DIMONDS® MS250 Silane Modified Polyether MS Polymer
Description
DIMONDS® MS250 is a silane modified polyurethane resin based on high molecular weight polyether, end-capped with siloxane and containing carbamate groups, has the characteristics of high activity, no dissociative isocyanate, no solvent, excellent adhesion and so on.
Curing Mechanism
DIMONDS® MS250 curing mechanism is moisture curing. Catalysts are needed in sealant formulation. Ordinary organotin catalysts (such as dibutyltin dilaurate) or chelated tin (such as diacetylacetone dibutyltin) can achieve good mechanical properties. The recommended amount of tin catalysts is 0.1-0.6%.
Specifications
| Items | Specification | Test Method | Executive Standard |
| Appearance | Colorless to pale yellowish, transparent, viscous liquid | By Visual | – |
| Color Value | 50 Max | APHA | GB/T 3143-1982 |
| Viscosity (mPa·s) | 40,000-70,000 | 25℃ tested by Brookfield Viscosity Meter | GB/T 12008.7-2010 |
| PH Value | 7.0-8.0 | Isopropyl Alcohol/Water Solution | GB/T 12008.2-2010 |
| Water Content (wt%) | 0.1 Max | Karl Fischer | GB/T 22313-2008 |
| Gravity | 1.01-1.03 | 25℃ water at 1.0 | GB/T 13354-1992 |
| Tack Free Time
(1% chelating tin), min |
30 Max | Surface touch with fingers | GB/T 13477.5-2002B |
Application Method
DIMONDS® MS250 combined with plasticizer, nano calcium carbonate, silane coupling agent and other fillers and additives can prepare sealant products which has tensile strength of 1.0-4.0 MPa, 100% modulus between 0.2-3.0MPa. Donseal 920R can also be used to produce transparent sealants which are widely used for building exterior wall, home decoration, industrial elastic sealant, elastic adhesive and so on.
