A kind of stone adhesive and preparation method thereof

Abstract

The invention discloses a stone back glue and a preparation method thereof, wherein the stone back glue includes a material and a material B, the material A includes a prepolymer containing isocyanate groups, and the material B includes water and a functional auxiliary agent, and the second material does not include amino compounds. It can be understood that the technical solution of the present invention can prolong the construction operation time of the adhesive, prevent the adhesive from partially curing during the spraying process, thereby avoiding the generation of delamination during the spraying process and ensuring the firmness of the bond.

Description

technical field [0001] The invention relates to the technical field of stone adhesives, in particular to a stone back glue and a preparation method thereof. Background technique [0002] Stone, especially marble, needs to be strengthened with back mesh and back glue due to its large weathering, many micro-cracks and low strength. Among the currently used stone adhesives, epoxy adhesives have high bonding strength, but are not environmentally friendly and have high costs; unsaturated polyester adhesives have higher adhesive strength, lower costs, and are widely used, but are also highly toxic and not environmentally friendly. ; And the water-based cement-based adhesives that have appeared in recent years, although green and environmental protection, low cost, but low bonding strength, often can not meet the requirements. Polyurea not only has many functions such as wear resistance, waterproof, impact resistance, fatigue resistance, aging resistance, high temperature resistan...

AI Technical Summary

Problems solved by technology

However, it has not been used for stone adhesives. The disadvantage of polyurea is that the reaction speed is too fast. The existing polyurea adhesives include material A and material B. Material A is a prepolymer formed by the reaction of polyether polyol and isocyanate, and material B includes amino Compounds and functional additives, by mixing material A and material B, the prepolymer reacts with the amino compound to complete the curing of the adhesive, achieving the effect of fixing the back net on the back of the stone product

However, because the reaction speed of the prepolymer and the amino compound is very fast, it only takes a few minutes to complete the reaction after mixing. The adhesives sprayed before and after can not be blended, resulting in adhesive layering, causing the problem of weak bonding