Composite mechanism for gluing silica gel leather and polyurethane sponge

Abstract

The invention provides a compounding mechanism for gluing silica gel leather and polyurethane sponge, and belongs to the technical field of sponge product processing. Comprising a sponge layer feeding roller, a silica gel layer feeding roller, a gluing structure, a gum dipping structure, a rolling structure and a winding structure, the gum dipping structure comprises a plurality of gum dipping units, and each gum dipping unit comprises a vibration groove with an upward opening, a plurality of steel balls located in the vibration groove and a magnetic roller rotationally connected to the opening of the vibration groove; a plurality of magnetic attraction pieces are evenly arranged on the circumferential face of the magnetic roller in the circumferential direction, the gluing structure glues the composite face of the silica gel layer and then passes through the magnetic roller of the first impregnation unit, the rolling structure rolls the composite layer pulled out of the last impregnation unit, and the rolling structure rolls the rolled composite layer. The magnetic roller rotates so that the steel balls in the vibration groove can be attracted to the outer side face of the silica gel layer at the magnetic roller, and the steel balls attracted by the magnetic force of the magnetic roller can break away from the magnetic roller and fall into the vibration groove in the gradual separation process of the silica gel layer and the magnetic roller. The adhesive has the advantages of high peel strength and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of sponge product processing and relates to a composite structure of silicone leather and polyurethane sponge. Background Art

[0002] With the increase in the number of cars and the increasing demand for car riding comfort among car consumers, the automotive industry chain has put forward higher and higher requirements for automotive interior materials. Among them, odor / VOC, aging, yellowing / falling, cleaning and maintenance and other issues have become the focus of attention of automobile manufacturers and the automotive industry chain. The mainstream PVC leather laminated polyurethane sponge products and PU leather laminated polyurethane sponge products for automotive interiors have been criticized by more and more consumers due to their excessive odor / VOC, easy aging, yellowing and falling, and difficult cleaning and maintenance. The development of leather laminated sponge products with low odor and low VOC, not easy to age, yellow and fall, easy to clean and maintain, and cheaper than genuine leather (cowhide, sheepskin, pigskin) laminated polyurethane sponge products has become an urgent need for consumers and industry enterprises.

[0003] The applicant's prior application for a sponge product of silicone bonded to polyurethane sponge (application number: 202411339853.8) involves the compounding of silicone and sponge. In the prior art, the compounding of the two sheets is generally achieved by rolling the composite surfaces with glue. However, in the process of compounding the polyurethane sponge and silicone, due to the special pore structure of the sponge, its bonding surface is different from other flat bonding surfaces. It is difficult to achieve a uniform glue layer after one coating, and it is also impossible to fully utilize the pore structure to achieve strong bonding. Therefore, in the sponge product formed by the bonding of the sponge and silicone, it is difficult to achieve the ideal effect by using traditional methods to compound the two structures. Summary of the invention

[0004] The purpose of the present invention is to provide a composite structure of silicone leather and polyurethane sponge in view of the above-mentioned problems existing in the prior art. The technical problem to be solved by the present invention is how to improve the peeling strength between the silicone layer and the sponge layer.

[0005] The object of the present invention can be achieved through the following technical scheme: a composite structure of silicone leather and polyurethane sponge, characterized in that it includes a sponge layer feeding roller, a silicone layer feeding roller, a glue coating structure, a dipping structure, a rolling structure and a winding structure, the dipping structure includes a plurality of dipping units, the dipping unit includes a vibration groove with an upward opening, a plurality of steel balls located in the vibration groove and a magnetic roller rotatably connected to the opening of the vibration groove, a plurality of magnetic suction parts are evenly arranged on the circumferential surface of the magnetic roller, the glue coating structure coats the composite surface of the silicone layer with glue and then passes it through the magnetic roller of the first dipping unit, the rolling structure rolls the composite layer pulled out from the last dipping unit, and the winding structure winds up the rolled composite layer, the rotation of the magnetic roller can make the steel balls in the vibration groove adsorbed on the outer side of the silicone layer at the magnetic roller, and the steel balls adsorbed by the magnetic force of the magnetic roller can break away from the adsorption of the magnetic roller and fall into the vibration groove during the gradual separation of the silicone layer and the magnetic roller.

[0006] Furthermore, a sponge traction roller for traction of the sponge layer and a silicone traction roller for traction of the silicone layer are arranged between adjacent dipping units, the sponge traction roller is located above the silicone traction roller, and the composite structure also includes a scraper roller corresponding to the silicone traction roller one by one and cooperating with the silicone traction roller to clamp the silicone layer.

[0007] Furthermore, the magnetic attraction member is a permanent magnetic strip parallel to the axis of the magnetic roller.

[0008] As another option, the magnetic member is an electromagnetic strip in the shape of a strip parallel to the axis of the magnetic roller.

[0009] Furthermore, the outer wall of the magnetic roller is coated with a buffer layer.

[0010] The silicone sponge composite product is an artificial leather formed by applying glue to the composite surface of the silicone layer and then compounding it with the sponge. It has the characteristics of low VOC content, high peel strength, good comfort, etc. The sponge used is a sheet formed by cutting a thick sponge blank, so that the foam distribution on the composite surface of the sponge is irregular. The traditional gluing method is suitable for sheets with smooth composite surfaces. In this scheme, in order to further highlight the greater peel strength after the sponge and silicone leather material are compounded, and to better transition between the two materials of sponge and silicone leather, multiple dipping methods are used for bonding. Specifically, the liquid glue is coated on the silicone. The composite surface of the sponge layer is formed, and then the sponge layer enters the position of the first magnetic roller. The rotation of the magnetic roller drives the steel balls in the vibration groove to frequently adsorb and collide with the outer side of the silicone layer and break away from the adsorption of the magnetic roller. The steel balls frequently hit and squeeze the outer side of the silicone layer, so that the glue on the silicone layer can better penetrate into the broken wall pores on the composite surface of the sponge. Since the glue application on the silicone layer is relatively uniform, the distribution of the broken wall pores on the composite surface of the sponge, the size of the pore rupture, and the distribution position of the pores are all random. Therefore, it is difficult to make the glue on the composite surface of the sponge by directly compounding the sponge and the silicone layer. Effective and uniform coating, in this scheme, Gujiao traction roller, sponge traction roller and scraper roller are arranged between adjacent dipping units, so that the sponge and silicone layer are separated after the dipping unit, and the glue remaining on the composite surface of the silicone layer is rolled and coated evenly for a second time by the scraper roller, and then the next dipping unit is used to perform sponge dipping again in the state where the two materials are bonded, and this process is repeated to form a sponge dipping layer with uniform glue distribution and uniform filling of broken wall pores with glue at the composite layer of the sponge. The sponge dipping layer is a transition layer combining the sponge material and the silicone cortical material. After the glue is cured, This transition layer can not only improve the peeling strength of the two materials separating from each other, but also form a transition between the two materials with different properties such as softness and elongation, so that the composite material can have better rebound and shape retention under external force interference such as rubbing, squeezing, and stretching, and the sponge layer is less likely to tear locally, and the overall mechanical strength of the composite material is higher; the silicone skin layer itself is formed by one-time curing of silicone, and the glue used in the composite process of the sponge and the silicone skin layer is also silicone glue. Therefore, the silicone glue penetrates outward to a certain thickness on the composite surface of the sponge, which can greatly improve the bonding strength of the two and the integrity after composite. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of this composite mechanism.

[0012] Figure 2 It is a cross-sectional view of the magnetic roller.

[0013] Figure 3 yes Figure 1 Enlarged view of part A in the figure.

[0014] In the figure, 1. sponge layer feeding roller; 2. silicone layer feeding roller; 3. glue coating structure; 4. rolling structure; 5. vibration groove; 6. steel ball; 7. magnetic roller; 8. magnetic suction part; 9. silicone traction roller; 10. scraper roller; 11. buffer layer; 12. sponge traction roller. DETAILED DESCRIPTION

[0015] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0016] Silicone leather laminated polyurethane sponge products are composed of release film layer, hand-feel layer, silicone skin layer and polyurethane sponge layer from top to bottom. Among them, the release film layer is a PET silicone release film with a thickness of 25-75um and a release force of 5-20gf / inch; the hand-feel layer includes three components: surface treatment agent, catalyst and diluent; the silicone skin layer is 0.1-0.3mm thick and includes two components A and B; the polyurethane sponge is a polyester sponge or a polyether sponge with a thickness of 2-10mm and an air permeability of 150L / m2 / s-1500L / m 2 / s. Silicone leather laminated polyurethane sponge products have the advantages of delicate and comfortable touch, scratch resistance, low odor, low VOC, no aging, yellowing or shedding after long-term use, easy maintenance and cleaning, etc., which can meet the performance requirements of consumers for leather laminated sponge products for automotive interiors.

[0017] The surface treatment agent, diluent and catalyst are weighed in proportion and stirred and dispersed at a speed of 1000RPM for 1 minute using a high-speed disperser to obtain a hand-feeling oil; subsequently, the hand-feeling oil is coated on the release film according to the designed thickness using an automatic coating machine or a manual coating machine, and is placed in a blast drying oven at 130°C to 150°C for heating and curing for 3 minutes to obtain a hand-feeling layer with a release film;

[0018] Mix them in proportion and use a high-speed mixer to stir and disperse them at a speed of 1000RPM for 3 minutes to obtain the A and B components of the silicone skin layer. Then weigh the A and B components in a 1:1 ratio and stir and disperse them at a speed of 500RPM for 2 minutes to obtain the liquid silicone for the silicone skin layer. Then use an automatic coating machine or a manual coating machine to coat the liquid silicone on the hand-feel layer with the release film according to the designed thickness. Finally, put it in a blast drying oven at 130℃~150℃ for heating and curing for 2 minutes to obtain the silicone skin layer with the release film and the hand-feel layer. From top to bottom, they are the silicone skin layer, the hand-feel layer, and the release film.

[0019] like Figure 1 As shown, the prepared mixed silicone skin layer is coated on the silicone skin layer with liquid silicone using the coating structure 3 according to the designed thickness, so that the silicone skin layer and the sponge layer are connected by the coating structure 3 as shown in FIG. Figure 1The composite structure shown in the figure is processed by multiple dipping units, on the one hand, the glue liquid in the sponge pores is more evenly distributed, and on the other hand, the glue liquid on the surface of the silicone skin layer is secondary distributed and rolled evenly by the scraping roller 10, so that the glue liquid on the sponge composite surface is evenly distributed, the pores are filled, and the dipping thickness is uniform. After rolling, drying and natural cooling and solidification, a composite product with a sponge layer, a silicone skin layer, a hand-feel layer, and a release film (protective film) layer from top to bottom is obtained. When using, the release film can be removed.

[0020] The release film of the prepared silicone leather laminated polyurethane sponge product with a release film is peeled off, and then the silicone leather laminated polyurethane sponge product is pressed by an embossing machine to produce the desired leather texture, so as to obtain the desired silicone leather laminated polyurethane sponge product.

[0021] For other parameters of the sponge product, reference may be made to the applicant's prior application with application number 202411339853.8.

[0022] like Figure 1 , Figure 2 and Figure 3 The composite mechanism shown includes a sponge layer feeding roller 1, a silicone layer feeding roller 2, a glue coating structure 3, a dipping structure, a rolling structure 4 and a winding structure. The dipping structure includes a plurality of dipping units, and the dipping unit includes a vibration groove 5 with an opening facing upward, a plurality of steel balls 6 located in the vibration groove 5 and a magnetic roller 7 rotatably connected to the opening of the vibration groove 5. A plurality of magnetic suction parts 8 are evenly arranged on the circumferential surface of the magnetic roller 7. The glue coating structure 3 coats the composite surface of the silicone layer with glue and passes it through the magnetic roller 7 of the first dipping unit. The rolling structure 4 rolls the composite layer pulled out from the last dipping unit. The winding structure winds up the rolled composite layer. The rotation of the magnetic roller 7 can make the steel balls 6 in the vibration groove 5 adsorbed on the outer surface of the silicone layer at the magnetic roller 7. The steel balls 6 magnetically adsorbed by the magnetic roller 7 can break away from the adsorption of the magnetic roller 7 and fall into the vibration groove 5 during the gradual separation of the silicone layer and the magnetic roller 7. A sponge traction roller 12 for traction of the sponge layer and a silicone traction roller 9 for traction of the silicone layer are arranged between adjacent dipping units. The sponge traction roller 12 is located above the silicone traction roller 9. The composite structure also includes a scraper roller 10 which corresponds to the silicone traction roller 9 one by one and cooperates with the silicone traction roller 9 to clamp the silicone layer.

[0023] The magnetic attraction member 8 is a permanent magnetic strip parallel to the axis of the magnetic roller 7, or a strip-shaped electromagnetic strip, and the magnetic force can be controlled to adjust the striking intensity. The outer wall of the magnetic roller 7 is covered with a buffer layer 11 for protecting the sponge layer and improving the synchronization between the magnetic roller 7 and the sponge.

[0024] It should be noted here that: in the prior art, rolling is generally used to bond composite materials. However, sponge materials have their own particularities. The sponge involved in this solution is a sponge with a certain air permeability. The air permeability of the sponge is inconsistent in different parts of the sponge. This is because the pore distribution of the sponge after foaming is regular, and the bubble breaking diameters and bubble breaking positions at different positions after slicing are not uniform. Therefore, if rolling is performed directly after gluing, the penetration thickness of the glue on the sponge at some positions will be greater, while some positions will have less glue penetration. In this solution, after the glue is applied once, it is dipped in glue for multiple times. The point-like beating method is different from the rolling method. The point-like beating method is different from the rolling method. The beating method and the multi-point extrusion method can prevent the glue in the position with strong permeability from penetrating to the outside of the sponge to a large extent. The extrusion posture is scattered, which is conducive to the diffusion and penetration of the glue in the surface area of ​​the sponge composite surface. The roller pressing method is essentially a plane compression sponge due to the compressibility of the sponge, not a linear compression sponge. The penetration direction of the glue tends to the outer side of the sponge. Therefore, the point pressing method used in this scheme is conducive to the uniform distribution of glue on the irregular sponge composite surface, and forms a transition layer with relatively uniform thickness on one side of the sponge composite surface. If this transition layer is uneven, it will not only affect the overall feel of the composite material, but also cause unevenness on one side of the sponge.

[0025] The glue scraping roller 10 drives the glue on the silicone skin layer to be distributed again. Due to the irregularity of the sponge composite surface, the glue distribution on the silicone skin layer composite surface, which was originally evenly coated, is not uniform after the two materials are separated again. After the glue scraping roller 10 rolls it, the glue on its surface can be even again.

[0026] The sponge composite sheet prepared by the scheme has stable hand feel, high strength, uniform material thickness and good integrity.

[0027] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A composite structure of silicone leather and polyurethane sponge, characterized in that: The invention comprises a sponge layer feeding roller (1), a silicone layer feeding roller (2), a glue coating structure (3), a glue dipping structure, a rolling structure (4) and a winding structure, wherein the glue dipping structure comprises a plurality of glue dipping units, and the glue dipping units comprise a vibration groove (5) with an opening facing upward, a plurality of steel balls (6) located in the vibration groove (5) and a magnetic roller (7) rotatably connected to the opening of the vibration groove (5), a plurality of magnetic suction parts (8) are evenly arranged on the circumferential surface of the magnetic roller (7), and the glue coating structure (3) is applied to the composite of the silicone layer. After the surface is coated with glue, it passes through the magnetic roller (7) of the first dipping unit, the rolling structure (4) rolls the composite layer drawn out from the last dipping unit, and the winding structure winds up the rolled composite layer. The rotation of the magnetic roller (7) can make the steel balls (6) in the vibration groove (5) adsorbed on the outer surface of the silicone layer at the magnetic roller (7). The steel balls (6) adsorbed by the magnetic force of the magnetic roller (7) can break away from the adsorption of the magnetic roller (7) and fall into the vibration groove (5) during the gradual separation of the silicone layer and the magnetic roller (7).

2. A composite structure of silicone leather and polyurethane sponge according to claim 1, characterized in that: A sponge traction roller (12) for traction of the sponge layer and a silicone traction roller (9) for traction of the silicone layer are arranged between adjacent dipping units, the sponge traction roller (12) being located above the silicone traction roller (9), and the composite structure further comprising a scraping roller (10) corresponding one-to-one to the silicone traction roller (9) and cooperating with the silicone traction roller (9) to clamp the silicone layer.

3. A composite structure of silicone leather and polyurethane sponge according to claim 1 or 2, characterized in that: The magnetic attraction member (8) is a permanent magnetic strip parallel to the axis of the magnetic roller (7).

4. A composite structure of silicone leather and polyurethane sponge according to claim 1 or 2, characterized in that: The magnetic member is an electromagnetic strip in the shape of a strip parallel to the axis of the magnetic roller (7).

5. A composite structure of silicone leather and polyurethane sponge according to claim 1 or 2, characterized in that: The outer wall of the magnetic roller (7) is coated with a buffer layer (11).

Images