Polyurethane steel-clad fireproof window and production process thereof

Abstract

The invention relates to the technical field of door and window profiles, in particular to a polyurethane steel-clad fireproof window and a production process thereof. A polyurethane steel-clad fireproof window comprises a prefabricated profile, a heat insulation layer and fireproof glass. The prefabricated profile comprises a steel lining and a polyurethane outer layer; the polyurethane outer layer comprises a component A and a component B in a weight ratio of 1: (1.1-1.4); the component A is prepared from the following raw materials in parts by weight: 50 to 80 parts of polyol, 10 to 20 parts of glass fiber, 0.2 to 0.5 part of a coupling agent, 0.1 to 0.2 part of a toughening agent and 1 to 2 parts of an anti-aging agent; the component B is isocyanate; the anti-aging agent is a microcapsule anti-aging agent obtained by taking an organic anti-aging agent as a core material and mixing polymethyl methacrylate with an inorganic anti-aging agent as a wall material. The tensile strength aging retention rate of the obtained polyurethane material can reach 95.5-99.5%, and the breaking strength aging retention rate of the obtained polyurethane material can reach 96.1-99.8%.

Description

Technical Field

[0001] This application relates to the technical field of door and window materials, and in particular to a polyurethane-clad steel fireproof window and its production process. Background Art

[0002] A polyurethane-clad steel fireproof window is a fireproof window with various excellent properties. It uses a steel lining as the support skeleton and is wrapped with polyurethane material on the outside. The polyurethane material usually infiltrates refractory fibers to form a polyurethane refractory prepreg attached to the outer surface of the steel lining, and polyurethane foam is also injected into the inner side wall of the prefabricated profile to form a heat insulation layer. The steel lining has high strength and certain fire resistance, and can maintain structural stability in a fire.

[0003] The polyurethane-clad steel fireproof window has the following advantages: it can meet the performance requirement that the fire resistance integrity is not less than 1.0 h, and can effectively prevent the spread of fire and heat transfer within a certain period of time; polyurethane itself is an excellent heat insulation material with a low thermal conductivity, which can effectively reduce heat conduction and reduce building energy consumption; the steel lining provides strong support, and the polyurethane material also has a certain strength, enabling the fireproof window to withstand greater wind and pressure.

[0004] Although the polyurethane-clad steel fireproof window has many advantages, the polyurethane material has relatively poor anti-aging performance and cannot be exposed to ultraviolet light for a long time. If the polyurethane-clad steel fireproof window is directly applied to the outer window and exposed to sunlight for a long time, there will be great potential hazards, and phenomena such as discoloration, powdering, and embrittlement may occur, affecting the appearance and performance of the doors and windows. Summary of the Invention

[0005] In order to improve the anti-photoaging performance of polyurethane energy-saving door and window profiles, this application provides a polyurethane energy-saving door and window profile and its preparation method.

[0006] In the first aspect, this application provides a polyurethane-clad steel fireproof window, adopting the following technical solutions.

[0007] A polyurethane-clad steel fireproof window includes a prefabricated profile, a heat insulation layer, and fireproof glass; the prefabricated profile includes a steel lining and a polyurethane outer layer; it is characterized in that The polyurethane outer layer includes component A and component B with a weight ratio of 1:(1.1 - 1.4); Component A includes the following raw materials in parts by weight: 50 - 80 parts of polyol, 10 - 20 parts of glass fiber, 0.2 - 0.5 parts of coupling agent, 0.1 - 0.2 parts of toughening agent, 1 - 2 parts of anti-aging agent; Component B is isocyanate; The anti-aging agent is a microcapsule anti-aging agent obtained by using an organic anti-aging agent as the core material and polymethyl methacrylate mixed with an inorganic anti-aging agent as the wall material.

[0008] By adopting the above technical solution, an organic anti-aging agent is used as the core material, and a mixture of polymethyl methacrylate and an inorganic anti-aging agent is used as the wall material. The obtained microcapsule anti-aging agent is added to the polyurethane energy-saving door and window profile material. In the anti-aging process, the organic anti-aging agent volatilizes and migrates as the solvent, and the inorganic anti-aging agent has a long-lasting effect, but its immediate effect is relatively weaker than that of the organic anti-aging agent. Through design, the organic anti-aging agent is set inside the microcapsule, and the inorganic anti-aging agent is set in the microcapsule wall material. Under long-term ultraviolet irradiation, the inorganic anti-aging agent in the microcapsule wall material is first affected by ultraviolet rays and undergoes anti-aging first, and then the organic anti-aging agent in the microcapsule undergoes anti-aging. In addition, the organic anti-aging agent in the microcapsule will also slowly release to the outside of the microcapsule for anti-aging. That is, it slows down the volatilization and migration of the organic anti-aging agent, improves the durability of the anti-aging effect, and makes up for the disadvantage of the poor immediate effect of the inorganic anti-aging agent. At the same time, the inorganic anti-aging agent is embedded in the microcapsule wall material, improving the binding property of the inorganic anti-aging agent and the polyurethane material and ensuring the mechanical properties of the door and window profiles.

[0009] Furthermore, the organic anti-aging agent is a mixture of a UV absorber and an antioxidant with a weight ratio of (3 - 5):1.

[0010] By adopting the above technical solution, the UV absorber can absorb the energy of ultraviolet rays, and then through the intramolecular proton transfer process, convert the energy of ultraviolet rays into heat energy and release it, thereby avoiding photochemical damage to the polyurethane material caused by ultraviolet rays. The antioxidant can capture free radicals, especially the alkyl free radicals and peroxy free radicals generated during the photooxidation process, interrupt the free radical chain reaction of photooxidation, and effectively delay the photoaging process of the polyurethane material. The two are compounded and interact with each other to improve the anti-aging effect.

[0011] Furthermore, the inorganic anti-aging agent is a mixture of nano-titanium dioxide and hydrotalcite with a weight ratio of (4 - 6):1.

[0012] By adopting the above technical solution, when ultraviolet rays irradiate nano-titanium dioxide, its electronic structure undergoes a transition, generating electron-hole pairs, which can absorb the energy of ultraviolet rays. At the same time, the nano-titanium dioxide has a small particle size and has a scattering and reflection effect on ultraviolet rays, which can effectively prevent ultraviolet rays from penetrating the polyurethane material. Hydrotalcite is a layered double hydroxide, and this structure endows it with good anion exchangeability and adsorption properties. In terms of anti-aging, hydrotalcite can adsorb acidic products generated during the photooxidation process of the polyurethane material, such as carboxylic acids, etc., thereby inhibiting the further aging reaction catalyzed by acids. At the same time, it can also absorb ultraviolet rays and reduce the damage of ultraviolet rays to the material. The two are compounded and interact with each other to improve the anti-aging effect.

[0013] Furthermore, the preparation method of the microcapsule anti-aging agent is as follows: 1) Dissolve the organic anti-aging agent in a solvent to obtain a core material solution; 2) Dissolve the emulsifier in water to obtain an aqueous emulsifier solution; 3) Disperse the inorganic anti-aging agent in methyl methacrylate monomer to obtain a suspension; 4) Add the core material solution to the aqueous emulsifier solution, and then add the suspension while stirring to obtain an emulsion system; 5) Add an initiator to the emulsion system, and then heat the system to 60 - 80 °C for polymerization reaction, and the reaction time is 3 - 6 h; 6) After the reaction, centrifuge, wash, and dry to obtain the microcapsule anti-aging agent.

[0014] By adopting the above technical solution, under the action of the emulsifier and the initiator, the methyl methacrylate monomer undergoes a polymerization reaction to form a wall material, which wraps the organic anti-aging agent. At the same time, due to the mixing of the inorganic anti-aging agent and the methyl methacrylate monomer, during the polymerization process, the inorganic anti-aging agent is embedded in the formed capsule wall material.

[0015] Furthermore, the weight ratio of the inorganic anti-aging agent to the methyl methacrylate monomer is 1:(20 - 30).

[0016] Furthermore, in step 4), add the core material solution to the aqueous emulsifier solution, and then add the suspension while stirring at a rotation speed of 2000 - 2500 r / min to obtain an emulsion system.

[0017] Furthermore, the weight ratio of the organic anti-aging agent to the methyl methacrylate monomer is 1:(5 - 10).

[0018] Furthermore, the particle size of the nano-titanium dioxide is 20 - 40 nm, and the particle size of the hydrotalcite is 30 - 50 μm.

[0019] Furthermore, the inorganic anti-aging agent is a modified inorganic anti-aging agent, and its preparation method is as follows: Disperse the inorganic anti-aging agent in ethanol, add γ-aminopropyltriethoxysilane, and ultrasonically mix at 60 - 80 °C for 30 - 40 min. After the reaction, centrifuge and dry to obtain the modified inorganic anti-aging agent; The weight ratio of γ-aminopropyltriethoxysilane to the inorganic anti-aging agent is 1:(10 - 12).

[0020] By adopting the above technical solution, the inorganic anti-aging agent is modified to improve the interfacial bonding performance between the inorganic anti-aging agent and the microcapsule wall material.

[0021] In the second aspect, the present application provides a production process for a polyurethane-clad steel fire window, adopting the following technical solution.

[0022] A production process of a polyurethane steel-clad fireproof window, comprising the following steps: S1. Prepare polyurethane fireproof prepreg Mix glass fiber, coupling agent and toughening agent, and grind to obtain a mixture; Mix the mixture, anti-aging agent and polyol to obtain component A; Mix component A and component B to obtain polyurethane fireproof prepreg; S2. Make prefabricated profiles Steel lining treatment: Preheat the steel lining, control the preheating temperature at 120 - 140 °C, and then apply a tackifier on the surface of the steel lining; Co-extrusion molding: Extrude the treated steel lining and polyurethane fireproof prepreg through a co-extrusion die head, control the co-extrusion temperature at 150 - 160 °C, so that the polyurethane fireproof prepreg adheres to the outer surface of the steel lining, and then through curing and shaping, the curing temperature is 170 - 180 °C, and the curing time is 20 - 30 min, to form a prefabricated profile with a steel lining inside; S3. Form a heat insulation layer Inject polyurethane foaming material into the inner side wall of the prefabricated profile to form a heat insulation layer on the inner side wall of the prefabricated profile, and obtain window frame profiles and window sash profiles; S4. Assemble the fireproof window Assemble the window frame profiles, window sash profiles, fireproof glass, flame retardant rubber strips, fireproof hardware and other auxiliary accessories, and fix each component by cutting, welding, screwing, etc., and finally obtain a polyurethane steel-clad fireproof window.

[0023] In summary, the present application has the following beneficial effects: Using an organic anti-aging agent as the core material and polymethyl methacrylate mixed with an inorganic anti-aging agent as the wall material, the obtained microcapsule anti-aging agent is added to the profile material of the polyurethane steel-clad fireproof window. Through design, the organic anti-aging agent is arranged inside the microcapsule, and the inorganic anti-aging agent is arranged in the microcapsule wall material. Under long-term ultraviolet irradiation, the inorganic anti-aging agent in the microcapsule wall material is first affected by ultraviolet rays and first undergoes anti-aging, and then the organic anti-aging agent in the microcapsule undergoes anti-aging. In addition, the organic anti-aging agent in the microcapsule will also slowly release to the outside of the microcapsule for anti-aging. That is, it slows down the volatilization and migration of the organic anti-aging agent, improves the persistence of the anti-aging effect, and makes up for the disadvantage of the poor immediate effect of the inorganic anti-aging agent. At the same time, the inorganic anti-aging agent is embedded in the microcapsule wall material, improving the binding property of the inorganic anti-aging agent and the polyurethane material, and ensuring the mechanical properties of the door and window profiles. The tensile strength aging retention rate of the polyurethane material can reach 95.5 - 99.5%, and the breaking strength aging retention rate can reach 96.1 - 99.8%. Specific embodiments

[0024] The present application will be further described in detail below in conjunction with embodiments.

[0025] Preparation Examples of Raw Materials and Intermediates Raw Materials Polyol, a mixture of 1,2 - propanediol and ethylene glycol with a weight ratio of 1:2; Glass fiber, with a diameter of 10 μm and a length of 5 cm; Coupling agent, titanate coupling agent; Toughening agent, methyl methacrylate - butadiene - styrene terpolymer; Isocyanate, diphenylmethane diisocyanate Ultraviolet absorber, 2-(2’-hydroxy - 5’-methylphenyl) benzotriazole; Antioxidant, 1010; Emulsifier, sodium dodecyl sulfate; Initiator, potassium persulfate; The tackifier is made of 55 parts of aluminum dihydrogen phosphate, 25 parts of kaolin, 15 parts of attapulgite, 15 parts of silica powder, 5 parts of polyvinyl alcohol, 4 parts of sorbitol, 2 parts of citric acid, and 155 parts of water.

[0026] Preparation Examples Preparation Example 1 A modified inorganic anti - aging agent, and its preparation method is as follows: Disperse the inorganic anti - aging agent in ethanol, add γ - aminopropyltriethoxysilane, the weight ratio of γ - aminopropyltriethoxysilane to the inorganic anti - aging agent is 1:10, ultrasonically mix at 70 °C for 35 min, centrifuge after the reaction ends, and then dry to constant weight at 65 °C to obtain the modified inorganic anti - aging agent.

[0027] Preparation Example 2 A micro - capsule anti - aging agent, and its preparation method is as follows 1) Dissolve 3 kg of ultraviolet absorber and 1 kg of antioxidant in toluene solvent to obtain a core material solution; 2) Dissolve 0.8 kg of emulsifier in deionized water to obtain an emulsifier aqueous solution; 3) Disperse 0.8 kg of nano - titanium dioxide and 0.2 kg of hydrotalcite in 30 kg of methyl methacrylate monomer to obtain a suspension; the particle size of the nano - titanium dioxide is 30 nm, and the particle size of the hydrotalcite is 40 μm; 4) Add the core material solution to the emulsifier aqueous solution, and then add the suspension while stirring at a speed of 2300 r / min to obtain an emulsion system; 5) Add 0.2 kg of initiator to the emulsion system, and then heat the system to 70 °C for polymerization reaction, and the reaction time is 5 h; 6) After the reaction, centrifuge and wash three times with deionized water, then dry at 45 °C to obtain the microcapsule anti-aging agent.

[0028] Preparation Example 3 Different from Preparation Example 2, in Preparation Example 3, the weight ratio of the ultraviolet absorber to the antioxidant is 5:1, and the sum of the weights of the ultraviolet absorber and the antioxidant is 4 kg.

[0029] Preparation Example 4 Different from Preparation Example 2, in Preparation Example 4, the weight ratio of the ultraviolet absorber to the antioxidant is 1:3, and the sum of the weights of the ultraviolet absorber and the antioxidant is 4 kg.

[0030] Preparation Example 5 Different from Preparation Example 2, in Preparation Example 5, the weight ratio of nano-titanium dioxide to hydrotalcite is 5:1, and the sum of the weights of nano-titanium dioxide and hydrotalcite is 1 kg.

[0031] Preparation Example 6 Different from Preparation Example 2, in Preparation Example 5, the weight ratio of nano-titanium dioxide to hydrotalcite is 6:1, and the sum of the weights of nano-titanium dioxide and hydrotalcite is 1 kg.

[0032] Preparation Example 7 Different from Preparation Example 2, in Preparation Example 7, the weight ratio of nano-titanium dioxide to hydrotalcite is 1:5, and the sum of the weights of nano-titanium dioxide and hydrotalcite is 1 kg.

[0033] Preparation Example 8 Different from Preparation Example 2, in Preparation Example 8, the methyl methacrylate monomer is 30 kg, and the weight ratio of the sum of the weights of nano-titanium dioxide and hydrotalcite to the methyl methacrylate monomer is 1:20.

[0034] Preparation Example 9 Different from Preparation Example 2, in Preparation Example 9, the methyl methacrylate monomer is 30 kg, and the weight ratio of the sum of the weights of nano-titanium dioxide and hydrotalcite to the methyl methacrylate monomer is 1:15.

[0035] Preparation Example 10 Different from Preparation Example 2, in Preparation Example 10, the methyl methacrylate monomer is 30 kg, and the weight ratio of the sum of the weights of the ultraviolet absorber and the antioxidant to the methyl methacrylate monomer is 1:5.

[0036] Preparation Example 11 Different from Preparation Example 2, in Preparation Example 11, the methyl methacrylate monomer is 30 kg, and the weight ratio of the sum of the weights of the ultraviolet absorber and the antioxidant to the methyl methacrylate monomer is 1:15.

[0037] Preparation Example 12 Different from Preparation Example 2, the nano-titanium dioxide and hydrotalcite in Preparation Example 12 were modified according to the method in Preparation Example 1.

[0038] Preparation Example 13 A microcapsule anti-aging agent, and its preparation method is 1) Dissolve 3 kg of ultraviolet absorber and 1 kg of antioxidant in toluene solvent to obtain a core material solution; 2) Dissolve 0.8 kg of emulsifier in deionized water to obtain an emulsifier aqueous solution; 3) Add the core material solution to the emulsifier aqueous solution, and then add 30 kg of methyl methacrylate monomer while stirring at a speed of 2300 r / min to obtain an emulsion system; 4) Add 0.2 kg of initiator to the emulsion system, and then heat the system to 70 °C for polymerization reaction, and the reaction time is 5 h; 5) After the reaction, centrifuge, wash 3 times with deionized water, and dry at 45 °C to obtain the microcapsule anti-aging agent. Examples

[0039] Examples 1-3 A polyurethane-clad steel fire window, and its production process is: S1. Prepare polyurethane fire-resistant prepreg According to the ratio in Table 1, mix glass fiber, coupling agent, and toughening agent, and grind to obtain a mixture; Mix the mixture, anti-aging agent, and polyol to obtain Component A; Mix Component A and Component B to obtain the polyurethane fire-resistant prepreg; S2. Make prefabricated profiles Steel lining treatment: Preheat the steel lining, control the preheating temperature at 130 °C, and then apply a tackifier on the surface of the steel lining; Co-extrusion molding: Extrude the treated steel lining and the polyurethane fire-resistant prepreg through a co-extrusion die head, control the co-extrusion temperature at 1550 °C, make the polyurethane fire-resistant prepreg adhere to the outer surface of the steel lining, and then go through curing and shaping, the curing temperature is 175 °C, and the curing time is 25 min to form a prefabricated profile with a steel lining inside; S3. Form a heat insulation layer Inject polyurethane foaming material into the inner side wall of the prefabricated profile to form a heat insulation layer on the inner side wall of the prefabricated profile to obtain a window frame profile and a window sash profile; S4. Assemble the fire window Assemble the window frame profile, window sash profile, fireproof glass, flame retardant rubber strip, fireproof hardware and other auxiliary accessories, and fix each component by cutting, welding, screwing, etc., and finally obtain the polyurethane-clad steel fire window.

[0040] Table 1 Raw material ratio table of Examples 1-3

[0041] Among them, the anti-aging agent is the microcapsule anti-aging agent from Preparation Example 2.

[0042] Examples 4-13 Different from Example 2, the microcapsule anti-aging agents in Examples 4-13 are respectively from Preparation Examples 3-12.

[0043] Comparative Examples Comparative Example 1 Different from Example 1, the anti-aging agent in Comparative Example 1 is a microcapsule anti-aging agent from Preparation Example 13 and an inorganic anti-aging agent with a weight ratio of 4:1, where the inorganic anti-aging agent is nano-titanium dioxide and hydrotalcite with a weight ratio of 4:1.

[0044] Comparative Example 2 Different from Example 1, the anti-aging agent in Comparative Example 2 is an organic anti-aging agent and an inorganic anti-aging agent with a weight ratio of 4:1, where the organic anti-aging agent is an ultraviolet absorber and an antioxidant with a weight ratio of 3:1, and the inorganic anti-aging agent is nano-titanium dioxide and hydrotalcite with a weight ratio of 4:1.

[0045] Performance detection The tensile strength and elongation at break of the polyurethane materials obtained in the examples and comparative examples were tested. Then, referring to "Test Method for Exposure of Plastics to Laboratory Light Sources - Part 3: Fluorescent Ultraviolet Lamps" GB-T 16422.3-2022, the materials were aged using a combination of four ultraviolet lamps. After 15 days of aging treatment, the tensile strength and elongation at break were tested again; Calculate the aging retention rate: Tensile strength aging retention rate = tensile strength after aging / tensile strength before aging × 100%; Elongation at break aging retention rate = elongation at break after aging / elongation at break before aging × 100%; The results are shown in Table 2.

[0046] Table 2 Performance detection results

[0047] Combining Examples 1-13 and Comparative Examples 1-2, and combining with Table 2, it can be seen that the tensile strength aging retention rate and elongation at break aging retention rate of the materials obtained in Examples 1-13 are better than those of Comparative Examples 1-2, which indicates that the materials obtained in this application have better anti-photoaging performance.

[0048] Combining Example 1 with Comparative Examples 1-2 and referring to Table 2, it can be seen that the ratios of the organic anti-aging agent to the inorganic anti-aging agent in Example 1 and Comparative Examples 1-2 are the same. However, in Example 1, the organic anti-aging agent is encapsulated in the microcapsules, and the inorganic anti-aging agent is embedded in the microcapsule wall material; in Comparative Example 1, only the organic anti-aging agent is microencapsulated, and in Comparative Example 2, no treatment is carried out. As a result, the tensile strength aging retention rate and the breaking strength aging retention rate of the materials obtained in Example 1 are significantly better than those in Comparative Examples 1-2, and the tensile strength aging retention rate and the breaking strength aging retention rate of the materials obtained in Comparative Example 1 are significantly better than those in Comparative Example 2. This shows that encapsulating the organic anti-aging agent in the microcapsules and embedding the inorganic anti-aging agent in the microcapsule wall material can improve the anti-photoaging performance of the polyurethane material. This may be because under long-term ultraviolet irradiation, the inorganic anti-aging agent in the microcapsule wall material is first affected by ultraviolet rays and undergoes anti-aging first, and then the organic anti-aging agent in the microcapsules undergoes anti-aging. In addition, the organic anti-aging agent in the microcapsules will also slowly release to the outside of the microcapsules to carry out anti-aging. That is, it slows down the volatilization and migration of the organic anti-aging agent, improves the persistence of the anti-aging effect, and makes up for the disadvantage of the poor immediate effect of the inorganic anti-aging agent. At the same time, the inorganic anti-aging agent is embedded in the microcapsule wall material, which improves the binding property between the inorganic anti-aging agent and the polyurethane material and ensures the mechanical properties of the door and window profiles.

[0049] Combining Example 2 with Examples 4-12 and referring to Table 2, it can be seen that the ratios of the raw materials in the microcapsule anti-aging agent will affect the anti-aging effect of the polyurethane material. Within the ratio range defined in this application, the anti-aging effect is better.

[0050] Combining Example 2 with Example 12 and referring to Table 2, it can be seen that the tensile strength aging retention rate and the breaking strength aging retention rate of the materials obtained in Example 12 are better than those in Example 2. This shows that modifying the inorganic filler with γ-aminopropyltriethoxysilane is beneficial to improving the anti-aging performance of the polyurethane material. This may be because modifying the inorganic filler with γ-aminopropyltriethoxysilane improves the interfacial bonding property between the inorganic anti-aging agent and the microcapsule wall material, and the inorganic filler will not easily separate from the microcapsule wall material during the aging process, affecting the tensile strength and breaking growth rate of the polyurethane material.

[0051] This specific embodiment is only an explanation of this application, and it is not a limitation of this application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of this application, it is protected by the patent law.

Claims

1. A polyurethane-clad steel fireproof window, comprising a prefabricated profile, a heat-insulating layer, and a fireproof glass; the prefabricated profile comprises a steel lining and a polyurethane outer layer; characterized in that: The polyurethane outer layer comprises component A and component B in a weight ratio of 1:(1.1-1.4); The component A comprises the following raw materials in parts by weight: 50-80 parts of polyol, 10-20 parts of glass fiber, 0.2-0.5 parts of coupling agent, 0.1-0.2 parts of toughening agent, and 1-2 parts of anti-aging agent; The B component is isocyanate; The anti-aging agent is a microcapsule anti-aging agent obtained by using an organic anti-aging agent as a core material and polymethyl methacrylate mixed with an inorganic anti-aging agent as a wall material.

2. A polyurethane-clad steel fireproof window according to claim 1, characterized in that: The organic anti-aging agent is a UV absorber and an antioxidant in a weight ratio of (3-5):

1.

3. The polyurethane-clad steel fireproof window according to claim 1, characterized in that: The inorganic anti-aging agent is nano titanium dioxide and hydrotalcite in a weight ratio of (4-6):

1.

4. The polyurethane-clad steel fireproof window according to claim 1, characterized in that: The preparation method of the microcapsule anti-aging agent is: 1) dissolving the organic antioxidant in a solvent to obtain a core material solution; 2) dissolving the emulsifier in water to obtain an emulsifier aqueous solution; 3) dispersing an inorganic antioxidant in methyl methacrylate monomer to obtain a suspension; 4) adding the core material solution to the emulsifier aqueous solution, and then adding the suspension while stirring to obtain an emulsion system; 5) Add initiator to the emulsion system, then heat the system to 60-80°C for polymerization, the reaction time is 3-6 hours; 6) After the reaction is completed, centrifuge, wash and dry to obtain the microcapsule anti-aging agent.

5. The polyurethane-clad steel fireproof window according to claim 4, characterized in that: The weight ratio of the inorganic anti-aging agent to the methyl methacrylate monomer is 1:(20-30).

6. The polyurethane-clad steel fireproof window according to claim 4, characterized in that: In the above 4), the core material solution is added to the emulsifier aqueous solution, and then the suspension is added while stirring at a speed of 2000-2500 r / min to obtain an emulsion system.

7. The polyurethane-clad steel fireproof window according to claim 4, characterized in that: The weight ratio of the organic anti-aging agent to the methyl methacrylate monomer is 1:(5-10).

8. The polyurethane-clad steel fireproof window according to claim 2, characterized in that: The particle size of the nano titanium dioxide is 20-40 nm, and the particle size of the hydrotalcite is 30-50 μm.

9. The polyurethane-clad steel fireproof window according to claim 4, characterized in that: The inorganic anti-aging agent is a modified inorganic anti-aging agent, and its preparation method is as follows: The inorganic anti-aging agent is dispersed in ethanol, γ-aminopropyltriethoxysilane is added, and ultrasonic mixing is performed at 60-80° C. for 30-40 minutes. After the reaction is completed, the mixture is centrifuged and dried to obtain a modified inorganic anti-aging agent. The weight ratio of the gamma-aminopropyltriethoxysilane to the inorganic anti-aging agent is 1:(10-12).

10. A production process for the polyurethane-clad steel fireproof window according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Preparation of polyurethane refractory prepreg The glass fiber, the coupling agent and the toughening agent are mixed and ground to obtain a mixture; The mixture, the anti-aging agent and the polyol are mixed to obtain component A; Mixing component A with component B to obtain a polyurethane fire-resistant prepreg; S2. Make prefabricated profiles Steel lining treatment: preheat the steel lining at a temperature of 120-140°C, and then apply a tackifier on the surface of the steel lining; Co-extrusion molding: The treated steel lining and polyurethane refractory prepreg are extruded through a co-extrusion die head. The co-extrusion temperature is controlled at 150-160°C, so that the polyurethane refractory prepreg adheres to the outer surface of the steel lining. After curing and shaping, the curing temperature is 170-180°C and the curing time is 20-30 minutes to form a prefabricated profile with a steel lining inside; S3. Forming a heat insulation layer Injecting polyurethane foam into the inner wall of the prefabricated profile to form a heat insulation layer on the inner wall of the prefabricated profile to obtain a window frame profile and a window sash profile; S4. Assemble fireproof windows The window frame profiles, window sash profiles, fireproof glass, flame-retardant rubber strips, fireproof hardware and other auxiliary accessories are assembled, and the components are fixed by cutting, welding, screwing, etc., to finally obtain the polyurethane-clad steel fireproof window.

Images