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Synthetic method for waterborne polyurethane based on acetone process

A technology for water-based polyurethane and synthesis method, which is applied in the field of water-based polyurethane synthesis based on the acetone method, can solve the problems of insignificant reduction of viscosity, poor uniformity of reaction temperature, large amount of solvent used, etc., and achieves suppression of side reactions such as polyurea, Uniform temperature and good batch stability

Inactive Publication Date: 2016-12-21
SHANGHAI WEIKAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current production process is to add a large amount of solvent to reduce the viscosity of the prepolymer after chain extension. The amount of acetone used in water-based polyurethane products is about 30%-40%. Solvent recovery requires a lot of energy and pollutes the environment.
After the solvent is added, it cannot destroy the strong hydrogen bond between molecules, so increasing the amount of solvent has no obvious effect on reducing the viscosity. The solvent can only inhibit the gel reaction, so the amount of solvent used is very large, and the reaction temperature Poor uniformity, more side reactions, resulting in poor emulsion performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a kind of preparation method based on the waterborne polyurethane resin of acetone method, and the method comprises the following processing steps:

[0042] (1) Add 100 parts of polyester diol with a molecular weight of 2000 and 20 parts of acetone in a dry reaction kettle equipped with an agitator, a thermometer, and a reflux condenser, and stir and reflux to obtain material a; after 30 minutes, pour into material a Add 95 parts of isophorone diisocyanate, raise the temperature to 80°C and carry out polymerization reaction for 3 hours to obtain material b;

[0043] (2) Add 22 parts of dimethylolpropionic acid to material b, maintain the temperature at 80° C., 15 parts of acetone, and keep warm for 1 hour to obtain material c;

[0044] (3) Add 11 parts of TMP and 20 parts of acetone to material c. Maintain the temperature at 75°C and keep it warm for 1 hour to obtain material d;

[0045] (4) Add 14.9 parts of triethylamine to material d...

Embodiment 2

[0050] The present embodiment provides a kind of preparation method based on the waterborne polyurethane resin of acetone method, and the method comprises the following processing steps:

[0051] (1) In a dry reaction kettle equipped with an agitator, a thermometer, and a reflux condenser, add 100 parts of polyester diol with a molecular weight of 2000 and 30 parts of acetone, stir and reflux to obtain material a; after 30 minutes, add Add 104 parts of isophorone diisocyanate, heat up to 80°C for polymerization reaction for 3 hours to obtain material b;

[0052] (2) When the content of isocyanate groups in the material b reaches the theoretical value, add 30 parts of dimethylolpropionic acid to the material b, maintain the temperature at 80° C., 20 parts of acetone, and keep it warm for 1 hour to obtain the material c;

[0053] (3) When the isocyanate group content in material c reaches the theoretical value, add 9 parts of TMP and 25 parts of acetone to material c. Maintain ...

Embodiment 3

[0059] The present embodiment provides a kind of preparation method based on the waterborne polyurethane resin of acetone method, and the method comprises the following processing steps:

[0060] (1) Add 100 parts of polyester diol with a molecular weight of 2000 and 10 parts of acetone into a drying reactor equipped with an agitator, a thermometer and a reflux condenser, and stir and reflux to obtain material a. After 30 minutes, add 80 parts of isophorone diisocyanate to the material a, raise the temperature to 80° C. and carry out the polymerization reaction for 3 hours to obtain the material b;

[0061] (2) When the content of isocyanate groups in the material b reaches the theoretical value, add 20 parts of dimethylolpropionic acid to the material b, maintain the temperature at 80° C., 25 parts of acetone, and keep it warm for 1 hour to obtain the material c;

[0062] (3) When the isocyanate group content in material c reaches the theoretical value, add 8 parts of TMP and...

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Abstract

The invention provides a synthetic method for waterborne polyurethane based on an acetone process. The synthetic method comprises the following steps: dilution and reflux; pre-polymerization; chain extension; crosslinking; neutralization; dispersion and emulsification; and chain extension reaction. According to the invention, a solvent is added in a distribution way in the process of synthesis, so hydrogen bonds among molecular chains are destroyed, and material viscosity is lowered; heat released by reactions at every stage is removed in time and the interior of a reaction vessel has uniform temperature and is free of local hot spots, so side reaction is inhibited, and thus, temperature resistance and leveling performance of prepared waterborne polyurethane are improved; meanwhile, due to weak action of hydrogen bonds among molecules, emulsified micelles have small particle sizes and high storage stability; and the method is applicable to synthesis of polyurethane emulsion with a highly cross-linked structure and large-scale synthesis of waterborne polyurethane.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane synthesis, and relates to a water-based polyurethane synthesis method based on an acetone method. Background technique [0002] In the acetone method of water-based polyurethane synthesis to prepare prepolymers containing hydrophilic groups, after the addition of small molecule chain extenders and crosslinking agents, the molecular weight of the polymer increases, and hydrogen bonds are formed at the same time, causing the viscosity of the polymer to increase, so it is necessary to add acetone Wait for the low boiling point solvent to control the key system viscosity, and then add a large amount of water to complete the phase transition by high-speed dispersion. After the solvent is distilled off, the dispersed emulsion of water-based polyurethane is obtained. [0003] The current production process is to add a large amount of solvent to reduce the viscosity of the prepolymer afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/44C08G18/34C08G18/32C08G18/08
CPCC08G18/755C08G18/0823C08G18/348C08G18/42C08G18/44C08G18/6659
Inventor 董海普吴奎李斐王玉春
Owner SHANGHAI WEIKAI CHEM
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