Aqueous polyurethane coating and preparation method thereof

A water-based polyurethane and coating technology, applied in antifouling/underwater coatings, coatings, and biocide-containing paints, etc., can solve the problems of poor hardness, insufficient cross-linking degree, and poor adhesion of water-based polyurethane coatings. Achieve improved adhesion, improved strength and surface finish, and extended life

Inactive Publication Date: 2018-05-01
周华健
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the waterborne polyurethanes synthesized by traditional methods have a linear structure and insufficient crosslinking degree when curing, resulting in the common problems of poor hardness, poor adhesion and poor water resistance of waterborne polyurethane coating films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A water-based polyurethane coating, its composition by weight: 9.2 parts of hexamethylene diisocyanate trimer, 4.6 parts of dimethylol propionic acid, 17.1 parts of polyethylene glycol 1000, 6.8 parts of dimethylformamide, 3.4 parts of isophorone diisocyanate, 3.5 parts of triethylamine, 0.9 part of trimethylolpropane, 52.4 parts of water, 0.3 part of dibutyltin dilaurate and 36.2 parts of isocyanate curing agent; its preparation method comprises the following steps:

[0023] a. Add polyethylene glycol 1000, dimethylolpropionic acid, 0.2 parts of dibutyltin dilaurate and solvent dimethylol to a four-neck flask equipped with a stirrer, thermometer, condenser tube and constant pressure dropping funnel Add the weighed hexamethylene diisocyanate trimer to the above mixture dropwise within 30 min, and react at 50°C for 2 h, then raise the temperature to 60°C, and continue the reaction for 1 h, every The mass percentage of -NCO group of 0.5 h sampling measurement system, unti...

Embodiment 2

[0035] A water-based polyurethane coating, its composition by weight: 9.3 parts of hexamethylene diisocyanate trimer, 4.5 parts of dimethylol propionic acid, 17.4 parts of polyethylene glycol 1000, 6.7 parts of dimethylformamide, 3.6 parts of isophorone diisocyanate, 3.4 parts of triethylamine, 1.5 parts of trimethylolpropane, 52.8 parts of water, 0.3 part of dibutyltin dilaurate and 38.2 parts of isocyanate curing agent; its preparation method comprises the following steps:

[0036] a. Add polyethylene glycol 1000, dimethylolpropionic acid, 0.2 parts of dibutyltin dilaurate and solvent dimethylol to a four-neck flask equipped with a stirrer, thermometer, condenser tube and constant pressure dropping funnel Add the weighed hexamethylene diisocyanate trimer to the above mixture dropwise within 30 min, and react at 50 °C for 2 h, then raise the temperature to 60 °C, and continue the reaction for 1 h, every The mass percentage of -NCO group of 0.5 h sampling measurement system, u...

Embodiment 3

[0048] A water-based polyurethane coating, its composition by weight: 9.4 parts of hexamethylene diisocyanate trimer, 4.8 parts of dimethylol propionic acid, 18.0 parts of polyethylene glycol 1000, 7.0 parts of dimethylformamide, 3.8 parts of isophorone diisocyanate, 3.6 parts of triethylamine, 2.1 parts of trimethylolpropane, 53.0 parts of water, 0.5 part of dibutyltin dilaurate and 40.2 parts of isocyanate curing agent; its preparation method comprises the following steps:

[0049] a. Add polyethylene glycol 1000, dimethylolpropionic acid, 0.3 parts of dibutyltin dilaurate and solvent dimethylol to a four-necked flask equipped with a stirrer, thermometer, condenser tube and constant pressure dropping funnel Add the weighed hexamethylene diisocyanate trimer to the above mixture dropwise within 30 min, and react at 55 °C for 2 h, then raise the temperature to 65 °C, and continue the reaction for 1 h, every The mass percentage of -NCO group of 0.5 h sampling measurement system,...

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Abstract

The invention belongs to the technical field of environment-friendly coating preparation, and particularly relates to an aqueous polyurethane coating and a preparation method thereof. The aqueous polyurethane coating is prepared from the following components: hexamethylene diisocyanate trimer, dimethylol propionic acid, polyethylene glycol 1000, dimethylformamide, isophorone diisocyanate, triethylamine, trimethylolpropane, water, dibutyltin dilaurate, and isocyanate curing agent; the hexamethylene diisocyanate trimer is used as a raw material of the aqueous polyurethane coating to prepare water-based polyol with polyfunctionality, and greatly increases cross-linking density of a coating film; at the same time, by adding a trimethylolpropane aqueous solution into aqueous polyurethane polyol, the mass fraction of -OH in aqueous polyurethane is effectively improved, the adjustment of hardness of an aqueous polyurethane film is realized, the scrub resistance and wear resistance of the two-component aqueous polyurethane film are greatly improved, and the strength and surface finish of the aqueous polyurethane film are also improved; and, at the same time, the service life of the coatingis prolonged.

Description

technical field [0001] The invention belongs to the technical field of preparation of environment-friendly coatings, and in particular relates to a water-based polyurethane coating and a preparation method thereof. Background technique [0002] Coatings belong to organic chemical polymer materials, and the formed coating film belongs to the type of polymer compounds. According to the classification of modern chemical products, coatings belong to fine chemical products. Modern coatings are gradually becoming a class of multifunctional engineering materials and an important industry in the chemical industry. There are four main functions: protection, decoration, concealing product defects and other special functions, and enhancing the value of the product. [0003] Two-component polyurethane coatings have excellent properties such as low film-forming temperature, strong adhesion, good wear resistance, high hardness, chemical resistance, and good weather resistance, so they a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D5/16C08G18/79C08G18/75C08G18/66C08G18/48C08G18/34C08G18/32
CPCC09D175/08C08G18/4833C08G18/6677C08G18/6692C08G18/725C08G18/755C08G18/792C09D5/1662
Inventor 周华健罗曾莉闵名思
Owner 周华健
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