Polyvinyl butyral preparation method
A technology of polyvinyl butyral and polyvinyl alcohol, applied in the field of polymer chemistry, can solve the problems of poor thermal stability of PVB film strength polyvinyl butyral, etc., and achieve the effect of significant technological progress
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Embodiment 1
[0019] Add 6000kg of deionized water into a 10000L (10T) enamel reaction kettle with a stirring, heating and dropping system, add 750kg of polyvinyl alcohol under stirring at 80r / min, and raise the temperature to 95±1°C. Dissolve polyvinyl alcohol (PVA) in 4 hours, then, when the dissolved PVA is cooled to 20±2°C, add 1500 kg of hydrochloric acid solution with a mass percent solubility of 2.5% in 30 minutes, and cool to 10±2°C after adding the acid 2°C, first drop 300kg of n-butyraldehyde into the acidic PVA solution; the dropping time is 40min; the stirring speed is 150r / min; Next, add the remaining 150kg of n-butyraldehyde dropwise in 30min. After adding n-butyraldehyde dropwise, keep the reaction at 10±2°C for 60 minutes; then, heat it to 64±1°C at a heating rate of 10°C / h, and keep it at this temperature for 90 minutes. After the reaction, the reaction mass was cooled to 30°C. The material PVB is moved to the centrifuge for dehydration, so that the moisture content is le...
Embodiment 2
[0023] Add 6000kg of deionized water into a 10000L (10T) enamel reaction kettle with a stirring, heating and dropping system, add 750kg of polyvinyl alcohol under stirring at 80r / min, and raise the temperature to 95±1°C. Dissolve polyvinyl alcohol (PVA) in 4 hours, then, when the dissolved PVA is cooled to 20±2°C, add 1500 kg of hydrochloric acid solution with a mass percent solubility of 2.5% in 30 minutes, and cool to 10±2°C after adding the acid 2°C, first drop 300kg of n-butyraldehyde into the acidic PVA solution; the dropping time is 40min; the stirring speed is 150r / min; Next, add the remaining 150kg of n-butyraldehyde dropwise in 30min. After adding n-butyraldehyde dropwise, keep the reaction at 10±2°C for 60 minutes; then, heat it to 64±1°C at a heating rate of 10°C / h, and keep it at this temperature for 90 minutes. After the reaction, the reaction mass was cooled to 30°C. The material PVB is moved to the centrifuge for dehydration, so that the moisture content is le...
Embodiment 3
[0027] Add 6000kg of deionized water into a 10000L (10T) enamel reaction kettle with a stirring, heating and dropping system, add 750kg of polyvinyl alcohol under stirring at 80r / min, and raise the temperature to 85±2°C. Dissolve polyvinyl alcohol (PVA) in 4 hours, then, when the dissolved PVA is cooled to 20±2°C, add 1500 kg of hydrochloric acid solution with a mass percent solubility of 2.5% in 30 minutes, and cool to 10±2°C after adding the acid 2°C, first drop 300kg of n-butyraldehyde into the acidic PVA solution; the dropping time is 40min; the stirring speed is 150r / min; Next, add the remaining 150kg of n-butyraldehyde dropwise in 30min. After adding n-butyraldehyde dropwise, keep the reaction at 10±2°C for 60 minutes; then, heat it to 64±1°C at a heating rate of 10°C / h, and keep it at this temperature for 90 minutes. After the reaction, the reaction mass was cooled to 30°C. The material PVB is moved to the centrifuge for dehydration, so that the moisture content is le...
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