Rapid dissolving method for ultrahigh molecular weight polyacrylonitrile
An ultra-high molecular weight, polyacrylonitrile technology, applied in the direction of spinning solution preparation, etc., can solve the problems of unable to prepare polymer solution, difficult to control the dissolution process, unstable factors, etc., to achieve shortened swelling time, low dissolution temperature, The effect of reducing production costs
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Embodiment 1
[0023] Add 7L solvent DMSO into the 10L dissolving kettle first, stir at 600-650 rpm, and control the temperature at 18-20℃; add a certain amount of ultra-high molecular weight polyacrylonitrile powder (M w = 1.57 million, M w / M η =1.82) Milling, 200 mesh sieving;
[0024] While stirring, slowly put the ultra-high molecular weight polyacrylonitrile powder into the dissolving kettle; then keep stirring and slowly raise the temperature to 60°C for 6 hours; through observation, it is found that there is no gel mass and the material is discharged, which may be intercepted by the filter The resulting gel mass contains 1% solids.
Embodiment 2
[0026] Add 7L solvent DMSO into the 10L dissolving kettle first, stir at 600-650 rpm, and control the temperature at 18-20℃; add a certain amount of ultra-high molecular weight polyacrylonitrile powder (M w = 1.57 million, M w / M η =1.82) Milling, 200 mesh sieving;
[0027] While stirring, slowly put the ultra-high molecular weight polyacrylonitrile powder into the dissolving kettle; then keep stirring and slowly raise the temperature to 75°C for 7 hours; through observation, it is found that there is no gel mass and the material is discharged, which may be intercepted by the filter The resulting gel mass contains 2% solids.
Embodiment 3
[0029] Add 5L solvent DMSO into the 10L dissolving kettle first, stir at 650-700 revolutions / min, and control the temperature at 18-20℃; add a certain amount of ultra-high molecular weight polyacrylonitrile powder (M w = 2.98 million, M w / M η =1.93) Milling, 200 mesh screen;
[0030] While stirring, slowly put the ultra-high molecular weight polyacrylonitrile powder into the dissolving kettle; then keep stirring, slowly increase the temperature to 80°C, and continue for 10 hours; through observation, it is found that there is no gel mass and the material is discharged, which may be intercepted by the filter The resulting gel mass contains 5% solid content.
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