Bio-based high-temperature-resistant polyamide composite material as well as low-temperature pre-polycondensation preparation method and application thereof
A low-temperature pre-polycondensation and composite material technology is applied in the preparation of polyamide materials, bio-based high-temperature polyamide composite materials, and in the field of low-temperature pre-polycondensation preparation, which can solve problems such as non-compliance with sustainable development and achieve easy engineering amplification , the effect of a wide range of sources and broad application prospects
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Embodiment 1
[0085] Preparation of prepolymer: Add 5 parts of para-aramid short fiber (about 1mm in length), 0.0025 parts of PVA and 316 parts of DMAc into a beater for shearing treatment, control the speed at 4000r / min, and last for more than 5min to form a short Fiber uniform dispersion, and then add the short fiber uniform dispersion and 38.74 parts of hexamethylenediamine into the glass reaction kettle, replace the air in the kettle with dry nitrogen three times, fill with dry nitrogen protection, start stirring and turn on the refrigeration, so that the inside of the kettle The temperature was lowered to -15°C and kept at this temperature for 0.5h; then a mixture of 25.74 parts of 2,5-furandicarboxylic acid chloride and 40.6 parts of terephthaloyl dichloride was added to the reaction kettle in batches, and the reaction system exothermed at this time. The temperature in the kettle is gradually increased, and the addition rate of the acid chloride monomer is controlled so that the final ...
Embodiment 2
[0088] Preparation of prepolymer: Add 1 part of PPTA short fiber (about 2mm in length), 0.001 part of PEG and 400 parts of DMF into the beater for shearing treatment, control the speed at 6000r / min, and last for more than 5min to form a uniform dispersion of short fibers , and then add the short fiber uniform dispersion and 1,7-heptanediamine into the glass reaction kettle, replace the air in the kettle with dry nitrogen three times, fill it with dry nitrogen protection, start stirring and turn on the refrigeration to reduce the temperature in the kettle to -15°C, and kept at this temperature for 0.5h; then a total of 10 parts of a mixture of 2,5-furandicarboxylic acid chloride and isophthaloyl dichloride (2,5-furandicarboxylic acid chloride accounted for 50wt%, The total molar weight of the acid chloride monomer is equal to the heptanediamine molar weight) in the reactor in batches, at this moment, the reaction system exothermic, and the temperature in the still rises graduall...
Embodiment 3
[0091] The prepolymer synthesis process is the same as in Example 1, except that the beater speed is 10000r / min, DMAc is replaced by the same amount of NMP, and 1,6-hexamethylenediamine is replaced by the same amount of 1,9-nonanediamine amine.
[0092] The preparation process of the bio-based high temperature resistant polyamide composite material is the same as in Example 1.
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