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Polyurea anti-corrosion coating

A technology of corrosion coating and polyurea, which is applied in the field of polyurea anti-corrosion coating and concrete parts to achieve excellent aging resistance, improved anti-corrosion performance, and improved adhesion

Inactive Publication Date: 2010-10-13
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the primer proposed in its patent is a one-component moisture-curing polyurethane-urea resin and micaceous iron oxide, and the scope of application is metal structures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation technology of above-mentioned isocyanate modified epoxy resin, this technology has the following steps:

[0035] The epoxy resin that has been diluted with a mixed solvent is added to the catalyst and stirred evenly, and then reacted with isocyanate under normal pressure at 50-100°C. The raw material components (% by weight) are as follows:

[0036] Isocyanate (50-100% of the theoretical amount calculated according to the hydroxyl content of the epoxy resin), epoxy resin,

[0037] Solvent (0-100% of the total amount of epoxy resin and isocyanate),

[0038] Catalyst (0-0.5% of the total amount of epoxy resin and isocyanate),

[0039] After the reaction is finished, a modified epoxy resin is obtained.

[0040] The preparation technology of above-mentioned polyurea, comprises the following steps:

[0041] Component A: Add the measured isocyanate into the reaction kettle, heat up while stirring, and add the measured other components (polyether polyol, etc...

Embodiment 1

[0055] 500ml four-neck glass flask, equipped with stirrer, thermometer and reflux condenser, add 616 # Add 0.02 gram of dibutyltin dilaurate to 300 grams of epoxy resin, heat and stir to raise the temperature to 50°C, then add 15.3 grams of molten toluene diisocyanate dropwise, the time for adding is 1.5 hours, and keep the reaction temperature at about 50°C during dropping. After the addition, the temperature was raised to 80° C., kept for 2 hours, cooled to room temperature and discharged to obtain a light yellow transparent viscous liquid, that is, an isocyanate-modified epoxy resin.

[0056] Get 100 grams of the modified epoxy resin obtained above, add 39 grams of T403 amino-terminated polyether, mix well, add a small amount of butanone and propylene glycol methyl ether acetate mixed solvent (butanone: propylene glycol methyl ether acetate=2: 1, Weight ratio), adjust the viscosity to 30-40 seconds (coat 4 cups), and then spray on the surface of concrete parts; it will be d...

Embodiment 2

[0065] 500ml four-necked glass flask, equipped with a stirrer, thermometer and reflux condenser, add 150 grams of 601 epoxy resin to the flask, then add 75 grams of methyl isobutyl ketone, 75 grams of ethylene glycol butyl ether, heat to 50 ° C and stir , until the epoxy resin becomes a transparent solution, then add 0.01 g of dibutyltin dilaurate and stir evenly. At 50°C, add 35 g of molten toluene diisocyanate dropwise for 1.5 hours at 50°C. After the addition is completed, , heated up to 80°C, kept warm for 2 hours, then cooled to room temperature and discharged to obtain a light yellow transparent viscous liquid, namely isocyanate-modified epoxy resin.

[0066] The preparation process of the remaining coated products is the same as in Example 1.

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PUM

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Abstract

This invention relates to a carbamide anticorrosion insulation, and it includes underlayer and at least one surface layer. The underlayer is isocyanate modified epoxide resin, and Amino Terminated polyether is used as curing agent. The surface layer is carbamide. Comparing with present technology, this invention provides a anticorrosion composite insulation using at the surface of concrete. The adhesive power of carbamide insulation and its anticorrosion ability is improved by using epoxide resin underlayer.

Description

technical field [0001] The present invention relates to coatings, in particular to a polyurea anti-corrosion coating used on the surface of concrete parts, especially suitable for concrete parts exposed to severe corrosion environments, such as: seawall slope protection, bridge piers, port facilities, elevated columns etc., it has a good protection and decoration effect. Background technique [0002] Large concrete parts in harsh environments such as the ocean are severely corroded. In order to ensure long-term performance, it is necessary to adopt surface protection measures. However, traditional alkyd coatings, phenolic coatings, etc. will bring many problems. In addition to the coating film performance not meeting the requirements, the application of these coatings is limited due to the harsh on-site environment. At the same time, due to the construction requirements of these coatings, the construction period is also extended. For example: traditional coatings are appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/02C09D5/08
Inventor 姚中恒施杰朱荣道李伟海
Owner SHANGHAI RES INST OF MATERIALS CO LTD