Modified low-melting-point polyester hot melt adhesive, and preparation method thereof

Abstract

The invention belongs to the technical field of polyester adhesive, and specifically relates to a modified low-melting-point polyester hot melt adhesive, and a preparation method thereof. The modified low-melting-point polyester hot melt adhesive comprises, by weight, 88 to 94% of a polyester dihydric alcohol, 2 to 4% of polyether phosphate ester, and 5 to 9% of hyperbranched polyester; wherein the polyester dihydric alcohol is a condensation polymerization product of a dicarboxylic acid with a C2-6 dihydric alcohol, the dicarboxylic acid comprises terephthalic acid, m-phthalic acid, and unnecessary C6-12 aliphatic dicarboxylic acid units, and weight-average molecular weight ranges from 26000 to 37000. According to the preparation method, polyether phosphate ester is used for chemical modification of the polyester dihydric alcohol, and an appropriate amount of hyperbranched polyester is added, so that the obtained modified low-melting-point polyester hot melt adhesive possesses relatively low melt viscosity, relatively high weight-average molecular weight, and excellent physical properties and bonding strength.

Description

[0001] technical field [0002] The patent of the present invention relates to the technical field of polyester adhesives, in particular to a modified low-melting point polyester hot-melt adhesive and a preparation method thereof. technical background [0003] With the development of my country's shoemaking industry and the continuous improvement of environmental protection requirements, superior performance, non-toxic and environmentally friendly hot melt adhesives have replaced traditional solvent-based adhesives. Many large and medium-sized shoe-making enterprises in my country already have many imported and domestic advanced shoe-making equipment, and the production efficiency has been greatly improved. They also put forward higher requirements for various technical characteristics of hot-melt adhesives. It is necessary to ensure the bonding strength of shoes, It is also necessary to ensure the high temperature resistance, low temperature resistance, bending elasticity an...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN1990810A introduces a raw material used in polyester hot-melt adhesive and its processing technology, which can obtain polyester hot-melt adhesive with a weight average molecular weight of 20000-35000, but the polyester hot-melt adhesive synthesized by this formula system Viscosity above 18000cps, cannot adapt to some shoe-making processes that require low viscosity

Of course, the viscosity of the adhesive can usually be achieved by controlling the molecular weight. Low molecular weight can obtain low viscosity, but low molecular weight often leads to poor material performance, poor adhesion and loss of use value. Therefore, we need to continue in production practice. Explore, looking for a polyester hot melt adhesive with high molecular weight and low viscosity