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A kind of polyurethane dispersant and its preparation method and application
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A technology of polyurethane dispersant and polymerization reaction, which is applied in the direction of botanical equipment and methods, applications, biocides, etc., and can solve the problems of poor storage stability and the like
Active Publication Date: 2022-06-07
文水县是大高分子材料有限公司
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[0003] Pesticide suspension concentrate (suspension concentrate, SC) is an excellent pesticide dosage form with good safety, high efficiency and environmental protection. To solve the problem of poor storage stability, it is very important to improve the dispersion stability of pesticide SC
Regarding pesticide SC, many polymer dispersants have been used in China, but there is still a lot of room for improvement.
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[0030] The invention provides a preparation method of a polyurethane dispersant, comprising the following steps:
[0031] Mixing polypropylene glycol, 2,2-dimethylolpropionic acid, aromatic isocyanate and organotin catalyst to carry out a first polymerization reaction to obtain a prepolymer;
[0032] Mixing the prepolymer with the ketone solution of 1,4-butanediol to carry out a second polymerization reaction to obtain a chain-extended polymer;
[0033] Mixing the chain extension polymer and polyethylene glycol, and carrying out a polycondensation reaction to obtain a polycondensate;
[0034] Mixing described polycondensate and neutralizing agent, carry out neutralization reaction, obtain polycondensate solution;
[0035] The polycondensate solution was mixed with water and emulsified to obtain a polyurethane dispersant.
[0036] In the present invention, the preparation method of the polyurethane dispersant is as follows figure 1 As shown, the present invention adopts the ...
Embodiment 1
[0071] The polyurethane dispersant was prepared by the prepolymer dispersion method:
[0072] PPG and DMPA were added to a four-necked flask equipped with a mechanical stirrer, thermometer, condenser and nitrogen inlet, and heated and stirred at 60 °C for 30 min to obtain a homogeneous mixture; cooled to 50 °C, TDI and 0.02 g DBTDL were added to the flask. The mixture was fully stirred, and the temperature was raised to 80 °C to carry out the first polymerization reaction for 2.5 h to obtain a prepolymer;
[0073] Then the temperature was lowered to 60°C, BDO dissolved in 20g of acetone was added dropwise to the prepolymer within 20min, and the second polymerization reaction was carried out at 60°C for 3.5h until the theoretical content of -NCO groups (by two N-butylamine titration method) to obtain chain-extended polymer;
[0074] Then, PEG with different molecular weights was added at 50°C for end-capping for 3h to obtain a polycondensate;
[0075] The polycondensate was c...
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Abstract
The invention provides a polyurethane dispersant, a preparation method and application thereof, and relates to the technical field of dispersants. The preparation method provided by the present invention comprises the following steps: mixing polypropylene glycol, 2,2-dimethylol propionic acid, aromatic isocyanate and an organotin catalyst, and performing a first polymerization reaction to obtain a prepolymer; The polymer is mixed with the ketone solution of 1,4-butanediol, and the second polymerization reaction is carried out to obtain a chain-extended polymer; the chain-extended polymer is mixed with polyethylene glycol, and a polycondensation reaction is carried out to obtain a polycondensate; The polycondensate is mixed with a neutralizing agent for neutralization reaction to obtain a polycondensate solution; the polycondensate solution is mixed with water for emulsification to obtain a polyurethane dispersant. The polyurethane dispersant prepared by the invention can significantly improve the storage stability of the pesticide aqueous suspension.
Description
technical field [0001] The invention relates to the technical field of dispersants, in particular to a polyurethane dispersant and a preparation method and application thereof. Background technique [0002] The molecular structure of polyurethane dispersant (PUD) has good controllability. It can be designed to have a longer molecular chain or solvated segment. Different active functional groups on the longer molecular chain can provide a large number of anchor points, while The introduction of solvated segments can enhance steric hindrance. At present, polyurethane dispersants are mainly used to disperse inorganic pigments and fillers in formulations such as inks and coatings. Paints, Prog.Color.Coat.7(2014)147-154) synthesized linear, branched and and hyperbranched anionic PUD, and studied their dispersibility of titanium dioxide in the formulation of water-based coatings; M.L.Hsaing et al. .Polym.Sci.96 (2005) 103-111) synthesized three anionic polyurethane ionomer disp...
Claims
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