Typical Formulation Ingredients
Phase
Ingredient
Parts by weight
A
SPUR 1015LM prepolymer (Momentive Performance Materials)
A
Moisture scavenger (Silquest A-171 silane)
A
Filler – calcium carbonate (fine)
A
Filler – calcium carbonate (course)
A
Thixotropic agent (SiO2)
A
Adhesion promoter (Silquest A-1110 silane)
A
Catalyst - dibutyl tin (Fomrez SUL-11A, Chemtura Corp.)
Resulting Properties
SPUR + prepolymer is a silylated polyurethane resin for manufacturing one-part, moisture-curing sealants and adhesives. Plasticizer-free and of relatively low viscosity, it is an excellent base resin for low modulus sealants in building and construction applications where good elastic recovery is required.
The properties are measured after curing for two weeks at 23°C and 60% RH. Key properties include:
- Excellent primerless adhesion to glass, aluminum and other metals
- Unusually good adhesion to plastics such as PVC, polystyrene, nylon, ABS, and acrylics, when an aminosilane such as Silquest A-1110 silane is utilized as an adhesion promoter in conjunction with the silylated resin
- Fast, bubble free cure
- Excellent durability and joint movement
- Good tensile strength and elasticity
- Freedom to formulate low modulus/high elongation or high modulus/low elongation systems
- Durable Si-O-Si crosslinks
- Excellent solvent resistance
- Immediate paintability
- Isocyanate-free urethane performance
A formulation by Momentive Performance Materials