Glass fiber-based organic silicon-coated leather composite board and preparation method thereof

Abstract

The invention discloses a glass fiber-based organic silicon-coated leather composite board and a preparation method thereof. The glass fiber-based organic silicon-coated leather composite board comprises a surface treatment layer, an organic silicon surface material layer, an organic silicon bottom material layer, an adhesive layer and a semi-cured glass fiber board layer which are sequentially compounded from top to bottom, according to the invention, the process of coating the glass fiber board with the organic silicon leather is added in the preparation process of the glass fiber board, so that the composite board coated with the glass fiber and the organic silicon leather can be directly obtained, and the process is a novel integrated composite molding process of the organic silicon leather backboard, is simple and efficient, can greatly save time and reduce cost, and can be used for large-scale production; the organic silicon leather is adopted as new-generation environment-friendly leather, and compared with PU leather, the organic silicon leather has the advantages of being high in environment friendliness and flame retardance, soft and skin-friendly in hand feeling and the like.

Description

Technical Field

[0001] The invention relates to the technical field of electronic product back panel materials, and more particularly to a glass fiber-based organic silicon leather composite board and a preparation method thereof. Background Art

[0002] The back panels of existing 3C electronic products are basically made of glass fiber board (fiberglass board) as the soft-pack base layer, and then covered with cloth, leather, etc. as required. The leather and other appearance layers are attached to the fiberglass board through secondary processes such as bonding. The process is complicated and the cost is high. The leather is generally PU synthetic leather, which has poor flame retardancy and poor feel. Summary of the invention

[0003] In view of this, the present invention provides a glass fiber-based silicone leather composite board 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: A glass fiber-based silicone leather composite board comprises a surface treatment layer, a silicone surface layer, a silicone base material layer, an adhesive layer and a semi-cured glass fiber board layer which are composited in sequence from top to bottom.

[0005] Preferably, the surface treatment layer is composed of the following raw materials in parts by weight: 10-20 parts of anti-fouling agent, 5-10 parts of surface feel agent, 1-3 parts of curing agent, 0.5-1 parts of wear-resistant agent, and 0.5-1 parts of scratch-resistant agent.

[0006] Preferably, the organic silicon fabric layer is composed of the following raw materials in parts by weight: 40-100 parts of vinyl polysiloxane, 2-20 parts of hydrogen-containing polysiloxane, 20-40 parts of filler, 0-20 parts of color paste, 0.01-2 parts of catalyst, 0.003-0.05 parts of inhibitor and 10-20 parts of cross-linking agent.

[0007] Preferably, the filler is hydrophilic fumed silica, hydrophobic fumed silica, silicone resin, silicon powder, calcium carbonate, aluminosilicate, silicate, alumina, aluminum hydroxide, magnesium hydroxide, titanium dioxide or a mixture of any two or more thereof.

[0008] Preferably, the organic silicon base material layer is composed of the following raw materials in parts by weight: 40-65 parts of vinyl polysiloxane, 1-10 parts of hydrogen-containing polysiloxane, 10-20 parts of hydrophobic fumed silica, 0.01-1 parts of catalyst, 10-20 parts of cross-linking agent, and 1-10 parts of tackifier.

[0009] The present invention provides a method for preparing a glass fiber-based silicone leather composite board, comprising the following steps: S1, making a semi-cured glass fiber board layer; S2, making a silicone fabric layer; S3, preparing an organic silicon base material layer, and compounding the organic silicon base material layer with the organic silicon surface layer; S4, preparing an adhesive layer, and compounding the adhesive layer with the organic silicon base material layer; S5, the semi-cured glass fiber board layer prepared in step S1 is passed through a laminating introduction roller, with the adhesive layer as the bonding component, and the silicone fabric layer and the semi-cured glass fiber board layer are compounded through a laminating wheel, and the laminated product is dried at a temperature of 40°C-160°C in a bridge oven in a temperature increasing and decreasing manner; S6, preparing a surface treatment layer, and compounding the surface treatment layer with the organic silicon fabric layer to obtain a glass fiber-based organic silicon leather composite board.

[0010] Preferably, in step S1, the semi-cured glass fiber board layer is prepared by: mixing dimethylformamide and ethylene glycol methyl ether in a weight ratio of 1:2, stirring and mixing to form a mixed solvent, adding dicyandiamide, stirring and dissolving, adding a curing agent, stirring and mixing, and then adding a cross-linking accelerator, continuing to stir fully to obtain a glass fiber reinforced resin material, and putting it into a material trough for standby use; passing a glass fiber cloth through a guide roller and entering the material trough, and evenly impregnating the glass fiber reinforced resin material on the glass fiber cloth, and passing through a rubber squeezing roller to form a composite; and then entering an oven, the oven temperature is: 60-140°C, and then winding and cutting to obtain a semi-cured glass fiber board layer; Preferably, in step S2, the preparation method of the silicone fabric layer is: vinyl polysiloxane, hydrogen polysiloxane, filler, color paste, catalyst, inhibitor and cross-linking agent are mixed according to weight proportions, and configured into a uniform silicone coating under a vacuum environment, and the fully mixed silicone coating is evenly coated on the release surface of the polyester release film, and the coated product is vulcanized, dried and formed at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner, thereby obtaining the silicone fabric layer.

[0011] Preferably, in the step S3, the preparation method of the silicone base material layer is: vinyl polysiloxane, hydrogen polysiloxane, hydrophobic fumed silica, catalyst, cross-linking agent and tackifier are mixed according to weight proportions, and configured into a uniform silicone base material layer coating under vacuum, and the fully mixed silicone base material layer coating is uniformly coated on the silicone surface layer prepared in step S2, and the coated product is baked at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner until it is completely dry.

[0012] Preferably, in step S6, the surface treatment layer is prepared by: the anti-fouling agent, the surface feel agent, the curing agent, the wear-resistant agent, and the scratch-resistant agent are mixed and stirred in proportion by weight to form a surface treatment liquid, and the fully mixed surface treatment liquid is evenly coated on the surface of the silicone fabric layer prepared in step S2, the mesh roller is 130 mesh, and the coated product is dried at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner, and then a secondary surface treatment process is performed, and the final thickness of the surface treatment layer is controlled to be 0.2μm-1μm.

[0013] Preferably, the adhesive layer is prepared by selecting a commercial organic silicone adhesive and configuring it into a uniform adhesive layer coating, and the fully mixed adhesive layer coating is evenly coated on the organic silicone base material layer prepared in step S3, and the coated product is baked in a bridge oven at a temperature of 40°C-160°C in an increasing and decreasing manner until it is semi-dry, with a total thickness of about 0.05mm-0.3mm. This organic silicone adhesive layer will not deform in a high temperature environment of 280°C and still maintains strong bonding properties.

[0014] The invention provides a glass fiber-based organic silicon leather-coated mobile phone case. The glass fiber-based organic silicon leather-coated composite board is used, and a sheet with uniform thickness is formed by hot pressing at a temperature of 150°C-200°C and a pressure of 30-60Kg, and the sheet is cut; the cut sheet is fixed on a mobile phone case workpiece mold at a temperature of 140°C-200°C and a pressure of 30-60Kg, and preheated for 10-15min, and the temperature is adjusted to 30-50°C for cooling and shaping. After cooling, a polisher or a manual grinding tool is used to process the burrs and corners of the glass fiber-based organic silicon leather mobile phone case, so as to obtain a finished glass fiber-based organic silicon leather mobile phone case.

[0015] It can be seen from the above technical solution that, compared with the prior art, the glass fiber-based silicone leather composite board and the preparation method thereof provided by the present invention have the following beneficial effects: The present invention can directly obtain a glass fiber-coated silicone leather composite board by adding a glass fiber board-coated silicone leather process to the glass fiber board preparation process. The present invention is a novel silicone leather back panel integrated composite molding process, which is simple and efficient, can greatly save time, reduce costs, and can be mass-produced. The present invention adopts silicone leather as a new generation of environmentally friendly leather, which has the advantages of strong environmental protection, strong flame retardancy, soft touch and skin-friendliness compared to PU leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 The accompanying drawing is a schematic diagram of the overall structure of the glass fiber-based silicone leather composite board provided by the present invention; in, 1. Surface treatment layer; 2. Silicone surface layer; 3. Silicone base material layer; 4. Adhesive layer; 5. Semi-cured fiberglass board layer. DETAILED DESCRIPTION

[0018] 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.

[0019] Example 1 See also Figure 1 The embodiment of the present invention discloses a glass fiber-based silicone leather composite board, comprising a surface treatment layer 1, a silicone surface layer 2, a silicone base material layer 3, an adhesive layer 4 and a semi-cured glass fiber board layer 5 which are composited in sequence from top to bottom.

[0020] In order to further optimize the above technical solution, the surface treatment layer is composed of the following raw materials by mass: 10 parts of anti-fouling agent, 5 parts of surface feel agent, 1 part of curing agent, 0.5 parts of wear-resistant agent, and 0.5 parts of scratch-resistant agent.

[0021] In order to further optimize the above technical solution, the silicone fabric layer is composed of the following raw materials by mass: 40 parts of vinyl polysiloxane, 2 parts of hydrogen-containing polysiloxane, 20 parts of filler, 1 part of color paste, 0.01 parts of catalyst, 0.003 parts of inhibitor and 10 parts of cross-linking agent.

[0022] In order to further optimize the above technical solution, the filler is hydrophilic fumed silica, hydrophobic fumed silica, silicone resin, silicon micropowder, calcium carbonate, aluminosilicate, silicate, alumina, aluminum hydroxide, magnesium hydroxide, titanium dioxide or a mixture of any two or more thereof.

[0023] In order to further optimize the above technical solution, the silicone base material layer is composed of the following raw materials in parts by weight: 40 parts of vinyl polysiloxane, 1 part of hydrogen-containing polysiloxane, 10 parts of hydrophobic fumed silica, 0.01 parts of catalyst, 10 parts of crosslinking agent, and 1 part of tackifier.

[0024] The present invention provides a method for preparing a glass fiber-based silicone leather composite board, comprising the following steps: S1, making a semi-cured glass fiber board layer; S2, making a silicone fabric layer; S3, preparing an organic silicon base material layer, and compounding the organic silicon base material layer with the organic silicon surface layer; S4, preparing an adhesive layer, and compounding the adhesive layer with the silicone base material layer; S5, the semi-cured glass fiber board layer prepared in step S1 is passed through a laminating introduction roller, with the adhesive layer as the bonding component, and the silicone fabric layer and the semi-cured glass fiber board layer are compounded through a laminating wheel, and the laminated product is dried at a temperature of 40°C-160°C in a bridge oven in a temperature increasing and decreasing manner; S6. Prepare a surface treatment layer, and compound the surface treatment layer with the organic silicon fabric layer to obtain a glass fiber-based organic silicon leather composite board.

[0025] Among them, in step S1, the preparation method of the semi-cured glass fiber board layer is: taking epoxy resin as an example, dimethylformamide and ethylene glycol methyl ether in a weight ratio of 1:2 are stirred and mixed to form a mixed solvent, 1-5 parts of dicyandiamide are added, stirred and dissolved, 1-5 parts of curing agent are added, stirred and mixed, and then 1-5 parts of cross-linking accelerator are added, and continued to be fully stirred to obtain glass fiber reinforced resin material, which is put into a material trough for standby use; as required, a certain thickness of glass fiber cloth is unrolled, guided by a roller, and enters the material trough, and the glass fiber reinforced resin material is evenly impregnated on the glass fiber cloth, and composite molding is performed through a rubber squeezing roller, and the gap between the rubber squeezing rollers is adjusted to control the resin content; and then enters the oven, the oven temperature is: 60-140°C, during the oven, the solvent and other volatiles are removed, and the resin is in a semi-cured state, and then rolled and cut to obtain a semi-cured glass fiber board layer.

[0026] Among them, in step S2, the preparation method of the silicone fabric layer is: vinyl polysiloxane, hydrogen polysiloxane, filler, color paste, catalyst, inhibitor and cross-linking agent are mixed according to weight proportions, and configured into a uniform silicone coating under a vacuum environment, and the fully mixed silicone coating is evenly coated on the release surface of the polyester release film with a residual bonding strength of 30-70% using the slit coating head of a bridge coating machine, and the coated product is vulcanized, dried and formed at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner, thereby obtaining the silicone fabric layer; the number of silicone fabric layers can be designed from single layer to multi-layer according to the design requirements such as color and pattern, and the thickness of the layer is 0.001-1mm. This synthetic silicone fabric layer will not deform in a high temperature environment of 280°C and still maintains the original feel.

[0027] Among them, in step S3, the preparation method of the silicone primer layer is: vinyl polysiloxane, hydrogen polysiloxane, hydrophobic fumed silica, catalyst, cross-linking agent and tackifier are mixed according to weight proportions, and configured into a uniform silicone primer layer coating under vacuum, and the fully mixed silicone primer layer coating is evenly coated on the silicone surface layer prepared in step S2 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 completely dry state (a semi-dry state without an adhesive layer), with a total thickness of about 0.05mm-0.3mm. This silicone primer layer will not deform in a high temperature environment of 280°C and still maintains strong bonding properties.

[0028] Among them, in step S6, the preparation method of the surface treatment layer is: the anti-fouling agent (fluorinated silicone component), the surface feel agent, the curing agent, the wear-resistant agent, and the scratch-resistant agent are mixed and stirred according to the weight ratio to form a surface treatment liquid, and the fully mixed surface treatment liquid is evenly coated on the surface of the silicone fabric layer prepared in step S2 using the slit coating head of the bridge coating machine, the mesh roller is 130 mesh, and the coated product is dried at a temperature of 40°C-160°C in a bridge oven using an increasing and decreasing temperature method, and a secondary surface treatment process is performed according to the thickness requirement. The final thickness of the surface treatment layer is controlled at 0.2μm-1μm.

[0029] Among them, the method for making the adhesive layer is to select commercial organic silicone adhesive and configure it into a uniform adhesive layer coating, and use the slit coating head of the bridge coating machine to evenly coat the fully mixed adhesive layer coating on the organic silicone base material layer produced in step S3, and use the bridge oven to bake the coated product at a temperature of 40°C-160°C in an increasing and decreasing manner until it is a semi-dry state, with a total thickness of about 0.05mm-0.3mm. This organic silicone adhesive layer will not deform in a high temperature environment of 280°C and still maintains strong bonding properties.

[0030] Among them, the slit coating head and bridge oven of the bridge coating machine are existing conventional structures and will not be described in detail here.

[0031] Example 2 The embodiment of the present invention discloses a glass fiber-based silicone leather composite board, comprising a surface treatment layer 1, a silicone surface layer 2, a silicone base material layer 3, an adhesive layer 4 and a semi-cured glass fiber board layer 5 which are composited in sequence from top to bottom.

[0032] In order to further optimize the above technical solution, the surface treatment layer is composed of the following raw materials by mass: 20 parts of anti-fouling agent, 10 parts of surface feel agent, 3 parts of curing agent, 1 part of wear-resistant agent, and 1 part of scratch-resistant agent.

[0033] In order to further optimize the above technical solution, the silicone fabric layer is composed of the following raw materials by mass: 100 parts of vinyl polysiloxane, 20 parts of hydrogen-containing polysiloxane, 40 parts of filler, 20 parts of color paste, 2 parts of catalyst, 0.05 parts of inhibitor and 20 parts of crosslinking agent.

[0034] In order to further optimize the above technical solution, the filler is hydrophilic fumed silica, hydrophobic fumed silica, silicone resin, silicon micropowder, calcium carbonate, aluminosilicate, silicate, alumina, aluminum hydroxide, magnesium hydroxide, titanium dioxide or a mixture of any two or more thereof.

[0035] In order to further optimize the above technical solution, the silicone base material layer is composed of the following raw materials in parts by weight: 65 parts of vinyl polysiloxane, 10 parts of hydrogen-containing polysiloxane, 20 parts of hydrophobic fumed silica, 1 part of catalyst, 20 parts of crosslinking agent, and 10 parts of tackifier.

[0036] The preparation method of the glass fiber-based silicone leather composite board is the same as that of Example 1.

[0037] Example 3 The embodiment of the present invention provides a glass fiber-based silicone leather mobile phone case, which adopts a glass fiber-based silicone leather composite board, and is hot-pressed into a sheet with uniform thickness through a hot pressing molding step, at a temperature of 150°C-200°C and a pressure of 30-60Kg, and the sheet is cut; and the cut sheet is fixed on a mobile phone case workpiece mold, at a temperature of 140°C-200°C and a pressure of 30-60Kg, and preheated for 10-15 minutes, and the temperature is adjusted to 30-50°C for cooling and shaping. After cooling, a polisher or a manual grinding tool is used to process the burrs and corners of the glass fiber-based silicone leather mobile phone case to obtain a finished glass fiber-based silicone leather mobile phone case.

[0038] The polishing machine or manual polishing tool etc. are conventional structures used in the prior art and will not be described in detail here.

[0039] Verification Example The glass fiber-based silicone leather composite board prepared by the present invention was subjected to experimental verification tests, and the data obtained by verification are shown in the following table: Table 1 Test report of glass fiber-based silicone leather composite board (with substrate product type)

[0040] As shown in the above table, the glass fiber-based silicone leather composite board prepared by the present invention is highly environmentally friendly, flame retardant, soft and skin-friendly, has a simple and efficient process, can greatly save time, reduce costs, and can be mass-produced.

[0041] 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.

[0042] 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. A glass fiber-based silicone leather composite board, characterized in that: It comprises a surface treatment layer, an organic silicon surface layer, an organic silicon base material layer, an adhesive layer and a semi-cured glass fiber board layer which are compounded in sequence from top to bottom.

2. The glass fiber-based silicone leather composite board according to claim 1, characterized in that: The surface treatment layer is composed of the following raw materials in parts by mass: 10-20 parts of anti-fouling agent, 5-10 parts of surface feel agent, 1-3 parts of curing agent, 0.5-1 parts of wear-resistant agent, and 0.5-1 parts of scratch-resistant agent.

3. The glass fiber-based silicone leather composite board according to claim 1, characterized in that: The organic silicon fabric layer is composed of the following raw materials in parts by weight: 40-100 parts of vinyl polysiloxane, 2-20 parts of hydrogen-containing polysiloxane, 20-40 parts of filler, 0-20 parts of color paste, 0.01-2 parts of catalyst, 0.003-0.05 parts of inhibitor and 10-20 parts of cross-linking agent.

4. The glass fiber-based silicone leather composite board according to claim 3, characterized in that: The filler is hydrophilic fumed silica, hydrophobic fumed silica, silicone resin, silicon micropowder, calcium carbonate, aluminosilicate, silicate, alumina, aluminum hydroxide, magnesium hydroxide, titanium dioxide or a mixture of any two or more thereof.

5. The glass fiber-based silicone leather composite board according to claim 1, characterized in that: The organic silicon base material layer is composed of the following raw materials in parts by weight: 40-65 parts of vinyl polysiloxane, 1-10 parts of hydrogen-containing polysiloxane, 10-20 parts of hydrophobic fumed silica, 0.01-1 parts of catalyst, 10-20 parts of cross-linking agent, and 1-10 parts of tackifier.

6. A method for preparing a glass fiber-based silicone leather composite board, characterized in that: The following steps are involved: S1, making a semi-cured glass fiber board layer; S2, making a silicone fabric layer; S3, preparing an organic silicon base material layer, and compounding the organic silicon base material layer with the organic silicon surface layer; S4, preparing an adhesive layer, and compounding the adhesive layer with the organic silicon base material layer; the adhesive layer is prepared by preparing a commercial organic silicon adhesive into a uniform adhesive layer coating, and uniformly coating the fully mixed adhesive layer coating on the organic silicon base material layer prepared in step S3, and baking the coated product at a temperature of 40°C-160°C in a bridge oven in a manner of increasing and decreasing temperature until it is semi-dry; S5, the semi-cured glass fiber board layer prepared in step S1 is passed through a laminating introduction roller, with the adhesive layer as the bonding component, and the silicone fabric layer and the semi-cured glass fiber board layer are compounded through a laminating wheel, and the laminated product is dried at a temperature of 40°C-160°C in a bridge oven in a temperature increasing and decreasing manner; S6. Prepare a surface treatment layer, and compound the surface treatment layer with the organic silicon fabric layer to obtain a glass fiber-based organic silicon leather composite board.

7. The method for preparing a glass fiber-based silicone leather composite board according to claim 6, characterized in that: In the step S1, the semi-cured glass fiber board layer is prepared by: mixing dimethylformamide and ethylene glycol methyl ether in a weight ratio of 1:2, stirring and mixing to form a mixed solvent, adding dicyandiamide, stirring and dissolving, adding a curing agent, stirring and mixing, and then adding a cross-linking accelerator, continuing to stir fully, preparing a glass fiber reinforced resin material, and putting it into a material trough for standby use; passing a glass fiber cloth through a guide roller and entering the material trough, evenly impregnating the glass fiber reinforced resin material on the glass fiber cloth, and passing through a rubber squeezing roller for composite molding; Then it enters the oven with the temperature of 60-140℃, and is rolled up and cut to obtain a semi-cured glass fiber board layer.

8. The method for preparing a glass fiber-based silicone leather composite board according to claim 6, characterized in that: In step S2, the preparation method of the silicone fabric layer is: vinyl polysiloxane, hydrogen polysiloxane, filler, color paste, catalyst, inhibitor and cross-linking agent are mixed according to weight proportions, and configured into a uniform silicone coating under a vacuum environment, and the fully mixed silicone coating is evenly coated on the release surface of the polyester release film, and the coated product is vulcanized, dried and formed at a temperature of 40°C-160°C in a bridge oven in an increasing and decreasing manner, thereby preparing the silicone fabric layer.

9. The method for preparing a glass fiber-based silicone leather composite board according to claim 6, characterized in that: In the step S3, the preparation method of the silicone base material layer is: vinyl polysiloxane, hydrogen polysiloxane, hydrophobic fumed silica, catalyst, cross-linking agent and tackifier are mixed according to weight proportions, and configured into a uniform silicone base material layer coating under vacuum, and the fully mixed silicone base material layer coating is uniformly coated on the silicone surface layer prepared in step S2, and the coated product is baked at a temperature of 40°C-160°C in a bridge oven using a temperature increasing and decreasing manner until it is completely dry.

10. The method for preparing a glass fiber-based silicone leather composite board according to claim 6, characterized in that: In the step S6, the surface treatment layer is prepared by: the anti-fouling agent, the surface feel agent, the curing agent, the wear-resistant agent, and the scratch-resistant agent are mixed and stirred according to the weight ratio to form a surface treatment liquid, and the fully mixed surface treatment liquid is evenly coated on the surface of the silicone fabric layer prepared in step S2. The mesh roller has a mesh of 130, and the coated product is dried at a temperature of 40°C-160°C in a bridge oven using an increasing and decreasing temperature method, and then a secondary surface treatment process is performed. The final thickness of the surface treatment layer is controlled to be 0.2μm-1μm.

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