Moisture-curable polyurethane hot melt adhesive as well as preparation method and application thereof

Abstract

The invention provides a moisture-curable polyurethane hot melt adhesive as well as a preparation method and application thereof. The moisture-curable polyurethane hot melt adhesive is prepared from the following raw material components in parts by weight: 500 to 800 parts by weight of polyether polyol, 30 to 200 parts by weight of a chain extender, 200 to 300 parts by weight of polyisocyanate, 3to 8 parts by weight of a monofunctional end-capping reagent and 0.1 to 0.6 part by weight of a catalyst, the monofunctional end-capping reagent can block part of NCO groups in a system, so that the hot melt adhesive still keeps certain viscosity after being cured and converted into a solid state, and can be stably bonded with nylon taffeta, thereby avoiding infirm bonding caused by volume changein the curing process of a polyurethane system and improving the curing effect of the polyurethane system. The bonding strength and the bonding stability are obviously improved. The moisture-curable polyurethane hot melt adhesive has proper viscosity and initial bonding strength and relatively high final bonding strength and bonding stability, and can fully meet the requirement for compounding nylon taffeta fabrics.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a moisture-curing polyurethane hot-melt adhesive and a preparation method and application thereof. Background technique [0002] As one of the most widely used raw materials in the textile industry, adhesives play an irreplaceable role in the production, processing and application of textiles. In terms of their chemical composition, textile adhesives include polymers such as polyurethane, acrylic polymers, polyethylene, and polyvinyl alcohol. In the production process of nylon fabric (nylon fabric), traditional solvent-based adhesives have a significant effect on nylon fabric compounding, but solvent-based adhesives will emit a large amount of organic volatile gases during use, which not only causes It not only wastes resources, but also brings environmental pollution that cannot be ignored. As the country attaches great importance to environmental protection in r...

AI Technical Summary

Problems solved by technology

CN109609074A discloses a preparation method of a one-component moisture-curing polyurethane hot-melt adhesive. The specific steps include: mixing polyether polyol, polyester polyol, tackifier and antioxidant, vacuum dehydration, and then adding isocyanate and catalyst react, then add chain extender and filler in turn, and react to obtain hot melt adhesive; wherein, the tackifier is a copolyamide hot melt adhesive resin, which can be specially modified to the traditional one-component moisture-curing polyurethane hot melt adhesive system properties, making the bonding of hot melt adhesives to nylon fabrics more targeted; however, copolyamides have a high melting point and poor compatibility with polyurethane, making it difficult to obtain a uniform and stable system, and the viscosity of the obtained hot melt adhesives is 5000 ~6500mPa s / 120℃, while the viscosity of the hot melt adhesive used for laminating fabrics and polymer films is 1000~3000mPa s / 120℃, the viscosity of the hot melt adhesive is too high, which limits its application range

CN1261519C discloses a kind of polyurethane adhesive that is used for nylon film compounding, described polyurethane adhesive is by main agent and curing agent with mass ratio 100:(10~20); Described main agent comprises polyurethane prepolymer, polyamide and organic solvent, and the curing agent is an adduct of polyisocyanate and polyol; the polyurethane adhesive can improve the peel strength and flexibility of the nylon composite film, but its essence is a solvent-based adhesive, which cannot adapt to the current development of the textile industry need

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