Polyurethane sealant is featured with high strength, tear resistance, softness and wear resistance, puncture resistance, oil resistance, medium corrosion resistance, etc. The disadvantage is that the curing speed is slow and the surface is easy to stick, and it cannot be resistant to heat and humidity for a long time and aging resistance. The long-term storage stability is not great. Silicone sealants are poor in decorative properties, incapable of being painted, low in breaking strength, and are not resistant to puncture.
We are looking for companies with knowledge of the following requirements:
It is necessary to develop an efficient silane-modified polyether adhesive, which can effectively combine the advantages of silicone sealant and polyurethane sealant, and at the same time overcome the performance loss caused by their shortcomings to a large extent.
The viscosity and performance of the synthesized silane-modified resin should be stable, and the shelf life should be up to 1 year;
It can realize primer-free bonding of the concrete base surface, and the adhesive force should reach more than 0.5MPA;
Conventional properties: tensile strength should be within 0.8-1.0 MPa, elongation at break more than 4000%, resilience more than 70%, and 60% modulus: 0.3-0.35MPa;
Construction applicability: excellent extrusion performance, sag (50℃, 4h, 0mm), and aluminum plate well-bonding (can be used for steel roof repairs).