Water-based polypropylene carbonate polyurethane emulsion and preparation method thereof

Abstract

The invention provides a water-based polypropylene carbonate polyurethane emulsion which is prepared from the following components in parts by weight: 100 parts of polypropylene carbonate polylol containing unsaturated double bond on the side chain, 3-10 parts of hydrophilic chain extender, 0.1-10 parts of polymerization inhibitor, 20-100 parts of polyisocyanate, 1-10 parts of chain extension crosslinking agent, 2-10 parts of salifying agent and 100-300 parts of deionized water. The invention also provides a preparation method of the water-based polypropylene carbonate polyurethane emulsion. The side chain of the water-based polypropylene carbonate polyurethane emulsion contains the unsaturated double bond, so that the water-based polypropylene carbonate polyurethane emulsion can be further crosslinked to obtain the crosslinked polyurethane product with higher hardness, higher strength and favorable solvent resistance.

Description

technical field [0001] The invention relates to a water-based polyurethane emulsion, in particular to a water-based polypropylene carbonate type polyurethane emulsion and a preparation method thereof. Background technique [0002] Waterborne polyurethane is a new material that can be used in adhesives, coatings, paints, inks and other fields. Traditional solvent-based polyurethane uses a large amount of solvents, such as toluene, benzene, methyl ethyl ketone, xylene, chlorinated alkanes, etc. These solvents are not only flammable, explosive, and volatile, but also have a strong smell, which will cause serious air pollution when used , causing potential harm to the human body. In recent years, with the enhancement of public awareness of environmental protection, the requirements for environmental protection of materials are getting higher and higher. Since water-based polyurethane uses water instead of organic solvents as the dispersion medium, it has low VOC content, low od...

AI Technical Summary

Problems solved by technology

[0003] Since polyester polyols are prone to hydrolysis, water-based polyurethanes are basically polyether polyols. Polyether-type water-based polyurethanes have good low-temperature flexibility and resistance to hydrolysis, but the strength of the polyurethane film after film formation is low and resistant Poor scratch resistance, poor adhesion, limited application places

Although polytetrahydrofuran and polyhexamethylene carbonate diol can be used to obtain water-based polyurethane with high bonding strength, excellent abrasion resistance and scratch resistance, the product cost is relatively high, which is not conducive to large-scale industrial production, which limits the use and to promote

[0004] In polyurethane products, the hardness, strength, and solvent resistance of crosslinked polyurethane are higher than those of linear polyurethane with similar formulations, and with the increase of crosslinking density, the hardness, strength, and solvent resistance of the product are improved accordingly, while At present, polyether, polyester, and polycarbonate polyols commonly used in the preparation of polyurethane materials are mostly linear products, so the prepared polyurethane materials generally have the problems of low hardness, low strength and poor solvent resistance after curing.