Preparation method of acrylonitrile copolymer spinning solution with low molecular weight distribution
A low-molecular-weight, acrylonitrile technology, applied in the direction of single-component synthetic polymer rayon, textiles and papermaking, fiber chemical characteristics, etc., can solve the problems of increased molecular weight distribution index of polymers, small molecular weight of polymers, etc., to achieve the method Simple, easy-to-craft effect
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Embodiment 1
[0027] In the present embodiment, the preparation method of acrylonitrile copolymer spinning solution comprises the following steps:
[0028] (1) Accurately take by weighing 13.30kg dimethyl sulfoxide, 0.088kg itaconic acid, 3.88kg acrylonitrile, 0.044kg azobisisobutyronitrile, and join successively in the reactor with condenser and mechanical stirring device, Under the protection of nitrogen, stir at room temperature for 20 minutes, then raise the temperature of the system to 60°C to allow the polymerization reaction of acrylonitrile and itaconic acid, which is used as the starting point of the polymerization reaction;
[0029] (2) After reacting the reaction system at a constant temperature of 60°C for 9 hours, add 0.42 kg of acrylonitrile to the reaction system, continue to stir and react at a constant temperature of 60°C for 13 hours, and then remove the residual monomers and bubbles in the system to obtain acrylonitrile copolymer Spinning solution B.
[0030] Measure the...
Embodiment 2
[0032] In the present embodiment, the preparation method of acrylonitrile copolymer spinning solution comprises the following steps:
[0033] (1) Accurately take by weighing 13.30kg dimethyl sulfoxide, 0.088kg itaconic acid, 3.67kg acrylonitrile, 0.044kg azobisisobutyronitrile, join successively in the reactor with condenser and mechanical stirring device, Under the protection of nitrogen, stir at room temperature for 20 minutes, then raise the temperature of the system to 65°C to allow the polymerization reaction of acrylonitrile and itaconic acid, which is used as the starting point of the polymerization reaction;
[0034] (2) After reacting the reaction system at a constant temperature of 60°C for 5 hours, add 0.63 kg of acrylonitrile in batches to the polymerization system within 3 hours, then stir the reaction system at a constant temperature of 65°C for 14 hours, and then remove the residual monomers in the system bodies and air bubbles to obtain acrylonitrile copolymer ...
Embodiment 3
[0043] In the present embodiment, the preparation method of acrylonitrile copolymer spinning solution comprises the following steps:
[0044] (1) Accurately weigh 13.30kg dimethyl sulfoxide, 0.066kg itaconic acid, 0.022kg methyl acrylate, 3.88kg acrylonitrile, 0.044kg azobisisobutyronitrile and add them to the In the reactor, under the protection of nitrogen, stir at room temperature for 20 minutes, then raise the temperature of the system to 65 ° C, so that acrylonitrile, itaconic acid, and methyl acrylate are polymerized, and this time is used as the starting point of the reaction;
[0045] (2) After reacting the reaction system at a constant temperature of 65°C for 8 hours, add 0.42 kg of acrylonitrile to the reaction system, continue to stir and react at a constant temperature of 65°C for 12 hours, and then remove the residual monomers and bubbles in the system to obtain acrylonitrile copolymer Textile spinning solution E.
[0046] Measure the weight-average molecular wei...
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