A thin polyurethane composite for consumer electronics and a method of making the same

Abstract

This invention relates to a thin polyurethane composite material for consumer electronics and its preparation method. The thin polyurethane composite material for consumer electronics comprises, from the outside in, a waterborne polyurethane top layer, a waterborne polyurethane intermediate layer, a waterborne polyurethane adhesive layer, and a base fabric layer. The base fabric layer is made of fiberglass cloth, and the side of the fiberglass cloth facing the waterborne polyurethane adhesive layer is coated with an adhesion promoter emulsion. This invention innovatively applies fiberglass cloth to the field of polyurethane synthetic leather manufacturing, which not only reduces the weight of polyurethane synthetic leather but also improves its strength and toughness. The resulting thin polyurethane composite material has advantages such as thinness, light weight, high strength, and good durability, better meeting the development requirements of thinning, lightening, and strengthening in consumer electronics decorative materials.

Description

Technical Field

[0001] This invention relates to the field of polyurethane composite materials technology, and in particular to a thin polyurethane composite material for consumer electronics and its preparation method. Background Technology

[0002] There are various choices for decorative materials used in consumer electronics, such as plastic, metal, glass, ceramic, and genuine leather. Each material has its own characteristics. For example, plastic is considered low-end; metal can affect signal strength; glass is easily broken; and genuine leather offers a good feel and high-end look, but suffers from poor wear resistance and durability. In recent years, polyurethane, a consumer electronics decorative material that closely resembles genuine leather in feel and quality, has become increasingly popular. This material offers a full and delicate feel, a high-end look, is shatterproof, and resistant to aging. It solves the problems of poor wear resistance, easy breakage during use, and short lifespan associated with genuine leather, making it a favorite among consumer electronics manufacturers.

[0003] With social development, consumers have increasingly higher requirements for product quality. Traditional consumer electronics decorative materials are thick and generally lack strength and durability, which can no longer meet the high requirements of high-end consumer electronics products such as thinness, lightness, and durability. Therefore, a thin, light, high-strength, and durable composite material has become a new demand direction. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a thin polyurethane composite material for consumer electronics and its preparation method. The base fabric layer of this thin polyurethane composite material for consumer electronics is made of glass fiber cloth treated with an adhesion promoter emulsion. This not only reduces the weight of polyurethane synthetic leather but also improves its strength and toughness. The resulting thin polyurethane composite material has advantages such as thinness, light weight, high strength, and good durability, which better meets the development requirements of thinning, lightening, and strengthening of decorative materials for consumer electronics.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The present invention provides a thin polyurethane composite material for consumer electronics, which comprises, from the outside to the inside, a waterborne polyurethane top layer, a waterborne polyurethane intermediate layer, a waterborne polyurethane adhesive layer, and a base fabric layer. The base fabric layer is made of fiberglass cloth, and an adhesion promoter emulsion coating is formed on the side of the fiberglass cloth facing the waterborne polyurethane adhesive layer.

[0007] As a further improvement to the above-mentioned solution of the present invention, the thickness of the fiberglass cloth is 0.08-0.1mm.

[0008] As a further improvement of the above-mentioned solution of the present invention, the waterborne polyurethane surface layer is made of waterborne silicone-based polyurethane slurry, which is prepared from the following components in parts by weight: 100 parts waterborne silicone-based polyurethane slurry, 2-5 parts waterborne curing agent, 0.5-2 parts waterborne leveling agent, 0.1-0.5 parts defoamer, 0.5-2 parts waterborne thickener, and 5-20 parts waterborne color paste.

[0009] As a further improvement of the above-mentioned solution of the present invention, the waterborne polyurethane intermediate layer is made of waterborne polycarbonate polyurethane slurry, which is prepared from the following components in parts by weight: 100 parts waterborne polycarbonate polyurethane slurry, 2-5 parts waterborne curing agent, 0.5-2 parts waterborne leveling agent, 0.1-0.5 parts defoamer, 0.5-2 parts waterborne thickener, and 5-20 parts waterborne color paste.

[0010] As a further improvement to the above-mentioned solution of the present invention, the waterborne polyurethane adhesive layer is made of waterborne two-component polyether polyurethane slurry, which is prepared from the following components in parts by weight: 100 parts waterborne two-component polyether polyurethane slurry, 5-10 parts waterborne sealing and curing agent, 0.5-1 part waterborne leveling agent, 0.1-0.4 parts defoamer, 0.5-2 parts waterborne thickener, and 5-10 parts waterborne color paste.

[0011] This invention provides a method for preparing the thin polyurethane composite material for consumer electronics as described above, comprising the following steps:

[0012] S1. Coat the surface of the fiberglass cloth with an adhesion promoter emulsion and dry it to obtain the base cloth layer;

[0013] S2. Coat a layer of water-based polyurethane surface layer slurry onto the release paper and dry it to obtain a water-based polyurethane surface layer;

[0014] S3. Coat a layer of water-based polyurethane intermediate layer slurry onto the water-based polyurethane surface layer, and dry it to obtain the water-based polyurethane intermediate layer.

[0015] S4. Coat a layer of waterborne polyurethane adhesive slurry on the waterborne polyurethane intermediate layer, dry it completely to obtain a waterborne polyurethane adhesive layer, bond the waterborne polyurethane adhesive layer to the base fabric layer, dry and cure it, then roll it up and cure it in a curing chamber at 60°C for 12-72 hours. Peel off the release paper to obtain a thin polyurethane composite material for consumer electronics.

[0016] As a further improvement to the above-described solution of the present invention, in step S1, the coating amount of the adhesion promoter emulsion, based on wet weight, is 20-30 g / cm³. 2 The drying temperature is 100-130℃ and the vehicle speed is 6-10m / min.

[0017] As a further improvement to the above-mentioned solution of the present invention, in step S2, the coating thickness of the water-based polyurethane surface slurry is 0.1-0.15 mm, and the drying temperature is 90-140℃ and the machine speed is 6-10 m / min.

[0018] As a further improvement to the above-mentioned solution of the present invention, in step S3, the coating thickness of the waterborne polyurethane intermediate layer slurry is 0.15-0.20 mm, and the drying temperature is 90-140℃ and the machine speed is 6-10 m / min.

[0019] As a further improvement to the above-mentioned solution of the present invention, in step S4, the coating thickness of the water-based polyurethane adhesive layer slurry is 0.2-0.25 mm, the drying temperature is 80-110℃, the drying and curing temperature is 140-160℃, and the vehicle speed is 6-10 m / min.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This invention innovatively applies fiberglass cloth to the manufacturing of polyurethane synthetic leather. Since fiberglass cloth is an inorganic material, it is difficult to react and bond with polyurethane. Therefore, fiberglass cloth is used as the base layer, and an adhesion promoter emulsion is treated on the surface of the fiberglass cloth. After hydrolysis, the silanol molecules generated associate and aggregate to form a network structure covering the surface of the fiberglass cloth, realizing the organicification of the inorganic fiberglass cloth. This achieves the reaction and bonding between the fiberglass cloth and polyurethane, which not only reduces the weight of polyurethane synthetic leather but also improves its strength and toughness. The resulting thin polyurethane composite material has the advantages of thinness, light weight, high strength, and good durability, which better meets the development requirements of thinning, lightening, and strengthening of decorative materials for consumer electronics, providing a new option for decorative materials for consumer electronics such as mobile phones and tablets.

[0022] 2. This invention uses fiberglass cloth with a thickness of 0.08-0.1 mm to produce a fiberglass polyurethane composite material with a thickness of 0.2-0.22 mm and a basis weight of 180-250 g / m². 2 Its tensile strength is greater than 400 N / 3 cm, while traditional consumer electronics composite materials are all over 0.25 mm thick and have a basis weight of over 300 g / m³. 2 The tensile strength can only be guaranteed to be greater than 100 N / 3 cm. In comparison, the polyurethane composite material prepared by this invention is thinner, lighter, and stronger, which better meets the development requirements of thinning, lightening, and strengthening of consumer electronics decorative materials.

[0023] 3. This discovery innovatively uses water-based silicone polyurethane material as the surface layer, which is skin-friendly, stain-resistant and wear-resistant, eliminating the need for additional anti-fouling treatment processes, thus reducing material costs and energy consumption.

[0024] 4. All materials used in this invention are water-based and environmentally friendly, making them more environmentally friendly.

[0025] 5. The thin polyurethane composite material prepared by this invention is more suitable for the increasingly thinner and more durable use requirements of various high-end consumer electronics products compared with traditional consumer electronics decorative materials. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0028] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0029] Fiberglass cloth: Electronic fiberglass cloth produced by Taishan Fiberglass Co., Ltd.

[0030] Adhesion promoter emulsion: Dow Corning Z-6011;

[0031] Waterborne polycarbonate polyurethane slurry: Stahl WF-73-575;

[0032] Waterborne silicone polyurethane slurry: Slock 1089R7;

[0033] Waterborne two-component polyether polyurethane slurry: Anke Chemical 3355;

[0034] Water-based thickener: Wanhua Chemical U-506;

[0035] Defoamer: Starr 2459;

[0036] Water-based curing agent: SF-150, manufactured by Zhejiang Shunfa Chemical Additives Co., Ltd.

[0037] Water-based leveling agent: Stahl LA-91-120;

[0038] Water-based color paste: Water-based color paste produced by Zhejiang Shenlan New Materials Co., Ltd.;

[0039] Water-based sealing and curing agent: Starr XR-22-903.

[0040] The above-mentioned raw materials are only for illustrating the source and composition of the reagents used in the experiments of this invention, so as to fully disclose them, and do not imply that the invention cannot be achieved by using other similar reagents or reagents provided by other suppliers.

[0041] Example 1

[0042] This embodiment presents a thin polyurethane composite material for consumer electronics, which is prepared using the following steps:

[0043] S1. Apply a layer of adhesion promoter emulsion to the surface of a 0.08mm thick fiberglass cloth using a roller coating method. The coating amount of the adhesion promoter emulsion is 20g / m² (wet weight). 2 Then, it is dried in an oven under the following conditions: temperature 100℃ and speed 10m / min, to obtain a semi-finished base fabric.

[0044] S2. Coat a layer of water-based silicone polyurethane slurry with a thickness of 0.1 mm on the release paper and dry it in an oven under the following conditions: temperature 90℃ and speed 10m / min to obtain a water-based polyurethane surface layer.

[0045] The waterborne silicone polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne silicone polyurethane 1089R7, 2 parts waterborne curing agent SF-150, 0.5 parts waterborne leveling agent LA-91-120, 0.1 parts defoamer 2459, 0.6 parts waterborne thickener U-506, and 20 parts waterborne color paste.

[0046] S3. A layer of waterborne polycarbonate polyurethane slurry with a thickness of 0.15 mm is coated on the waterborne polyurethane surface layer and dried in an oven to obtain a waterborne polyurethane intermediate layer. The drying conditions are: temperature 90℃ and speed 10m / min.

[0047] The waterborne polycarbonate polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne polycarbonate polyurethane WF-73-575, 2 parts waterborne curing agent SF-150, 0.5 parts waterborne leveling agent LA-91-120, 0.1 parts defoamer 2459, 0.6 parts waterborne thickener U-506, and 20 parts waterborne color paste.

[0048] S4. Coat the surface of the waterborne polyurethane intermediate layer with a layer of waterborne two-component polyether polyurethane slurry with a thickness of 0.2 mm. After complete drying in an oven at 110℃, bond it with the base fabric semi-finished product obtained in step S1. Continue to dry and cure in an oven under the following conditions: temperature 140℃ and speed 10m / min. Then, without peeling off the release paper, roll it directly and place it in a curing chamber at 60℃ for 12 hours. After curing, peel off the release paper to obtain the finished thin polyurethane composite material for consumer electronics.

[0049] The waterborne two-component polyether polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne two-component polyether polyurethane 3355, 5 parts waterborne blocking curing agent XR-22-903, 0.5 parts waterborne leveling agent LA-91-120, 0.1 parts defoamer 2459, 0.6 parts waterborne thickener U-506, and 10 parts waterborne color paste.

[0050] The thin polyurethane composite material for consumer electronics prepared in this embodiment has a thickness of 0.2 mm (referencing standard: GB / T8949-2008) and a basis weight of 180-190 g / m³. 2 (Reference standard: ASTM D751); Peel strength ≥40N / 3CM (Reference standard: GB / T8949-2008); Tensile strength ≥400N / 3CM (Reference standard: GB / T 8949-2008); Abrasion resistance: 1Kg of wet wool felt can withstand 5000 cycles without breaking; No fogging after 5 weeks of constant temperature and humidity testing at 70℃ and 95%RH; No powdering (Reference standard: QB / T 4671-2014).

[0051] Example 2

[0052] This embodiment presents a thin polyurethane composite material for consumer electronics, which is prepared using the following steps:

[0053] S1. Apply a layer of adhesion promoter emulsion to the surface of a 0.083mm thick fiberglass cloth using a roller coating method. The coating amount of the adhesion promoter emulsion is 22g / m² (wet weight). 2 Then, it is dried in an oven under the following conditions: temperature 110℃ and speed 9m / min, to obtain a semi-finished base fabric.

[0054] S2. Coat a layer of water-based silicone polyurethane slurry with a thickness of 0.11 mm on the release paper and dry it in an oven under the following conditions: temperature 100℃ and speed 9m / min to obtain a water-based polyurethane surface layer.

[0055] The waterborne silicone polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne silicone polyurethane 1089R7, 2.5 parts waterborne curing agent SF-150, 0.8 parts waterborne leveling agent LA-91-120, 0.2 parts defoamer 2459, 0.5 parts waterborne thickener U-506, and 16 parts waterborne color paste.

[0056] S3. A layer of waterborne polycarbonate polyurethane slurry with a thickness of 0.16 mm is coated on the waterborne polyurethane surface layer, and the waterborne polyurethane intermediate layer is obtained after drying in an oven. The drying conditions are: temperature 100℃ and speed 9m / min.

[0057] The waterborne polycarbonate polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne polycarbonate polyurethane WF-73-575, 2.5 parts waterborne curing agent SF-150, 0.8 parts waterborne leveling agent LA-91-120, 0.2 parts defoamer 2459, 0.5 parts waterborne thickener U-506, and 16 parts waterborne color paste.

[0058] S4. Coat the surface of the waterborne polyurethane intermediate layer with a layer of waterborne two-component polyether polyurethane slurry with a thickness of 0.21 mm. After complete drying in an oven at 105℃, bond it with the base fabric semi-finished product obtained in step S1. Continue to dry and cure in an oven under the following conditions: temperature 145℃ and speed 9m / min. Then, without peeling off the release paper, roll it directly and place it in a curing chamber at 60℃ for 24 hours. After curing, peel off the release paper to obtain the finished thin polyurethane composite material for consumer electronics.

[0059] The waterborne two-component polyether polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne two-component polyether polyurethane 3355, 6 parts waterborne blocking curing agent XR-22-903, 0.6 parts waterborne leveling agent LA-91-120, 0.15 parts defoamer 2459, 0.5 parts waterborne thickener U-506, and 9 parts waterborne color paste.

[0060] The thin polyurethane composite material for consumer electronics prepared in this embodiment has a thickness of 0.21 mm (referencing standard: GB / T8949-2008) and a basis weight of 190-200 g / m³. 2 (Reference standard: ASTM D751); Peel strength ≥45N / 3CM (Reference standard: GB / T8949-2008); Tensile strength ≥450N / 3CM (Reference standard: GB / T 8949-2008); Abrasion resistance: 1Kg of wet wool felt can withstand 5500 cycles without breaking; No fogging after 6 weeks of constant temperature and humidity testing at 70℃ and 95%RH; No powdering (Reference standard: QB / T 4671-2014).

[0061] Example 3

[0062] This embodiment presents a thin polyurethane composite material for consumer electronics, which is prepared using the following steps:

[0063] S1. Apply a layer of adhesion promoter emulsion to the surface of a 0.085mm thick fiberglass cloth using a roller coating method. The coating amount of the adhesion promoter emulsion is 24g / m² (wet weight). 2 Then, it is dried in an oven under the following conditions: temperature 115℃ and speed 8m / min, to obtain a semi-finished base fabric.

[0064] S2. Coat a layer of water-based silicone polyurethane slurry with a thickness of 0.12 mm on the release paper and dry it in an oven under the following conditions: temperature 110℃ and speed 8m / min to obtain a water-based polyurethane surface layer.

[0065] The waterborne silicone polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne silicone polyurethane 1089R7, 3 parts waterborne curing agent SF-150, 1.2 parts waterborne leveling agent LA-91-120, 0.3 parts defoamer 2459, 0.8 parts waterborne thickener U-506, and 14 parts waterborne color paste.

[0066] S3. A layer of waterborne polycarbonate polyurethane slurry with a thickness of 0.17 mm is coated on the waterborne polyurethane surface layer and dried in an oven to obtain a waterborne polyurethane intermediate layer. The drying conditions are: temperature 110℃ and speed 8m / min.

[0067] The waterborne polycarbonate polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne polycarbonate polyurethane WF-73-575, 3 parts waterborne curing agent SF-150, 1.2 parts waterborne leveling agent LA-91-120, 0.3 parts defoamer 2459, 0.8 parts waterborne thickener U-506, and 14 parts waterborne color paste.

[0068] S4. Coat the surface of the waterborne polyurethane intermediate layer with a layer of waterborne two-component polyether polyurethane slurry with a thickness of 0.22 mm. After complete drying in an oven at 100℃, bond it with the base fabric semi-finished product obtained in step S1. Continue to dry and cure in an oven under the following conditions: temperature 150℃ and speed 8m / min. Then, without peeling off the release paper, roll it directly and place it in a curing chamber at 60℃ for 36 hours. After curing, peel off the release paper to obtain the finished thin polyurethane composite material for consumer electronics.

[0069] The waterborne two-component polyether polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne two-component polyether polyurethane 3355, 7 parts waterborne blocking curing agent XR-22-903, 0.7 parts waterborne leveling agent LA-91-120, 0.2 parts defoamer 2459, 0.8 parts waterborne thickener U-506, and 8 parts waterborne color paste.

[0070] The thin polyurethane composite material for consumer electronics prepared in this embodiment has a thickness of 0.22 mm (referencing standard: GB / T8949-2008) and a basis weight of 200-210 g / m³. 2(Reference standard: ASTM D751); Peel strength ≥50N / 3CM (Reference standard: GB / T8949-2008); Tensile strength ≥480N / 3CM (Reference standard: GB / T 8949-2008); Abrasion resistance: 1Kg of wet wool felt can withstand 6000 cycles without breaking; No fogging after 7 weeks of constant temperature and humidity testing at 70℃ and 95%RH; No powdering (Reference standard: QB / T 4671-2014).

[0071] Example 4

[0072] This embodiment presents a thin polyurethane composite material for consumer electronics, which is prepared using the following steps:

[0073] S1. Apply a layer of adhesion promoter emulsion to the surface of a 0.09mm thick fiberglass cloth using a roller coating method. The coating amount of the adhesion promoter emulsion is 26g / m² (wet weight). 2 Then, it is dried in an oven under the following conditions: temperature 120℃, speed 7m / min, to obtain a semi-finished base fabric.

[0074] S2. Coat a layer of water-based silicone polyurethane slurry with a thickness of 0.13 mm on the release paper and dry it in an oven under the following conditions: temperature 120℃ and speed 7m / min to obtain a water-based polyurethane surface layer.

[0075] The waterborne silicone polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne silicone polyurethane 1089R7, 3.5 parts waterborne curing agent SF-150, 1.5 parts waterborne leveling agent LA-91-120, 0.4 parts defoamer 2459, 1 part waterborne thickener U-506, and 12 parts waterborne color paste.

[0076] S3. A layer of waterborne polycarbonate polyurethane slurry with a thickness of 0.18 mm is coated on the waterborne polyurethane surface layer, and the waterborne polyurethane intermediate layer is obtained after drying in an oven. The drying conditions are: temperature 120℃ and speed 7m / min.

[0077] The waterborne polycarbonate polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne polycarbonate polyurethane WF-73-575, 3.5 parts waterborne curing agent SF-150, 1.5 parts waterborne leveling agent LA-91-120, 0.4 parts defoamer 2459, 1 part waterborne thickener U-506, and 12 parts waterborne color paste.

[0078] S4. Coat the surface of the waterborne polyurethane intermediate layer with a layer of waterborne two-component polyether polyurethane slurry with a thickness of 0.23 mm. After completely drying in an oven at 95℃, bond it with the base fabric semi-finished product obtained in step S1. Continue to dry and cure in an oven under the following conditions: temperature 153℃ and speed 8m / min. Then, without peeling off the release paper, roll it directly and place it in a curing chamber at 60℃ for 48 hours. After curing, peel off the release paper to obtain the finished thin polyurethane composite material for consumer electronics.

[0079] The waterborne two-component polyether polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne two-component polyether polyurethane 3355, 8 parts waterborne blocking curing agent XR-22-903, 0.8 parts waterborne leveling agent LA-91-120, 0.25 parts defoamer 2459, 1 part waterborne thickener U-506, and 7 parts waterborne color paste.

[0080] The thin polyurethane composite material for consumer electronics prepared in this embodiment has a thickness of 0.235 mm (referencing standard: GB / T 8949-2008) and a basis weight of 210-220 g / m³. 2 (Reference standard: ASTM D751); Peel strength ≥55N / 3CM (Reference standard: GB / T 8949-2008); Tensile strength ≥500N / 3CM (Reference standard: GB / T 8949-2008); Abrasion resistance: 1Kg of wet wool felt can withstand 4000 cycles without breaking; No fogging after 8 weeks of constant temperature and humidity testing at 70℃ and 95%RH; No powdering (Reference standard: QB / T 4671-2014).

[0081] Example 5

[0082] This embodiment presents a thin polyurethane composite material for consumer electronics, which is prepared using the following steps:

[0083] S1. Apply a layer of adhesion promoter emulsion to the surface of a 0.095mm thick fiberglass cloth using a roller coating method. The coating amount of the adhesion promoter emulsion is 28g / m² (wet weight). 2 Then, it is dried in an oven under the following conditions: temperature 125℃ and speed 6.5m / min, to obtain a semi-finished base fabric.

[0084] S2. Coat a layer of water-based silicone polyurethane slurry with a thickness of 0.14 mm on the release paper, and dry it in an oven under the following conditions: temperature 130℃ and machine speed 6.5 m / min, to obtain a water-based polyurethane surface layer.

[0085] The waterborne silicone polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne silicone polyurethane 1089R7, 4 parts waterborne curing agent SF-150, 1.8 parts waterborne leveling agent LA-91-120, 0.45 parts defoamer 2459, 1.2 parts waterborne thickener U-506, and 10 parts waterborne color paste.

[0086] S3. A layer of waterborne polycarbonate polyurethane slurry with a thickness of 0.19 mm is coated on the waterborne polyurethane surface layer, and the waterborne polyurethane intermediate layer is obtained after drying in an oven. The drying conditions are: temperature 130℃ and machine speed 6.5m / min.

[0087] The waterborne polycarbonate polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne polycarbonate polyurethane WF-73-575, 4 parts waterborne curing agent SF-150, 1.8 parts waterborne leveling agent LA-91-120, 0.5 parts defoamer 2459, 1.2 parts waterborne thickener U-506, and 10 parts waterborne color paste.

[0088] S4. Coat the surface of the waterborne polyurethane intermediate layer with a layer of waterborne two-component polyether polyurethane slurry with a thickness of 0.24 mm. After complete drying in an oven at 90℃, bond it with the base fabric semi-finished product obtained in step S1. Continue to dry and cure in an oven under the following conditions: temperature 157℃ and speed 6.5 m / min. Then, without peeling off the release paper, roll it directly and place it in a curing chamber at 60℃ for 60 hours. After curing, peel off the release paper to obtain the finished thin polyurethane composite material for consumer electronics.

[0089] The waterborne two-component polyether polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne two-component polyether polyurethane 3355, 9 parts waterborne blocking curing agent XR-22-903, 0.9 parts waterborne leveling agent LA-91-120, 0.3 parts defoamer 2459, 1.2 parts waterborne thickener U-506, and 6 parts waterborne color paste.

[0090] The thin polyurethane composite material for consumer electronics prepared in this embodiment has a thickness of 0.245 mm (referencing standard: GB / T 8949-2008); and a basis weight of 210-225 g / m³. 2 (Reference standard: ASTM D751); Peel strength ≥60N / 3CM (Reference standard: GB / T8949-2008); Tensile strength ≥530N / 3CM (Reference standard: GB / T 8949-2008); Abrasion resistance: 1Kg of wet wool felt can withstand 7000 cycles without breaking; No fogging after 9 weeks of constant temperature and humidity testing at 70℃ and 95%RH; No powdering (Reference standard: QB / T 4671-2014).

[0091] Example 6

[0092] This embodiment presents a thin polyurethane composite material for consumer electronics, which is prepared using the following steps:

[0093] S1. Apply a layer of adhesion promoter emulsion to the surface of a 0.1 mm thick fiberglass cloth using a roller coating method. The coating amount of the adhesion promoter emulsion is 30 g / m² (wet weight). 2 Then, it is dried in an oven under the following conditions: temperature 130℃ and speed 6m / min, to obtain a semi-finished base fabric.

[0094] S2. Coat a layer of water-based silicone polyurethane slurry with a thickness of 0.15 mm on the release paper and dry it in an oven under the following conditions: temperature 140℃ and speed 6m / min to obtain a water-based polyurethane surface layer.

[0095] The waterborne silicone polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne silicone polyurethane 1089R7, 5 parts waterborne curing agent SF-150, 2 parts waterborne leveling agent LA-91-120, 0.5 parts defoamer 2459, 2 parts waterborne thickener U-506, and 5 parts waterborne color paste.

[0096] S3. A layer of waterborne polycarbonate polyurethane slurry with a thickness of 0.2 mm is coated on the waterborne polyurethane surface layer and dried in an oven to obtain a waterborne polyurethane intermediate layer. The drying conditions are: temperature 140℃ and speed 6m / min.

[0097] The waterborne polycarbonate polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne polycarbonate polyurethane WF-73-575, 5 parts waterborne curing agent SF-150, 2 parts waterborne leveling agent LA-91-120, 0.5 parts defoamer 2459, 2 parts waterborne thickener U-506, and 5 parts waterborne color paste.

[0098] S4. Coat the surface of the waterborne polyurethane intermediate layer with a layer of waterborne two-component polyether polyurethane slurry with a thickness of 0.25 mm. After completely drying in an oven at 80℃, bond it with the base fabric semi-finished product obtained in step S1. Continue to dry and cure in an oven under the following conditions: temperature 160℃ and speed 6m / min. Then, without peeling off the release paper, roll it directly and place it in a curing chamber at 60℃ for 72 hours. After curing, peel off the release paper to obtain the finished thin polyurethane composite material for consumer electronics.

[0099] The waterborne two-component polyether polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne two-component polyether polyurethane 3355, 10 parts waterborne blocking curing agent XR-22-903, 1 part waterborne leveling agent LA-91-120, 0.4 parts defoamer 2459, 2 parts waterborne thickener U-506, and 5 parts waterborne color paste.

[0100] The thin polyurethane composite material for consumer electronics prepared in this embodiment has a thickness of 0.25 mm (referencing standard: GB / T8949-2008) and a basis weight of 225-250 g / m³. 2 (Reference standard: ASTM D751), Peel strength ≥70N / 3CM (Reference standard: GB / T8949-2008); Tensile strength ≥580N / 3CM (Reference standard: GB / T 8949-2008); Abrasion resistance: 1Kg of wet wool felt can withstand 8000 cycles without breaking; No fogging after 10 weeks of constant temperature and humidity testing at 70℃ and 95%RH; No powdering (Reference standard: QB / T 4671-2014).

[0101] Comparative Example

[0102] This embodiment presents a thin polyurethane composite material for consumer electronics, which is prepared using the following steps:

[0103] S1. Bake a 0.1mm thick fiberglass cloth in an oven under the following conditions: temperature 130℃ and speed 6m / min, to obtain a semi-finished base fabric.

[0104] S2. Coat a layer of water-based silicone polyurethane slurry with a thickness of 0.15 mm on the release paper and dry it in an oven under the following conditions: temperature 140℃ and speed 6m / min to obtain a water-based polyurethane surface layer.

[0105] The waterborne silicone polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne silicone polyurethane 1089R7, 5 parts waterborne curing agent SF-150, 2 parts waterborne leveling agent LA-91-120, 0.5 parts defoamer 2459, 2 parts waterborne thickener U-506, and 5 parts waterborne color paste.

[0106] S3. A layer of waterborne polycarbonate polyurethane slurry with a thickness of 0.2 mm is coated on the waterborne polyurethane surface layer and dried in an oven to obtain a waterborne polyurethane intermediate layer. The drying conditions are: temperature 140℃ and speed 6m / min.

[0107] The waterborne polycarbonate polyurethane slurry is prepared from the following raw materials in parts by weight: 100 parts waterborne polycarbonate polyurethane WF-73-575, 5 parts waterborne curing agent SF-150, 2 parts waterborne leveling agent LA-91-120, 0.5 parts defoamer 2459, 2 parts waterborne thickener U-506, and 5 parts waterborne color paste.

[0108] S4. Coat the surface of the waterborne polyurethane intermediate layer with a layer of waterborne two-component polyether polyurethane slurry with a thickness of 0.25 mm. After completely drying in an oven at 80℃, bond it with the base fabric semi-finished product obtained in step S1. Continue to dry and cure in an oven under the following conditions: temperature 160℃ and speed 6m / min. Then, without peeling off the release paper, roll it directly and place it in a curing chamber at 60℃ for 72 hours. After curing, peel off the release paper to obtain the finished thin polyurethane composite material for consumer electronics.

[0109] The waterborne two-component polyether polyurethane slurry is prepared from the following parts by weight of raw materials: 100 parts waterborne two-component polyether polyurethane 3355, 10 parts waterborne blocking curing agent XR-22-903, 1 part waterborne leveling agent LA-91-120, 0.4 parts defoamer 2459, 2 parts waterborne thickener U-506, and 5 parts waterborne color paste.

[0110] The thin polyurethane composite material for consumer electronics prepared in this embodiment has a thickness of 0.25 mm (referencing standard: GB / T8949-2008) and a basis weight of 205-230 g / m³. 2 (Reference standard: ASTM D751), peel strength ≥15N / 3CM (Reference standard: GB / T8949-2008); tensile strength ≥420N / 3CM (Reference standard: GB / T 8949-2008); abrasion resistance: wet wool felt *1Kg * 2000 cycles without breaking; no fogging after 3 weeks of constant temperature and humidity testing at 70℃ * 95%RH; no powdering (Reference standard: QB / T 4671-2014).

[0111] Based on the tests in Examples 1-6 above, increasing the thickness of the polyurethane coating, increasing the drying and curing time, increasing the amount of curing agent, and extending the curing time can improve the product's abrasion resistance, peel strength, tensile strength, and aging resistance. In the comparative example, without the adhesion promoter emulsion, the polyurethane does not bond firmly to the fiberglass cloth, significantly impacting the finished product's peel strength, abrasion resistance, tensile strength, and aging resistance. The test data shows that the product thickness in Examples 1-6 can be 0.2-0.25 mm, with a basis weight of 180-250 g / m². 2 The peel strength is at least 40N / 3CM, the tensile strength is at least 400N / 3CM, the wet wool felt can withstand more than 6000 abrasion tests under a 1Kg load without breaking, and it can withstand hydrolysis at 70℃*95%RH constant temperature and humidity for at least 5 weeks without fogging or powdering. Overall, the product of this invention is lightweight, durable, and its performance is far superior to ordinary consumer electronics decorative materials.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0113] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A thin polyurethane composite material for consumer electronics, comprising, from the outside to the inside, a waterborne polyurethane top layer, a waterborne polyurethane intermediate layer, a waterborne polyurethane adhesive layer, and a base fabric layer, characterized in that, The base fabric layer is made of fiberglass cloth, and the side of the fiberglass cloth facing the water-based polyurethane adhesive layer is coated with an adhesion promoter emulsion. The silanol molecules generated after the adhesion promoter emulsion is hydrolyzed associate and aggregate to form a network structure covering the surface of the fiberglass cloth, thereby realizing the organication of the fiberglass cloth. The thickness of the fiberglass cloth is 0.08-0.1 mm.

2. The thin polyurethane composite material for consumer electronics according to claim 1, characterized in that, The waterborne polyurethane surface layer is made of waterborne silicone-based polyurethane slurry, which is prepared from the following components in parts by weight: 100 parts waterborne silicone-based polyurethane slurry, 2-5 parts waterborne curing agent, 0.5-2 parts waterborne leveling agent, 0.1-0.5 parts defoamer, 0.5-2 parts waterborne thickener, and 5-20 parts waterborne color paste.

3. The thin polyurethane composite material for consumer electronics according to claim 1, characterized in that, The waterborne polyurethane intermediate layer is made of waterborne polycarbonate polyurethane slurry, which is prepared from the following components in parts by weight: 100 parts waterborne polycarbonate polyurethane slurry, 2-5 parts waterborne curing agent, 0.5-2 parts waterborne leveling agent, 0.1-0.5 parts defoamer, 0.5-2 parts waterborne thickener, and 5-20 parts waterborne color paste.

4. The thin polyurethane composite material for consumer electronics according to claim 1, characterized in that, The waterborne polyurethane adhesive layer is made of waterborne two-component polyether polyurethane slurry, which is prepared from the following components in parts by weight: 100 parts waterborne two-component polyether polyurethane slurry, 5-10 parts waterborne sealing and curing agent, 0.5-1 part waterborne leveling agent, 0.1-0.4 parts defoamer, 0.5-2 parts waterborne thickener, and 5-10 parts waterborne color paste.

5. A method for preparing a thin polyurethane composite material for consumer electronics as described in any one of claims 1-4, characterized in that, It includes the following steps: S1. Coat the surface of the fiberglass cloth with an adhesion promoter emulsion and dry it to obtain the base cloth layer; S2. Coat a layer of water-based polyurethane surface layer slurry onto the release paper and dry it to obtain a water-based polyurethane surface layer; S3. Coat a layer of water-based polyurethane intermediate layer slurry onto the water-based polyurethane surface layer, and dry it to obtain the water-based polyurethane intermediate layer. S4. Coat a layer of waterborne polyurethane adhesive slurry on the waterborne polyurethane intermediate layer, dry it completely to obtain a waterborne polyurethane adhesive layer, bond the waterborne polyurethane adhesive layer to the base fabric layer, dry and cure it, then roll it up and cure it in a curing chamber at 60°C for 12-72 hours. Peel off the release paper to obtain a thin polyurethane composite material for consumer electronics.

6. The method for producing thin polyurethane composite materials for consumer electronics according to claim 5, characterized in that, In step S1, the wet weight of the adhesion promoter emulsion is 20-30 g / cm³. 2 The drying temperature is 100-130℃ and the vehicle speed is 6-10m / min.

7. The method for producing thin polyurethane composite materials for consumer electronics according to claim 5, characterized in that, In step S2, the coating thickness of the water-based polyurethane surface slurry is 0.1-0.15 mm, and the drying temperature is 90-140℃ and the vehicle speed is 6-10 m / min.

8. The method for producing thin polyurethane composite materials for consumer electronics according to claim 5, characterized in that, In step S3, the coating thickness of the waterborne polyurethane intermediate layer slurry is 0.15-0.20 mm, and the drying temperature is 90-140℃ and the machine speed is 6-10 m / min.

9. The method for producing thin polyurethane composite materials for consumer electronics according to claim 5, characterized in that, In step S4, the coating thickness of the water-based polyurethane adhesive slurry is 0.2-0.25 mm, the drying temperature is 80-110℃, the drying and curing temperature is 140-160℃, and the vehicle speed is 6-10 m / min.