Normal-temperature cured water-based polyurethane and preparation method and application thereof

Abstract

The invention discloses normal-temperature cured water-based polyurethane and a preparation method and application thereof. The polyurethane is prepared from polyether polyol, fluoride glycol, polyisocyanate, anti-mildew bactericide dimethyl fumarate, diluent, molecular weight modifier, fluorine-containing hydroxyl acrylate monomer, methacrylic acid-2-hydroxypropyl ester, chain extender, neutralizer and coupling agent. By means of the addition polymerization mode of unsaturated double bond containing polyether polyol, polyalkoxy silicon base and fluorine-containing hydroxyl acrylate are chemically bonded into polyurethane chains, novel water-soluble polyurethane resin of a polyalkoxy silicon base fluoro modified acrylic resin-polyurethane interpenetrating polymer networks (IPN) structure is synthesized and is made to have the common advantages of water-based polyurethane paint and polyacrylate emulsion, and the polyurethane is cured at normal temperature, has oil resistance and stain resistance, is suitable for waterproof and anti-foul coating on surface layers of leather, plastic, wood, metal, external walls and the like, and is environmentally friendly, high in industrial practicability and high in economic benefit.

Description

Technical field [0001] The invention relates to the field of preparation methods of waterborne polyurethane coatings, in particular to a preparation method and application of a normal temperature curing fluorine-containing hydroxy acrylate modified polyalkoxy silicon-based anionic and cationic waterborne polyurethane. Background technique [0002] The polymer chain of waterborne polyurethane can make the waterborne polyurethane resin have a variety of functions: water resistance, solvent resistance, abrasion resistance, scratch resistance, air permeability and hand feel are stronger than solvent-based polyurethane resin. Coatings containing water-soluble polyurethane resins are used in the waterproof and antifouling of leather products and plastic surfaces. Not only can the chemical properties meet the international environmental protection standards, but also the physical properties can greatly improve the coating performance. [0003] At present, in the preparation process of mos...

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Problems solved by technology

[0003] At present, in the preparation process of most polyurethane resins, the increase of the viscosity of the reaction system affects the polymerization stirring and the molecular weight of the polymer, so a certain amount of organic solvents such as acetone and butanone must be added for dilution. In the subsequent process, although it can be However, the process, equipment and cost will increase, and the recycling of organic solvents will also cause certain environmental pollution, and the environmental protection standards cannot meet the international environmental protection requirements.

Moreover, the traditional water-based polyurethane coatings containing the above polyurethane resins mostly have the disadvantages of high curing conditions, energy consumption, slow curing speed of the coating film, poor water resistance, and insufficient mechanical properties.

[0004] Chinese patent application number CN102618672A proposes a preparation method of a fluorine-containing leather protective agent. Although the treated leather has good waterproof, oil-proof and antifouling properties, its curing temperature is relatively high and cannot be cured at room temperature. Chinese patent "water-based polyurethane-acrylate resin for synthetic leather foaming material and preparation method thereof" proposes water-based polyurethane-acrylate resin and preparation method thereof for synthetic leather foaming material, although it has solvent-free, water-resistant Excellent performance and weather resistance, but its curing conditions are relatively harsh, requiring 60CO-γ irradiation curing, so its operation process is complicated and difficult to popularize; "National Key New Product of 2013" - Amway Co., Ltd. Although the new polyurethane material proposed by the "Leather" has good decontamination and anti-graffiti characteristics, the organic solvent contained in the antifouling material additive itself will have a certain negative impact on the environment, and the curing temperature is between 150°C and 180°C , energy consumption

The water-based fluorine-based waterproof, oil-proof and anti-fouling treatment agent of 3M in the United States is mainly used for the waterproof, oil-proof and anti-fouling finishing of textiles, nubuck leather and suede leather, and the water-based fluorine-based polyurethane silane coupling agent for the top coating of smooth leather Emulsion-type brightener, but has not been reported yet

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