阅读说明：本技术 一种休闲鞋中底及休闲鞋中底制备方法 (Leisure shoe insole and preparation method thereof ) 是由 李少仲 李秉仲 李塞仲 于 2021-07-22 设计创作，主要内容包括：本申请涉及休闲鞋的领域,具体公开了一种休闲鞋中底及休闲鞋中底制备方法。休闲鞋中底的制备原料按重量份计,包括乙烯-醋酸乙烯共聚物60-100份、三元乙丙橡胶10-20份、硬脂酸锌10-20份、硅灰石1-3份、纳米碳化硅0.5-3份、芦荟提取物3-10份、聚氨基酸0.05-0.15份；其制备方法包括混炼、密封饱和、发泡、成型等制备步骤；休闲鞋为带有前述的休闲鞋中底的休闲鞋。本申请休闲鞋中底具有较高的弹性及优异的耐黄变性能。(The application relates to the field of casual shoes, and particularly discloses a casual shoe insole and a preparation method thereof. The preparation raw materials of the leisure shoe insole comprise, by weight, 60-100 parts of ethylene-vinyl acetate copolymer, 10-20 parts of ethylene propylene diene monomer, 10-20 parts of zinc stearate, 1-3 parts of wollastonite, 0.5-3 parts of nano silicon carbide, 3-10 parts of aloe extract and 0.05-0.15 part of polyamino acid; the preparation method comprises the preparation steps of mixing, sealing saturation, foaming, molding and the like; the leisure shoe is provided with the leisure shoe insole. The leisure shoe insole has higher elasticity and excellent yellowing resistance.)

1. The leisure shoe insole is characterized by comprising, by weight, 60-100 parts of ethylene-vinyl acetate copolymer, 10-20 parts of ethylene propylene diene monomer, 10-20 parts of zinc stearate, 1-3 parts of wollastonite, 0.5-3 parts of nano silicon carbide, 3-10 parts of aloe extract and 0.05-0.15 part of polyamino acid.

2. The leisure shoe midsole according to claim 1, characterized in that: the polyamino acid is a mixture of polyglutamic acid and polylysine.

3. The leisure shoe midsole according to claim 2, characterized in that: the weight ratio of the polyglutamic acid to the polylysine is (1-3) to 2.

4. The leisure shoe midsole according to claim 1, characterized in that: the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 19-40 wt%.

5. The leisure shoe midsole according to claim 1, characterized in that: the preparation raw materials also comprise 2-5 parts of baicalein.

6. The leisure shoe midsole according to claim 1, characterized in that: the particle size of the wollastonite is 800-2000 meshes.

7. The leisure shoe midsole according to claim 1, characterized in that: the grain diameter of the nano silicon carbide is 30-100 nm.

8. The method of manufacturing a leisure shoe midsole according to any one of claims 1 to 7, characterized by comprising the steps of:

s1, putting the ethylene-vinyl acetate copolymer and the ethylene propylene diene monomer rubber into an internal mixer for mixing for 20-40min, then adding the zinc stearate, the wollastonite, the nano silicon carbide, the aloe extract and the polyamino acid for further mixing for 10-20min, extruding and drying to obtain an internal mixed material;

s2, irradiating the internal mixing material by using an electron beam radiator, then placing the internal mixing material into a reaction kettle, introducing nitrogen into the reaction kettle, adjusting the pressure of the reaction kettle to be 30-50MPa and the temperature to be 40-70 ℃, sealing and saturating for 5-8h, then relieving pressure and taking the material, and foaming the taken material at the temperature of 100-120 ℃ to obtain a foaming material;

and S3, forming the foaming material to obtain the leisure shoe midsole.

Technical Field

The application relates to the field of casual shoes, in particular to a casual shoe insole and a preparation method thereof.

Background

The sole of the finished leisure shoe sold in the market at present generally consists of a rubber-plastic outer sole, a middle sole and an insole. The insole material mainly comprises a Phylon material, an EVA material and the like. The nylon material is light, has the advantages of high elasticity and tearing resistance, but is generally high in price and not beneficial to environmental protection. Although the EVA material is cheap, it has poor elasticity and environmental protection performance, so more and more researchers are working on the research of high-performance midsole materials.

For example, Chinese patent with application number 2017107148751 proposes an environment-friendly EVA (ethylene vinyl acetate) shoe midsole, which is prepared from 100 parts of EVA, or a blend of EVA and POE, or a blend of EVA and SEBS, or a blend of EVA, POE and SEBS, 0-2 parts of a sensitizer, 0.1-20 parts of calcium carbonate, 10100.5-2 parts of an antioxidant, 0.1-2 parts of an antibacterial agent ZnO, 0.1-10 parts of titanium dioxide and 0.1-2 parts of a dye; the EVA content in the EVA and POE blend is 60-95% and the POE content is 5-40%, and the EVA content in the EVA and SEBS blend is 60-95% and the SEBS content is 5-40%; the blend of EVA, POE and SEBS had an EVA content of 60%, an SEBS content of 30% and a POE content of 10%. The shoe middle sole made by the related patents has excellent environmental protection performance.

In view of the related art in the above, the inventors found in practical use that: the light color insole made of the insole still has the yellowing phenomenon after being aired in sunlight for many times.

Disclosure of Invention

In order to improve the yellowing resistance of the shoe insole, the application provides a leisure shoe insole and a preparation method of the leisure shoe insole.

In a first aspect, the present application provides a leisure shoe midsole, which adopts the following technical scheme:

a leisure shoe insole is prepared from 60-100 parts by weight of ethylene-vinyl acetate copolymer, 10-20 parts by weight of ethylene propylene diene monomer, 10-20 parts by weight of zinc stearate, 1-3 parts by weight of wollastonite, 0.5-3 parts by weight of nano silicon carbide, 3-10 parts by weight of aloe extract and 0.05-0.15 part by weight of polyamino acid.

By adopting the technical scheme, the formula of this application preparation raw materials to the playshoes insole is adjusted, wherein the nanometer carborundum that adds has better dispersibility and higher chemical stability, it is higher with ethylene-vinyl acetate copolymer, the compatibility of EPT rubber, can improve the stability in playshoes insole after adding, the aloe extract can absorb the ultraviolet ray, and the joining of polyamino acid can with nanometer carborundum, aloe extract coordinated action, the possibility of the yellow stain of playshoes insole under ultraviolet irradiation has been reduced, the yellowing resistance ability in playshoes insole has been improved.

Preferably, the polyamino acid is a mixture of polyglutamic acid and polylysine.

Preferably, the weight ratio of the polyglutamic acid to the polylysine is (1-3): 2.

By adopting the technical scheme, the polyglutamic acid and the polylysine are compounded, and when the weight ratio of the polyglutamic acid to the polylysine is (1-3):2, the yellowing resistance of the prepared leisure shoe insole is improved.

Preferably, the content of the vinyl acetate in the ethylene-vinyl acetate copolymer is 19-40 wt%; more preferably, the content of the vinyl acetate in the ethylene-vinyl acetate copolymer is 28-32 wt%.

By adopting the technical scheme, the content of the vinyl acetate in the ethylene-vinyl acetate copolymer is adjusted, and when the content of the vinyl acetate in the ethylene-vinyl acetate copolymer is 28-32 wt%, the yellowing resistance of the prepared leisure shoe insole is improved.

Preferably, the preparation raw materials of the leisure shoe insole also comprise 2-5 parts of baicalein.

By adopting the technical scheme, the baicalein contains conjugated tricomponents, can absorb ultraviolet rays, can interact with the aloe extract, further reduces the yellowing possibility of the insole of the leisure shoe under the irradiation of the ultraviolet rays, and improves the yellowing resistance of the insole of the leisure shoe.

Preferably, the particle size of the wollastonite is 800-2000 meshes.

Preferably, the particle size of the nano silicon carbide is 30-100 nm; more preferably, the nano silicon carbide has a particle size of 50 nm.

By adopting the technical scheme, when the particle size of the nano silicon carbide is 50nm, the dispersibility of the nano silicon carbide in a preparation system of the leisure shoe insole is strong, the coordination effect among the polyamino acid, the nano silicon carbide and the aloe extract is strong, and the yellowing resistance of the leisure shoe insole is improved.

In a second aspect, the application provides a method for preparing a midsole of a leisure shoe, which adopts the following technical scheme:

a preparation method of a leisure shoe insole comprises the following preparation steps:

s1, putting the ethylene-vinyl acetate copolymer and the ethylene propylene diene monomer rubber into an internal mixer for mixing for 20-40min, then adding the zinc stearate, the wollastonite, the nano silicon carbide, the aloe extract and the polyamino acid for further mixing for 10-20min, extruding and drying to obtain an internal mixed material;

s2, irradiating the internal mixing material by using an electron beam radiator, then placing the internal mixing material into a reaction kettle, introducing nitrogen into the reaction kettle, adjusting the pressure of the reaction kettle to be 30-50MPa and the temperature to be 40-70 ℃, sealing and saturating for 5-8h, then relieving pressure and taking the material, and foaming the taken material at the temperature of 100-120 ℃ to obtain a foaming material;

and S3, forming the foaming material to obtain the leisure shoe midsole.

Through adopting above-mentioned technical scheme, this application is adjusted to the formula of playshoes insole preparation raw materials, and polyamino acid and nanometer carborundum, aloe extract coordinated action have improved the resistant yellowing performance in playshoes insole.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the formula of the raw materials for preparing the insole of the leisure shoe is adjusted, and the polyamino acid, the nano silicon carbide and the aloe extract are coordinated, so that the possibility of yellowing of the insole of the leisure shoe under ultraviolet irradiation is reduced, and the yellowing resistance of the insole of the leisure shoe is improved;

2. the nano silicon carbide with the particle size of 50nm is preferably adopted, the dispersity of the nano silicon carbide in a preparation system of the insole of the casual shoe is high, the coordination effect among the polyamino acid, the nano silicon carbide and the aloe extract is high, and the yellowing resistance of the insole of the casual shoe is improved;

3. the compound of polyglutamic acid and polylysine is preferably adopted in the application, and the weight ratio of the polyglutamic acid to the polylysine is (1-3) to 2, so that the yellowing resistance of the middle sole of the leisure shoe is improved.

Detailed Description

The present application will be described in further detail with reference to the following examples, and the sources of the raw materials used in the present application are shown in Table 1 unless otherwise specified.

TABLE 1 sources of raw materials used in the present application

Examples

Example 1

A leisure shoe insole is prepared by the following preparation steps:

s1, putting 80g of ethylene-vinyl acetate copolymer and 15g of ethylene propylene diene monomer rubber into an internal mixer, mixing for 30min at 140 ℃, then cooling to 100 ℃, adding 15g of zinc stearate, 2g of wollastonite, 2g of nano silicon carbide, 8g of aloe extract and 0.1g of polyamino acid, continuously mixing for 10min, extruding and drying to obtain an internal mixing material;

s2, irradiating the internal mixing material by using an electron beam radiator, setting the irradiation amount to 80kGy, then putting the irradiated internal mixing material into a reaction kettle, introducing nitrogen into the reaction kettle, adjusting the pressure of the reaction kettle to 40MPa and the temperature to 50 ℃, sealing and saturating for 7 hours, then releasing pressure and taking the material, and foaming the taken material at 110 ℃ for 10 minutes to obtain a foaming material;

s3, putting 45g of foaming material into a corresponding insole die for steam hot-pressing forming, wherein the steam pressure is 2MPa, and the hot-pressing time is 50S, so as to obtain the leisure insole;

the particle size of the used wollastonite is 800 meshes; the grain diameter of the used nano silicon carbide is 30 nm; the polyamino acid is polylysine; the content of vinyl acetate in the ethylene-vinyl acetate used was 19 wt%.

Examples 2 to 9

Examples 2 to 9 are based on example 1 and differ from example 1 only in that: the preparation conditions of the leisure shoe insole are different, and are specifically shown in table 2.

TABLE 2 preparation conditions of the leisure shoe midsoles of examples 1 to 9

Example 10

Example 10 is based on example 1 and differs from example 1 only in that: the content of vinyl acetate in the ethylene-vinyl acetate copolymer was 28 wt%.

Example 11

Example 11 is based on example 1 and differs from example 1 only in that: the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 32 wt%.

Example 12

Example 12 is based on example 1 and differs from example 1 only in that: the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 40 wt%.

Example 13

Example 13 is based on example 12 and differs from example 12 only in that: the polyamino acid is polyglutamic acid.

Example 14

Example 14 is based on example 13 and differs from example 13 only in that: the polyamino acid is a mixture of polyglutamic acid and polylysine, and the weight ratio of the polyglutamic acid to the polylysine is 1: 2.

Example 15

Example 15 is based on example 14 and differs from example 14 only in that: the weight ratio of polyglutamic acid to polylysine used was 3: 2.

Example 16

Example 16 is based on example 15 and differs from example 15 only in that: the particle size of the wollastonite used is 1000 meshes.

Example 17

Example 17 is based on example 15 and differs from example 15 only in that: the particle size of the used wollastonite is 2000 meshes.

Example 18

Example 18 is based on example 15 and differs from example 15 only in that: the particle size of the used wollastonite was 1250 mesh.

Example 19

Example 19 is based on example 18 and differs from example 18 only in that: the grain diameter of the used nano silicon carbide is 100 nm.

Example 20

Example 20 is based on example 18 and differs from example 18 only in that: the grain diameter of the used nano silicon carbide is 50 nm.

Example 21

Example 21 is based on example 20 and differs from example 20 only in that: 5g of baicalein, which has a purity of 99% and is purchased from Tianmen Henchang chemical Co., Ltd, was added simultaneously when the aloe extract was added in the step S1.

Example 22

Example 22 is based on example 20 and differs from example 20 only in that: 2g of baicalein, which has a purity of 99% and is purchased from Tianmen Henchang chemical Co., Ltd, was added simultaneously when the aloe extract was added in the step S1.

Comparative example

Comparative example 1

Comparative example 1 is based on example 1 and differs from example 1 only in that: wollastonite with equal mass is used for replacing the nano silicon carbide.

Comparative example 2

Comparative example 2 is based on example 1 and differs from example 1 only in that: the aloe extract is replaced by nano silicon carbide with equal mass.

Comparative example 3

Comparative example 3 is based on example 1 and differs from example 1 only in that: equal mass of aloe extract was used instead of polylysine.

Comparative example 4

Comparative example 4 is based on example 1 and differs from example 1 only in that: the dosage of the ethylene propylene diene monomer is 30g, and the dosage of the ethylene-vinyl acetate copolymer is 120 g.

Comparative example 5

Comparative example 5 is based on example 21 and differs from example 21 only in that: equal mass of baicalein is substituted for aloe extract.

Performance test

The following performance tests were performed on the leisure shoe midsoles obtained in examples 1 to 22 and comparative examples 1 to 5, respectively.

And (3) yellowing resistance test: according to the specification of the method A in HG/T3689-2001 (shoe yellowing resistance test method), the yellowing resistance grades of the leisure shoe midsoles prepared in the examples 1-22 and the comparative examples 1-5 are respectively tested, the grading is carried out according to the 5-grade color (color card) gradient standard established by the American textile color chemistry Association, the grading is carried out according to the standard color card, the higher the grade is, the better the yellowing resistance is, the test temperature is 50 ℃, the irradiation time is 6h, and the test result is shown in Table 3.

And (3) resilience testing: the rebound rates of the leisure shoe midsoles obtained in examples 1 to 22 and comparative examples 1 to 5 were measured using a GT-7042-RE type impact resilience tester, and the results are shown in Table 3.

And (3) testing tensile strength: the tensile strength of the leisure shoe midsoles obtained in examples 1 to 22 and comparative examples 1 to 5 was measured according to the provisions of GB/T528-2009 (determination of tensile stress strain properties of vulcanized rubber or thermoplastic rubber), and the test results are shown in Table 3.

TABLE 3 test results of the midsole of examples 1 to 22 and comparative examples 1 to 5

Analysis of the data shows that the rebound rate of the midsole of the leisure shoe prepared by the method is not lower than 60%, the tensile strength is not lower than 4MPa, and the yellowing resistance grade is not lower than 3, so that the prepared leisure shoe has excellent elasticity and yellowing resistance, and analysis of the data of examples 1-9 shows that example 1 is the best example among examples 1-9.

Analyzing the data of the example 1 and the comparative examples 1 to 4, it can be seen that when any one of the nano silicon carbide, the aloe extract and the polyamino acid is not added, the yellowing resistance of the prepared leisure shoe insole is obviously reduced, and the rebound resilience is also reduced, which indicates that the nano silicon carbide in the application has better dispersibility and higher chemical stability, has higher compatibility with ethylene-vinyl acetate copolymer and ethylene propylene diene monomer, can improve the stability of the leisure shoe insole after being added, the aloe extract can absorb ultraviolet rays, the addition of the polyamino acid can coordinate with the nano silicon carbide and the aloe extract, reduce the yellowing possibility of the leisure shoe insole under ultraviolet irradiation, and improve the yellowing resistance of the leisure shoe insole.

Analysis of the data of examples 12 and 10-11 shows that the yellowing resistance of the midsole of the leisure shoe obtained by the present application is improved by adjusting the vinyl acetate content of the ethylene-vinyl acetate copolymer to 28-32 wt%.

Analysis of the data of examples 14 to 15 and examples 13 and 12 revealed that the yellowing resistance of the midsole of the leisure shoe manufactured using polyglutamic acid or polylysine alone as the polyamino acid was lower than that of the midsole of the leisure shoe manufactured using a mixture of polyglutamic acid and polylysine as the polyamino acid, indicating that the yellowing resistance of the midsole of the leisure shoe manufactured using polyglutamic acid and polylysine in combination was higher when the weight ratio of polyglutamic acid to polylysine was (1-3): 2.

Analysis of the data of example 20, example 19 and example 18 revealed that the yellowing resistance of the produced midsole was improved when the nano-silicon carbide had a particle size of 50nm, indicating that the nano-silicon carbide having a particle size of 50nm had a high dispersibility in the system for producing a midsole for a leisure shoe, and that the synergy between the polyamino acid, the nano-silicon carbide and the aloe vera extract was high, thereby improving the yellowing resistance of the midsole for a leisure shoe.

As can be seen from the analysis of the data of examples 21 to 22 and examples 20 and comparative example 5, when 2 to 5 parts of baicalein, which contains conjugated trivinyl, was added to the raw materials for the preparation of the leisure shoe midsole, the anti-yellowing performance of the prepared leisure shoe midsole was improved, and the anti-yellowing performance of the leisure shoe midsole was improved by the interaction with the aloe extract.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.