Glass fiber reinforced polyurethane composite door and window profile formed by adopting injection, impregnation and pultrusion process as well as processing process and application of glass fiber reinforced polyurethane composite door and window profile

Abstract

The invention relates to a glass fiber reinforced polyurethane composite door and window profile formed by adopting an injection, impregnation and pultrusion process and a processing process and application thereof, belongs to the technical field of composite materials, and can be applied to the building field, such as door and window preparation. According to the scheme, the polyurethane material comprises a component A and a component B, the injection mass ratio of the component A to the component B is 100: (60-100), the component A comprises liquefied MDI, and the component B comprises 100 parts of flame-retardant polyether polyol, 2-10 parts of 1, 4-butanediol, 2-10 parts of calcium oxide, 0.3-0.5 part of dimethylethanolamine, 0.5-0.8 part of azodiisobutyronitrile, 0.5-1.5 parts of trimethylsiloxy silicate and 0.1-0.5 part of an organic silicon defoaming agent. The water content of the component B is controlled to be not higher than 0.05 wt%. According to the machining process, the glass fiber traction speed can be increased, meanwhile, the influence of bubble generation is reduced, the problem of heat stress concentration of a profile product is solved, and in addition, the shear strength performance of the profile in the vertical direction is improved.

Description

Technical Field

[0001] The present application relates to a glass fiber reinforced polyurethane composite door and window profile formed by an injection impregnation pultrusion process, its processing technology and application, belonging to the technical field of composite materials, and can be used in the building field such as the preparation of doors and windows. Background Art

[0002] In recent years, the energy-saving requirements in the construction industry have become an important part of China's sustainable development. Among the four main energy-consuming parts in buildings, namely doors and windows, exterior walls, roofs and floors, doors and windows have the characteristics of small thickness, single material and large contact area with the outside world compared with the other three parts, and their heat insulation performance is the worst. Therefore, enhancing the heat insulation performance of doors and windows and reducing the energy consumption of doors and windows have become the key research directions for improving the indoor thermal environment quality and the building energy-saving level.

[0003] Currently, the main door and window materials used in the prior art are mostly aluminum alloy and PVC. Among them, due to the low production threshold of PVC profiles and the pressure of user procurement costs, the quality of various PVC profile products is uneven. Various problems such as deformation and leakage have made the PVC plastic steel door and window products have a poor reputation in the market. Therefore, aluminum alloy profiles still dominate the market. However, due to the strong heat conduction ability of aluminum alloy profiles themselves, it is very unfavorable for energy conservation and is an important factor for the high energy-saving cost.

[0004] The glass fiber reinforced polyurethane pultruded door and window profile is a door and window profile produced by an injection impregnation pultrusion process with glass fiber as the reinforcing material and polyurethane as the matrix. Polyurethane itself has good heat insulation ability, so it has long been used in the energy-saving door and window industry to manufacture components such as foam sealants, sealing strips and heat insulation strips. Now, polyurethane is even used to manufacture the entire window frame material.

[0005] The polyurethane pultruded profile window frame dominated by the glass fiber reinforced polyurethane pultruded door and window profile has stronger dimensional stability, higher transverse mechanical properties, higher specific strength and rigidity compared with traditional materials, and at the same time has better heat insulation and heat preservation effects. In addition, its pultrusion process does not contain volatile organic compounds (VOCs), making the polyurethane pultruded profile window frame a popular material choice for energy conservation and environmental protection.

[0006] In the prior art, polyurethane pultruded profiles are mainly prepared by injection impregnation pultrusion process. Due to the process characteristics of reactive pultrusion molding, the prepolymer reacts and forms in a short time, which very easily leads to the concentration of thermal stress inside the product, resulting in internal defects in the product, thus affecting the hardness and strength of the product, and even cracks may appear. Moreover, in the prior art preparation process, the control of moisture is not strict, which easily leads to excessive bubbles in the product and affects the strength of the product. In addition, in the prior art, the traction speed of glass fiber is slow, and the processing process takes a long time, and there is still room for improvement. In addition, in the prior art, the strength in the stretching direction of the product can be guaranteed, however, the strength in the vertical direction of the profile, such as the shear strength performance, is slightly poor.

[0007] In view of the above problems existing in the pultruded door and window profiles in the prior art, it is necessary to provide a new processing technology for glass fiber reinforced polyurethane composite door and window profiles formed by injection impregnation pultrusion process to meet the market demand. Summary of the Invention

[0008] In order to solve the above problems, a glass fiber reinforced polyurethane composite door and window profile formed by injection impregnation pultrusion process, its processing technology and application are provided. The processing technology of the present application can increase the traction speed of glass fiber while reducing the influence of bubble generation, and improve the problem of thermal stress concentration of the profile product. In addition, the shear strength performance in the vertical direction of the profile is also improved.

[0009] The present application discloses a processing technology for a glass fiber reinforced polyurethane composite door and window profile formed by injection impregnation pultrusion process, and the processing technology includes the following steps: S1. Prepare continuous glass fiber, and after arranging it through a guiding plate under the traction of a traction machine, enter a forming die; S2. A syringe simultaneously injects polyurethane material into the forming die. While the polyurethane material is impregnated with the glass fiber, a polymerization reaction occurs, and under the continuous traction of the glass fiber, pultrusion molding is completed; S3. After cooling and leaving the forming die, obtain the glass fiber reinforced polyurethane composite door and window profile; The syringe includes syringe A and syringe B. The polyurethane material includes component A and component B. The injection mass ratio of component A and component B is 100:(60 - 100). Component A includes liquefied MDI. Component B includes, by weight fraction: 100 parts of flame retardant polyether polyol, 2 - 10 parts of 1,4 - butanediol, 2 - 10 parts of calcium oxide, 0.3 - 0.5 parts of dimethylethanolamine, 0.5 - 0.8 parts of azobisisobutyronitrile, 0.5 - 1.5 parts of trimethylsilyloxy silicate, and 0.1 - 0.5 parts of silicone defoaming agent. Syringe A and syringe B respectively contain component A and component B; Control the water content of component B to be no higher than 0.05 wt%.

[0010] Optionally, the glass fiber is pre-treated by surface modification, and the surface modification treatment includes the following steps: Heat the glass fiber to 50 - 80 °C for preheating; Immerse the preheated glass fiber in an impregnating agent for impregnation treatment for 20 - 60 min; After taking out the glass fiber and drying it, the surface-modified glass fiber is obtained; The impregnating agent includes, by weight: 20 - 40 parts of silane coupling agent KH-550, 10 - 30 parts of hydroxycellulose, 5 - 10 parts of lubricant, 2 - 5 parts of emulsifier, and 0.1 - 1.0 part of defoaming agent.

[0011] Optionally, the syringe further includes a premixer C, which is arranged after the syringe A and the syringe B. After the component A and the component B are mixed in the premixer C to form a polyurethane material, it then enters the molding die; The syringe A, the syringe B, and the premixer C are subjected to heat preservation treatment, and the temperature range is controlled at 25 - 40 °C; Preferably, the temperature range is controlled at 30 - 40 °C.

[0012] Optionally, the molding die is sequentially provided with a cooling zone 0.5 - 0.8 m long, a first heating zone 0.2 - 0.4 m long, a second heating zone 0.2 - 0.4 m long, and a third heating zone 0.2 - 0.4 m long; The temperature of the cooling zone is 40 - 70 °C, the temperature of the first heating zone is 100 - 120 °C, the temperature of the second heating zone is 120 - 150 °C, and the temperature of the third heating zone is 150 - 190 °C.

[0013] Optionally, a curing and holding zone 0.4 - 3.0 m long is provided after the third heating zone of the molding die; The temperature range of the curing and holding zone is the same as that of the third heating zone.

[0014] Optionally, the drawing speed of the glass fiber is 0.9 - 1.1 m / min.

[0015] Optionally, the glass fiber accounts for 75 - 78 wt% of the glass fiber-reinforced polyurethane composite door and window profiles.

[0016] Optionally, 1 - 5 parts of a flame retardant are further included in component B; Optionally, the flame retardant is antimony trioxide.

[0017] The present application provides a glass fiber reinforced polyurethane composite door and window profile prepared by the processing technology of the above-mentioned glass fiber reinforced polyurethane composite door and window profile formed by an injection dipping pultrusion process.

[0018] The present application provides the application of the above-mentioned glass fiber reinforced polyurethane composite door and window profile in building door and window products.

[0019] The beneficial effects of the present application include but are not limited to: 1. According to the glass fiber reinforced polyurethane composite door and window profile formed by an injection dipping pultrusion process of the present application, its processing technology and application, in the present application solution, adding trimethylsilyl silicate and 0.1 - 0.5 parts of an organosilicon defoaming agent to component B can effectively reduce the generation of bubbles caused by the relatively fast traction speed of glass fibers in the pultrusion process, thereby reducing the situation where larger bubbles are generated and affecting the product performance. And when the traction speed of the glass fiber is increased to 0.9 - 1.1 m / min, a good bubble control effect can also be maintained.

[0020] 2. According to the glass fiber reinforced polyurethane composite door and window profile formed by an injection dipping pultrusion process of the present application, its processing technology and application, aiming at another factor causing bubble generation, namely water, while controlling the water content of component B to be not higher than 0.05 wt%, adding calcium oxide to component B can, on the one hand, remove excess water to control the generation of bubbles, and on the other hand, calcium oxide and its products can also exist as fillers to improve the strength performance of the product.

[0021] 3. According to the glass fiber reinforced polyurethane composite door and window profile formed by an injection dipping pultrusion process of the present application, its processing technology and application, due to the characteristics of the pultrusion process itself, the performance in the pultrusion direction can be better guaranteed, while the performance in the vertical direction, especially the shear strength performance, is poor. Especially after the traction speed is increased to 0.9 - 1.1 m / min, the performance in the vertical direction is difficult to be guaranteed. For this reason, in the present application solution, by using the silane coupling agent KH550 to modify and pretreat the glass fiber, the performance in the vertical direction can be significantly improved, and KH550 shows better modification performance compared with other silane coupling agents such as KH570.

[0022] 4. The glass fiber reinforced polyurethane composite door and window profiles formed by the injection impregnation pultrusion process according to the present application, its processing technology and application. Aiming at the problem of heat stress release during the polyurethane forming process, it is mainly improved through the following three aspects: 1) Adding an ionic initiator azodiisobutyronitrile and dimethylethanolamine in component B can reduce the reaction degree during the mixing process of component A and component B, so that the components in the polyurethane material are more evenly mixed, thereby improving the uniformity of the reaction heat release during curing, avoiding the problem of heat stress concentration and difficult release caused by local overheating. In addition, the fluidity of the polyurethane material after mixing component A and component B is better, and it is not easy to cure, resulting in blockage of equipment during the impregnation process, reducing the frequency of equipment shutdown and cleaning, thereby improving production efficiency; 2) By optimizing the temperature conditions of heating and curing, better control of heat stress release during the curing process is achieved. In addition, due to the reaction heat release during the polyurethane curing process, setting a gradually increasing heating temperature can increase the external heating temperature while the curing reaction proceeds step by step and the internal reaction heat accumulates, ensuring the uniformity of the overall temperature of the product and also improving the problem of heat stress concentration; 3) A curing holding area is set after the third heating area. After the polyurethane reaction inside the profile is complete, the temperature begins to gradually decrease and curing is completed. During the process of gradually cooling inside, a relatively high heating temperature is still maintained outside, which can make the heat stress in the profile be released more completely from the inside to the outside.

[0023] 5. The glass fiber reinforced polyurethane composite door and window profiles formed by the injection impregnation pultrusion process according to the present application, its processing technology and application. Since the flame retardant property of glass fiber itself is better than that of polyurethane material, by controlling the dosage of glass fiber at a relatively high value of 75 - 78%, the profile can be ensured to have good flame retardant performance. In addition, in the solution, by using a flame retardant polyether polyol and adding a flame retardant antimony trioxide, the overall flame retardant performance of the profile can be further improved, making it more suitable for the flame retardant requirements of building door and window products. Specific embodiments

[0024] The present application is described in detail below in conjunction with embodiments, but the present application is not limited to these embodiments. Unless otherwise specified, the raw materials and reagents in the embodiments of the present application are purchased through commercial channels.

[0025] Example 1 The polyurethane material used in the impregnation process of the processing technology of this example is composed of component A and component B. The syringe structure in the processing equipment includes syringe A, syringe B and premixer C. Syringe A and syringe B respectively accommodate component A and component B, and after component A and component B are mixed in premixer C to form polyurethane material, it is then injected into the molding die.

[0026] Among them, component A is liquefied MDI (product number MDI-100HL, purchased from Wanhua Chemical), and component B is 100 parts of flame-retardant polyether polyol (product number YB-3028, purchased from Jiangyin Youbang Chemical Co., Ltd.), 6 parts of 1,4-butanediol, 6 parts of calcium oxide, 0.4 parts of dimethylethanolamine, 0.6 parts of azobisisobutyronitrile, 1.0 part of trimethylsiloxysilicate, 0.3 part of silicone defoaming agent (product number LT-4002, purchased from Lutai Ruida New Material Technology Co., Ltd.) and 3 parts of antimony trioxide.

[0027] The processing technology includes the following steps: S0. Pretreatment of pre-surface modification of glass fiber: 1) Heat the glass fiber to 65 °C for preheating; 2) Immerse the preheated glass fiber in the sizing agent for sizing treatment for 40 min; 3) Take out the glass fiber and dry it to obtain the surface-modified glass fiber. Among them, the sizing agent includes, by weight: 30 parts of silane coupling agent KH-550, 20 parts of hydroxycellulose, 7.5 parts of lubricant, 3.5 parts of emulsifier, 0.6 part of defoaming agent.

[0028] S1. Prepare continuous glass fiber. After being arranged by the guiding plate under the traction of the traction machine, it enters the forming die. S2. The syringe simultaneously injects the polyurethane material into the forming die, and controls the injection mass ratio of component A and component B to be 100:80. While the polyurethane material is impregnated with the glass fiber, a polymerization reaction occurs, and under the continuous traction of the glass fiber, pultrusion molding is completed. The traction speed of the glass fiber is 1.0 m / min. S3. After cooling and leaving the forming die, the glass fiber-reinforced polyurethane composite door and window profile is obtained, and by controlling the sizing process and subsequent forming process, the glass fiber accounts for 75-78 wt% of the total amount of the glass fiber-reinforced polyurethane composite door and window profile.

[0029] Specifically in the processing technology, the syringe A, syringe B and premixer C are heat-insulated, and the temperature range is controlled at 35 °C; the forming die is successively provided with a 0.6 m long cooling zone, a 0.3 m long first heating zone, a 0.3 m long second heating zone and a 0.3 m long third heating zone; the temperature of the cooling zone is 50 °C, the temperature of the first heating zone is 110 °C, the temperature of the second heating zone is 135 °C, and the temperature of the third heating zone is 170 °C; there is a 1.0 m long curing holding zone after the third heating zone of the forming die, and the temperature range of the curing holding zone is the same as that of the third heating zone.

[0030] Example 2 In the wetting process of the processing technology of this embodiment, the polyurethane material used is composed of component A and component B. The syringe structure in the processing equipment includes syringe A, syringe B, and premixer C. Syringe A and syringe B respectively accommodate component A and component B. After component A and component B are mixed in premixer C to form the polyurethane material, it is then injected into the molding die.

[0031] Among them, component A is liquefied MDI (product number MDI-100HL, purchased from Wanhua Chemical), and component B is 100 parts of flame-retardant polyether polyol (product number YB-3028, purchased from Jiangyin Youbang Chemical Co., Ltd.), 2 parts of 1,4-butanediol, 2 parts of calcium oxide, 0.3 parts of dimethylethanolamine, 0.5 parts of azobisisobutyronitrile, 0.5 parts of trimethylsiloxysilicate, 0.1 part of silicone defoaming agent (product number LT-4002, purchased from Lutai Ruida New Material Technology Co., Ltd.), and 1 part of antimony trioxide.

[0032] The processing technology includes the following steps: S0. Pretreatment of glass fiber pre-surface modification: 1) Heat the glass fiber to 50 °C for preheating; 2) Immerse the preheated glass fiber in the wetting treatment agent for 60 minutes for wetting treatment; 3) Take out the glass fiber and dry it to obtain the glass fiber after surface modification treatment. Among them, the wetting treatment agent includes, by weight: 20 parts of silane coupling agent KH-550, 10 parts of hydroxycellulose, 5 parts of lubricant, 2 parts of emulsifier, and 0.1 part of defoaming agent.

[0033] S1. Prepare continuous glass fiber. After being arranged by the guide plate under the traction of the tractor, it enters the molding die. S2. The syringe simultaneously injects the polyurethane material into the molding die, controlling the injection mass ratio of component A and component B to be 5:3. While the polyurethane material is impregnated with the glass fiber, a polymerization reaction occurs, and under the continuous traction of the glass fiber, pultrusion molding is completed. The traction speed of the glass fiber is 0.9 m / min. S3. After cooling and leaving the molding die, the glass fiber-reinforced polyurethane composite door and window profile is obtained, and by controlling the wetting process and subsequent molding process, the glass fiber accounts for 75-78% of the total amount of the glass fiber-reinforced polyurethane composite door and window profile.

[0034] Specifically in the processing technology, the syringe A, syringe B and premixer C are subjected to heat preservation treatment, and the temperature range is controlled at 25°C; the molding die is successively provided with a 0.5 m long cooling zone, a 0.4 m long first heating zone, a 0.4 m long second heating zone and a 0.2 m long third heating zone; the temperature of the cooling zone is 40°C, the temperature of the first heating zone is 100°C, the temperature of the second heating zone is 120°C, and the temperature of the third heating zone is 150°C; after the third heating zone of the molding die, there is a 0.4 m long curing and holding zone, and the temperature range of the curing and holding zone is the same as that of the third heating zone.

[0035] Example 3 In the infiltration process of the processing technology of this example, the polyurethane material used is composed of component A and component B. The syringe structure in the processing equipment includes syringe A, syringe B and premixer C. Syringe A and syringe B respectively contain component A and component B. After component A and component B are mixed in premixer C to form polyurethane material, it is then injected into the molding die.

[0036] Among them, component A is liquefied MDI (product number MDI-100HL, purchased from Wanhua Chemical), and component B is 100 parts of flame-retardant polyether polyol (product number YB-3028, purchased from Jiangyin Youbang Chemical Co., Ltd.), 10 parts of 1,4-butanediol, 10 parts of calcium oxide, 0.5 part of dimethylethanolamine, 0.8 part of azobisisobutyronitrile, 1.5 parts of trimethylsiloxysilicate, 0.5 part of organosilicon defoaming agent (product number LT-4002, purchased from Lutai Ruida New Material Technology Co., Ltd.) and 5 parts of antimony trioxide.

[0037] The processing technology includes the following steps: S0. Pretreatment of pre-surface modification of glass fiber: 1) Heat the glass fiber to 80°C for preheating; 2) Immerse the preheated glass fiber in the infiltration treatment agent for infiltration treatment for 20 min; 3) Take out the glass fiber and dry it to obtain the glass fiber after surface modification treatment. Among them, the infiltration treatment agent includes, by weight: 40 parts of silane coupling agent KH-550, 30 parts of hydroxycellulose, 10 parts of lubricant, 5 parts of emulsifier, 1.0 part of defoaming agent.

[0038] S1. Prepare continuous glass fiber. After being arranged by the guiding plate under the traction of the tractor, it enters the molding die. S2. The syringe injects polyurethane materials into the molding die simultaneously, controlling the injection mass ratio of component A and component B to be 1:1. While the polyurethane materials are impregnated with glass fibers, polymerization reaction occurs, and under the continuous traction of the glass fibers, pultrusion molding is completed. The traction speed of the glass fibers is 1.1 m / min. S3. After cooling and leaving the molding die, the glass fiber-reinforced polyurethane composite door and window profiles are obtained, and by controlling the impregnation process and subsequent molding process, the glass fiber accounts for 75 - 78% of the total amount of the glass fiber-reinforced polyurethane composite door and window profiles.

[0039] Specifically in the processing technology, syringe A, syringe B, and premixer C are heat-insulated, and the temperature range is controlled at 40 °C; the molding die is successively provided with a 0.8 m long cooling zone, a 0.2 m long first heating zone, a 0.2 m long second heating zone, and a 0.4 m long third heating zone; the temperature of the cooling zone is 60 °C, the temperature of the first heating zone is 120 °C, the temperature of the second heating zone is 150 °C, and the temperature of the third heating zone is 190 °C; after the third heating zone of the molding die, there is a 0.6 m long curing and holding zone, and the temperature range of the curing and holding zone is the same as that of the third heating zone.

[0040] Example 4 This example is basically the same as Example 1, except that the traction speed of the glass fibers is 0.8 m / min.

[0041] Example 5 This example is basically the same as Example 1, except that the silane coupling agent is replaced with an equal amount of KH560.

[0042] Example 6 This example is basically the same as Example 1, except that the silane coupling agent is replaced with an equal amount of KH570.

[0043] Example 7 This example is basically the same as Example 1, except that the temperatures of the first heating zone, the second heating zone, and the third heating zone are the same, which is 140 °C.

[0044] Example 8 This example is basically the same as Example 1, except that the curing and holding zone after the third heating zone is not provided.

[0045] Comparative Example 1 This comparative example is basically the same as Example 1, except that it does not contain calcium oxide and does not control the moisture content of component B. The water content of component B used in the detection is 0.12 wt%.

[0046] Comparative Example 2 This comparative example is basically the same as Example 1, except that trimethylsiloxysilicate is replaced with an equal amount of silicone defoamer.

[0047] Comparative Example 3 This comparative example is basically the same as Example 1, except that it does not include the pretreatment process of modifying the glass fiber.

[0048] Comparative Example 4 This comparative example is basically the same as Example 1, except that azobisisobutyronitrile is replaced with an equal amount of dimethylethanolamine.

[0049] Comparative Example 5 This comparative example is basically the same as Example 1, except that it does not contain azobisisobutyronitrile.

[0050] Test Example 1 The profiles obtained from the examples and comparative examples were subjected to performance tests. The test items included: interlaminar shear strength (MPa, GB / T 41501), flexural strength (MPa, GB / T 1449), tensile strength (MPa, ISO 527-4), thermal conductivity (W / m*K, GB / T 3139), and flame retardant grade. And the quality of the profiles prepared under each process condition was statistically analyzed to calculate the yield rate (%). The test results are shown in Table 1 below.

[0051] Table 1 Performance test results of profiles in examples and comparative examples

[0052] Continued Table 1

[0053] According to the results in Table 1, it can be seen that the adjustment and optimization of the processing technology and components in the solution of the present application realize the control of bubbles in the pultrusion process. By reducing the pores generated at the interface between polyurethane and glass fiber, the interfacial bonding performance between polyurethane and glass fiber in the pultrusion process is improved, and the shear strength performance of the profile is significantly enhanced.

[0054] In the solution of this application, by improving the components and optimizing the curing process, the thermal stress release of polyurethane in the pultrusion process can be significantly improved, and the yield rate of profiles can be significantly improved. After the pultruded profiles are cured, the bending caused by thermal stress release cannot be repaired by grinding, and grinding will damage the comprehensive performance of the profiles and make the products unusable. Therefore, once bending or deformation occurs, the profile products can only be discarded as waste. Therefore, the solution of this application can significantly reduce the production cost of profiles by controlling the thermal stress, enabling this process to improve the market competitiveness of glass fiber reinforced polyurethane door and window materials, which is of great significance for its wide application. On the other hand, the improvement of thermal stress can significantly reduce the generation of internal cracks in the profiles, and also improve the mechanical properties of the profiles such as tensile strength and bending strength, and the comprehensive performance of the profile products is improved.

[0055] At the same time, when the operator tested the processing technologies of Comparative Examples 4 and 5, it was found that the polyurethane material was very likely to cure and aggregate in the impregnating device, causing equipment blockage, and it was necessary to stop the machine more frequently for cleaning and maintenance. However, the solution of this application can significantly reduce the frequency of shutdown maintenance. For the continuous production process, the solution of this application can significantly improve the production efficiency, which is of great significance for improving the production benefit.

[0056] In addition, the profiles provided by the solution of this application have good heat insulation and flame retardant properties, can meet the requirements of the building materials for the heat preservation performance and flame retardant performance of the materials, and are suitable as building door and window profiles.

[0057] As mentioned above, only the embodiments of this application are given. The protection scope of this application is not limited by these specific embodiments, but is determined by the claims of this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of this application shall be included within the protection scope of this application.

Claims

1. A processing technology for glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process, characterized in that: The processing technology comprises the following steps: S1. Prepare continuous glass fibers, arrange them through a guide plate under the traction of a traction machine, and then enter a molding mold; S2. The syringe simultaneously injects the polyurethane material into the molding die. The polyurethane material undergoes a polymerization reaction while the glass fiber is impregnated with the polyurethane material. The glass fiber is continuously pulled to complete the pultrusion molding. S3, after leaving the molding die and cooling, the glass fiber reinforced polyurethane composite door and window profile is obtained; The syringe comprises a syringe A and a syringe B, the polyurethane material comprises a component A and a component B, the injection mass ratio of the component A to the component B is 100:(60-100), the component A comprises liquefied MDI, the component B comprises by weight: 100 parts of flame-retardant polyether polyol, 2-10 parts of 1,4-butanediol, 2-10 parts of calcium oxide, 0.3-0.5 parts of dimethylethanolamine, 0.5-0.8 parts of azobisisobutyronitrile, 0.5-1.5 parts of trimethylsiloxysilicate and 0.1-0.5 parts of silicone defoaming agent, the syringe A and the syringe B contain the component A and the component B respectively; The water content of component B is controlled to be no higher than 0.05 wt %.

2. The processing technology of glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process according to claim 1 is characterized in that: The glass fiber is pre-treated with a surface modification, and the surface modification treatment comprises the following steps: 1) Preheat the glass fiber to 50~80℃; 2) Immerse the preheated glass fiber in the impregnation agent for impregnation treatment for 20 to 60 minutes; 3) After taking out the glass fiber and drying it, the surface-modified glass fiber is obtained; The impregnation treatment agent comprises, by weight: 20 to 40 parts of silane coupling agent KH-550, 10 to 30 parts of hydroxy cellulose, 5 to 10 parts of lubricant, 2 to 5 parts of emulsifier, and 0.1 to 1.0 parts of defoamer.

3. The processing technology of glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process according to claim 1 is characterized in that: The syringe further comprises a premixer C, which is arranged behind the syringe A and the syringe B. After the components A and B are mixed in the premixer C to form a polyurethane material, the polyurethane material is then introduced into the molding die. The syringe A, syringe B and premixer C are subjected to heat preservation treatment, and the temperature range is controlled at 25-40° C.; Preferably, the temperature range is controlled at 30-40°C.

4. The processing technology of glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process according to claim 1 is characterized in that: The molding die is sequentially provided with a cooling zone of 0.5-0.8 m in length, a first heating zone of 0.2-0.4 m in length, a second heating zone of 0.2-0.4 m in length, and a third heating zone of 0.2-0.4 m in length; The temperature of the cooling zone is 40-70°C, the temperature of the first heating zone is 100-120°C, the temperature of the second heating zone is 120-150°C, and the temperature of the third heating zone is 150-190°C.

5. The processing technology of glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process according to claim 4 is characterized in that: A curing holding zone with a length of 0.4 to 3.0 m is provided after the third heating zone of the molding die; The temperature range of the curing holding zone is consistent with the temperature range of the third heating zone.

6. The processing technology of glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process according to claim 1 is characterized in that: The pulling speed of the glass fiber is 0.9-1.1 m / min.

7. The processing technology of glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process according to claim 1 is characterized in that: The glass fiber accounts for 75-78wt% of the glass fiber reinforced polyurethane composite door and window profile.

8. The processing technology of glass fiber reinforced polyurethane composite door and window profiles formed by injection dipping and pultrusion process according to claim 1 is characterized in that: The component B also includes 1 to 5 parts of flame retardant; Optionally, the flame retardant is antimony trioxide.

9. A glass fiber reinforced polyurethane composite door and window profile prepared by the processing technology of glass fiber reinforced polyurethane composite door and window profile formed by injection dipping and pultrusion process as claimed in any one of claims 1 to 8.

10. Use of the glass fiber reinforced polyurethane composite door and window profile as claimed in claim 9 in building door and window products.

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