High-strength antioxidant polystyrene external wall panel

Abstract

The invention belongs to the technical field of external wall panels, and particularly relates to a high-strength antioxidant polystyrene external wall panel. The polystyrene external wall panel is prepared from the following raw material components in parts by weight: 70 to 80 parts of modified polystyrene, 0.2 to 0.4 part of silane coupling agent, 7 to 9 parts of expanded graphite, 1 to 3 parts of silicon dioxide aerogel, 0.5 to 1 part of flame retardant, 2 to 4 parts of foaming agent and 5 to 10 parts of reinforcing agent. The prepared high-strength antioxidant polystyrene external wall panel is good in mechanical property, not prone to damage and higher in safety, the tensile strength ranges from 0.72 Mpa to 0.81 Mpa, and the impact strength ranges from 17.3 KJ / m < 2 > to 18.2 KJ / m < 2 >; meanwhile, the heat preservation performance and the waterproof performance are excellent, the anti-oxidation effect is good, and the service life can be prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of exterior wall panels, and in particular relates to a high-strength anti-oxidation polystyrene exterior wall panel. Background Art

[0002] Polystyrene exterior wall panels are emerging building materials in recent years. Compared with traditional building materials, polystyrene exterior wall panels are lighter, easier to install, suitable for a variety of buildings, and easier to construct. Polystyrene exterior wall panels have low density and are lightweight materials. They are easy to carry and install, and can reduce the load of the building. Therefore, the use of polystyrene exterior wall panels can reduce the difficulty of construction workers and improve construction efficiency. In addition, polystyrene exterior wall panels have excellent waterproof and heat insulation properties, and can maintain their thermal insulation properties even in humid environments. At the same time, polystyrene exterior wall panels are inexpensive, so they are widely used in the field of building insulation.

[0003] However, polystyrene exterior wall panels have low mechanical strength and are easily damaged; and polystyrene is easily affected by ultraviolet rays and temperature, causing aging, and has a low service life when used in outdoor environments.

[0004] In the prior art, in order to improve the strength of the insulation layer of the polystyrene exterior wall panel, a reinforcing layer such as a glass fiber mesh is often provided. For example, in the patent number "CN03236890.9" and the name "Polystyrene High-Strength Composite Material Insulation Board", the reinforcing layer is bonded to the polystyrene exterior wall panel. However, there may be phenomena such as loose bonding, easy to fall off, and cracking of the surface layer, which affects the insulation effect and safety.

[0005] In order to improve the anti-oxidation effect of polystyrene exterior wallboards, antioxidants such as ultraviolet absorbers and free radical scavengers are usually added to polystyrene exterior wallboards to delay the aging process. However, the aging of polystyrene exterior wallboards is irreversible, and the strength of polystyrene exterior wallboards will drop significantly after aging, which poses a safety hazard. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a high-strength anti-oxidation polystyrene exterior wall board, which achieves the invention purpose of improving the strength and anti-oxidation performance of the polystyrene exterior wall board and prolonging its service life.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A high-strength anti-oxidation polystyrene exterior wall board. The raw materials of the polystyrene exterior wall board include the following components in parts by weight: 70-80 parts of modified polystyrene, 0.2-0.4 parts of silane coupling agent, 7-9 parts of expanded graphite, 1-3 parts of silica aerogel, 0.5-1 parts of flame retardant, 2-4 parts of foaming agent and 5-10 parts of reinforcing agent.

[0008] Preferably, the preparation method of the modified polystyrene is: S11, adding 2-allylphenol and a catalyst into a reaction kettle, heating to 80-90°C under nitrogen protection, then dropping epichlorohydrin and stirring to react for 4-5 hours, cooling to room temperature, adding sodium hydroxide solution and tetrabutylammonium bromide, and performing a ring-closure reaction at 35-40°C for 3-4 hours, and performing reduced pressure distillation, filtering and desalting to obtain an allyl epoxy monomer; S12. Add allyl epoxy monomer, styrene monomer and dispersant to an appropriate amount of ethanol and stir for 10 to 15 minutes, add initiator dibenzoyl peroxide, raise the temperature to 70 to 85°C and copolymerize for 5 to 7 hours, terminate the reaction with methanol, remove most of the ethanol by rotary evaporation, filter and wash with deionized water and ethanol in turn for multiple times, and obtain granular modified polystyrene containing epoxy groups after drying.

[0009] Preferably, the molar ratio of 2-allylphenol to epichlorohydrin in S11 is 4 to 7:1.

[0010] Preferably, the dripping rate of epichlorohydrin in S11 is 6-10 ml / min.

[0011] Preferably, the catalyst in S11 is zinc perchlorate and aluminum oxide, and the mass ratio of zinc perchlorate to aluminum oxide is 1 to 2:1.

[0012] Furthermore, the amount of the catalyst added in S11 is 0.01 to 0.1% of the mass of 2-allylphenol.

[0013] Preferably, the mass fraction of the sodium hydroxide solution in S11 is 25-35%, and the amount of the sodium hydroxide solution added is 80-95% of the mass of epichlorohydrin.

[0014] Preferably, the amount of tetrabutylammonium bromide added in S11 is 0.2-0.8% of the mass of epichlorohydrin.

[0015] Preferably, the mass ratio of the allyl epoxy monomer, the styrene monomer and the dispersant in S12 is 10-15:45-60:1-2.

[0016] Preferably, the dispersant in S12 is one or more of Tween80, Span20, and fatty alcohol polyoxyethylene ether.

[0017] Preferably, the amount of the initiator dibenzoyl peroxide added in S12 is 0.5 to 0.8% of the mass of the styrene monomer.

[0018] Preferably, the particle size range of the modified polystyrene in S12 is 3 to 4 mm.

[0019] Preferably, the preparation method of the enhancer is: placing benzofuran-6-carboxylic acid and maleimide in an appropriate amount of dimethylformamide and stirring for 20 to 30 minutes, heating to 60 to 70° C. and reacting for 1 to 2 hours, and after the reaction is completed, reducing pressure, concentrating, filtering, washing, and drying to obtain the enhancer.

[0020] Preferably, the molar ratio of the benzofuran-6-carboxylic acid to maleimide is 2.2-3.6:1.

[0021] Preferably, the preparation method of the high-strength anti-oxidation polystyrene exterior wallboard is: S21, adding expanded graphite and silica aerogel into a solid mixer, spraying the silane coupling agent solution, stirring evenly and drying to obtain a mixture A; S22, uniformly mixing the modified polystyrene, the flame retardant and the foaming agent to obtain a mixture B; S23, pre-foaming the mixture B, and then ripening it at room temperature for 12 hours; S24, mixing the matured mixed material B with the mixed material A and the reinforcing agent uniformly, and then drying and granulating to obtain external wall board particles; S25, the exterior wall panel particles are subjected to a steam compression molding process, and after demoulding, they are dried to obtain a high-strength, anti-oxidation polystyrene exterior wall panel.

[0022] Preferably, the size of the expanded graphite in S21 is 0.3-0.6 mm; the size of the silica aerogel is 0.2-1 mm Preferably, the concentration of the silane coupling agent solution in S21 is 1-3%, and the silane coupling agent is one or more of KH550 and KH792; the drying temperature is 70-80° C., and the drying time is 5-7 hours.

[0023] Preferably, the flame retardant in S22 is one or more of magnesium hydroxide, aluminum hydroxide, phosphorus-based flame retardant, etc.

[0024] Preferably, the pre-foaming temperature in S23 is 80-100° C. and the time is 3-5 min.

[0025] Preferably, the drying and granulation in S24 is carried out at a temperature of 70 to 80° C. and for a time of 20 to 30 minutes.

[0026] Preferably, the temperature of the steam compression molding in S25 is 110-120° C., and the pressure is 0.4-0.6 MPa.

[0027] Preferably, the drying temperature in S25 is 50-60° C. and the drying time is 24-48 hours.

[0028] Allyl epoxy monomer and styrene monomer are copolymerized under the action of an initiator to form a granular modified polystyrene containing epoxy groups, and a reinforcing agent containing Diels-Alder bonds is generated by the reaction of benzofuran-6-carboxylic acid and maleimide. At the same time, the expanded graphite and silica aerogel are surface-modified with an aminosilane coupling agent. During the compression molding process, the Diels-Alder bonds are broken by high temperature and pressure, the reinforcing agent is decomposed, and the epoxy groups in the modified polystyrene, the amino groups on the surface of the expanded graphite and silica aerogel in the mixture A react with the carboxyl groups and anhydride groups generated by the decomposition of the reinforcing agent to produce a cross-linked structure, thereby improving the strength of the exterior wallboard. In addition, the reinforcing agent contains conjugated double bonds, which can undergo double bond addition with the free radicals generated during the aging process. Therefore, the exterior wallboard has certain UV resistance and self-repairing ability, good antioxidant effect, and extended service life.

[0029] Due to the adoption of the above technical solution, the technical effects achieved by the present invention are: 1. The high-strength, anti-oxidation polystyrene exterior wall board prepared by the present invention has good mechanical properties, is not easy to break, and is safer. The tensile strength is 0.72-0.81Mpa (measured perpendicular to the board surface in accordance with GB / T 29906-2013 "Molded polystyrene board thin plastering exterior wall insulation system materials"), and the impact strength is 17.3-18.2KJ / m 2 (Determined in accordance with GB / T 1843-2008 "Izod beam impact strength of plastics").

[0030] 2. The high-strength, oxidation-resistant polystyrene exterior wall panels prepared by the present invention have both good thermal insulation and flame retardant properties, wherein the thermal conductivity (25°C) is 0.018-0.026 W / (m·K) (determined in accordance with GB / T 10294-2008 Determination of Steady-State Thermal Resistance and Related Properties of Insulating Materials - Protected Hot Plate Method); the oxygen index is 28.4-31.2 (determined in accordance with GB / T 2406-2022 Plastic Combustion Performance Test Method - Oxygen Index Method).

[0031] 3. The high-strength anti-oxidation polystyrene exterior wall panel prepared by the present invention has excellent anti-oxidation performance, a small decrease in mechanical strength after aging treatment, and higher safety performance.

[0032] 4. The high-strength, anti-oxidation polystyrene exterior wall panels prepared by the present invention have good waterproof effect and a water absorption rate of less than 4% (determined in accordance with "GB / T 1034-2008 Determination of Water Absorption of Plastics"). DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific embodiments.

[0034] Example 1: A high-strength, anti-oxidation polystyrene exterior wall panel. The raw materials of the polystyrene exterior wall panel include the following components in parts by weight: 75 parts of modified polystyrene, 0.3 parts of silane coupling agent, 8 parts of expanded graphite, 2 parts of silica aerogel, 0.8 parts of flame retardant, 3 parts of foaming agent, and 8 parts of reinforcing agent.

[0035] The preparation method of the modified polystyrene is: S11, adding 2-allylphenol and a catalyst into a reaction kettle, heating to 85°C under nitrogen protection, adding epichlorohydrin dropwise and stirring to react for 4.5 hours, cooling to room temperature, adding sodium hydroxide solution and tetrabutylammonium bromide, and carrying out a ring-closure reaction at 37°C for 3.5 hours, and performing reduced pressure distillation, filtering and desalting to obtain an allyl epoxy monomer; S12. Add allyl epoxy monomer, styrene monomer and dispersant to an appropriate amount of ethanol and stir for 15 minutes. Add initiator dibenzoyl peroxide, heat to 80°C and copolymerize for 6 hours. Terminate the reaction with methanol, remove most of the ethanol by rotary evaporation, filter and wash with deionized water and ethanol for multiple times, and obtain granular modified polystyrene containing epoxy groups after drying.

[0036] The molar ratio of 2-allylphenol to epichlorohydrin in S11 is 5.5:1.

[0037] The dripping rate of epichlorohydrin in S11 is 8 ml / min.

[0038] The catalyst in S11 is zinc perchlorate and aluminum oxide, and the mass ratio of zinc perchlorate to aluminum oxide is 1.5:1.

[0039] The amount of the catalyst added in S11 is 0.05% of the mass of 2-allylphenol.

[0040] The mass fraction of the sodium hydroxide solution in S11 is 30%, and the amount of the sodium hydroxide solution added is 88% of the mass of epichlorohydrin.

[0041] The amount of tetrabutylammonium bromide added in S11 is 0.5% of the mass of epichlorohydrin.

[0042] The mass ratio of the allyl epoxy monomer, the styrene monomer and the dispersant in the S12 is 12:51:1.5.

[0043] The dispersant in the S12 is Tween80.

[0044] The amount of the initiator dibenzoyl peroxide added in S12 is 0.68% of the mass of the styrene monomer.

[0045] The particle size range of the modified polystyrene in S12 is 3 to 4 mm.

[0046] The preparation method of the enhancer is as follows: placing benzofuran-6-carboxylic acid and maleimide in an appropriate amount of dimethylformamide and stirring for 25 minutes, heating to 65° C. and reacting for 1.8 hours, and after the reaction is completed, reducing pressure, concentrating, filtering, washing, and drying to obtain the enhancer.

[0047] The molar ratio of the benzofuran-6-carboxylic acid to maleimide is 2.8:1.

[0048] The preparation method of the high-strength anti-oxidation polystyrene exterior wallboard is: S21, adding expanded graphite and silica aerogel into a solid mixer, spraying the silane coupling agent solution, stirring evenly and drying to obtain a mixture A; S22, uniformly mixing the modified polystyrene, the flame retardant and the foaming agent to obtain a mixture B; S23, pre-foaming the mixture B, and then ripening it at room temperature for 12 hours; S24, mixing the matured mixed material B with the mixed material A and the reinforcing agent uniformly, and then drying and granulating to obtain external wall board particles; S25, the exterior wall panel particles are subjected to a steam compression molding process, and after demoulding, they are dried to obtain a high-strength, anti-oxidation polystyrene exterior wall panel.

[0049] The size of the expanded graphite in S21 is 0.4 mm; the size of the silica aerogel is 0.5 mm The concentration of the silane coupling agent solution in S21 is 2%, and the silane coupling agent is KH550; the drying temperature is 75° C., and the drying time is 6 hours.

[0050] The flame retardant in S22 is a phosphorus-based flame retardant.

[0051] The pre-foaming temperature in S23 is 90° C. and the pre-foaming time is 4 minutes.

[0052] The drying and granulation in S24 is carried out at a temperature of 75° C. and for 25 minutes.

[0053] The temperature of the steam compression molding in S25 is 120° C. and the pressure is 0.5 MPa.

[0054] The drying temperature in S25 is 55° C. and the drying time is 36 hours.

[0055] Example 2: A high-strength, anti-oxidation polystyrene exterior wall panel. The raw materials of the polystyrene exterior wall panel include the following components in parts by weight: 70 parts of modified polystyrene, 0.2 parts of silane coupling agent, 7 parts of expanded graphite, 1 part of silica aerogel, 0.5 parts of flame retardant, 2 parts of foaming agent, and 5 parts of reinforcing agent.

[0056] The preparation method of the modified polystyrene is: S11, adding 2-allylphenol and a catalyst into a reaction kettle, heating to 80°C under nitrogen protection, adding epichlorohydrin dropwise and stirring for 4 hours, cooling to room temperature, adding sodium hydroxide solution and tetrabutylammonium bromide, and carrying out a ring-closure reaction at 35°C for 3 hours, and performing reduced pressure distillation, filtering and desalting to obtain an allyl epoxy monomer; S12. Add allyl epoxy monomer, styrene monomer and dispersant into ethanol and stir for 10 minutes, add initiator dibenzoyl peroxide, heat to 70°C and copolymerize for 5 hours, terminate the reaction with methanol, remove most of the ethanol by rotary evaporation, filter and wash with deionized water and ethanol for multiple times, and obtain granular modified polystyrene containing epoxy groups after drying.

[0057] The molar ratio of 2-allylphenol to epichlorohydrin in S11 is 4:1.

[0058] The dripping rate of epichlorohydrin in S11 is 6 ml / min.

[0059] The catalyst in S11 is zinc perchlorate and aluminum oxide, and the mass ratio of zinc perchlorate to aluminum oxide is 1:1.

[0060] The amount of the catalyst added in S11 is 0.01% of the mass of 2-allylphenol.

[0061] The mass fraction of the sodium hydroxide solution in S11 is 25%, and the amount of the sodium hydroxide solution added is 80% of the mass of epichlorohydrin.

[0062] The amount of tetrabutylammonium bromide added in S11 is 0.2% of the mass of epichlorohydrin.

[0063] The mass ratio of the allyl epoxy monomer, the styrene monomer and the dispersant in the S12 is 10:45:1.

[0064] The dispersant in the S12 is Tween80.

[0065] The amount of the initiator dibenzoyl peroxide added in S12 is 0.5% of the mass of the styrene monomer.

[0066] The particle size range of the modified polystyrene in S12 is 3 to 4 mm.

[0067] The preparation method of the enhancer is as follows: placing benzofuran-6-carboxylic acid and maleimide in dimethylformamide and stirring for 20 minutes, heating to 60° C. to react for 1 hour, and after the reaction is completed, reducing pressure, concentrating, filtering, washing, and drying to obtain the enhancer.

[0068] The molar ratio of the benzofuran-6-carboxylic acid to maleimide is 2.2:1.

[0069] The preparation method of the high-strength anti-oxidation polystyrene exterior wallboard is: S21, adding expanded graphite and silica aerogel into a solid mixer, spraying the silane coupling agent solution, stirring evenly and drying to obtain a mixture A; S22, uniformly mixing the modified polystyrene, the flame retardant and the foaming agent to obtain a mixture B; S23, pre-foaming the mixture B, and then ripening it at room temperature for 12 hours; S24, mixing the matured mixed material B with the mixed material A and the reinforcing agent uniformly, and then drying and granulating to obtain external wall board particles; S25, the exterior wall panel particles are subjected to a steam compression molding process, and after demoulding, they are dried to obtain a high-strength, anti-oxidation polystyrene exterior wall panel.

[0070] The size of the expanded graphite in S21 is 0.3 mm; the size of the silica aerogel is 0.2 mm The concentration of the silane coupling agent solution in S21 is 1%, and the silane coupling agent is KH550; the drying temperature is 70° C., and the drying time is 7 hours.

[0071] The flame retardant in S22 is magnesium hydroxide.

[0072] The pre-foaming temperature in S23 is 80° C. and the time is 5 minutes.

[0073] The drying and granulation in S24 is carried out at a temperature of 70° C. and for 20 minutes.

[0074] The temperature of the steam compression molding in S25 is 110° C. and the pressure is 0.6 MPa.

[0075] The drying temperature in S25 is 60° C. and the drying time is 24 hours.

[0076] Example 3: A high-strength, anti-oxidation polystyrene exterior wall panel. The raw materials of the polystyrene exterior wall panel include the following components in parts by weight: 80 parts of modified polystyrene, 0.4 parts of silane coupling agent, 9 parts of expanded graphite, 3 parts of silica aerogel, 1 part of flame retardant, 4 parts of foaming agent, and 10 parts of reinforcing agent.

[0077] The preparation method of the modified polystyrene is: S11, adding 2-allylphenol and a catalyst into a reaction kettle, heating to 90°C under nitrogen protection, adding epichlorohydrin dropwise and stirring for 5 hours, cooling to room temperature, adding sodium hydroxide solution and tetrabutylammonium bromide, and carrying out a ring-closure reaction at 40°C for 4 hours, and performing reduced pressure distillation, filtering and desalting to obtain an allyl epoxy monomer; S12. Add allyl epoxy monomer, styrene monomer and dispersant into ethanol and stir for 15 minutes, add initiator dibenzoyl peroxide, heat to 85°C and copolymerize for 7 hours, terminate the reaction with methanol, remove most of the ethanol by rotary evaporation, filter and wash with deionized water and ethanol for multiple times, and obtain granular modified polystyrene containing epoxy groups after drying.

[0078] The molar ratio of 2-allylphenol to epichlorohydrin in S11 is 7:1.

[0079] The dripping rate of epichlorohydrin in S11 is 10 ml / min.

[0080] The catalyst in S11 is zinc perchlorate and aluminum oxide, and the mass ratio of zinc perchlorate to aluminum oxide is 2:1.

[0081] The amount of the catalyst added in S11 is 0.1% of the mass of 2-allylphenol.

[0082] The mass fraction of the sodium hydroxide solution in S11 is 35%, and the amount of the sodium hydroxide solution added is 95% of the mass of epichlorohydrin.

[0083] The amount of tetrabutylammonium bromide added in S11 is 0.8% of the mass of epichlorohydrin.

[0084] The mass ratio of the allyl epoxy monomer, the styrene monomer and the dispersant in the S12 is 15:60:2.

[0085] The dispersant in S12 is Span20.

[0086] The amount of the initiator dibenzoyl peroxide added in S12 is 0.8% of the mass of the styrene monomer.

[0087] The particle size range of the modified polystyrene in S12 is 3 to 4 mm.

[0088] The preparation method of the enhancer is as follows: placing benzofuran-6-carboxylic acid and maleimide in dimethylformamide and stirring for 30 minutes, heating to 70° C. to react for 2 hours, and after the reaction is completed, concentrating under reduced pressure, filtering, washing, and drying to obtain the enhancer.

[0089] The molar ratio of the benzofuran-6-carboxylic acid to maleimide is 3.6:1.

[0090] The preparation method of the high-strength anti-oxidation polystyrene exterior wallboard is: S21, adding expanded graphite and silica aerogel into a solid mixer, spraying the silane coupling agent solution, stirring evenly and drying to obtain a mixture A; S22, uniformly mixing the modified polystyrene, the flame retardant and the foaming agent to obtain a mixture B; S23, pre-foaming the mixture B, and then ripening it at room temperature for 12 hours; S24, mixing the matured mixed material B with the mixed material A and the reinforcing agent uniformly, and then drying and granulating to obtain external wall board particles; S25, the exterior wall panel particles are subjected to a steam compression molding process, and after demoulding, they are dried to obtain a high-strength, anti-oxidation polystyrene exterior wall panel.

[0091] The size of the expanded graphite in S21 is 0.6 mm; the size of the silica aerogel is 1 mm The concentration of the silane coupling agent solution in S21 is 3%, and the silane coupling agent is KH792; the drying temperature is 80° C., and the drying time is 5 hours.

[0092] The flame retardant in S22 is a phosphorus-based flame retardant.

[0093] The pre-foaming temperature in S23 is 100° C. and the time is 3 minutes.

[0094] The drying and granulation in S24 is carried out at a temperature of 80° C. and for 20 minutes.

[0095] The temperature of the steam compression molding in S25 is 115° C. and the pressure is 0.4 MPa.

[0096] The drying temperature in S25 is 50° C. and the drying time is 24 hours.

[0097] Comparative Example 1 Representative Example 1 was selected as Comparative Example 1, in which the enhancer was removed and the rest was the same as Example 1.

[0098] Comparative Example 2 Representative Example 1 was selected as Comparative Example 2, in which the modified polystyrene was replaced by an equal amount of unmodified commercially available polystyrene, and the rest was consistent with Example 1.

[0099] The exterior wall panels prepared in Examples 1-3 and Comparative Examples 1-2 were tested for strength, waterproofness, flame retardancy, thermal insulation and other performances, as shown in Table 1.

[0100] Table 1 As can be seen from Table 1, the exterior wall panels prepared in Examples 1-3 have excellent performance in terms of strength, waterproofing, flame retardancy, and thermal insulation. Compared with Example 1, Comparative Example 1 has poor tensile strength and impact strength. This is because after removing the reinforcing agent, the epoxy group can only form a small number of cross-linked structures with amino and hydroxyl groups after ring opening in the absence of a catalyst. Compared with Example 1, Comparative Example 2 has a significant decrease in tensile strength and impact strength, and the waterproof effect is also reduced. This is because the unmodified polystyrene does not contain epoxy groups, and the amino groups on the surface of the expanded graphite and silica aerogel in the mixture A can react with the carboxyl and anhydride groups generated by the breakage of the Diels-Alder bond to produce a small amount of cross-linked structure. The reduction of epoxy cross-linked structure leads to a decrease in strength, and the epoxy cross-linked structure has a certain hydrophobicity. Therefore, the water absorption rate of Comparative Example 2 is higher than that of Examples 1-3 and Comparative Example 1.

[0101] The exterior wall panels prepared in Example 1 and Comparative Examples 1-2 were subjected to a 1000-hour UV aging test with the following parameters: UV irradiation intensity of 39 mW / cm 2 , humidity 56%, temperature 65℃, and test the tensile strength and impact strength after aging. See Table 2 for details.

[0102] Table 2 It can be seen from Table 2 that the addition of the reinforcing agent improves the antioxidant capacity of the exterior wall panels and slows down the aging rate.

[0103] Unless otherwise specified, the ratios and percentages described in the present invention are all weight ratios and weight percentages; and the raw materials are all commercially available.

[0104] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-strength, anti-oxidation polystyrene exterior wall panel, characterized in that: The raw materials of the polystyrene exterior wall board include the following components in parts by weight: 70-80 parts of modified polystyrene, 0.2-0.4 parts of silane coupling agent, 7-9 parts of expanded graphite, 1-3 parts of silica aerogel, 0.5-1 parts of flame retardant, 2-4 parts of foaming agent, and 5-10 parts of reinforcing agent.

2. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 1, characterized in that: The preparation method of the modified polystyrene is: S11, adding 2-allylphenol and a catalyst into a reaction kettle, heating to 80-90°C under nitrogen protection, then dropping epichlorohydrin and stirring to react for 4-5 hours, cooling to room temperature, adding sodium hydroxide solution and tetrabutylammonium bromide, and performing a ring-closure reaction at 35-40°C for 3-4 hours, and performing reduced pressure distillation, filtering and desalting to obtain an allyl epoxy monomer; S12. Add allyl epoxy monomer, styrene monomer and dispersant to an appropriate amount of ethanol and stir for 10 to 15 minutes, add initiator dibenzoyl peroxide, raise the temperature to 70 to 85°C and copolymerize for 5 to 7 hours, terminate the reaction with methanol, remove most of the ethanol by rotary evaporation, filter and wash with deionized water and ethanol in turn for multiple times, and obtain granular modified polystyrene containing epoxy groups after drying.

3. The high-strength, anti-oxidation polystyrene exterior wall panel according to claim 2, characterized in that: The molar ratio of 2-allylphenol to epichlorohydrin in S11 is 4 to 7:1; The dripping rate of epichlorohydrin in S11 is 6-10 ml / min; The catalyst in S11 is zinc perchlorate and aluminum oxide, and the mass ratio of zinc perchlorate to aluminum oxide is 1 to 2:1; The amount of the catalyst added in S11 is 0.01 to 0.1% of the mass of 2-allylphenol; The mass fraction of the sodium hydroxide solution in S11 is 25-35%, and the amount of the sodium hydroxide solution added is 80-95% of the mass of epichlorohydrin; The amount of tetrabutylammonium bromide added in S11 is 0.2-0.8% of the mass of epichlorohydrin.

4. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 2, characterized in that: The mass ratio of the allyl epoxy monomer, the styrene monomer and the dispersant in S12 is 10-15:45-60:1-2; The dispersant in S12 is one or more of Tween80, Span20, and fatty alcohol polyoxyethylene ether; The amount of the initiator dibenzoyl peroxide added in S12 is 0.5-0.8% of the mass of the styrene monomer.

5. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 1, characterized in that: The preparation method of the enhancer is as follows: placing benzofuran-6-carboxylic acid and maleimide in an appropriate amount of dimethylformamide and stirring for 20 to 30 minutes, heating to 60 to 70° C. for reaction for 1 to 2 hours, and after the reaction is completed, reducing pressure, concentrating, filtering, washing, and drying to obtain the enhancer.

6. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 5, characterized in that: The molar ratio of the benzofuran-6-carboxylic acid to maleimide is 2.2-3.6:

1.

7. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 1, characterized in that: The preparation method of the high-strength anti-oxidation polystyrene exterior wallboard is: S21, adding expanded graphite and silica aerogel into a solid mixer, spraying the silane coupling agent solution, stirring evenly and drying to obtain a mixture A; S22, uniformly mixing the modified polystyrene, the flame retardant and the foaming agent to obtain a mixture B; S23, pre-foaming the mixture B, and then ripening it at room temperature for 12 hours; S24, mixing the matured mixed material B with the mixed material A and the reinforcing agent uniformly, and then drying and granulating to obtain external wall board particles; S25, the exterior wall panel particles are subjected to a steam compression molding process, and after demoulding, they are dried to obtain a high-strength, anti-oxidation polystyrene exterior wall panel.

8. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 7, characterized in that: The size of the expanded graphite in S21 is 0.3-0.6 mm; the size of the silica aerogel is 0.2-1 mm; The concentration of the silane coupling agent solution in S21 is 1-3%, and the silane coupling agent is one or more of KH550 and KH792; the drying temperature is 70-80° C., and the drying time is 5-7 hours.

9. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 7, characterized in that: The flame retardant in S22 is one or more of magnesium hydroxide, aluminum hydroxide, and phosphorus-based flame retardant; The pre-foaming temperature in S23 is 80-100° C. and the time is 3-5 min; The drying and granulation in S24 is carried out at a temperature of 70 to 80° C. and for a time of 20 to 30 minutes.

10. The high-strength, oxidation-resistant polystyrene exterior wall panel according to claim 7, characterized in that: The temperature of the steam compression molding in S25 is 110-120° C. and the pressure is 0.4-0.6 MPa; The drying temperature in S25 is 50-60° C. and the drying time is 24-48 hours.

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