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Aromatic single-component polyurea coating and preparation method thereof

A one-component, aromatic technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of limited hydrolysis resistance, unsatisfactory use, short service life, etc., to achieve excellent hydrolysis resistance, good environmental protection, Excellent wear resistance

Inactive Publication Date: 2020-06-30
HEBEI YUYANGZELI WATERPROOF MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current one-component polyurea is prepared from polyether polyol or amino-terminated polyether, the molecular chain contains a large number of ether bonds, the hydrolysis resistance is limited, and it will be hydrolyzed quickly in the protection system of heat, acid and alkali failure, very short service life
Although the hydrolysis resistance and wear resistance of polytetrahydrofuran ether glycol (PTMEG) have been greatly improved, it is not optimistic to use it under the conditions of acid, alkali and heat.
[0004] It can be seen from the above description that there is currently no effective measure to solve the problem of polyurea's hydrolysis resistance, especially in the protection system of heat, acid and alkali for a long time, and the service life is very short

Method used

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  • Aromatic single-component polyurea coating and preparation method thereof
  • Aromatic single-component polyurea coating and preparation method thereof
  • Aromatic single-component polyurea coating and preparation method thereof

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preparation example Construction

[0034] The application also provides a preparation method for the aromatic single-component polyurea coating, comprising the following steps:

[0035] A) According to the composition ratio, heat the polycarbonate diol, dimer acid polyester diol and hydroxyl-terminated liquid rubber in a vacuum to remove water and then add isocyanate to react;

[0036] B) Mix and heat the reaction product obtained in step A) with an adhesion promoter and an imine latent curing agent, then add an environmentally friendly diluent to cool down, and then add a catalyst and a defoamer to obtain an aromatic one-component polyurea coating.

[0037] In the preparation process of the above-mentioned aromatic single-component polyurea coating, in step A), the heating temperature is 110-120°C, the temperature for adding isocyanate is 60-65°C, and the reaction temperature is 80-120°C. 90°C for 2-3 hours; in step B), the heating temperature is 80-85°C, and the cooling temperature is 60-65°C.

[0038]The po...

Embodiment 1

[0041] An aromatic single-component polyurea coating, comprising the following components in mass fraction: 25% MDI, 50% polycarbonate diol 2000, 15% imine latent curing agent, 0.1% catalyst, 9.4% environmental protection dilution agent, 0.2% 3-isocyanatopropyl triethoxysilane, 0.3% defoamer.

[0042] Preparation method: 1) Put polycarbonate diol into a three-necked flask, heat to 110-120°C to remove moisture in a vacuum, cool to 60-65°C, add corresponding isocyanate, react at 80-90°C for 2 hours, then cool down to 65-70°C;

[0043] 2) Drop in the adhesion promoter and imine latent curing agent through the dropping device, and keep the reaction temperature balanced by setting the dropping speed. After the addition, keep it at 80-85°C for half an hour, add the environmentally friendly diluent and cool down by 60-65°C , add the corresponding defoamer, catalyst and stir for 15 minutes before discharging.

Embodiment 2

[0045] An aromatic single-component polyurea coating, comprising the following components in mass fraction: 20% TDI, 50% polycarbonate diol 2000, 12% imine latent curing agent, 0.1% catalyst, 0.2% 3- Isocyanatopropyltrimethoxysilane, 17.4% environmentally friendly thinner, 0.3% defoamer.

[0046] The preparation method is the same as in Example 1.

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Abstract

The invention provides an aromatic single-component polyurea coating. The aromatic single-component polyurea coating is prepared from isocyanate, polycarbonate diol, dimer acid polyester diol, hydroxyl-terminated liquid rubber, an imine latent curing agent, a catalyst, an environment-friendly diluent, an adhesion promoter and a defoaming agent. The invention further provides a preparation method of the aromatic single-component polyurea coating. The coating is a single component and is convenient to use, and a prepared polyurea coating layer has excellent tensile property, wear resistance, hydrolysis resistance, acid and alkali resistance and low VOC, can be used under the conditions of acid, alkali and heat, and can be applied to various occasions with waterproof and anticorrosive requirements under severe conditions.

Description

technical field [0001] The invention relates to the technical field of polyurea coatings, in particular to an aromatic single-component polyurea coating and a preparation method thereof. Background technique [0002] Polyurea coating has excellent wear-resistant, anti-corrosion and waterproof properties. It is widely used in various marine water conservancy dam projects, high-end building waterproofing and petrochemical fields in terms of waterproofing and anti-corrosion. It is specifically used in bridges, tunnels, aquariums, sports stands and various A large number of industrial anti-corrosion and waterproof applications. [0003] The gel time of the polyurea coating is too short, the wetting with the substrate is not enough, and the bond is not firm enough, which causes many disadvantages. At present, one-component polyurea has appeared on the market, which is easy to use and firmly bonded, which solves the pain point of spraying polyurea. However, the current one-compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D7/20C09D7/63C08G18/42C08G18/44C08G18/69
CPCC08G18/4202C08G18/4236C08G18/44C08G18/698C09D175/02C09D7/20C09D7/63C08K5/5465
Inventor 田继斌
Owner HEBEI YUYANGZELI WATERPROOF MATERIAL
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