Laser-engraved automotive trim polyurethane synthetic leather and preparation method thereof

Abstract

The invention relates to a laser-carved automotive trim polyurethane synthetic leather and a preparation method thereof, a predetermined pattern is formed on the laser-carved automotive trim polyurethane synthetic leather through a laser-carved process, and the laser-carved automotive trim polyurethane synthetic leather sequentially comprises a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer and a base cloth layer from outside to inside. According to the invention, the transparent barrier layer is arranged on the foaming layer, so that color migration generated by laser etching in a high-temperature oxidation process can be effectively blocked, and stable colors of different batches of products after laser etching are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather, and in particular to a laser-engraved polyurethane synthetic leather for automobile interior decoration and a preparation method thereof. Background Art

[0002] With the development of society, the demand for leather products for automobile interiors is increasing. The performance of artificial leather and synthetic leather, especially polyurethane synthetic leather, is getting closer and closer to natural leather. In some aspects, the performance even exceeds that of natural leather. It once became the first choice for automobile interior leather.

[0003] With the progress of science and technology, laser engraving technology has also developed rapidly. Laser engraving, also known as laser engraving or laser marking, is a process that uses laser as a processing medium for surface treatment. Since laser engraving does not contact the surface of the material, it is easy to process products of various materials. It has high processing precision and fast speed and is widely used, including engraving of automotive interior leather. Laser engraving mainly causes the color paste to change color and fade away the previous color through high-temperature oxidation. However, since the current automotive leather processes are basically multi-layer processes, the foaming layer is thick, the pores are large, and there are a lot of fillers inside. When the color paste is oxidized at high temperature, it will migrate to the foaming layer and it is difficult to decolorize the foaming layer through high-temperature oxidation, resulting in unstable color of synthetic leather batches. Summary of the invention

[0004] Based on this, in order to solve the problems existing in the prior art, the purpose of the present invention is to provide a laser-engraved polyurethane synthetic leather for automotive interior and a preparation method thereof. The laser-engraved polyurethane synthetic leather for automotive interior can effectively isolate the color migration problem during the high-temperature oxidation process caused by laser engraving, thereby ensuring the color stability of the product after laser engraving.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention provides a laser-engraved polyurethane synthetic leather for automobile interior decoration, on which a predetermined pattern is formed by a laser-engraving process, and which comprises a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer, and a base fabric layer from the outside to the inside.

[0007] The present invention arranges a transparent barrier layer on the foaming layer, and the high-temperature oxidation generated during laser engraving acts on the surface treatment layer, the surface layer, the transparent barrier layer, and the foaming layer in turn from the outside to the inside of the product. The color paste in the surface layer is oxidized by high temperature, and a small amount of color remaining in the contact area between the surface layer and the transparent barrier layer will migrate to the surface of the transparent barrier layer. When the laser engraving continues, the color migrated to the surface of the transparent barrier layer will be oxidized again, thereby effectively blocking the migration of color during the high-temperature oxidation process generated by the laser engraving, thereby ensuring that the foaming layer will not be contaminated by color, and ensuring the color stability of different batches of products after laser engraving.

[0008] As a further improvement of the above scheme of the present invention, the transparent barrier layer is prepared from a transparent barrier layer polyurethane colorless slurry, and the transparent barrier layer polyurethane colorless slurry is prepared from the following components in parts by weight: 100-150 parts of a transparent barrier layer polyurethane resin, 1-2 parts of a wear-resistant additive, and 0.1-0.5 parts of a leveling agent;

[0009] And / or, the polyurethane resin of the transparent barrier layer is at least one of polyether polyurethane, polyester polyurethane and polycarbonate polyurethane.

[0010] As a further improvement of the above scheme of the present invention, the surface treatment layer is prepared from a water-based polyurethane surface treatment agent, and the water-based polyurethane surface treatment agent is prepared from the following components in parts by weight: 100-120 parts of water-based polyurethane resin, 30-80 parts of water, 3-5 parts of blocked isocyanate cross-linking agent, 0.1-0.5 parts of leveling agent, and 0.1-0.5 parts of defoaming agent.

[0011] As a further improvement of the above scheme of the present invention, the surface layer is prepared from a surface layer polyurethane slurry, and the surface layer polyurethane slurry is prepared from the following components in parts by weight: 100-150 parts of a surface layer polyurethane resin, 1-2 parts of an ultraviolet absorber, 1-2 parts of an anti-wear additive, 0.1-0.5 parts of a leveling agent, and 15-20 parts of a color paste.

[0012] As a further improvement of the above solution of the present invention, the surface layer polyurethane resin is at least one of polyether polyurethane, polyester polyurethane and polycarbonate polyurethane.

[0013] As a further improvement of the above scheme of the present invention, the foaming layer is prepared from a foaming layer polyurethane slurry, and the foaming layer polyurethane slurry adopts a thermosetting two-component solvent-free foaming polyurethane resin, and the thermosetting two-component solvent-free foaming polyurethane resin is mixed with a polyether type combination A material and a polyether polycarbon mixed type B material prepolymer in a weight ratio of 100:70-80; the polyether type combination A material is prepared from the following components in weight parts: 100-120 parts of polyether type combination A material, 80-100 parts of aluminum hydroxide, 0.03-0.05 parts of a catalyst, and 0.3-0.5 parts of water.

[0014] The present invention provides a method for preparing the aforementioned laser-engraved polyurethane synthetic leather for automobile interior decoration, which comprises the following steps:

[0015] S1. Applying the surface polyurethane slurry to the surface of the release paper and drying the surface layer;

[0016] S2. The transparent barrier layer polyurethane colorless slurry is applied to the surface layer and dried to obtain a transparent barrier layer;

[0017] S3. The polyurethane foaming layer is coated on the transparent barrier layer, dried to semi-dry, and a semi-dry solvent-free layer is formed, and then the cloth is pasted, and the roll is rolled after drying, and the release paper is peeled off to obtain a semi-finished synthetic leather;

[0018] S4. Applying a water-based polyurethane surface treatment agent on the surface layer of the semi-finished synthetic leather, and then drying and laser engraving it to form a predetermined pattern, thereby obtaining a laser engraved automotive interior polyurethane synthetic leather.

[0019] As a further improvement of the above solution of the present invention, it also includes the following steps:

[0020] S5. Spraying a water-based polyurethane treatment agent on the predetermined area including the predetermined pattern and drying it.

[0021] As a further improvement of the above scheme of the present invention, the viscosity of the waterborne polyurethane treatment agent is 200-300 cps, and the waterborne polyurethane treatment agent is prepared from the following components in parts by weight: 100-120 parts of waterborne polyurethane resin, 100-150 parts of water, 3-5 parts of blocked isocyanate crosslinking agent, 0.1-0.5 parts of leveling agent, and 0.1-0.5 parts of defoaming agent;

[0022] And / or, the spraying of the water-based polyurethane surface treatment agent on the predetermined area including the predetermined pattern is to place a hollow spraying mold on the laser-engraved automotive interior polyurethane synthetic leather, make the hollow area of ​​the hollow spraying mold correspond to the predetermined pattern and the area of ​​the hollow area is 1.2-1.5 times the area of ​​the predetermined pattern, and spray the water-based polyurethane treatment agent into the predetermined area at a distance of 10-15 cm from the predetermined pattern;

[0023] And / or, in step S5, the drying temperature is 150-170° C. and the drying time is 4-5 min.

[0024] As a further improvement of the above solution of the present invention, in step S1, the drying temperature is 130-150°C;

[0025] And / or, in step S2, the drying temperature is 130-150°C;

[0026] And / or, in step S3, the temperature of baking to semi-dryness is 70-90°C and the time is 1-1.5 min; the temperature of drying is 100-120°C and the time is 4-5 min;

[0027] And / or, in step S4, the drying temperature is 150-170° C. and the drying time is 4-5 min.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. In the present invention, a transparent barrier layer is arranged on the foaming layer. The high-temperature oxidation generated during laser engraving acts on the surface treatment layer, the surface layer, the transparent barrier layer and the foaming layer from the outside to the inside of the product. The color paste in the surface layer is oxidized by high temperature, and a small amount of color remaining in the contact part between the surface layer and the transparent barrier layer will migrate to the surface of the transparent barrier layer. When the laser engraving continues, the color migrated to the surface of the transparent barrier layer will be oxidized again, thereby effectively blocking the migration of color in the high-temperature oxidation process generated by laser engraving, thereby ensuring that the foaming layer will not be contaminated by color, ensuring the color stability of different batches of products after laser engraving.

[0030] 2. During the preparation of the laser engraved automotive interior polyurethane synthetic leather of the present invention, the leather surface is damaged due to the high-temperature oxidation produced by the laser engraving. The present invention innovatively adopts a spraying treatment process after laser engraving, spraying a water-based polyurethane treatment agent on the predetermined graphic area of ​​the laser engraving image, and forming a dense protective layer on the damaged surface after high-temperature curing. Since the glossiness of the protective layer is consistent with the leather surface coating, there is no color difference after spraying, and the durability of the product can be greatly improved.

[0031] 3. The formula of the water-based polyurethane treatment agent of the present invention is basically consistent with the formula of the water-based polyurethane surface treatment agent, thereby effectively ensuring the color stability after spraying, without color difference and light haze difference, and the added closed cross-linking agent will not react at room temperature, which can effectively ensure the viscosity and service life of the water-based polyurethane treatment agent; the viscosity of the water-based polyurethane treatment agent is 200-300cps, in order to ensure the feeding amount of the water-based polyurethane treatment agent during spraying, too high viscosity will cause the nozzle to be unable to effectively atomize to form a uniform film during spraying. DETAILED DESCRIPTION

[0032] For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0035] LY-90NPC resin (polycarbon polyurethane), LY-58PC resin (polycarbon polyurethane), LT-50 resin (polyether polyurethane), ST-8037 resin (polyester polyurethane), color paste PU white 2A18, color paste PU black 1A71, AL-3051A, AL-5040B prepolymers are all from Hefei Anli Polyurethane New Materials Co., Ltd.;

[0036] The wear-resistant additive used is DC-57, a product of Dow Corning of the United States;

[0037] Ultraviolet absorber UV234 is a product of BASF;

[0038] Catalyst SDJT-12 is a product of Guangdong Sandingjia New Materials Technology Co., Ltd.;

[0039] Leveling agent BYK-333 and defoaming agent BYK-024 are products of BYK;

[0040] Waterborne polyurethane KTT728 is a product of Waterborne Ketian Company;

[0041] Blocked isocyanate curing agent HI100 is a product of BASF;

[0042] The 150D plain cloth is a product of Zhejiang Caidie Company.

[0043] It should be noted that the above raw material additives are only examples made to make the technical solution of the present invention clearer, and do not mean that the present invention can only use the above raw material additives. The specific scope is subject to the claims. In addition, the "parts", "number of parts", etc. mentioned in the following embodiments, unless otherwise specified, all refer to parts by weight.

[0044] Example 1

[0045] This embodiment provides a laser-engraved polyurethane synthetic leather for automotive interior decoration, which includes a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer, and a base fabric layer from the outside to the inside. The specific preparation method is as follows:

[0046] S1. Apply the surface polyurethane slurry to the surface of the release paper, heat and dry at 130°C to obtain the surface layer.

[0047] The surface polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LY-90NPC resin, 2 parts of ultraviolet absorber UV234, 2 parts of wear-resistant additive DC-57, 0.3 parts of leveling agent BYK-333, 10 parts of color paste PU white 2A18, and 5 parts of color paste PU black 1A71.

[0048] S2. Apply the transparent barrier layer polyurethane slurry to the surface layer, heat and dry it at 130° C. to obtain a transparent barrier layer.

[0049] The transparent barrier layer polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LT-50 resin, 1 part of wear-resistant additive DC-57, and 0.3 parts of leveling agent BYK-333.

[0050] S3. Apply the foaming layer polyurethane slurry on the surface of the transparent barrier layer, and then bake it at 90°C for 1 minute to form a semi-dry solvent-free layer, and then stick a 150D plain cloth base fabric; bake it in an oven at 100°C for 5 minutes, roll it up, and peel off the release paper to obtain a synthetic leather semi-finished product.

[0051] The polyurethane slurry of the foaming layer is a thermosetting two-component solvent-free foaming polyurethane, and the thermosetting two-component solvent-free foaming polyurethane resin is mixed with polyether type combination A material and AL-5040B prepolymer in a weight ratio of 100:80. The polyether type combination A material is prepared from the following components in weight: 100 parts of AL-3051A, 80 parts of aluminum hydroxide, 0.04 parts of catalyst SJDT-12, and 0.5 parts of water.

[0052] S4. A surface treatment agent is applied to the surface layer of the semi-finished polyurethane synthetic leather, and the leather is baked at 150° C. for 5 minutes. The leather is laser engraved to form a predetermined H-shaped pattern, thereby obtaining a laser engraved polyurethane synthetic leather.

[0053] The waterborne polyurethane surface treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 50 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0054] S5. Cover the surface of the laser-engraved polyurethane synthetic leather with a hollow spray mold, wherein the hollow spray mold has an H-shaped hollow area, and the area of ​​the H-shaped hollow area is 1.5 times the area of ​​the predetermined H-shaped pattern. Spray 3 presses (1L kettle, each press is about 0.5mL) of water-based polyurethane treatment agent at a distance of 10 cm from the hollow spray mold, and bake at 150°C for 5 minutes before forming.

[0055] The viscosity of the waterborne polyurethane treatment agent is 200-300 cps, and the waterborne polyurethane treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 100 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0056] Example 2

[0057] This embodiment provides a laser-engraved polyurethane synthetic leather for automotive interior decoration, which includes a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer, and a base fabric layer from the outside to the inside. The specific preparation method is as follows:

[0058] S1. Apply the surface polyurethane slurry to the surface of the release paper, heat and dry at 140°C to obtain the surface layer.

[0059] The surface polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LY-90NPC resin, 2 parts of ultraviolet absorber UV234, 2 parts of wear-resistant additive DC-57, 0.3 parts of leveling agent BYK-333, 3 parts of color paste PU white 2A18, and 15 parts of color paste PU black 1A71.

[0060] S2. Apply the transparent barrier layer polyurethane slurry to the surface layer, heat and dry it at 140° C. to obtain a transparent barrier layer.

[0061] The transparent barrier layer polyurethane slurry is prepared from the following components in parts by weight: 150 parts of LT-50 resin, 2 parts of wear-resistant additive DC-57, and 0.5 parts of leveling agent BYK-333.

[0062] S3. The foamed polyurethane slurry is coated on the surface of the transparent barrier layer, and then placed in an oven at 80°C for 1 minute to form a semi-dry solvent-free layer, and then a 150D plain cloth base fabric is attached; the layer is dried in an oven at 110°C for 4 minutes, rolled up, and the release paper is peeled off to obtain a synthetic leather semi-finished product.

[0063] The polyurethane slurry of the foaming layer is a thermosetting two-component solvent-free foaming polyurethane, and the thermosetting two-component solvent-free foaming polyurethane resin is mixed with polyether type combination A material and AL-5040B prepolymer in a weight ratio of 100:70. The polyether type combination A material is prepared from the following components in weight: 100 parts of AL-3051A, 100 parts of aluminum hydroxide, 0.04 parts of catalyst SJDT-12, and 0.3 parts of water.

[0064] S4. A surface treatment agent is applied to the surface layer of the semi-finished polyurethane synthetic leather, and the leather is baked at 170° C. for 4 minutes. After laser engraving to form a predetermined A-shaped pattern, a laser engraved polyurethane synthetic leather is obtained.

[0065] The waterborne polyurethane surface treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 70 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0066] S5. Cover the surface of the laser-engraved polyurethane synthetic leather with a hollow spray mold, wherein the hollow spray mold has an A-shaped hollow area and the area of ​​the A-shaped hollow area is twice the area of ​​the predetermined pattern of the A-shaped area. Spray 5 presses (1L kettle, each press is about 0.5mL) of water-based polyurethane treatment agent at a distance of 15cm from the hollow spray mold, and bake at 170℃ for 4min before forming.

[0067] The viscosity of the waterborne polyurethane treatment agent is 200-300 cps, and the waterborne polyurethane treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 120 parts of water, 3 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0068] Example 3

[0069] This embodiment provides a laser-engraved polyurethane synthetic leather for automotive interior decoration, which includes a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer, and a base fabric layer from the outside to the inside. The specific preparation method is as follows:

[0070] S1. Apply the surface polyurethane slurry to the surface of the release paper, heat and dry it at 150°C to obtain the surface layer.

[0071] The surface polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LY-90NPC resin, 2 parts of ultraviolet absorber UV234, 2 parts of wear-resistant additive DC-57, 0.3 parts of leveling agent BYK-333, 10 parts of color paste PU white 2A18, and 5 parts of color paste PU black 1A71.

[0072] S2. Apply the transparent barrier layer polyurethane slurry to the surface layer, heat and dry it at 150° C. to obtain a transparent barrier layer.

[0073] The transparent barrier layer polyurethane slurry is prepared from the following components in parts by weight: 100 parts of LY-58PC resin, 1 part of wear-resistant additive DC-57, and 0.1 part of leveling agent BYK-333.

[0074] S3. Apply the foaming layer polyurethane slurry on the surface of the transparent barrier layer, and then bake it at 90°C for 1 minute to form a semi-dry solvent-free layer, and then stick a 150D plain cloth base fabric; bake it in an oven at 120°C for 4 minutes, roll it up, and peel off the release paper to obtain a synthetic leather semi-finished product.

[0075] The polyurethane slurry of the foaming layer is a thermosetting two-component solvent-free foaming polyurethane, and the thermosetting two-component solvent-free foaming polyurethane resin is mixed with polyether type combination A material and AL-5040B prepolymer in a weight ratio of 100:75. The polyether type combination A material is prepared from the following components in weight: 100 parts of AL-3051A, 80 parts of aluminum hydroxide, 0.04 parts of catalyst SJDT-12, and 0.5 parts of water.

[0076] S4. A surface treatment agent is applied to the surface layer of the semi-finished polyurethane synthetic leather, and the surface layer is dried at 160° C. for 5 minutes. After laser engraving to form a predetermined H-shaped pattern, a laser engraved polyurethane synthetic leather is obtained.

[0077] The waterborne polyurethane surface treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 50 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0078] S5. Cover the surface of the laser-engraved polyurethane synthetic leather with a hollow spray mold, wherein the hollow spray mold has an H-shaped hollow area, and the area of ​​the H-shaped hollow area is 1.5 times the area of ​​the predetermined H-shaped pattern. Spray 3 presses (1L kettle, each press is about 0.5mL) of water-based polyurethane treatment agent at a distance of 10cm from the hollow spray mold, and bake at 160℃ for 5min before forming.

[0079] The viscosity of the waterborne polyurethane treatment agent is 200-300 cps, and the waterborne polyurethane treatment agent is prepared from the following components in parts by weight: 110 parts of KTT728 resin, 130 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0080] Example 4

[0081] This embodiment provides a laser-engraved polyurethane synthetic leather for automotive interior decoration, which includes a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer, and a base fabric layer from the outside to the inside. The specific preparation method is as follows:

[0082] S1. Apply the surface polyurethane slurry to the surface of the release paper, heat and dry at 130°C to obtain the surface layer.

[0083] The surface polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LY-90NPC resin, 2 parts of ultraviolet absorber UV234, 2 parts of wear-resistant additive DC-57, 0.3 parts of leveling agent BYK-333, 10 parts of color paste PU white 2A18, and 5 parts of color paste PU black 1A71.

[0084] S2. Apply the transparent barrier layer polyurethane slurry to the surface layer, heat and dry it at 130° C. to obtain a transparent barrier layer.

[0085] The transparent barrier layer polyurethane slurry is prepared from the following components in parts by weight: 130 parts of ST-8037 resin, 1.5 parts of wear-resistant additive DC-57, and 0.3 parts of leveling agent BYK-333.

[0086] S3. Apply the foaming layer polyurethane slurry on the surface of the transparent barrier layer, and then bake it at 90°C for 1 minute to form a semi-dry solvent-free layer, and then stick a 150D plain cloth base fabric; bake it in an oven at 120°C for 4 minutes, roll it up, and peel off the release paper to obtain a synthetic leather semi-finished product.

[0087] The polyurethane slurry of the foaming layer is a thermosetting two-component solvent-free foaming polyurethane, and the thermosetting two-component solvent-free foaming polyurethane resin is mixed with polyether type combination A material and AL-5040B prepolymer in a weight ratio of 100:72. The polyether type combination A material is prepared from the following components in weight: 120 parts of AL-3051A, 90 parts of aluminum hydroxide, 0.05 parts of catalyst SJDT-12, and 0.5 parts of water.

[0088] S4. A surface treatment agent is applied to the surface layer of the semi-finished polyurethane synthetic leather, and the leather is baked at 150° C. for 5 minutes. The leather is laser engraved to form a predetermined H-shaped pattern, thereby obtaining a laser engraved polyurethane synthetic leather.

[0089] The waterborne polyurethane surface treatment agent is prepared from the following components in parts by weight: 120 parts of KTT728 resin, 80 parts of water, 5 parts of blocked isocyanate crosslinking agent HI100, 0.5 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0090] S5. Cover the surface of the laser-engraved polyurethane synthetic leather with a hollow spray mold, wherein the hollow spray mold has an H-shaped hollow area, and the area of ​​the H-shaped hollow area is 1.5 times the area of ​​the predetermined H-shaped pattern. Spray 3 presses (1L kettle, each press is about 0.5mL) of water-based polyurethane treatment agent at a distance of 10 cm from the hollow spray mold, and bake at 150°C for 5 minutes before forming.

[0091] The viscosity of the waterborne polyurethane treatment agent is 200-300 cps, and the waterborne polyurethane treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 100 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0092] Comparative Example 1

[0093] This embodiment provides a laser-engraved polyurethane synthetic leather for automobile interior decoration, which includes, from the outside to the inside, a surface treatment layer, a first surface layer, a second surface layer, a foaming layer, and a base fabric layer. The specific preparation method thereof is as follows:

[0094] S1. Apply the polyurethane slurry of the surface layer 1 to the surface of the release paper, heat and dry it at 130°C to obtain the surface layer 1.

[0095] The surface layer polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LY-90NPC resin, 2 parts of UV absorber UV234, 2 parts of wear-resistant additive DC-57, 0.3 parts of leveling agent BYK-333, 10 parts of color paste PU white 2A18, and 5 parts of color paste PU black 1A71.

[0096] S2. Apply the second surface layer polyurethane slurry to the first surface layer, heat and dry at 130°C to obtain the second surface layer.

[0097] The second polyurethane slurry of the surface layer is prepared from the following components in parts by weight: 120 parts of LT-50 resin, 1 part of wear-resistant additive DC-57, 0.3 parts of leveling agent BYK-333, 10 parts of color paste PU white 2A18, and 5 parts of color paste PU black 1A71.

[0098] S3. Apply the foaming layer polyurethane slurry to the second surface of the surface layer, then place it at 90°C for 1 minute to form a semi-dry solvent-free layer and then stick a 150D plain cloth base fabric; bake it in an oven at 100°C for 5 minutes, roll it up, and peel off the release paper to obtain a synthetic leather semi-finished product.

[0099] The polyurethane slurry of the foaming layer is a thermosetting two-component solvent-free foaming polyurethane, and the thermosetting two-component solvent-free foaming polyurethane resin is mixed with polyether type combination A material and AL-5040B prepolymer in a weight ratio of 100:80. The polyether type combination A material is prepared from the following components in weight: 100 parts of AL-3051A, 80 parts of aluminum hydroxide, 0.04 parts of catalyst SJDT-12, and 0.5 parts of water.

[0100] S4. A surface treatment agent is applied to the surface layer of the semi-finished polyurethane synthetic leather, and the leather is baked at 150° C. for 5 minutes. The leather is laser engraved to form a predetermined H-shaped pattern, thereby obtaining a laser engraved polyurethane synthetic leather.

[0101] The waterborne polyurethane surface treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 50 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0102] Comparative Example 2

[0103] This embodiment provides a laser-engraved polyurethane synthetic leather for automotive interior decoration, which includes a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer, and a base fabric layer from the outside to the inside. The specific preparation method is as follows:

[0104] S1. Apply the surface polyurethane slurry to the surface of the release paper, heat and dry at 130°C to obtain the surface layer.

[0105] The surface polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LY-90NPC resin, 2 parts of ultraviolet absorber UV234, 2 parts of wear-resistant additive DC-57, 0.3 parts of leveling agent BYK-333, 10 parts of color paste PU white 2A18, and 5 parts of color paste PU black 1A71.

[0106] S2. Apply the transparent barrier layer polyurethane slurry to the surface layer, heat and dry it at 130° C. to obtain a transparent barrier layer.

[0107] The transparent barrier layer polyurethane slurry is prepared from the following components in parts by weight: 120 parts of LT-50 resin, 1 part of wear-resistant additive DC-57, and 0.3 parts of leveling agent BYK-333.

[0108] S3. Apply the foaming layer polyurethane slurry on the surface of the transparent barrier layer, and then bake it at 90°C for 1 minute to form a semi-dry solvent-free layer, and then stick a 150D plain cloth base fabric; bake it in an oven at 100°C for 5 minutes, roll it up, and peel off the release paper to obtain a synthetic leather semi-finished product.

[0109] The polyurethane slurry of the foaming layer is a thermosetting two-component solvent-free foaming polyurethane, and the thermosetting two-component solvent-free foaming polyurethane resin is mixed with polyether type combination A material and AL-5040B prepolymer in a weight ratio of 100:80. The polyether type combination A material is prepared from the following components in weight: 100 parts of AL-3051A, 80 parts of aluminum hydroxide, 0.04 parts of catalyst SJDT-12, and 0.5 parts of water.

[0110] S4. A surface treatment agent is applied to the surface layer of the semi-finished polyurethane synthetic leather, and the leather is baked at 150° C. for 4 minutes. The leather is laser engraved to form a predetermined H-shaped pattern, thereby obtaining a laser engraved polyurethane synthetic leather.

[0111] The waterborne polyurethane surface treatment agent is prepared from the following components in parts by weight: 100 parts of KTT728 resin, 50 parts of water, 4 parts of blocked isocyanate crosslinking agent HI100, 0.3 parts of leveling agent BYK-333, and 0.3 parts of defoaming agent BYK-024.

[0112] Test Case

[0113] The laser engraved polyurethane synthetic leather obtained in the above examples and comparative examples was subjected to performance tests. The performance test method is as follows:

[0114] Batch color difference after laser engraving: According to the spectrophotometer method, use standard light source (D65) to measure the L, a, and b values ​​of the controlled color plate and the sample provided by the customer, and calculate the △E value.

[0115] Hydrolysis resistance: Test according to Method B of QB / T4671-2014. 10% NaOH, room temperature, test for 24 hours. After the test, observe whether the leather surface is cracked or powdered.

[0116] Wear resistance: QB / T2726-2005 Physical and mechanical tests of leather - Determination of wear resistance

[0117] Folding resistance: Perform according to QB / T2714-2018 regulations, test 100,000 times, and observe whether there are cracks on the leather surface after the test.

[0118] The test results are shown in Table 1.

[0119] Table 1 Performance test results

[0120]

[0121]

[0122] From the results in Table 1, it can be seen that the color difference of the batches after laser engraving of Examples 1-3 is less than 0.3, while the color difference of the batches after laser engraving of Comparative Example 1 without a transparent barrier layer is 0.84, which is significantly higher than that of Examples 1-3. Therefore, by providing a transparent barrier layer on the foaming layer, the embodiment of the present application can effectively block the migration of color during the high-temperature oxidation process generated by laser laser engraving, thereby ensuring that the foaming layer will not be contaminated by color, and ensuring the color stability of different batches of products after laser laser engraving. From the analysis of the hydrolysis resistance, wear resistance, and folding resistance of Examples 1-3 and Comparative Example 1-2, the performance of Examples 1-3 is qualified; but the hydrolysis resistance, wear resistance, and folding resistance of Comparative Example 1-2 are all unqualified, so the embodiment of the present application can effectively increase the durability of the product by adding a spraying process after laser engraving.

[0123] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A laser engraved polyurethane synthetic leather for automobile interior, on which a predetermined pattern is formed by laser engraving process, characterized in that: It includes a surface treatment layer, a surface layer, a transparent barrier layer, a foaming layer and a base fabric layer from the outside to the inside.

2. The laser engraved polyurethane synthetic leather for automotive interior decoration according to claim 1, characterized in that: The transparent barrier layer is prepared from a transparent barrier layer polyurethane colorless slurry, and the transparent barrier layer polyurethane colorless slurry is prepared from the following components in parts by weight: 100-150 parts of transparent barrier layer polyurethane resin, 1-2 parts of wear-resistant additive, and 0.1-0.5 parts of leveling agent; And / or, the polyurethane resin of the transparent barrier layer is at least one of polyether polyurethane, polyester polyurethane and polycarbonate polyurethane.

3. The laser engraved polyurethane synthetic leather for automotive interior decoration according to claim 1, characterized in that: The surface treatment layer is prepared from a waterborne polyurethane surface treatment agent, and the waterborne polyurethane surface treatment agent is prepared from the following components in parts by weight: 100-120 parts of a waterborne polyurethane resin, 30-80 parts of water, 3-5 parts of a blocked isocyanate crosslinking agent, 0.1-0.5 parts of a leveling agent, and 0.1-0.5 parts of a defoaming agent.

4. The laser engraved polyurethane synthetic leather for automotive interior decoration according to claim 1, characterized in that: The surface layer is prepared from surface layer polyurethane slurry, and the surface layer polyurethane slurry is prepared from the following components in parts by weight: 100-150 parts of surface layer polyurethane resin, 1-2 parts of ultraviolet absorber, 1-2 parts of wear-resistant additive, 0.1-0.5 parts of leveling agent, and 15-20 parts of color paste.

5. The laser engraved polyurethane synthetic leather for automobile interior decoration according to claim 4, characterized in that: The surface layer polyurethane resin is at least one of polyether polyurethane, polyester polyurethane and polycarbonate polyurethane.

6. The laser engraved polyurethane synthetic leather for automobile interior decoration according to claim 1, characterized in that: The foaming layer is prepared from a foaming layer polyurethane slurry, and the foaming layer polyurethane slurry adopts a thermosetting two-component solvent-free foaming polyurethane resin. The thermosetting two-component solvent-free foaming polyurethane resin is mixed with a polyether type combination A material and a polyether polycarbon mixed type B material prepolymer according to a weight ratio of 100:70-80; the polyether type combination A material is prepared from the following components in weight parts: 100-120 parts of polyether type combination A material, 80-100 parts of aluminum hydroxide, 0.03-0.05 parts of a catalyst, and 0.3-0.5 parts of water.

7. A method for preparing the laser engraved polyurethane synthetic leather for automotive interior decoration according to any one of claims 1 to 6, characterized in that: It includes the following steps: S1. Applying the surface polyurethane slurry to the surface of the release paper and drying the surface layer; S2. The transparent barrier layer polyurethane colorless slurry is applied to the surface layer and dried to obtain a transparent barrier layer; S3. The polyurethane foaming layer is coated on the transparent barrier layer, dried to semi-dry, and a semi-dry solvent-free layer is formed, and then the cloth is pasted, and the roll is rolled after drying, and the release paper is peeled off to obtain a semi-finished synthetic leather; S4. Applying a water-based polyurethane surface treatment agent on the surface layer of the semi-finished synthetic leather, and then drying and laser engraving it to form a predetermined pattern, thereby obtaining a laser engraved automotive interior polyurethane synthetic leather.

8. The method for preparing laser engraved polyurethane synthetic leather for automobile interior decoration according to claim 7, characterized in that: It also includes the following steps: S5. Spraying a water-based polyurethane treatment agent on the predetermined area including the predetermined pattern and drying it.

9. The method for preparing laser engraved polyurethane synthetic leather for automobile interior decoration according to claim 8, characterized in that: The viscosity of the waterborne polyurethane treatment agent is 200-300 cps, and the waterborne polyurethane treatment agent is prepared from the following components in parts by weight: 100-120 parts of waterborne polyurethane resin, 100-150 parts of water, 3-5 parts of blocked isocyanate crosslinking agent, 0.1-0.5 parts of leveling agent, and 0.1-0.5 parts of defoaming agent; And / or, the spraying of the water-based polyurethane surface treatment agent on the predetermined area including the predetermined pattern is to place a hollow spraying mold on the laser-engraved automotive interior polyurethane synthetic leather, make the hollow area of ​​the hollow spraying mold correspond to the predetermined pattern and the area of ​​the hollow area is 1.2-1.5 times the area of ​​the predetermined pattern, and spray the water-based polyurethane treatment agent into the predetermined area at a distance of 10-15 cm from the predetermined pattern; And / or, in step S5, the drying temperature is 150-170° C. and the drying time is 4-5 min.

10. The method for preparing laser engraved polyurethane synthetic leather for automobile interior decoration according to claim 7, characterized in that: In step S1, the drying temperature is 130-150°C; And / or, in step S2, the drying temperature is 130-150°C; And / or, in step S3, the temperature of baking to semi-dryness is 70-90°C and the time is 1-1.5 min; the temperature of drying is 100-120°C and the time is 4-5 min; And / or, in step S4, the drying temperature is 150-170° C. and the drying time is 4-5 min.

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