阅读说明：本技术 一种汽车内饰用真皮热收缩结构及其制备方法 (Real leather heat-shrinkable structure for automotive interior and preparation method thereof ) 是由 肖焰 郎博 马少华 李博 于 2021-04-27 设计创作，主要内容包括：本发明公开了一种汽车内饰用真皮热收缩结构,包括真皮复合层和热收缩层,所述热收缩层贴覆在真皮复合层的底面,所述热收缩层的面积与真皮复合层相同或热收缩层的面积小于真皮复合层的面积。本发明中,LDPE热收缩膜层、PVC热收缩膜层和POF热收缩膜层复合后形成热收缩层,该三层膜层具有不同的横向和纵向的收缩率,在受热后能够弯曲变形,由于三层膜层的收缩率不同,使整体复合材料弯曲的更匀润,与汽车扶手的贴合性更好,涂上少量的胶既可以实现较好的粘接效果,而且无需较大的压力既能实现压紧。(The invention discloses a genuine leather heat-shrinkable structure for automotive interior, which comprises a genuine leather composite layer and a heat-shrinkable layer, wherein the heat-shrinkable layer is attached to the bottom surface of the genuine leather composite layer, and the area of the heat-shrinkable layer is the same as that of the genuine leather composite layer or smaller than that of the genuine leather composite layer. According to the invention, the LDPE heat shrinkable film layer, the PVC heat shrinkable film layer and the POF heat shrinkable film layer are compounded to form the heat shrinkable layer, the three film layers have different transverse and longitudinal shrinkage rates and can be bent and deformed after being heated, the bending of the whole composite material is more uniform due to the different shrinkage rates of the three film layers, the adhesion with an automobile handrail is better, a good bonding effect can be realized by coating a small amount of glue, and the compression can be realized without large pressure.)

1. The utility model provides a genuine leather heat-shrinkable structure for automotive interior which characterized in that: the leather composite layer is attached to the bottom surface of the leather composite layer, and the area of the thermal shrinkage layer is the same as that of the leather composite layer or smaller than that of the leather composite layer.

2. The dermal heat shrinkage structure for automotive interiors according to claim 1, wherein: the area of the heat shrinkage layer is smaller than that of the dermis composite layer, and the heat shrinkage layer is in a shape of a plurality of strips which are arranged transversely or vertically at intervals.

3. The dermal heat shrinkage structure for automotive interiors according to claim 1, wherein: the area of the heat shrinkage layer is smaller than that of the dermis composite layer, and the heat shrinkage layer is a plurality of circles or a plurality of ellipses which are arranged at intervals.

4. The dermal heat shrinkage structure for automotive interiors according to claim 1, wherein: the area of the heat-shrinkable layer is smaller than that of the dermis composite layer, the heat-shrinkable layer comprises a plurality of transverse strip shapes and a plurality of vertical strip shapes, the transverse strip shapes are arranged at intervals, the plurality of transverse strip shapes are positioned on the bottom layer, and the plurality of vertical strip shapes are positioned on the bottom layer.

5. A dermal heat-shrinkable structure for automotive interiors according to claim 1, 2, 3 or 4, characterized in that: the heat shrinkable layer comprises an LDPE heat shrinkable film layer, a PVC heat shrinkable film layer and a POF heat shrinkable film layer, wherein two adjacent heat shrinkable film layers of the three heat shrinkable film layers are mutually compounded through an adhesive layer.

6. The dermal heat-shrinkable structure for automotive interiors according to claim 5, wherein: the leather composite layer comprises a surface coating, a leather layer, a basalt fiber layer and a cloth layer, the surface coating is arranged on the upper surface of the leather layer, the basalt fiber layer and the cloth layer are sequentially arranged below the leather layer, and glue layers are respectively arranged between the upper surface of the basalt fiber layer and the leather layer and between the bottom surface of the basalt fiber layer and the cloth layer.

7. The dermal heat shrinkage structure for automotive interiors according to claim 6, wherein: the surface coating comprises the following mixed components in parts by weight:

8. the dermal heat shrinkage structure for automotive interiors according to claim 7, wherein: the curable resin monomer is polyether polyurethane; the cross-linking agent is diphenylmethane diisocyanate; the photoinitiator is a mixture of alpha, alpha-diethoxyacetophenone and 2, 4-dihydroxy benzophenone.

9. The dermal heat shrinkage structure for automotive interiors according to claim 8, wherein: the glue layer is neoprene latex.

10. The method for manufacturing a dermal heat-shrinkable structure for automotive interiors according to claim 9, wherein: the method comprises the following steps:

preparing a surface coating;

coating the prepared surface coating on the surface of a corium layer by using a coating machine, and then curing the gloss oil on the surface of the natural leather by using a UV curing machine to form a protective layer;

preparing a glue layer raw material; preparing a basalt fiber layer;

a double-roller laminating machine is used for laminating the leather layer, the adhesive layer and the basalt fiber layer;

gluing the bottom surface of the basalt fiber layer, and gluing the cloth layer by using a double-roller gluing machine;

and gluing the surface of the thermal contraction layer and bonding the thermal contraction layer to the bottom surface of the cloth layer, and compounding the thermal contraction layer on the cloth layer by utilizing the extrusion of a hot-pressing roller to obtain a finished product.

Technical Field

The invention belongs to the technical field of automobile interior materials, and relates to improvement of a genuine leather layered structure, in particular to a genuine leather heat-shrinkable structure for automobile interior.

Background

Among automotive interior parts, leather interior is a very popular item, in which a leather layer is coated on the outer surface of a cab structure, thereby improving the appearance of the cab and reducing the wear of the more frequent contact parts of people, such as: the handrail of door upper end and the door plant handrail of door, these handrails are the position that people can contact frequently, and the process when its whole outside cladding genuine leather includes rubber coating, parcel and compresses tightly, because the genuine leather has certain elasticity, in order to make the inseparable cladding of genuine leather on the handrail, need coat more glue between handrail and genuine leather, and the later stage compresses tightly also to need give great dynamics moreover, leads to the complexity of operation.

Application number CN202010447096.1 discloses a solvent-free leather high-brightness UV gloss oil preparation process, which comprises the following steps: s1, stirring and uniformly mixing the modified hyperbranched polyurethane acrylate, the epoxy acrylate, the active monomer and the photoinitiator at normal temperature to obtain a mixed solution; s2, stirring until the mixed solution is clear and transparent and has no solid suspended matter, and preparing the solvent-free leather high-brightness UV gloss oil; the weight ratio of the modified hyperbranched polyurethane acrylate to the epoxy acrylate to the active monomer to the photoinitiator is 60-75: 10-25: 6-12: 1 to 3. The solvent-free leather high-brightness UV gloss oil prepared by the preparation process has the characteristics of low curing temperature, high curing speed, excellent coating film gloss and attractive appearance, avoids the use of cross-linking agents such as formaldehyde in a leather finishing agent, plays an environmental protection role, accords with the development direction of ecological leather, and is suitable for large-scale popularization and application.

The following publications were searched for the above technical problems:

application number CN201910630638.6 provides a flexible wear-resistant leather coating and a preparation method thereof, comprising: (1) dissolving polyvinyl alcohol in water to obtain a polyvinyl alcohol aqueous solution, adding the polyvinyl alcohol aqueous solution into the coating agent matrix emulsion under the condition of stirring, and stirring to obtain the polyvinyl alcohol/coating agent matrix composite emulsion. (2) Firstly, wetting the surface of leather to be treated; secondly, spraying the polyvinyl alcohol/finishing agent matrix composite emulsion on the surface of the wetted leather by a spraying method; finally, the leather sample after being coated is immediately subjected to freezing-unfreezing cycle treatment for a plurality of times, and then is dried at room temperature to form a film. The leather coating prepared by the method has a three-dimensional porous network structure, so that the flexibility and the air permeability of the leather can be effectively guaranteed, and the wear resistance of the leather can be obviously improved.

Application number CN 201810986479.9A polyacrylate super-hydrophobic leather brightener containing organosilicon long side chains and a preparation method of a coating thereof comprise the following process steps: 1. carrying out condensation reaction on equal molar methyl methacrylate and hydroxyl silicone oil under the action of a catalyst to prepare methacrylic siloxane; 2. carrying out dehydrogenation reaction on hydroxyethyl acrylate and methyl hydrogen-containing silicone oil with equal mole under the action of a catalyst to prepare siloxane ethyl acrylate; 3. using the prepared methyl acrylic siloxane and acrylic siloxane ethyl ester as monomers, and preparing polyacrylate containing organosilicon long side chains through copolymerization reaction under the action of an initiator; 4. adding hydrophobic nano silicon dioxide, and physically and uniformly mixing to obtain the super-hydrophobic leather brightener; 5. adding a catalyst into the super-hydrophobic leather brightener, directly spraying or brushing the catalyst on the surface of the leather, and carrying out a curing reaction to prepare the super-hydrophobic leather coating with the lotus leaf effect. The invention is widely applied to the technical field of surface treatment and modification of fibers such as leather, fabrics, paper and the like.

The invention of application No. CN201580046489.9 relates to a method for coating textiles and/or leather, characterized in that at least one polyurethaneurea dissolved in a solvent or solvent mixture is used, wherein the solvent consists solely of one or more monohydroxy-functional alcohols or a solvent mixture consisting solely of organic solvents is used, which solvent mixture contains > 80% by weight of at least one monohydroxy-functional alcohol, relative to the total mass of the solvent mixture, and wherein the polyurethaneurea is formed from the following components: a) at least one araliphatic, aliphatic and/or cycloaliphatic diisocyanate, b) at least one polyether polyol having a number average molecular weight Mn of 400 or more and 6000g/mol or less and an average hydroxyl functionality of 1.5 or more and 4 or less, c) at least one amino-functional compound having at least two isocyanate-reactive amino groups, and optionally further components. The invention also relates to textile or leather coatings obtainable according to this method and to dissolved polyurethaneureas and to the use of the polyurethaneureas for coating substrates and for producing free films.

Application number CN201310229116.8 an imitation leather jean fabric, including basic unit and top layer, the basic unit is interweaved by warp and weft and forms, warp is formed by cotton yarn and bunchy yarn mixture, weft divide into the three-layer, and the first layer is cotton yarn, and the second floor is diamond silk, and the third layer is the T400 fibre, warp with weft adopts twill circulation to interweave on two. The ready-made clothes washing style of the leather coating fabric is a simple, random and exaggerated fashion style, the stability of the fabric is high, and the leather effect is achieved. Importantly, the manufacturing cost is greatly reduced, and the method is better popularized and applied in the market.

Application number CN201220187914.X relates to a leather, especially a wear-resisting car steering wheel leather, including the leather germ layer, leather germ layer upside covers the back cover, the coating has the primer layer on the back cover, be equipped with the brush thick liquid layer between back cover and the primer layer, be equipped with the dyed layer on the primer layer, be equipped with the adhesion layer between dyed layer and the primer layer, leather germ layer downside covers the inside layer, spout the top thick liquid layer on the dyed layer. The leather blank layer is covered with the inner sealing layer and the bottom sealing layer up and down to be used as a supporting base material, so that the flatness of the leather is increased, the leather body is full, soft and elastic, and the leather surface is smooth and bright; meanwhile, an adhesion layer is added between the leather coatings, so that the leather coatings can be well penetrated to prevent delamination, and an elastic coating film with excellent support flexibility is formed by curing at a certain temperature, so that the texture of the leather is improved, the interlayer combination is promoted, and the steering wheel leather is endowed with wear resistance and abrasion resistance.

As can be seen from the above, there are various multilayer structures in the prior art, but there is no mention of how to solve the problems of the prior art, and these structures still need to be further optimized from the raw material and manufacturing process aspects.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the environment-friendly, high-performance and high-wear-resistance automobile interior leather composite material, the composite material has stronger thermal shrinkage performance, and less glue is used and less pressing force is applied during coating; moreover, the basalt fiber is added into the material, so that the performances of high temperature resistance, radiation resistance and the like of the material can be greatly improved, and the strength of the material is increased; the adhesive used in the material is chloroprene rubber latex, and the latex is water-soluble and environment-friendly.

The utility model provides a genuine leather heat-shrinkable structure for automotive interior which characterized in that: the leather composite layer is attached to the bottom surface of the leather composite layer, and the area of the thermal shrinkage layer is the same as that of the leather composite layer or smaller than that of the leather composite layer.

The heat-shrinkable layer has an area smaller than that of the dermal composite layer, and is formed in a plurality of strips arranged horizontally or vertically at intervals.

The heat-shrinkable layer has an area smaller than that of the dermal composite layer, and has a plurality of circular or elliptical shapes arranged at intervals.

Furthermore, the area of the heat-shrinkable layer is smaller than that of the dermal composite layer, and the heat-shrinkable layer includes a plurality of transverse stripe shapes and a plurality of vertical stripe shapes, wherein the transverse stripe shapes are arranged at intervals, the plurality of transverse stripe shapes are positioned on the bottom layer, and the plurality of vertical stripe shapes are positioned on the bottom layer.

And the heat shrinkage layers comprise an LDPE heat shrinkage film layer, a PVC heat shrinkage film layer and a POF heat shrinkage film layer, and two adjacent heat shrinkage film layers of the three heat shrinkage film layers are mutually compounded through an adhesive layer.

And the leather composite layer comprises a surface coating, a leather layer, a basalt fiber layer and a cloth layer, the surface coating is arranged on the upper surface of the leather layer, the basalt fiber layer and the cloth layer are sequentially arranged below the leather layer, and glue layers are respectively arranged between the upper surface of the basalt fiber layer and the leather layer and between the bottom surface of the basalt fiber layer and the cloth layer.

Furthermore, the surface coating comprises the following components mixed according to the parts by weight:

furthermore, the curable resin monomer is polyether polyurethane; the cross-linking agent is diphenylmethane diisocyanate; the photoinitiator is a mixture of alpha, alpha-diethoxyacetophenone and 2, 4-dihydroxy benzophenone.

Furthermore, the glue layer is neoprene latex.

Another object of the present invention is to provide a method for preparing a genuine leather heat-shrinkable structure for automotive interior, which is characterized in that: the method comprises the following steps:

preparing a surface coating;

coating the prepared surface coating on the surface of a corium layer by using a coating machine, and then curing the gloss oil on the surface of the natural leather by using a UV curing machine to form a protective layer;

preparing a glue layer raw material; preparing a basalt fiber layer;

a double-roller laminating machine is used for laminating the leather layer, the adhesive layer and the basalt fiber layer;

gluing the bottom surface of the basalt fiber layer, and gluing the cloth layer by using a double-roller gluing machine;

and gluing the surface of the thermal contraction layer and bonding the thermal contraction layer to the bottom surface of the cloth layer, and compounding the thermal contraction layer on the cloth layer by utilizing the extrusion of a hot-pressing roller to obtain a finished product.

The invention has the technical effects that:

according to the invention, the LDPE heat shrinkable film layer, the PVC heat shrinkable film layer and the POF heat shrinkable film layer are compounded to form the heat shrinkable layer, the three film layers have different transverse and longitudinal shrinkage rates and can be bent and deformed after being heated, the bending of the whole composite material is more uniform due to the different shrinkage rates of the three film layers, the adhesion with an automobile handrail is better, a good bonding effect can be realized by coating a small amount of glue, and the compression can be realized without large pressure. In addition, the surface coating is coated on the surface of the real leather layer, the brightness of the surface of the real leather layer can be improved, the appearance is improved, and the abrasion-resistant effect is achieved.

Drawings

FIG. 1 is a schematic view of the present invention in layer form.

Fig. 2 is a schematic layer diagram of a heat shrinkable layer.

Fig. 3 is a schematic view of a heat shrinkable layer in the shape of a tape.

Fig. 4 is a schematic view of a heat shrinkable layer having a circular or elliptical shape.

FIG. 5 is a schematic view of a plurality of transverse stripe shapes and a plurality of vertical stripe shapes.

Detailed Description

The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.

The invention relates to a genuine leather heat-shrinkable structure for automobile interior decoration, as shown in figure 1, the innovation of the invention lies in that: the leather-leather composite layer thermal contraction device comprises a leather composite layer and a thermal contraction layer 7, wherein the thermal contraction layer is attached to the bottom surface of the leather composite layer through an adhesive layer 6, and the area of the thermal contraction layer is the same as that of the leather composite layer or smaller than that of the leather composite layer.

The heat-shrinkable layer having the same area as the dermal composite layer means that the dermal composite layer and the heat-shrinkable layer having the same transverse and longitudinal dimensions are bonded together as shown in fig. 1 and 2.

Alternatively, the heat-shrinkable layer may have an area smaller than that of the dermal composite layer, and may have a shape as shown in fig. 3 to 5. The method comprises the following steps: as shown in fig. 3, the heat-shrinkable layer is in the shape of a plurality of strips arranged transversely or vertically at intervals; as shown in fig. 4, the heat-shrinkable layer has a plurality of circles or a plurality of ellipses arranged at intervals; as shown in fig. 5, the heat-shrinkable layer includes a plurality of transverse stripe shapes disposed at intervals and a plurality of vertical stripe shapes disposed at intervals, the plurality of transverse stripe shapes being located at the bottom layer or the plurality of vertical stripe shapes being located at the bottom layer.

The heat-shrinkable layers comprise an LDPE heat-shrinkable film layer 8, a PVC heat-shrinkable film layer 10 and a POF heat-shrinkable film layer 12, and the thicknesses of the three film layers are respectively 0.1 mm, 0.05 mm and 0.1 mm. Two adjacent film layers of the three film layers are mutually compounded through glue layers 9 and 11. When the three layers of film layers are compounded, the three layers of film layers are arranged according to a certain direction according to the requirements of transverse shrinkage rate and longitudinal shrinkage rate, then the upper surface and the lower surface of the PVC heat shrinkage film layer are respectively coated with glue, then the PVC heat shrinkage film layer is extruded and compounded by a hot-pressing roller at 40-50 ℃, and the PVC heat shrinkage film layer is naturally cooled and solidified under the state of maintaining a certain pressure.

The transverse shrinkage rate of the LDPE heat shrinkable film layer is 10-20%, and the longitudinal shrinkage rate is 30-40%. The transverse shrinkage rate of the PVC heat shrinkable film layer is 30-40%, and the longitudinal shrinkage rate is 15-20%. The transverse shrinkage rate of the POF heat shrinkable film layer is 50-55%, and the longitudinal shrinkage rate is 50-55%.

The structure of the leather composite layer is shown in figure 1, and comprises a surface coating, a leather layer 1, a basalt fiber layer 3 and a cloth layer 5, wherein the surface coating is arranged on the upper surface of the leather layer, the basalt fiber layer and the cloth layer are sequentially arranged below the leather layer, and glue layers 2 and 4 are respectively arranged between the upper surface of the basalt fiber layer and the leather layer and between the bottom surface of the basalt fiber layer and the cloth layer.

The thickness of the surface coating is 0.1-0.3 mm. The thickness of the glue layer is 0.1-0.3 mm. The thickness of the cloth layer is 0.1-0.5 mm.

The surface coating comprises the following mixed components in parts by weight:

curable resin monomer	30-35	Portions are
			Antistatic agent	0.1-1	Portions are
Crosslinking agent	0.5-1	Portions are
			Photoinitiating agents	1-2	Portions are
Leveling agent	1-1.5	Portions are
			Solvent(s)	50-60	And (4) portions are obtained.

The curable resin monomer is a polyether urethane. The antistatic agent is a quaternary ammonium compound, a tetraorganoboron metal salt or other antistatic agent for leather. The cross-linking agent is diphenylmethane diisocyanate. The photoinitiator is a mixture of alpha, alpha-diethoxyacetophenone and 2, 4-dihydroxybenzophenone. The leveling agent is organic modified polydimethylsiloxane, polyether polyester modified organosiloxane or other leveling agents used for coatings. The glue layer is neoprene latex.

The preparation method of the environment-friendly genuine leather composite interior material comprises the following steps:

preparing a surface coating;

coating the prepared surface coating on the surface of a corium layer by using a coating machine, and then curing the gloss oil on the surface of the natural leather by using a UV curing machine to form a protective layer;

preparing a glue layer raw material; preparing a basalt fiber layer;

a double-roller laminating machine is used for laminating the leather layer, the adhesive layer and the basalt fiber layer;

gluing the bottom surface of the basalt fiber layer, and gluing the cloth layer by using a double-roller gluing machine;

and gluing the surface of the thermal contraction layer and bonding the thermal contraction layer to the bottom surface of the cloth layer, and compounding the thermal contraction layer on the cloth layer by utilizing the extrusion of a hot-pressing roller to obtain a finished product.

Example 1

(1) Preparation of surface coatings

Adding the raw materials into a high-speed stirring dispersion machine, stirring at a high speed of 1500 rpm for 2 hours, grinding the stirred polyurethane coating for 3 times by a three-roll grinding machine, adding 0.5 kg of cross-linking agent MDI, and grinding for 3 times by the three-roll grinding machine for standby application, wherein the standing time cannot exceed 8 hours.

(2) Uniformly coating the prepared polyurethane coating on the surface of 1 mm of natural leather by using a coating machine, wherein the coating temperature is 80 ℃; the coating thickness is 0.1+0.05 mm; then curing the leather by a UV curing machine for 4 minutes by using an ultraviolet high-pressure mercury lamp of 100w to form a protective layer on the surface of the natural leather;

(3) preparing adhesive, namely stirring 20 kg of neoprene latex and 0.5 kg of phenolic resin in a 150L mucilage stirrer for 6 hours at the temperature of 20-30 ℃ and at the stirring speed of 30 r/min to prepare the neoprene latex material.

(4) Preparing 0.2 mm basalt fiber cloth, and coating a neoprene latex material on the surface of the basalt fiber cloth on one surface by using a coating machine; the coater temperature was 90 deg.C, the line speed was 12 m/min coating thickness 0.2 mm, and then the other side was coated with the same process for use.

(5) The temperature was 95 ℃ using a double roller laminator. The pressure was 0.05 MPa/tl. And (4) bonding the prepared (2), (3) and (4) for later use.

(6) A nylon mesh cloth with a thickness of 0.2 mm was prepared.

(7) Coating a glue layer on the upper surface of the nylon mesh cloth, then using a double-roller laminating machine to laminate the nylon mesh cloth on the basalt fiber cloth, wherein the double-roller laminating machine is used for laminating the nylon mesh cloth at the temperature of 80 ℃ and under the pressure of 0.1MPA and the linear speed of 8 m/min.

(8) And (3) using a four-roll calender to press and cure the material (7), wherein the temperature of 1 roll of the four-roll calender is 30 ℃, the gap is 1.8 mm, the temperature of 2 rolls is 30 ℃, the gap is 2.0 mm, the temperature of 3 rolls is 35 ℃, the gap is 2.0 mm, and the temperature of 4 rolls is 40 ℃, and the gap is 2.0 mm.

(9) Preparation of Heat shrinkable film

According to the requirements of transverse shrinkage and longitudinal shrinkage, three film layers are arranged in a certain direction, and the method specifically comprises the following steps: the LDPE heat shrinkable film layer is transversely arranged, the PVC heat shrinkable film layer is longitudinally arranged, and the POF heat shrinkable film layer is transversely arranged. Respectively coating glue on the upper and lower surfaces of the PVC heat shrinkable film layer, extruding and compounding by using a hot-pressing roller at 40-50 ℃, and naturally cooling and solidifying under the state of maintaining a certain pressure

(10) Completing the lamination of the heat shrinkable film

And (3) compounding the three layers of films, cutting according to a certain size, gluing, attaching to the bottom surface of the nylon mesh fabric, extruding by using a hot-pressing roller at the temperature of 30-40 ℃, and naturally cooling and solidifying under the state of keeping pressure.

The resulting structure is shown in fig. 3, with each strip shape having a transverse width of 5-6 cm and a spacing of 0.5-1 cm between each strip shape.

The shrinkage rate of the LDPE heat shrinkable film layer in the transverse direction of the graph 3 is 10-20%, and the shrinkage rate in the vertical direction is 30-40%; the shrinkage rate of the PVC heat shrinkable film layer in the transverse direction of the graph 3 is 15-20%, and the shrinkage rate in the vertical direction is 30-40%; the shrinkage rate of the POF heat shrinkable film layer in the transverse direction of the graph 3 is 50-55%, and the shrinkage rate in the vertical direction is 50-55%.

Example 2

(1) Preparation of surface coatings

Adding the raw materials into a high-speed stirring dispersion machine, stirring at a high speed of 1500 rpm for 2 hours, grinding the stirred polyurethane coating for 3 times by a three-roll grinding machine, adding 0.6 kg of cross-linking agent MDI, and grinding for 4 times by the three-roll grinding machine for standby application, wherein the standing time cannot exceed 8 hours.

(2) Uniformly coating the prepared polyurethane coating on the surface of 1.4 mm natural leather by using a coating machine, wherein the coating temperature is 80 ℃; the coating thickness is 0.1+0.05 mm; then curing the leather by a UV curing machine for 3 minutes by using an ultraviolet high-pressure mercury lamp of 100w to form a protective layer on the surface of the natural leather;

(3) preparing adhesive, namely stirring 20 kg of neoprene latex and 0.5 kg of phenolic resin in a 150L mucilage stirrer for 6 hours at the temperature of 20-30 ℃ and at the stirring speed of 30 r/min to prepare the neoprene latex material.

(4) Preparing 0.3 mm basalt fiber cloth, and coating a neoprene latex material on the surface of the basalt fiber cloth on one surface by using a coating machine; the coater temperature was 90 deg.C, the line speed was 12 m/min coating thickness 0.2 mm, and then the other side was coated with the same process for use.

(5) The temperature was 95 ℃ using a double roller laminator. The pressure was 0.05 MPa/tl. And (4) bonding the prepared (2), (3) and (4) for later use.

(6) - (10) same as in example 1, but using a heat shrinkable film structure as shown in FIG. 4.

Example 3

(1) Preparation of surface coatings

Adding the raw materials into a high-speed stirring dispersion machine, stirring at a high speed of 1500 rpm for 2 hours, grinding the stirred polyurethane coating for 3 times by a three-roll grinding machine, adding 0.7 kg of cross-linking agent MDI, and grinding for 4 times by the three-roll grinding machine for standby application, wherein the standing time cannot exceed 8 hours.

(2) Uniformly coating the prepared polyurethane coating on the surface of 1.4 mm natural leather by using a coating machine, wherein the coating temperature is 80 ℃; the coating thickness is 0.1+0.05 mm; then curing the leather by a UV curing machine for 3 minutes by using an ultraviolet high-pressure mercury lamp of 100w to form a protective layer on the surface of the natural leather;

(3) preparing adhesive, namely stirring 20 kg of neoprene latex and 0.7 kg of phenolic resin in a 150L mucilage stirrer for 6 hours at the temperature of 20-30 ℃ and at the stirring speed of 30 r/min to prepare the neoprene latex material.

(4) Preparing 0.3 mm basalt fiber cloth, and coating a neoprene latex material on the surface of the basalt fiber cloth on one surface by using a coating machine; the coater temperature was 90 deg.C, the line speed was 12 m/min coating thickness 0.2 mm, and then the other side was coated with the same process for use.

(5) The temperature was 95 ℃ using a double roller laminator. The pressure was 0.05 MPa/tl. And (4) bonding the prepared (2), (3) and (4) for later use.

(6) - (10) same as in example 1, but using a heat shrinkable film structure as shown in FIG. 4.

Application examples

Cutting according to the size of the automobile door plate handrail, placing the composite material at the handrail, uniformly blowing the composite material by using a hot air gun, controlling the temperature to be 80-100 ℃, naturally bending and deforming the composite material and coating the composite material on the handrail, coating the adhesive on the material surfaces of the inner sides of two edges of the composite material, drawing and pressing the two end edges of the composite material in a clamping or bundling mode, uniformly blowing the coated part by using the hot air gun after the composite material is fixed, and naturally placing for 10 hours to finish the coating of the composite material.