Novel heat-resistant polyurethane hot melt adhesive for lamp industry and preparation method thereof

Abstract

The invention discloses a novel heat-resistant polyurethane hot melt adhesive for the lamp industry. The hot melt adhesive comprises the following components in percentage by weight: 20%-40% of polyester polyol, 20%-40% of polyether polyol, 10%-30% of tackifying resin, 0.2%-0.5% of an antioxidant, 0.01%-0.1% of a catalyst and 10%-30% of isocyanate. The invention also discloses a preparation methodof the novel heat-resistant polyurethane hot melt adhesive. The novel heat-resistant polyurethane hot melt adhesive prepared by reasonably compounding the polyester polyol, the polyether polyol, thetackifying resin, the antioxidant, the catalyst and the isocyanate has higher oxidation resistance, cohesiveness, heat resistance and tensile strength, is free of solvent volatile matters, environment-friendly and pollution-free, and improves the aesthetic problem of lamps in use. In addition, the preparation method is simple, raw materials and equipment are easy to obtain, and large-scale production can be realized.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a novel heat-resistant polyurethane hot-melt adhesive used in the lighting industry and a preparation method thereof. Background technique [0002] With the development and progress of science and technology, the LED photoelectric industry is also developing rapidly, and the annual output will double several times. In the past, in the LED industry, people usually used epoxy glue for component bonding, but due to the weak anti-ozone ability of epoxy glue, the colloid turned yellow, which affected the appearance. Later, it developed to use silica gel to bond parts. The advantage of silica gel is that the strip is transparent and resistant to high temperature, but silica gel takes a long time to dry, especially in winter. Manufacturers often have to wait for a few days, or even a week before proceeding to the next step. process, which greatly affects production efficiency. There...

AI Technical Summary

Problems solved by technology

In the past, in the LED industry, people usually used epoxy glue for component bonding, but due to the weak anti-ozone ability of epoxy glue, the colloid turned yellow, which affected the appearance

Later, it developed to use silica gel to bond parts. The advantage of silica gel is that the strip is transparent and resistant to high temperature, but silica gel takes a long time to dry, especially in winter. Manufacturers often have to wait for a few days, or even a week before proceeding to the next step. process, which greatly affects production efficiency

Therefore, more and more customers tend to use one-component moisture-curing polyurethane adhesives for component bonding. The one-component moisture-curing polyurethane adhesives have a short opening time and can quickly dry the surface before proceeding to the next process. Moreover, the bonding strength can be achieved on the second day of sizing, which greatly improves the production efficiency. However, the heat resistance of the single-component moisture-curing polyurethane adhesive on the market is poor.

Images