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Waterborne polyurethane for pigment dyeing and preparation method thereof

A water-based polyurethane and paint dyeing technology, which is applied in the direction of polyurea/polyurethane paint, coating, etc., can solve the problems of poor coating fastness of coating materials, unstable polyurethane, and hard hand feeling of coating materials, so as to achieve easy dyeing , good color fastness, little effect on hand feel

Inactive Publication Date: 2018-04-20
HUNAN XINLIHUA NANO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The polyurethane prepared by the polyurethane preparation method shown in the prior art usually changes the feel of the coating material during the process of being applied to the coating, often resulting in a harder hand of the coating material. At the same time, the coating of the coating material to the coating material Poor fastness, polyurethane is unstable and decomposes in acidic or alkaline environment

Method used

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  • Waterborne polyurethane for pigment dyeing and preparation method thereof

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preparation example Construction

[0036] The second aspect of the embodiment of the present application shows a kind of preparation method of water-based polyurethane for paint dyeing, please refer to figure 1 , the method includes:

[0037] S101 Weigh polytetramethylene ether glycol: 2-5 parts by mass; polycarbonate polyol: 10-15 parts by mass; hexamethylene diisocyanate: 40-74 parts by mass, add solvent In the reactor, a prepolymerization reaction takes place, reacts for 2h, and then removes the solvent to obtain a prepolymerization reaction product;

[0038] S102 Add 2 parts by mass to 10 parts by mass of monoethanolamine to the prepolymerization reaction product, add a pH regulator: 0.1 part by mass to 1 part by mass, add the prepolymerization reaction product, adjust the pH of the prepolymerization reaction product to 4.0-5.0, and obtain the acid Neutralize polymerization reaction products;

[0039] S103 neutralizes the surfactant in the polymerization reaction product with acid, and stirs well to obtai...

Embodiment 1

[0050] Weigh polytetramethylene ether glycol: 2 parts by mass; polycarbonate polyol: 10 parts by mass; hexamethylene diisocyanate: 42 parts by mass, add the solvent into the reactor at a reaction temperature of 80°C, and a prepolymerization reaction occurs. React for 2 hours, then remove the solvent, the temperature for removing the solvent is 120°C, and obtain the prepolymerized reaction product;

[0051] Add 2 parts by mass of monoethanolamine to the prepolymerization reaction product, add a pH regulator: 0.1 part by mass to the prepolymerization reaction product, adjust the pH of the prepolymerization reaction product to 4.0, and obtain an acid neutralization polymerization reaction product;

[0052] Neutralize the surfactant in the polymerization reaction product with the acid, stir well and evenly, and the stirring speed is 1500r / min, and obtain the water-based polyurethane for paint dyeing.

Embodiment 2

[0054] Weigh polytetramethylene ether glycol: 5 parts by mass; polycarbonate polyol: 15 parts by mass; hexamethylene diisocyanate: 74 parts by mass, and add the solvent into the reactor at a reaction temperature of 100°C, and a prepolymerization reaction occurs. React for 2 hours, then remove the solvent, the temperature for removing the solvent is 150°C, and obtain the prepolymerized reaction product;

[0055] Add 10 parts by mass of monoethanolamine to the prepolymerization reaction product, add 1 part by mass of pH regulator to the prepolymerization reaction product, adjust the pH of the prepolymerization reaction product to 4.0-5.0, and obtain an acid neutralization polymerization reaction product;

[0056] S103 neutralizes the surfactant in the polymerization reaction product with the acid, fully stirs evenly, and the stirring rate is 2000r / min, and obtains the water-based polyurethane for paint dyeing.

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Abstract

The embodiment of the application provides waterborne polyurethane for pigment dyeing and a preparation method thereof. The waterborne polyurethane comprises the following materials in parts by mass:2-5 parts of polytetramethylene ether glycol, 10-15 parts of polycarbonate polyol, 40-74 parts of hexamethylene diisocyanate, 2-10 parts of monoethanolamine, 0.1-1 part of a pH regulator, and 0.2-0.5part of a surfactant. According to the embodiment of the application, the waterborne polyurethane is easy to dye, causes little influence on the hand feeling of a coating material when prepared into acoating, and is excellent in color fastness, stable in performance and low in probability of decomposition in an acidic or alkaline environment.

Description

technical field [0001] The invention relates to the technical field of dye preparation, in particular to a water-based polyurethane for paint dyeing and a preparation method thereof. Background technique [0002] Coating is a supporting engineering material that is coated on the surface of an object and can form a continuous film that is firmly attached. It is widely used in industrial production and people's daily life, and plays an active role in protecting the substrate and beautifying the appearance. With the improvement of environmental protection regulations in various countries and the enhancement of people's awareness of environmental protection, the emissions of volatile organic compounds and harmful air pollutants in traditional solvent-based coatings are increasingly restricted, and the development of low-pollution, high-performance, multi-functional Environmentally friendly water-based coatings have become the main direction of coating technology development. Tw...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/44C09D175/08C09D175/04
CPCC08G18/44C08G18/4854C09D175/04C09D175/08
Inventor 詹国胜范友华
Owner HUNAN XINLIHUA NANO TECH
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