Poly (p-phenylene benzobisoxazole) fiber paper-based material for high-temperature-resistant honeycomb core material and preparation method of poly (p-phenylene benzobisoxazole) fiber paper-based material
A technology of benzobisoxazole and honeycomb core material, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, special paper, etc., and can solve the problems of low bonding strength and poor performance stability of composite materials , to achieve the effect of improving mechanical properties, good mechanical properties and high temperature resistance, and improving high temperature resistance
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[0024] A method for preparing a poly-p-phenylenebenzobisoxazole fiber paper-based material for a high-temperature-resistant honeycomb core material, comprising the following steps:
[0025] Step 1, immersing the absolute dry PBO chopped fibers with a length of 3-8mm in a sodium hydroxide solution with a mass fraction of 1%-5% for pretreatment, and then washing the pretreated PBO fibers with deionized water to neutrality, drying spare;
[0026] Step 2, take the absolute dry meta-aramid chopped fiber and the PBO chopped fiber treated in step 1 and put them into the deflagging machine together, add a dispersant according to a certain proportion and then perform the first deflagging and dispersing, the dispersing agent is poly One of acrylamide, polymethacrylic acid, polyvinyl alcohol, polyethylene oxide, and polyvinylpyrrolidone; the amount of dispersant added is 0.3% of the absolute dry mass sum of PBO chopped fibers and meta-aramid chopped fibers- 1.0%; then add meta-aramid fi...
Embodiment 1
[0032] Absolutely dry PBO chopped fibers with a length of 3mm were immersed in a 1% NaOH solution for pretreatment, and then the pretreated PBO fibers were washed to neutral with deionized water, and dried for later use. Put the pretreated PBO chopped fiber and meta-aramid chopped fiber into the deflagging machine at the same time according to the ratio of 3:1 in mass ratio to decompose and disperse for 10000r, add polyethylene oxide as a dispersant during decomposing, and the addition amount is PBO chopped 0.3% of the absolute dry mass sum of fiber and meta-aramid chopped fiber; finally add aramid according to the mass ratio of PBO chopped fiber, meta-aramid chopped fiber and meta-aramid precipitated fiber 3:1:6 Precipitate the fiber for the second dispersal of 10000r, add water to adjust the pulp mass concentration to 0.01%, and disperse for 2000r to obtain a mixed slurry; put the decomposed mixed slurry in a 200-mesh paper forming machine, and obtain a mixed paper by dehydra...
Embodiment 2
[0034]Absolutely dry PBO chopped fibers with a length of 8mm were immersed in a 5% NaOH solution for pretreatment, and then the pretreated PBO fibers were washed to neutral with deionized water, and dried for later use. Put the pretreated PBO chopped fiber and meta-aramid chopped fiber into the deflagging machine at the same time according to the ratio of mass ratio of 8:0 to decompose and disperse for 10000r, add polyethylene oxide as a dispersant during decomposing, and the amount added is PBO chopped 1.0% of the absolute dry mass sum of fibers and meta-aramid chopped fibers; finally add aramid according to the mass ratio of PBO chopped fibers, meta-aramid chopped fibers, and meta-aramid precipitated fibers 8:0:2 Precipitate the fiber for the second dispersal of 10000r, add water to adjust the pulp mass concentration to 0.05% and disperse for 2000r to obtain a mixed slurry; put the dehydrated mixed slurry in a 200-mesh paper forming machine, and obtain a mixed paper by dehydr...
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