CN215913514U

CN215913514U - Hydrolysis-resistant sneaker upper

Info

Publication number: CN215913514U
Application number: CN202121555183.5U
Authority: CN
Inventors: 李民; 蔡相成; 杨卉艳
Original assignee: Shanghai HIUV Applied Materials Technology Co Ltd; Shanghai HIUV New Materials Co Ltd
Current assignee: Shanghai HIUV Applied Materials Technology Co Ltd; Shanghai HIUV New Materials Co Ltd
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2022-03-01
Anticipated expiration: 2031-07-08

Abstract

The utility model provides a hydrolysis-resistant sneaker upper. The hydrolysis-resistant sports shoe upper sequentially comprises lining fabric, a sponge layer and cross-linked polyolefin artificial leather from inside to outside, various different materials are bonded by glue and sewn, and the supporting sheet is added between the sponge layer and the cross-linked polyolefin artificial leather at the toe cap part and the heel part. The cross-linked polyolefin artificial leather does not contain active groups such as ester groups, amide groups, halogens and the like which are easy to generate hydrolysis reaction, so that the cross-linked polyolefin artificial leather has good hydrolysis resistance, and the polyolefin layer forms an interpenetrating cross-linked network through cross-linking, so that the hydrolysis resistance of the shoe upper is enhanced.

Description

Hydrolysis-resistant sneaker upper

Technical Field

The utility model relates to the field of sports shoe materials, in particular to a hydrolysis-resistant sports shoe upper.

Background

The sports shoes are based on the comprehensive requirements of high strength, light weight and high hydrolysis resistance, and the synthetic leather with high hydrolysis resistance is required to be used as a raw material for production. The upper is in direct contact with the sole, so that the requirement on hydrolysis resistance is highest. At present, the leather for the upper usually adopts polyurethane resin and polyvinyl chloride, the hydrolysis resistance of the polyurethane resin is poor, and the resin layer naturally falls off after being soaked for 24 hours at room temperature; the hydrolysis-resistant leather made of the PVC resin has small loss of peel strength, but the PVC surface is hard after being soaked in water. Therefore, the selection of an upper for sports shoes which can achieve excellent hydrolysis resistance becomes a focus of research.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hydrolysis-resistant sneaker upper, which sequentially comprises lining fabric, sponge and cross-linked polyolefin artificial leather from inside to outside, wherein different materials are bonded by using an adhesive and are sewn, and supporting sheets are added between a sponge layer and the cross-linked polyolefin artificial leather at the toe cap part and the heel part.

The lining fabric for the sports upper comprises one of knitted fabric, mesh fabric and non-woven fabric.

The sponge layer used for the sports upper is made of one of PU foam and EVA foam.

The cross-linked polyolefin artificial leather is formed by compounding cross-linked polyolefin and base cloth and coating a polyurethane coating on one side back to the base cloth.

The cross-linked polyolefin can be a multilayer structure, and the material is selected from one or more of polyethylene, ethylene and alpha-olefin copolymer, polypropylene and propylene and alpha-olefin copolymer; the crosslinking means is one of thermal crosslinking or radiation crosslinking.

The polyolefin molecular structure does not contain active groups such as ester groups, amide groups, halogens and the like which are easy to generate hydrolysis reaction, so that the polyolefin has good hydrolysis resistance; the polyolefin has relatively low melting point and flexibility, so that good embossing is conveniently formed through surface texture treatment; the polyolefin has low density and is suitable for lightweight upper products. Through crosslinking, the polyolefin layer forms an interpenetrating crosslinked network, so that the wear resistance, the adhesion and the hydrolysis resistance of the material are enhanced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

The shaded portion in fig. 1 is a schematic view of the position of an upper of a hydrolysis-resistant sneaker provided by an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of an upper of a hydrolysis-resistant athletic shoe according to an embodiment of the present invention.

1-crosslinked polyolefin artificial leather

2-adhesive

3-base cloth layer

4-base cloth

Detailed Description

The utility model provides a hydrolysis-resistant upper, which is of a three-layer structure and sequentially comprises the following components from bottom to top: base cloth layer, crosslinked polyolefin layer, polyurethane layer. The crosslinked polyolefin layer may be a single layer or a multi-layer structure.

As an example of the base fabric layer, one selected from the group consisting of knitted fabric, needle punched fabric, polyester fabric, nonwoven fabric, woven fabric, and stretch fabric may be used.

Examples of polyolefins may be selected from one or more of polyethylene, ethylene and alpha-olefin copolymers, polypropylene, propylene and alpha-olefin copolymers.

The polyolefin layer is a single-layer or multi-layer structure, and the multi-layer structure comprises one or two of a non-foaming layer or a foaming layer.

In some embodiments, the polyurethane layer is selected from one of a waterborne polyurethane layer, a solvent-borne polyurethane layer, and a solvent-free polyurethane layer.

The obtained leather sample is subjected to crosslinking degree and hydrolysis resistance tests, and the method comprises the following steps:

and (3) hydrolysis resistance testing: and (3) placing the upper sample into a 15% NaOH aqueous solution, soaking for one day at the temperature of 25 ℃, respectively testing the peeling strength of the base cloth layer and the resin layer before and after soaking, and calculating the loss rate of the peeling strength.

Degree of crosslinking: the procedure is as defined in DIN EN ISO-10147.

Example 1

The upper of the hydrolysis-resistant sports shoe sequentially comprises knitted fabric, PU sponge and cross-linked polyolefin artificial leather from inside to outside. The cross-linked polyolefin artificial leather is a base cloth and polyethylene composite layer, and polyurethane is coated on one side of the polyethylene, which is back to the base cloth, wherein the cross-linking mode is heat cross-linking.

Example 2

The hydrolysis-resistant sneaker upper sequentially comprises screen cloth, EVA sponge and cross-linked polyolefin artificial leather from inside to outside. The cross-linked polyolefin artificial leather is a base cloth and ethylene-octene copolymer composite layer, and one side of the ethylene-octene copolymer, which is back to the base cloth, is coated with polyurethane, and the cross-linking mode is radiation cross-linking.

Example 3

The hydrolysis-resistant sneaker upper sequentially comprises non-woven fabric, PU sponge and cross-linked polyolefin artificial leather from inside to outside. The cross-linked polyolefin artificial leather is a composite layer of base cloth and a polyethylene and ethylene-octene copolymer co-extruded product, and polyurethane is coated on one side of the co-extruded polymer product, which is back to the base cloth, wherein the cross-linking mode is radiation cross-linking.

Example 4

The hydrolysis-resistant sneaker upper sequentially comprises non-woven fabric, EVA sponge and cross-linked polyolefin artificial leather from inside to outside. The cross-linked polyolefin artificial leather is a composite layer of base cloth and an ethylene-butene copolymer and ethylene-octene copolymer co-extruded matter, polyurethane is coated on one side of the co-extruded polymer matter, which is back to the base cloth, and the cross-linking mode is heat cross-linking.

Comparative example 1

The structure of the hydrolysis resistant athletic shoe upper is the same as in example 3, except that no crosslinking is performed.

Comparative example 2

The structure of the upper of hydrolysis-resistant sports shoes differs from that of example 4 only in that the cross-linked polyolefin artificial leather is replaced with polyvinyl chloride.

Table 1 examples comparative example test results

Item	Example 1	Example 2	Example 3	Example 4	Comparative example 1	Comparative example 2
							Degree of crosslinking%	10	90	78	82	0	0
Loss of peel strength%	20	3	4	4	25	37

As can be seen from the data of the examples and comparative examples, the present invention provides better hydrolysis resistance to the upper of the athletic shoe.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto. Those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the present disclosure, and such modifications or substitutions are intended to be included within the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. The hydrolysis-resistant sneaker upper comprises lining fabric, sponge and cross-linked polyolefin artificial leather from inside to outside in sequence, various different materials are bonded by using an adhesive and are sewn, and supporting pieces are added between a sponge layer and the cross-linked polyolefin artificial leather at the toe cap part and the heel part.

2. The upper of a hydrolysis resistant athletic shoe of claim 1, wherein the lining fabric for the athletic upper comprises one of a knitted fabric, a mesh fabric, and a non-woven fabric.

3. The upper of a sports shoe resistant to hydrolysis according to claim 1, wherein the sponge layer for the upper of a sports shoe is made of one of PU foam and EVA foam.

4. The hydrolysis-resistant athletic shoe upper according to claim 1, wherein the cross-linked polyolefin artificial leather is compounded with the base fabric from cross-linked polyolefin and a polyurethane coating is applied to a side facing away from the base fabric.

5. The upper of hydrolysis resistant athletic footwear according to claim 4, wherein the cross-linked polyolefin is a multi-layer structure selected from one or more of polyethylene, a copolymer of ethylene and α -olefin, polypropylene, and a copolymer of propylene and α -olefin; the crosslinking means is one of thermal crosslinking or radiation crosslinking.