanical property, easy coloring and the like, and is widely applied in the shoe material industry, but the shoe material made of the ethylene and vinyl acetate copolymer (EVA) foaming material has poor elasticity and weather resistance, so the development of the ethylene and vinyl acetate copolymer (EVA) foaming material in the field of sports shoes is limited,

the introduction of the nonpolar elastomer through the rubber and plastic modification technology can effectively improve the elasticity of the ethylene and vinyl acetate copolymer (EVA) foaming material, but due to the nonpolar molecular structure characteristic, the high elasticity of the ethylene and vinyl acetate copolymer (EVA) foaming material is given, and meanwhile, the defect of poor fit of the insole and the outsole/upper surface is brought, and the application of the ethylene and vinyl acetate copolymer (EVA) foaming material related shoe materials is seriously influenced.

Therefore, how to prepare the EVA foamed shoe material has the characteristics of light weight, high elasticity, good weather resistance and the like, so that the application range of the ethylene-vinyl acetate copolymer (EVA) foamed material is expanded, and the preparation method is very important.

Chinese patent CN103554649B discloses an odorless flame-retardant environment-friendly EVA foamed shoe material, which is prepared from ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated paraffin, antimony trioxide, aluminum hydroxide, stearic acid, zinc oxide, an odorless bridging agent, a high-temperature foaming agent, titanium dioxide and color master batch.

Chinese patent CN103194018B discloses a leisure shoe sole. The anti-shrinkage EVA foaming shoe material comprises the following raw materials: ethylene-vinyl acetate copolymer, polyolefin block copolymer, ethylene-octene copolymer, linear low density polyethylene, talcum powder, stearic acid, zinc stearate, zinc oxide, dicumyl peroxide, azodicarbonamide and color master batch. Mixing dicumyl peroxide and an azo foaming agent for later use, mixing the other raw materials, pouring the mixture into an internal mixer for first-stage internal mixing, adding the mixture of dicumyl peroxide and the azo foaming agent, and performing second-stage internal mixing to obtain an internally mixed mixture; thinning the obtained banburying mixture on a roller machine; conveying the uniformly mixed materials of the roller machine into a granulator for granulation; mixing the granulated granules according to a set multiplying power, injecting the granules into a shoe mold through an injection molding machine for molding; and (5) shaping the formed sole into a finished foamed section through a constant temperature box.

Disclosure of Invention

Aiming at the problems, the invention provides an EVA foaming shoe material and a preparation method thereof.

The technical scheme adopted by the invention for solving the problems is as follows: an EVA foaming shoe material is prepared from the following raw materials in parts by weight: 52 to 72 parts of maleic anhydride grafted EVA resin, 8.5 to 12.5 parts of ethylene-octene copolymer, 2.2 to 5.2 parts of magnesium carbonate, 0.3 to 1.3 parts of benzenesulfonyl hydrazide, 0.2 to 0.8 part of dicumyl peroxide, 0.6 to 1.6 parts of diaminocyclohexane, 1.2 to 3.2 parts of modified nano titanium dioxide and 1.4 to 4.4 parts of filler. The EVA foaming shoe material has the advantages that the characteristics of light weight and convenience in use of the EVA foaming shoe material can be kept by blending the maleic anhydride grafted EVA resin and the ethylene-octene copolymer, the elasticity and toughness of the EVA foaming shoe material can be improved by adding the modified nano titanium dioxide, the hardness and weather resistance of the EVA foaming shoe material can be enhanced by adding the filler, and the EVA foaming shoe material is suitable for being used in various environments.

Further, the EVA foaming shoe material is prepared from the following raw materials in parts by weight: 56 to 70 portions of maleic anhydride grafted EVA resin, 9.0 to 11.5 portions of ethylene-octene copolymer, 2.8 to 4.8 portions of magnesium carbonate, 0.5 to 1.1 portions of benzenesulfonyl hydrazide, 0.4 to 0.6 portion of dicumyl peroxide, 0.8 to 1.4 portions of diaminocyclohexane, 1.8 to 3.0 portions of modified nano titanium dioxide and 1.8 to 4.0 portions of filler.

Further, the EVA foaming shoe material is prepared from the following raw materials in parts by weight: 64 parts of maleic anhydride grafted EVA resin, 10.4 parts of ethylene-octene copolymer, 3.8 parts of magnesium carbonate, 0.8 part of benzenesulfonyl hydrazide, 0.5 part of dicumyl peroxide, 1.2 parts of diaminocyclohexane, 2.5 parts of modified nano titanium dioxide and 2.6 parts of filling agent.

Further, the filler is prepared from stearic acid, corn fiber, ceramic particles, nano zinc oxide, superfine calcium carbonate and palmitic acid according to a mass ratio of 1: 2.2: 0.8: 1.5: 2.5: 2.0-3.0. Stearic acid and corn fiber are added into the filling agent to improve the compatibility and stability of the EVA foaming shoe material, the elasticity is enhanced, the ceramic particles and the nano zinc oxide are added to supplement the performance of the maleic anhydride grafted EVA resin, the hardness and toughness are enhanced, and the superfine calcium carbonate and the palmitic acid are added for assistance, so that the stable performance and the long service life of the EVA sole material are ensured.

Still further, the filler is prepared from stearic acid, corn fiber, ceramic particles, nano zinc oxide, superfine calcium carbonate and palmitic acid according to a mass ratio of 1: 2.2: 0.8: 1.5: 2.5: 2.5.

Further, the preparation method of the modified nano titanium dioxide comprises the following steps: preparing the nano titanium dioxide into a dispersion liquid with the mass fraction of 15-25%, then adding water glass, dropwise adding 0.2-0.5 mol/L acetic acid solution, grinding and dispersing for 3-5 min, then carrying out heat preservation reaction for 1-3 h at the temperature of 35-45 ℃, and finally carrying out suction filtration and drying to obtain the modified nano titanium dioxide.

Further, in the preparation method of the modified nano titanium dioxide, the proportion of the nano titanium dioxide, the water glass and the acetic acid solution is 10 g: 2.5 g-3.5 g: 0.5mL to 1.5 mL.

The invention also aims to provide a preparation method of the EVA foaming shoe material, which comprises the following steps:

step one, adding the maleic anhydride grafted EVA resin, the ethylene-octene copolymer, the modified nano titanium dioxide and the filler in parts by weight into an internal mixer, and mixing for 8-12 min at the temperature of 95-115 ℃ to obtain a primary mixture;

and step two, adding the magnesium carbonate, benzenesulfonyl hydrazide, dicumyl peroxide and diaminocyclohexane in parts by weight into the primary mixture obtained in the step one, continuously mixing for 3-6 min at the temperature of 110-125 ℃, then transferring into a granulator for granulation, and finally obtaining the EVA foamed shoe material through foaming.

Furthermore, in the second step, the granulation length is 1.5 mm-2.5 mm.

The invention has the advantages that:

(1) according to the EVA foaming shoe material, the maleic anhydride grafted EVA resin has good elasticity and weather resistance, and is good in compatibility with the insole and the outsole when being used as a sole material, and the EVA foaming shoe material obtained by adding the modified nano titanium dioxide and the filler has moderate hardness, good wear resistance and comfort and high practicability;

(2) in the preparation process of the EVA foaming shoe material, the maleic anhydride grafted EVA resin is blended by the modified nano titanium dioxide and the filler, so that the resin performance is further improved, the weather resistance and the mechanical property of the EVA foaming shoe material are improved, and the applicability is wide;

(3) the EVA foamed shoe material prepared by the invention has the advantages of reasonable material selection, simple preparation method, lower production cost and high economic value.

Detailed Description

The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.