High-solid-content waterborne polyurethane dispersion solution based on amino carboxylate and amino sulfonate

Abstract

The invention discloses a high-solid-content waterborne polyurethane dispersion solution based on amino carboxylate and amino sulfonate. The waterborne polyurethane dispersion solution is prepared bythe following steps: firstly, adding polymer diol, lower molecular weight polyol, diisocyanate and other substances into a reactor to generate a pre-polymer; after generating the pre-polymer, reducingthe system viscosity by utilizing acetone; then carrying out first-time chain extension reaction by utilizing an amino carboxylate hydrophilic chain-extending agent; then adding a neutralizing agentand regulating the pH (Potential of Hydrogen) value; then adding de-ionized water as a solvent and adding an amino sulfonate hydrophilic chain-extending agent and other substances to be subjected to second-time chain extension reaction; after decompressing and distilling to remove the acetone, preparing the waterborne polyurethane dispersion solution. The prepared waterborne polyurethane dispersion solution has high solid content and a rapid drying speed; the energy consumption is reduced and the waterborne polyurethane dispersion solution is easy to popularize so that waterborne polyurethaneis really used by everyone and every family; meanwhile, the waterborne polyurethane dispersion solution has very good tensile strength and elongation at break; after the waterborne polyurethane dispersion solution is irradiated by an ultraviolet lamp for long time, the change of the tensile strength is relatively small and the waterborne polyurethane dispersion solution still has very good application value.

Description

technical field [0001] The present invention relates to a kind of aqueous polyurethane dispersion liquid, more specifically relates to a kind of high solid content aqueous polyurethane dispersion liquid based on amino carboxylate and amino sulfonate at the same time. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Water-based polyurethane uses water as a solvent, and has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. With the enhancement of people's awareness of environmental protection and the increasing attention to environmental pollution in various countries, water-based polyurethane is gradually replacing solvent-based polyurethane and is widely used in many fields such as coati...

AI Technical Summary

Problems solved by technology

However, since the hydrophilic group of carboxylic acid-type water-based polyurethane is a weak acid and weak base salt, the hydrophilicity is poor, and it is difficult to prepare water-based polyurethane with high solid content.

The hydrophilic group of sulfonic acid type waterborne polyurethane is strong acid and strong alkali salt, which has high ionization strength and strong hydrophilicity, which is conducive to the preparation of high solid content waterborne polyurethane. However, the sulfonic acid type waterborne polyurethane prepared by many companies is The content is only about 40%, and the tensile strength is not high; many researchers have combined the advantages of carboxylic acid-based water-based polyurethane and sulfonic acid-based water-based polyurethane to prepare a polyurethane with high solid content and high tensile strength. Carboxylic acid / sulfonic acid mixed water-based polyurethane, but the stability of these water-based polyurethanes is not strong, and the tensile strength will be greatly reduced under sunlight

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