Bismaleimide blended resin and synthesis method and application thereof

Abstract

The invention discloses bismaleimide blended resin as well as a synthesis method and application thereof. And the blended resin is a blended resin of diallyl bisphenol A (DABPA) and bismaleimide. The invention further discloses a preparation method of the resin. The cured resin of the blended resin has the characteristic of high elastic modulus, is suitable for being used as a high-performance composite material resin matrix, and has certain application value in the fields of military industry, aerospace, electronics and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of synthesis and application of bismaleimide blended resins, and particularly relates to a bismaleimide blended resin with a high elastic modulus, a preparation method thereof and an application thereof. Background Art

[0002] Bismaleimide (BMI) is a type of bifunctional compound with maleimide as the active end group, which can be copolymerized with a variety of compounds to form tough heat-resistant resins. As a matrix resin for composite materials, BMI has excellent moisture and heat resistance, good mechanical properties, chemical resistance, environmental corrosion resistance, and radiation resistance, and is widely used in military, aerospace, and electronics fields.

[0003] At present, there are roughly three methods for synthesizing BMI at home and abroad: (1) Using strong polar solvents N,N-dimethylformamide (DMF), dimethylacetamide (DMAc) or N-methylpyrrolidone (NMP) as the reaction medium, sodium acetate as the catalyst, acetic anhydride as the water absorbent, and dehydration reaction at a certain temperature. The solvent toxicity of this method is high, the price is high, and the product quality is poor. If it is used as an advanced composite resin matrix, it must be purified. (2) Using acetone as the solvent, nickel acetate as the catalyst, and acetic anhydride as the dehydrating agent, the reaction is carried out under reflux conditions. The characteristics of this method are: BMI precipitates from the solvent as a solid, the reaction is not easy to be uniform, the solvent is not easy to recover, and the industrial production is seriously polluted. (3) Using DMF or DMAc, NMP as the main solvent, the azeotropic distillation dehydration method is adopted. A solvent that can form an azeotrope with water, such as toluene, is added during the reaction process. While the azeotrope of water and the solvent is evaporated in the presence of an acidic catalyst, the thermal ring is closed. The entire synthesis reaction process is homogeneous, and the product yield is high and the product quality is stable.

[0004] At present, the commercialized BMI in China has a single structure and few categories, and most new BMI monomers are still in the research and development stage. With the continuous development of science and technology, it is urgent to develop new BMI monomers with functional characteristics. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a synthesis and application of a bismaleimide blended resin. The bismaleimide active end group used in the blended resin is a meta structure, and the cured product thereof has a high elastic modulus characteristic.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A blended resin, which is a blended resin of diallyl bisphenol A (DABPA) and bismaleimide, wherein the bismaleimide is selected from the bismaleimide represented by formula (3) or formula (4):

[0008]

[0009] In formula (3), R 4 , R 5 , R 6 The same or different, each independently selected from H, C 1-12 Alkyl, C 1-12 Alkoxy, C 1-12 Alkyl-OC 1-12 Alkyl, C 2-12 Alkenyl-C 1-12 alkyl;

[0010] In formula (4), Ar is selected from -S(O) 2 -, -O-, -S-, unsubstituted, or optionally substituted by one, two or more Rs: -C 1-12 Alkyl-, -C 1-12 Alkyl-OC 1-12 Alkyl-, -C 1-12 Alkyl-SC 1-12 Alkyl-, -C 6-20 Aryl-, -C 6-20 Aryl-C 1-12 Alkyl-C 6-20 Aryl-, -C 6-20 Aryl-OC 6-20 Aryl-, -C 6-20 Aryl-SC 6-20 Aryl-; Rs is selected from C 1-12 alkyl;

[0011] R 1 and R 2 The same or different, each independently selected from H, C 1-12 Alkyl or C 1-12 Alkoxy;

[0012] m and n are the same or different and are each independently selected from 1, 2, 3 or 4.

[0013] According to an embodiment of the present invention, in formula (3), R 4 , R 5 , R 6 The same or different, each independently selected from H, C 1-6 Alkyl or C 1-6 Alkoxy;

[0014] In formula (4), Ar is selected from -S(O) 2 -, -O-, -S-, -C 1-6 Alkyl-, -C 1-6 Alkyl-OC 1-6 Alkyl- or -C 1-6Alkyl-SC 1-6 alkyl-;

[0015] R 1 , R 2 The same or different, each independently selected from H, C 1-6 Alkyl or C 1-6 Alkoxy.

[0016] According to an embodiment of the present invention, in formula (3), R 4 , R 5 , R 6 The same or different, each independently selected from H, methyl or ethyl; for example, formula (3) is selected from the following structures:

[0017]

[0018] According to an embodiment of the present invention, in formula (4), Ar is selected from -S(O) 2 -, -O-, -S-, -C 1-3 Alkyl-, -C 1-3 Alkyl-OC 1-3 Alkyl- or -C 1-3 Alkyl-SC 1-3 Alkyl-; for example, formula (4) is selected from the following structures:

[0019]

[0020] According to an embodiment of the present invention, the reaction temperature is 60-150°C, such as 100-145°C.

[0021] According to an embodiment of the present invention, the bismaleimide represented by formula (3) or formula (4) of the present invention is prepared according to a method comprising the following steps:

[0022] (1) adding maleic anhydride to a solvent, preparing a solution of a diamine represented by formula (1) or formula (2), and adding the solution dropwise to the maleic anhydride solution, controlling the dropping speed so that the solution temperature does not exceed 30° C.;

[0023] (2) After the addition is complete, the reaction solution is stirred at 0-30°C for 1-12 hours;

[0024] (3) adding a dehydrating agent to perform azeotropic distillation until no more water is distilled out and cooling to room temperature;

[0025] (4) the reaction solution is precipitated into a solvent to obtain a crude bismaleimide product, and the crude product is washed with water and dried to obtain a bismaleimide represented by formula (3) or formula (4);

[0026]

[0027]

[0028] Among them, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , Ar, m and n have the same meanings as above.

[0029] According to an embodiment of the present invention, the dehydrating agent is selected from one or both of benzenesulfonic acid and p-toluenesulfonic acid.

[0030] According to an embodiment of the present invention, the reaction solvent is selected from a mixed solvent consisting of one of toluene and xylene, and one of N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMAc).

[0031] According to an embodiment of the present invention, the solvent used for precipitation of the reaction solution is selected from one of ethyl acetate, methanol, ethanol and deionized water.

[0032] According to an embodiment of the present invention, the molar ratio of the diamine to maleic anhydride is 1:1.5-4.0.

[0033] According to an embodiment of the present invention, the molar ratio of the diamine to the dehydrating agent is 1:0.2-1.0.

[0034] According to an embodiment of the present invention, the concentration of the diamine solution is a mass percentage selected from 12-35%.

[0035] According to an embodiment of the present invention, the solid content of the reaction solution is a mass percentage selected from 5-20%.

[0036] According to an embodiment of the present invention, the dropping speed of the diamine solution is 3-15 ml / min.

[0037] According to an embodiment of the present invention, the azeotropic distillation temperature is 90-130°C.

[0038] According to an embodiment of the present invention, the water separation time is 3.5-8h.

[0039] The present invention also provides a method for preparing the blended resin of DABPA and bismaleimide as described above, comprising the following steps: reacting DABPA with the bismaleimide represented by formula (3) or formula (4),

[0040]

[0041]

[0042] Among them, R 1, R 2 , R 3 , R 4 , R 5 , R 6 , Ar, m and n have the same meanings as above.

[0043] According to an embodiment of the present invention, the reaction temperature is 60-150°C, such as 100-145°C.

[0044] According to an embodiment of the present invention, the molar ratio of DABPA to the bismaleimide represented by formula (3) or formula (4) is 1:(0.5-1.5).

[0045] In one embodiment of the present invention, the blended resin is prepared by the following method: DABPA is stirred at 100-145° C., bismaleimide represented by formula (3) or formula (4) is added, the system is stirred until the system is homogeneous and transparent, and the temperature is reduced and the material is discharged to obtain the blended resin.

[0046] The present invention also provides a cured resin, which is a cured product of the blended resin as described above.

[0047] According to an embodiment of the present invention, the curing resin is prepared by a method comprising: degassing the blended resin under high temperature vacuum, and curing it in a programmed temperature oven.

[0048] According to an embodiment of the present invention, the degassing temperature is between 120-150°C.

[0049] According to an embodiment of the present invention, the resin curing temperature rising process is: 180°C / 2h, 200°C / 2h, 220°C / 2h, 250°C / 5h.

[0050] The present invention also provides the use of the above-mentioned cured resin as a composite material resin matrix in the fields of military industry, aerospace, electronics, etc., such as cable covers, wings and PCB substrates.

[0051] The beneficial effects of the present invention are:

[0052] The present invention discloses a curing resin of a bismaleimide resin obtained by blending and copolymerizing bismaleimide and DABPA. The obtained curing resin has a high elastic modulus characteristic and is suitable as a high-performance composite material resin matrix. Specifically, the inventors found that the active end group of the bismaleimide used in the present application is meta-position, and the elastic modulus of the curing resin obtained by blending and copolymerizing the bismaleimide with DABPA is significantly better than that of the raw material with the active end group in the para position. In addition, the resin prepared by the meta-position raw material also has excellent heat resistance, impact resistance and bending performance.

[0053] Definition and explanation of terms

[0054] Unless otherwise defined, all technical and scientific terms herein have the same meaning as commonly understood by one of ordinary skill in the art to which the claimed subject matter belongs.

[0055] "More" means three or more.

[0056] The term "C 1-12 "Alkyl" is understood to mean a straight-chain or branched saturated monovalent hydrocarbon radical having 1 to 12 carbon atoms. For example, "C 1-6 The term "alkyl" refers to straight-chain and branched alkyl groups having 1, 2, 3, 4, 5, or 6 carbon atoms. The alkyl group is, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl, 2-methylbutyl, 1-methylbutyl, 1-ethylpropyl, 1,2-dimethylpropyl, neopentyl, 1,1-dimethylpropyl, 4-methylpentyl, 3-methylpentyl, 2-methylpentyl, 1-methylpentyl, 2-ethylbutyl, 1-ethylbutyl, 3,3-dimethylbutyl, 2,2-dimethylbutyl, 1,1-dimethylbutyl, 2,3-dimethylbutyl, 1,3-dimethylbutyl, 1,2-dimethylbutyl, or the like or isomers thereof.

[0057] The term "C 1-12 "Alkoxy" is understood to mean -OC 1-12 Alkyl, where C 1-12 Alkyl has the above definition.

[0058] The term "C 2-12 "Alkenyl" is understood to mean a linear or branched monovalent hydrocarbon radical containing one or more double bonds and having 2 to 12 carbon atoms, optionally 2-6 "C 2-6 "Alkenyl" is understood to mean optionally a linear or branched monovalent hydrocarbon radical containing one or more double bonds and having 2, 3, 4, 5, 6 carbon atoms, in particular 2 or 3 carbon atoms ("C 2-3"alkenyl"), it being understood that, in the case where the alkenyl contains more than one double bond, the double bonds may be separated from one another or conjugated. The alkenyl is, for example, vinyl, allyl, (E)-2-methylvinyl, (Z)-2-methylvinyl, (E)-but-2-enyl, (Z)-but-2-enyl, (E)-but-1-enyl, (Z)-but-1-enyl, pent-4-enyl, (E)-pent-3-enyl, (Z)-pent-3-enyl, -enyl, (E)-pent-2-enyl, (Z)-pent-2-enyl, (E)-pent-1-enyl, (Z)-pent-1-enyl, hex-5-enyl, (E)-hex-4-enyl, (Z)-hex-4-enyl, (E)-hex-3-enyl, (Z)-hex-3-enyl, (E)-hex-2-enyl, (Z)-hex-2-enyl, (E)-hex-1-enyl, (Z)-hex-1-enyl, isopropenyl, 2-hexenyl, (E)-pent-2-enyl, (Z)-pent-2-enyl, (E)-pent-1-enyl, (Z)-pent ...1-enyl, (Z)-pent-1-enyl, isopropenyl, 2-hexenyl, (E)-pent-2- -methylprop-2-enyl, 1-methylprop-2-enyl, 2-methylprop-1-enyl, (E)-1-methylprop-1-enyl, (Z)-1-methylprop-1-enyl, 3-methylbut-3-enyl, 2-methylbut-3-enyl, 1-methylbut-3-enyl, 3-methylbut-2-enyl, (E)-2-methylbut-2-enyl, (Z)-2-methylbut-2-enyl, (E)-1-methylbut-2-enyl The invention can be substituted with vinyl or 1-isopropylvinyl, or a mixture of vinyl and 1-isopropylvinyl. The invention can be substituted with vinyl or 1-isopropylvinyl, or a mixture of vinyl and 1-isopropylvinyl.

[0059] The term "C 6-20 "Aryl" is understood to mean a monovalent aromatic or partially aromatic monocyclic, bicyclic or tricyclic hydrocarbon ring having 6 to 20 carbon atoms, preferably "C 6-14 The term "C 6-14 The term "aryl" is understood to mean preferably a monovalent aromatic or partially aromatic monocyclic, bicyclic or tricyclic hydrocarbon ring ("C 6-14 Aryl), especially a ring having 6 carbon atoms ("C 6 aryl), such as phenyl; or biphenyl, or a ring having 9 carbon atoms ("C 9 aryl), such as indanyl or indenyl, or a ring having 10 carbon atoms ("C 10 aryl), such as tetrahydronaphthyl, dihydronaphthyl or naphthyl, or a ring having 13 carbon atoms ("C 13 aryl), such as fluorenyl, or a ring having 14 carbon atoms ("C14 aryl”), such as anthracenyl. When the C 6-20 When the aryl group is substituted, it may be monosubstituted or polysubstituted. Also, there is no limitation on the substitution position, for example, it may be substituted at the ortho position, para position or meta position. DETAILED DESCRIPTION

[0060] The technical scheme of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0061] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0062] Example 1

[0063] Add 17.33g maleic anhydride, 460mL DMAc and 60mL toluene to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stir evenly. Take 17.37g 3,3'-diaminodiphenyl sulfone, 40mL DMAc and 30mL toluene to make a solution, add it dropwise to the maleic anhydride solution, and control the drop rate to 5mL / min; after the dropwise addition is completed, react at 25℃ for 4h. Add 6.71g p-toluenesulfonic acid to the above system, heat to about 115℃, the solution becomes a light yellow transparent solution, continue to heat to boiling and separate water, observe the reflux and water separation conditions, no water is distilled after 6h of water separation reaction, and cool down. The reaction solution is precipitated into ethanol to obtain a crude bismaleimide, and the crude product is washed three times with water and dried to obtain a light yellow bismaleimide powder.

[0064] Example 2

[0065] Add 17.16g of maleic anhydride, 15mL of DMF and 215mL of toluene to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stir evenly. Take 7.53g of m-phenylenediamine, 35mL of DMAc and 35mL of toluene to make a solution, add it dropwise to the maleic anhydride solution, and control the drop rate to 5.2mL / min; after the dropwise addition is completed, react at 25°C for 3.5h. Add 5.22g of p-toluenesulfonic acid to the above system, heat to about 115°C, the solution becomes a light yellow transparent solution, continue to heat to boiling and separate water, observe the reflux and water separation conditions, no water is distilled after 6h of water separation reaction, and cool down. The reaction solution is precipitated in water to obtain a crude bismaleimide product, and the crude product is washed three times with water and dried to obtain a light yellow bismaleimide powder.

[0066] Example 3

[0067] Add 16.17g maleic anhydride, 30mL DMAc and 210mL xylene to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stir evenly. Take 7.32g 2,4'-diaminotoluene, 40mL DMF and 50mL toluene to make a solution, add it dropwise to the maleic anhydride solution, and control the drop rate to 4mL / min; after the dropwise addition is completed, react at 25°C for 6h. Add 7.25g p-toluenesulfonic acid to the above system, heat to about 118°C, the solution becomes a light yellow transparent solution, continue to heat to boiling and separate water, observe the reflux and water separation conditions, no water is distilled after 6.5h of water separation reaction, and cool down. The reaction solution is precipitated in water to obtain a crude bismaleimide product, and the crude product is washed three times with water and dried to obtain a light yellow bismaleimide powder.

[0068] Comparative Example 1

[0069] Add 17.33g maleic anhydride, 460mL DMAc and 60mL toluene to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stir evenly. Take 17.37g 4,4'-diaminodiphenyl sulfone, 40mL DMAc and 30mL toluene to make a solution, add it dropwise to the maleic anhydride solution, and control the drop rate to 5mL / min; after the dropwise addition is completed, react at 25℃ for 4h. Add 6.71g p-toluenesulfonic acid to the above system, heat to about 115℃, the solution becomes a light yellow transparent solution, continue to heat to boiling and separate water, observe the reflux and water separation conditions, no water is distilled after 6h of water separation reaction, and cool down. The reaction solution is precipitated into ethanol to obtain a crude bismaleimide product, and the crude product is washed three times with water and dried to obtain a light yellow bismaleimide powder.

[0070] Comparative Example 2

[0071] Add 17.16g maleic anhydride, 15mL DMAc and 215mL toluene to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stir evenly. Take 14.02g 4,4'-diaminodiphenyl ether, 35ml DMAc and 32mL toluene to make a solution, add it dropwise to the maleic anhydride solution, and control the drop rate to 5.3mL / min; after the dropwise addition is completed, react at 25°C for 4h. Add 5.33g p-toluenesulfonic acid to the above system, heat to about 113°C, the solution becomes a light yellow transparent solution, continue to heat to boiling and separate water, observe the reflux and water separation conditions, no water is distilled after 6h of water separation reaction, and cool down. The reaction solution is precipitated into ethanol to obtain a crude bismaleimide product, and the crude product is washed three times with water and dried to obtain a light yellow bismaleimide powder.

[0072] Comparative Example 3

[0073] Add 17.03g maleic anhydride, 25mL DMAc and 205mL toluene to a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and stir evenly. Take 15.13g 4,4'-diaminodiphenylmethane, 31mL DMAc and 38mL toluene to make a solution, add it dropwise to the maleic anhydride solution, and control the drop rate to 5.8mL / min; after the dropwise addition is completed, react at 25°C for 4h. Add 5.83g p-toluenesulfonic acid to the above system, heat to about 110°C, the solution becomes a light yellow transparent solution, continue to heat to boiling and separate water, observe the reflux and water separation conditions, no water is distilled after 5.5h of water separation reaction, and cool down. The reaction solution is precipitated in deionized water to obtain a crude bismaleimide, and the crude product is washed three times with water and dried to obtain a light yellow bismaleimide powder.

[0074] Example 4

[0075] 1 mol of DABPA was added to a three-necked flask equipped with a stirrer and a thermometer, and 1 mol of bismaleimide powder obtained in Examples 1-3 and Comparative Examples 1-3 was added when the temperature was heated to 120°C, and the melting temperature was not more than 150°C. The mixture was stirred until homogeneous and transparent, and the temperature was lowered to obtain the corresponding bismaleimide resins. The above six bismaleimide resins were placed in a vacuum drying oven, degassed at 120°C for 10 minutes, and then placed in a programmed temperature rising oven for curing to obtain the respective cured resins. The curing temperature rising process was specifically: 180°C / 2h, 200°C / 2h, 220°C / 2h, 250°C / 5h.

[0076] The above 6 kinds of curing resins were subjected to the following performance tests:

[0077] The bending modulus is tested by a universal tensile machine according to the test standard GB / T 2567-2008.

[0078] The impact strength is tested using a simply supported beam impact machine in accordance with the test standard GB / T 2567-2008.

[0079] The bending strength is tested by a universal tensile machine according to the test standard GB / T 2567-2008.

[0080] The glass transition temperature was tested by a dynamic mechanical thermal analyzer with a test frequency of 1 Hz and a heating rate of 5 °C / min.

[0081] The difference between Comparative Example 1-3 and Example 1-3 is that the active end groups of the bismaleimide obtained in Example 1-3 are at the 3,3 position, and the cured resin obtained by melting it with DABPA has a high elastic modulus property. However, the active end groups of the bismaleimide obtained in Comparative Example 1-3 are at the 4,4 position, and the cured resin obtained by melting it with DABPA has a significantly lower modulus. The specific data are listed in Table 1.

[0082] Table 1 Test results of bending modulus of cured resins of Examples 1-3 and Comparative Examples 1-3

[0083] Source of raw materials Flexural modulus(GPa) Example 1 4.5 Example 2 4.5 Example 3 4.5 Comparative Example 1 3.5 Comparative Example 2 3.6 Comparative Example 3 3.6

[0084] Table 2 Other performance test results of the cured resins of Examples 1-3 and Comparative Examples 1-3

[0085]

[0086] From the above test data, it can be seen that the bending modulus of the cured resin obtained by melting the bismaleimide prepared by the meta-diamine and DABPA in the present invention is significantly higher than the bending modulus of the cured resin obtained by melting the bismaleimide prepared by the para-diamine and DABPA. In addition, the resin prepared by the meta-position raw material also has excellent heat resistance, impact resistance and bending properties.

[0087] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blended resin, It is characterized in that It is a blended resin of diallyl bisphenol A (DABPA) and bismaleimide, wherein the bismaleimide is selected from the bismaleimide represented by formula (3) or formula (4): In formula (3), R 4 , R 5 , R 6 The same or different, each independently selected from H, C 1-12 Alkyl, C 1-12 Alkoxy, C 1-12 Alkyl-OC 1-12 Alkyl, C 2-12 Alkenyl-C 1-12 alkyl; In formula (4), Ar is selected from -S(O) 2 -, -O-, -S-, unsubstituted, or optionally substituted by one, two or more Rs: -C 1-12 Alkyl-, -C 1-12 Alkyl-OC 1-12 Alkyl-, -C 1-12 Alkyl-SC 1-12 Alkyl-, -C 6-20 Aryl-, -C 6-20 Aryl-C 1-12 Alkyl-C 6-20 Aryl-, -C 6-20 Aryl-OC 6-20 Aryl-, -C 6-20 Aryl-SC 6-20 Aryl-; Rs is selected from C 1-12 alkyl; R 1 and R 2 The same or different, each independently selected from H, C 1-12 Alkyl or C 1-12 Alkoxy; m and n are the same or different and are each independently selected from 1, 2, 3 or 4.

2. The blended resin according to claim 1, It is characterized in that In formula (3), R 4 , R 5 , R 6 The same or different, each independently selected from H, C 1-6 Alkyl or C 1-6 Alkoxy; In formula (4), Ar is selected from -S(O) 2 -, -O-, -S-, -C 1-6 Alkyl-, -C 1-6 Alkyl-OC 1-6 Alkyl- or -C 1-6 Alkyl-SC 1-6 alkyl-; R 1 , R 2 The same or different, each independently selected from H, C 1-6 Alkyl or C 1-6 Alkoxy.

3. The blended resin according to claim 1 or 2, It is characterized in that In formula (3), R 4 , R 5 , R 6 The same or different, each independently selected from H, methyl or ethyl; In formula (4), Ar is selected from -S(O) 2 , -O-, -S-, C 1-3 Alkyl, -C 1-3 Alkyl-OC 1-3 Alkyl- or -C 1-3 Alkyl-SC 1-3 alkyl-; Preferably, the molar ratio of DABPA to the bismaleimide represented by formula (3) or formula (4) is 1:(0.5-1.5).

4. A method for preparing the blended resin according to any one of claims 1 to 3, It is characterized in that The method comprises the following steps: reacting DABPA with bismaleimide represented by formula (3) or formula (4), Among them, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , Ar, m and n have the definitions as set forth in any one of claims 1-3.

5. The preparation method according to claim 4, It is characterized in that The reaction temperature is 60-150°C; Preferably, the molar ratio of DABPA to the bismaleimide represented by formula (3) or formula (4) is 1:(0.5-1.5).

6. The preparation method according to claim 4 or 5, It is characterized in that The blended resin is prepared by the following method: DABPA is stirred at 100-145° C., bismaleimide represented by formula (3) or formula (4) is added, the system is stirred until the phase is homogeneous and transparent, and the temperature is lowered and the material is discharged to obtain the blended resin.

7. A cured resin, which is a cured product of the blended resin according to any one of claims 1 to 3.

8. The curable resin according to claim 7, It is characterized in that The method comprises the following steps: degassing the blended resin according to claim 1 or 2 under high temperature vacuum, and curing in a programmed temperature oven; Preferably, the degassing temperature is between 120-150°C.

9. The curable resin according to claim 8, It is characterized in that The curing temperature rising process is: 180℃ / 2h, 200℃ / 2h, 220℃ / 2h, 250℃ / 5h.

10. Use of the cured resin according to any one of claims 7 to 9 as a composite resin matrix in the fields of military industry, aerospace, electronics, etc., such as cable covers, wings and PCB substrates.

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