Special gel-coated fiberglass sheet, preparation method and production line

Abstract

The present invention relates to the field of glass fiber reinforced plastics (FRP) technology, and more specifically, to a special gel-coated FRP sheet, a preparation method, and a production line. The special gel-coated FRP sheet comprises a base film, a transparent gel-coat layer, and a functional gel-coat layer, wherein the transparent gel-coat layer is located between the base film and the functional gel-coat layer. The transparent gel-coat layer comprises a thermosetting acrylic-modified unsaturated polyester resin and a photoinitiator, while the functional gel-coat layer comprises a thermosetting acrylic-modified unsaturated resin. The transparent gel-coat layer protects the functional gel-coat layer and significantly improves the corrosion resistance, aging resistance, and scratch resistance of the special gel-coated FRP sheet. The method and production line can achieve rapid and continuous production of FRP sheets, effectively improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of glass fiber reinforced plastics, and in particular to a special gel-coated glass fiber reinforced plastics plate, a preparation method and a production line. Background Art

[0002] At present, the common production method of FRP sheets is mainly to spray or scrape a layer of gel coat, then lay down layers of resin and glass fiber, and then go through a drying or room temperature curing step before demoulding to obtain the finished product.

[0003] However, existing production methods have significant shortcomings for some specialized gel coat applications. For example, in reflective sheet production, the gel coat contains glass beads. During production, the glass beads are mixed with the gel coat and applied to the mold surface by roller coating or spraying. After gelling, a base layer of resin and glass reinforcement fibers is applied, and the finished product is formed after curing. However, such finished products are prone to surface scratches during subsequent handling, installation, and use. This damages the original structure of the glass beads, weakening the light reflection intensity and affecting the normal use of the reflective sheet.

[0004] Similarly, in the production of composite color camouflage gelcoats, the camouflage effect is achieved by spraying or roller-coating the gelcoat with mixed colors onto a mold. The finished product is then reinforced with fiberglass. However, these finished products are also susceptible to surface scratches and marring during handling, installation, and use. Due to the multi-color nature of the product, any defects are difficult to repair aesthetically, negatively impacting the overall product quality and the user experience.

[0005] In summary, the existing FRP sheet production method has technical problems such as the surface of the finished product is easily damaged and difficult to repair when facing special gel coat applications, and urgently needs to be improved and optimized. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a special gel-coated glass fiber reinforced plastic plate, a preparation method and a production line.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] The present invention provides a special gel-coated fiberglass plate, comprising a base film, a transparent gel-coat layer and a functional gel-coat layer, wherein the transparent gel-coat layer is located between the base film and the functional gel-coat layer;

[0009] The material composition of the transparent gel coat layer includes thermosetting acrylic modified unsaturated polyester resin and photoinitiator;

[0010] The material composition of the functional gel coat layer includes thermosetting acrylic modified unsaturated resin, wherein the unsaturated resin is isophenyl neopentyl glycol resin.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, in the transparent gel coat layer, the photoinitiator is a TPO photoinitiator, and the mass percentage of the TPO photoinitiator is 0.05-0.5% of the total mass of the thermosetting acrylic modified unsaturated polyester resin.

[0013] Furthermore, in the functional gel coat layer, the mass percentage of the thermosetting acrylic resin is 5-10% of the mass of the isophenyl neopentyl glycol resin.

[0014] Furthermore, the functional gel coat layer is a glass microbead gel coat layer or a camouflage gel coat layer.

[0015] Furthermore, the transparent gel coat layer has a thickness of 0.1-0.3 mm, a light transmittance greater than or equal to 90%, and a haze of 30-40%.

[0016] The present invention also provides a method for preparing the special gel-coated fiberglass sheet as described above, comprising the steps of coating the material of the transparent gel-coat layer on the base film and curing it, and coating the material of the functional gel-coat layer on the transparent gel-coat layer and curing it.

[0017] Further, the following steps are included:

[0018] S1. Scrape or spray the transparent gel coat material on the base film;

[0019] S2, performing photocuring under ultraviolet light irradiation conditions of 285-365 nm to obtain the transparent gel coat layer;

[0020] S3, roller coating, spraying or blade coating the material of the functional gel coat layer on the transparent gel coat layer;

[0021] S4. Curing the obtained product by heating at a temperature of 40-80° C. to obtain the functional gel coat layer.

[0022] Furthermore, the method further comprises the following steps: sequentially preparing a resin fiber reinforcement layer and a backing layer on the functional gel coat layer to obtain the special gel coat fiberglass reinforced plastic sheet.

[0023] The present invention also provides a production line for special gel-coated fiberglass sheets, which is used to implement the above-mentioned preparation method. The production line includes a base film laying device, a transparent gel-coat layer preparation unit, and a functional gel-coat layer preparation unit arranged in sequence along the transmission direction.

[0024] Furthermore, the transparent gel coat layer preparation unit includes a first coating device and an ultraviolet curing furnace, and the functional gel coat layer preparation unit includes a second coating device and a resistance curing furnace.

[0025] The beneficial effects of the present invention are:

[0026] (1) The special gel-coated fiberglass sheet of the present invention has an additional transparent gel-coat layer on the functional gel-coat layer, which can protect the functional gel-coat layer and improve the corrosion resistance, aging resistance, scratch resistance and other properties of the special gel-coated fiberglass sheet;

[0027] (2) The special gel-coated fiberglass sheet of the present invention has a transparent gel-coated layer made of thermosetting acrylic modified unsaturated polyester resin, which has a high light transmittance and can be quickly repaired with acrylic glue to remove scratches on the surface.

[0028] (3) The special gel-coated fiberglass sheet of the present invention has a functional gel-coat layer whose main material is a thermosetting acrylic modified unsaturated resin, which has similar properties to the main material of the transparent gel-coat layer, so that the two can be tightly bonded and are not prone to delamination or bubbles;

[0029] (4) The special gel-coated fiberglass sheet of the present invention has a transparent gel-coat layer that can effectively improve the glossiness and light transmittance of the sheet, while greatly reducing the difficulty of maintenance and significantly extending the service life of the product;

[0030] (5) The method for preparing the special gel-coated FRP sheet of the present invention adopts ultraviolet light curing when applying the transparent gel-coat layer, which can realize the rapid and continuous production of the FRP sheet and effectively improve the production efficiency;

[0031] (6) The special gel-coated fiberglass sheet production line of the present invention can realize the continuous production of the special gel-coated fiberglass sheet of the present invention, with high production efficiency and good effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of the special gel-coated fiberglass sheet of the present invention;

[0033] Figure 2 This is a flow chart of the method for preparing the special gel-coated fiberglass reinforced plastic sheet of the present invention;

[0034] Figure 3 This is a structural schematic diagram of the special gel-coated fiberglass sheet production line of the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0036] 1. Base film; 2. Transparent gel coat layer; 3. Functional gel coat layer; 4. Resin fiber reinforcement layer; 5. Backing layer;

[0037] 100, base film laying device; 200, first coating device; 300, UV curing oven; 400, second coating device; 500, resistance curing oven; 600, resin table; 700, dipping device; 800, bubble removal roller; 900, pressure roller; 101, thermal curing oven; 102, traction device; 103, trimming device; 104, cross-cutting device. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] The special gel-coated fiberglass sheet of the present invention includes a base film 1, a transparent gel coat layer 2 and a functional gel coat layer 3, wherein the transparent gel coat layer 2 is located between the base film 1 and the functional gel coat layer 3; the material components of the transparent gel coat layer 2 include a thermosetting acrylic modified unsaturated polyester resin and a photoinitiator; the material components of the functional gel coat layer 3 include a thermosetting acrylic modified unsaturated resin, wherein the unsaturated resin is isophenyl neopentyl glycol resin.

[0040] The special gel-coated fiberglass sheet of the present invention incorporates a transparent gel coat layer 2 over the functional gel coat layer 3, which protects the functional gel coat layer 3 and significantly enhances the sheet's corrosion resistance, aging resistance, and scratch resistance. The transparent gel coat layer 2 is primarily made of a thermosetting acrylic-modified unsaturated polyester resin, offering a high light transmittance exceeding 90% and a haze of 30-40%. It is resistant to aging and surface scratches can be quickly repaired with acrylic glue without affecting light transmittance or haze, allowing the functional layer to function normally. Transparent gel coats are easier to repair than colored gel coats. In addition, the main material of the functional gel coat layer 3 is thermosetting acrylic modified isophenyl neopentyl glycol resin, which has similar properties to the main material of the transparent gel coat layer 2, so that the two can be tightly bonded and not prone to delamination and bubbles. However, if a board is coated with a conventional PET heat-sealing film, after being exposed to the sun, rain, thermal expansion and contraction for a long time, the surface will easily show obvious powdering, delamination and peeling, which seriously affects the transmittance and apparent performance.

[0041] The special gel-coated fiberglass sheet of the present invention is provided with a transparent gel-coat layer 2, which can effectively improve the glossiness and light transmittance of the sheet, while greatly reducing the difficulty of maintenance, and the service life of the product can be extended by 1 to 2 times.

[0042] Preferably, in the transparent gel coat layer 2, the photoinitiator is a TPO photoinitiator, and the mass percentage of the TPO photoinitiator is 0.05-0.5% of the total mass of the thermosetting acrylic modified unsaturated polyester resin; the TPO photoinitiator can achieve rapid UV curing, effectively improving preparation efficiency and product quality.

[0043] Preferably, the specific brand of TPO photoinitiator is: Omnirad TPO from IGM.

[0044] Preferably, the unsaturated polyester resin is #106 unsaturated polyester resin or #126 unsaturated polyester resin, #106 resin is isophthalic resin, and #126 is o-phthalic resin.

[0045] Preferably, in the functional gel coat layer 3, the thermosetting acrylic modified unsaturated resin includes isophenyl neopentyl glycol resin and thermosetting acrylic resin, and the mass percentage of the thermosetting acrylic resin is 5-10% of the mass of the isophenyl neopentyl glycol resin.

[0046] The specific preparation method of the thermosetting acrylic modified unsaturated polyester resin of the transparent gel coat layer 2 is as follows:

[0047] Weigh 100 parts of a thermosetting acrylic liquid resin with a molecular weight of 3000-5000 and 30 parts of propylene glycol methyl ether acetate; add the propylene glycol methyl ether acetate to the thermosetting acrylic resin and stir in a dispersing machine at 300-500 RPM at room temperature for 15 minutes to fully dissolve and disperse.

[0048] Weigh 1000-2000 parts of polyester resin, slowly add the above thermosetting acrylic resin mixture into the polyester resin using a high-speed disperser at a speed of 600-800 RPM, and disperse for 30 minutes to obtain a thermosetting acrylic resin modified unsaturated polyester resin with good compatibility.

[0049] The specific preparation method of the thermosetting acrylic modified unsaturated resin of the functional gel coat layer 3 is as follows:

[0050] Weigh 100 parts of a thermosetting acrylic liquid resin with a molecular weight of 3000-5000 and 30 parts of propylene glycol methyl ether acetate; add the propylene glycol methyl ether acetate to the thermosetting acrylic resin and stir in a dispersing machine at 300-500 RPM at room temperature for 15 minutes to fully dissolve and disperse.

[0051] Weigh 1000-2000 parts of isophenyl neopentyl glycol resin and slowly add the above-mentioned thermosetting acrylic resin mixture to the isophenyl neopentyl glycol resin using a high-speed disperser at a speed of 600-800 RPM. Disperse for 30 minutes to obtain a thermosetting acrylic resin-modified unsaturated resin with good compatibility.

[0052] When the functional gel coat layer 3 is made solely of isophenyl neopentyl glycol resin without thermosetting acrylic resin modification, its material and refractive index differ from those of the thermosetting acrylic-modified unsaturated polyester resin in the transparent gel coat layer 2. This can lead to localized color dispersion when the transparent gel coat layer 2 is uneven in thickness, affecting the surface consistency. Therefore, modifying the functional gel coat layer 3 with thermosetting acrylic resin not only improves interfacial compatibility with the transparent gel coat layer 2 but also prevents color dispersion.

[0053] Preferably, the functional gel coat layer 3 is a glass microbead gel coat layer or a camouflage gel coat layer.

[0054] Preferably, the thickness of the transparent gel coat layer 2 is 0.1-0.3 mm, the transmittance is greater than or equal to 90%, and the haze is 30-40%; while maintaining the transmittance and haze, the thickness of the transparent gel coat layer 2 is larger, and compared with the conventional paint surface which is usually only 0.01~0.05 mm thick, the transparent gel coat layer 2 has better scratch resistance.

[0055] Preferably, the thickness of the functional gel coat layer 3 is 0.1-0.5 mm.

[0056] The special gel-coated fiberglass sheet of the present invention is provided with a resin fiber reinforcement layer 4 and a backing layer 5 in sequence on the functional gel-coat layer 3. The resin fiber reinforcement layer 4 is prepared by using a matrix resin, a surface mat, a laminated glass fiber mat or a laminated glass fiber cloth.

[0057] It should be noted that, although the special gel-coated FRP sheet of the present invention is prepared on the base film 1, the base film 1 can be retained or removed according to actual needs.

[0058] The preparation method of the present invention comprises the steps of coating the material of the transparent gel coat layer 2 on the base film 1 and curing the same, and coating the material of the functional gel coat layer 3 on the transparent gel coat layer 2 and curing the same.

[0059] The specific steps include:

[0060] S1. Scrape or spray the transparent gel coat layer 2 onto the base film 1.

[0061] S2. Photocuring is performed under ultraviolet light irradiation conditions of 285-365 nm to obtain a transparent gel coat layer 2.

[0062] When applying the transparent gel coat layer 2, ultraviolet curing is adopted, which can realize the rapid and continuous production of the glass fiber reinforced plastic sheet and effectively improve the production efficiency.

[0063] S3. Roll-coat, spray-coat or knife-coat the material of the functional gel coat layer 3 on the transparent gel coat layer 2.

[0064] S4. Curing the obtained product at a temperature of 40-80° C. to obtain a functional gel coat layer 3.

[0065] In the above steps, the specific time of UV curing and heat curing can be determined according to actual production conditions.

[0066] Preferably, before the preparation, the materials for the transparent gel coat layer 2 and the materials for the functional gel coat layer 3 can be prepared separately.

[0067] After completing the above step S4, other layers can be prepared in a conventional manner to complete the preparation of the finished product of the special gel-coated fiberglass sheet.

[0068] Preferably, in one embodiment of the present invention, a resin fiber reinforcement layer 4 and a backing layer 5 are sequentially prepared on a functional gel coat layer 3 to obtain a special gel coat fiberglass sheet. Specifically, a surface mat is first laid on the functional gel coat layer 3, followed by a glass fiber mat or laminated glass fiber cloth. A matrix resin is then applied, and after degassing, a lamination operation is performed. The sheet is then placed in an oven for heating and curing, completing the preparation of the resin fiber reinforcement layer 4 and backing layer 5. The sheet is then rolled and cut to obtain a finished special gel coat fiberglass sheet. The sheet obtained after the lamination operation is the backing layer 5. In some embodiments, the lamination operation may not be performed, and accordingly, the fiberglass sheet does not have a backing layer 5.

[0069] The production line for producing special gel-coated fiberglass sheets of the present invention is used to implement the above-described production method. The production line comprises a base film laying device 100, a transparent gel coat preparation unit, and a functional gel coat preparation unit, arranged sequentially along a conveying direction. This production line enables continuous production of the special gel-coated fiberglass sheets of the present invention, achieving high production efficiency and excellent results.

[0070] Preferably, the transparent gel coat layer preparation unit includes a first coating device 200 and a UV curing oven 300 , and the functional gel coat layer preparation unit includes a second coating device 400 and a resistance curing oven 500 .

[0071] Preferably, the first coating device 200 is a scraper or a sprayer, and the second coating device 400 is a coating roller, a sprayer or a scraper.

[0072] The production line for special gel-coated fiberglass sheets of the present invention also includes devices for producing other layer structures. In one embodiment of the present invention, downstream of the functional gel-coat layer preparation unit, a resin station 600, a dipping device 700, a bubble removal roller 800, a pressing roller 900, a heat curing oven 101, a pulling device 102, a trimming device 103, and a cross-cutting device 104 are sequentially provided.

[0073] After the functional gel coat layer 3 is prepared in the resistance curing furnace 500, the sheet is then prepared with a resin fiber reinforcement layer 4 on the resin station 600. The sheet then passes through the resin impregnation device 700, the bubble removal roller 800, and the pressing roller 900 before entering the heat curing furnace 101 for heat curing, completing the preparation of the resin fiber reinforcement layer 4 and the backing layer 5. The sheet then passes through the traction device 102, the trimming device 103, and the cross-cutting device 104 to obtain the finished product of the special gel-coated fiberglass reinforced plastic sheet.

[0074] Preferably, the heating and curing temperature of the thermal curing oven 101 is 40-80°C.

[0075] The present invention is illustrated below by means of specific examples.

[0076] Example 1

[0077] This embodiment uses the method and production line of the present invention to prepare a special gel-coated fiberglass sheet, and tests the relevant properties of the special gel-coated fiberglass sheet.

[0078] Specifically, in the transparent gel coat layer 2 of the special gel-coated fiberglass sheet of this embodiment, the unsaturated polyester resin is #106 unsaturated polyester resin, and the photoinitiator is Omnirad TPO photoinitiator, with the mass percentage of Omnirad TPO photoinitiator accounting for 0.3% of the total mass of the thermosetting acrylic-modified unsaturated polyester resin. The thermosetting acrylic-modified unsaturated resin in the functional gel coat layer 3 includes isophenyl neopentyl glycol resin and thermosetting acrylic resin, with the mass percentage of the thermosetting acrylic resin accounting for 8% of the mass of the isophenyl neopentyl glycol resin. The transparent gel coat layer 2 has a thickness of 0.2 mm, a light transmittance of 93%, a haze of 35%, and an initial surface gloss of greater than 95 GU at 60°.

[0079] The special gel-coated FRP sheets were exposed to daily outdoor conditions for one year, and the aforementioned parameters were retested. The tests showed that the 60° glossiness of the used special gel-coated FRP sheets was greater than 80GU, and after a 3,000-hour aging test, the light transmittance was 90%.

[0080] Example 2

[0081] This embodiment uses the method and production line of the present invention to prepare a special gel-coated fiberglass sheet, and tests the relevant properties of the special gel-coated fiberglass sheet.

[0082] Specifically, in the transparent gel coat layer 2 of the special gel-coated fiberglass sheet of this embodiment, the unsaturated polyester resin is #126 unsaturated polyester resin, and the photoinitiator is Omnirad TPO photoinitiator, with the mass percentage of Omnirad TPO photoinitiator being 0.05% of the total mass of the thermosetting acrylic-modified unsaturated polyester resin. The thermosetting acrylic-modified unsaturated resin in the functional gel coat layer 3 includes isophenyl neopentyl glycol resin and thermosetting acrylic resin, with the mass percentage of the thermosetting acrylic resin being 5% of the mass of the isophenyl neopentyl glycol resin. The transparent gel coat layer 2 has a thickness of 0.1 mm, a light transmittance of 95%, a haze of 30%, and an initial surface gloss of greater than 98 GU at 60°.

[0083] The special gel-coated FRP sheets were exposed to outdoor conditions for one year and then retested for the aforementioned parameters. The test showed that the 60° glossiness of the sheets after use was greater than 88GU, and after a 3,000-hour aging test, the light transmittance was 92%.

[0084] Example 3

[0085] This embodiment uses the method and production line of the present invention to prepare a special gel-coated fiberglass sheet, and tests the relevant properties of the special gel-coated fiberglass sheet.

[0086] Specifically, in the transparent gel coat layer 2 of the special gel-coated fiberglass sheet of this embodiment, the unsaturated polyester resin is #106 unsaturated polyester resin, and the photoinitiator is Omnirad TPO photoinitiator, with the mass percentage of Omnirad TPO photoinitiator being 0.5% of the total mass of the thermosetting acrylic-modified unsaturated polyester resin. The thermosetting acrylic-modified unsaturated resin in the functional gel coat layer 3 includes isophenyl neopentyl glycol resin and thermosetting acrylic resin, with the mass percentage of the thermosetting acrylic resin being 10% of the mass of the isophenyl neopentyl glycol resin. The transparent gel coat layer 2 has a thickness of 0.3 mm, a light transmittance of 94%, a haze of 32%, and an initial surface gloss of greater than 94 GU at 60°.

[0087] The special gel-coated FRP sheets were exposed to daily outdoor conditions for one year, and the aforementioned parameters were retested. The tests showed that the 60° glossiness of the used special gel-coated FRP sheets was greater than 82GU, and after a 3,000-hour aging test, the light transmittance was 90%.

[0088] Example 4

[0089] This example uses the method and production line of the present invention to prepare a special gel-coated fiberglass sheet. The functional gel-coat layer 3 in the fiberglass sheet is specifically a camouflage gel-coat layer, a composite color camouflage wood grain gel-coat. This example also tests the relevant properties of the fiberglass sheet.

[0090] Specifically, in the transparent gel coat layer 2 of the fiberglass reinforced plastic sheet of this embodiment, the unsaturated polyester resin is #126 unsaturated polyester resin, and the photoinitiator is Omnirad TPO photoinitiator, with the mass percentage of Omnirad TPO photoinitiator being 0.1% of the total mass of the thermosetting acrylic-modified unsaturated polyester resin. The thermosetting acrylic-modified unsaturated resin in the functional gel coat layer 3 includes isophenyl neopentyl glycol resin and thermosetting acrylic resin, with the mass percentage of the thermosetting acrylic resin being 8% of the mass of the isophenyl neopentyl glycol resin. The colored gel coat product is opaque due to diffuse reflection and scattering effects of the matrix resin fibers and fillers, resulting in an initial surface gloss of 105 GU at 60°.

[0091] The composite color gel-coated fiberglass sheet was exposed to daily outdoor environment. After one year, the surface 60° glossiness parameter was tested again and found to be 95GU.

[0092] Comparative Example 1

[0093] The difference between this comparative example and Example 1 is that there is no transparent gel coat layer 2, and the other layer structures, components and test conditions are the same. The obtained ordinary plate has a light transmittance of 90%, a haze of 40%, and an initial 60° gloss of 90GU.

[0094] After testing, the 60° glossiness of ordinary panels after use is 50GU; after 3000 hours of aging test, the light transmittance is 84%.

[0095] The above examples and comparative examples show that, compared to the comparative examples, Examples 1-3 all exhibited higher light transmittance (93%-95%) than the comparative examples (90%), lower haze (30%-35%) than the comparative examples (40%), and higher initial 60° surface gloss (greater than 94-98 GU) than the comparative examples (90 GU). This demonstrates that the presence of the transparent gel coat layer 2 significantly improves the initial optical properties and surface gloss of the special gel coat fiberglass sheet.

[0096] After one year of outdoor exposure, the glossiness of Examples 1-3 (greater than 80 GU to 88 GU) was significantly higher than the 50 GU of the comparative example. Furthermore, the light transmittance after 3,000 hours of aging (90%-92%) was also higher than the 84% of the comparative example. This demonstrates that the transparent gel coat layer 2 significantly improves the aging resistance of the special gel-coated fiberglass sheet, enabling it to maintain better light transmittance and gloss during long-term use.

[0097] Comparative Example 2

[0098] The glass fiber reinforced plastic sheet in this comparative example does not contain the transparent gel coat layer 2. Its functional gel coat layer 3 is the same as that in Example 4, and the initial surface glossiness at 60° is greater than 98 GU.

[0099] The fiberglass sheets were exposed to daily outdoor conditions for one year and then tested again for the aforementioned glossiness parameters. The test showed that the 60° glossiness of the fiberglass sheets after use was greater than 90 GU.

[0100] In summary, adjusting the composition and thickness of the transparent gel coat layer 2 in Examples 1-4 significantly impacts the performance of the special gel-coated fiberglass sheet. Example 2 exhibits relatively balanced and excellent performance in terms of light transmittance, haze, initial surface gloss, and post-aging performance. Compared with Comparative Examples 1-2, the inclusion of the transparent gel coat layer 2 effectively improves the performance of the special gel-coated fiberglass sheet and enhances its durability in outdoor environments.

[0101] In addition, under the same usage conditions, the special gel-coated fiberglass sheets of Examples 1-4 have better scratch resistance, indicating that the transparent gel-coat layer 2 has a good protective effect on the functional gel-coat layer 3. When the functional gel-coat layer 3 is glass microbeads or a composite color camouflage gel-coat, its effect and service life are well guaranteed.

[0102] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A special gel-coated glass fiber reinforced plastic sheet, comprising a base film (1), characterized in that: It also includes a transparent gel coat layer (2) and a functional gel coat layer (3), wherein the transparent gel coat layer (2) is located between the base film (1) and the functional gel coat layer (3); The material composition of the transparent gel coat layer (2) includes thermosetting acrylic modified unsaturated polyester resin and photoinitiator; The transparent gel coat layer (2) has a thickness of 0.1-0.3 mm, a light transmittance greater than or equal to 90%, and a haze of 30-40%; The material composition of the functional gel coat layer (3) includes thermosetting acrylic modified unsaturated resin, wherein the unsaturated resin is isophthalic neopentyl glycol resin; In the functional gel coat layer (3), the mass percentage of the thermosetting acrylic resin is 5-10% of the mass of the isophenyl neopentyl glycol resin; The functional gel coat layer (3) is a glass microbead gel coat layer with a thickness of 0.1-0.5 mm.

2. The special gel-coated fiberglass sheet according to claim 1, characterized in that: In the transparent gel coat layer (2), the photoinitiator is a TPO photoinitiator, and the mass percentage of the TPO photoinitiator is 0.05-0.5% of the total mass of the thermosetting acrylic modified unsaturated polyester resin.

3. A method for preparing a special gel-coated fiberglass sheet according to claim 1 or 2, characterized in that: The method comprises the steps of coating the material of the transparent gel coat layer (2) on the base film (1) and curing the material, and coating the material of the functional gel coat layer (3) on the transparent gel coat layer (2) and curing the material.

4. The method for preparing a special gel-coated glass fiber reinforced plastic sheet according to claim 3, characterized in that: The following steps are involved: S1, scraping or spraying the material of the transparent gel coat layer (2) on the base film (1); S2, performing photocuring under ultraviolet light irradiation conditions of 285-365 nm to obtain the transparent gel coat layer (2); S3, rolling, spraying or scraping the material of the functional gel coat layer (3) onto the transparent gel coat layer (2); S4, heating and curing at a temperature of 40-80° C. to obtain the functional gel coat layer (3).

5. The method for preparing a special gel-coated fiberglass sheet according to claim 4, characterized in that: The following steps are also included: A resin fiber reinforcement layer (4) and a backing layer (5) are sequentially prepared on the functional gel coat layer (3) to obtain the special gel coat fiberglass reinforced plastic sheet.

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