Water-resistant high-temperature-resistant single-component waterborne polyurethane adhesive and preparation method thereof

Abstract

The invention discloses a water-resistant high-temperature-resistant single-component waterborne polyurethane adhesive and a preparation method thereof and relates to the technical field of polyurethane adhesives. The adhesive comprises, by weight, 30-40 parts of polytetrahydrofuran glycol, 15-22 parts of polycarbonate diol, 3-7 parts of poly-2,6-polyethylene naphthalate polyester glycol, 17-25 parts of diisocyanate, 2-5 parts of chain extender, 0.5-2 parts of silane coupling agent modified silicon dioxide nanoparticles, 0.1-0.6 part of dibutyltin dilaurate, 4-8 parts of acetone, 1-3 parts oftriethylamine, 0.05-0.1 part of sodium hydroxide and an appropriate amount of water. Polytetrahydrofuran and polycarbonate diol are adopted as oligomer polyhydric alcohols in raw materials for preparing polyurethane, and added poly-2,6-polyethylene naphthalate polyester glycol is introduced to a soft-segment part of polyurethane; by adding silane coupling agent modified silicon dioxide nanoparticles, the mechanical properties and heat resistance of the adhesive can be improved; the prepared adhesive is high in adhesive force and excellent in water resistance and high temperature resistance, and the application range of the adhesive is enlarged.

Description

technical field [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a water-resistant and high-temperature resistant one-component water-based polyurethane adhesive and a preparation method thereof. Background technique [0002] Adhesive refers to a class of organic or inorganic, natural or synthetic substances that can connect the same or two or more homogeneous or heterogeneous parts or materials together, and have sufficient strength after curing. Among them, the polyurethane adhesive refers to an adhesive containing a carbamate group (-NHCOO-) or an isocyanate group (-NCO) in the molecular chain. , rubber, fiber, plastic, wood, ceramics, glass, paper, leather and other materials have good adhesion, and the application industry is extremely wide, which has a major impact on the progress of high-tech and the improvement of people's daily life. However, due to the general high temperature resistance and water resistance of polyur...

AI Technical Summary

Problems solved by technology

However, due to the general high temperature resistance and water resistance of polyurethane adhesives, in some special bonding environments, the active groups in the macromolecules will be destroyed due to high temperature or chemical reactions such as hydrolysis and oxidation with active medium molecules. , cracking, resulting in a decrease in bonding strength, problems such as acid and alkali resistance or water resistance, which limit the scope of application

The above defects limit the industrial application of polyurethane adhesives, affect the excellent performance of polyurethane adhesives, and limit the further development of polyurethane adhesives