A kind of polyvinyl butyral synthesis method based on homogeneous and heterogeneous two-stage reaction
A technology of polyvinyl butyral and a synthesis method, applied in the field of resin synthesis, can solve problems such as the influence of acetal degree, and achieve the effects of improving lipophilicity, reducing load, reducing load and transmission resistance
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[0017] A polyvinyl butyral synthetic method based on homogeneous and heterogeneous two-stage reactions, comprising the steps:
[0018] (1) prepare PVA aqueous solution, add part n-butyraldehyde, and add HCl solution, fully mix, react under homogeneous condition, obtain homogeneous solution;
[0019] (2) Dispersing the remaining n-butyraldehyde in the homogeneous solution described in step (1) in the form of droplets at one time, reacting under heterogeneous conditions, then heating up to continue the reaction until the reaction is completed, to obtain PVB slurry;
[0020] (3) Perform conventional filtration, washing, and drying on the PVB slurry to obtain PVB products.
[0021] Sampling and analysis of its degree of acetalization, hydroxyl value and viscosity of 5% ethanol solution.
Embodiment 1
[0023] Reaction conditions: the mass fraction of PVA in the PVA aqueous solution is 5%; add a small amount of n-butyraldehyde and HCl solution to form a homogeneous mixed solution, wherein the mass ratio of n-butyraldehyde to PVA is 0.06:1, and the mass ratio of HCl to PVA is 0.15 : 1, the massfraction of HCl in the HCl solution is 10%; The reaction temperature of homogeneous reaction is 35 ℃, and the time is 50min; The mass ratio of the initial PVA in the solution is 0.65:1; the reaction is continued for 3.0 hours at a reaction temperature of 65°C; and finally the temperature is lowered to 35°C.
[0024] Reaction results: the acetalization degree of the product PVB is 79.1%, the hydroxyl value is 18.3%, and the viscosity of 5% PVB ethanol solution is 89 mPa·s.
Embodiment 2
[0026] Reaction conditions: the mass fraction of PVA in the PVA aqueous solution is 15%; add a small amount of n-butyraldehyde and HCl solution to form a homogeneous mixed solution, wherein the mass ratio of n-butyraldehyde to PVA is 0.10:1, and the mass ratio of HCl to PVA is 0.10 : 1; the mass fraction of HCl in the HCl solution is 10.0%; the reaction temperature of the homogeneous reaction is 30 ℃, and the time is 90min; after the remaining n-butyraldehyde is added, the heterogeneous reaction is carried out for 0.5h. The mass ratio of the initial PVA in the solution is 0.64:1; then continue the reaction at a reaction temperature of 65°C for 2.0h; finally cool down to 30°C.
[0027] Reaction result: the degree of acetalization of the product PVB is 78.6%, the hydroxyl value is 19.3%, and the viscosity of 5% PVB ethanol solution is 80mPa·s.
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