Method for producing an aqueous dispersion of poly(hydroxyalkanoates)
A technology of hydroxyalkanoate and hydroxybutyrate, which is applied in the field of preparing poly(hydroxyalkanoate) aqueous dispersions, can solve the problems that surfactants are not suitable for providing PHA stable dispersions, etc., and achieves easy implementation. Effect
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Embodiment 1
[0081] A high-viscosity poly(vinyl alcohol) (PVOH) stabilizer was used to prepare a dispersion of PHB powder with a solid content of 40%.
[0082] The shear rate is 8150s -1 Add 30g of 5% Mowiol 56-98 solution (available from Kuraray) to a reactor containing 40g PHB powder stirred by a high-speed disperser, and use a 4% by weight aqueous solution of Mowiol 56-98 at 20°C according to DIN 53015. 2 The measured viscosity of the ball is 56 mPa·s, and then 22 g of water and 0.12 g of defoamer (defoamer 101) are added. The mixture was stirred until homogeneous, and then 0.1 g of biocide (Acticide MBS 505010%) was added. The mixture was stirred for another 10 minutes to obtain a homogeneous dispersion with a total solids content of 41% and a pH of 7.7. The dispersion was placed at room temperature to test long-term stability. At regular intervals, visually inspect the product for precipitation and emulsification. Small samples from the top and bottom parts of the sample were also tak...
Embodiment 2
[0084] A low viscosity PVOH stabilizer was used to prepare a dispersion of PHB powder with a solid content of 40%.
[0085] The shear rate is 8150s -1 Add 30g of a 5% Mowiol 10-98 aqueous solution from Kuraray, and a 4% by weight aqueous solution of Mowiol 10-98 from Kuraray into a container containing 40g PHB powder stirred by a high-speed disperser. The measured viscosity was 10 mPa·s, and then 22 g of water and 0.12 g of defoamer (defoamer 101) were added. The mixture was stirred until homogeneous, and 0.1 g of biocide (Acticide MBS 505010%) was added. The mixture was stirred for another 10 minutes to obtain a homogeneous dispersion with a total solids content of 40% and a pH of 7.7. The dispersion was placed at room temperature to test long-term stability. At regular intervals, visually inspect the product for precipitation and emulsification. Samples from the top and bottom sections were also taken periodically to determine the total solid content (TSC) and to compare the...
Embodiment 3
[0087] A high-viscosity PVOH stabilizer is used to prepare a blend of a PHB dispersion with a solid content of 40% and a carboxylated styrene-butadiene copolymer emulsion.
[0088] The shear rate is 8150s -1 Add 40g of 5% Mowiol 56-98 aqueous solution (as in Example 1) to a container containing 32g PHB powder stirred by a high-speed disperser, then add 40g water and 0.12g defoamer (defoamer 101). The mixture was stirred until homogeneous, and 0.1 g of biocide (Acticide MBS 5050 10%) was added. The mixture was stirred for another 10 minutes, and then 60 g (20% by weight based on the amount of PHB) of carboxylated styrene-butadiene copolymer emulsion was added. The blended dispersion was stirred for 5 minutes to obtain a product with a TSC of 40% and a pH of 7.9. The dispersion was placed at room temperature to test long-term stability. Perform regular visual inspections of the product to determine whether precipitation and emulsification have occurred. Small samples are also ta...
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