Polypropylene acid imide foam material and preparation thereof
A technology of polyacrylimide and foam materials, which is applied in the field of polyacrylimide foam materials and its preparation, and can solve the problems of decreased foam performance stability, increased foam brittleness, and difficulty in the uniformity of free radical polymerization reaction systems, etc. problems, to achieve the effect of improving heat resistance, increasing strength and modulus
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[0034] The preparation method of maleimide refers to the literature (Zhu Yulong, etc., the synthesis of a new type of ether bond-containing bismaleimide, insulating material, No. 5, 2005): dissolve the aromatic diamine in an electric stirring After it is completely dissolved, add maleic anhydride and stir at room temperature for 4 to 5 hours to obtain the bismaleimide solution. In the above bismaleimide solution, add a certain amount of acetic anhydride and sodium acetate respectively, stir at room temperature for about 15 minutes, and then heat to 60 ~ 65 ℃, continue to react for about 3 hours, after cooling, pour into water , A large amount of yellow precipitate is produced, filtered, soaked in acetone, rinsed several times, and dried to obtain maleimide resin powder. The reaction formula is as follows:
[0035]
[0036] Among them, some fluorine-containing diamines can be synthesized according to the methods disclosed in the literature (Xie K, et al. J. Polym Sci., Part A: Po...
Example Embodiment
[0039] Example 1,
[0040]Mix 50 parts of methacrylic acid, 50 parts of methacrylonitrile, 25 parts of methacrylamide, 25 parts of bismaleimide resin with C structure -R- group, 10 parts of allyl methacrylate, 10 parts Formamide, 5 parts of dibenzoyl peroxide and 5 parts of tert-butyl peroxypivalate, 15 parts of isopropanol, 5 parts of INT-PS125, and 3 parts of benzoquinone were added to a 3000mL three-necked glass flask in sequence, under nitrogen protection After stirring at room temperature for 2 hours, a homogeneous solution was formed.
[0041] Transfer the above homogeneous solution to a closed system formed by two glass plates and a sealing frame, and polymerize under the following conditions: 50℃ / 24h, 60℃~90℃ / 58h, 100℃ / 1h, to obtain the foam precursor Copolymer resin sheet.
[0042] The foam precursor copolymer resin sheet obtained above is foamed at 185°C / 1h to obtain a polymethacrylimide foam sheet blank.
[0043] The polymethacrylimide foam board blank obtained above is...
Example Embodiment
[0044] Example 2,
[0045] Combine 55 parts of methacrylic acid, 45 parts of methacrylonitrile, 5 parts of bismaleimide resin whose -R- group is C structure, 1.5 parts of formamide, 3 parts of tert-butyl peroxide pivalate, 2 parts Tert-butyl peroxy benzoate, 1 part of tert-butyl peroxy 2-ethylhexanoate, 5 parts of isopropanol, 3 parts of INT-PS125, and 0.3 part of benzoquinone were added to a 3000mL three-necked glass flask in sequence. Under the protection of nitrogen, stir at room temperature for 2 hours to form a homogeneous solution.
[0046] Transfer the above homogeneous solution to a closed system formed by two glass plates and a sealing frame, and polymerize it under the following conditions: 50℃ / 24h, 60℃~90℃ / 96h, 100℃~120℃ / 3h, obtain Foam precursor copolymer resin sheet.
[0047] The foam precursor copolymer resin sheet obtained above is foamed at 190°C / 1h to obtain a polymethacrylimide foam sheet blank.
[0048] The polymethacrylimide foam board blank obtained above is s...
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