Thermosensitive high-performance polyurethane adhesive convenient for construction

Abstract

The invention discloses a thermosensitive high-performance polyurethane adhesive convenient for construction. The thermosensitive high-performance polyurethane adhesive comprises a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 40 to 60 parts of polyol resin, 0.2 to 0.8 part of a diazabicyclo compound, 0.2 to 0.8 part of a compound containing hydroxyl and/or carboxyl, 40 to 50 parts of a filler, 1 to 3 parts of a lubricant and 0.5 to 2 parts of a coupling agent; and the component B is isocyanate of which the isocyanate functionality is greater than or equal to 2. The obtained polyurethane adhesive shows good mechanical properties and bonding strength, the active period and the opening time of the adhesive can be remarkably prolonged, the process error-tolerant rate is high, the gun head blockage condition does not occur after shutdown, and continuous production can be achieved; and meanwhile, the surface is smooth and free of air holes through naked eye observation after gluing is conducted for 1 min. Besides, the polyurethane adhesive is good in leveling time and curing time matching, good in leveling property and ductility, capable of being used for spraying, curtain coating and other processes besides the traditional use mode of the adhesive, and extremely high in actual popularization significance.

Description

technical field [0001] The invention relates to the field of polyurethane adhesives, in particular to a heat-sensitive high-performance polyurethane adhesive that is convenient for construction. Background technique [0002] Polyurethane spray glue is a kind of glue that can be sprayed by machine. It is cured by hot pressing to ensure fast board release. It is suitable for customer groups with tight order delivery and large output. The application of polyurethane gluing can save the space of the industrial site and reduce manual operation, so as to avoid the frequent mistakes of personnel operation, uneven gluing amount, resulting in glue opening and bulging, etc., and ensure the stable quality of the final finished board. [0003] At present, traditional polyurethane adhesives on the market usually add catalysts such as N,N-dimethylcyclohexylamine and triethylamine to improve the bonding strength of the colloids, but the problem is that after the colloids are mixed, the cro...

AI Technical Summary

Problems solved by technology

[0003] At present, traditional polyurethane adhesives on the market usually add catalysts such as N,N-dimethylcyclohexylamine and triethylamine to improve the bonding strength of the colloids, but the problem is that after the colloids are mixed, the crosslinking reaction rate is too fast and the activity The period is short, the opening time is short, and the process error tolerance rate is low; continuous and uninterrupted production is required. Once the spraying process stops, the spraying glue can easily block the gun head

Therefore, it is necessary to manually clean the gun head frequently, which not only wastes glue and cleaning agent, but also increases waste disposal costs and labor costs

In addition, the existing polyurethane glue also has the problems of poor mechanical properties and bonding strength, and the quality of the board cannot be effectively guaranteed in the actual use process; and the mismatch between the leveling time and the curing time leads to poor leveling, and after curing There are often wrinkles or pores on the surface of the glue, which affects the further use of the product