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Low-density high-toughness bismaleimide foam material and preparation method thereof
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A technology of bismaleimide and foam material is applied in the field of bismaleimide foam material to achieve the effect of realizing foaming ability and avoiding high density
Pending Publication Date: 2021-11-26
常州福隆科技新材料有限公司
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Problems solved by technology
However, the research on bismaleimide foam is still in its infancy, and there is no commercial BMI foam on the market.
Method used
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preparation example Construction
[0093] The present invention also provides a kind of preparation method of bismaleimide foam material, comprises the following steps:
[0095] (2) After mixing the prepolymer obtained in the above steps, physical foaming material, chemical foaming agent, thermoplastictoughening agent, thixotropic agent, surfactant and inorganic filler, after carrying out foaming and curing in the mould, then After post-curing, a bismaleimide foam material is obtained.
[0096] In the invention, firstly, the prepolymer is obtained by reacting the bismaleimide and the allyl compound.
[0097] In the present invention, the reaction temperature is preferably 130-150°C, more preferably 134-146°C, more preferably 138-142°C.
[0098] In the present invention, the reaction time is preferably 1-3 hours, more preferably 1.4-2.6 hours, more preferably 1.8-2.2 hours.
[0099] The present invention then mi...
Embodiment 1
[0122] According to N, N'-(4,4-methylene diphenyl) bismaleimide resin 40%, allyl bisphenol A 24%, react at 140°C for 2 hours, add to the prepolymer F230D 10%, azodicarbonamide 1%, polyetherimide 10%, fumed silica 2%, AK-8890 3%, expandable graphite 10%, stir evenly, and place in an aluminum mold. Heating at 150°C for 2 hours, foaming and curing during this process, continue to heat to 180°C for 2 hours, then heat to 200°C for 2 hours, and finally heat to 250°C for 2 hours. After taking it out, it was cooled to room temperature to obtain a bismaleimide foam.
Embodiment 2
[0124] According to 50% bis(3-ethyl-5-methyl-4-maleimidophenyl) methane resin, 30% diallylamine, react at 130°C for 2 hours, add to the prepolymer 920DU40 8%, N,N-dinitrosopentamethylenetetramine 1%, polyaryletherketone 10%, fumed silica 2%, B-8002 3%, expandable graphite 10%, stir evenly, set in an aluminum mold. Heating at 140°C for 2 hours, foaming and curing during this process, continue to heat to 160°C for 2 hours, then heat to 180°C for 2 hours, and finally heat to 230°C for 2 hours. After taking it out, it was cooled to room temperature to obtain a bismaleimide foam.
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Abstract
The invention provides a bismaleimide foam material. The density of the bismaleimide foam material is 70 to 300 kg / m<3>; and the pore diameter of the bismaleimide foam material is 0.2 to 1 mm. By controlling the selection of a physical foaming agent and a chemical foaming agent, the synergistic effect of foaming reaction of bismaleimide resin and resin curing molding is realized, and further by controlling the formula proportion of the physical foaming agent and the chemical foaming agent, the foaming capacity is maximized; the phenomena of high density of a physical foaming agent, core burning, implosion and the like of a chemical foaming agent are avoided, and the high-toughness bismaleimide resin foam with relatively low density can be obtained after a thermoplastictoughening agent is added. The bismaleimide foam provided by the invention has the characteristics of high heat resistance, mechanical property, low density and high toughness, and the preparation process is simple, easy to control and beneficial to industrial continuous production.
Description
technical field [0001] The invention belongs to the technical field of bismaleimide foam materials, and relates to a bismaleimide foam material and a preparation method thereof, in particular to a low-density high-toughness bismaleimide foam material and a preparation method thereof . Background technique [0002] With the rapid development of special fields such as aerospace and aviation, the performance requirements of foamed plastics are continuously improved. Traditional foamed plastics cannot meet the requirements of these fields for material strength, stiffness, heat resistance, and corrosion resistance. Therefore, high performance has become a new vane of foam research. Foreign countries have used high-performance foam as a structural core material in aviation, aerospace, transportation and other fields, such as the skeleton of satellite solar cells, rocket front fairings, unmanned aircraft tail fins, missiletail fins, large radomes, etc. [0003] Bismaleimide (BMI...
Claims
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Application Information
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