Polyvinyl ether synthesis method
A polyvinyl ether and polyvinyl alcohol technology, applied in the field of organic synthesis, can solve the problems of high technical requirements, temperature sensitivity, and restrictions on the wide application of compounds, and achieve the effect of high purity and waste reduction
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[0015] Example 1
[0016] Synthesis of Polyvinyl Methyl Ether:
[0017] In a three-necked bottle equipped with a reflux water separator, add low-viscosity polyvinyl alcohol (average molecular weight: 16,000-20,000, 0.4 mol) and 20 ml of water, and dissolve completely under stirring. After adding strong acid cation exchange resin (0.4 mol) and tetrabutylammonium bromide (4 mmol), then adding methanol (2.0 mol) and 180 ml of toluene, heating at 110° C. and refluxing to separate water. After detecting that there is no more water out of the reaction, the reaction system is cooled down, and the solid obtained after filtration can be continuously used for synthesizing the reaction for 4-6 times to maintain the same activity. The organic layer was washed with saturated brine and distilled to obtain a 40% toluene solution of polyvinyl methyl ether.
Example Embodiment
[0018] Example 2
[0019] Synthesis of polyvinyl ether:
[0020] In a three-necked bottle equipped with a reflux water separator, add low-viscosity polyvinyl alcohol (average molecular weight: 16,000-20,000, 0.4 mol) and 22 ml of water, and dissolve completely under stirring. After adding strong acid cation exchange resin (0.4 mol) and trioctylmethyl ammonium chloride (5 mmol), then adding ethanol (2.5 mol) and 180 ml of toluene, heating at 110° C. and refluxing to separate water. After detecting that there is no more water out of the reaction, the reaction system is cooled down, and the solid obtained after filtration can be continuously used for synthesizing the reaction for 3-4 times to maintain the same activity. The organic layer was washed with saturated brine and distilled to obtain a 50% toluene solution of polyvinyl ether.
Example Embodiment
[0021] Example 3
[0022] Synthesis of polyvinyl n-butyl ether:
[0023] In a three-necked bottle equipped with a reflux water separator, add medium-viscosity polyvinyl alcohol (average molecular weight: 110,000-130,000, 0.4 mol) and 30 ml of water, and dissolve completely under stirring. After adding strong acid cation exchange resin (0.4 mol) and tetradecyl trimethyl ammonium chloride (8 mmol), then adding n-butanol (4.0 mol) and 220 ml of p-xylene, heating at 140 ° C and refluxing to separate water . After detecting that there is no more water out of the reaction, the reaction system is cooled down, and the solid obtained after filtration can be continuously used for synthesizing the reaction for 4-6 times to maintain the same activity. The organic layer was washed twice with saturated brine and distilled to obtain an 80% p-xylene solution of polyvinyl n-butyl ether.
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