Method for improving weather resistance of FRP polyurethane pultrusion profile

Abstract

The invention discloses a method for improving weather resistance of an FRP polyurethane pultruded profile, which belongs to the field of improving weather resistance and comprises the following steps: S1, leveling the surface of glass fiber reinforced plastic, namely leveling the surface of the glass fiber reinforced plastic, so that the glass fiber reinforced plastic is bent in the transportation and carrying process; according to the method, a to-be-processed glass fiber reinforced plastic raw material is extruded and leveled through leveling equipment, so that the surface of the glass fiber reinforced plastic returns to a horizontal state again, the accuracy and stability of the subsequent coating processing process are ensured, and the fitting stability of a weather-resistant coating can be effectively improved through the device; compared with a traditional processing method for improving weather resistance, according to the method, the bonding coating is added to the weather-resistant coating and the surface of the glass fiber reinforced plastic to serve as a connecting layer, meanwhile, curing and shaping are adopted firstly to facilitate subsequent coating processing, and then heating and melting are conducted, so that the contact faces of the multiple coatings are melted and bonded mutually, and therefore the connection stability of the method is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of improving weather resistance, in particular to a method for improving the weather resistance of a FRP polyurethane pultruded profile. Background Art

[0002] Glass fiber reinforced plastic (FRP) is also called GFRP, which means fiber reinforced plastic. It generally refers to reinforced plastics that use glass fiber to reinforce unsaturated polyester, epoxy resin and phenolic resin matrix, and use glass fiber or its products as reinforcement materials. It is called glass fiber reinforced plastic, or glass fiber reinforced plastic, which is different from tempered glass. The existing production methods of glass fiber reinforced plastic products mainly adopt hand lay-up, injection molding, fiber winding, compression molding, pultrusion molding and other production methods. Domestically, hand lay-up and fiber winding methods are mainly used to produce glass fiber reinforced plastic products. Among them, glass fiber reinforced plastic products used for water pollution prevention and control are mainly prepared by fiber winding, hand lay-up, conventional compression molding process, and fiber winding combined with hand lay-up. The fiber winding method alone is suitable for producing cylindrical or nearly cylindrical products, but it cannot produce flat-plate styles. In addition, fiber winding can only use the same resin or the same continuous fiber to produce glass fiber reinforced plastics with the same base material, which cannot meet the requirements of products with different material structures, and its tensile strength and bending strength are subject to certain limitations.

[0003] Materials such as coatings, building plastics, rubber products, etc., are used outdoors and are subjected to the test of climate, such as the combined damage caused by light, heat, cold, wind, rain, bacteria, etc. Their ability to withstand is called weather resistance.

[0004] FRP materials have the characteristics of light weight, high specific strength, corrosion resistance, good electrical insulation, slow heat transfer, good thermal insulation, good resistance to instantaneous ultra-high temperature, easy coloring, and the ability to transmit electromagnetic waves. Compared with commonly used metal materials, it also has the following characteristics: Since FRP products can be designed and manufactured according to different use environments and special performance requirements, as long as the appropriate raw materials are selected, the performance requirements of the products for different uses can basically be met. Therefore, FRP materials are a kind of material variety with designability. The one-time production of FRP products is another significant feature that distinguishes them from metal materials. As long as the appropriate raw material laying method and arrangement procedure are selected according to the product design, the FRP materials and structures can be completed in one go, avoiding the secondary processing usually required for metal materials, thereby greatly reducing the material consumption of the product and reducing the waste of manpower and material resources.

[0005] A Chinese patent with announcement number CN117103719A discloses a process for producing assembled weather-resistant fiberglass for water pollution control. The assembled weather-resistant fiberglass consists of a weather-resistant outer layer, a supporting reinforcement layer, an anti-seepage layer, and an anti-corrosion layer. Each layer is naturally cured without additional pressure or heating. The preparation process is energy-saving, environmentally friendly, green and low-carbon, so that the overall structure of the fiberglass product has high tensile strength and bending strength. In addition, through anti-corrosion, anti-seepage and anti-aging treatments, the finished product has relatively wide corrosion resistance and corrosion resistance, so that the assembled weather-resistant fiberglass can be applied to various facilities for water pollution control.

[0006] However, the above-mentioned publicly disclosed scheme has the following shortcomings: the above-mentioned scheme improves the weather resistance of FRP products by adding a weather-resistant anti-corrosion layer on the surface of FRP. In actual use, the multi-layer structure adopted by the above-mentioned method has the problem of surface coating falling off during use, which leads to unstable protection effect on the FRP material. Summary of the invention

[0007] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of the present invention to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0008] The purpose of the present invention is to address the technical problems existing in the background technology. The present invention proposes a method for improving the weather resistance of FRP polyurethane pultruded profiles. The present invention can effectively improve the fitting stability of the weather-resistant coating through the device. Compared with the traditional weather resistance improvement processing method, the present method adds an adhesive coating as a connecting layer between the weather-resistant coating and the fiberglass surface, and at the same time, first solidifies and shapes it to facilitate subsequent coating processing, and then melts it by heating, so that the contact surfaces of multiple coatings melt and adhere to each other, thereby ensuring the connection stability of the present method.

[0009] The present invention provides a method for improving the weather resistance of FRP polyurethane pultruded profiles, comprising the following steps: S1: Leveling the Fiberglass Surface Step. This step is to level the Fiberglass surface. Due to the organic molecular structure of the Fiberglass, the toughness of the Fiberglass is greater than that of common metal materials when it is used. Therefore, the Fiberglass may be bent during transportation, which results in the surface of the Fiberglass material being uneven. This step is to squeeze and level the Fiberglass raw material to be processed through a leveling device, so that the surface of the Fiberglass returns to a horizontal state, ensuring that the subsequent coating process is accurate and stable. S2 is a step of grinding the surface of the FRP, in which the leveled FRP surface is ground, so that the smooth surface of the FRP surface is ground into a frosted surface. This step can remove the smooth surface of the FRP surface, thereby increasing the surface area of ​​the FRP under a microscopic environment and increasing the contact area between the subsequent coating process and the FRP surface. The leveled FRP can achieve the same grinding degree at different positions of the FRP material during the grinding process; S3 is a step of adding an adhesive coating, in which the ground FRP raw material is fed into a coating processing device, and the device applies coating to the ground side of the FRP. Since the coating roller surface of the device is smoother than the ground surface of the FRP, the coating is more easily attached to the FRP surface during coating processing, achieving the coating processing effect, and at this time, the coating surface is sticky; S4 UV curing adhesive coating step, in which the adhesive coating is irradiated with a UV lamp so that the adhesive coating is rapidly solidified under the light, thereby making the adhesive coating surface non-adhesive. During the light irradiation process, since the adhesive coating is self-flowing solidified, uneven pits will appear on the adhesive coating surface after it is completely set. At this time, the surface of the cured adhesive coating is polished so that the adhesive coating surface is in a horizontal state and the adhesive coating surface is in a non-smooth state; S5: adding a weather-resistant coating step, in which a weather-resistant coating is added to the surface of the solidified and polished bonding coating by a coating processing device. At this time, since the bonding coating surface is polished and is in a non-smooth state, when the weather-resistant coating contacts the bonding coating surface, the fluid weather-resistant coating fills the polished gap on the bonding coating surface, so that the contact surfaces of the two coatings are fully in contact; S6 is a step of heating the multi-layer structure, in which the FRP and the two layered structures on its surface are simultaneously placed in a heating device for heating. During the heating process, the FRP material releases the stress stored inside it, and the adhesive coating melts again under high temperature conditions. At this time, the adhesive coating has adhesiveness again, and the fluidity of the weather-resistant coating increases under high temperature conditions, so that the two coatings can fully contact each other. The bubbles existing on the contact surface between the coatings are discharged under the action of the coating fluidity, thereby reducing the gaps and hollows between the coatings. S7 is a step of polishing the weather-resistant coating. After the heating step is completed, this step is to polish the surface of the cooled coating structure, thereby avoiding the problem of the rough surface of the weather-resistant coating after cooling due to the self-fluidizing solidification. The surface of the weather-resistant coating after polishing is smooth, thereby reducing the contact area between the surface of the weather-resistant coating and the external air environment.

[0010] By adopting the above technical solution, the present solution improves the coating setting stability of the present device by adding an adhesive coating between the weather-resistant coating and the fiberglass reinforced plastic material, thereby reducing the risk of coating shedding in the present solution.

[0011] Preferably, in the step of leveling the surface of the FRP, the FRP material is processed in a thermoplastic manner. Before the leveling process, the FRP material is preheated to reduce its hardness, so that it is convenient to restore the FRP material to a horizontal state by extrusion when entering the leveling equipment. The FRP material that has been leveled by extrusion can be shaped by rapid cooling to prevent it from bending again due to its own gravity. The cooling process should be in a horizontal clamping state to ensure that the cooling and shaping state is accurate.

[0012] By adopting the above technical solution, the present invention can effectively improve the processing accuracy of the surface flatness of the glass fiber reinforced plastic by means of heating for leveling and cooling for shaping.

[0013] Preferably, the S2 step of grinding the FRP surface uses a grinding device to grind the FRP surface. During the actual grinding process, the grinding device needs to be used together with an air blowing device to reduce the influence of FRP powder generated by grinding on the accuracy of the grinding process. At the same time, the FRP is grinded on one side or both sides according to the actual use environment requirements of the FRP.

[0014] By adopting the above technical solution, the present solution can increase the roughness of the surface of the FRP material by grinding the FRP surface, thereby preventing the adhesive coating from having insufficient contact with the FRP surface.

[0015] Preferably, the S2 step of grinding the FRP surface uses grinding structures of different mesh sizes to perform surface frosting and grinding for FRP materials of different thicknesses. Since thicker FRP materials have greater weight, the fixed points cannot be evenly distributed during use, so the edges of the FRP materials will bend due to their own weight when they are used and connected, and the surface of the bent part will expand, which will cause subsequent coatings to crack. Therefore, when processing weather-resistant coatings on thicker FRP materials, the degree of grinding should be greater than that on thinner FRP materials.

[0016] By adopting the above technical solution, this solution can ensure the stability of subsequent coating processing and ensure that the coating is in full contact with the fiberglass surface by adjusting the degree of grinding on the fiberglass surface.

[0017] Preferably, in the step of adding an adhesive coating in S3, during the process of processing the FRP surface by coating processing equipment, since there are tiny depressions on the FRP surface after grinding, it is necessary to use a paint roller to fully roll brush multiple times during the coating processing. After one rolling brushing, the FRP surface needs to be left standing for 15 minutes to allow the coating to flow into the depression by self-fluidization, and then the second rolling brushing is performed. After 3 to 5 rolling brushings, it is considered to be completed after observing that there are no raised positions on the FRP surface exposed on the coating surface.

[0018] By adopting the above technical solution, the present solution can improve the adhesion effect of the coating by repeated rolling and brushing, and at the same time increase the coating thickness. The thicker adhesive coating can facilitate subsequent grinding processing, ensuring the success rate and stability of the processing process of the present solution.

[0019] Preferably, in the S4UV curing adhesive coating step, a light box with a size close to that of the FRP material is required to be used to cure the adhesive coating on the FRP surface. During the curing process of the adhesive coating, the adhesive coating will shrink, and local curing will cause cracking after the overall adhesive coating is completely cured. Therefore, a light box structure with a similar size is used for overall synchronous curing, so that the coating is cured evenly to avoid cracking.

[0020] By adopting the above technical solution, this solution can ensure the smoothness of the coating surface by curing the adhesive coating and subsequent grinding processing, thereby preventing problems such as uneven flow of the subsequent weather-resistant coating.

[0021] Preferably, in the S4UV curing adhesive coating step, when the adhesive coating is polished after curing, the polishing mesh number used for polishing is smaller than the polishing mesh number for polishing the surface of the fiberglass reinforced plastic, and since the adhesive coating shrinks during the curing process, an arc-shaped slope will be generated at its edge. When polishing the adhesive coating, the sides of the fiberglass reinforced plastic should be polished at the same time to remove the slope portion at the edge of the adhesive coating.

[0022] By adopting the above technical solution, this solution can ensure that the surface is smoother by grinding the bonding coating and the edge of the fiberglass material, while the surface of the bonding coating is rough enough, so that the contact area between the bonding coating and the weather-resistant coating is sufficient.

[0023] Preferably, in the step of adding a weather-resistant coating in S5, since there are tiny depressions on the surface of the adhesive coating, when adding the weather-resistant coating, the method of adding the weather-resistant coating should be the same as that of adding the adhesive coating and the weather-resistant coating should be rolled multiple times.

[0024] By adopting the above technical solution, the present solution can increase the thickness of the weather-resistant coating by rolling and brushing multiple times.

[0025] Preferably, in the step S6 of heating the multi-layer structure, the heating temperature controlled by the heater in this step should be higher than the melting temperature of the adhesive coating and lower than the melting temperature of the weather-resistant coating. Since the heater needs to pass through the weather-resistant coating to align with the adhesive coating below for heating, the fiberglass material should be kept in a horizontal state during use to avoid the flow of the melted adhesive coating.

[0026] Preferably, in the step of polishing the weather-resistant coating in S7, the weather-resistant coating may be polished by a wool wheel or other structure, and the polishing effect may ultimately achieve a mirror effect, and the edge of the weather-resistant coating may droop and wrap around the side of the adhesive coating to ensure that the weather-resistant coating is wrapped stably.

[0027] In summary, the present invention includes at least one of the following beneficial effects: This device prevents problems such as coating shedding due to long-term sunlight exposure by adding an adhesive coating between the weather-resistant coating and the fiberglass. At the same time, the interlayer adhesive coating will not affect the structural strength of the fiberglass itself, ensuring the stability of the material used in this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 A front view of an embodiment of a method for improving weather resistance of a FRP polyurethane pultruded profile of the present invention; DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 The present invention is described in further detail. Example

[0031] like Figure 1 As shown, in this embodiment, in order to solve the existing problems, the present invention discloses a method for improving the weather resistance of FRP polyurethane pultruded profiles, comprising the following steps: S1: Leveling the Fiberglass Surface Step. This step is to level the Fiberglass surface. Due to the organic molecular structure of the Fiberglass, the toughness of the Fiberglass is greater than that of common metal materials when it is used. Therefore, the Fiberglass may be bent during transportation, which results in the surface of the Fiberglass material being uneven. This step is to squeeze and level the Fiberglass raw material to be processed through a leveling device, so that the surface of the Fiberglass returns to a horizontal state, ensuring that the subsequent coating process is accurate and stable. S2 is a step of grinding the surface of the FRP, in which the leveled FRP surface is ground, so that the smooth surface of the FRP surface is ground into a frosted surface. This step can remove the smooth surface of the FRP surface, thereby increasing the surface area of ​​the FRP under a microscopic environment and increasing the contact area between the subsequent coating process and the FRP surface. The leveled FRP can achieve the same grinding degree at different positions of the FRP material during the grinding process; S3 is a step of adding an adhesive coating, in which the ground FRP raw material is fed into a coating processing device, and the device applies coating to the ground side of the FRP. Since the coating roller surface of the device is smoother than the ground surface of the FRP, the coating is more easily attached to the FRP surface during coating processing, achieving the coating processing effect, and at this time, the coating surface is sticky; S4 UV curing adhesive coating step, in which the adhesive coating is irradiated with a UV lamp so that the adhesive coating is rapidly solidified under the light, thereby making the adhesive coating surface non-adhesive. During the light irradiation process, since the adhesive coating is self-flowing solidified, uneven pits will appear on the adhesive coating surface after it is completely set. At this time, the surface of the cured adhesive coating is polished so that the adhesive coating surface is in a horizontal state and the adhesive coating surface is in a non-smooth state; S5: adding a weather-resistant coating step, in which a weather-resistant coating is added to the surface of the solidified and polished bonding coating by a coating processing device. At this time, since the bonding coating surface is polished and is in a non-smooth state, when the weather-resistant coating contacts the bonding coating surface, the fluid weather-resistant coating fills the polished gap on the bonding coating surface, so that the contact surfaces of the two coatings are fully in contact; S6 is a step of heating the multi-layer structure, in which the FRP and the two layered structures on its surface are simultaneously placed in a heating device for heating. During the heating process, the FRP material releases the stress stored inside it, and the adhesive coating melts again under high temperature conditions. At this time, the adhesive coating has adhesiveness again, and the fluidity of the weather-resistant coating increases under high temperature conditions, so that the two coatings can fully contact each other. The bubbles existing on the contact surface between the coatings are discharged under the action of the coating fluidity, thereby reducing the gaps and hollows between the coatings. S7 is a step of polishing the weather-resistant coating. After the heating step is completed, this step is to polish the surface of the cooled coating structure, thereby avoiding the problem of the rough surface of the weather-resistant coating after cooling due to the self-fluidizing solidification. The surface of the weather-resistant coating after polishing is smooth, thereby reducing the contact area between the surface of the weather-resistant coating and the external air environment. Example

[0032] like Figure 1As shown, in order to solve the existing problems, based on the same concept as the above-mentioned embodiment 1, the method for improving the weather resistance of FRP polyurethane pultruded profiles also includes: the step of leveling the glass fiber reinforced plastic surface, which uses a thermoplastic method to process the glass fiber reinforced plastic material. Before the leveling process, the glass fiber reinforced plastic material is preheated to reduce its hardness, so that it is convenient to restore the glass fiber reinforced plastic material to a horizontal state by extrusion when entering the leveling equipment, and the glass fiber reinforced plastic material that has been extruded and leveled can be shaped by rapid cooling, thereby preventing it from bending again due to its own gravity, and its cooling process should be in a horizontal clamping state to ensure that the cooling and shaping state is accurate.

[0033] The S2 step of grinding the surface of the FRP uses a grinding device to grind the surface of the FRP. In the actual grinding process, the grinding device needs to be used together with an air blowing device to reduce the influence of the FRP powder generated by grinding on the accuracy of the grinding process. At the same time, the FRP is ground on one side or both sides according to the actual use environment requirements of the FRP.

[0034] The S2 step of grinding the surface of the FRP uses grinding structures of different mesh sizes to perform surface frosting and grinding for FRP materials of different thicknesses. Since the thicker FRP material has a greater weight, the fixed points cannot be evenly distributed during use, so the edges of the FRP material will bend due to its own weight when it is used and connected, and the surface of the bent part will expand, which will cause subsequent coatings to crack. Therefore, when the thicker FRP is subjected to weather-resistant coating processing, the degree of grinding should be greater than that of the thinner FRP material.

[0035] The step of adding adhesive coating in S3 is a step of processing the FRP surface by coating processing equipment. Since there are tiny depressions on the surface of the FRP after grinding, it is necessary to use a paint roller to roll and brush it multiple times during the coating processing. After one rolling and brushing, the FRP surface needs to be left standing for 15 minutes to allow the coating to flow into the depression by self-fluidization. The second rolling and brushing is performed. After 3 to 5 rolling and brushing, it is considered to be completed after observing that there are no raised positions on the FRP surface exposed on the coating surface.

[0036] The S4UV curing adhesive coating step requires the use of a light box with a size close to that of the FRP material to cure the adhesive coating on the FRP surface. During the curing process of the adhesive coating, the adhesive coating will shrink, and the use of local curing will cause cracking after the overall adhesive coating is completely cured. Therefore, a light box structure with a similar size is used for overall synchronous curing, so that the coating is cured evenly to avoid cracking.

[0037] In the S4UV curing adhesive coating step, when the adhesive coating is polished after curing, the polishing structure mesh number used for polishing is smaller than the polishing mesh number of the glass fiber reinforced plastic surface, and since the adhesive coating shrinks during the curing process, an arc-shaped slope surface will be generated at its edge. When polishing the adhesive coating, the sides of the glass fiber reinforced plastic should be polished to remove the slope surface portion at the edge of the adhesive coating.

[0038] The step of adding the weather-resistant coating in S5 should be repeated with the same method as the adhesive coating, as there are tiny depressions on the surface of the adhesive coating when adding the weather-resistant coating.

[0039] The S6 step of heating the multi-layer structure, when in use, the heating temperature controlled by the heater should be higher than the melting temperature of the adhesive coating and lower than the melting temperature of the weather-resistant coating. Since the heater needs to pass through the weather-resistant coating to align with the adhesive coating below for heating, when in use, it should be ensured that the fiberglass material is in a horizontal state to prevent the melted adhesive coating from flowing.

[0040] The step S7 of polishing the weather-resistant coating may be performed by polishing the weather-resistant coating through a wool wheel or other structure. The polishing effect is ultimately based on a mirror effect. The edge of the weather-resistant coating should droop and wrap around the side of the adhesive coating to ensure that the weather-resistant coating is wrapped stably.

[0041] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for improving the weather resistance of FRP polyurethane pultruded profiles, characterized in that: The following steps are involved: S1: Leveling the Fiberglass Surface Step. This step is to level the Fiberglass surface. Due to the organic molecular structure of the Fiberglass, the toughness of the Fiberglass is greater than that of common metal materials when it is used. Therefore, the Fiberglass may be bent during transportation, which results in the surface of the Fiberglass material being uneven. This step is to squeeze and level the Fiberglass raw material to be processed through a leveling device, so that the surface of the Fiberglass returns to a horizontal state, ensuring that the subsequent coating process is accurate and stable. S2 is a step of grinding the surface of the FRP, in which the leveled FRP surface is ground, so that the smooth surface of the FRP surface is ground into a frosted surface. This step can remove the smooth surface of the FRP surface, thereby increasing the surface area of ​​the FRP under a microscopic environment and increasing the contact area between the subsequent coating process and the FRP surface. The leveled FRP can achieve the same grinding degree at different positions of the FRP material during the grinding process; S3 is a step of adding an adhesive coating, in which the ground FRP raw material is fed into a coating processing device, and the device applies coating to the ground side of the FRP. Since the coating roller surface of the device is smoother than the ground surface of the FRP, the coating is more easily attached to the FRP surface during coating processing, achieving the coating processing effect, and at this time, the coating surface is sticky; S4 UV curing adhesive coating step, in which the adhesive coating is irradiated with a UV lamp so that the adhesive coating is rapidly solidified under the light, thereby making the adhesive coating surface non-adhesive. During the light irradiation process, since the adhesive coating is self-flowing solidified, uneven pits will appear on the adhesive coating surface after it is completely set. At this time, the surface of the cured adhesive coating is polished so that the adhesive coating surface is in a horizontal state and the adhesive coating surface is in a non-smooth state; S5: adding a weather-resistant coating step, in which a weather-resistant coating is added to the surface of the solidified and polished bonding coating by a coating processing device. At this time, since the bonding coating surface is polished and is in a non-smooth state, when the weather-resistant coating contacts the bonding coating surface, the fluid weather-resistant coating fills the polished gap on the bonding coating surface, so that the contact surfaces of the two coatings are fully in contact; S6 is a step of heating the multi-layer structure, in which the FRP and the two layered structures on its surface are simultaneously placed in a heating device for heating. During the heating process, the FRP material releases the stress stored inside it, and the adhesive coating melts again under high temperature conditions. At this time, the adhesive coating has adhesiveness again, and the fluidity of the weather-resistant coating increases under high temperature conditions, so that the two coatings can fully contact each other. The bubbles existing on the contact surface between the coatings are discharged under the action of the coating fluidity, thereby reducing the gaps and hollows between the coatings. S7 is a step of polishing the weather-resistant coating. After the heating step is completed, this step is to polish the surface of the cooled coating structure, thereby avoiding the problem of the rough surface of the weather-resistant coating after cooling due to the self-fluidizing solidification. The surface of the weather-resistant coating after polishing is smooth, thereby reducing the contact area between the surface of the weather-resistant coating and the external air environment.

2. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 1, characterized in that: The step of leveling the surface of the fiberglass reinforced plastics uses a thermoplastic method to process the fiberglass reinforced plastics material. Before the leveling process, the fiberglass reinforced plastics material is preheated to reduce its hardness, so that it is easy to restore the fiberglass reinforced plastics material to a horizontal state by extrusion when entering the leveling equipment. The fiberglass reinforced plastics material that has been extruded and leveled can be shaped by rapid cooling to prevent it from bending again due to its own gravity. The cooling process should be in a horizontal clamping state to ensure that the cooling and shaping state is accurate.

3. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 2, characterized in that: The S2 step of grinding the surface of the FRP uses a grinding device to grind the surface of the FRP. In the actual grinding process, the grinding device needs to be used together with an air blowing device to reduce the influence of the FRP powder generated by grinding on the accuracy of the grinding process. At the same time, the FRP is ground on one side or both sides according to the actual use environment requirements of the FRP.

4. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 3, characterized in that: The S2 step of grinding the surface of the FRP uses grinding structures of different mesh sizes to perform surface frosting and grinding for FRP materials of different thicknesses. Since the thicker FRP material has a greater weight, the fixed points cannot be evenly distributed during use, so the edges of the FRP material will bend due to its own weight when it is used and connected, and the surface of the bent part will expand, which will cause subsequent coatings to crack. Therefore, when the thicker FRP is subjected to weather-resistant coating processing, the degree of grinding should be greater than that of the thinner FRP material.

5. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 4, characterized in that: The step of adding adhesive coating in S3 is a step of processing the FRP surface by coating processing equipment. Since there are tiny depressions on the surface of the FRP after grinding, it is necessary to use a paint roller to roll and brush it multiple times during the coating processing. After one rolling and brushing, the FRP surface needs to be left standing for 15 minutes to allow the coating to flow into the depression by self-fluidization. The second rolling and brushing is performed. After 3 to 5 rolling and brushing, it is considered to be completed after observing that there are no raised positions on the FRP surface exposed on the coating surface.

6. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 5, characterized in that: The S4UV curing adhesive coating step requires the use of a light box with a size close to that of the FRP material to cure the adhesive coating on the FRP surface. During the curing process of the adhesive coating, the adhesive coating will shrink, and the use of local curing will cause cracking after the overall adhesive coating is completely cured. Therefore, a light box structure with a similar size is used for overall synchronous curing, so that the coating is cured evenly to avoid cracking.

7. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 6, characterized in that: In the S4UV curing adhesive coating step, when the adhesive coating is polished after curing, the polishing structure mesh number used for polishing is smaller than the polishing mesh number of the glass fiber reinforced plastic surface, and since the adhesive coating shrinks during the curing process, an arc-shaped slope surface will be generated at its edge. When polishing the adhesive coating, the sides of the glass fiber reinforced plastic should be polished to remove the slope surface portion at the edge of the adhesive coating.

8. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 7, characterized in that: The step of adding the weather-resistant coating in S5 should be repeated with the same method as the adhesive coating, as there are tiny depressions on the surface of the adhesive coating when adding the weather-resistant coating.

9. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 8, characterized in that: The S6 step of heating the multi-layer structure, when in use, the heating temperature controlled by the heater should be higher than the melting temperature of the adhesive coating and lower than the melting temperature of the weather-resistant coating. Since the heater needs to pass through the weather-resistant coating to align with the adhesive coating below for heating, when in use, it should be ensured that the fiberglass material is in a horizontal state to prevent the melted adhesive coating from flowing.

10. A method for improving weather resistance of FRP polyurethane pultruded profile according to claim 9, characterized in that: The step S7 of polishing the weather-resistant coating may be performed by polishing the weather-resistant coating through a wool wheel or other structure. The polishing effect is ultimately based on a mirror effect. The edge of the weather-resistant coating should droop and wrap around the side of the adhesive coating to ensure that the weather-resistant coating is wrapped stably.

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