Environment-friendly type polyurethane adhesive agent and preparation method thereof

Abstract

The invention discloses an environment-friendly polyurethane adhesive. The invention is characterized in that the adhesive is made from polyester polyol, isocyanate, monobasic alcohol, catalyst, and chain extender. The invention has a following formula: 20.5 percent to 27.5 percent of polyester polyol, 2.7 percent to 3.3 percent of isocyanate, 64.4 percent to 76.4 percent of monobasic alcohol, 0.09 percent to 0.11 percent of catalyst, and 0.3 percent to 0.55 percent of chain extender. The isocyanate can be HDI, MDI, IPDI, HMDI, TDI, and so on. At the same time, the invention discloses a preparation method of the adhesive: first the polyester polyol and the isocyanate react; then the chain extender is added; and the proportion of '- NCO-' group is kept excessive; when the reaction solution reaches a certain viscosity, the monobasic alcohol is added to dilute; after being mixed at a high speed, molecules are uniformly dispersed and the stable viscose liquid can be got. The invention has the advantages of environmental protection, effective use, and good stability, low cost and so on.

Description

technical field [0001] The invention relates to a polyurethane adhesive mainly used for shoemaking and the like and a preparation method thereof. Background technique [0002] Polyurethane Adhesive (Polyurethane Adhesive) refers to the adhesive containing carbamate group (-NHCOO-) or isocyanate group (-NCO) in the molecular chain. It has excellent performance. At present, polyurethane adhesives are widely used in industrial production. Traditional polyurethane adhesive resins are low in price, but they contain toluene, xylene, pure benzene and other benzene solvents that are harmful to human health, which are harmful to human body. , has pollution problems to the environment; when domestic adhesive manufacturers produce PU glue, they generally follow the national standard GB 19340-2003. The content of "toluene + xylene" in this kind of PU glue generally reaches 200g / kg; free toluene di The content of isocyanate has also reached 5-6g / kg; due to cost considerations, the amoun...

AI Technical Summary

Problems solved by technology

It has excellent performance. At present, polyurethane adhesives are widely used in industrial production. Traditional polyurethane adhesive resins are low in price, but contain benzene solvents such as toluene, xylene, and pure benzene, which are harmful to human health, and are harmful to human body. , has pollution problems to the environment; when domestic adhesive manufacturers produce PU glue, they generally follow the national standard GB 19340-2003. The content of "toluene + xylene" in this kind of PU glue generally reaches 200g / kg; free toluene di The content of isocyanate has also reached 5-6g / kg; due to cost considerations, the amount of raw materials or solid PU colloids added to the synthesis reaction is low, so that the content of "total volatile organic compounds" is generally controlled at 720-750 (g / L), just in line with the requirements of the national standard

But in the course of use, the performance effect is not ideal