Temperature-resistant, flame-retardant and anti-corrosion composite material for building as well as preparation method and application of composite material

Abstract

The invention discloses a temperature-resistant, flame-retardant and anti-corrosion composite material for a building as well as a preparation method and application of the composite material, and belongs to the technical field of polycarbonate building materials. The composite material is prepared from the following components in parts by weight: 60 to 80 parts of polycarbonate, 8 to 10 parts of a dispersing agent, 10 to 20 parts of epoxidized silicone rubber, 1 to 5 parts of benzotriazole, 1 to 5 parts of a flame retardant, 3 to 5 parts of a compatible aid, 0.3 to 0.5 part of an antioxidant, 0.2 to 0.5 part of a light stabilizer, 0.15 to 0.3 part of an anti-dripping agent and 0.2 to 0.4 part of a catalyst. According to the composite material, polycarbonate is used as a base material, the flame retardance and the corrosion resistance of the composite material can be remarkably improved by adding the epoxidized silicone rubber and the benzotriazole, the temperature resistance of the material is not obviously reduced, and the service life of the material is prolonged.

Description

Technical Field

[0001] The present application relates to a heat-resistant, flame-retardant, corrosion-resistant composite material for construction, a preparation method thereof, and applications thereof, and belongs to the technical field of polycarbonate construction materials. Background Art

[0002] Polycarbonate building formwork is a novel building formwork material made from polycarbonate (PC) resin, supplemented with functional additives such as antioxidants and UV absorbers, and manufactured through extrusion or injection molding. Polycarbonate exhibits excellent overall performance, and formwork made from it offers advantages such as light weight, high strength, smooth surface, dimensional stability, and reusability. Compared to traditional wood and steel formwork, it can significantly reduce construction costs and improve efficiency.

[0003] In actual construction, polycarbonate building formwork materials have high demands for heat resistance, flame retardancy, and corrosion resistance. In terms of temperature resistance, the temperature of the construction environment fluctuates greatly. During the high temperatures of summer, polycarbonate formwork must maintain stable physical properties in a high temperature environment above 60°C, without deformation or softening. During the low temperatures of winter, at temperatures of -20°C or even lower, it must still have good toughness to avoid brittle cracking. In terms of flame retardancy, due to the fire hazards such as open flame operations at the construction site, polycarbonate building formwork must meet a certain flame retardancy level to reduce the spread and degree of damage in the event of a fire. The demand for corrosion resistance stems from the fact that during the construction process, the formwork will come into contact with alkaline substances in the cement slurry, rainwater, and various chemical admixtures. The polycarbonate formwork must have good chemical stability to prevent corrosion, thereby extending its service life and ensuring construction quality.

[0004] Patent CN103102669A discloses a heat-resistant, low-smoke, halogen-free, flame-retardant PC / ABS alloy material, which synergistically improves the temperature resistance and flame retardancy of the alloy material by adding a halogen-free flame retardant and a heat-resistant modifier to the PC / ABS substrate, and can also reduce smoke density. Patent CN117402477A discloses a flame-retardant polycarbonate material with a short molding cycle, which improves the material's flame retardancy and rigidity at high temperatures by adding modified silicone rubber and sulfonate flame retardants to facilitate demolding. However, none of the above patents pay attention to the corrosion resistance of the polycarbonate material. If it is used in construction, the alloy material will corrode, reducing the service life of the alloy material. In addition, the addition of modified silicone rubber will reduce the heat deformation temperature of the polycarbonate, thereby reducing the temperature resistance of the material.

[0005] In order to give polycarbonate materials anti-corrosion properties, researchers usually think of adding anti-corrosion additives to the materials. However, the applicant found that if the amount of preservative added is small, it is difficult to achieve ideal anti-corrosion properties. If the amount of preservative added is large, firstly, there will be uneven dispersion of the raw materials, resulting in poor uniformity of various properties of the material; secondly, the proportion of heat-resistant additives and flame retardants will be reduced, thereby reducing temperature resistance and flame retardancy; thirdly, the addition of too many additives will lead to a decrease in the proportion of polycarbonate substrate, which will not only affect the mechanical properties of the material, but also cause the additives to migrate outward during long-term use, making it difficult to maintain the initial state, thereby reducing various properties of the material and shortening the service life of the material. Summary of the Invention

[0006] In order to solve the above problems, a heat-resistant, flame-retardant and corrosion-resistant composite material for construction is provided. The composite material is based on polycarbonate. The addition of epoxidized silicone rubber and benzotriazole can significantly improve the flame retardancy and corrosion resistance of the composite material, and make the temperature resistance of the material decrease less significantly, thereby extending the service life of the material.

[0007] According to a first aspect of the present application, there is provided a heat-resistant, flame-retardant, and corrosion-resistant composite material for construction, comprising, by weight:

[0008] 60-80 parts of polycarbonate, 8-10 parts of dispersant, 10-20 parts of epoxidized silicone rubber, 1-5 parts of benzotriazole, 1-5 parts of flame retardant, 3-5 parts of compatibilizer, 0.3-0.5 parts of antioxidant, 0.2-0.5 parts of light stabilizer, 0.15-0.3 parts of anti-dripping agent, and 0.2-0.4 parts of catalyst.

[0009] Benzotriazole, as a preservative, can improve the corrosion resistance of polycarbonate. However, relying solely on this substance for corrosion protection still presents the problems described in the background art. To address this problem, this application, in addition to a small amount of flame retardant and preservative, significantly improves the heat resistance, flame retardancy, and corrosion resistance of polycarbonate by adding epoxidized silicone rubber. However, there are compatibility issues between epoxidized silicone rubber and polycarbonate, so this application also adds a compatibility aid to improve the compatibility between the two, thereby obtaining a composite material with good compatibility and more uniform properties.

[0010] Optionally, the epoxidized silicone rubber is epoxidized phenyl silicone rubber.

[0011] The addition of the epoxidized phenyl silicone rubber of the present application has the following advantages:

[0012] 1. Does not significantly reduce heat deformation temperature:

[0013] Since the main chain of epoxidized phenyl silicone rubber contains a silicon-oxygen bond and the side chain contains an epoxy group and a phenyl group, the bond energy of the main chain silicon-oxygen bond is higher than that of the CC bond, and the phenyl group contained in the side chain gives the molecular chain higher rigidity and cohesive energy, which can effectively inhibit the movement of the molecular chain at high temperatures. Therefore, the addition of the epoxidized phenyl silicone rubber will not significantly reduce the heat deformation temperature of the material, so that the material maintains good heat deformation resistance.

[0014] 2. Improve flame retardancy:

[0015] During the initial combustion phase, the silicon in epoxidized phenyl silicone rubber migrates to the material's surface, reacting with oxygen in the air to form silicon dioxide (SiO2). This silicon dioxide, along with the phenyl oxidation products, forms a ceramic-like char layer containing silicon and carbon. This char layer has a dense structure and excellent thermal and oxygen-isolating properties, effectively preventing heat transfer to the substrate, reducing the release of combustible gases and inhibiting the combustion reaction. Furthermore, when epoxidized phenyl silicone rubber is blended with polycarbonate, it alters the polycarbonate's thermal decomposition pathway, causing it to produce more carbonaceous residue, further enhancing its flame retardant effect.

[0016] 3. Improve corrosion resistance:

[0017] The silicon-oxygen bonds of epoxidized phenyl silicone rubber are chemically stable and resistant to reactions with corrosive media such as acids, bases, oxygen, and moisture. When blended with polycarbonate, it forms a continuous, dense multi-layer silicone rubber film on and within the material. This film, with its low surface energy and hydrophobicity, effectively prevents moisture, corrosive gases, and chemicals from penetrating the polycarbonate, acting as a physical barrier. Furthermore, the phenyl groups in the side chains exhibit excellent chemical inertness, resisting attack by most chemicals and synergistically enhancing the corrosion resistance of polycarbonate.

[0018] 4. Promote the dispersion of benzotriazole

[0019] The amino group contained in benzotriazole can react with the epoxy group contained in the epoxidized phenyl silicone rubber. Therefore, the addition of the epoxidized phenyl silicone rubber can promote the dispersion of benzotriazole and further improve the performance uniformity of the material.

[0020] Optionally, the epoxidized phenyl silicone rubber has a vinyl content of 20-25% and an epoxy content of 15-20%.

[0021] The above-mentioned vinyl content and epoxy content can make the heat resistance, flame retardancy, corrosion resistance and mechanical properties of the composite material reach the best. If the vinyl content is too high, it will have little effect on the flame retardancy, but will cause the heat resistance and corrosion resistance to decrease; if the phenyl content is too high, it will cause the brittleness of the composite material to increase and reduce the mechanical properties of the material at high temperature.

[0022] Optionally, the preparation method of the epoxidized silicone rubber refers to patent CN110358091B.

[0023] Optionally, the compatibilizing agent is obtained by copolymerizing acrylamide, styrene and propenyltrichlorosilane in a weight ratio of (3-5): (3-4): 1.

[0024] The compatibilizer disclosed herein is obtained by copolymerizing the three aforementioned substances. This compatibilizer effectively improves the compatibility of polycarbonate and epoxidized silicone rubber, resulting in a composite material with superior overall performance. Furthermore, the compatibilizer contains amide groups that react with the epoxidized silicone rubber to form a crosslinked network. Under high-temperature conditions, this network restricts the movement of polycarbonate molecular chains, raising the polycarbonate's glass transition temperature and heat distortion temperature, enabling it to maintain good mechanical properties and dimensional stability at higher temperatures. It also improves the overall density of the material, further enhancing its flame retardancy and corrosion resistance.

[0025] Optionally, the propenyltrichlorosilane is at least one selected from allyldimethylsilane, propenyltrichlorosilane, allyl(chloromethyl)dimethylsilane, and trimethylallyloxysilane.

[0026] The raw material of the acryltrichlorosilane is easily available, which is conducive to the industrial production of the compatibilizing agent.

[0027] Preferably, the propenyltrichlorosilane is selected from propenyltrichlorosilane or allyl(chloromethyl)dimethylsilane. The above two propenyltrichlorosilane species contain halogen atoms, which can further improve the flame retardancy of the composite material and improve the compatibility with the flame retardant, so that the flame retardant can be evenly dispersed in the composite material.

[0028] Optionally, the preparation method of the compatibilizing agent is:

[0029] S1: Add 1 / 3 acrylamide and 1 / 2 styrene to a solvent, then add an initiator and sodium dodecylbenzene sulfonate, and react at 60-80°C for 1-3 hours to obtain a prepolymer;

[0030] S2: Add the remaining acrylamide, styrene and propenyltrichlorosilane to the prepolymer, continue to react at the same temperature for 3-5 hours, then raise the temperature to 95° C. and react for 0.5-1 hour. Discharge, filter, wash and dry to obtain the compatibilizer.

[0031] Propylene trichlorosilane has low free radical activity under the action of free radical initiators, so its copolymerization is limited and cannot effectively form high molecular weight polymers. In this preparation method, prepolymerization in step S1 is first performed to allow the prepolymer to initiate the reaction of propenyl trichlorosilane, thereby improving the reaction efficiency of the copolymer and obtaining an ideal compatibilizer.

[0032] The initiator is selected from benzoyl peroxide and / or azobisisobutyronitrile, and the added amount of the initiator accounts for 1-3% of the total weight of acrylamide, styrene and propenyltrichlorosilane.

[0033] The amount of initiator added in the present application is larger than that in conventional styrene and acrylamide copolymerization because the reaction activity of propenyltrichlorosilane in polymerization is low, so more initiator is needed for initiation to improve the reaction efficiency.

[0034] Preferably, the initiator is selected from benzoyl peroxide and azobisisobutyronitrile in a weight ratio of 1:1. Since the activity of propenyltrichlorosilane in participating in the reaction is low, the present application can improve the reaction efficiency of propenyltrichlorosilane and reduce the reaction time by co-initiating with the two initiators.

[0035] The added amount of the sodium dodecylbenzenesulfonate accounts for 1-3% of the total weight of acrylamide, styrene and propenyltrichlorosilane.

[0036] Optionally, the flame retardant is selected from nitrogen-containing flame retardants or phosphorus-containing flame retardants.

[0037] Preferably, the flame retardant is selected from melamine and [(6-oxo-6H-dibenzo[C,E][1,2]oxaphosphorin-6-yl)methyl]succinic acid in a weight ratio of 1:1.

[0038] This flame retardant can exert the best flame retardant effect, and [(6-oxo-6H-dibenzo[C,E][1,2]oxaphosphorin-6-yl)methyl]succinic acid also contains a carboxyl group, which can also react with the epoxy group in the epoxidized silicone rubber under the action of a catalyst, thereby introducing the flame retardant into the cross-linked network and promoting the dispersion of the flame retardant.

[0039] Optionally, the dispersant is selected from at least one of sodium silicate, sodium metasodium hexaphosphate and triethanolamine;

[0040] The antioxidant is selected from at least one of antioxidant 168, antioxidant 1010, and antioxidant 1076;

[0041] The light stabilizer is selected from poly[1-(2'-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidinyl succinate] (light stabilizer 622) or poly[[6-[(1,1,3,3-tetramethylbutyl)amine]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imine]-1,6-dihexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imine]]] (light stabilizer TH-944), preferably poly[[6-[(1,1,3,3-tetramethylbutyl)amine]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imine]-1,6-dihexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imine]]];

[0042] The anti-dripping agent is selected from polytetrafluoroethylene or anti-dripping agent SN3310;

[0043] The catalyst is selected from at least one of triethylamine, zinc chloride and sodium hydroxide, preferably sodium hydroxide.

[0044] Optionally, the polycarbonate has a melt index (MI) of 5 g / 10 min to 20 g / 10 min, preferably 10 g / 10 min, at 300° C. and a load of 1.2 kg.

[0045] According to a second aspect of the present application, there is provided a method for preparing the composite material described in any one of the above items, comprising the following steps:

[0046] (1) mixing the polycarbonate, 1 / 2 of a dispersant, 1 / 2 of a compatibilizer, a flame retardant, and an anti-dripping agent to obtain a first mixture;

[0047] The epoxidized silicone rubber, 1 / 2 of the dispersant, 1 / 2 of the compatibilizer, an antioxidant, a light stabilizer and a catalyst are mixed to obtain a second mixture;

[0048] (2) The first mixed material and the second mixed material are mixed, and then added into an extruder, melted, extruded, and granulated to obtain the product.

[0049] Optionally, the extruder is a twin-screw extruder, and the extrusion temperature of the twin-screw extruder is 220-280° C. and the rotation speed is 200-500 rpm.

[0050] According to a third aspect of the present application, there is provided use of any of the above-mentioned composite materials in building materials.

[0051] The beneficial effects of this application include but are not limited to:

[0052] 1. According to the heat-resistant, flame-retardant and corrosion-resistant composite material for construction of the present application, the addition of epoxidized silicone rubber can simultaneously improve the heat resistance, flame retardancy and corrosion resistance of the material, and the epoxy groups it contains can chemically connect with benzotriazole and compatibilizers, which has the effect of promoting the uniform dispersion of raw materials and forming a protective layer, thereby significantly improving the heat resistance, flame retardancy and corrosion resistance.

[0053] 2. According to the heat-resistant, flame-retardant and corrosion-resistant composite material for construction of this application, the use of epoxidized phenyl silicone rubber can further improve the flame retardancy of the material and maintain good temperature resistance. Under the above-mentioned limitations of vinyl content and epoxy content, the material's heat resistance, flame retardancy and corrosion resistance can be optimized.

[0054] 3. According to the heat-resistant, flame-retardant and corrosion-resistant building composite material of the present application, the poor compatibility of polycarbonate and epoxidized silicone rubber will affect the performance uniformity of the components formed by the materials. The added compatibility additive can effectively improve the compatibility of polycarbonate and epoxidized silicone rubber to obtain a building material with good uniformity in various properties.

[0055] 4. According to the preparation method of the heat-resistant, flame-retardant and corrosion-resistant building composite material of the present application, by pre-mixing polycarbonate and epoxidized silicone rubber with other additives to form a first mixture and a second mixture, the dispersion of the additives in the material can be effectively improved, and the dispersion uniformity of polycarbonate and epoxidized silicone rubber can be improved, thereby obtaining a building material with more uniform performance. DETAILED DESCRIPTION

[0056] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0057] Unless otherwise specified, the raw materials used in the examples and comparative examples of this application were purchased from commercial sources. The epoxidized silicone rubber used in the following examples and comparative examples was prepared using the method described in Example 1 of CN110358091B. The polycarbonate had a melt index (MI) of 10 g / 10 min at 300°C and a load of 1.2 kg.

[0058] Unless otherwise specified, the methods used in the examples and comparative examples of this application are conventional methods in the prior art. In the preparation of the compatibilizers in the following examples and comparative examples, the selected solvents are not specifically limited, as long as the raw materials can be guaranteed to have good solubility and are convenient for the discharge of subsequent products. The temperature of the extruder in the following examples and comparative examples is 220-280°C, which specifically means that the extruder is divided into five temperature sections, the temperature of the conveying section is 220-230°C, the temperature of the melting section is 230-250°C, the temperature of the mixing section is 250-260°C, the temperature of the exhaust section is 260-270°C, the temperature of the homogenizing section is 270-280°C, and the temperature of the extrusion die head is 270-280°C.

[0059] Example 1

[0060] This embodiment relates to a heat-resistant, flame-retardant, and corrosion-resistant composite material for construction and a preparation method thereof. The composite material comprises, by weight:

[0061] 60 parts of polycarbonate, 8 parts of sodium silicate, 10 parts of epoxidized silicone rubber, 1 part of benzotriazole, 1 part of melamine, 3 parts of compatibilizer, 0.3 parts of antioxidant 168, 0.2 parts of light stabilizer 622, 0.15 parts of polytetrafluoroethylene, and 0.2 parts of catalyst.

[0062] The preparation method of the composite material comprises the following steps:

[0063] (1) mixing the polycarbonate, 1 / 2 of sodium silicate, 1 / 2 of a compatibilizer, benzotriazole, melamine, and polytetrafluoroethylene to obtain a first mixture;

[0064] The epoxidized silicone rubber, 1 / 2 of the sodium silicate, 1 / 2 of the compatibilizer, antioxidant 168, light stabilizer 622 and sodium hydroxide are mixed to obtain a second mixture;

[0065] (2) The first mixed material and the second mixed material are mixed, and then added into an extruder, extruded at 220-280° C. and 200 rpm, and granulated to obtain the product.

[0066] The compatibilizer is obtained by copolymerizing acrylamide, styrene and allyldimethylsilane in a weight ratio of 3:3:1. The preparation method of the compatibilizer is as follows:

[0067] S1: 1 / 3 acrylamide and 1 / 2 styrene are added to a solvent, followed by the addition of an initiator (benzoyl peroxide and azobisisobutyronitrile in a weight ratio of 1:1) at a concentration of 3% based on the total weight of acrylamide, styrene, and allyldimethylsilane, and sodium dodecylbenzenesulfonate at a concentration of 3% based on the total weight of acrylamide, styrene, and allyldimethylsilane, and the reaction is carried out at 60°C for 3 hours to obtain a prepolymer;

[0068] S2: Add the remaining acrylamide, styrene and allyldimethylsilane to the prepolymer, continue to react at the same temperature for 5 hours, then raise the temperature to 95° C. and react for 0.5 hours. Discharge, filter, wash and dry the material to obtain the compatibilizer.

[0069] Example 2

[0070] This embodiment relates to a heat-resistant, flame-retardant, and corrosion-resistant composite material for construction and a preparation method thereof. The composite material comprises, by weight:

[0071] 80 parts of polycarbonate, 10 parts of sodium hexaphosphate, 20 parts of epoxidized silicone rubber, 5 parts of benzotriazole, 5 parts of melamine, 5 parts of compatibilizer, 0.5 parts of antioxidant 1010, 0.5 parts of light stabilizer 622, 0.3 parts of anti-dripping agent SN3310, and 0.4 parts of catalyst.

[0072] The preparation method of the composite material comprises the following steps:

[0073] (1) mixing the polycarbonate, 1 / 2 of sodium hexaphosphate, 1 / 2 of a compatibilizer, benzotriazole, melamine, and an anti-dripping agent SN3310 to obtain a first mixture;

[0074] The epoxidized silicone rubber, 1 / 2 of sodium hexaphosphate, 1 / 2 of a compatibilizer, antioxidant 1010, light stabilizer 622, and sodium hydroxide are mixed to obtain a second mixture;

[0075] (2) The first mixed material and the second mixed material are mixed, and then added into an extruder, extruded at 220-280° C. and 500 rpm, and granulated to obtain the product.

[0076] The compatibilizer is obtained by copolymerizing acrylamide, styrene and allyl (chloromethyl) disilane in a weight ratio of 5:3:1. The preparation method of the compatibilizer is as follows:

[0077] S1: 1 / 3 acrylamide and 1 / 2 styrene are added to a solvent, followed by the addition of an initiator (benzoyl peroxide and azobisisobutyronitrile in a weight ratio of 1:1) based on the total weight of acrylamide, styrene, and allyl(chloromethyl)dimethylsilane, and sodium dodecylbenzenesulfonate in a weight ratio of 1% based on the total weight of acrylamide, styrene, and allyl(chloromethyl)dimethylsilane, and the reaction is carried out at 80° C. for 1 h to obtain a prepolymer;

[0078] S2: Add the remaining acrylamide, styrene and allyl (chloromethyl) disilane to the prepolymer, continue to react at the same temperature for 3 hours, then raise the temperature to 95° C. and react for 1 hour. Discharge, filter, wash and dry to obtain the compatibilizer.

[0079] Example 3

[0080] This embodiment relates to a heat-resistant, flame-retardant, and corrosion-resistant composite material for construction and a preparation method thereof. The composite material comprises, by weight:

[0081] 70 parts of polycarbonate, 10 parts of triethanolamine, 15 parts of epoxidized silicone rubber, 3 parts of benzotriazole, 3 parts of melamine, 4 parts of compatibilizer, 0.4 parts of antioxidant 1010, 0.3 parts of light stabilizer TH-944, 0.2 parts of polytetrafluoroethylene, and 0.3 parts of catalyst.

[0082] The preparation method of the composite material comprises the following steps:

[0083] (1) mixing the polycarbonate, 1 / 2 of triethanolamine, 1 / 2 of a compatibilizer, benzotriazole, melamine, and polytetrafluoroethylene to obtain a first mixture;

[0084] The epoxidized silicone rubber, 1 / 2 of triethanolamine, 1 / 2 of a compatibilizer, antioxidant 1010, light stabilizer TH-944, and sodium hydroxide are mixed to obtain a second mixture;

[0085] (2) The first mixed material and the second mixed material are mixed, and then added into an extruder, extruded at 220-280° C. and 400 rpm, and granulated to obtain the product.

[0086] The compatibilizer is obtained by copolymerizing acrylamide, styrene and propenyltrichlorosilane in a weight ratio of 5:4:1. The preparation method of the compatibilizer is as follows:

[0087] S1: 1 / 3 acrylamide and 1 / 2 styrene are added to a solvent, followed by the addition of an initiator (benzoyl peroxide and azobisisobutyronitrile in a weight ratio of 1:1) at 2.5% of the total weight of acrylamide, styrene, and allyltrichlorosilane and sodium dodecylbenzenesulfonate at 2% of the total weight of acrylamide, styrene, and allyltrichlorosilane, and the reaction is carried out at 70° C. for 2.5 h to obtain a prepolymer;

[0088] S2: adding the remaining acrylamide, styrene and propenyltrichlorosilane to the prepolymer, continuing the reaction at the same temperature for 4 hours, then raising the temperature to 95° C. to react for 1 hour, discharging, filtering, washing and drying to obtain the compatibilizing agent.

[0089] Example 4

[0090] The difference between this embodiment and embodiment 3 is that melamine and [(6-oxo-6H-dibenzo[C,E][1,2]oxaphosphorin-6-yl)methyl]succinic acid in a weight ratio of 1:1 are used to replace melamine.

[0091] Example 5

[0092] The difference between this embodiment and embodiment 3 is that the compatibilizer is obtained by copolymerizing acrylamide, styrene and propenyltrichlorosilane in a weight ratio of 1:4:1.

[0093] Example 6

[0094] The difference between this embodiment and embodiment 3 is that the compatibilizing agent is obtained by copolymerizing acrylamide and styrene in a weight ratio of 5:4.

[0095] Example 7

[0096] The difference between this embodiment and embodiment 3 is that allyldimethylsilane is used instead of propenyltrichlorosilane.

[0097] Comparative Example 1

[0098] The difference between this comparative example and Example 3 is that unepoxidized phenyl silicone rubber is used, and the unepoxidized phenyl silicone rubber is prepared using the preparation method of Example 1

[0041] to

[0045] of CN110358091B.

[0099] Comparative Example 2

[0100] The difference between this comparative example and Example 3 is that the amount of the epoxidized silicone rubber is 25 parts.

[0101] Test Example 1

[0102] The composite materials of the above examples and comparative examples were used to prepare test specimens using an injection molding machine. The following tests were performed on the specimens. The test results are shown in Table 1.

[0103] 1. Tensile strength: Tested in accordance with GB / T 1040;

[0104] 2. Impact strength: tested in accordance with ISO179-1;

[0105] 3. Heat deformation temperature: Tested in accordance with GB1634;

[0106] 4. Oxygen index: tested in accordance with GB / T 2406.2-2009.

[0107] Table 1

[0108]

[0109] According to the test data of Examples 1-3, the greater the amount of epoxidized silicone rubber added, the lower the tensile strength and heat deformation temperature, but the higher the impact strength and oxygen index. Moreover, according to the comparison between Example 3 and Comparative Example 2, it can be seen that by controlling the amount of epoxidized silicone rubber added, the negative effects of silicone rubber on tensile strength and heat deformation temperature can be balanced.

[0110] Test Example 2

[0111] The composite materials of the above examples and comparative examples were used to prepare test specimens using an injection molding machine. The specimens were immersed in 50% sulfuric acid and 5% sodium hydroxide solutions for 10 hours, respectively. The tensile strength of the treated specimens was then tested using the tensile strength test method of Example 1 to reduce the tensile strength decrease rate. The test results are shown in Table 2.

[0112] Table 2

[0113]

[0114] According to the above data, the composite material of the present application has good anti-corrosion effect and can be used in highly corrosive usage scenarios, thereby improving the use demand of the composite material in corrosive environments.

[0115] Test Example 3

[0116] The composite materials of the above examples and comparative examples were used to prepare test specimens using an injection molding machine. The specimens were placed at -50°C and 100°C for 10 hours, respectively, and then the tensile strength after treatment was tested using the tensile strength test method of Example 1 to reduce the tensile strength decrease rate. The test results are shown in Table 3.

[0117] Table 3

[0118]

[0119]

[0120] According to the above test data, after the sample strips made of the composite material of the present application are subjected to ultra-low temperature and high temperature treatment, the mechanical strength of the material will decrease. However, since the epoxidized silicone rubber can react with the compatibility additive, the mechanical performance decreases slightly and can meet the requirements for construction.

[0121] The foregoing is merely an embodiment of the present application, and the scope of protection of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the technical ideas and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A heat-resistant, flame-retardant, and corrosion-resistant composite material for construction, characterized in that: Calculated by weight, including: 60-80 parts of polycarbonate, 8-10 parts of dispersant, 10-20 parts of epoxidized silicone rubber, 1-5 parts of benzotriazole, 1-5 parts of flame retardant, 3-5 parts of compatibilizer, 0.3-0.5 parts of antioxidant, 0.2-0.5 parts of light stabilizer, 0.15-0.3 parts of anti-dripping agent, and 0.2-0.4 parts of catalyst.

2. The composite material according to claim 1, characterized in that The epoxidized silicone rubber is epoxidized phenyl silicone rubber.

3. The composite material according to claim 2, characterized in that The epoxidized phenyl silicone rubber has a vinyl content of 10-20% and a phenyl content of 10-25%.

4. The composite material according to claim 1, characterized in that The compatibilizer is obtained by copolymerizing acrylamide, styrene and allylsilane in a weight ratio of (3-5): (3-4):

1.

5. The composite material according to claim 4, characterized in that The allylsilane is selected from at least one of allyldimethylsilane, propenyltrichlorosilane, allyl(chloromethyl)dimethylsilane and trimethylallyloxysilane.

6. The composite material according to claim 1, characterized in that The flame retardant is selected from nitrogen-containing flame retardants or phosphorus-containing flame retardants.

7. The composite material according to claim 1, characterized in that The dispersant is selected from at least one of sodium silicate, sodium metasodium hexaphosphate and triethanolamine; The antioxidant is selected from at least one of antioxidant 168, antioxidant 1010, and antioxidant 1076; The light stabilizer is selected from poly[1-(2'-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidinyl succinate] or poly[[6-[(1,1,3,3-tetramethylbutyl)amine]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imine]-1,6-dihexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imine]]]; The anti-dripping agent is selected from polytetrafluoroethylene or anti-dripping agent SN3310; The catalyst is selected from at least one of triethylamine, zinc chloride and sodium hydroxide.

8. The method for preparing the composite material according to any one of claims 1 to 7, characterized in that: The steps include: (1) mixing the polycarbonate, 1 / 2 of a dispersant, 1 / 2 of a compatibilizer, benzotriazole, a flame retardant, and an anti-dripping agent to obtain a first mixture; The epoxidized silicone rubber, 1 / 2 of the dispersant, 1 / 2 of the compatibilizer, an antioxidant, a light stabilizer and a catalyst are mixed to obtain a second mixture; (2) The first mixed material and the second mixed material are mixed, and then added into an extruder, extruded, and granulated to obtain the product.

9. The preparation method according to claim 8, characterized in that The extruder is a twin-screw extruder, and the extrusion temperature of the twin-screw extruder is 220-280° C. and the rotation speed is 200-500 rpm.

10. Use of the composite material according to any one of claims 1 to 7 in building materials.

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