Water-based PVB (polyvinyl butyral) emulsion and preparation method thereof
A water-based and emulsion technology, applied in the field of water-based PVB emulsion and its preparation, can solve the problem that the use of organic solvents cannot be completely avoided, and achieve the effect of avoiding the use of organic solvents and reducing water washing
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[0033] The preparation method of aqueous PVB emulsion, comprises the steps:
[0034] Step 1. Add 100 parts of PVA, 10-30 parts of water-soluble polyols, 0.2-0.5 parts of antioxidant, and 150-500 parts of deionized water into the reaction kettle, start stirring, and heat to 80-95°C to dissolve , to obtain an aqueous solution;
[0035] Step 2. Cool down the temperature of the aqueous solution in step 1 to 20-40°C, add 30-50 parts of butyraldehyde and 5-20 parts of water-soluble aldehyde in sequence, stir and mix well;
[0036] Step 3. Cool down the solution in step 2 to 5-10°C, add 10-20 parts of hydrochloric acid and mix well;
[0037] Step 4. Heat up the system in step 3 to 20-35°C until the system undergoes a transparent-blue-milky white transition (phase transition). When the milky white state appears, immediately add 10-20 parts of liquid caustic soda, stir well, and neutralize the system hydrochloric acid;
[0038] In step 5, the system in step 4 is distilled under redu...
Embodiment 1
[0044] Example 1: Add 200kg of deionized water into the reactor, which has a spiral stirring paddle and four flat baffles, and start stirring. Add 100kg of PVA, 20kg of polyethylene glycol 1000, and 0.3kg of antioxidant 1076 into the kettle, and raise the temperature to 90° C. to make an aqueous solution. Then the temperature was lowered to 30°C, and 45kg of butyraldehyde and 15kg of acetaldehyde were sequentially added; the temperature was continued to be lowered to 8°C, and 17kg of hydrochloric acid was added. Then heat up to 35°C at a rate of 20°C / h, and maintain at 35°C for a certain period of time, until the system undergoes a transparent-blue-milky white transition, immediately add about 17kg of liquid caustic soda, fully neutralize the hydrochloric acid in the system, and then distill under reduced pressure Get the product.
Embodiment 2
[0045] Example 2: Add 400 kg of deionized water into the reactor, which has a spiral stirring paddle and four flat baffles, and start stirring. Add 100kg of PVA, 15kg of water-soluble starch, and 0.4kg of antioxidant 1076 into the still, and heat up to 85°C to make an aqueous solution. Then cool down to 25°C, add 35kg of butyraldehyde and 20kg of formaldehyde in turn; continue to cool down to 10°C, add 15kg of hydrochloric acid. Then heat up to 30°C at a rate of 13°C / h, and maintain at 30°C for a certain period of time until the system undergoes a transparent-blue-milky white transition, and immediately add about 15kg of liquid caustic soda to fully neutralize the hydrochloric acid in the system, and then distill under reduced pressure. Get the product.
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