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Polyurethane dispersant as well as preparation method and application thereof

A polyurethane dispersant, polymerization reaction technology, applied in the directions of botanical equipment and methods, applications, biocides, etc., can solve problems such as poor storage stability

Active Publication Date: 2021-03-12
文水县是大高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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.

Method used

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  • Polyurethane dispersant as well as preparation method and application thereof
  • Polyurethane dispersant as well as preparation method and application thereof
  • Polyurethane dispersant as well as preparation method and application thereof

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preparation example Construction

[0030] The invention provides a kind of preparation method of polyurethane dispersant, comprises the following steps:

[0031] Mixing polypropylene glycol, 2,2-dimethylolpropionic acid, aromatic isocyanate and an organotin catalyst for the first polymerization reaction to obtain a prepolymer;

[0032] mixing the prepolymer with a ketone solution of 1,4-butanediol to perform a second polymerization reaction to obtain a chain-extended polymer;

[0033] Mixing the chain-extended polymer and polyethylene glycol, and performing a polycondensation reaction to obtain a polycondensate;

[0034] Mixing the polycondensate and a neutralizing agent to carry out a neutralization reaction to obtain a polycondensate solution;

[0035] The polycondensate solution is mixed with water for emulsification to obtain a polyurethane dispersant.

[0036] In the present invention, the preparation method of the polyurethane dispersant is as follows figure 1 Shown, the present invention adopts prepol...

Embodiment 1

[0071] Prepare polyurethane dispersant by prepolymer dispersion method:

[0072] Add PPG and DMPA into a four-neck flask equipped with a mechanical stirrer, thermometer, condenser and nitrogen inlet, heat and stir at 60°C for 30min to obtain a homogeneous mixture; cool down to 50°C and add TDI and 0.02g DBTDL to the In the above mixture and fully stirred, the temperature was raised to 80°C for the first polymerization reaction for 2.5 hours to obtain a prepolymer;

[0073] Then the temperature was lowered to 60° C., and the BDO dissolved in 20 g of acetone was added dropwise to the prepolymer within 20 minutes, and maintained at 60° C. for the second polymerization reaction for 3.5 hours until reaching the theoretical content of —NCO group (through two N-butylamine titration method is measured), obtains chain-extended polymer;

[0074] Then at 50°C, PEGs of different molecular weights were added for capping for 3 hours to obtain polycondensates;

[0075] Cool the polycondens...

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Abstract

The invention provides a polyurethane dispersant as well as a preparation method and application thereof, and relates to the technical field of dispersants. The preparation method provided by the invention comprises the following steps: mixing polypropylene glycol, 2,2-dimethylolpropionic acid, aromatic isocyanate and an organic tin catalyst, and carrying out a first polymerization reaction to obtain a prepolymer; mixing the prepolymer with a ketone solution of 1,4-butanediol, and carrying out a second polymerization reaction to obtain a chain extension polymer; mixing the chain extension polymer with polyethylene glycol, and carrying out polycondensation reaction to obtain a polycondensate; mixing the polycondensate with a neutralizer, and carrying out neutralization reaction to obtain apolycondensate solution; and mixing the polycondensate solution with water, and emulsifying to obtain the polyurethane dispersant. By adopting the polyurethane dispersant prepared by the invention, the storage stability of a pesticide water suspending agent can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of dispersants, in particular to a polyurethane dispersant and its preparation method and application. Background technique [0002] The molecular structure of polyurethane dispersant (PUD) has good controllability, and it can be designed to have a longer molecular chain or solvated segment, and 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 the steric hindrance. At present, polyurethane dispersants are mainly used to disperse inorganic pigments and fillers in formulations such as inks and coatings, F.Najafi etc. Paints, Prog. Color. Coat. 7 (2014) 147-154) synthesized linear, branched and hyperbranched anionic PUDs, and studied their dispersibility to titanium dioxide in the formulation of water-based coatings; M.L.Hsaing et al. .Polym.Sci.96 (2005) 103-111) synthesized three kinds of an...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/12C08G18/66C08G18/48C08G18/34C08G18/32A01N25/04A01N43/653A01P3/00
CPCC08G18/7621C08G18/0823C08G18/12C08G18/348C08G18/48C08G18/6692C08G18/4833A01N25/04A01N43/653C08G18/3206
Inventor 任天瑞张博涂振北杨小东张明倩任云瑞
Owner 文水县是大高分子材料有限公司
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