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A kind of colored polyurethane emulsion for waterproof coating and preparation method thereof

A polyurethane emulsion and waterproof coating technology, applied in the field of polyurethane emulsion and its preparation, can solve the problems of difficult combination of pigments, easy discoloration of coatings, poor color reproduction effect, etc., and achieve improved tensile strength, extensibility, and good flexibility and ductility, enhance the effect of emulsification

Active Publication Date: 2017-02-15
佛山市顺德区巴德富实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high reactivity of the polyurethane prepolymer, when the mixture of post-treatment materials and pigments is added, the organic combination of the pigment and the molecular chain of the prepolymer is difficult, which greatly affects the color development of the pigment after adding, making the coating Color reproduction is poor after use
In addition, it is difficult for the pigment to combine with the molecular chain of the prepolymer, so that there are more free pigment groups in the coating, which seriously affects the stability of the pigment after use, and makes the coating prone to discoloration, fading, powdering, etc. after use, and After the pigment is precipitated, it will pollute the environment
In addition, after the completion of the existing polyurethane prepolymer reaction, it needs to undergo a secondary reaction with the post-treatment material, and multi-step additional processes are required when mixing the pigment and the post-treatment material. Therefore, the production process of the traditional one-component polyurethane colored waterproof coating quite complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The preparation method of the colored polyurethane emulsion that is used for waterproof coating of the present invention comprises the following steps:

[0037] a: Weigh the raw materials according to the above ratio for later use;

[0038] b: Add polyglycol to a flask equipped with a stirrer, and dehydrate at 100-120°C for 1-3 hours in a vacuum environment before use;

[0039] c: Cool down the mixture in step b to 70-90°C, add a hydrophilic chain extender, and dehydrate in a vacuum environment for 1-2 hours before use;

[0040] d: Introduce nitrogen into the mixture in step c, cool down the flask to 50-70°C, add aromatic diisocyanate to react for 1-3 hours, and then perform the first measurement of isocyanate group value (NCO value);

[0041] e: add the main chain extender and the color chain extender dropwise to the mixture obtained in step d within 20-40 minutes at 50-70°C;

[0042]f: Add acetone to the mixture in step e to reduce the viscosity of the mixture, and ...

Embodiment 1

[0050] The colored polyurethane emulsion that is used for waterproof coating of the present invention mainly comprises water, toluene diisocyanate, polypropylene glycol, dimethylol propionic acid, 1,4-butanediol, ethylenediamine, triethylamine and 1,4-bis (2-Hydroxyethylamino)anthracene-9,10-dione (blue chain extender), the above components are calculated in parts by mass: water: 100 parts; toluene diisocyanate: 10 parts; polypropylene glycol: 15 parts; dimethylolpropionic acid: 1 part; 1,4-butanediol: 2 parts; ethylenediamine: 1 part; triethylamine: 1 part; 1,4-bis(2-hydroxyethylamino ) Anthracene-9,10-dione: 1 part. The main chain of polyurethane is formed by the reaction of toluene diisocyanate and polypropylene glycol in the reaction system, and a macromolecular chain structure is formed under the step-by-step reaction of dimethylol propionic acid, 1,4-butanediol and ethylenediamine, while 1, 4-bis(2-hydroxyethylamino)anthracene-9,10-dione is grafted on the molecular chai...

Embodiment 2

[0064] The colored polyurethane emulsion that is used for waterproof paint of the present invention mainly comprises water, toluene diisocyanate, polypropylene glycol, dimethylol propionic acid, 1,4-butanediol, ethylenediamine, triethylamine and 1-(bis( 2-hydroxyethyl)amino)anthracene-9,10-dione (red chain extender), the above components are calculated in parts by mass: water: 100 parts; toluene diisocyanate: 13 parts; polypropylene glycol: 18 parts Parts; Dimethylolpropionic acid: 1 part; 1,4-Butanediol: 2 parts; Ethylenediamine: 2 parts; Triethylamine: 2 parts; 1-(bis(2-hydroxyethyl)amino) Anthracene-9,10-dione: 1 part. The main chain of polyurethane is formed by the reaction of toluene diisocyanate and polypropylene glycol in the reaction system, and a macromolecular chain structure is formed under the step-by-step reaction of dimethylol propionic acid, 1,4-butanediol and ethylenediamine, while 1- (Bis(2-hydroxyethyl)amino)anthracene-9,10-dione is grafted on the molecular ...

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Abstract

The invention discloses a colored polyurethane emulsion for waterproof coating, which is characterized in that: the colored polyurethane emulsion for waterproof coating includes aromatic diisocyanate, polyglycol, chain extender, organic neutralizer and water , the contents of the above components are calculated in parts by mass: water: 100 parts; aromatic diisocyanate: 10-20 parts; polyglycol: 15-30 parts; chain extender: 4-8 parts; organic neutralization Agent: 1-5 parts, the chain extender includes hydrophilic chain extender, main chain extender and post chain extender, the content of hydrophilic chain extender, main chain extender and post chain extender is by mass parts Calculations are: hydrophilic chain extender: 1-2 parts; main chain extender: 2-4 parts; post-chain extender: 1-2 parts. The colored polyurethane emulsion used for waterproof coatings of the present invention has excellent stability, mechanical properties and color development.

Description

technical field [0001] The invention relates to a polyurethane emulsion and a preparation method thereof, in particular to a colored polyurethane emulsion used for waterproof coatings and a preparation method thereof. Background technique [0002] Waterproof color paint is a commonly used exterior wall coating material for buildings at present. Its function is to form a dense film on the surface of the building through chemical reaction to prevent water leakage on the surface of the building, so as to reduce the moisture content of the building and improve the quality of the building. Excellent heat dissipation capacity, while coloring the exterior walls of buildings. Existing waterproof color coatings generally use isocyanate, polyether, etc. to form prepolymers containing isocyanate groups through addition polymerization, and add a mixture of post-processing materials and pigments in the prepolymer state, and form a single component after fully stirring. Polyurethane colo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C09D175/08
CPCC08G18/3206C08G18/3228C08G18/348C08G18/4825C08G18/6666C08G18/667C08G18/6674C08G18/6685C08G18/6692C08G18/7614C09D175/08
Inventor 熊峰杨文涛
Owner 佛山市顺德区巴德富实业有限公司
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