Production process of ultra-low energy consumption polyurethane steel-encased fire window and fire window

Abstract

The application relates to a production process of an ultra-low-energy-consumption polyurethane steel-clad fireproof window and the fireproof window. The production process comprises the following steps: polyurethane fireproof resin is infiltrated into fireproof fiber to obtain polyurethane fireproof prepreg; a steel lining and the polyurethane fireproof prepreg are extruded through a co-extrusion die head, the polyurethane fireproof prepreg is attached to the outer surface of the steel lining, curing and shaping are carried out, a prefabricated section is formed, the prefabricated section is internally provided with the steel lining; polyurethane foaming material is injected into the inner side wall of the prefabricated section to form a heat insulation layer on the inner side wall of the prefabricated section, a window frame section and a window sash section are obtained; the window frame section, the window sash section and fireproof glass are assembled to obtain the ultra-low-energy-consumption polyurethane steel-clad fireproof window. The ultra-low-energy-consumption polyurethane steel-clad fireproof window can meet the performance requirement that the fireproof integrity is not lower than 1.0 h, has good fireproof performance, and simultaneously has good air tightness, water tightness, wind resistance and pressure resistance, heat preservation and heat insulation effects, and the advantages of low energy consumption.

Description

Technical Field

[0001] This application relates to the field of fireproof window technology, and more specifically, to a manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window and the fireproof window itself. Background Technology

[0002] Fire-resistant windows refer to window systems, including their frames, that meet the requirements for fire resistance stability and fire resistance integrity. Currently, fire-resistant windows are generally divided into two types: Class A insulated and Class C non-insulated. Class A insulated windows not only possess fire resistance integrity but also provide insulation. According to the national standard GB / T 31433-2015 "General Technical Conditions for Building Curtain Walls, Doors and Windows," fire resistance integrity refers to the ability of a building's doors and windows to prevent flames and hot gases from penetrating or causing flames to appear on the unexposed side for a certain period of time when exposed to fire on one side under standard fire resistance test conditions. According to the national standard GB 50016-2014 "Code for Fire Protection Design of Buildings," when the fire resistance rating of the interior and exterior walls is less than 1.00h, the doors of the room should preferably be Class B fire doors, and the fire resistance integrity of the exterior windows should not be less than 1.0h.

[0003] Fire-resistant windows are mainly composed of window frame profiles, fire-resistant glass, flame-retardant sealing strips, fire-resistant hardware, and other auxiliary accessories. Among these, the window frame profiles and fire-resistant glass are the main factors affecting the fire resistance performance of fire-resistant windows. Currently, the window frame profiles for fire-resistant windows generally include aluminum alloy, steel, wood, and PVC. Steel and wooden windows have good fire resistance, but their airtightness, watertightness, and durability are relatively poor. Aluminum alloy and PVC window frames have good airtightness, watertightness, and durability, but their low melting points make them prone to frame deformation and sealing failure at high temperatures. Therefore, current fire-resistant window frame profiles still cannot simultaneously meet the requirements for fire resistance and airtightness. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window and the fireproof window itself.

[0005] According to the first aspect of this application, a manufacturing process for an ultra-low energy consumption polyurethane-clad steel fireproof window is provided, employing the following technical solution: A manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window includes the following steps: Polyurethane refractory resin is impregnated with refractory fibers to obtain polyurethane refractory prepreg; The steel lining and the polyurethane refractory prepreg are extruded through a co-extrusion die, so that the polyurethane refractory prepreg is attached to the outer surface of the steel lining. After curing and shaping, a prefabricated profile with an internal steel lining is formed. Polyurethane foam is injected into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile, thereby obtaining window frame profile and window sash profile. The window frame profile, the window sash profile, and the fireproof glass are assembled to obtain the ultra-low energy consumption polyurethane-coated steel fireproof window.

[0006] In some embodiments of this application, the weight ratio of the polyurethane refractory resin to the refractory fiber is 1:2-3; The polyurethane refractory resin comprises the following raw materials in parts by weight: 15-25 parts polyurethane resin, 5-8 parts flame retardant, 3-5 parts glass powder, 2-4 parts kaolin, 0.5-1 parts compatibilizer, and 0.5-1 parts dispersant.

[0007] In some embodiments of this application, the refractory fiber includes one or more of glass fiber, carbon fiber, basalt fiber, and aluminosilicate fiber.

[0008] In some embodiments of this application, the compatibilizer comprises 3-aminopropyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane in a weight ratio of 1:1-3.

[0009] In some embodiments of this application, the flame retardant comprises magnesium dihydrogen phosphate and aluminum hydroxide in a weight ratio of 1:2-3.

[0010] In some embodiments of this application, the production process further includes, prior to co-extruding the steel lining with the polyurethane refractory resin: Apply an adhesion promoter to the surface of the steel liner; The thickener comprises the following raw materials in parts by weight: 50-60 parts aluminum dihydrogen phosphate, 20-30 parts kaolin, 10-20 parts attapulgite, 10-20 parts silica fume, 3-8 parts polyvinyl alcohol, 3-5 parts sorbitol, 1-2 parts citric acid, and 150-160 parts water.

[0011] In some embodiments of this application, the method for preparing the thickener includes the following steps: Aluminum dihydrogen phosphate, kaolin, attapulgite, silica powder and water are mixed and stirred at 200-600 rpm for 10-20 minutes at 90-95℃ to obtain a mixture. Polyvinyl alcohol, sorbitol and citric acid are added to the mixture and stirred until homogeneous to obtain a thickener.

[0012] In some embodiments of this application, before applying an adhesion promoter to the surface of the steel liner, the manufacturing process further includes: The steel lining is preheated at a temperature of 120-140°C.

[0013] In some embodiments of this application, the co-extrusion temperature is 150-160℃; the curing temperature for curing is 170-180℃, and the curing time is 20-30 min.

[0014] According to a second aspect of this application, an ultra-low energy consumption polyurethane-clad steel fireproof window is provided, which is produced using the above-mentioned manufacturing process.

[0015] In summary, this application has the following beneficial effects: The ultra-low energy consumption polyurethane-coated steel fireproof window of this application can meet the performance requirement of fire resistance integrity of not less than 1.0h, and has excellent fire resistance performance; at the same time, the air tightness is level 6 or above, the water tightness is level 3 or above, and the wind and pressure resistance is level 5 or above, which combines good air tightness, water tightness and wind and pressure resistance performance, and can effectively reduce the penetration of heat and smoke; it has good heat preservation and heat insulation effect, and has the advantage of low energy consumption. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0017] In one exemplary embodiment, this application provides a manufacturing process for an ultra-low energy consumption polyurethane-clad steel fireproof window, comprising the following steps: Polyurethane refractory resin is impregnated with refractory fibers to obtain polyurethane refractory prepreg; The steel lining and polyurethane refractory prepreg are extruded through a co-extrusion die, so that the polyurethane refractory prepreg is attached to the outer surface of the steel lining. After curing and shaping, a prefabricated profile with an internal steel lining is formed. Polyurethane foam is injected into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile, thus obtaining window frame profile and window sash profile. By assembling window frame profiles, window sash profiles, and fireproof glass, an ultra-low energy consumption polyurethane-coated steel fireproof window is obtained.

[0018] The window frame and sash profiles of this application form a structure consisting of a polyurethane insulation layer, a steel lining, and a polyurethane fire-resistant layer from the inside to the outside. This structure can meet the performance requirement of fire resistance integrity of not less than 1.0h, while also having good air tightness, water tightness, heat insulation, thermal insulation performance, and durability. It can effectively reduce the penetration of heat and smoke and has the advantage of low energy consumption.

[0019] Taking window frame profiles as an example, the polyurethane fire-resistant layer, as the outermost layer of the window frame profile, is formed by curing polyurethane fire-resistant prepreg. Polyurethane is a thermosetting material, which will form a carbonized layer on the surface after being exposed to fire, preventing the flame from penetrating deeper. The fire-resistant barrier made of fire-resistant fibers can effectively slow down the combustion, making it difficult for the flame to burn to the inside of the fireproof window.

[0020] As the intermediate layer of the window frame profile, the steel lining enhances the strength of the window frame itself, thereby improving its stability and durability. In the event of a fire, the steel lining prevents the frame from deforming, providing effective support. Furthermore, even if the outer polyurethane fire-resistant layer carbonizes in a fire, the steel lining protects the inner polyurethane insulation layer, ensuring the fire resistance integrity of the fire-resistant window.

[0021] As the innermost layer of the window frame profile, the polyurethane insulation layer is formed by polyurethane foam. Under normal conditions, it can play a role in heat insulation and heat preservation, which can improve the heat preservation, air tightness and water tightness of fire-resistant windows, thereby reducing the energy consumption of fire-resistant windows. In the event of a fire, it can also play a role in heat insulation, effectively reducing the indoor temperature.

[0022] However, due to the significant difference in chemical composition between the polyurethane refractory layer and the steel lining, the bonding strength between them is relatively low. In the event of fire, the polyurethane refractory layer and the steel lining are prone to separation, leading to a decrease in fire resistance. Therefore, this application employs a steel-clad co-extrusion method to co-extrude the steel lining and the polyurethane refractory prepreg, ensuring a tight bond between the inner wall of the polyurethane refractory layer and the surface of the steel lining. This prevents separation between the polyurethane refractory layer and the steel lining, thereby improving the fire resistance integrity of the fire-resistant window.

[0023] In this embodiment, prefabricated profiles can be prepared using a pultrusion molding process. During the polyurethane pultrusion process, more refractory fibers can be used, which greatly improves the strength and fire resistance of the profiles.

[0024] For example, the manufacturing process of ultra-low energy consumption polyurethane-coated steel fireproof windows includes the following steps: The steel strip is cold-bent into steel lining according to the product design requirements; refractory fibers are placed in the injection box and arranged according to the product design requirements; then polyurethane refractory resin is injected into the injection box so that the refractory fibers are fully impregnated by the polyurethane refractory resin to obtain polyurethane refractory prepreg.

[0025] The steel lining and polyurethane refractory prepreg are fed to the co-extrusion equipment, where they are extruded through the same co-extrusion die. The polyurethane refractory prepreg adheres to the outer surface of the steel lining. After curing and shaping, the inner wall of the polyurethane refractory layer is tightly bonded to the steel lining to form a prefabricated profile with the polyurethane refractory layer on the outside and the steel lining on the inside.

[0026] Polyurethane foam is injected into the inner wall of a prefabricated profile through injection molding to form a heat insulation layer on the inner wall of the profile. The resulting profile can be used as a window frame profile and a window sash profile.

[0027] By assembling window frame profiles, window sash profiles, and fireproof glass, an ultra-low energy consumption polyurethane-coated steel fireproof window is obtained.

[0028] In one exemplary embodiment, the weight ratio of polyurethane refractory resin to refractory fiber is 1:2-4; The polyurethane refractory resin comprises the following raw materials in parts by weight: 15-25 parts polyurethane resin, 5-8 parts flame retardant, 3-5 parts glass powder, 0.5-1 part compatibilizer, and 0.5-1 part dispersant.

[0029] Generally, the higher the refractory fiber content in a profile, the higher the density of the resulting fire-resistant barrier, leading to better fire protection. However, excessively high refractory fiber content places higher demands on the profile manufacturing process and the wetting performance of the polyurethane refractory resin. Furthermore, excessively high refractory fiber content reduces the amount of polyurethane refractory resin used, increasing the difficulty of co-extruding the polyurethane refractory prepreg with the steel lining, and ultimately reducing the bond strength between the polyurethane refractory layer and the steel lining.

[0030] Therefore, in this embodiment, by adjusting the ratio of polyurethane refractory resin to refractory fiber, the content of refractory fiber in the polyurethane refractory layer is controlled at 67-75%, which can form an effective fire barrier when exposed to fire. Furthermore, by adjusting the formulation of the polyurethane refractory resin, flame retardants, kaolin, and glass powder are added to improve the fire resistance and flame retardancy of the polyurethane refractory layer; simultaneously, compatibilizers and dispersants are added to improve the compatibility between the raw materials.

[0031] The polyurethane resin can be a material suitable for the pultrusion process, such as Elastocoat from BASF. ® C 6226 / 107 polyurethane resin.

[0032] Refractory fibers include one or more of glass fibers, carbon fibers, basalt fibers, and aluminosilicate fibers. Glass fibers, carbon fibers, basalt fibers, and aluminosilicate fibers, as inorganic fiber materials, possess excellent flame retardancy and heat resistance. For example, 4800Tex alkali-free continuous glass fibers can be used as glass fibers.

[0033] The flame retardant comprises magnesium dihydrogen phosphate and aluminum hydroxide in a weight ratio of 1:2-3. Aluminum hydroxide has excellent flame retardant and smoke-suppressing properties; it absorbs heat and releases water vapor during combustion, exhibiting flame-retardant and self-extinguishing effects. Magnesium dihydrogen phosphate not only has flame-retardant properties but also acts as a stabilizer to improve the stability of the polyurethane fire-resistant layer. In this embodiment, the combination of magnesium dihydrogen phosphate and aluminum hydroxide as a flame retardant has a synergistic effect, effectively improving the fire resistance performance of the fireproof window.

[0034] The compatibilizer comprises 3-aminopropyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane in a weight ratio of 1:1-3. In this embodiment, by adding the compatibilizer composed of 3-aminopropyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane, the surface bonding strength between the flame retardant, glass fiber, and polyurethane resin can be improved, thereby enhancing the overall mechanical properties of the fireproof window.

[0035] Dispersants can improve the uniformity of mixing between raw materials. For example, dispersants can be selected from BYK-163 or BYK-164.

[0036] Two-component rigid polyurethane foam materials can be selected for polyurethane foaming materials, such as two-component polyurethane foam materials from Juxin Chemical.

[0037] In one exemplary embodiment, the production process further includes, prior to co-extruding the steel liner with the polyurethane refractory resin: Apply an adhesion promoter to the surface of the steel liner; The tackifier comprises the following raw materials in parts by weight: 50-60 parts aluminum dihydrogen phosphate, 20-30 parts kaolin, 10-20 parts attapulgite, 10-20 parts silica fume, 3-8 parts polyvinyl alcohol, 3-5 parts sorbitol, 1-2 parts citric acid, and 150-160 parts water.

[0038] In order to improve the bonding strength between the polyurethane refractory layer and the steel lining, in addition to using a co-extrusion process, an adhesive can also be applied to the surface of the steel lining to improve the bonding strength between the polyurethane refractory layer and the steel lining at high temperatures, thus avoiding problems such as the failure of the connection between the polyurethane refractory layer and the steel lining at high temperatures.

[0039] The tackifier used in this embodiment is a high-temperature resistant tackifier. By adjusting the tackifier's formulation, the bonding strength between the polyurethane refractory layer and the steel lining at high temperatures can be effectively improved. Aluminum dihydrogen phosphate, as the matrix material of the tackifier, has excellent high-temperature resistance. Kaolin's main mineral component is kaolinite, and its main chemical components include SiO2 and Al2O3, exhibiting good fire resistance. Attapulgite, also known as palygorskite, has SiO2 and MgO as its main chemical components, possessing good heat resistance. Silica powder's main component is SiO2, offering advantages in temperature resistance and chemical stability. The compounding of kaolin, attapulgite, and silica powder forms a refractory mullite phase at high temperatures, further improving the high-temperature bonding performance of the tackifier and enhancing the fire resistance of the fireproof window. The combination of polyvinyl alcohol, sorbitol, and citric acid increases the tackifier's hardening temperature, which is beneficial for improving the bonding strength between the polyurethane refractory layer and the steel lining at high temperatures.

[0040] In one exemplary embodiment, the method for preparing the tackifier includes the following steps: Aluminum dihydrogen phosphate, kaolin, attapulgite, silica powder and water are mixed and stirred at 200-600 rpm for 10-20 minutes at 90-95℃ to obtain a mixture. Polyvinyl alcohol, sorbitol and citric acid are added to the mixture and stirred until homogeneous to obtain a thickener.

[0041] In this embodiment, aluminum dihydrogen phosphate, kaolin, attapulgite, silica powder and water are mixed first, and then polyethylene, sorbitol and citric acid are added, which can improve the uniformity of mixing between raw materials.

[0042] In one exemplary embodiment, the manufacturing process further includes, prior to applying the tackifier to the surface of the steel liner: The steel lining is preheated at a temperature of 120-140℃.

[0043] In this embodiment, the steel lining is preheated before co-extruding with the polyurethane refractory prepreg, which helps to improve the stability of the bond between the steel lining and the polyurethane refractory layer.

[0044] In one exemplary embodiment, the co-extrusion temperature is 150-160°C; the curing temperature for curing is 170-180°C; and the curing time is 20-30 min.

[0045] To more clearly explain the technical solution of this application, this application provides specific embodiments of the production process for ultra-low energy consumption polyurethane-coated steel fireproof windows.

[0046] Preparation Example Preparation Example 1: A polyurethane refractory resin was prepared by the following method: Take 15 kg of polyurethane resin, 5 kg of flame retardant, 3 kg of glass powder, 2 kg of kaolin, 0.5 kg of compatibilizer and 0.5 kg of dispersant, mix them evenly to obtain polyurethane refractory resin.

[0047] The flame retardant consists of magnesium dihydrogen phosphate and aluminum hydroxide in a weight ratio of 1:2; the compatibilizer consists of 3-aminopropyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane in a weight ratio of 1:1; and the dispersant is BYK-163.

[0048] Preparation Example 2: A polyurethane refractory resin was prepared by the following method: Take 20 kg of polyurethane resin, 6.5 kg of flame retardant, 4 kg of glass powder, 3 kg of kaolin, 0.8 kg of compatibilizer and 0.8 kg of dispersant, mix them evenly to obtain polyurethane refractory resin.

[0049] The flame retardant consists of magnesium dihydrogen phosphate and aluminum hydroxide in a weight ratio of 1:3; the compatibilizer consists of 3-aminopropyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane in a weight ratio of 1:2; and the dispersant is BYK-163.

[0050] Preparation Example 3: A polyurethane refractory resin was prepared by the following method: Take 25 kg of polyurethane resin, 8 kg of flame retardant, 5 kg of glass powder, 4 kg of kaolin, 1 kg of compatibilizer and 1 kg of dispersant, mix them evenly to obtain polyurethane refractory resin.

[0051] The flame retardant consists of magnesium dihydrogen phosphate and aluminum hydroxide in a weight ratio of 1:4; the compatibilizer consists of 3-aminopropyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane in a weight ratio of 1:3; and the dispersant is BYK-163.

[0052] Preparation Example 4: A thickener was prepared by the following method: Mix 50 kg aluminum dihydrogen phosphate, 20 kg kaolin, 10 kg attapulgite, 10 kg silica powder and 150 kg water, and stir at 200 rpm for 10 minutes at 90°C to obtain a mixture. Add 3 kg of polyvinyl alcohol, 3 kg of sorbitol and 1 kg of citric acid to the mixture, stir well to obtain a thickener.

[0053] Preparation Example 5: A thickener was prepared by the following method: Mix 55 kg aluminum dihydrogen phosphate, 25 kg kaolin, 15 kg attapulgite, 15 kg silica powder and 155 kg water, and stir at 400 rpm for 15 minutes at 92°C to obtain a mixture. Add 5 kg of polyvinyl alcohol, 4 kg of sorbitol and 1.5 kg of citric acid to the mixture, stir well to obtain a thickener.

[0054] Preparation Example 6: A thickener was prepared by the following method: Mix 60 kg of aluminum dihydrogen phosphate, 30 kg of kaolin, 20 kg of attapulgite, 20 kg of silica powder and 160 kg of water, and stir at 600 rpm for 20 minutes at 95°C to obtain a mixture. Add 8 kg of polyvinyl alcohol, 5 kg of sorbitol and 2 kg of citric acid to the mixture, stir well to obtain a thickener. Example

[0055] Example 1: A manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window, comprising the following steps: (1) Polyurethane refractory resin is impregnated with refractory fiber to obtain polyurethane refractory prepreg; wherein the refractory fiber is glass fiber, the weight ratio of polyurethane refractory resin to continuous glass fiber is 1:2, and the polyurethane refractory resin is prepared by preparation example 1.

[0056] (2) The steel lining is preheated to 120°C, and then a 2mm thick tackifier is applied to the surface of the steel lining to obtain a pretreated steel lining. The pretreated steel lining and polyurethane refractory prepreg are extruded through a co-extrusion die, so that the polyurethane refractory prepreg adheres to the outer surface of the pretreated steel lining. The prepreg is cured at 170°C for 20 minutes to set the shape, forming a prefabricated profile with an internal steel lining. The tackifier was prepared in Preparation Example 4.

[0057] (3) Inject polyurethane foam into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile, thereby obtaining window frame profile and window sash profile.

[0058] (4) Assemble the window frame profile, window sash profile and fireproof glass to obtain an ultra-low energy consumption polyurethane-coated steel fireproof window.

[0059] Example 2: A manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window, comprising the following steps: (1) Polyurethane refractory resin is impregnated with refractory fiber to obtain polyurethane refractory prepreg; wherein the refractory fiber is glass fiber, the weight ratio of polyurethane refractory resin to continuous glass fiber is 1:2.5, and the polyurethane refractory resin is prepared by preparation example 2.

[0060] (2) The steel lining is preheated to 130°C, and then a 2mm thick tackifier is applied to the surface of the steel lining to obtain a pretreated steel lining. The pretreated steel lining and polyurethane refractory prepreg are extruded through a co-extrusion die, so that the polyurethane refractory prepreg adheres to the outer surface of the pretreated steel lining. The prepreg is cured at 175°C for 25 minutes to set the shape, forming a prefabricated profile with an internal steel lining. The tackifier was prepared in Preparation Example 5.

[0061] (3) Inject polyurethane foam into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile, thereby obtaining window frame profile and window sash profile.

[0062] (4) Assemble the window frame profile, window sash profile and fireproof glass to obtain an ultra-low energy consumption polyurethane-coated steel fireproof window.

[0063] Example 3: A manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window, comprising the following steps: (1) Polyurethane refractory resin is impregnated with refractory fiber to obtain polyurethane refractory prepreg; wherein the refractory fiber is glass fiber, the weight ratio of polyurethane refractory resin to continuous glass fiber is 1:3, and the polyurethane refractory resin is prepared by preparation example 1.

[0064] (2) The steel lining is preheated to 140°C, and then a 2mm thick tackifier is applied to the surface of the steel lining to obtain a pretreated steel lining. The pretreated steel lining and polyurethane refractory prepreg are extruded through a co-extrusion die, so that the polyurethane refractory prepreg adheres to the outer surface of the pretreated steel lining. The prepreg is cured at 180°C for 30 minutes to set the shape, forming a prefabricated profile with an internal steel lining. The tackifier was prepared in Preparation Example 6.

[0065] (3) Inject polyurethane foam into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile, thereby obtaining window frame profile and window sash profile.

[0066] (4) Assemble the window frame profile, window sash profile and fireproof glass to obtain an ultra-low energy consumption polyurethane-coated steel fireproof window.

[0067] Example 4: The difference between this example and Example 1 is that the weight ratio of polyurethane refractory resin to continuous glass fiber is 1:1.

[0068] Example 5: The difference between this example and Example 1 is that the weight ratio of polyurethane refractory resin to continuous glass fiber is 1:4.

[0069] Example 6: A manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window, comprising the following steps: (1) Polyurethane refractory resin is impregnated with refractory fiber to obtain polyurethane refractory prepreg; wherein the refractory fiber is glass fiber, the weight ratio of polyurethane refractory resin to continuous glass fiber is 1:4, and the polyurethane refractory resin is prepared by Preparation Example 1.

[0070] (2) Preheat the steel lining to 120°C to obtain a pretreated steel lining; extrude the pretreated steel lining and polyurethane refractory prepreg through a co-extrusion die to attach the polyurethane refractory prepreg to the outer surface of the pretreated steel lining, and cure it at 170°C for 20 minutes to set the shape, forming a prefabricated profile with a steel lining inside.

[0071] (3) Inject polyurethane foam into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile, thereby obtaining window frame profile and window sash profile.

[0072] (4) Assemble the window frame profile, window sash profile and fireproof glass to obtain an ultra-low energy consumption polyurethane-coated steel fireproof window.

[0073] Performance testing Fire-resistant window specimens were prepared using the methods described in the examples, and their performance was tested in accordance with GB / T12513-2006 "Test Method for Fire Resistance of Glass-Inlaid Components".

[0074] The outdoor side of the fireproof window is designated as the fire-exposed side, and the indoor side is designated as the fire-resistant side. During the first 5 minutes of the fire resistance test, the pressure inside the test furnace is (15±5) Pa. After 10 minutes, the pressure is adjusted to (17±3) Pa to test the fire resistance integrity of the fireproof window specimen.

[0075] The criteria for determining whether a component has lost its fire resistance integrity are as follows: ① When the flame spreads across the unexposed surface of the specimen for more than 10 seconds, the specimen is considered to have lost its fire resistance integrity; ② When a gap appears on the unexposed surface of the specimen that extends into the test furnace, and a probe with a diameter of (6±0.1) mm can pass through the gap and enter the test furnace and the probe can move at least 150 mm along the length of the gap, or a probe with a diameter of (25±0.2) mm can pass through the gap and enter the test furnace, the specimen is considered to have lost its fire resistance integrity.

[0076] According to GB 16809-2008 "Fireproof Windows", the fire resistance performance classification and designation of insulated fireproof windows (A) are as follows: Fire resistance and insulation ≥ 0.50h, and fire resistance integrity ≥ 0.50h, then the fire resistance rating designation is A0.50 (Class C). Fire resistance and insulation ≥ 1.00h, and fire resistance integrity ≥ 1.00h, then the fire resistance rating designation is A1.00 (Class B). Fire resistance and insulation ≥ 1.50h, and fire resistance integrity ≥ 1.50h, then the fire resistance rating designation is A1.50 (Class A). Fire resistance and insulation ≥ 2.00h, and fire resistance integrity ≥ 2.00h, then the fire resistance rating designation is A2.00. Fire resistance and insulation ≥ 3.00h, and fire resistance integrity ≥ 3.00h, then the fire resistance rating designation is A3.00.

[0077] As can be seen from Examples 1-5, the fire-resistant windows prepared using the method of this application meet the performance requirement of a fire resistance integrity of not less than 1.0h, demonstrating excellent fire resistance performance. Furthermore, the fire-resistant windows in Examples 1-3 exhibit a fire resistance integrity of not less than 2.0h, indicating that the fire-resistant windows produced using Examples 1-3 possess superior fire resistance performance.

[0078] As can be seen from Examples 1 and 4-6, the fire-resistant window specimen of Example 1 exhibits better fire resistance than those of Examples 4 and 6. This indicates that the glass fiber content in the polyurethane fire-resistant layer has a significant impact on the fire resistance performance of the fire-resistant window. When the glass fiber content is less than 67%, the density of the fire-resistant barrier formed is relatively low, leading to a decrease in the fire resistance performance of the window. Conversely, when the glass fiber content is greater than 75%, the low content of polyurethane refractory resin in the polyurethane fire-resistant layer results in a decrease in the bonding strength between the polyurethane fire-resistant layer and the steel lining. Especially when the steel lining is not treated with an adhesive, it is prone to separation from the polyurethane fire-resistant layer upon exposure to fire. The steel lining cannot effectively support the polyurethane fire-resistant layer, making it difficult for the polyurethane fire-resistant layer to maintain its fire-resistant function, thus reducing the fire resistance integrity of the fire-resistant window.

[0079] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A manufacturing process for an ultra-low energy consumption polyurethane-coated steel fireproof window, characterized in that, Includes the following steps: Polyurethane refractory resin is impregnated with refractory fibers to obtain polyurethane refractory prepreg; The steel lining and the polyurethane refractory prepreg are extruded through a co-extrusion die, so that the polyurethane refractory prepreg is attached to the outer surface of the steel lining. After curing and shaping, a prefabricated profile with an internal steel lining is formed. Polyurethane foam is injected into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile, thereby obtaining window frame profile and window sash profile. The window frame profile, the window sash profile, and the fireproof glass are assembled to obtain the ultra-low energy consumption polyurethane-coated steel fireproof window. The weight ratio of the polyurethane refractory resin to the refractory fiber is 1:2-4; The polyurethane refractory resin comprises the following raw materials in parts by weight: 15-25 parts polyurethane resin, 5-8 parts flame retardant, 3-5 parts glass powder, 2-4 parts kaolin, 0.5-1 part compatibilizer, and 0.5-1 part dispersant. Prior to co-extruding the steel lining with the polyurethane refractory resin, the production process further includes: Apply an adhesion promoter to the surface of the steel liner; The thickener comprises the following raw materials in parts by weight: 50-60 parts aluminum dihydrogen phosphate, 20-30 parts kaolin, 10-20 parts attapulgite, 10-20 parts silica fume, 3-8 parts polyvinyl alcohol, 3-5 parts sorbitol, 1-2 parts citric acid, and 150-160 parts water. Before applying the tackifier to the surface of the steel liner, the manufacturing process further includes: The steel lining is preheated at a temperature of 120-140°C. The co-extrusion temperature is 150-160℃; the curing temperature for curing is 170-180℃, and the curing time is 20-30 minutes.

2. The manufacturing process of the ultra-low energy consumption polyurethane-clad steel fireproof window according to claim 1, characterized in that, The refractory fiber includes one or more of glass fiber, carbon fiber, basalt fiber, and aluminosilicate fiber.

3. The manufacturing process of the ultra-low energy consumption polyurethane-coated steel fireproof window according to claim 1, characterized in that, The compatibilizer comprises 3-aminopropyltriethoxysilane and 3-(2-aminoethylamino)propyltrimethoxysilane in a weight ratio of 1:1-3.

4. The manufacturing process of the ultra-low energy consumption polyurethane-coated steel fireproof window according to claim 1, characterized in that, The flame retardant comprises magnesium dihydrogen phosphate and aluminum hydroxide in a weight ratio of 1:2-3.

5. The manufacturing process of the ultra-low energy consumption polyurethane-clad steel fireproof window according to claim 1, characterized in that, The preparation method of the thickener includes the following steps: Aluminum dihydrogen phosphate, kaolin, attapulgite, silica powder and water are mixed and stirred at 200-600 rpm for 10-20 minutes at 90-95℃ to obtain a mixture. Polyvinyl alcohol, sorbitol and citric acid are added to the mixture and stirred until homogeneous to obtain a thickener.

6. A low-energy-consumption polyurethane-coated steel fireproof window, characterized in that, It is produced using the production process described in any one of claims 1-5.