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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 resultin

Method used

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  • Waterborne polyurethane for pigment dyeing and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

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

[0037] S101 Weigh polytetramethylene ether glycol: 2 parts by mass to 5 parts by mass; polycarbon polyol: 10 parts by mass to 15 parts by mass; hexamethylene diisocyanate: 40 parts by mass to 74 parts by mass, add a solvent In the reactor, a prepolymerization reaction occurs, and the reaction is performed for 2 hours, and then the solvent is removed to obtain a prepolymerization reaction product;

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

[0039] S103 neutralizes the surfactant in the polymerization reaction product wit...

Example Embodiment

[0049] Example 1:

[0050] Weigh polytetramethylene ether glycol: 2 parts by mass; polycarbon polyol: 10 parts by mass; hexamethylene diisocyanate: 42 parts by mass, the solvent is added to the reactor at a reaction temperature of 80°C, and a prepolymerization reaction occurs, The reaction is carried out for 2 hours, and then the solvent is removed, and the temperature of the solvent removal is 120°C to obtain a prepolymerized reaction product;

[0051] 2 parts by mass of monoethanolamine are added to the prepolymerization reaction product, and the pH regulator: 0.1 mass part is added to the prepolymerization reaction product, and the pH of the prepolymerization reaction product is adjusted to 4.0 to obtain an acid neutralization polymerization reaction product;

[0052] The surfactant in the polymerization reaction product is neutralized with acid, fully stirred evenly, and the stirring speed is 1500 r / min to obtain the water-based polyurethane for paint dyeing.

Example Embodiment

[0053] Example 2:

[0054] Weigh polytetramethylene ether glycol: 5 parts by mass; polycarbon polyol: 15 parts by mass; hexamethylene diisocyanate: 74 parts by mass, the solvent is added to the reactor at a reaction temperature of 100°C, and a prepolymerization reaction occurs, The reaction is carried out for 2 hours, and then the solvent is removed, and the temperature of the solvent removal is 150 °C to obtain a prepolymerized reaction product;

[0055] Add 10 parts by mass of monoethanolamine to the prepolymerized reaction product, add 1 mass part of a pH regulator, add the prepolymerized reaction product, adjust the pH of the prepolymerized 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 acid, fully stirs it evenly, and the stirring speed is 2000 r / min to obtain 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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