Self-extinction waterborne polyurethane coating and preparation method thereof

Abstract

The invention provides a self-extinction waterborne polyurethane coating and a preparation method thereof, belonging to the field of aqueous coatings. The coating comprises a component A and a component B. The component A comprises the following components in parts by weight: 30 to 40 parts of organic silicon modified waterborne polyurethane, 10 to 20 parts of water-based hydroxyl acrylate dispersoid, 12 to 18 parts of modified silicon dioxide extinction powder, 5 to 10 parts of lignin, 2 to 5 parts of light calcium carbonate, 1 to 3 parts of halloysite, 1 to 3 parts of sericite, 4 to 8 partsof polyamide wax slurry, 0.5 to 1 part of an MA-SAS-BA copolymer dispersing agent, 0.1 to 0.2 part of triethanolamine, 0.1 to 1 part of lauryl sodium sulfate, 1 to 1.5 parts of sodium monododecyl phosphate, 2 to 6 parts of a water-based defoamer BYK024, 4 to 8 parts of a water-based leveling agent BKY346, 5 to 10 parts of propylene glycol monomethyl ether, 0.1 to 1 part of a nonionic polyurethaneassociative thickener, 10 to 20 parts of propylene glycol methyl ether acetate and 60 to 80 parts of water. The component B is a curing agent WT-2102. The self-extinction waterborne polyurethane coating disclosed by the invention is stable in property; and a film formed by the coating is stable in property and resistant to acid, alkali and solvent corrosion, and has strength, toughness and hardness meeting national standards.

Description

technical field [0001] The invention relates to the field of water-based paints, in particular to a self-dulling water-based polyurethane paint and a preparation method thereof. Background technique [0002] In the coating industry, polyurethane is the most used and most promising type of polymer family. Polyurethane is a high-performance polymer material with oligomeric polyol as the soft segment and isocyanate and chain extender as the hard segment. The block compound of segment, its chemical structure contains various polar bonds such as carbamate, ether bond, urea bond and allophanate bond, these polar bonds endow it with superior bonding performance and film forming Performance, so that it has many properties such as abrasion resistance, chemical corrosion resistance, low temperature resistance, good flexibility and strong adhesion. Its elastomers, foam plastics, coatings and adhesives have been widely used. [0003] At present, polyurethane coatings are mainly solvent...

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Problems solved by technology

[0004] Water-based polyurethane coatings combine the high performance of solvent-based polyurethane coatings with the low VOC content of water-based coatings. Using water as the medium, it has many advantages such as non-combustibility, no pollution to the environment, high hardness of the coating film, abrasion resistance, energy saving and easy processing. , and its molecular structure can be cut, combined with new synthesis and cross-linking technology, the performance of water-based polyurethane coatings can reach or even exceed that of traditional solvent-based coatings, and it has become one of the fastest-growing coating varieties, while self-dulling water-based polyurethane Coatings are new members of water-based polyurethane coatings. The common matting agent is silica, which is evenly distributed in the paint film to form a micro-rough surface. From the scanning electron microscope photo of the coating film section, it can be clearly seen that the matting agent II Silicon oxide particles are evenly distributed in the coating film. When the incident light reaches the uneven surface of the paint film, diffuse reflection occurs, that is, scattering occurs to produce a low-gloss matte and matte appearance. However, after adding the matting agent silica, It is easy to cause precipitation, which will reduce the stability of the system, and the storage time is not long

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