CN114232356A

CN114232356A - Leather product and leather fabric and preparation process thereof

Info

Publication number: CN114232356A
Application number: CN202111588771.3A
Authority: CN
Inventors: 赖雄生; 孔小玲; 孔汝婷
Original assignee: Guangzhou Angel Kiss Leather Co ltd
Current assignee: Guangzhou Angel Kiss Leather Co ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-03-25

Abstract

The invention discloses a leather fabric, which comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom; the base fabric is a weft knitting double-sided structure formed by interweaving cotton yarns and metaplexis japonica fibers; the fabric front side of the base fabric is compounded with a foaming layer, and the fabric front side is of a coil raised line structure consisting of a plurality of loose large coil longitudinal rows formed by the cotton yarns and a plurality of compact small coil longitudinal rows formed by the ascleed down fibers. The fluffy and soft fabric is formed by the special base fabric structure, the fabric has fluffy hand feeling, good elasticity and compact structure, the softness of the base fabric is greatly increased, and the fluffy and soft fabric has good fluffy elongation. Under this base cloth structure, the fabric openly is compound with PVC expanded material, and the loose big coil wale and the inseparable little coil wale that the fabric was openly make the base cloth structure fluffy and elongation good, and fluffy elongation is good more in the base cloth structure can give PVC synthetic leather high compliance, also lets user's subjective compliance sense of touch better.

Description

Leather product and leather fabric and preparation process thereof

Technical Field

The invention belongs to the technical field of artificial leather, and particularly relates to leather fabric and a preparation process thereof.

Background

The technology of PVC artificial leather was first developed in the last 30 centuries, and with the continuous development of new coating materials and filling materials and the optimization and improvement of synthesis processes, PVC synthetic leather is gradually becoming the best choice to replace natural leather and is widely used in leatherware, leather bags, leather shoes, automotive interiors and other artificial leather products.

Currently, PVC artificial leather has difficulty in expressing a texture comparable to that of natural leather due to lack of softness and toughness. In the art, softness is improved mainly by increasing the amount of plasticizer, which causes environmental problems and other product defects.

Chinese patent publication No. CN110857533A discloses a soft artificial leather for automobile interior materials, which comprises a polymer plasticizer, a PVC resin and a foaming agent, and a method for manufacturing the same. The soft artificial leather for automobile interior materials comprises a skin layer containing a PVC resin and a primary plasticizer, wherein the skin layer further comprises more than 0 and not more than 15phr of a polymer plasticizer. Therefore, it has the effects of reducing the heating loss and suppressing the migration of the plasticizer. The method overcomes the defects caused by the increase of the dosage of the plasticizer, reduces the heating loss and inhibits the migration.

Although the negative effects brought by the plasticizer are improved in the prior art, the problem of environmental protection still exists in the high dosage of the plasticizer.

The invention patent of China with publication number CN109881494A discloses an artificial leather with high softness and hydrolysis resistance for vehicles and a preparation method thereof, wherein the artificial leather consists of a surface treatment agent layer, a surface layer, a foaming layer, a glue layer and a base fabric layer which are sequentially distributed from top to bottom. The artificial leather is prepared by premixing the skin slurry and the foaming slurry, preparing a PVC artificial leather semi-finished product by a release paper coating method, coating the PVC artificial leather semi-finished product with a surface treating agent layer, and embossing at high temperature to obtain the artificial leather.

The mode that prior art passes through composite bed structure chooses the polyurethane material for use as the epidermal layer complex on PVC foaming material, has given comfortable feeling, high compliance and the high wearability of product, but the income of PU material makes the preparation technology of PVC synthetic leather loaded down with trivial details relatively and complicated, and has greatly improved the cost of PVC synthetic leather, is not convenient for popularize and use.

In conclusion, new technical means for developing and preparing a PVC artificial leather with high softness still remain to be provided.

Disclosure of Invention

The invention aims to solve the technical problems that the existing PVC artificial leather lacks softness, and the existing technology for improving the softness has high cost or is not environment-friendly, and provides the PVC artificial leather with low cost and high softness with environmental protection.

In order to solve the problems, the invention is realized according to the following technical scheme:

in a first aspect, the invention provides a leather fabric, which comprises a surface layer, a foaming layer and a base fabric, wherein the surface layer, the foaming layer and the base fabric are sequentially compounded from top to bottom;

the base fabric is a weft knitting double-sided structure formed by interweaving cotton yarns and metaplexis japonica fibers;

the fabric front side of the base fabric is compounded with a foaming layer, and the fabric front side is of a coil raised line structure consisting of a plurality of loose large coil longitudinal rows formed by the cotton yarns and a plurality of compact small coil longitudinal rows formed by the ascleed down fibers.

With reference to the first aspect, the present invention further provides a 1 st preferred embodiment of the first aspect, specifically, the fabric back surface of the base fabric is a small loop structure composed of 1 cotton yarn and 1 metaplexis fiber, and the fabric back surface has multiple rows of compact small loop vertical rows arranged at intervals;

the loose large coil wales on the front surface of the fabric and the tight small coil wales formed by cotton yarns on the back surface of the fabric are correspondingly connected with each other and are tightened by hollow coffee carbon polyester fibers;

the compact small coil wales on the front side of the fabric and the compact small coil wales formed by the metaplexis down fibers on the back side of the fabric are correspondingly connected with each other and are tightened by the hollow coffee carbon polyester fibers.

With reference to the first aspect, the present invention further provides a second preferred embodiment of the first aspect, specifically, the multiple rows of loose large coil longitudinal rows and the multiple rows of tight small coil longitudinal rows are periodically distributed at intervals, one row is separated from another row, a tight small coil longitudinal row is sandwiched between loose large coil longitudinal rows of any two adjacent rows, and a loose large coil longitudinal row is sandwiched between tight small coil longitudinal rows of any two adjacent rows.

With reference to the first aspect, the present invention further provides a 3 rd preferred embodiment of the first aspect, specifically, the surface layer is made of PVC resin powder, a plasticizer, a stabilizer, a color paste, and a nano silica filler, and the polymerization degree of the PVC resin powder is 1600.

In combination with the first aspect, the present invention also provides a 4 th preferred embodiment of the first aspect, in particular, the nanosilica is treated with a silane coupling agent.

In combination with the first aspect, the present invention also provides a 5 th preferred embodiment of the first aspect, specifically, the plasticizer is acetyl epoxidized vegetable oil glyceride.

In combination with the first aspect, the present invention further provides a 6 th preferred embodiment of the first aspect, specifically, the foaming layer is made of PVC resin powder, an AC foaming agent, a plasticizer, a calcium zinc stabilizer, and calcium carbonate, and the degree of polymerization of the PVC resin powder is 1600;

wherein the plasticizer is acetyl epoxidized vegetable oil acid glyceride.

In combination with the first aspect, the present invention also provides a 7 th preferred embodiment of the first aspect, specifically, the outer surface of the surface layer is further coated with a silicone-modified polyurethane resin coating layer.

In a second aspect, the invention further provides a preparation process of the leather fabric of the first aspect, wherein the preparation process comprises the following steps:

(1) preparing base cloth and release paper, and preparing surface layer slurry and foaming layer slurry according to the following formula:

the surface layer is made of PVC resin powder, a plasticizer, a stabilizer, color paste and a nano silica filler;

the foaming layer is made of PVC resin powder, an AC foaming agent, a plasticizer, a calcium-zinc stabilizer and calcium carbonate;

the polymerization degree of the PVC resin powder is 1600, and the plasticizer is acetyl epoxidized vegetable oil glyceride;

(2) coating the prepared surface layer slurry on release paper, controlling the temperature to be 170-190 ℃, keeping for 5min, drying and cooling to form the surface layer;

(3) coating the prepared foaming layer slurry on the surface layer, then attaching the base cloth on the foaming layer slurry coating, and entering a high-temperature oven for high-temperature foaming plasticization, wherein the temperature is controlled to be 200-210 ℃, and the plasticizing foaming time is about 60-70S;

(4) surface treatment and graining.

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

the leather fabric comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom; the base fabric is a weft knitting double-sided structure formed by interweaving cotton yarns and metaplexis japonica fibers; the fabric front side of the base fabric is compounded with a foaming layer, and the fabric front side is of a coil raised line structure consisting of a plurality of loose large coil longitudinal rows formed by the cotton yarns and a plurality of compact small coil longitudinal rows formed by the ascleed down fibers.

The fluffy and soft fabric is formed by the special base fabric structure, the fabric has fluffy hand feeling, good elasticity and compact structure, the softness of the base fabric is greatly increased, and the fluffy and soft fabric has good fluffy elongation. Under this base cloth structure, the fabric openly is compound with PVC expanded material, and the loose big coil wale and the inseparable little coil wale that the fabric was openly make the base cloth structure fluffy and elongation good, and fluffy elongation is good more in the base cloth structure can give PVC synthetic leather high compliance, also lets user's subjective compliance sense of touch better.

Drawings

Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic view of the layer structure of the leather lining of the present invention;

FIG. 2 is a schematic representation of a partial fabric structure of the base fabric of the present invention;

in the figure:

10-surface layer;

20-a foamed layer;

30-base cloth.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example one

Adopt PVC synthetic leather to replace natural leather, can not only save the cost by a wide margin, but also can accomplish the effect of the similar genuine leather of outward appearance. The PVC artificial leather is prepared from PVC resin, plasticizer, stabilizer, flame retardant, foaming agent, surface treating agent and base cloth, wherein the base cloth is usually knitted cloth, non-woven cloth or microfiber cloth, and the production process is usually coating method and calendering method. The existing PVC artificial leather has the problem of lack of softness, and research hotspots in the field mainly focus on formula optimization of materials, such as improvement of a plasticizer, composite PU high polymer materials and the like in the prior art. However, the prior art has the problems of cost, environmental protection and the like, and is not a better improvement way.

The research of the applicant finds that the softness of the PVC artificial leather is relatively greatly influenced by the base fabric. Therefore, the invention provides a technical scheme for improving the high softness of the PVC artificial leather through the base fabric structure, the use amount of a plasticizer is not required to be increased, a PU high polymer material is not required to be added, the raw material composition of the PVC artificial leather is not required to be improved, and the PVC artificial leather is produced by a conventional process, so that the improvement scheme has the advantages of low cost and environmental protection, and the high softness of the PVC artificial leather is endowed.

As shown in fig. 1, the leather fabric comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom.

As shown in fig. 2, the base fabric is a weft-knitted double-sided structure formed by interweaving cotton yarns and metaplexis japonica fibers; the fabric front side of the base fabric is compounded with a foaming layer, and the fabric front side is of a coil raised line structure consisting of a plurality of loose large coil longitudinal rows formed by the cotton yarns and a plurality of compact small coil longitudinal rows formed by the ascleed down fibers.

The improvement mechanism of the invention is as follows: the fluffy and soft fabric is formed by the special base fabric structure, the fabric has fluffy hand feeling, good elasticity and compact structure, the softness of the base fabric is greatly increased, and the fluffy and soft fabric has good fluffy elongation. Under this base cloth structure, the fabric openly is compound with PVC expanded material, and the loose big coil wale and the inseparable little coil wale that the fabric was openly make the base cloth structure fluffy and elongation good, and fluffy elongation is good more in the base cloth structure can give PVC synthetic leather high compliance, also lets user's subjective compliance sense of touch better.

The base fabric comprises a large number of cavity structures formed by longitudinal rows of coils on a macro structure, and the macro deformation energy absorption is good, so that a user is more flexible in touch.

On the other hand, in terms of material selection, the cotton yarn and the metaplexis down fiber selected by the invention are all natural fibers, and have environmental protection. The asclepiadaceae velvet fiber has the structural characteristic of high hollowness, so that the asclepiadaceae velvet fiber has high filling degree, and the filling degree of the asclepiadaceae velvet fiber is measured to be 16.6cm according to the GB/T14272-2011 standard in a natural state. Through the method, the microstructure of the basic weft-knitted double-sided structure contains a plurality of yarn hollow cavity structures, and the hollow cavity structures formed by the wales of the coils are cooperated, so that macroscopic deformation energy absorption is better, subjective flexibility is caused, and higher softness evaluation is given to the PVC artificial leather.

In one specific implementation, the multiple rows of loose large coil longitudinal rows and the multiple rows of tight small coil longitudinal rows are periodically distributed at intervals of one row at intervals, a tight small coil longitudinal row is clamped between the loose large coil longitudinal rows of any two adjacent rows, and a loose large coil longitudinal row is clamped between the tight small coil longitudinal rows of any two adjacent rows.

Under this structure, the compliance that enables each position of PVC synthetic leather is even, guarantees that the user sense of touch is good. And as shown in the structural diagram of fig. 2, under the structure, the composite structure of the fabric front side and the PVC foam layer is more excellent.

In a preferred embodiment, as shown in fig. 2, the fabric back surface of the base fabric is a small loop structure consisting of 1 cotton yarn and 1 metaplexis japonica fiber, and the fabric back surface is provided with a plurality of rows of compact small loop wales arranged at intervals; the loose large coil wales on the front surface of the fabric and the tight small coil wales formed by cotton yarns on the back surface of the fabric are correspondingly connected with each other and are tightened by hollow coffee carbon polyester fibers; the compact small coil wales on the front side of the fabric and the compact small coil wales formed by the metaplexis down fibers on the back side of the fabric are correspondingly connected with each other and are tightened by the hollow coffee carbon polyester fibers.

The front and back surfaces of the base cloth are respectively provided with a coil raised line structure, the base cloth is endowed with excellent fluffiness, softness and warmth retention property in a synergetic mode, and the base cloth can be used for preparing leather products such as leather clothing, automobile seats and the like. On the other hand, the hollow coffee carbon polyester fiber enables the base cloth to be fine in structure, and improves the flexibility of the base cloth. The hollow coffee carbon polyester fiber has an obvious circular middle cavity structure, good energy absorption and high thermal stability, although the breaking strength and the initial modulus of the hollow coffee carbon polyester fiber are slightly reduced, the breaking elongation is increased, the tensile property of the polyester fiber is continued, and the structural strength of the base cloth is good.

In one embodiment, the cotton yarn is 11.8tex cotton yarn.

The core improvement of the patent is mainly based on the base cloth, and meanwhile, on the other hand, the invention also improves the flexibility of the PVC artificial leather through multiple aspects. In particular, in the first aspect, the PVC artificial leather is endowed with excellent softness and certain toughness by a specific weft-knitted double-sided fabric. On the other hand, the invention also improves the flexibility of the PVC artificial leather by the following technical means.

In one specific implementation, the surface layer is made of PVC resin powder, a plasticizer, a stabilizer, color paste and a nano silica filler, and the polymerization degree of the PVC resin powder is 1600. Wherein the components are compounded with nano silicon dioxide filler with the mass fraction of 5 percent.

According to the invention, the nano-silica filler with the mass fraction of 5% is added into the surface layer slurry of the conventional PVC artificial leather, and the nano-silica is used as the filler to toughen and modify the surface layer, so that the tensile strength of the PVC artificial leather is improved, the penetration degree of the PVC artificial leather (the smaller the penetration degree, the more uniform the filler is dispersed, and the better the flexibility of the material) is reduced, and meanwhile, the nano-silica filler is added in the surface layer slurry, so that the surface layer slurry also has the effect of smoothing the surface quality of the surface layer.

In one implementation, when preparing the surface layer slurry, the toughening agent is added into a container, then other auxiliary agents are added for stirring, then a part of PVC resin powder is slowly added, after the solution has certain viscosity, the standby nano silica filler is added, then the rest of PVC resin powder is added, and after stirring for a certain time, the PVC resin powder is fully dispersed and mixed to obtain the surface layer slurry.

In a preferred implementation, the nanosilica is treated with a silane coupling agent.

In a preferred embodiment, the plasticizer is acetyl epoxidized vegetable oil acid glyceride. By selecting HM-828, the compatibility with PVC is good, a certain compatibilization effect is generated during plasticization, and the HM-828 is cooperated with the nano-silica filler to improve the performance of the PVC artificial leather, so that the PVC artificial leather has higher tensile strength and good bonding force between the nano-silica filler and a substrate interface.

The facing layers described herein are well known in the art. The raw material composition of the surface layer slurry, the raw material combination and proportion of the PVC resin powder, the plasticizer, the stabilizer, and the color paste are common knowledge in the art, and the present invention is not limited thereto.

In one specific implementation, the foaming layer is made of PVC resin powder, an AC foaming agent, a plasticizer, a calcium-zinc stabilizer and calcium carbonate, and the polymerization degree of the PVC resin powder is 1600; wherein the plasticizer is acetyl epoxidized vegetable oil acid glyceride.

The polymerization degree of the PVC resin powder is not more than 1600, the polymerization degree of the PVC resin powder is increased, the relatively high processing temperature enables the PVC molecular chain and the plasticizer molecular chain to be fully compatible, the material is stiff and smooth in a macroscopic view and has an elastic effect, and the softness of the PVC artificial leather can be increased to a certain degree along with the increase of the polymerization degree. However, when the polymerization degree exceeds 1600, the softness is lowered.

The HM-828 and PVC are selected to have good compatibility, and a certain compatibilization effect is generated during plasticization, so that the material has high tensile strength, good uniformity of foam pores and ideal interface bonding force of calcium carbonate and a substrate.

The foamed layer of the present invention is well known in the art. The foaming layer slurry is prepared by the conventional process, wherein the raw material composition and the proportion of PVC resin powder, an AC foaming agent, a plasticizer, a calcium-zinc stabilizer and calcium carbonate are common knowledge in the field.

The invention also provides a preparation process of the leather fabric, which comprises the following steps:

the surface layer is made of PVC resin powder, a plasticizer, a stabilizer, color paste and a nano silica filler, wherein the nano silica filler with the mass fraction of 5% is added into the surface layer slurry;

(4) surface treatment and graining.

Hereinafter, specific embodiments will be described in more detail. These examples are provided for illustration only:

the product performance test of the PVC artificial leather:

example 1: this embodiment 1 leather material for leatherware includes surface course, foaming layer and base cloth that from top to bottom compound in proper order. The base fabric is the base fabric recorded in the embodiment.

the surface layer is prepared from the following raw materials in parts by weight: 100 parts of PVC resin powder, 70 parts of plasticizer, 5 parts of stabilizer, 10 parts of color paste and a proper amount of nano silica filler, wherein the nano silica filler with the mass fraction of 5 percent is added into the surface layer slurry;

the foaming layer is prepared from the following raw materials in parts by weight: 100 parts of PVC resin powder, 80 parts of plasticizer, 5 parts of AC foaming agent, 3 parts of calcium-zinc stabilizer and 15 parts of calcium carbonate;

(2) coating the prepared surface layer slurry on release paper, controlling the temperature to be 180 ℃, keeping for 5min, drying and cooling to form the surface layer;

(3) coating the prepared foaming layer slurry on the surface layer, then attaching the base cloth on the foaming layer slurry coating, and entering a high-temperature oven for high-temperature foaming and plasticizing, wherein the temperature is controlled at 200 ℃, and the plasticizing and foaming time is about 60S;

(4) surface treatment and graining.

Comparative example 1: the leather fabric of the leather in the comparative example 1 comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom. The base cloth is double-sided knitted cloth.

The preparation process and the raw material composition of the leather fabric of the leather are completely consistent with those of the example 1.

Comparative example 2: the leather fabric of the leather in the comparative example 2 comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom. The base cloth is warp-knitted cloth.

The preparation process and the raw material composition of the leather fabric for the leather are completely consistent with those of the example 1.

Comparative example 3: the leather fabric of the leather in the comparative example 3 comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom. The base cloth is loose knitted cloth.

Comparative example 4: the leather fabric of the leather in the comparative example 4 comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom. The base cloth is bidirectional elastic cloth.

Comparative example 5: the leather fabric of the leather in the comparative example 5 comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom.

The difference between the comparative example 5 and the example 1 is that the top layer slurry does not contain nano silica filler, and the preparation process and other raw material compositions of the leather facing material of the leather are completely consistent with those of the example 1.

Comparative example 6: the leather fabric of the leather of the comparative example 6 comprises a surface layer, a foaming layer and a base fabric which are sequentially compounded from top to bottom.

The comparative example 6 is different from the example 1 in that the surface layer slurry contains 5 mass percent of calcium carbonate filler, and the preparation process and other raw material compositions of the leather facing material of the leather are completely consistent with those of the example 1.

Softness performance test (one):

the samples of example 1, comparative examples 1-4 were tested:

1.1 main test equipment: a leather press-in rigidity tester; an annular softness tester; 45 degree slope tester.

1.2 test methods:

1.2.1 indentation stiffness: all samples were tested according to ISO 17235 standard with a 4.9mm indenter diameter, a 20mm hole diameter and a 530g load. The amount of deformation of the material is recorded and the results are expressed in mm, with larger values indicating better softness of the material.

1.2.2 annular flexibility: all samples are tested according to the standard of 'measuring softness of QB/T5155 artificial leather synthetic leather test method', the size of the sample is 270mm multiplied by 100mm, the arch-shaped length-height ratio of the sample is recorded, the result is a dimensionless number, and the larger the value is, the better the softness is.

1.2.345 ° ramp: all samples are tested by referring to the standard of 'measurement of softness of QB/T5155 artificial leather synthetic leather test method', the size of the sample is 200mm multiplied by 25mm, the push-out speed of the sample piece is 10mm/s, the push-out length in the transverse direction and the longitudinal direction is recorded, and the result is expressed by mm, and the smaller the value is, the better the softness of the material is.

1.3 test results:

as shown in table 1, which is the experimental results for the samples of example 1, comparative examples 1-4:

TABLE 1 results of the softness test influenced by the type of structure of the base cloth

Sample (I)	Indentation stiffness/mm	Circular softness	45 degree slope/mm
				Example 1	4.9	3.12	43.5
Comparative example 1	3.6	1.80	71.2
				Comparative example 2	3.5	1.97	77.3
Comparative example 3	4.2	2.12	57.4
				Comparative example 4	4.3	2.20	56.9

As can be seen from the data in table 1, different base fabric structures affect the softness of the PVC artificial leather on the premise that the raw materials and the preparation process of the top layer and the foaming layer of the PVC artificial leather are completely the same. The softness of the base fabric material is better because the base fabrics of the examples 1, 3 and 4 are all fluffy fabric structures, and the softness of the base fabric material is better because the softness of the base fabric material is better and the softness of the base fabric material is better because the softness of the base fabric of the comparative examples 3 and 4 is better and the softness of the base fabric material is more effective in the comparative examples 1 and 2; in contrast, the bulk of the base fabric of the present invention is much higher than comparative example 3, comparative example 4, resulting in better softness.

(II) flexibility performance test:

the samples of example 1, comparative examples 5-6 were tested:

2.1 test methods: the tensile testing machine meets the requirements of JB/T7797

2.2 test methods: the test is carried out by referring to GB/T38612-2020 measurement of tensile load and elongation at break of artificial leather synthetic leather test method, the sample size is 200mm multiplied by 30mm, and the constant elongation rate is 200 mm/min. And starting a tensile testing machine, stretching the sample to break, and recording the maximum force value (unit: N) to be accurate to 0.1N.

TABLE 2 maximum force to break for sample tensile specimens

Sample (I)	Example 1	Comparative example 5	Comparative example 6
				Maximum force value N	223.4	186.5	193.3

As shown in Table 2, the nano silica filler used in the invention can enhance the tensile strength of the PVC artificial leather, indicating that the PVC artificial leather prepared by the invention has excellent tensile resistance.

Example two

In a preferred practice of the invention, the outer surface of the facing layer is further coated with a silicone-modified polyurethane resin coating.

The polyurethane resin is graft-modified by using the organic silicon, and the effect of being soft and smooth on artificial leather is obtained. Because the main body of the polyurethane is also polyester ether, the polyurethane can be modified by using organic silicon containing polyether, and has the advantage of good compatibility. The organosilicon modification has the advantages that the modulus of 100 percent and the sliding friction coefficient are simultaneously reduced, but the artificial leather can be endowed with softness and smoothness or needs to be soft and non-sticky.

In one embodiment, the silicone modifier may be SF-8427 (DOW CORNING), which is a polyether modified silicone with two hydroxyl groups and a relative molecular mass of 2000.

Other structures of the leather and leather fabric and the preparation process thereof are disclosed in the present embodiment.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. The leather fabric is characterized by comprising a surface layer, a foaming layer and a base cloth which are sequentially compounded from top to bottom;

2. The leather lining of claim 1, wherein:

the fabric reverse side of the base fabric is a small coil structure consisting of 1 cotton yarn and 1 metaplexis japonica fiber, and the fabric reverse side is provided with a plurality of rows of compact small coil longitudinal rows arranged at intervals;

3. The leather lining of claim 1, wherein:

the loose big coil wale and the tight small coil wale are periodically distributed at intervals in a row, a tight small coil wale is clamped between the loose big coil wale of any two adjacent rows, and a loose big coil wale is clamped between the tight small coil wale of any two adjacent rows.

4. The leather lining of claim 1, wherein:

the surface layer is made of PVC resin powder, a plasticizer, a stabilizer, color paste and a nano silica filler, and the polymerization degree of the PVC resin powder is 1600.

5. The leather lining of claim 4, wherein:

and treating the nano silicon dioxide by using a silane coupling agent.

6. The leather lining of claim 4, wherein:

the plasticizer is acetyl epoxidized vegetable oil acid glyceride.

7. The leather lining of claim 1, wherein:

the foaming layer is made of PVC resin powder, an AC foaming agent, a plasticizer, a calcium-zinc stabilizer and calcium carbonate, and the polymerization degree of the PVC resin powder is 1600;

wherein the plasticizer is acetyl epoxidized vegetable oil acid glyceride.

8. The leather lining of claim 1, wherein:

the outer surface of the surface layer is also coated with an organic silicon modified polyurethane resin coating.

9. The process for preparing a leather fabric for leathers according to any of claims 1 to 8, comprising the steps of:

(4) surface treatment and graining.