Reactive polyurethane hot melt adhesive and preparation method thereof

Abstract

The invention relates to a reactive polyurethane hot melt adhesive and a preparation method thereof. The reactive polyurethane hot melt adhesive comprises the following raw materials in parts by weight: 30 to 50 parts of crystalline polyester polyol, 30 to 50 parts of liquid polyester polyol, 10 to 20 parts of phosphorus-containing polyol, 10 to 50 parts of isocyanate, 10 to 30 parts of thermoplastic resin, 1 to 3 parts of adhesion promoter, 0.1 to 0.5 part of catalyst and 1 to 2 parts of antioxidant. The reactive polyurethane hot melt adhesive has the advantages of excellent flame retardancyand adhesion, and has the advantages of fast curing speed, high final bonding strength, good environmental resistance, low atomization value and the like, and is particularly suitable for the field ofhigh flame-retardant requirements, thereby having good market prospect. Besides, the reactive polyurethane hot melt adhesive is an one-component moisture-curing polyurethane adhesive, belongs to thesolvent-free environment-friendly adhesive agent industry, and can be used for bonding substrates such as plastic, glass, metal, textile and the like.

Description

technical field [0001] The invention relates to hot-melt adhesives, in particular to reactive polyurethane hot-melt adhesives and a preparation method thereof. Background technique [0002] Reactive polyurethane hot melt adhesive (PUR) has been rapidly developed in industries such as automobiles, electronic appliances, wood processing, bookbinding and food packaging in recent years because of its simple operation, excellent performance, and environmental friendliness. However, the existing PUR has poor flame retardancy, which limits its application in some specific fields. [0003] Usually, flame retardant polymers are prepared by adding flame retardants. Flame retardants are divided into inorganic flame retardants and organic flame retardants. If PUR is to achieve a better flame retardant effect, the amount of inorganic flame retardants added Larger, which will lead to a significant increase in the melt viscosity of PUR and poor workability; while adding an organic flame r...

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Problems solved by technology

However, the existing PUR flame retardancy is relatively poor, which limits its application in some specific fields

[0003] Usually, flame retardant polymers are prepared by adding flame retardants. Flame retardants are divided into inorganic flame retardants and organic flame retardants. If PUR is to achieve a better flame retardant effect, the amount of inorganic flame retardants added Larger, which will lead to a significant increase in the melt viscosity of PUR and poor workability; while adding an organic flame retardant, there may be poor compatibility between the flame retardant and the PUR system, and the flame retardant is easy to precipitate, making the bonding of PUR Poor performance, increased VOC content

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