Layered leather with polymer coating and its preparation

 

(57) Abstract:

The invention relates to light industry to the production of multi-layer skin with a polymer coating. Layered leather with polymer coating includes a fibrous base material with a bulk density 0,19-0,24 g/cm3of polyester fibers and polypropylene or polyester and polyester shrinkable fibers, taken in the ratio of 7-8,5:3-1,5, the linear density of each of these fibers is 0.12-0.33 Tex; and layers of adhesive, porous PVC-based and solid-based polyetherurethane, with the penetration of the adhesive layer of the fibrous base at a depth of 3-10% of its thickness, with the formation of the adhesion-fibrous layer and a porous layer in the adhesion-fibrous layer at a depth of 3-7% of the thickness ratio of layers of a fibrous base, adhesive-fibrous layer, porous and monolithic layers respectively 1:(0,25-1):(0,75-3):(0,25-1,5). Multi-layer leather is produced by alternately applying to one side of the specified bases adhesive, porous and monolithic layers, ensuring that heat treatment of the adhesive and the porous layer at a temperature of 130-160S, porous at a temperature of 180-230S, artificial leather is scored deformations, improving the abrasion resistance, of shape. 2 c.p. f-crystals, 2 tab.

The invention relates to light industry, the production of multi-layer skin with a polymer coating.

Known multi-layer leather with PVC porous monolithic coating made of fibrous bases from natural fibers and yarns. Dry skin is characterized satisfactory strength properties, but has a high rigidity, lack of operational properties, GOST 28143-89 “Viniliskozha-HT Shoe”.

Known multi-layer skin, including non-woven base impregnated with a polymeric binder on the basis of aqueous copolymer dispersions of butadiene and Acrylonitrile, with non-woven backing thickness 1-3,0 mm weighing 200-450 g/m2contains needle-punched layer of cellulose and synthetic fibers, the ratio of the impregnated nonwoven substrate and the front layer is 0.5 to 0.9:0,1-1,2 (EN 1263191 A, CL A 06 N 3/00, 1984).

The disadvantage of this multilayer faux leather is of poor appearance, the appearance on the skin surface relief fiber basis, stitched synthetic filaments, low adhesion polymer layer to the fiber is.12.1998 In this technical solution multilayer skin contains fibrous basis of haloprogin canvases, facial polymer layer, made on the basis of elastic polymers, with fibrous base formed of 2-4 layers haloprogin canvases, each of which is bonded tufting yarn linear density 22-32 Tex of nylon or polyester, with a total surface density of canvases 400-700 g/m2the depth of penetration facial polymer layer impregnated fibrous base is 0,15-0,7 from its thickness and the relief pattern formed by embossing, has a height of protrusions of 0.3-0.9 mm and the frequency of 150-350 per 10 cm2square, the ratio of layer thickness: fibrous base, a layer of a polymeric binder, facial polymer layer is 1:(0,1-0,5):(0,2-0,5).

Polymer coating in this technical solution has high adhesion to fibrous, however, the material has poor appearance that it is not possible to obtain a multilayer skin with a thin polymer coating and appearance under natural leather.

The purpose of this invention to provide a multilayer faux leather with a thin polymer coating, with the appearance under natural is Csanyi resistance to abrasion, of shape,

This goal is achieved by the fact that multi-layered leather includes a fibrous base material with a bulk density 0,19-0,24 g/cm3consisting of polyester and polypropylene fibers or polyester and polyester shrinkable fibers, taken in the ratio of 7-8,5:3-1,5 with a linear density of each of these fibers is 0.12-0.33 Tex, an adhesive layer obtained by applying a polymer coating based on polyvinyl chloride, penetrating to a depth of fibrous basis 3-10% of its thickness, the porous layer of polyvinyl chloride, penetrating 3-7% of the thickness of the adhesive fibrous layer and solid layer on the basis of polyetherurethane when the ratio of these layers 1:(0,25-1):(0,75-3):(0,25-1,5) respectively.

A method of obtaining a multi-layer of the skin, consisting in applying to one side of a fibrous substrate with a bulk density 0,19-0,24 g/cm3consisting of polyester and polypropylene fibers, or polyester and polyester shrinkable fibers, taken in the ratio of 7-8,5:3-1,5 with a linear density of each of these fibers is 0.12-0.33 Tex, an adhesive layer obtained by applying a polymer coating based on polyvinyl chloride, penetrating to a depth of fibrous bases 3 and monolithic layer based on polyetherurethane with providing heat treatment of adhesive coatings and monolithic layer at a temperature of 130-160S, the porous layer at a temperature of 180-230S.

The use of fibrous basis of a mixture of polyester and polypropylene shrink fibers or polyester and polyester shrinkable fibers having a linear density of 0.12-0.33 Tex and taken in the ratio of 7-8,5(polyester fiber):3-1,5(shrinkage fiber), promotes uniform mutual interlocking mechanical method of formation of the canvas with the formation of a variety of superficial contacts. Shrinkage of the fibers during further heat treatment of the fibrous framework provides the basis of bulk density is 0.19-0.24 g/cm3with the lowest ratio of large pores in the interfibrillar space and an increased number of micropores due to the closer contact between the fibers of the substrate and produce a dense structure of the substrate with isotropic properties.

The resulting structure of the fibrous framework allows to form the adhesive polymer layer so that it penetrates into the fibrous base at a depth of 3-10% of its thickness with the formation of adhesive-fibrous layer, which in the future, thanks to the uniform distribution of the polymer binder provides the necessary dimensional stability, deformation-strength properties, the th, providing the necessary bonding strength between the layers due to partial penetration of the adhesive-layer fiber 3-7% of its thickness.

A set of features related to the formation of the front surface, provides the necessary complex of physical and mechanical properties of multilayer artificial leather.

The invention allows to obtain a multilayer skin with a thin polymer coating, with the appearance under natural leather, with high-strain-strength properties, resistance to repeated strains, improved abrasion resistance and dimensional stability.

In the invention used the following components and materials:

fiber - fiber polyester GOST 13231-77; fiber polypropylene shrink THE 2272-05766614-93; fiber shrinkage polyester THAT 6-06-28-30-87.

Polymers for polymer coatings of adhesive, porous and monolithic layers: PVC brand EP 6602, EP 6206, polyvinyl chloride brand With 70 - GOST 14039-78; solutions polyetherurethane brand “Vitur” RBS 22 - TU 6-55-51-91.

Plasticizers: platogo type - DAP - di-N-alkyltin 789, DOP di-2-ethylhexylphthalate, DOS - di-2-ethylhexylamine - GOST 8728-77;

Dispersant - Las calcium - TU 6-01-959-77.

The pore-forming - diazocarbonyl - CHS-21 TU 6-08-408-76.

Fillers: chalk GOST 8258-72; titanium dioxide GOST 9808-75; carbon black technical GOST 7885-77. Pigments: GOST 6220-76, THE 6-10-602-77.

The invention is illustrated by examples of specific performance and table.2.

Multilayer skin was obtained as follows: on the fibrous base material with a bulk density 0,19-0,24 g/cm2consisting of polyester and polypropylene shrinkage fibers, taken in the ratio of 7-8,5:3-1,5, or of polyester and polyester shrinkable fibers, taken in the ratio of 7-8,5:3-1,5 with a linear density of each of these fibers is 0.12-0.33 Tex, put the adhesive layer and the porous layer based on polyvinyl chloride, and a monolithic layer based on polyetherurethane.

The compositions of the adhesive, porous and monolithic layers are presented in table. 1.

After applying the adhesive and monolithic layers are heat-treated at a temperature of 130-160S and porous at a temperature of 180-230S, while the adhesive layer is completely penetrates into the fibrous base at a depth of 3-10% of its tooknote basis, adhesive-fibrous, porous and monolithic layers respectively 1:(0,25-1):(0,75-3):(0,25-1,5). After heat treatment on the surface of the polymer layer is applied relief.

The invention is illustrated in the examples.

Example 1. Material properties are presented with the minimum value of all the claimed features. As the fibrous basis use non-woven base consisting of polyester and polypropylene fibers.

Example 2. Same as in example 1, the material properties are presented with the average of all the claimed features.

Example 3. Same as in example 2, however, the fibrous non-woven backing is made of polyester and polyester shrinkable fibers.

Example 4. Same as in example 1, the properties of the material presented at the maximum value of all declared attributes.

Example 5. Same as in example 1, the properties of the material presented at the output of the minimum value of all the claimed features.

Example 6. Same as in example 1, the properties of the material presented at the output of the maximum value of all the claimed features.

Example 7, 8. Same as in example 5,6, however, the fibrous base is and what otnesti fibrous basis is: for example 9-0,18 g/cm3example 10-0,25 g/cm3with an average value of all the claimed features.

Example 11. Same as in example 2, the material properties are presented with the average of all of the declared characteristics, however, the ratio of polyester and polypropylene fibers is 6,5:3,5.

Example 12. Same as in example 2, the material properties are presented with a ratio of polyester and polypropylene fibers 8,7:1,3.

Example 13, 14. Same as in examples 11 and 12, the material properties obtained when using a fibrous base, made of polyester and polyester shrinkable fibers.

Example 15, 16. Same as in example 2, the material properties obtained when using a fibrous base, made according to example 12, with an average ratio of fibres and with a linear density. Example 15-0,11 Tex, example 16-0,35 Tex.

Example 17, 18. Same as in examples 15, 16. Material properties are presented when using a fibrous base, consisting of polyether and polyester shrinkable fibers.

Example 19, 20. Same as in example 2, however, the penetration depth of the adhesive layer of the fibrous base: for example 18-2,8% (example 19 within 10,5%.

Example 21, 22. Same as in examples 19, 20. Properties is cnyh fibers.

Example 23, 24. Same as in example 2, however, the porous layer penetrates into the adhesive fibrous layer to the depth of its thickness: for example 23-2,5%, for example 24-7,5%.

Example 25, 26. Same as in examples 23, 24. Material properties are presented when using a fibrous base, consisting of polyether and polyester shrinkable fibers.

Example 27. Same as in example 2, however, the ratio of the fibrous base, adhesive-fibrous, porous and monolithic layers respectively: 1:2,10:0,87:3,2.

Example 28. Same as in example 27. Material properties are presented when using a fibrous base, consisting of polyether and polyester shrinkable fibers.

As can be seen from the table. 2, the claimed technical solution allows to obtain a multilayer skin with good appearance under natural leather, high abrasion resistance, satisfactory dimensional stability, reduced rigidity index. This material has good water vapor permeability and the required deformation-strength properties. This solution allows you to expand the range of domestic high-quality materials for manufacturing shoes of different models">

1. Layered leather comprising a fibrous base material with a bulk density 0,19-0,24 g/cm3consisting of polyester and polypropylene fibers or polyester and polyester shrinkable fibers, taken in the ratio of 7-8,5:3-1,5, with a linear density of each of these fibers is 0.12-0.33 Tex; an adhesive layer obtained by applying a polymer coating based on polyvinyl chloride, penetrating to a depth of fibrous basis 3-10% of its thickness, the porous layer of polyvinyl chloride, penetrating 3-7% of the thickness of the adhesion-fibrous layer and solid layer on the basis of polyetherurethane when the ratio of these layers 1:(0,25-1):(0,75-3):(0,25-1,5) respectively.

2. A method of obtaining a multilayer skin under item 1, which consists in applying to one side of a fibrous substrate with a bulk density 0,19-0,24 g/cm3consisting of polyester and polypropylene fibers, or polyester and polyester shrinkable fibers, taken in the ratio of 7-8,5:3-1:5 with a linear density of each of these fibers is 0.12-0.33 Tex, an adhesive layer obtained by applying a polymer coating based on polyvinyl chloride, penetrating to a depth of fibrous basis 3-10% of its thickness, the porous layer of polyvinyl chloride, has entered the m heat treatment of adhesive coatings and monolithic layer at a temperature of 130-160S, the porous layer at a temperature of 180-230S.

 

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