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Non-isocyanate waterborne polyurea and preparation method thereof

A non-isocyanate, polyurea technology, applied in the polymer field, can solve the problems of polyurea infiltration and high construction requirements, and achieve the effects of improving mechanical properties, improving adhesion and prolonging gel time.

Inactive Publication Date: 2019-03-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For above-mentioned situation, the object of the present invention is to: provide a kind of non-isocyanate water-based polyurea and preparation method thereof, make it can effectively improve the wettability of polyurea coating to substrate, improve the adhesive force of polyurea coating to substrate, solve The above problems of polyurea wettability and high construction requirements

Method used

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  • Non-isocyanate waterborne polyurea and preparation method thereof
  • Non-isocyanate waterborne polyurea and preparation method thereof
  • Non-isocyanate waterborne polyurea and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A non-isocyanate water-based polyurea, containing the following components in parts by mass: 1,6-hexanediamine, 5.5 parts; dimethyl carbonate, 34 parts; sodium methoxide, 0.05 parts; diethylenetriamine, 1.2 parts; Acid tetrabutyl ester, 0.05 part; Amino-terminated polyether D230, 15 parts; Glacial acetic acid, 0.7 part; Deionized water, 45 parts; Concrete preparation steps are as follows:

[0022] (1) Weigh 1,6-hexamethylenediamine, sodium methoxide and dimethyl carbonate according to the above-mentioned mass fractions, first add dimethyl carbonate, start stirring, raise the temperature to 40~60°C, and start slowly dripping Add hexamethylenediamine, after the dropwise addition, raise the temperature to 70~100°C, remove methanol, and obtain a carbonate-terminated methyl carbamate oligomer after a reaction time of 8~24 hours;

[0023] (2) Add the hydrophilic chain extender diethylenetriamine dropwise to the carbonate-terminated methyl carbamate oligomer in the above prepa...

Embodiment 2

[0029] A non-isocyanate water-based polyurea, containing the following components in parts by mass: 1,4-butanediamine, 6.5 parts; dimethyl carbonate, 22 parts; sodium methoxide, 0.05 parts; diethylenetriamine, 1.4 parts; titanium Acid tetrabutyl ester, 0.05 part; Amino-terminated polyether D400, 18 parts; Glacial acetic acid, 0.8 part; Deionized water, 54 parts; Concrete preparation steps are as follows:

[0030] (1) Weigh 1,4-butylene diamine, sodium methoxide and dimethyl carbonate according to the above mass fractions, first add dimethyl carbonate, start stirring, raise the temperature to 40~60°C, and start slowly dripping Add 1,4-butanediamine, and after the dropwise addition, raise the temperature to 70~100°C to remove methanol, and obtain a carbonate-terminated methyl carbamate oligomer after a reaction time of 8~24 hours;

[0031] (2) Add the hydrophilic chain extender diethylenetriamine dropwise to the carbonate-terminated methyl carbamate oligomer in the above prepara...

Embodiment 3

[0037] A non-isocyanate water-based polyurea, containing the following components in parts by mass: 1,4-butanediamine, 7 parts; dimethyl carbonate, 30 parts; sodium methoxide, 0.05 parts; diethylenetriamine, 1.5 parts; titanium Acid tetrabutyl ester, 0.05 part; Amino-terminated polyether D230, 20 parts; Glacial acetic acid, 0.8 part; Deionized water, 54 parts; Concrete preparation steps are as follows:

[0038] (1) Weigh 1,4-butylene diamine, sodium methoxide and dimethyl carbonate according to the above mass fractions, first add dimethyl carbonate, start stirring, raise the temperature to 40~60°C, and start slowly dripping Add 1,4-butanediamine, and after the dropwise addition, raise the temperature to 70~100°C to remove methanol, and obtain a carbonate-terminated methyl carbamate oligomer after a reaction time of 8~24 hours;

[0039] (2) Add the hydrophilic chain extender diethylenetriamine dropwise to the carbonate-terminated methyl carbamate oligomer in the above preparati...

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Abstract

The invention discloses non-isocyanate waterborne polyurea and a preparation method thereof. The preparation method adopts one or more diamine to react with excessive alkyl carbonate to prepare terminated-alkyl carbonate amino methyl formate oligomer, then the terminated-alkyl carbonate amino methyl formate oligomer reacts with a hydrophilic chain expander to obtain polyurea oligomer comprising the hydrophilic chain expander, a terminated amino polyester is added, then a neutralizing agent is added for neutralizing, and deionized water is added under a high-speed stirring condition to performthedemulsification to obtain non-isocyanate waterborne polyurea. The preparation method of the invention is simple in process and pollution-free; the traditional polyurea preparation method is abandoned, the isocyanate monomer prepared by adopting toxic phosgene is omitted, and the process not only can save the energy, but also can protect the environment, and the application prospect for the economic development is wide.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and in particular relates to a preparation method of non-isocyanate waterborne polyurea. technical background [0002] Spray polyurea coating is a new type of green environmental protection coating developed following low or no pollution coating technologies such as high solid content coatings, water-based coatings, light-curing coatings, and powder coatings. Polyurea has attracted more and more attention due to its excellent characteristics and convenient construction performance, but polyurea also has shortcomings, such as: due to the rapid reaction of polyurea, it causes the invasion of the substrate when polyurea is cured Poor wettability, which leads to poor adhesion of the paint film to the substrate, which is likely to cause pathological conditions such as blistering and delamination of the paint film; moreover, special spraying equipment must be used for polyurea, which has relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G71/02
CPCC08G71/02
Inventor 赵本波程原李治韬刘文俊邓平李利明孙宏刚
Owner ZHONGBEI UNIV
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