Composite material, method for producing same, and use thereof

Abstract

The application discloses a composite material and a preparation method and application thereof, and relates to the technical field of high polymer materials. The composite material comprises a polymer, glass fibers, silicone and an antioxidant. The composite material provided by the application has excellent mechanical properties, flame-retardant properties and surface plating capability, and has wide application prospects in the fields of new energy vehicles, electronic appliances, buildings, military industry and the like and in extreme environments such as a wide temperature range.

Description

Composite materials, their preparation methods, and applications Technical Field

[0001] This application relates to the field of polymer materials technology, and in particular to a composite material and its preparation method and application. Background Technology

[0002] Polycarbonate (PC), one of the five major engineering plastics, boasts advantages such as high transparency, high impact strength, high dimensional stability, and strong flame retardancy, making it widely used in industries such as electronics, automotive manufacturing, and optical manufacturing. However, PC's inherent V-2 flame retardancy and its tendency to become brittle and easily break at -15°C make it unsuitable for high-end applications such as new energy vehicles, high-end consumer electronics, and military applications.

[0003] Electroplating a metal layer onto a PC substrate surface can achieve a high-strength and lightweight fusion. The metal plating provides additional wear resistance (reducing surface scratches), UV protection (blocking over 90% of UV radiation), and electromagnetic shielding (suitable for 5G devices), while also improving chemical resistance (resistance to greases, dilute acids, etc.), resulting in products that are both aesthetically pleasing and practical. However, due to the inertness of PC's surface molecules and their tightly packed molecular chains, it is difficult to roughen the surface through etching, leading to poor adhesion between the plating layer and the PC substrate. Typically, PC needs to be blended (e.g., using a PC / ABS alloy) to improve the electroplating capability of the PC substrate. While the addition of ABS components improves the surface activity of the material, it reduces the impact strength and heat resistance of pure PC, limiting its application in extreme environments. Summary of the Invention

[0004] In view of this, this application provides a composite material, its preparation method, and its application.

[0005] The embodiments of this application are implemented as follows: Firstly, the embodiments of this application provide a composite material, the composite material comprising a polymer, glass fiber, silicone, and an antioxidant, wherein the polymer has the following structural formula: ;

[0006] Where m represents the degree of aggregation, selected from any integer from 20 to 100; n represents the degree of aggregation, selected from any integer from 150 to 200;

[0007] R is , a represents the molar content, which is 55%~65%, b represents the molar content, which is 20%~25%, c represents the molar content, which is 15%~20%; p represents the degree of polymerization, which is any integer from 50 to 100;

[0008] w represents the molar content, which is 77%~90%; x represents the molar content, which is 2%~5%; y represents the molar content, which is 1%~2%; z represents the molar content, which is 1%~2%.

[0009] Optionally, in some embodiments of this application, the composite material contains, by weight, 73.9 to 84.4 parts of polymer, 15 to 25 parts of glass fiber, 0.3 to 0.5 parts of silicone, and 0.3 to 0.6 parts of antioxidant.

[0010] Optionally, in some embodiments of this application, the glass fiber is a glass fiber modified with 3-mercaptopropyltrimethoxysilane;

[0011] The glass fiber is chopped glass fiber.

[0012] Optionally, in some embodiments of this application, the antioxidant includes a first antioxidant and a second antioxidant; wherein,

[0013] The first antioxidant is selected from one or more of antioxidant 1076, antioxidant 1010, antioxidant 1098, and antioxidant 1024;

[0014] The second antioxidant is selected from one or more of JYANO-168, antioxidant 923, antioxidant 2013, and antioxidant 1001;

[0015] By weight, the first antioxidant in the composite material is 0.2 to 0.4 parts, and the second antioxidant is 0.1 to 0.2 parts.

[0016] Secondly, embodiments of this application also provide a method for preparing a composite material.

[0017] We provide polymers, glass fibers, silicones, and antioxidants;

[0018] The polymer, glass fiber, silicone and antioxidant are mixed and reacted to obtain a composite material.

[0019] The polymer has the following structural formula: ;

[0020] Where m represents the degree of aggregation, selected from any integer from 20 to 100; n represents the degree of aggregation, selected from any integer from 150 to 200;

[0021] R is , a represents the molar content, which is 55%~65%, b represents the molar content, which is 20%~25%, c represents the molar content, which is 15%~20%; p represents the degree of polymerization, which is any integer from 50 to 100;

[0022] w represents the molar content, which is 77%~90%; x represents the molar content, which is 2%~5%; y represents the molar content, which is 1%~2%; z represents the molar content, which is 1%~2%.

[0023] Optionally, in some embodiments of this application, the method for preparing the polymer includes:

[0024] A first mixture and a second mixture are provided. The first mixture includes bisphenol A, flame retardant ODOPB, alkalinity regulator and a first solvent. The second mixture includes triphosgene and a second solvent. The first mixture and the second mixture are mixed to carry out a first reaction to obtain a prepolymer mixture, wherein the prepolymer mixture includes a prepolymer.

[0025] A third mixture is provided, comprising hydroxyl-terminated polydimethylsiloxane, hydroxyl-terminated polybutadiene, and a third solvent. The third mixture and the prepolymer mixture are mixed to carry out a second reaction to obtain a polymer.

[0026] Optionally, in some embodiments of this application, the first solvent, the second solvent, and the third solvent are each independently selected from one or more of deionized water, dichloromethane, chloroform, 1,2-dichloroethane, and tetrachloroethylene;

[0027] The alkalinity regulator is selected from one or more of sodium hydroxide, potassium hydroxide, and lithium hydroxide;

[0028] In the first mixture, the molar concentration of bisphenol A is 1 mol / L to 3 mol / L;

[0029] In the first mixture, the molar concentration of the flame retardant ODOPB is 0.01 mol / L to 0.1 mol / L;

[0030] In the first mixture, the molar concentration of the alkaline regulator is 1 mol / L to 5 mol / L;

[0031] In the second mixture, the molar concentration of the triphosgene is 1 mol / L to 2 mol / L;

[0032] In the third mixture, the molar concentration of the double-hydroxyl-terminated polydimethylsiloxane is 0.01 mol / L to 0.1 mol / L;

[0033] In the third mixture, the molar concentration of the hydroxyl-terminated polybutadiene is 0.01 mol / L to 0.1 mol / L;

[0034] The molar ratio of bisphenol A, flame retardant ODOPB, triphosgene, hydroxyl-terminated polydimethylsiloxane, and hydroxyl-terminated polybutadiene is (1~3):(0.01~0.15):(0.36~1.15):(0.01~0.06):(0.01~0.06).

[0035] The reaction temperature of the first reaction is 20℃~30℃, and the reaction time of the first reaction is 0.5h~3h;

[0036] The reaction temperature of the second reaction is 20℃~30℃; the reaction time of the second reaction is 0.5h~3h.

[0037] Optionally, in some embodiments of this application, the glass fiber is a 3-mercaptopropyltrimethoxysilane-modified glass fiber, and the preparation method of the 3-mercaptopropyltrimethoxysilane-modified glass fiber includes: providing a fourth mixture, the fourth mixture comprising unmodified glass fiber and a fourth solvent; providing 3-mercaptopropyltrimethoxysilane; mixing the 3-mercaptopropyltrimethoxysilane and the fourth mixture; and carrying out a third reaction to obtain the 3-mercaptopropyltrimethoxysilane-modified glass fiber; wherein,

[0038] The unmodified glass fiber is chopped glass fiber;

[0039] The fourth solvent is selected from one or more of ethyl acetate, methyl acetate, butyl acetate, and isopropyl acetate;

[0040] In the fourth mixture, the mass concentration of the unmodified glass fiber is 300 g / L to 400 g / L;

[0041] The mass ratio of the unmodified glass fiber to the 3-mercaptopropyltrimethoxysilane is (300~400):(6~7);

[0042] The reaction temperature of the third reaction is 20℃~30℃, and the reaction time of the third reaction is 0.5h~3h.

[0043] Optionally, in some embodiments of this application, the antioxidant includes a first antioxidant and a second antioxidant; the first antioxidant is selected from one or more of antioxidant 1076, antioxidant 1010, antioxidant 1098, and antioxidant 1024; the second antioxidant is selected from one or more of JYANO-168, antioxidant 923, antioxidant 2013, and antioxidant 1001.

[0044] By weight, the polymer comprises 73.9 to 84.4 parts, the glass fiber comprises 15 to 25 parts, the silicone comprises 0.3 to 0.5 parts, the first antioxidant comprises 0.2 to 0.4 parts, and the second antioxidant comprises 0.1 to 0.2 parts.

[0045] The reaction of the polymer, the glass fiber, the silicone and the antioxidant includes: melt extrusion granulation; the conditions for melt extrusion granulation are: temperature of 150℃~300℃, screw speed of 200r / min~500r / min, and length-to-diameter ratio of (40~50):1.

[0046] Thirdly, embodiments of this application also provide an application of the above-mentioned composite material or the composite material prepared by the above-mentioned preparation method in the fields of new energy vehicles, electronic appliances, construction, and military industry.

[0047] The composite material provided in this application includes the polymer and glass fiber shown in the above structural formula. Through the chemical structure design of polycarbonate, a multi-component copolymer PC (polymer) is provided. Bisphenol A, as the main dihydroxyl unit, provides basic mechanical strength and rigidity; hydroxyl-terminated polydimethylsiloxane (PDMS) acts as a toughening unit, providing low-temperature toughness; the reactive phosphorus-based flame retardant ODOPB synergistically enhances the intrinsic flame retardant properties of PC with PDMS; hydroxyl-terminated polybutadiene (HTPB) enhances the low-temperature toughness of PC while strengthening its etching ability. After roughening treatment, it can efficiently anchor surface metal coatings, giving PC excellent electroplating capabilities. Silicone can improve the chemical stability and high-temperature resistance of the composite material; antioxidants can improve the oxidation resistance of the composite material, thereby improving its stability. Through the combination of polymer, glass fiber, silicone, and antioxidants, the composite material provided in this application has excellent mechanical properties, flame retardant properties, and surface electroplating capabilities, and has broad application prospects in new energy vehicles, electronics, construction, military industries, and extreme environments with wide temperature ranges. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 is a flowchart of a method for preparing a composite material according to an embodiment of this application;

[0050] Figure 2 is an infrared spectrum of the polymer provided in Example 3 of this application;

[0051] Figure 3 is a sample image of the injection molded part of the composite material provided in Example 3 of this application after electroplating. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application.

[0053] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operating state, specifically the orientation shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative purposes and do not impose numerical requirements or establish a numerical order.

[0054] In this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0055] In this application, "at least one" means one or more, and "more than one" means two or more. "One or more", "at least one of the following", or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0056] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0057] The structural formulas and molecular weights of some of the chemical reagents used in this application are described below:

[0058] Bisphenol A: Molecular weight = 228.29;

[0059] Three Lights: Molecular weight = 296.75;

[0060] Flame retardant ODOPB: Molecular weight = 324.27;

[0061] Hydroxyl-terminated polydimethylsiloxane (HO-PDMS-OH): Where m represents the degree of polymerization of PDMS, which is an integer from 20 to 100, and the number average molecular weight of the hydroxyl-terminated polydimethylsiloxane is 2000.

[0062] Hydroxyl-terminated polybutadiene (HTPB): HTPB-4200 was purchased from Tianyuan Aviation Materials (Yingkou) Technology Co., Ltd., where a corresponds to the content of 1,4-cis structure, approximately 60%; b corresponds to the content of 1,2-vinyl structure, approximately 20%~25%; c corresponds to the content of 1,4-trans structure, approximately 15%~20%; p represents the degree of polymerization of hydroxyl-terminated polybutadiene (HTPB), which is an integer from 50 to 100, and its number average molecular weight is 4200.

[0063] 3-Mercaptopropyltrimethoxysilane: Molecular weight = 196.34.

[0064] The technical solution of this application is as follows:

[0065] In a first aspect, embodiments of this application provide a composite material. The composite material includes a polymer, glass fiber, silicone, and an antioxidant, wherein the polymer has the following structural formula:

[0066] ;

[0067] Where m represents the degree of aggregation, selected from any integer from 20 to 100; n represents the degree of aggregation, selected from any integer from 150 to 200;

[0068] R is , a represents the molar content, which is 55%~65%, b represents the molar content, which is 20%~25%, c represents the molar content, which is 15%~20%; p represents the degree of polymerization, which is any integer from 50 to 100;

[0069] w represents the molar content, which is 77%~90%; x represents the molar content, which is 2%~5%; y represents the molar content, which is 1%~2%; z represents the molar content, which is 1%~2%.

[0070] The composite material provided in this application includes the polymer and glass fiber shown in the above structural formula. Through the chemical structure design of polycarbonate, a multi-component copolymer PC (polymer) is provided. Bisphenol A, as the main dihydroxyl unit, provides basic mechanical strength and rigidity; hydroxyl-terminated polydimethylsiloxane (PDMS) acts as a toughening unit, providing low-temperature toughness; the reactive phosphorus-based flame retardant ODOPB synergistically enhances the intrinsic flame retardant properties of PC with PDMS; hydroxyl-terminated polybutadiene (HTPB) enhances the low-temperature toughness of PC while strengthening its etching ability. After roughening treatment, it can efficiently anchor surface metal coatings, giving PC excellent electroplating capabilities. Silicone can improve the chemical stability and high-temperature resistance of the composite material; antioxidants can improve the oxidation resistance of the composite material, thereby improving its stability. Through the combination of polymer, glass fiber, silicone, and antioxidants, the composite material provided in this application has excellent mechanical properties, flame retardant properties, and surface electroplating capabilities, and has broad application prospects in new energy vehicles, electronics, construction, military industries, and extreme environments with wide temperature ranges.

[0071] In some embodiments, the glass fiber is a 3-mercaptopropyltrimethoxysilane-modified glass fiber. In the composite material, the 3-mercaptopropyltrimethoxysilane-modified glass fiber can undergo an addition reaction with the side chain double bonds in the HTPB unit of the polymer, thereby forming a strong chemical bond between the glass fiber and the polymer, enhancing the interfacial bonding between the two, and improving its mechanical properties.

[0072] In some embodiments, the glass fiber is chopped glass fiber. Chopped glass fiber, also known as chopped glass fiber precursor, is a reinforcing material made by melting quartz sand at high temperature, drawing it into precursor fibers with a special sizing agent, and then cutting it into short strands online using a wet process or by cutting finished products.

[0073] In some embodiments, by weight, the polymer in the composite material comprises 73.9 to 84.4 parts, for example, 73.9, 75, 78, 80, 82, 84.4 parts, or any range between any two of the above values; the glass fiber comprises 15 to 25 parts, for example, 15, 16, 18, 20, 22, 25 parts, or any range between any two of the above values; the silicone comprises 0.3 to 0.5 parts, for example, 0.3, 0.4, 0.5 parts, or any range between any two of the above values; and the antioxidant comprises 0.3 to 0.6 parts, for example, 0.3, 0.4, 0.5, 0.6 parts, or any range between any two of the above values. Within the range of the proportions of each component, the polymer can be combined with the glass fiber, the silicone, and the antioxidant to improve the performance of the composite material.

[0074] In some embodiments, the antioxidant includes a first antioxidant and a second antioxidant, wherein the first antioxidant is selected from one or more of antioxidant 1076, antioxidant 1010, antioxidant 1098, and antioxidant 1024, and the second antioxidant is selected from one or more of JYANO-168, antioxidant 923, antioxidant 2013, and antioxidant 1001.

[0075] Furthermore, based on parts by weight, the first antioxidant in the composite material comprises 0.2 to 0.4 parts, for example, 0.2, 0.3, 0.4 parts, or any range between two of the above values; the second antioxidant comprises 0.1 to 0.2 parts, for example, 0.1, 0.12, 0.15, 0.18, 0.2 parts, or any range between two of the above values. Within the aforementioned range of component proportions, the first antioxidant and the second antioxidant can interact with the polymer, the glass fiber, and the silicone to improve the antioxidant properties and stability of the composite material.

[0076] Secondly, referring to Figure 1, this application provides a method for preparing a composite material, including the following steps:

[0077] Step S11: Provide polymer, glass fiber, silicone and antioxidant;

[0078] Step S12: Mix the polymer, the glass fiber, the silicone and the antioxidant, and react to obtain a composite material.

[0079] The polymer has the following structural formula: ;

[0080] Where m represents the degree of aggregation, selected from any integer from 20 to 100; n represents the degree of aggregation, selected from any integer from 150 to 200;

[0081] R is , a represents the molar content, which is 55%~65%, b represents the molar content, which is 20%~25%, c represents the molar content, which is 15%~20%; p represents the degree of polymerization, which is any integer from 50 to 100;

[0082] w represents the molar content, which is 77%~90%; x represents the molar content, which is 2%~5%; y represents the molar content, which is 1%~2%; z represents the molar content, which is 1%~2%.

[0083] In step S11:

[0084] In some embodiments, the method for preparing the polymer includes:

[0085] Step S111: Provide a first mixture and a second mixture, wherein the first mixture includes bisphenol A, flame retardant ODOPB, alkalinity regulator and a first solvent, and the second mixture includes triphosgene and a second solvent. Mix the first mixture and the second mixture to carry out a first reaction to obtain a prepolymer mixture, wherein the prepolymer mixture includes a prepolymer.

[0086] Step S112: Provide a third mixture, which includes hydroxyl-terminated polydimethylsiloxane, hydroxyl-terminated polybutadiene, and a third solvent. Mix the third mixture with the prepolymer mixture to carry out a second reaction and obtain a polymer.

[0087] In some embodiments, the first solvent, the second solvent, and the third solvent are each independently selected from one or more of deionized water, dichloromethane, chloroform, 1,2-dichloroethane, and tetrachloroethylene.

[0088] In some embodiments, the molar concentration of bisphenol A in the first mixture is 1 mol / L to 3 mol / L, for example, it can be 1 mol / L, 1.5 mol / L, 2 mol / L, 2.5 mol / L, 3 mol / L, or any range between two of the above values. Within this molar concentration range, uniform dissolution and dispersion of bisphenol A is beneficial.

[0089] In some embodiments, the molar concentration of the flame retardant ODOPB in the first mixture is 0.01 mol / L to 0.1 mol / L, for example, it can be 0.01 mol / L, 0.02 mol / L, 0.05 mol / L, 0.08 mol / L, 0.1 mol / L, or any range between two of the above values. Within this molar concentration range, uniform dissolution and dispersion of the flame retardant ODOPB are beneficial.

[0090] In some embodiments, the molar concentration of the alkaline regulator in the first mixture is 1 mol / L to 5 mol / L, for example, it can be 1 mol / L, 2 mol / L, 3 mol / L, 4 mol / L, 5 mol / L, or any range between two of the above values. Within this molar concentration range, it is beneficial for the uniform dissolution and dispersion of the alkaline regulator, and also beneficial for the alkaline regulator to adjust a suitable pH, promoting subsequent reactions.

[0091] In some embodiments, the alkalinity regulator is selected from one or more of sodium hydroxide, potassium hydroxide, and lithium hydroxide.

[0092] In some embodiments, the molar concentration of triphosgene in the second mixture is 1 mol / L to 2 mol / L, for example, it can be 1 mol / L, 1.2 mol / L, 1.5 mol / L, 1.8 mol / L, 2 mol / L, or any range between two of the above values. Within this molar concentration range, uniform dissolution and dispersion of the triphosgene are beneficial.

[0093] In some embodiments, the molar ratio of bisphenol A, the flame retardant ODOPB, and the triphosgene is (1~3):(0.01~0.15):(0.36~1.15), for example, it can be 1:0.1:0.36, 2:0.01:0.7, 3:0.06:1.1, 1.5:0.02:0.55, 2.5:0.05:0.9, or any range between two of the above ratios. Within the range of the molar ratio, it is beneficial to improve the reaction yield of bisphenol A, the flame retardant ODOPB, and the triphosgene.

[0094] In some embodiments, mixing the first mixture and the second mixture includes adding the second mixture dropwise to the first mixture.

[0095] Further, the second mixture is added dropwise to the first mixture under ice bath conditions.

[0096] In some embodiments, the reaction temperature of the first reaction is 20°C to 30°C, for example, it can be 20°C, 22°C, 25°C, 28°C, 30°C, or any range between two of the above values; the reaction time of the first reaction is 0.5h to 3h, for example, it can be 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, or any range between two of the above values. Thus, under the reaction conditions of the first reaction, it is beneficial to efficiently generate the prepolymer.

[0097] In some embodiments, the prepolymer has the following structural formula:

[0098] ;

[0099] Where q represents the degree of polymerization, selected from any integer from 10 to 15; w represents the molar content, which is 77% to 90%; and x represents the molar content, which is 2% to 5%.

[0100] In some embodiments, the molar concentration of the hydroxyl-terminated polydimethylsiloxane in the third mixture is 0.01 mol / L to 0.1 mol / L, for example, it can be 0.01 mol / L, 0.02 mol / L, 0.05 mol / L, 0.08 mol / L, 0.1 mol / L, or any range between two of the above values. Within this molar concentration range, uniform dissolution and dispersion of the hydroxyl-terminated polydimethylsiloxane are beneficial.

[0101] In some embodiments, the molar concentration of the hydroxyl-terminated polybutadiene in the third mixture is 0.01 mol / L to 0.1 mol / L, for example, it can be 0.01 mol / L, 0.02 mol / L, 0.05 mol / L, 0.08 mol / L, 0.1 mol / L, or any range between two of the above values. Within this molar concentration range, uniform dissolution and dispersion of the hydroxyl-terminated polybutadiene are beneficial.

[0102] In some embodiments, the molar ratio of bisphenol A, the dihydroxy-terminated polydimethylsiloxane, and the hydroxyl-terminated polybutadiene is (1~3):(0.01~0.06):(0.01~0.06), for example, it can be 1:0.01:0.01, 2:0.03:0.04, 3:0.06:0.03, 1.5:0.02:0.025, 2.5:0.05:0.04, or any range between two of the above ratios. Within the range of the molar ratio, it is beneficial to improve the reaction yield of the prepolymer, the dihydroxy-terminated polydimethylsiloxane, and the hydroxyl-terminated polybutadiene.

[0103] In some embodiments, mixing the third mixture and the prepolymer mixture includes adding the third mixture dropwise to the prepolymer mixture.

[0104] In some embodiments, the reaction temperature of the second reaction is 20°C to 30°C, for example, 20°C, 22°C, 25°C, 28°C, 30°C, or any range between two of the above values; the reaction time of the second reaction is 0.5h to 3h, for example, 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, or any range between two of the above values. Thus, under the reaction conditions of the second reaction, it is advantageous to carry out the chain extension reaction to generate the polymer.

[0105] It should be noted that after mixing the third mixture and the prepolymer mixture and carrying out the second reaction, the aqueous phase and the organic phase can be separated by a separatory funnel. The organic phase is repeatedly washed with deionized water until the pH is 7-8. Then, the organic phase is poured into excess methanol for precipitation to obtain the polymer.

[0106] This application employs a safer and more environmentally friendly triphosgene method to synthesize multi-component copolymer PC (polymer). Bisphenol A serves as the main dihydroxyl unit, providing basic mechanical strength and rigidity. Hydroxyl-terminated polydimethylsiloxane (PDMS) acts as a toughening unit, providing low-temperature toughness. The reactive phosphorus-based flame retardant ODOPB synergistically enhances the intrinsic flame retardant properties of PC with PDMS. Hydroxyl-terminated polybutadiene (HTPB) improves the low-temperature toughness of PC while enhancing its etching ability. After roughening treatment, it can efficiently anchor the surface metal coating, giving PC excellent electroplating capabilities.

[0107] In some embodiments, the glass fiber is a glass fiber modified with 3-mercaptopropyltrimethoxysilane.

[0108] Furthermore, the method for preparing the 3-mercaptopropyltrimethoxysilane-modified glass fiber includes:

[0109] Step S113: Provide a fourth mixture, the fourth mixture comprising unmodified glass fibers and a fourth solvent;

[0110] Step S114: Provide 3-mercaptopropyltrimethoxysilane, mix the 3-mercaptopropyltrimethoxysilane with the fourth mixture, and carry out the third reaction to obtain glass fiber modified with 3-mercaptopropyltrimethoxysilane.

[0111] In some embodiments, the unmodified glass fiber is chopped glass fiber.

[0112] In some embodiments, the fourth solvent is selected from one or more of ethyl acetate, methyl acetate, butyl acetate, and isopropyl acetate.

[0113] In some embodiments, the mass concentration of the unmodified glass fiber in the fourth mixture is 300 g / L to 400 g / L, for example, it can be 300 g / L, 320 g / L, 350 g / L, 380 g / L, 400 g / L, or any range between two of the above values. Within this mass concentration range, uniform dissolution and dispersion of the unmodified glass fiber is beneficial.

[0114] In some embodiments, the mass ratio of the unmodified glass fiber to the 3-mercaptopropyltrimethoxysilane is (300~400):(6~7), for example, it can be 300:6, 400:6.2, 350:6.2, 380:6.5, 330:7, or any range between two of the above ratios. Within the range of the stated mass ratio, it is beneficial to promote suitable modification of the unmodified glass fiber by the 3-mercaptopropyltrimethoxysilane.

[0115] In some embodiments, the reaction temperature of the third reaction is 20°C to 30°C, for example, 20°C, 22°C, 25°C, 28°C, 30°C, or any range between two of the above values; the reaction time of the third reaction is 0.5h to 3h, for example, 0.5h, 1h, 1.5h, 2h, 2.5h, 3h, or any range between two of the above values. Thus, under the reaction conditions of the third reaction, it is beneficial to efficiently generate the 3-mercaptopropyltrimethoxysilane-modified glass fiber.

[0116] The silicone and antioxidants mentioned above will not be repeated here.

[0117] In step S12:

[0118] In some embodiments, the polymer comprises 73.9 to 84.4 parts by weight, the glass fiber comprises 15 to 25 parts by weight, the silicone comprises 0.3 to 0.5 parts by weight, the first antioxidant comprises 0.2 to 0.4 parts by weight, and the second antioxidant comprises 0.1 to 0.2 parts by weight. Within the range of the parts of each component, the components work together to improve the performance of the composite material.

[0119] In some embodiments, the reaction of the polymer, the glass fiber, the silicone, and the antioxidant includes melt extrusion granulation. The melt extrusion granulation may be performed using a twin-screw extruder.

[0120] Furthermore, the conditions for melt extrusion granulation are as follows: the temperature is 150℃~300℃, for example, it can be 150℃, 200℃, 250℃, 300℃ or any range between two values; the screw speed is 200r / min~500r / min, for example, it can be 200r / min, 250r / min, 300r / min, 350r / min, 400r / min, 450r / min, 5200r / min or any range between two values; the length-to-diameter ratio is (40~50):1, for example, it can be 40:1, 42:1, 45:1, 48:1, 50:1 or any range between two of the above ratios.

[0121] Thus, under the conditions of melt extrusion granulation, the polymer, glass fiber, silicone and antioxidant are better able to be fully mixed and reacted to obtain a high-performance composite material.

[0122] Thirdly, embodiments of this application also provide applications of the above-described composite material or the composite material prepared by the above-described preparation method.

[0123] Specifically, the aforementioned composite materials possess excellent mechanical properties, flame retardant properties, and the ability to be electroplated, and have broad application prospects in fields such as new energy vehicles, electronics, construction, military industry, and extreme environments such as wide temperature ranges.

[0124] The present application will be specifically described below through specific embodiments. These embodiments are only some embodiments of the present application and are not intended to limit the present application. Embodiment 1

[0125] This embodiment provides a composite material, the preparation method of which includes the following steps:

[0126] Step 1a: Weigh 0.97 mol bisphenol A, 0.03 mol flame retardant ODOPB, 2 mol sodium hydroxide, and 500 mL deionized water into a 1000 mL three-necked flask. Start stirring at 100 rpm until the reactants are completely dissolved to obtain the first mixture. Purge with flowing nitrogen for protection. Dissolve 0.35 mol triphosgene in 200 mL dichloromethane to obtain the second mixture. Under ice bath conditions, add the second mixture dropwise to the first mixture in the three-necked flask using a constant pressure funnel over approximately 1 hour. After the addition is complete, maintain stirring for 0.5 hours. Raise the reaction temperature to 25°C, adjust the stirring speed to 300 rpm, and continue the reaction for 1 hour to obtain a prepolymer mixture. The prepolymer mixture contains a prepolymer, the structural formula of which is shown below: ;

[0127] Step 2a: Weigh 0.01 mol of dihydroxyl-terminated polydimethylsiloxane, 0.01 mol of hydroxyl-terminated polybutadiene, and 200 mL of dichloromethane into a 500 mL beaker. Stir until homogeneous to obtain a third mixture. At 25°C, add the third mixture dropwise to the prepolymer mixture obtained in Step 1a through a constant pressure funnel. After the addition is complete, continue stirring and carry out the chain extension reaction for 1 hour. After the reaction is complete, separate the aqueous phase and organic phase through a separatory funnel. Wash the organic phase repeatedly with deionized water until the pH is 7-8. Then, pour the organic phase into excess methanol for precipitation. Filter and dry to obtain the polymer. The structural formula of the polymer is shown below: ;

[0128] Step 3a: Take 100g of chopped glass fiber (4.5mm, purchased from Shandong Taicheng Fiber Co., Ltd.) and 300g of ethyl acetate and add them to a 1L beaker; mechanically stir and ultrasonically disperse at room temperature for 1h to obtain a uniform fourth mixture; then add 2g of 3-mercaptopropyltrimethoxysilane, keep mechanically stirring at 25℃ for 1h, filter, and dry to obtain chopped glass fiber with thiol groups on the surface;

[0129] Step 4a: Take 2.373 kg of the polymer obtained in Step 2a, 0.6 kg of short-cut glass fibers with thiol groups on the surface obtained in Step 3a, 12 g of silicone, 9 g of the first antioxidant 1076, and 6 g of the second antioxidant JYANO-168. Mix them evenly in a medium-speed mixer, and then melt-extrude and granulate them using a twin-screw extruder. The temperature zones of the extruder are set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃. The screw speed is 300 r / min, and the length-to-diameter ratio is 48:1. The composite material is obtained. Example 2

[0130] This embodiment provides a composite material, the preparation method of which includes the following steps:

[0131] Step 1b: Weigh 0.95 mol bisphenol A, 0.05 mol flame retardant ODOPB, 2 mol sodium hydroxide, and 500 mL deionized water into a 1000 mL three-necked flask. Start stirring at 100 rpm until the reactants are completely dissolved to obtain the first mixture. Purge with flowing nitrogen for protection. Dissolve 0.35 mol triphosgene in 200 mL dichloromethane to obtain the second mixture. Under ice bath conditions, add the second mixture dropwise to the first mixture in the three-necked flask using a constant pressure funnel over approximately 1 hour. After the addition is complete, maintain stirring for 0.5 hours. Raise the reaction temperature to 25°C, adjust the stirring speed to 300 rpm, and continue the reaction for 1 hour to obtain a prepolymer mixture. The prepolymer mixture contains a prepolymer, the structural formula of which is shown below:

[0132] ;

[0133] Step 2b: Weigh 0.01 mol of dihydroxyl-terminated polydimethylsiloxane, 0.01 mol of hydroxyl-terminated polybutadiene, and 200 mL of dichloromethane into a 500 mL beaker. Stir until homogeneous to obtain a third mixture. At 25°C, add the third mixture dropwise to the prepolymer mixture obtained in Step 1b through a constant pressure funnel. After the addition is complete, continue stirring and carry out the chain extension reaction for 1 hour. After the reaction is complete, separate the aqueous phase and organic phase through a separatory funnel. Wash the organic phase repeatedly with deionized water until the pH is 7-8. Then, pour the organic phase into excess methanol for precipitation. Filter and dry to obtain the polymer. The structural formula of the polymer is shown below:

[0134] ;

[0135] Step 3b: Take 100g of chopped glass fiber (4.5mm, purchased from Shandong Taicheng Fiber Co., Ltd.) and 300g of ethyl acetate and add them to a 1L beaker; mechanically stir and ultrasonically disperse at room temperature for 1h to obtain a uniform fourth mixture; then add 2g of 3-mercaptopropyltrimethoxysilane, keep mechanically stirring at 25℃ for 1h, filter, and dry to obtain chopped glass fiber with thiol groups on the surface;

[0136] Step 4b: Take 2.373 kg of the polymer obtained in Step 2b, 0.6 kg of short-cut glass fibers with thiol groups on the surface obtained in Step 3b, 12 g of silicone, 9 g of the first antioxidant 1076, and 6 g of the second antioxidant JYANO-168. Mix them evenly in a medium-speed mixer, and then melt-extrude and granulate them through a twin-screw extruder. The temperature zones of the extruder are set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃. The screw speed is 300 r / min, and the length-to-diameter ratio is 48:1 to obtain the composite material.

[0137] Example 3

[0138] This embodiment provides a composite material, the preparation method of which includes the following steps:

[0139] Step 1c: Weigh 0.97 mol bisphenol A, 0.03 mol flame retardant ODOPB, 2 mol sodium hydroxide, and 500 mL deionized water into a 1000 mL three-necked flask. Start stirring at 100 rpm until the reactants are completely dissolved to obtain the first mixture. Purge with flowing nitrogen for protection. Dissolve 0.35 mol triphosgene in 200 mL dichloromethane to obtain the second mixture. Under ice bath conditions, add the second mixture dropwise to the first mixture in the three-necked flask using a constant pressure funnel over approximately 1 hour. After the addition is complete, maintain stirring for 0.5 hours. Raise the reaction temperature to 25°C, adjust the stirring speed to 300 rpm, and continue the reaction for 1 hour to obtain a prepolymer mixture. The prepolymer mixture contains a prepolymer, the structural formula of which is shown below:

[0140] ;

[0141] Step 2c: Weigh 0.02 mol of dihydroxyl-terminated polydimethylsiloxane, 0.01 mol of dihydroxyl-terminated polybutadiene, and 200 mL of dichloromethane into a 500 mL beaker. Stir until homogeneous to obtain a third mixture. At 25°C, add the third mixture dropwise to the prepolymer mixture obtained in step 1c through a constant pressure funnel. After the addition is complete, continue stirring and carry out the chain extension reaction for 1 hour. After the reaction is complete, separate the aqueous phase and organic phase through a separatory funnel. Wash the organic phase repeatedly with deionized water until the pH is 7-8. Then, pour the organic phase into excess methanol for precipitation. Filter and dry to obtain the polymer. The structural formula of the polymer is shown below:

[0142] ;

[0143] Step 3c: Take 100g of chopped glass fiber (4.5mm, purchased from Shandong Taicheng Fiber Co., Ltd.) and 300g of ethyl acetate and add them to a 1L beaker; mechanically stir and ultrasonically disperse at room temperature for 1h to obtain a uniform fourth mixture; then add 2g of 3-mercaptopropyltrimethoxysilane, keep mechanically stirring at 25℃ for 1h, filter, and dry to obtain chopped glass fiber with thiol groups on the surface;

[0144] Step 4c: Take 2.373 kg of the polymer obtained in Step 2c, 0.6 kg of short-cut glass fibers with thiol groups on the surface obtained in Step 3c, 12 g of silicone, 9 g of the first antioxidant 1076, and 6 g of the second antioxidant JYANO-168. Mix them evenly in a medium-speed mixer, and then melt-extrude and granulate them using a twin-screw extruder. The temperature zones of the extruder are set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃. The screw speed is 300 r / min, and the length-to-diameter ratio is 48:1. The composite material is obtained. Example 4

[0145] This embodiment provides a composite material, the preparation method of which includes the following steps:

[0146] Step 1d: Weigh 0.95 mol bisphenol A, 0.05 mol flame retardant ODOPB, 2 mol sodium hydroxide, and 500 mL deionized water into a 1000 mL three-necked flask. Start stirring at 100 rpm until the reactants are completely dissolved to obtain the first mixture. Purge with flowing nitrogen for protection. Dissolve 0.35 mol triphosgene in 200 mL dichloromethane to obtain the second mixture. Under ice bath conditions, add the second mixture dropwise to the first mixture in the three-necked flask using a constant pressure funnel over approximately 1 hour. After the addition is complete, maintain stirring for 0.5 hours. Raise the reaction temperature to 25°C, adjust the stirring speed to 300 rpm, and continue the reaction for 1 hour to obtain a prepolymer mixture. The prepolymer mixture contains a prepolymer, the structural formula of which is shown below:

[0147] ;

[0148] Step 2d: Weigh 0.02 mol of dihydroxyl-terminated polydimethylsiloxane, 0.01 mol of dihydroxyl-terminated polybutadiene, and 200 mL of dichloromethane into a 500 mL beaker. Stir until homogeneous to obtain a third mixture. At 25°C, add the third mixture dropwise to the prepolymer mixture obtained in Step 1d through a constant pressure funnel. After the addition is complete, keep stirring and carry out the chain extension reaction for 1 hour. After the reaction is complete, separate the aqueous phase and organic phase through a separatory funnel. Wash the organic phase repeatedly with deionized water until the pH is 7-8. Then, pour the organic phase into excess methanol for precipitation. Filter and dry to obtain the polymer. The structural formula of the polymer is shown below:

[0149] ;

[0150] Step 3d: Take 100g of chopped glass fiber (4.5mm, purchased from Shandong Taicheng Fiber Co., Ltd.) and 300g of ethyl acetate and add them to a 1L beaker; mechanically stir and ultrasonically disperse at room temperature for 1h to obtain a uniform fourth mixture; then add 2g of 3-mercaptopropyltrimethoxysilane, keep mechanically stirring at 25℃ for 1h, filter, and dry to obtain chopped glass fiber with thiol groups on the surface;

[0151] Step 4d: Take 2.373 kg of the polymer obtained in Step 2d, 0.6 kg of short-cut glass fibers with thiol groups on the surface obtained in Step 3d, 12 g of silicone, 9 g of the first antioxidant 1076, and 6 g of the second antioxidant JYANO-168. Mix them evenly in a medium-speed mixer, and then melt-extrude and granulate them using a twin-screw extruder. The temperature zones of the extruder are set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃, the screw speed is 300 r / min, and the length-to-diameter ratio is 48:1 to obtain the composite material. Example 5

[0152] This embodiment provides a composite material, the preparation method of which includes the following steps:

[0153] Step 1e: Weigh 0.95 mol bisphenol A, 0.05 mol flame retardant ODOPB, 2 mol sodium hydroxide, and 500 mL deionized water into a 1000 mL three-necked flask. Start stirring at 100 rpm until the reactants are completely dissolved to obtain the first mixture. Purge with flowing nitrogen for protection. Dissolve 0.35 mol triphosgene in 200 mL dichloromethane to obtain the second mixture. Under ice bath conditions, add the second mixture dropwise to the first mixture in the three-necked flask using a constant pressure funnel over approximately 1 hour. After the addition is complete, maintain stirring for 0.5 hours. Raise the reaction temperature to 25°C, adjust the stirring speed to 300 rpm, and continue the reaction for 1 hour to obtain a prepolymer mixture. The prepolymer mixture contains a prepolymer, the structural formula of which is shown below:

[0154] ;

[0155] Step 2e: Weigh 0.01 mol of dihydroxyl-terminated polydimethylsiloxane, 0.02 mol of dihydroxyl-terminated polybutadiene, and 200 mL of dichloromethane into a 500 mL beaker. Stir until homogeneous to obtain a third mixture. At 25°C, add the third mixture dropwise to the prepolymer mixture obtained in step 1e through a constant pressure funnel. After the addition is complete, continue stirring and carry out the chain extension reaction for 1 hour. After the reaction is complete, separate the aqueous phase and organic phase through a separatory funnel. Wash the organic phase repeatedly with deionized water until the pH is 7-8. Then, pour the organic phase into excess methanol for precipitation. Filter and dry to obtain the polymer. The structural formula of the polymer is shown below:

[0156] ;

[0157] Step 3e: Take 100g of chopped glass fiber (4.5mm, purchased from Shandong Taicheng Fiber Co., Ltd.) and 300g of ethyl acetate and add them to a 1L beaker; mechanically stir and ultrasonically disperse at room temperature for 1h to obtain a uniform fourth mixture; then add 2g of 3-mercaptopropyltrimethoxysilane, keep mechanically stirring at 25℃ for 1h, filter, and dry to obtain chopped glass fiber with thiol groups on the surface;

[0158] Step 4e: Take 2.373 kg of the polymer obtained in Step 2e, 0.6 kg of short-cut glass fibers with thiol groups on the surface obtained in Step 3e, 12 g of silicone, 9 g of the first antioxidant 1076, and 6 g of the second antioxidant JYANO-168. Mix them evenly in a medium-speed mixer, and then melt-extrude and granulate them using a twin-screw extruder. The temperature zones of the extruder are set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃. The screw speed is 300 r / min, and the length-to-diameter ratio is 48:1. The composite material is obtained. Example 5

[0159] This embodiment provides a composite material, the preparation method of which includes the following steps:

[0160] Step 1f: Weigh 0.95 mol bisphenol A, 0.05 mol flame retardant ODOPB, 2 mol sodium hydroxide, and 500 mL deionized water into a 1000 mL three-necked flask. Start stirring at 100 rpm until the reactants are completely dissolved to obtain the first mixture. Purge with flowing nitrogen for protection. Dissolve 0.35 mol triphosgene in 200 mL dichloromethane to obtain the second mixture. Under ice bath conditions, add the second mixture dropwise to the first mixture in the three-necked flask using a constant pressure funnel over approximately 1 hour. After the addition is complete, maintain stirring for 0.5 hours. Raise the reaction temperature to 25°C, adjust the stirring speed to 300 rpm, and continue the reaction for 1 hour to obtain a prepolymer mixture. The prepolymer mixture contains a prepolymer, the structural formula of which is shown below.

[0161] ;

[0162] Step 2f: Weigh 0.02 mol of dihydroxyl-terminated polydimethylsiloxane, 0.02 mol of hydroxyl-terminated polybutadiene, and 200 mL of dichloromethane into a 500 mL beaker. Stir until homogeneous to obtain a third mixture. At 25°C, add the third mixture dropwise to the prepolymer mixture obtained in step 1f through a constant pressure funnel. After the addition is complete, continue stirring and carry out the chain extension reaction for 1 hour. After the reaction is complete, separate the aqueous phase and organic phase through a separatory funnel. Wash the organic phase repeatedly with deionized water until the pH is 7-8. Then, pour the organic phase into excess methanol for precipitation. Filter and dry to obtain the polymer. The structural formula of the polymer is shown below: ;

[0163] Step 3f: Take 100g of chopped glass fiber (4.5mm, purchased from Shandong Taicheng Fiber Co., Ltd.) and 300g of ethyl acetate and add them to a 1L beaker; mechanically stir and ultrasonically disperse at room temperature for 1h to obtain a uniform fourth mixture; then add 2g of 3-mercaptopropyltrimethoxysilane, keep mechanically stirring at 25℃ for 1h, filter, and dry to obtain chopped glass fiber with thiol groups on the surface;

[0164] Step 4f: Take 2.373 kg of the polymer obtained in Step 2f, 0.6 kg of short-cut glass fibers with thiol groups on the surface obtained in Step 3f, 12 g of silicone, 9 g of the first antioxidant 1076, and 6 g of the second antioxidant JYANO-168. Mix them evenly in a medium-speed mixer, and then melt-extrude and granulate them using a twin-screw extruder. The temperature zones of the extruder are set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃. The screw speed is 300 r / min, and the length-to-diameter ratio is 48:1. The composite material is obtained. Comparative Example 1

[0165] This comparative example provides a composite material, the preparation method of which is as follows:

[0166] Take 1.773 kg of commercially available general-purpose polycarbonate (PC-110, purchased from Chi Mei Industrial Co., Ltd.), 0.6 kg of chopped glass fiber (4.5 mm, purchased from Shandong Taicheng Fiber Co., Ltd.), 0.15 kg of bisphenol A-bis(diphenyl phosphate) (flame retardant BDP), 0.6 kg of PC commonly used MBS-type low-temperature toughening agent (M-722), 12 g of silicone, 9 g of primary antioxidant 1076, and 6 g of secondary antioxidant JYANO. -168, after being uniformly mixed in a medium-speed mixer, was melt-extruded and granulated using a twin-screw extruder. The temperature zones of the extruder were set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃. The screw speed was 300 r / min, and the length-to-diameter ratio was 48:1, resulting in the composite material. Comparative Example 2

[0167] This comparative example provides a composite material, the preparation method of which is as follows:

[0168] Take 2.373 kg of the polymer obtained in step 2c of Example 3, 0.6 kg of chopped glass fiber (4.5 mm, purchased from Shandong Taicheng Fiber Co., Ltd.), 12 g of silicone, 9 g of first antioxidant 1076, and 6 g of second antioxidant JYANO-168. Mix them evenly in a medium-speed mixer, and then melt-extrude and granulate them through a twin-screw extruder. The temperature zones of the extruder are set as follows: Zone 1: 150℃, Zone 2: 250℃, Zone 3: 250℃, Zone 4: 260℃, Zone 5: 260℃, Zone 6: 250℃, Zone 7: 240℃, Zone 8: 240℃, Zone 9: 240℃, Zone 10: 290℃, the screw speed is 300 r / min, and the length-to-diameter ratio is 48:1 to obtain the composite material.

[0169] The polymer obtained in step 2c of Example 3 was subjected to infrared spectroscopy testing, and the results are shown in Figure 2.

[0170] As shown in Figure 2, it is located at 1773 cm. -1 The absorption peak at 1508 cm⁻¹ corresponds to the stretching vibration of the carbonyl group in the carbonate group; -1 The absorption peak at 1223 cm⁻¹ corresponds to the skeletal vibration of the benzene ring; -1 and 1191 cm -1 The absorption peak at 2923 cm⁻¹ corresponds to the asymmetric stretching vibration of COC; -1 The absorption peak at 1299 cm⁻¹ is a characteristic peak of -CH₃ in the bisphenol A unit and PDMS unit. -1The absorption peak at 840 cm⁻¹ originates from the P=O stretching vibration in the phosphenanthrene group; -1 The absorption peak at 1600 cm⁻¹ is a characteristic peak of PO; -1 and 1500 cm -1 The nearby absorption peak is the stretching vibration peak of C=C in the benzene ring; it is located at 1091 cm⁻¹. -1 The absorption peak at 1261 cm⁻¹ is a characteristic peak of Si-O; -1 The absorption peak at 3066 cm⁻¹ corresponds to the deformation vibration of the methyl group in Si-CH₃; -1 The absorption peak at 966 cm⁻¹ is a characteristic peak of the unsaturated CH stretching vibration; -1 The absorption peak at 912 cm⁻¹ corresponds to the bending vibration of the trans CH group; -1 The absorption peak corresponds to the CH deformation vibration of the 1,2 addition product; it is located at 728 cm⁻¹. -1 The absorption peaks correspond to the cis-CH deformation vibrations; the appearance of the above characteristic bands indicates the successful synthesis of the copolymer PC (polymer) containing flame retardant ODOPB, PDMS and HTPB units.

[0171] The composite materials of Examples 1-6 and Comparative Examples 1-2 were injection molded to obtain mechanical property test strips and color plates for subsequent performance testing.

[0172] The composite materials of Examples 1-6 and the composite materials of Comparative Examples 1-2 were tested for density, heat distortion temperature, tensile strength, flexural modulus, room temperature notched impact strength, and flame retardancy rating. The test results are shown in Table 1.

[0173] The density test was performed according to ISO 1183; the heat distortion temperature of 1.8 MPa was performed according to ISO 75; the tensile strength test was performed according to ISO 527; the flexural modulus test was performed according to ISO 178; the cantilever beam notched impact strength test was performed according to GB / T 1843-2008; and the flame retardant performance test was performed according to UL94, with a sample thickness of 1.6 mm.

[0174] Table 1

[0175] Density (g / cm³) 3 Heat distortion temperature (°C), tensile strength (MPa), flexural modulus (GPa), room temperature notched impact strength (KJ / m) 2 -30℃ Notched impact strength (KJ / m) 2Flame retardant rating (UL94) Example 1 1.267 104 118 4.83 32.38 22.49 V1 Example 2 1.274 105 120 4.95 31.24 20.11 V0 Example 3 1.2459 7106 4.34 33.85 24.46 V0 Example 4 1.2539 811 34.69 45.69 28.25 V0 Example 5 1.2249 3101 4.48 50.25 31.39 V0 Example 6 1.1939 09 44.11 55.63 37.74 V0 Comparative Example 1 1.312 909 34.37 24.59 8.38 V1 Comparative Example 2 1.246 929 74.35 27.13 18.37 V0 surface

[0176] As shown in Table 1, the polymer in the composite material provided in this application has a lower density due to the introduction of highly flexible polydimethylsiloxane (PDMS) and polybutadiene molecular chains (HTPB), which is beneficial to the material's lightweighting. At the same time, as the content of PDMS and HTPB increases, the heat distortion temperature, mechanical strength and flexural strength of the material decrease, but are still better than those of Comparative Example 1.

[0177] By introducing PDMS and HTPB molecular chains with excellent low-temperature flexibility through chemical copolymerization, the impact toughness of PC was significantly improved; its impact resistance at low temperatures was also excellent; compared with the composite material reported in Comparative Example 1, the toughening effect of chemical copolymer flexible segments was better than that of composite addition of elastomer toughening agent. This is because the flexible components introduced by chemical copolymerization are more uniformly dispersed in PC material, and can more effectively absorb energy and avoid stress concentration when encountering impact.

[0178] Meanwhile, the composite material in Example 3 exhibits superior mechanical properties compared to the composite material in Comparative Example 2. This is because the glass fiber surface has thiol groups, which undergo an addition reaction with the side chain double bonds in the HTPB unit during melt blending with the polymer, resulting in a strong chemical bond between the glass fiber and the matrix, enhancing the interfacial bonding between the two and improving its mechanical properties.

[0179] Furthermore, the introduction of reactive flame retardant ODOPB and high-silicon PDMS into the PC molecular chain can endow PC with excellent intrinsic flame retardant properties due to the excellent synergistic flame retardant effect between the two. Example 1 contains only 3 mol% ODOPB and the flame retardant rating of the material is V1; Example 2 contains only 5 mol% ODOPB and the flame retardant rating of the material is V0.

[0180] In addition, a surface electroplating experiment was conducted on the injection molded part of the composite material provided in Example 3 of this application. The results are shown in Figure 3. After electroplating, the coating on the surface of the part is uniform in color, bright as a mirror, without any visible defects, and the surface is smooth and dense.

[0181] In summary, the composite material provided in this application has excellent mechanical properties, flame retardant properties, and the ability to be electroplated, and has broad application prospects in new energy vehicles, electronics, construction, military industry, and extreme environments such as wide temperature ranges.

[0182] The technical solutions provided by the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A composite material, characterized in that, The composite material comprises a polymer, glass fiber, silicone, and an antioxidant, and the polymer has the following structural formula: Where m represents the degree of aggregation, selected from any integer between 20 and 100; n represents the degree of aggregation, selected from any integer between 150 and 200; R is... , where a represents the molar content, which is 55%~65%, b represents the molar content, which is 20%~25%, c represents the molar content, which is 15%~20%; p represents the degree of polymerization, which is any integer selected from 50 to 100; w represents the molar content, which is 77%~90%; x represents the molar content, which is 2%~5%; y represents the molar content, which is 1%~2%; z represents the molar content, which is 1%~2%; where w+x+y+z=100%.

2. The composite material according to claim 1, characterized in that, By weight, the composite material contains 73.9 to 84.4 parts of polymer, 15 to 25 parts of glass fiber, 0.3 to 0.5 parts of silicone, and 0.3 to 0.6 parts of antioxidant.

3. The composite material according to claim 1, characterized in that, The glass fiber is a 3-mercaptopropyltrimethoxysilane modified glass fiber; the glass fiber is a chopped glass fiber.

4. The composite material according to claim 1 or 2, characterized in that, The antioxidant includes a first antioxidant and a second antioxidant; wherein the first antioxidant is selected from one or more of antioxidant 1076, antioxidant 1010, antioxidant 1098, and antioxidant 1024; the second antioxidant is selected from one or more of JYANO-168, antioxidant 923, antioxidant 2013, and antioxidant 1001; by weight, the first antioxidant accounts for 0.2 to 0.4 parts of the composite material; and the second antioxidant accounts for 0.1 to 0.2 parts of the composite material.

5. A method for preparing a composite material, characterized in that, The process includes the following steps: providing a polymer, glass fiber, silicone, and an antioxidant; mixing the polymer, glass fiber, silicone, and antioxidant, and reacting them to obtain a composite material; wherein the polymer has the following structural formula: Where m represents the degree of aggregation, selected from any integer between 20 and 100; n represents the degree of aggregation, selected from any integer between 150 and 200; R is... , where a represents the molar content, which is 55%~65%, b represents the molar content, which is 20%~25%, c represents the molar content, which is 15%~20%; p represents the degree of polymerization, which is any integer selected from 50 to 100; w represents the molar content, which is 77%~90%; x represents the molar content, which is 2%~5%; y represents the molar content, which is 1%~2%; z represents the molar content, which is 1%~2%; where w+x+y+z=100%.

6. The preparation method according to claim 5, characterized in that, The method for preparing the polymer includes: providing a first mixture and a second mixture, wherein the first mixture includes bisphenol A, flame retardant ODOPB, alkalinity regulator and a first solvent, and the second mixture includes triphosgene and a second solvent; mixing the first mixture and the second mixture to perform a first reaction to obtain a prepolymer mixture, wherein the prepolymer mixture includes a prepolymer; providing a third mixture, wherein the third mixture includes dihydroxyl-terminated polydimethylsiloxane, dihydroxyl-terminated polybutadiene and a third solvent; mixing the third mixture and the prepolymer mixture to perform a second reaction to obtain the polymer.

7. The preparation method according to claim 6, characterized in that, The first solvent, the second solvent, and the third solvent are each independently selected from one or more of deionized water, dichloromethane, chloroform, 1,2-dichloroethane, and tetrachloroethylene; the alkalinity regulator is selected from one or more of sodium hydroxide, potassium hydroxide, and lithium hydroxide; in the first mixture, the molar concentration of bisphenol A is 1 mol / L to 3 mol / L; in the first mixture, the molar concentration of the flame retardant ODOPB is 0.01 mol / L to 0.1 mol / L; in the first mixture, the molar concentration of the alkalinity regulator is 1 mol / L to 5 mol / L; in the second mixture, the molar concentration of triphosgene is 1 mol / L to 2 mol / L; in the third mixture, the dihydroxylated polydimethylformate... The molar concentration of the siloxane is 0.01 mol / L to 0.1 mol / L; in the third mixture, the molar concentration of the hydroxyl-terminated polybutadiene is 0.01 mol / L to 0.1 mol / L; the molar ratio of bisphenol A, the flame retardant ODOPB, the triphosgene, the hydroxyl-terminated polydimethylsiloxane, and the hydroxyl-terminated polybutadiene is (1~3):(0.01~0.15):(0.36~1.15):(0.01~0.06):(0.01~0.06); the reaction temperature of the first reaction is 20℃~30℃, and the reaction time of the first reaction is 0.5h~3h; the reaction temperature of the second reaction is 20℃~30℃, and the reaction time of the second reaction is 0.5h~3h.

8. The preparation method according to claim 5, characterized in that, The glass fiber is a 3-mercaptopropyltrimethoxysilane-modified glass fiber. The preparation method of the 3-mercaptopropyltrimethoxysilane-modified glass fiber includes: providing a fourth mixture comprising unmodified glass fiber and a fourth solvent; providing 3-mercaptopropyltrimethoxysilane; mixing the 3-mercaptopropyltrimethoxysilane and the fourth mixture to perform a third reaction to obtain the 3-mercaptopropyltrimethoxysilane-modified glass fiber; wherein the unmodified glass fiber is chopped glass fiber; the fourth solvent is selected from one or more of ethyl acetate, methyl acetate, butyl acetate, and isopropyl acetate; the mass concentration of the unmodified glass fiber in the fourth mixture is 300 g / L to 400 g / L; the mass ratio of the unmodified glass fiber to the 3-mercaptopropyltrimethoxysilane is (300~400):(6~7); the reaction temperature of the third reaction is 20℃~30℃, and the reaction time of the third reaction is 0.5 h~3 h.

9. The preparation method according to claim 5, characterized in that, The antioxidant includes a first antioxidant and a second antioxidant; the first antioxidant is selected from one or more of antioxidant 1076, antioxidant 1010, antioxidant 1098, and antioxidant 1024; the second antioxidant is selected from one or more of JYANO-168, antioxidant 923, antioxidant 2013, and antioxidant 1001. The polymer comprises 73.9 to 84.4 parts by weight, and the glass fiber comprises 15 to 25 parts by weight. The amount of silicone is 0.3 to 0.5 parts, the amount of the first antioxidant is 0.2 to 0.4 parts, and the amount of the second antioxidant is 0.1 to 0.2 parts; the reaction of the polymer, the glass fiber, the silicone, and the antioxidant includes: melt extrusion granulation; the conditions for melt extrusion granulation are: temperature of 150℃ to 300℃, screw speed of 200 r / min to 500 r / min, and length-to-diameter ratio of (40 to 50):

1.

10. The application of the composite material as described in any one of claims 1 to 4, or the composite material prepared by the preparation method as described in any one of claims 5 to 9, in the fields of new energy vehicles, electronics, construction, and military industry.

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