CN210031286U

CN210031286U - Novel EVA synthetic leather structure

Info

Publication number: CN210031286U
Application number: CN201920227380.0U
Authority: CN
Inventors: 李民; 李庆北; 蔡相成
Original assignee: Shanghai Haiyou Wei Applied Materials Technology Co Ltd
Current assignee: Shanghai Haiyou Wei Applied Materials Technology Co Ltd
Priority date: 2019-02-20
Filing date: 2019-02-20
Publication date: 2020-02-07
Anticipated expiration: 2029-02-20

Abstract

The utility model relates to a novel EVA synthetic leather structure, wherein the structure from the bottom up of synthetic leather includes base cloth, radiation cross-linked EVA layer, surface grafting processing layer, polyurethane layer in proper order. Contrast polyvinyl chloride or polyurethane synthetic leather on the existing market, adopt the utility model discloses a synthetic leather structure, the EVA layer and the base cloth bonding strength of radiation cross-linking are high, can further promote the adhesion stress on polyurethane layer and EVA layer at the EVA layer surface coating graft processing layer of radiation cross-linking, and manufacturing process is simple, and low in production cost waits advantage, can extensively be used for fields such as vamp, case and bag, sofa, house ornamentation.

Description

Novel EVA synthetic leather structure

Technical Field

The utility model relates to a synthetic leather technical field specifically indicates a novel EVA synthetic leather structure.

Background

With the increasing living standard of people, people put forward higher and higher quality requirements on living goods. Leather, as an article of daily use, has been increasingly demanded not only in the market but also in various requirements (including environmental protection performance, inherent physical strength requirement, durability requirement, solvent resistance requirement, etc.) of customers in recent years. Because the genuine leather can produce a large amount of pollution in the manufacturing process, and meanwhile, the production cost is higher, the durability is relatively poor, the surface physical property is relatively low, the maintenance is difficult and other inherent defects exist, and the potential requirement of high quality of people cannot be met. Synthetic leather has been developed to the present, and because of its advantages such as relatively excellent performance and relatively low cost, it has been used in the manufacture of shoes, bags, sofas, and garments in a large quantity, and the synthetic leather industry has become the support industry of the light industry.

At present, the structure of the whole synthetic leather is built on a base layer which takes Polyurethane (PU) or polyvinyl chloride (PVC) as a main body, a large amount of organic solvents and plasticizers, such as dimethylformamide, methyl ethyl ketone, acetone, toluene, ethyl acetate, o-benzene plasticizers and the like, are used in the production process, and the materials have great harm to human bodies or the environment.

Therefore, it is a hot research to find a new more environmentally friendly synthetic leather structure to replace Polyurethane (PU) or polyvinyl chloride (PVC) synthetic leather structures. EVA is a rubber-like thermoplastic having excellent flexibility, low-temperature flexibility, elasticity, stress crack resistance, and good moldability, processability, etc., and is widely used. The ethylene-vinyl acetate copolymer greatly improves the comprehensive physical properties of EVA (ethylene-vinyl acetate) after radiation crosslinking, such as rebound resilience, aging resistance, temperature resistance, solvent resistance and the like, and synthetic leather with EVA as a base material structure has fewer reports.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming above-mentioned prior art's shortcoming, providing a novel EVA synthetic leather structure, radiation crosslinking EVA layer is high with base cloth bonding strength, can further promote the adhesive force on polyurethane wear-resisting layer and EVA layer at the surface coating grafting processing layer on EVA layer, and manufacturing process is simple, advantages such as low in production cost. The structure comprises a radiation crosslinking EVA layer, and the EVA is thermoplastic plastics similar to rubber, has excellent flexibility, low-temperature flexibility, elasticity and stress cracking resistance, and has good plasticity, processability and the like, and is widely applied. After radiation crosslinking, the comprehensive physical properties of EVA, such as rebound resilience, aging resistance, temperature resistance, solvent resistance and the like, are greatly improved.

In order to realize the above purpose, the utility model discloses a novel EVA synthetic leather structure has following constitution:

the novel EVA synthetic leather structure sequentially comprises a base cloth, a radiation cross-linked EVA layer, a surface grafting treatment layer and a polyurethane layer from bottom to top.

Preferably, the base fabric is any one of knitted elastic fluffed fabric, plain-woven fluffed fabric, knitted plain fabric, polyester filament yarn elastic fabric, non-woven fabric, woven polyester fabric, nylon fabric or microfiber base fabric.

Preferably, the EVA layer is subjected to radiation crosslinking treatment.

Preferably, the novel EVA synthetic leather structure is characterized in that the total thickness of the novel EVA synthetic leather is 0.5-5.5 mm.

Preferably, the total thickness of the novel EVA synthetic leather is 0.7-4.0 mm.

Preferably, the thickness of the base fabric is 0.3 to 2.2 mm.

Preferably, the thickness of the base fabric is 0.44-1.8 mm.

Preferably, the thickness of the radiation-crosslinked EVA layer is 0.19-3.0 mm.

Preferably, the thickness of the radiation crosslinking ethylene vinyl acetate copolymer (EVA) layer is 0.25-2.0 mm.

Preferably, the thickness of the polyurethane layer is 0.005-0.04 mm.

Preferably, the thickness of the polyurethane layer is 0.01-0.02 mm.

Preferably, the thickness of the polyurethane layer is 0.005-0.26 mm.

Preferably, the thickness of the polyurethane layer is 0.01-0.18 mm.

Adopt the utility model discloses a novel synthetic leather structure, EVA layer and base cloth bonding strength are high, can further promote the adhesion stress on polyurethane wear-resisting layer and EVA layer at the surface coating surface grafting processing layer on EVA layer, and manufacturing process is simple, advantages such as low in production cost. The structure comprises an EVA layer, wherein the EVA is thermoplastic plastics similar to rubber, has excellent flexibility, low-temperature flexibility, elasticity and stress cracking resistance, and has good plasticity, processability and the like, and is widely applied. After radiation crosslinking, the comprehensive physical properties of EVA, such as rebound resilience, aging resistance, temperature resistance, solvent resistance and the like, are greatly improved.

Drawings

Figure 1 is the structure schematic diagram of the synthetic leather structure of the utility model.

Reference numerals

1 base cloth

2 radiation crosslinking Ethylene Vinyl Acetate (EVA) layer

3 surface graft treatment layer

4 polyurethane layer

Detailed Description

In order to more clearly describe the technical content of the present invention, the following further description is given with reference to specific embodiments.

As shown in figure 1, the utility model provides a novel synthetic leather structure from the bottom up is base cloth, EVA layer, surface grafting processing layer, polyurethane layer in proper order. The method specifically comprises the following steps:

processing the base cloth;

melting and casting EVA resin on a base cloth;

crosslinking the EVA layer through irradiation treatment;

coating a grafting treatment layer on the other surface of the EVA layer opposite to the base cloth

And coating a polyurethane wear-resistant layer on the surface of the grafting treatment layer.

And finally, carrying out conventional treatment procedures of the rear section of the synthetic leather such as color changing, grain kneading and the like. And obtaining the novel EVA synthetic leather structure.

The novel EVA synthetic leather structure with different thicknesses shown in the table I is adopted.

Watch 1

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. The novel EVA synthetic leather structure is characterized by sequentially comprising a base cloth, a radiation cross-linked EVA layer, a surface grafting treatment layer and a polyurethane layer from bottom to top.

2. The novel EVA synthetic leather structure of claim 1, wherein the base fabric, the radiation crosslinked EVA layer, the surface graft treatment layer and the polyurethane layer form a four-layer synthetic leather.

3. The novel EVA synthetic leather structure of claim 1, wherein the total thickness of the novel EVA synthetic leather is 0.5-5.5 mm, the thickness of the base fabric is 0.3-2.2 mm, the thickness of the radiation crosslinked EVA layer is 0.19-3.0 mm, the thickness of the surface grafting treatment layer is 0.005-0.04 mm, and the thickness of the polyurethane layer is 0.005-0.26 mm.