CN115091821B - Composite membrane containing solid layer, preparation method thereof and application thereof in plastic molded product - Google Patents

Composite membrane containing solid layer, preparation method thereof and application thereof in plastic molded product Download PDF

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Publication number
CN115091821B
CN115091821B CN202210802383.9A CN202210802383A CN115091821B CN 115091821 B CN115091821 B CN 115091821B CN 202210802383 A CN202210802383 A CN 202210802383A CN 115091821 B CN115091821 B CN 115091821B
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layer
coating
composite
coating resin
solid object
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CN115091821A (en
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李漫洵
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Guangdong Dongtian Transfer New Material Co ltd
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Guangdong Dongtian Transfer New Material Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/53—Base coat plus clear coat type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2451/00—Decorative or ornamental articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/003—Interior finishings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a composite membrane containing a physical layer, a preparation method thereof and application thereof in plastic molded products, and relates to the technical field of INS membranes. The composite membrane provided by the invention comprises a protective layer, a transparent resin layer A, a physical layer, a transparent resin layer B and a membrane layer which are sequentially arranged, wherein the physical layer has a three-dimensional grain structure. According to the composite membrane provided by the invention, the coating resin is coated on the outer layer of the solid object, the coating resin can not only be firmly contained on the surface of the solid object, but also can permeate into the gap of the solid object layer to form the solid object resin layer containing the resin, so that an integrated structure is formed, and the integrated structure can be controlled and shaped along with the thermal deformation of the coating resin layer by utilizing the deformability of the coating resin layer, so that the phenomenon of folding the solid object and the coating resin is avoided, and the pattern of the solid object layer can be perfectly represented.

Description

Composite membrane containing entity layer, preparation method thereof and application thereof in plastic molded product
Technical Field
The invention relates to the technical field of INS membranes, in particular to a composite membrane containing a solid layer, a preparation method thereof and application thereof in plastic molded products, especially in automotive upholsteries.
Background
An INS (in-mold-Molding) process, in which an INS membrane is formed by high-pressure adsorption in a forming mold in advance, is cut to form an edge, is placed in an injection mold of a product, and is then injection-molded together with molten plastic. INS membranes are indispensable insert injection membranes for protection and decoration of plastic interior trim parts in the automobile industry. The INS membrane is mainly used for door plate decoration strips, center console, instrument boards and other parts on automobile interior trim. Today's INS membranes are almost all clear-colored chemical products, generally comprising a three-layer structure. Wherein, the surface layer is a weather-resistant coating or a PMMA (polymethyl methacrylate) layer, the middle layer is a pattern layer, and the lower layer is an ABS (acrylonitrile-butadiene-styrene copolymer) sheet layer. Although the INS membrane is sometimes processed by printing a three-dimensional texture on the surface layer of the INS membrane, such a material cannot be used. The INS membrane prepared by the materials has a common decorative effect. Although some interior parts are wood grain layers, the solid wood is high in manufacturing cost, the interior parts need to be produced by combining a spraying process, and the pollution and the cost are high.
Disclosure of Invention
In order to solve the problems in the prior art, the invention mainly aims to provide a composite membrane containing a physical layer, a preparation method thereof and application thereof in automotive interior.
In order to achieve the above object, in a first aspect, the present invention provides a composite film including a physical layer, including a protective layer, a transparent resin layer a, a physical layer, a transparent resin layer B, and a film layer, which are sequentially arranged, where the physical layer has a three-dimensional texture structure.
As a preferred embodiment of the composite membrane of the present invention, the physical layer includes at least one of a wood grain sheet and a fiber fabric.
In a preferred embodiment of the composite membrane of the present invention, the transparent resin layer a and the transparent resin layer B are the same in composition, and the transparent resin layer a and the transparent resin layer B are coating resins, and the coating resins include at least one of polyurethane coating resins and water-based blocked isocyanate emulsions.
In a second aspect, the present invention further provides a method for preparing a composite membrane, including the following steps:
(1) Physical layer first coating treatment: soaking a solid object in coating resin liquid to enable the coating resin to be adhered to the surface of the solid object, and enabling the coating resin to permeate into gaps of the solid object to obtain a primary composite layer;
(2) And (3) performing secondary coating thickening treatment on the physical layer: pulling the primary composite layer out of the coating resin liquid, and allowing the primary composite layer to enter a coating thickening interval, wherein the coating thickening interval comprises double roll shafts which are sequentially arranged, and the primary composite layer sequentially passes through the double roll shafts to obtain a secondary composite layer, wherein one side surface of the real object is coated with a transparent resin layer A, and the other side surface of the real object is coated with a transparent resin layer B;
(3) Hot-pressing and bonding the protective layer: coating the surface of the protective layer with the coating resin by adopting the same treatment method as the step (1), and then carrying out hot-pressing adhesion on the protective layer and the secondary composite layer to obtain a tertiary composite layer;
(4) Thermocompression bonding of sheet layers: and coating an adhesive on one surface of the third-stage composite layer, which is far away from the protective layer, and then carrying out hot-press bonding on the three-stage composite layer and the sheet layer to obtain the composite membrane.
As a preferred embodiment of the preparation method of the composite membrane of the present invention, in the step (1), a silica gel double roll shaft with an epitaxial stretching structure is used to provide a stretching force.
As a preferable embodiment of the preparation method of the composite membrane of the invention, ultrasonic assistance is adopted in the coating treatment process of the step (1)Osmotic immersionAnd (4) coating.
As a preferred embodiment of the preparation method of the composite membrane sheet of the present invention, in the coating thickening interval in the step (2), the double roll shaft is provided withConcave recessThe heating double-roll shaft of the feeding structure is characterized in that the number of the double-roll shafts is more than or equal to 3, and the double-roll shafts are arranged at intervals in the vertical direction.
In a preferred embodiment of the method for manufacturing a composite membrane sheet according to the present invention, in the coating thickening section in step (2), the two rollers of the dual rollers rotate in opposite directions.
In a preferred embodiment of the preparation method of the composite membrane of the present invention, two roll shaft surfaces of the double roll shaft are provided with outwardly protruding roll pins, and the roll pins include at least one of round-head roll pins and pointed roll pins.
As a preferred embodiment of the preparation method of the composite membrane, the length of the round-head roller needle is smaller than that of the pointed roller needle, and the length of the pointed roller needle is larger than the distance between the primary composite layer and the surface of the roller shaft.
As a preferred embodiment of the preparation method of the composite membrane, the protective layer in the step (3) is made of a parasitic film; the material of the sheet layer in the step (4) is ABS sheet orPCThe sheet material, the gluing agent is ABS glue.
In a third aspect, the invention further provides an application of the composite membrane in a plastic molding product, in particular an application in the preparation of automotive interior parts. Wherein the composite membrane is prepared into the automotive upholstery through an INS process.
Compared with the prior art, the invention has the beneficial effects that:
(1) The composite membrane provided by the invention directly takes the solid object layer as a decoration carrier, and the solid object layer is beautiful and natural in molding, so that the decoration effect of the membrane can be improved, and the composite membrane is suitable for protecting and decorating plastic injection molding products such as automobiles;
(2) According to the composite membrane provided by the invention, the coating resin is coated on the outer layer of the solid object, the coating resin can be firmly contained on the surface of the solid object and can also permeate into the gap of the solid object layer, so that an integrated structure is formed, the integrated structure can be controlled and shaped along with the thermal deformation of the coating resin layer by utilizing the deformability of the coating resin layer, the folding phenomenon of the solid object and the coating resin is avoided, and the three-dimensional texture structure of the solid object layer can be perfectly presented;
(3) In the preparation method of the composite membrane, a special double-roll shaft structure is adopted, so that the thickness of the transparent resin layer can be controllably adjusted, the coating resin can enter the solid body layer body in the coating thickening process, and the bonding capability between the solid body layer and the transparent resin layer (comprising the transparent resin layer A and the transparent element layer B) is further improved.
Drawings
FIG. 1 is a schematic structural diagram of a composite membrane according to an embodiment of the present invention;
FIG. 2 is a flow chart of an apparatus according to the method for manufacturing a composite membrane of the present invention;
FIG. 3 is a schematic structural view of a silica gel dual roll shaft according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a dual roll shaft according to an embodiment of the present invention;
FIG. 5 is a schematic view of a dual roll shaft according to an embodiment of the present invention;
fig. 6 is a schematic structural view of the plastic molded article in embodiment 1 of the present invention.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described by the following specific examples.
The present specification provides a composite sheet, as shown in fig. 1, comprising a protective layer, a transparent resin layer a, a physical layer, a transparent resin layer B, and a sheet layer, which are arranged in this order. The solid layer may be selected from a wood grain sheet, a fiber fabric, and other sheet materials having a three-dimensional grain structure. Compared with the traditional pattern layer, the wood grain sheet or the fiber fabric and other materials have special grain effects, so that the decorative effect of beauty and three-dimensional can be displayed.
The transparent resin layer A and the transparent resin layer B are the same in component and are coating resins, and the coating resins are thermoplastic deformation and weather-resistant transparent materials and can be selected from at least one of polyurethane coating resins and water-based closed isocyanate emulsion. The coating resin can fill the gap existing in the coiled real object under certain setting operation, and coat the surface of the real object, so that the real object is completely and firmly contained in the coating resin to form an integrated structure. The solid object layer which is firmly contained in the coating resin is controlled and shaped along with the thermal deformation of the coating resin, and is always kept in a relatively stable state, so that the phenomenon of layer folding between the solid object and the coating resin is avoided.
The present specification further provides a method for manufacturing a composite membrane, which includes the following steps, with reference to fig. 2 to 5:
(1) First coating treatment of the physical layer (corresponding to part a in fig. 2): soaking a solid object in coating resin liquid to enable the coating resin to be adhered to the surface of the solid object, and enabling the coating resin to permeate into gaps of the solid object to obtain a primary composite layer;
in some embodiments, in step (1), a silicone double roller shaft with an epitaxial stretching structure (as shown in fig. 3) may be used to provide a stretching force, and the pulling action of the silicone double roller shaft with the epitaxial stretching structure is used to immerse the rolled solid object in the paint resin liquid tank, so that the paint resin permeates into the gaps of the solid object and gradually fills up the gap in the solid object, and the greater the amount of the filled coating in the gap, the greater the bonding force between the solid object and the paint resin, the less the solid object is easily disassembled by a strong force. In addition, the silica gel double-roll shaft of the extension stretching structure can appropriately extend and pull apart and flatten the solid object in the process of traction stretching. The silica gel double roll shafts with the extension stretching structures are made of swelling-resistant silica gel materials, the surface of each silica gel roll shaft is slightly provided with a concave radian, and the surface of each silica gel roll shaft is provided with shallow textures with outward rotary stretching effects. Under the action of the silica gel double roll shafts, the physical body can be stretched, flattened and spread to the maximum extent, so that the gap is expanded as much as possible.
In some embodiments, ultrasound-assisted coating may also be employed during the coating process of step (1). By the ultrasonic vibration effect, the coating resin can deeply penetrate into the small spacing gaps of the solid object to fill the small spacing gaps existing in the solid object, so that the bonding tightness of the solid object and the coating resin is further ensured.
(2) The physical layer is coated and thickened for the second time (corresponding to part B in fig. 2): pulling the primary composite layer out of the coating resin liquid, and allowing the coating resin liquid to enter a coating thickening interval, wherein the coating thickening interval comprises double roll shafts which are sequentially arranged, and the primary composite layer sequentially passes through the double roll shafts to obtain a secondary composite layer, wherein a transparent resin layer A is coated on one side surface (corresponding to the upper surface or the lower surface) of the real object, and a transparent resin layer B is coated on the other side surface (corresponding to the lower surface or the upper surface) of the real object;
in the step, the coiled solid object filled with the coating resin in the gap is stretched out of the liquid level in the coating resin tank at a constant speed, and then the surface of the coiled solid object is coated and thickened, so that the thickness of the transparent resin layer on the surface of the solid object is regulated and controlled in the step.
In some embodiments, in the coating thickening section in the step (2), the double rollers are heating double rollers with a feeding structure, and the two rollers of the double rollers rotate in a mode of opposite rotation (as shown in fig. 4).
In some embodiments, the number of the double roller shafts is more than or equal to 3, and the double roller shafts are arranged at intervals along the vertical direction. The number of the double roller shafts in the part B in fig. 2 is 5, and the 5 double roller shafts are arranged at intervals in the vertical direction. The coiled object filled with the coating resin is pulled out of the liquid level filled in the coating resin tank at a constant speed, and then sequentially penetrates through the hollow positions set by the two heatable roll shafts, and the coating resin is sequentially supplemented along with the rise of the height within the thickness range limited by the two roll shafts, so that the coating resin layer continuously wraps the solid object to form a whole.
Double-roll shaft in the actual traction, the heating temperature of the No. 1 double-roll shaft can be set to be 50-80 ℃, so that the coating resin just leaving from the liquid surface starts to be heated and gradually cured, and the positioning of a real object in the coating resin layer is synchronously realized. The upper parts of No. 1-3 double roll shafts can be synchronously and continuously supplemented with coating resin, so that the thickened supplement and maintenance of the thickness of the liquid surface coating just leaving the coating resin tank are required. After the coating containing the solid object passes through the No. 1 double-roll shaft, the temperature of the No. 2 double-roll shaft can be increased to 100 ℃ or above when the coating containing the solid object passes through the concave part below the No. 2 double-roll shaft, and the shaping of the solid object on the coating resin layer is further fixed. And then, sequentially passing through the No. 3-5 double-roll shafts to continue heating and curing, and sequentially stabilizing the solid object in the position of the coating resin layer for stable shaping.
It should be understood that the number of the double roller shafts shown in the portion B of fig. 2 does not have a limiting effect on the number of the double roller shafts of the present invention, and those skilled in the art can adjust the number of the double roller shafts according to actual needs. Moreover, the position relationship of the multiple double roller shafts is not limited to be arranged in sequence in the vertical direction, and a person skilled in the art can adjust the position relationship between the double roller shafts according to actual needs, for example, the double roller shafts can be arranged at a certain inclination angle in the vertical direction.
Because the double-roll shaft is in a tight contact state of fastening and rotating oppositely, and the middle of the roll shaft of the double-roll shaft is provided with the concave depth which can be determined by the required thickness of the coating, namely, the concave depth of the double-roll shaft ensures the thickness of the real object and the coating (the transparent resin layer A + the transparent resin layer B) on two sides.
In some embodiments, both roll shaft surfaces of the dual roll shaft are provided with outwardly protruding pins including at least one of round-headed pins and pointed pins. Wherein the thickness of the circle (transparent resin layer A + transparent resin layer B), and the length of the solid object layer at the coating resin head roller pin determines the position of the solid object layer in the coating resin layer and the position of the solid object double-side coating resin layer and the thickness of the solid object double-side coating layer, and further determines the degree of controlled deformation of the solid object firmly contained in the coating resin layer according to the thermal deformation of the coating resin layer. For example, when the solid object layer is a wood grain solid object, and the thickness of the coating resin layer on the upper surface of the solid object layer is larger than that on the lower surface of the solid object, the degree of deformation increases with the thickness of the surface layer.
Although the solid body layer of the solid wood grain is beautiful and natural in molding, the coating resin permeated into the wood grain has the phenomenon of lacking the coating resin and layer detaching because the wood grain is dense, thereby seriously affecting the quality of finished products. In the specification, the pointed roller needle is arranged on the surface of the double-roller shaft, and the pointed roller needle can penetrate through a solid object, so that more coating resin can permeate into the solid object, and the coating resin is ensured to completely wrap the whole solid object. In the actual use process, can use the combination of round head roller needle and sharp-pointed roller needle, also can go into to use round head roller needle or only use sharp-pointed roller needle. In the double roller structure shown in fig. 5, the roller pins have a linear structure on the roller surface. It will be appreciated that the rollers may be arranged in other ways than in a linear arrangement on the roller surface.
In some embodiments, when the roller surface of the dual roller is provided with the round-head roller pins and the pointed roller pins, the length of the round-head roller pins is less than that of the pointed roller pins, and the length of the pointed roller pins is greater than the distance between the primary composite layer and the roller shaft. Therefore, the thickness of the coating resin on the surface layer of the solid object can be adjusted through the length of the round-head roller needle while the sharp-head roller needle can pierce the solid object.
It should be understood that the double roll pin configuration is used only in the corresponding double roll shaft when the coating resin is not fully cured. Typically, it is used in twin rolls No. 1 and No. 2 in fig. 2.
In this specification, the concave distance between the two rollers and the position limit of the real object on the coating resin layer can be adjusted according to actual conditions (such as deformation degree, real object type, real object thickness, etc.). For example, as shown in table 1 below, table 1 shows a control of optional parameters in some embodiments. It should be understood that other suitable parameters besides those shown in table 1 may be selected according to actual conditions.
TABLE 1
Figure BDA0003734495380000071
In some embodiments, the surface of the dual roller may be arranged to have a sub-surface effect, which may increase the bonding force with the surface of the primary composite layer when the coating resin layer is re-adhered.
(3) Hot-pressing and bonding the protective layer: coating the surface of the protective layer with the coating resin by adopting the same treatment method as the step (1), and then carrying out hot-pressing adhesion on the protective layer and the secondary composite layer to obtain a tertiary composite layer;
in this step, the coating resin layer containing the solid object is adhered to the protective layer coated with the same coating resin layer by the heat and pressure of the No. 1 double press roll shaft in the oven 2 shown in fig. 2, and thereby thickened. The protective layer is obtained by coating resin quantitatively on the roller shaft 1 in the part C shown in figure 2, drying in the oven 1, and performing hot-press bonding with the secondary composite layer in the roller shaft No. 1 pressed in the oven 2.
In some embodiments, the material of the protection layer may be a carrier film.
(4) Thermocompression bonding of sheet layers: and coating an adhesive on one surface of the third-level composite layer, which is far away from the protective layer, and then carrying out hot-press bonding on the three-level composite layer and the sheet layer to obtain the composite membrane.
In the step (4), the surface of the three-stage composite layer after being pressed by No. 1 is coated with the adhesive in the region D after the adhesive is coated on the surface, which is far away from the protective layer, and then the upper sheet layer is adhered under the action of heat and pressure of the No. 2 double-roll shaft, so that the composite membrane with the five-layer structure is obtained. The composite membrane is a membrane with thermoplastic deformability.
In some embodiments, the sheet layer is made of an ABS sheet, and the adhesive is an ABS adhesive.
The composite membrane provided by the specification can be used for preparing automotive upholstery. Specifically, the INS film can be firstly punched and cut into pieces according to the production process requirements of the INS film, the pieces are placed in a shaping mold for heating forming, the pieces are cut according to the size of an injection sub-mold of a corresponding mold and placed in an injection mold for injection forming, and in the hot forming, the injection forming is deblocked and cured at the temperature of 200 ℃, so that the surface strength is improved, and the INS film becomes a plastic product for protecting and decorating automobile electric appliances and the like.
Example 1
The composite membrane provided by the embodiment is used for providing the composite membrane with the solid wood texture patterns (the solid object layer is a solid wood texture solid object), and the provided composite membrane can be used for surface protection and decoration of an automobile plastic molding workpiece. The modeling structure of the plastic molding workpiece is shown in fig. 6, and the bending angles of the plastic molding workpiece are respectively required to be R =2, R =2.5 and R =15, wherein R =2 is a limited bending degree which is difficult to form.
This example prepares a composite membrane as follows:
(1) The coiled solid wood grain solid objects are soaked in a coating resin liquid tank through the traction effect of a silica gel double-roll shaft with an extension stretching structure, the stretching speed is set to be 10m/min, the solid objects are properly extended and pulled out and flattened through the silica gel double-roll shaft, the coating resin penetrates into small-interval gaps deeply through the ultrasonic vibration effect, and the small-interval gaps existing among the solid objects are filled.
(2) The coiled solid wood grain entity filled with the coating resin is pulled out of the liquid surface filled with the coating resin tank at a constant speed, enters a hollow position set by a double-roll shaft with heating and liquid guiding functions at a speed of 10m/min and passes through the hollow position after leaving the coating resin tank, and the coating resin is sequentially supplemented along with the increase of the height within the thickness range defined by the double-roll shaft;
round-head roller pins and pointed roller pins are arranged on the double roller shafts, and in the step (2), the position of the solid wood grain sheet in the coating resin is 20um away from the surface layer under the limitation of R =2. Therefore, the round head roller pin positions are designed to be 20um and 10um positions, so that the position of the wood grain sheet kept on the coating resin layer is controlled, and the thickness of the surface layer is ensured to be larger than 20um (refer to table 1);
(3) The coating resin layer containing the solid body is adhered to the protective layer coated with the same coating resin layer and thickened by the heat and pressure of the double-roll shaft No. 1 in the oven 2 shown in fig. 2. The protective layer is obtained by coating a coating resin on a carrier film quantitatively through a roll shaft 1 in a part C as shown in figure 2, drying the carrier film in an oven 1, and performing hot-press bonding on one surface of the coating resin layer containing a real object in a No. 1 roll shaft 2 of the oven;
(4) Coating an ABS adhesive on the D area 2 through the solid coating resin layer after pressing No. 1, and adhering an ABS sheet layer under the action of heat and pressure of a double-roll shaft pressing No. 2, thereby obtaining the composite membrane with the five-layer structure.
Cutting the composite membrane into a stack according to the length requirement of an injection molding part, and placing the cut sheet into a hot-pressing die matched with the drawing size shown in figure 6 for molding to obtain a molded membrane; and (4) placing the diaphragm into an injection mold, and performing injection molding on the plastic product to obtain the injection molding part. Because the thermoforming temperature is above 200 ℃, the closed curing agent can be used for thoroughly unsealing, and the surface protection capability of the product is further improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (9)

1. The preparation method of the composite membrane containing the entity layer is characterized by comprising a protective layer, a transparent resin layer A, the entity layer, a transparent resin layer B and a membrane layer which are sequentially arranged, wherein the entity layer has a three-dimensional grain structure, the components of the transparent resin layer A and the transparent resin layer B are the same, the entity layer comprises at least one of wood grain sheets and fiber fabrics, the transparent resin layer A and the transparent resin layer B are coating resins, and the preparation method of the composite membrane comprises the following steps:
(1) Physical layer first coating treatment: soaking the solid body layer in coating resin liquid to enable the coating resin to be adhered to the surface of the solid body, and enabling the coating resin to permeate into gaps of the solid body to obtain a primary composite layer;
(2) And (3) performing secondary coating thickening treatment on the physical layer: pulling the primary composite layer out of the coating resin liquid, and allowing the coating resin liquid to enter a coating thickening interval, wherein the coating thickening interval comprises two roll shafts which are sequentially arranged, the two roll shafts are heating double roll shafts with a feeding structure, the number of the double roll shafts is more than or equal to 3, and the primary composite layer sequentially passes through the double roll shafts to obtain a secondary composite layer, one side surface of the real object is coated with a transparent resin layer A, and the other side surface of the real object is coated with a transparent resin layer B;
(3) Hot-pressing and bonding the protective layer: coating the surface of the protective layer with the coating resin by adopting the same treatment method as the step (1), and then carrying out hot-press bonding on the protective layer and the secondary composite layer to obtain a tertiary composite layer;
(4) Thermocompression bonding of sheet layers: and coating an adhesive on one surface of the third-level composite layer, which is far away from the protective layer, and then carrying out hot-press bonding on the three-level composite layer and the sheet layer to obtain the composite membrane.
2. The method of claim 1, wherein the coating resin comprises at least one of a polyurethane coating resin and a water-based blocked isocyanate emulsion.
3. The method according to claim 1, wherein the step (1) uses a silica gel dual roll with an epitaxial stretching structure to provide the stretching force.
4. The method of claim 1, wherein the step (1) of coating is performed by ultrasonic assisted coating.
5. The method for preparing a composite film according to claim 1, wherein in the coating thickening section in the step (2), two rollers of the double rollers rotate in a manner of opposite rotation.
6. The method for preparing a composite film according to claim 5, wherein the roll shaft surfaces of the double roll shaft are provided with outwardly protruding pins comprising at least one of round-headed pins and pointed pins.
7. The method of making a composite film of claim 6 wherein said pins comprise rounded pins and pointed pins, said rounded pins having a length less than said pointed pins, said pointed pins having a length greater than the distance of said primary composite layer from the surface of the roll.
8. The method according to claim 1, wherein the protective layer in step (3) is made of a parasitic film; and (4) the sheet layer in the step (4) is made of an ABS sheet or a PC sheet, and the adhesive is ABS adhesive.
9. Use of the composite film prepared by the method according to any one of claims 1 to 8 in plastic molded articles.
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