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Asphalt-based reactive polyurethane coating, as well as preparation method and application thereof

A polyurethane coating and reactive technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve problems such as segregation, product failure, and processing technology difficulties, and achieve good permeability, excellent aging resistance, and application wide range of effects

Inactive Publication Date: 2012-07-25
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large amount of polybutadiene products with active hydrogen, which makes the processing technology more difficult. At the same time, in the process of storage and use in the future, segregation and other phenomena are prone to occur, resulting in product failure, etc.

Method used

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  • Asphalt-based reactive polyurethane coating, as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0047] Preparation of NCO-terminated polyurethane prepolymer: Add the polyol A component into a four-necked flask, heat up to 100-120°C, preferably 100-110°C, vacuum dehydrate for 1-3h, preferably 2-2.5h, After that, it will be warmed to 60-80°C, preferably 65-70°C. Then add the stoichiometric excess polyisocyanate monomer component relative to polyol A into the four-necked flask, add chain extender C and other components if necessary, and slowly raise the temperature to 70-90°C, preferably 75-80°C , react for 1-3h, preferably 2-2.5h, and take out the prepolymer in the four-neck flask to obtain the desired NCO-terminated prepolymer component.

[0048] For the preparation of asphalt-based polyurethane coatings, the asphalt is heated to 100-200°C, preferably 110-180°C in advance, and the measured NCO-terminated polyurethane prepolymer or polyisocyanate monomer, polyol B, catalyst and optional Chain extender D, water remover, antioxidant, defoamer, filler and optional extender, ...

Embodiment 1

[0051]Preparation of NCO-terminated polyurethane prepolymer 1: 84.6g of Tdiol-2000 (propylene oxide polyol, weight-average molecular weight 2000, average functionality 2, Tianjin Third Petrochemical) component as polyol A was added Put it into a four-neck flask, raise the temperature to 108°C, vacuumize and dehydrate for 2 hours, and then warm it to 70°C. Then 200g of diphenylmethane diisocyanate (MDI-100, Yantai Wanhua) was added into the four-necked flask, and the temperature was slowly raised to 80°C, and the reaction was carried out for 2 hours, and the prepolymer in the four-necked flask was taken out to obtain the required 1 component of the prepolymer, the NCO wt.% of the prepared prepolymer is 20%.

[0052] The preparation of asphalt-based polyurethane coating 1, the asphalt is heated up to 180 ℃ in advance, with 3.0wt.% of the prepared prepolymer 1, 1.5wt.% TEP-330N (propylene oxide / ethylene oxide) as polyol B Alkane public polyol, Tianjin Sanpei Chemical, functional...

Embodiment 2

[0055] Preparation of NCO-terminated polyurethane prepolymer 2: 201.8g of PTMEG-2000 (polytetramethylene ether polyol, Japan Mitsubishi, weight average molecular weight 2000, functionality 2) component as polyol A is added to In the four-neck flask, the temperature was raised to 110°C, and the temperature was raised to 75°C after vacuum dehydration for 2 hours. Then add 100g of diphenylmethane diisocyanate (MDI-100, Yantai Wanhua) into the four-necked flask, slowly raise the temperature to 80°C, react for 2h, and take out the prepolymer in the four-necked flask to obtain the required 2 components of the prepolymer, the NCO wt.% of the prepared prepolymer is 5%.

[0056] The preparation of asphalt-based polyurethane coating 2, the asphalt is heated up to 150 ℃ in advance, with 15wt.% of the prepared prepolymer 2, 1.0wt.% TED-28 (propylene oxide / ethylene oxide) as polyol B Copolyol, Tianjin No. 3 Petrochemical, weight average molecular weight 4000, functionality 2), 0.5wt.% gly...

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Abstract

The invention provides an asphalt-based reactive polyurethane coating which is obtained by performing reaction on (1) polyisocyanate monomers or a (1') NCO-terminated polyurethane prepolymer and (2) asphalt in the presence of polylol B and a catalyst, as well as optional additives, namely a chain extender D, a water removing agent, an antioxidant, a defoaming agent, a filling material, a solvent, a ductility increasing agent and a plasticizer. The reactive asphalt-based polyurethane coating provided by the invention has the advantages of simple and environment-friendly processing technology, stable product performance and low cost. The coating (or a coat) provided by the invention has higher strength property, the tensile strength is 7-9MPa, the retention rate of the tensile strength after heating treatment is 115-130% (compared with that before heating treatment), and the elongation at break is 550-620%.

Description

technical field [0001] The invention relates to an asphalt-based reactive polyurethane coating and its application. Especially polyurethane coatings produced by chemical reaction of polyurethane materials and asphalt and its application. Background technique [0002] At present, the waterproof and anti-corrosion coatings used in the market mainly include polyurethane coatings, acrylic coatings and polymer modified emulsified asphalt waterproof coatings. Among them, polyurethane waterproof and anti-corrosion coatings have been widely used in various waterproof and anti-corrosion projects because of their excellent waterproof and anti-corrosion properties. The deformation has strong adaptability, and the construction and maintenance are convenient. Polyurethane waterproof and anti-corrosion coatings are divided into two-component polyurethane coatings and one-component polyurethane coatings. The advantages of two-component polyurethane coatings are relatively stable perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D175/06C09D175/08C09D5/08C08G18/64
Inventor 吴士超张昊盛基泰涂松华卫琦黄岐善丁建生
Owner WANHUA CHEM GRP CO LTD
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