Stone back adhesive and preparation method thereof

Abstract

The invention discloses a stone back adhesive and a preparation method thereof, wherein the stone back adhesive comprises a material A and a material B, the material A comprises a prepolymer containing isocyanate groups, the material B comprises water and a functional auxiliary agent, and the material B does not comprise an amino compound. It can be understood that according to the technical scheme, the construction operation time of the adhesive can be prolonged, the adhesive is prevented from being partially cured in the spraying process, and thus the layering phenomenon in the spraying process is avoided, and the bonding firmness is guaranteed.

Description

technical field [0001] The invention relates to the technical field of stone adhesives, in particular to a stone adhesive and a preparation method thereof. Background technique [0002] Stone, especially marble, due to greater weathering, more micro-cracks, and low strength, needs to be reinforced with back mesh and adhesive. Among the currently used stone adhesives, epoxy adhesives have high bonding strength, but are not environmentally friendly, and the cost is high; unsaturated polyester adhesives have high bonding strength, low cost, and wide application, but they are also highly toxic and not environmentally friendly. ; However, the water-based cement-based adhesives that have appeared in recent years are environmentally friendly and low in cost, but their bonding strength is low and often cannot meet the requirements. Polyurea not only has many functions such as wear resistance, waterproof, impact resistance, fatigue resistance, aging resistance, high temperature resi...

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