Nonionic aqueous polyurethane emulsion and preparation method thereof

Abstract

The invention discloses a nonionic aqueous polyurethane emulsion and a preparation method thereof, belonging to the technical field of high-molecular materials. The nonionic aqueous polyurethane emulsion comprises polyether polyol or polyester polyol, isocyanate, micromolecular chain extender, nonionic hydrophilic chain extender, hydrophilic chain extender, 0.6-1 weight portions of cross-linking agent, lower boiling point solvent, catalyst, amine neutralizer, amine chain extender, 0.4-2 weight portions of aqueous wetting agent, and aqueous levelling agent. The preparation method is characterized in that: prepolymerization, polymerization, emulsification, distillation, compounding are carried out to prepare the nonionic aqueous polyurethane emulsion, then the aqueous wetting agent and aqueous levelling agent are added with stirring to obtain an aqueous nonionic polyurethane glass fibre impregnating compound. The prepared nonionic aqueous polyurethane emulsion disclosed herein has the advantages of good stability, long stable phase, wide application scope, high strength, wear resistance, good elasticity, yellow stain resistance, aging resistance, solvent resistance, low temperature resistance, tortuosity resistance, good penetration, compatibility, good interface chemical combination or chemisorption and other excellent performances.

Description

technical field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of water-based polyurethane emulsion. Background technique

[0002] In the production of glass fiber, sizing agent is an indispensable auxiliary agent. The film-forming agent used in the early stage is mainly composed of starch and paraffin. Although they can endow the glass fiber with better bundling properties, they are compatible with the reinforced material. Poor performance, the sizing agent needs to be removed before being used in composite materials. With the development of the chemical industry, more and more synthetic resins are used as film-forming agents, mainly: polyvinyl acetate resin, polyester resin, epoxy resin, acrylic resin , polyurethane resin, etc. Polyurethane emulsion has become the fastest-growing new type of film-forming agent among sizing film-forming agents due to its excellent performance. At present, the only...

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