High solid content nanometer polyurethane adhesive and preparation method therefor

Abstract

The invention discloses a high solid content nanometer polyurethane adhesive and a preparation method therefor. The high solid content nanometer polyurethane adhesive comprises the following components in parts by weight: 30-40 parts of polyoxypropylene triol , 10-15 parts of polyethylene adipate glycol esterdiol, 5-8 parts of toluene diisocynate, 3-6 parts of dibutyl phthalate, 1.2-1.8 parts of 2,2-dimethylolpropionic acid, 5-8 parts of polyaniline, 3-6 parts of silicon carbide, 1-2.3 parts of ethylene glycol monomethy1 acetate , 2-4 parts of 2,4-sodium diaminophenylsulfonate, 10-20 parts of N-methyl pyrrolidone, 1.3-1.7 parts of lysine-di-isocyanate, 1-4 parts of polyamine, 2-6 parts of sodium alkyl benzene sulfonate, 1-2 parts of sodium dodecyl benzene sulfonate and 20-40 parts of water. The adhesive is high in solid content and high in adhesive strength, and can be quickly cured, the curing time is also greatly shortened, the surface is smooth and free of crack after being dried, and the preparation method is simple and easy in operation.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a high-solid-content nano polyurethane adhesive and a preparation method thereof. Background technique [0002] Polyurethane (PU) adhesives have the advantages of adjustable softness and hardness, excellent low temperature resistance, good flexibility and high bonding strength, excellent mechanical properties, simple bonding process, low temperature resistance, and high temperature performance. wider. The organic solvents in solvent-based polyurethane adhesives have disadvantages such as strong odor, volatile, polluting the environment and being flammable when used. Drug companies, merchants and developers of all ages. Water-based polyurethane uses water as a dispersant, so it has the advantages of economy, safety (non-flammable and non-explosive), non-toxic, non-polluting, low odor, and easy to clean residue after use. However, water-based polyurethane adhes...

AI Technical Summary

Problems solved by technology

Water-based polyurethane uses water as a dispersant, so it has the advantages of economy, safety (non-flammable and non-explosive), non-toxic, non-polluting, low odor, and easy to clean residue after use. However, water-based polyurethane adhesives must completely replace solvent-based polyurethane adhesives. To be further improved its performance

In particular, it is necessary to better overcome its own shortcomings: such as slow drying, poor surface wettability to some materials, because it contains hydrophilic components, and sometimes contains water-based additives, so that the water resistance of the film is not good. , prone to foaming due to the presence of internal / external surfactants, etc.

And if most of the moisture in the adhesive has not had time to evaporate from the adhesive layer and coating to the air during the heating and drying process after sizing, it is easy to get a discontinuous adhesive layer, which affects the bonding effect.

Low solid matter content indicates that there is more moisture in the adhesive. During the application and construction of the adhesive, it will inevitably require higher heat energy consumption to volatilize the moisture, and the cost will naturally increase.

At the same time, products with low solid content also have the disadvantages of high unit production energy consumption, high transportation and packaging costs