CN115746256A

CN115746256A - TPU sole material, manufacturing process thereof and heel-shaped sole

Info

Publication number: CN115746256A
Application number: CN202211487232.5A
Authority: CN
Inventors: 周春蓉; 金丽娜; 林纯纯
Original assignee: Zhejiang Aokang Shoes Co Ltd
Current assignee: Zhejiang Aokang Shoes Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-03-07

Abstract

The invention relates to a TPU sole material, a manufacturing process thereof and a heel-shaped sole, wherein the TPU sole material comprises the following components in parts by weight: polyol: 65-75 parts; 15-25 parts of diphenylmethane diisocyanate; 1, 4-butanediol: 3-7 parts of a stabilizer; antioxidant: 0.2 to 0.5 portion; and a lubricant: 0.2 to 0.5 portion; the manufacturing process comprises the following steps: firstly, adding 65g to 75g of polyol, 15g to 25g of diphenylmethane diisocyanate, 3g to 7g of 1, 4-butanediol, 0.2g to 0.5g of antioxidant and 0.2g to 0.5g of lubricant into an internal mixer to prepare a mixture; secondly, transferring the mixture prepared in the first step into a mould for foaming, and naturally cooling after foaming to obtain a semi-finished product; and thirdly, spraying paint with the required color on the semi-finished product obtained in the second step, and naturally drying the semi-finished product to form the TPU sole material.

Description

TPU sole material, manufacturing process thereof and heel-shaped sole

Technical Field

The invention relates to the technical field of shoe materials, in particular to a TPU sole material, a manufacturing process thereof and a heel-shaped sole.

Background

In the prior art, common sole materials include a cowhells sole, a rubber sole, a vulcanized sole, an EVA sole and a PU sole.

The ox tendon bottom is a yellowish semitransparent sole, and its colour is similar with the ox tendon, and the sole of this kind of material often elasticity is fine, comfortable and easy to wear, has better wear-resisting, waterproof, anti-skidding effect, can protect the step well when wearing to walk, has walked for a long time and also can not feel too tired. The main disadvantage of the tendon bottom is that it is too heavy.

The molded heel outsole in the market at present is mainly made of rubber. The sole made of natural rubber or synthetic rubber has good elasticity, corrosion resistance, wear resistance and water resistance. However, the rubber outsole generally has a heavier foot, the paint spraying effect time of the formed sole heel is long and is easy to fall off, and the anti-aging detection of the sole is easy to fail to reach the standard.

The vulcanized sole is produced with rubber as basic material, fabric or leather as upper, and through the processes of sticking, molding, glue injection, etc. the rubber sole and sulfur are cross-linked under certain pressure and temperature to combine the sole and the shoe body closely.

EVA is a high molecular material, and the more vinyl acetate contained therein, the better the elasticity. It is commonly used for manufacturing soles of jogging shoes, leisure shoes and foot training shoes.

The PU bottom is also called polyurethane bottom and is made of polyurethane through foaming. Foam rubber-based high density durable materials are often used in the midsole of the hind sole because of their light weight, superior wear resistance, and are widely used in the manufacture of leisure shoe soles. The PU substrate is light in weight and wear-resistant, but is expensive and high in cost.

Disclosure of Invention

The invention aims to provide a TPU sole material and a manufacturing process thereof, and aims to solve the technical problems of how to increase the comfort level of an outsole, ensure that the paint spraying effect of the heel part of the outsole is not easy to fall off, and ensure that the weight of a finished shoe is lighter and the shoe is more comfortable.

The invention aims to overcome the defects in the prior art and provides a TPU sole material which comprises the following components in parts by weight:

polyol: 65-75 parts of a stabilizer;

15-25 parts of diphenylmethane diisocyanate (MDI);

1, 4-butanediol: 3-7 parts;

antioxidant: 0.2 to 0.5 portion; and

lubricant: 0.2 to 0.5 portion.

Preferably, the polyol is a linear polyol having a molecular weight of 700 to 2000.

Preferably, the alcohol group of the linear polyol has two or more hydroxyl groups (-OH).

Preferably, the linear polyol has 6 to 12 carbon atoms and one or more phosphorus atoms.

Preferably, the antioxidant comprises an amine antioxidant and a phenolic antioxidant, wherein the ratio of the amine antioxidant to the phenolic antioxidant is 1-1.6 to 1 in parts by weight.

Preferably, the amine antioxidant is N-alkylated phenylenediamine, phenyl-a-naphthylamine or alkylated phenyl-naphthylamine.

Preferably, the phenolic antioxidant is 4, 4-butylidene bis (3-methyl-6-tert-butylphenol) or 2, 2-methylene bis (4-methyl-6-tert-butylphenol).

Preferably, the lubricant is a mixture of polyalkylene glycol (PAG), polyoxyalkylene phenol, and dioctylaniline.

Another aspect of the present application provides a manufacturing process of a TPU sole material, including the following steps:

firstly, adding 65g-75g of polyol, 15g-25g of diphenylmethane diisocyanate (MDI), 3g-7g of 1, 4-butanediol, 0.2g-0.5g of antioxidant and 0.2g-0.5g of lubricant into an internal mixer to prepare a mixture;

secondly, transferring the mixture prepared in the first step into a mould for foaming, and naturally cooling after foaming to obtain a semi-finished product;

and thirdly, spraying the color of the needed paint on the heel part of the semi-finished product obtained in the second step, and naturally drying the semi-finished product to form the TPU sole material.

The application still provides the TPU that does not fall lacquer with type sole, should form by foretell TPU sole material preparation with type sole.

Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

the TPU sole material is very suitable for manufacturing heel-shaped soles, can lighten the weight of the soles, has good compressibility, prevents paint from falling off, and has the effects of wear resistance and tear resistance, so that the service life of the shoes can be prolonged better.

The sole made of the TPU sole material has good stability and aging resistance, good plasticity and can prevent the paint spraying effect from falling off.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic view of the structure of a heel-type footwear sole according to the present invention.

Detailed Description

The present invention is described in more detail below to facilitate an understanding of the present invention.

The TPU sole material disclosed by the invention comprises the following components in parts by weight:

polyol: 65-75 parts;

15-25 parts of diphenylmethane diisocyanate (MDI);

1, 4-butanediol: 3-7 parts of a stabilizer;

antioxidant: 0.2 to 0.5 portion; and

lubricant: 0.2 to 0.5 portion.

Preferably, the antioxidant comprises an amine antioxidant and a phenolic antioxidant, wherein the mass part ratio of the amine antioxidant to the phenolic antioxidant is 1-1.6 to 1.

Preferably, the amine antioxidant is an N-alkylated phenylenediamine, phenyl-A-naphthylamine or alkylated phenyl-naphthylamine.

The manufacturing process of the TPU sole material comprises the following steps:

and thirdly, spraying the color of the needed paint on the heel part of the semi-finished product obtained in the second step, and naturally airing to form the TPU sole material.

For comparative testing purposes, the applicant has conducted a number of comparative tests in which representative test data are shown in the following table.

Example 1

Example 2

Example 3

Comparative example 1

Comparative example 2

Comparative example 3

Comparative example 4

Polyhydric alcohols

65g

75g

70g

0g

75g

70g

65g

MDI

15g

25g

20g

15g

25g

20g

15g

1, 4-butanediol

3g

7g

5g

3g

7g

5g

0g

Antioxidant agent

0.2g

0.5g

0.3g

0.2g

0g

0.3g

0.2g

Lubricant agent

0.2g

0.5g

0.3g

0.2g

0.5g

0g

0.2g

Sorbitol

0g

65g

0g

Example 1 is 25% lighter than comparative example 1, 3% lighter than comparative example 2, 2% lighter than comparative example 3 and 5% lighter than comparative example 4 in terms of weight. Example 2 is 26% lighter than comparative example 1, 3.4% lighter than comparative example 2, 3% lighter than comparative example 3, and 6% lighter than comparative example 4. Example 3 is 26.7% lighter than comparative example 1, 4% lighter than comparative example 2, 2.6% lighter than comparative example 3, and 7% lighter than comparative example 4.

From the compressive property, example 1 was 15% better than comparative example 1, 13% better than comparative example 2, 8% better than comparative example 3, and 6% better than comparative example 4. Example 2 was 12% better than comparative example 1, 1.4% better than comparative example 2, 2.3% better than comparative example 3, and 4.6% better than comparative example 4. Example 3 was 11.7% better than comparative example 1, 1.4% better than comparative example 2, 1.6% better than comparative example 3, and 2.7% better than comparative example 4.

From the viewpoint of the effect of preventing the paint from falling off, the paint of example 1 fell 128 times later than in comparative example 1, 18 times later than in comparative example 2, 9 times later than in comparative example 3, and 32 times later than in comparative example 4 under the same aging test conditions. Example 2 the paint shed 135 times later than in control 1, 24 times later than in control 2, 6 times later than in control 3, and 41 times later than in control 4. Example 3 the paint was released 142 times later than control 1, 26 times later than control 2, 11 times later than control 3, and 37 times later than control 4.

In addition, during the tests, the applicant has found that the use of both amine antioxidants and phenolic antioxidants allows to obtain unexpected technical effects.

In the prior art, an amine antioxidant or a phenolic antioxidant is usually used alone, and the effect of the amine antioxidant or the phenolic antioxidant is only antioxidation. However, in the process of one test, the applicant adds the amine antioxidant and the phenol antioxidant into the raw materials simultaneously due to misoperation to prepare the mixture, and the experimental result shows that unexpected technical effects are achieved in the aspects of reducing weight and preventing the paint from falling off.

The applicant then carried out a number of tests and found that, in the case of all the other ingredients being the same, the simultaneous use of the amine antioxidant and the phenolic antioxidant results in a weight reduction of 72.6% and a paint shedding time 17.9 times later, compared with the use of the amine antioxidant alone; compared with the single use of the phenolic antioxidant, the weight is reduced by 76.4 percent, and the paint shedding time is 24.3 times later.

Heretofore, the applicant has focused attention on the improvement of the polyol, and has not recognized at all that the use of both amine antioxidants and phenolic antioxidants can reduce weight and prevent paint peeling. There is also no technical teaching in the prior art of the ability to reduce weight and prevent paint shedder by the use of both amine and phenolic antioxidants. Therefore, the above-mentioned technical effects are completely unexpected and are unexpected.

Through further experiments, the applicant found that the ratio of the mass parts of the amine antioxidant to the phenolic antioxidant is 1 to 1.6 to 1, the effects in terms of weight reduction and prevention of paint falling are optimum, and that the effects beyond the above range are not prominent, although some effects are obtained.

As shown in figure 1, the invention also provides a TPU heel type sole 1 without paint dropping, and the heel type sole is made of the TPU sole material.

The TPU disclosed by the invention belongs to an environment-friendly material, has extremely strong toughness, has the characteristics of excellent high tensile force and high tension, has higher strength compared with other plastic materials, and also has the characteristics of oil resistance, cold resistance and aging resistance, and has a certain resistance to ultraviolet rays and bacteria. The TPU material is added to the shoe outsole with the formed sole, so that the comfort level of the outsole can be increased, the paint spraying effect of the heel part of the outsole is not prone to falling off, and the shoe is lighter and more comfortable to put on the foot.

The foregoing describes preferred embodiments of the present invention, but is not intended to limit the invention thereto. Modifications and variations of the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the invention.

Claims

1. The TPU sole material is characterized by comprising the following components in parts by weight:

polyol: 65-75 parts;

15-25 parts of diphenylmethane diisocyanate;

1, 4-butanediol: 3-7 parts of a stabilizer;

antioxidant: 0.2 to 0.5 portion; and

lubricant: 0.2 to 0.5 portion.

2. The TPU sole material of claim 1, wherein the polyol is a linear polyol having a molecular weight of between 700 and 2000.

3. The TPU sole material of claim 2, wherein the linear polyol has two or more hydroxyl groups in the alcohol group.

4. The TPU sole material of claim 2, wherein the linear polyol has from 6 to 12 carbon atoms and one or more phosphorus atoms.

5. The TPU sole material of claim 1, wherein the antioxidant comprises an amine antioxidant and a phenolic antioxidant, wherein the ratio of the amine antioxidant to the phenolic antioxidant is 1 to 1.6 to 1 parts by weight.

6. The TPU sole material of claim 5, wherein the amine antioxidant is N-alkylated phenylenediamine, phenyl-A-naphthylamine, or alkylated phenyl-naphthylamine.

7. The TPU sole material of claim 5, wherein the phenolic antioxidant is 4, 4-butylidenebis (3-methyl-6-tert-butylphenol) or 2, 2-methylenebis (4-methyl-6-tert-butylphenol).

8. The TPU sole material of claim 1, wherein the lubricant is a mixture of polyalkylene glycol (PAG), polyoxyalkylene phenol, and dioctylaniline.

9. The process for making the TPU sole material of any of claims 1 through 8 comprising the steps of:

firstly, adding 65g to 75g of polyol, 15g to 25g of diphenylmethane diisocyanate, 3g to 7g of 1, 4-butanediol, 0.2g to 0.5g of antioxidant and 0.2g to 0.5g of lubricant into an internal mixer to prepare a mixture;

and thirdly, spraying paint with the required color on the heel part of the semi-finished product obtained in the second step, and naturally airing to form the TPU sole material.

10. A TPU heel type shoe sole without dropping paint, characterized in that the TPU heel type shoe sole without dropping paint is made of the TPU shoe sole material according to any one of claims 1 to 8 or the TPU shoe sole material obtained by the process for making the TPU shoe sole material according to claim 9.