Polyurethane mixed color floor and preparation method thereof

Abstract

The present invention relates to a polyurethane mixed-color floor and its preparation method, belonging to the technical field of imitation wood flooring. The floor comprises a base plate and a polyurethane covering layer covering the base plate. The decorative surface of the polyurethane covering layer is provided with an engraving based on a mold relief pattern. A color layer is also provided on the decorative layer, the color layer comprising a first color resin layer and a second color resin layer. The second color resin layer covers the decorative layer, and the first color resin layer is provided on the second color resin layer and partially covers the second color resin layer. The present invention uses a mold method to apply two color resin layers to the engraving on the decorative surface of the polyurethane surface layer. The second color resin layer is darker in color and fully covers the engraving, while the first color resin layer is lighter in color and partially covers the second color resin layer. This creates a composite effect, resulting in a highly simulated wood grain engraving with the texture of real wood.

Description

Technical Field

[0001] The invention relates to a floor whose surface material is polyurethane, in particular to a polyurethane mixed-color floor and a preparation method thereof, belonging to the technical field of imitation wood flooring. Background Art

[0002] Elastomers, such as natural rubber, synthetic rubber, and thermoplastic elastomers, all offer a pleasant touch, softness, and excellent elasticity. These characteristics give boards with elastomeric surfaces an unparalleled advantage over other materials in decorative applications, particularly for indoor or outdoor flooring.

[0003] The patent document with the authorization announcement number GB2445714B discloses a board. The board has an elastic surface and a hard foamed core layer as a support beam. Its surface layer and core layer are both made of polyurethane, so its surface layer and core layer can be fused into one without the use of adhesives, and cannot be peeled off. It does not use any peelable technical means to connect the two. Since polyurethane as the core layer is made using a foaming process, the strength of the thermosetting polyurethane material as a support beam after foaming cannot fully meet the various strength requirements of the board in application scenarios. Therefore, its polyurethane core layer improves the strength of the entire core layer by mixing a certain amount of fiber. Due to the elasticity of the surface, the core layer is strengthened by fibers, and the two layers have good bonding due to the use of the same material, so it has good touch and strength and is widely welcomed by the market.

[0004] However, although the wood texture of the decorative surface of the board is deeply engraved and has a high degree of simulation in shape, its color surface is too single and completely dependent on the base color of the board. Therefore, overall, there is still a certain gap with the real wood texture. Summary of the Invention

[0005] The present invention aims to solve the above problems and thus provides a polyurethane mixed color floor. By applying two color resin layers on the polyurethane surface, the board exhibits a real wood texture and texture, significantly improving the product quality.

[0006] The technical solutions of the present invention for solving the above problems are as follows:

[0007] A polyurethane mixed-color floor comprises a substrate and a polyurethane covering layer covering the substrate, wherein the decorative surface of the polyurethane covering layer is provided with an engraving based on a mold relief pattern; a color layer is further provided on the decorative layer, wherein the color layer comprises a first color resin layer and a second color resin layer; the second color resin layer covers the decorative layer, and the first color resin layer is provided on the second color resin layer and partially covers the second color resin layer.

[0008] As a preferred embodiment of the above technical solution, the color depth of the first color resin layer is shallower than that of the second color resin layer.

[0009] As a preferred embodiment of the above technical solution, a topcoat layer is further provided on the color layer.

[0010] Another object of the present invention is to provide a method for preparing the above-mentioned polyurethane mixed-color floor.

[0011] A method for preparing a polyurethane mixed-color floor comprises the following steps:

[0012] 1) Provide a mold with a relief pattern;

[0013] 2) Spray release agent on the relief pattern;

[0014] 3) Use the first color resin to spray partially on the relief pattern;

[0015] 4) Use the second color resin to spray on the relief pattern;

[0016] 5) Pour in the liquid material used to form the polyurethane covering layer;

[0017] 6) Before the liquid material solidifies, a substrate is placed in the mold so that the liquid material at least covers the surface of the substrate in contact with it;

[0018] 7) Mold closing and curing;

[0019] 8) Open the mold, take out, and make the polyurethane mixed color floor.

[0020] As a preferred embodiment of the above technical solution, the relief pattern is a wood texture.

[0021] As a preferred embodiment of the above technical solution, the release agent is a wax-type release agent.

[0022] As a preferred embodiment of the above technical solution, the topcoat is a polyurethane in-mold paint.

[0023] As a preferred embodiment of the above technical solution, the first color resin is PU paint, and the second color resin is PU paint.

[0024] As a preferred embodiment of the above technical solution, the liquid material is a mixture of polyurethane material A and material B.

[0025] As a preferred embodiment of the above technical solution, the second color resin is sprayed for full coverage.

[0026] As a preferred embodiment of the above technical solution, between step 2) and step 3), a step of applying a topcoat on the relief pattern is further provided.

[0027] As a preferred embodiment of the above technical solution, a groove with a necking structure is engraved on the upper surface of the substrate.

[0028] In summary, the present invention has the following beneficial effects:

[0029] The present invention adopts a mold method to apply two color resin layers on the carvings of the decorative surface of the polyurethane surface layer. The second color resin layer is darker in color and fully covers the carvings, and the first color resin layer is lighter in color and partially covers the second color resin layer, thereby producing a composite effect, so that the wood texture carvings have a high degree of simulation and have the texture of real wood. DETAILED DESCRIPTION

[0030] The following specific embodiments are merely explanations of the present invention and are not intended to limit the present invention. Any changes made by those skilled in the art after reading the specification of the present invention will be protected by patent law as long as they are within the scope of the claims.

[0031] Example 1

[0032] A polyurethane mixed-color flooring comprises a base plate and a polyurethane cover layer covering the base plate. The decorative surface of the polyurethane cover layer is provided with a wood grain pattern based on a mold relief pattern. A color layer is provided on the decorative layer, comprising a first color resin layer and a second color resin layer. The second color resin layer covers the decorative layer, the first color resin layer being provided on the second color resin layer and partially covering the second color resin layer. The color depth of the first color resin layer is lighter than that of the second color resin layer. A topcoat layer is also provided on the color layer.

[0033] A method for preparing a polyurethane mixed-color floor comprises the following steps:

[0034] 1) Provide a mold with a raised wood grain relief pattern;

[0035] 2) Spray release agent on the relief pattern;

[0036] 3) allowing the release agent to mature; the release agent is magnesium stearate;

[0037] 4) Apply topcoat on the relief pattern; the topcoat is polyurethane in-mold paint;

[0038] 5) Use the first color resin to partially spray on the relief pattern; the first color resin is PU paint;

[0039] 6) Use the second color resin to spray the relief pattern completely; the second color resin PU paint;

[0040] 7) Pour in a liquid material for forming a polyurethane covering layer; the liquid material comprises the following components: 2200g of polyether polyol, 15g of talc, 600g of isocyanate, and 4g of curing agent;

[0041] 8) Before the liquid material solidifies, a substrate is placed in the mold so that the liquid material at least covers the surface of the substrate in contact with it; a groove with a constriction structure is engraved on the top of the substrate;

[0042] 9) Mold closing and curing;

[0043] 10) Open the mold, take out the product, and make the polyurethane mixed color floor, numbered PU-1.

[0044] Comparative Example 1

[0045] A polyurethane floor comprises a base plate and a polyurethane covering layer covering the base plate, wherein a decorative surface of the polyurethane covering layer is provided with a wood grain pattern based on a mold relief pattern; a color layer is provided on the decorative layer, the color layer covering the decorative layer; and a topcoat layer is provided on the color layer.

[0046] The preparation method of the polyurethane floor comprises the following steps:

[0047] 1) Provide a mold with a raised wood grain relief pattern;

[0048] 2) Spray release agent on the relief pattern;

[0049] 3) allowing the release agent to mature; the release agent is magnesium stearate;

[0050] 4) Apply topcoat on the relief pattern; the topcoat is polyurethane in-mold paint;

[0051] 5) Use PU paint to fully cover the relief pattern;

[0052] 6) Pour in a liquid material for forming a polyurethane covering layer; the liquid material comprises the following components: 2200g of polyether polyol, 15g of talc, 600g of isocyanate, and 4g of curing agent;

[0053] 7) Before the liquid material solidifies, a substrate is placed in the mold so that the liquid material at least covers the surface of the substrate in contact with it; a groove with a constriction structure is engraved on the top of the substrate;

[0054] 8) Mold closing and curing;

[0055] 9) Open the mold, take out, and make the polyurethane floor, numbered PU-D-1.

[0056] The two floors numbered PU-1 and PU-D-1 were observed with the naked eye respectively. Through comparison, it can be seen that the floor numbered PU-1 has multi-level color changes. The transition between different levels of color is natural, showing changes in light and dark and texture transitions, and has a better real wood feel.

Claims

1. A method for preparing a polyurethane mixed color floor, The polyurethane mixed color floor comprises a substrate and a polyurethane covering layer covering the substrate, the decorative surface of the polyurethane covering layer is provided with an engraving based on a mold relief pattern; a color layer is also provided on the decorative surface, and the color layer comprises a first color resin layer and a second color resin layer; the second color resin layer covers the decorative surface, the first color resin layer is provided on the second color resin layer, and partially covers the second color resin layer; the color depth of the first color resin layer is shallower than that of the second color resin layer; it is characterized in that The preparation method comprises the following steps: 1) Provide a mold with a relief pattern; 2) Spray release agent on the relief pattern; 3) Use the first color resin to locally spray on the relief pattern; the first color resin is PU paint; 4) Use a second color resin to spray on the relief pattern; the second color resin is PU paint; 5) Pour in the liquid material used to form the polyurethane covering layer; 6) Before the liquid material solidifies, a substrate is placed in the mold so that the liquid material at least covers the surface of the substrate in contact with it; 7) Mold closing and curing; 8) Open the mold, take out, and make the polyurethane mixed color floor.

2. The method for preparing a polyurethane mixed color floor according to claim 1, characterized in that: The relief pattern is a wood texture.

3. The method for preparing a polyurethane mixed color floor according to claim 1, characterized in that: The release agent is a wax type release agent.

4. The method for preparing a polyurethane mixed color floor according to claim 1, characterized in that: The liquid material is a mixture of polyurethane material A and material B.

5. The method for preparing a polyurethane mixed color floor according to claim 1, characterized in that: Between steps 2) and 3), a step of applying a top coat of paint on the relief pattern is also included.

6. The method for preparing a polyurethane mixed color floor according to claim 5, characterized in that: The topcoat is polyurethane in-mold paint.