A kind of reactive polyurethane hot melt adhesive and preparation method thereof

Abstract

The invention discloses a reactive polyurethane hot-melt adhesive, which is composed of the following raw materials in parts by weight: 30-60 parts of polyether polyol, 20-40 parts of polyester polyol, 10-20 parts of polyisocyanate, hydroxyl-terminated acrylate ‑Carbonate copolymer resin 0.5-20 parts, water resistance enhancing additive 0.5-4 parts, catalyst 0.05-0.5 parts. The invention also provides a preparation method of the reactive polyurethane hot-melt adhesive. The reactive polyurethane hot-melt adhesive prepared by the present invention has excellent adhesion to plastics, metals, wood, glass, etc., and has good adhesion to low surface energy materials such as PP and PE, and has good heat resistance. The resistance to water or moisture is particularly superior, and it can be used in fields that require good adhesion to low surface energy materials and may be exposed to heat, water or moisture for a long time. It is suitable for automobile manufacturing, woodworking appliances, construction engineering, Electronic appliances and other fields have broad market prospects.

Description

technical field [0001] The invention belongs to the technical field of reactive polyurethane hot-melt adhesives, in particular, the invention relates to a reactive polyurethane hot-melt adhesive capable of high-strength bonding and water immersion resistance to low-surface-energy plastics and a preparation method thereof. Background technique [0002] Reactive polyurethane hot melt adhesive (PUR) is a reactive adhesive with excellent initial bonding strength, fast fixation, cross-linking and curing, and also has the characteristics of heat resistance, durability, and high final bonding strength. It is developing rapidly and is widely used in construction. , machinery, automobile, electronics and other industries have extremely high application value. [0003] How to improve the bonding of low surface energy plastics in complex environments is a major problem faced by PUR. These environments include: moisture environment, water immersion, long-term external light source expos...

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Problems solved by technology

[0009] It can be seen from the above inventions that it is still difficult to obtain PUR that can guarantee good bonding performance in the environment of water immersion, high humidity and high temperature shock in the market.

For example, after soaking in water and being subjected to high temperature and humidity, it is generally difficult to maintain the bond strength retention rate to 70%. After curing, the water permeability is too strong, and it is especially prone to problems when used in hot and humid environments.

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