Ice-feeling polyurethane composite film and preparation method thereof

Abstract

The invention discloses an ice-feeling polyurethane composite film which comprises a texture color layer, an adhesive layer, a TPU layer, a hydrogel layer and a substrate layer which are sequentially compounded from top to bottom, the preparation method of the ice-feeling polyurethane composite film comprises the following steps: preparing hydrogel coating liquid; uniformly coating the hydrogel coating liquid on the lower surface of the TPU layer, and baking in a bridge type oven; compounding the substrate layer on the lower surface of the hydrogel layer to obtain an ice-feeling substrate; a texture color layer is manufactured, an adhesive layer is manufactured, the lower surface of the texture color layer is evenly coated with the adhesive layer, and baking is conducted in a bridge type oven; compounding the texture color layer on the upper surface of the TPU layer through the adhesive layer, and drying in a bridge type drying oven; aging and stripping to obtain an ice-feeling polyurethane composite film; the polyurethane composite film material with the ice feeling is prepared by compounding the polyurethane film and the hydrogel film and taking the PCM cold feeling phase change microcapsule as a filler, and has great application value in the fields of shoe materials, 3C electronic products, outdoor tents and the like.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane materials, and more particularly to an ice-sensing polyurethane composite film and a preparation method thereof. Background Art

[0002] TPU plastic film has the advantages of elasticity, wear resistance, anti-slip, antibacterial, moisture-proof, warmth, breathability and environmental protection; TPU plastic film is a special film material, which combines the toughness of polyurethane materials and the easy processing properties of plastics. At the same time, polyurethane resin has good bonding properties and can be composited with a variety of materials. Its various excellent properties are widely used in various fields, such as shoe materials, clothing, automobile manufacturing, chemical equipment, electronic products and medical devices; polyurethane composite film has the advantages of colorful, wear resistance, anti-slip, antibacterial, flame retardant, moisture-proof, warmth, breathability and environmental protection; while polyurethane film is a dense high molecular polymer with poor heat absorption and thermal conductivity, resulting in the polyurethane composite film product not having the characteristics of cooling and ice feeling. Summary of the invention

[0003] In view of this, the present invention provides an ice-sensing polyurethane composite film and a preparation method thereof, aiming to solve the above technical problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] An ice-feeling polyurethane composite film comprises a texture color layer, an adhesive layer, a TPU layer, a hydrogel layer and a base layer which are composited in sequence from top to bottom.

[0006] The present invention provides a method for preparing an ice-sensing polyurethane composite film, comprising the following steps:

[0007] S1, preparing a hydrogel coating solution;

[0008] Using water as solvent, polyvinyl alcohol, silicon dioxide, polyethylene glycol and polyurethane compatibilizer are mixed, heated and stirred to obtain a hydrogel coating liquid;

[0009] S2, uniformly coating the hydrogel coating liquid prepared in step S1 on the lower surface of the TPU layer, and baking it in a bridge oven;

[0010] S3, compounding the base layer onto the lower surface of the hydrogel layer to obtain an ice-feeling base material;

[0011] S4, making a texture color layer, making an adhesive layer, and evenly coating the adhesive layer on the lower surface of the texture color layer, and baking in a bridge oven to a semi-dry state;

[0012] S5, compounding the texture color layer onto the upper surface of the TPU layer through the adhesive layer, and drying it in a bridge oven;

[0013] S6, aging and peeling to obtain an ice-feeling polyurethane composite film.

[0014] Preferably, in step S1, water is used as a solvent, 5-20 parts of polyvinyl alcohol, 0.5-3 parts of silicon dioxide, 0.2-0.5 parts of polyethylene glycol and 1-3 parts of a polyurethane compatibilizer are mixed, heated and stirred to obtain a hydrogel coating solution.

[0015] Preferably, in step S2, when baking is performed in a bridge oven, the temperature is set to be increased from 40°C to 160°C, and after being increased to 160°C, the temperature is decreased from 160°C to 40°C.

[0016] Preferably, in step S3, the thickness of each component layer of the ice-feeling substrate is respectively: the thickness of the TPU layer is 0.1-0.25 mm, the thickness of the hydrogel layer is 0.1-0.35 mm, and the thickness of the base layer is 0.2-0.5 mm.

[0017] Preferably, in step S4, the texture color layer is prepared by preparing a uniform thermoplastic polyurethane coating with 70-100 parts of polyurethane resin, 0.03-1.5 parts of hydrolysis resistance agent, 0.1-1.5 parts of yellowing resistance agent, 3-10 parts of PCM cold phase change microcapsules, and 1-10 parts of color powder, and the fully mixed polyurethane coating is evenly coated on the release surface of the polyester release film, and dried in a bridge oven to obtain the texture color layer; wherein, when drying in the bridge oven, it is set to increase the temperature from 40°C to 160°C, and after increasing the temperature to 160°C, the temperature is reduced from 160°C to 40°C.

[0018] Preferably, in step S4, the adhesive layer is prepared by fully mixing 70-100 parts of polyurethane adhesive resin and 0.1-2 parts of hydrolysis resistance agent to prepare an adhesive layer coating.

[0019] It can be seen from the above technical solution that, compared with the prior art, the ice-sensing polyurethane composite film and the preparation method thereof provided by the present invention have the following beneficial effects:

[0020] The present invention prepares a polyurethane composite film material with a built-in icy feel by compounding a polyurethane film with a hydrogel film and using PCM cold-feel phase-change microcapsules as fillers. The polyurethane composite film material has great application value in the fields of footwear, 3C electronic products, outdoor tents, etc.

[0021] The ice-feeling polyurethane composite film produced by the present invention has the advantages of ice feeling, waterproof, UV resistance, wear resistance, low temperature resistance, high temperature resistance, and bending resistance. The preparation method of the ice-feeling polyurethane composite film is also a new type of ice-feeling polyurethane composite film preparation method. Through the dry coating-composite process, the processing is convenient and the operation is simple. The prepared ice-feeling substrate can be selected from PC, PMMA, TPU, glass fiber cloth, microfiber cloth, Jiaji cloth, etc. according to the application field, and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the overall structure of the ice-sensing polyurethane composite film provided by the present invention;

[0024] Figure 2 A schematic diagram of the preparation process of the ice-sensing polyurethane composite film provided by the present invention;

[0025] in:

[0026] 1. Texture color layer; 2. Adhesive layer; 3. TPU layer; 4. Hydrogel layer; 5. Base layer. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] See also Figure 1 The embodiment of the present invention discloses an ice-sensing polyurethane composite film, comprising a texture color layer 1, an adhesive layer 2, a TPU layer 3, a hydrogel layer 4 and a base layer 5 which are composited in sequence from top to bottom.

[0030] Among them, the base layer 5 can be divided into PC, PMMA, TPU, hot melt adhesive film, glass fiber cloth, microfiber cloth, Jiaji cloth, etc. according to the type of application field. This embodiment uses 0.2mm hot melt adhesive film and 0.2mm TPU layer 3.

[0031] The texture color layer 1 includes a PU texture color layer, a silicone texture color layer or a TPU texture color layer, wherein the texture design is one of release film transfer and embossing. This embodiment uses a PU texture color layer.

[0032] The adhesive layer 2 can be solvent-free adhesive, single / double-component adhesive, UV adhesive, hot melt adhesive or thermosetting adhesive. In this embodiment, polyurethane single-component adhesive is used.

[0033] Example 2

[0034] See also Figure 2 The embodiment of the present invention discloses a method for preparing an ice-sensing polyurethane composite film, comprising the following steps:

[0035] S1, preparing a hydrogel coating solution;

[0036] Using water as solvent, polyvinyl alcohol, silicon dioxide, polyethylene glycol and polyurethane compatibilizer are mixed, heated and stirred to obtain a hydrogel coating liquid;

[0037] Wherein, water is used as solvent, 5-20 parts of polyvinyl alcohol, 0.5-3 parts of silicon dioxide, 0.2-0.5 parts of polyethylene glycol and 1-3 parts of polyurethane compatibilizer are mixed, heated and stirred to obtain a uniform solution PVA hydrogel coating liquid.

[0038] S2, uniformly coating the hydrogel coating liquid prepared in step S1 on the lower surface of the TPU layer 3, and baking it in a bridge oven;

[0039] S3, compounding the base layer 5 on the lower surface of the hydrogel layer 4 to obtain an ice-feeling base material;

[0040] Among them, the ice-feeling base material is a three-layer structure of TPU / hydrogel / base layer, the thickness of TPU layer 3 is 0.1-0.25mm, the thickness of hydrogel layer 4 is 0.1-0.35mm, and the thickness of base layer 5 is 0.2-0.5mm. The base layer 5 is divided into PC, PMMA, TPU, hot melt adhesive film, glass fiber cloth, microfiber cloth, Jiaji cloth, etc. according to the application field type. Taking 0.2mm hot melt adhesive film and 0.2mm TPU as examples, through the coating process, on the surface of TPU film, through the precision coating knife Control, evenly apply the hydrogel coating liquid prepared in step S1, bake the coated product through a bridge oven to remove the moisture of the hydrogel coating liquid on the surface of TPU, and the hot melt adhesive film passes through the introduction roller and is compounded with TPU / hydrogel under the hot pressing roller to obtain TPU / hydrogel / base layer ice-feeling substrate; when baking in the bridge oven, it is set to heat from 40°C to 160°C, and after heating to 160°C, cool from 160°C to 40°C; the temperature of the hot pressing roller is 140-200°C.

[0041] S4, preparing a texture color layer 1, preparing an adhesive layer 2, and evenly coating the adhesive layer 2 on the lower surface of the texture color layer 1, and baking in a bridge oven to a semi-dry state;

[0042] S5, compounding the texture color layer 1 on the upper surface of the TPU layer 3 through the adhesive layer 2, and drying it in a bridge oven;

[0043] The texture color layer 1 is prepared in the following steps: the texture color layer 1 includes a PU texture color layer, a silicone texture color layer or a TPU texture color layer, wherein the texture design is one of release film transfer and embossing. Taking the PU texture color layer as an example, 70-100 parts of polyurethane resin, 0.03-1.5 parts of hydrolysis resistance agent, 0.1-1.5 parts of yellowing resistance agent, 3-10 parts of PCM cold-sensing phase change microcapsules, and an appropriate amount of color powder are used to prepare a uniform thermoplastic polyurethane coating, and the fully mixed polyurethane coating is coated using the slit of a bridge coating machine. The head is evenly coated on the release surface of the polyester release film with a residual bonding strength of 30-70%, and the coated product is dried at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner to obtain a texture color layer 1. The texture color layer 1 can be designed as a single layer or multiple layers according to the design requirements of color, pattern, etc., and the thickness of the layer is 0.005-0.5mm; wherein, when drying in the bridge oven, it is set to increase the temperature from 40°C to 160°C, and after heating to 160°C, it is cooled from 160°C to 40°C.

[0044] The steps for making the adhesive layer 2 are as follows: taking polyurethane single-component glue as an example, a uniform thermoplastic polyurethane adhesive layer coating is prepared according to 70-100 parts of polyurethane adhesive resin and 0.1-2 parts of hydrolysis resistant agent, and the fully mixed thermoplastic polyurethane adhesive layer coating is evenly coated on the lower surface of the texture color layer 1 using the slit coating head of a bridge coating machine, and the coated product is baked at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner to a semi-dry state, with a total thickness of about 0.02mm-1mm; wherein, when baking in the bridge oven, it is set to increase the temperature from 40°C to 160°C, and after heating to 160°C, it is cooled from 160°C to 40°C.

[0045] The compounding step is to compound the texture color layer 1 on the upper surface of the TPU layer 3 through the adhesive layer 2, and dry it in a bridge oven; specifically, the polyurethane adhesive is used as the bonding component, and the texture color layer 1 and the upper surface of the TPU layer 3 of the ice-feeling substrate are compounded through a bonding wheel, and the bonded product is dried at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner; when drying in the bridge oven, it is set to increase the temperature from 40°C to 160°C, and after heating to 160°C, it is cooled from 160°C to 40°C; bonding wheel temperature: 140-200°C, bonding wheel pressure: 30-60Kgf; the bridge coating machine, bonding wheel and bridge oven are all existing conventional structures and will not be repeated here.

[0046] S6, aging and peeling to obtain an ice-feeling polyurethane composite film.

[0047] Verification Example

[0048] The performance test of the ice-sensing polyurethane composite film prepared by the present invention is carried out, and the data are shown in the following table:

[0049] Table 1 is the test report of ice-sensing polyurethane composite film

[0050]

[0051] As shown in the above table, the ice-sensing polyurethane composite film prepared by the present invention has the advantages of ice-sensing, waterproof, UV-resistant, wear-resistant, low-temperature-resistant, high-temperature-resistant, and bending-resistant, and has great application value in the fields of shoe materials, 3C electronic products, outdoor tents, etc.

[0052] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ice-sensing polyurethane composite film, characterized in that: It includes a texture color layer, an adhesive layer, a TPU layer, a hydrogel layer and a base layer which are compounded in sequence from top to bottom.

2. A method for preparing an ice-sensing polyurethane composite film, characterized in that: The following steps are involved: S1, preparing a hydrogel coating solution; Using water as solvent, polyvinyl alcohol, silicon dioxide, polyethylene glycol and polyurethane compatibilizer are mixed, heated and stirred to obtain a hydrogel coating liquid; S2, uniformly coating the hydrogel coating liquid prepared in step S1 on the lower surface of the TPU layer, and baking it in a bridge oven; S3, compounding the base layer onto the lower surface of the hydrogel layer to obtain an ice-feeling base material; S4, making a texture color layer, making an adhesive layer, and evenly coating the adhesive layer on the lower surface of the texture color layer, and baking in a bridge oven to a semi-dry state; S5, compounding the texture color layer onto the upper surface of the TPU layer through the adhesive layer, and drying it in a bridge oven; S6, aging and peeling to obtain an ice-feeling polyurethane composite film.

3. The method for preparing an ice-sensing polyurethane composite film according to claim 2, characterized in that: In step S1, water is used as a solvent, 5-20 parts of polyvinyl alcohol, 0.5-3 parts of silicon dioxide, 0.2-0.5 parts of polyethylene glycol and 1-3 parts of a polyurethane compatibilizer are mixed, heated and stirred to obtain a hydrogel coating liquid.

4. The method for preparing an ice-sensing polyurethane composite film according to claim 2, characterized in that: In step S2, when baking is performed in the bridge oven, the temperature is set to be increased from 40°C to 160°C, and after being increased to 160°C, the temperature is decreased from 160°C to 40°C.

5. The method for preparing an ice-sensing polyurethane composite film according to claim 2, characterized in that: In step S3, the thickness of each component layer of the ice-feeling substrate is respectively: the thickness of the TPU layer is 0.1-0.25 mm, the thickness of the hydrogel layer is 0.1-0.35 mm, and the thickness of the base layer is 0.2-0.5 mm.

6. The method for preparing an ice-sensing polyurethane composite film according to claim 2, characterized in that: In step S4, the texture color layer is prepared by mixing 70-100 parts of polyurethane resin, 0.03-1.5 parts of hydrolysis resistance agent, 0.1-1.5 parts of yellowing resistance agent, 3-10 parts of PCM cold phase change microcapsules, and 1-10 parts of color powder to prepare a uniform thermoplastic polyurethane coating, and the fully mixed polyurethane coating is evenly coated on the release surface of the polyester release film, and dried in a bridge oven to obtain the texture color layer; wherein, when drying in the bridge oven, it is set to increase the temperature from 40°C to 160°C, and after increasing the temperature to 160°C, the temperature is reduced from 160°C to 40°C.

7. The method for preparing an ice-sensing polyurethane composite film according to claim 2, characterized in that: In step S4, the adhesive layer is prepared by fully mixing 70-100 parts of polyurethane adhesive resin and 0.1-2 parts of hydrolysis resistance agent to prepare an adhesive layer coating.

Images