Wet curing polyurethane hot melt adhesive for plate material edge sealing

Abstract

The invention discloses a wet curing polyurethane hot melt adhesive for plate material edge sealing. The wet curing polyurethane hot melt adhesive comprises ingredients such as liquid polyester polyol, solid polyester polyol, isocyanate, thermoplastic resin and tackifying resin. The adhesive has the advantages that the compatibility among all ingredients is good; the positioning is fast; the high initial bonding intensity and final bonding intensity are realized, and the like. The wet curing polyurethane hot melt adhesive is particularly applicable to plate material edge sealing.

Description

Technical field [0001] The invention relates to a sheet edge sealing agent, in particular to a moisture curing polyurethane hot melt adhesive, and belongs to the technical field of adhesives. Background technique [0002] In order to make full use of wood resources, the furniture and building materials industries are increasingly using recycled products from wood processing leftovers-laminates, high-density boards, low-density boards, particleboards and so on. In the past, white latex, universal glue or EVA hot melt glue was used to seal the corners of furniture and decorative components made of these plates. However, these adhesives more or less contain free formaldehyde or organic solvents that damage the atmosphere. The curing is achieved by chemical reactions or volatilization of solvents. Therefore, it takes a certain amount of time from sizing to relative positioning of the adhered parts. , Limiting the efficiency and automation of the glue process. [0003] Moisture-curing...

AI Technical Summary

Problems solved by technology

But its problem is that it has small wet strength in its open state. After applying the adhesive, the joint workpiece may need external mechanical support until the adhesive cures into a strong elastic cross-linked adhesive layer, and the formation of a strong bond requires A curing time, ranging from a few hours to many days

However, its peel strength is low and the opening time is long, which limits the working efficiency and automatic production of the glue process.

In 2014, the Chinese patent (CN 104449535 A) disclosed a method for preparing a silane-modified moisture-curing polyurethane hot-melt adhesive, using polyether polyol, polyester polyol, tackifying resin, antioxidant, fluorescent whitening agent, etc. The raw material is obtained by reaction, prepolymerization with isocyanate, and coupling with chain extender and coupling agent. The moisture curing polyurethane hot melt adhesive is mainly modified for water resistance, but its peel strength is low

The 2016 Chinese patent (CN 106221648A) discloses a moisture-curing polyurethane hot-melt adhesive for rapid assembly; its key component polyurethane prepolymer includes a prepolymerized reaction product of a polyol component and an isocyanate component, and the polyhydric The alcohol component includes crystalline polyester polyol, liquid polyester polyol, thermoplastic polyurethane polymer, and thermoplastic resin with Tg not lower than 50°C. The moisture-curing polyurethane hot-melt adhesive has high initial strength, accelerates cooling and positioning, and is suitable for Fast assembly on the assembly line, but its ultimate strength is not clear

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