Comparison of Properties of New Hexamethyldisilazane Enhanced Polymers with Existing Technologies

According to the Merriam-Webster dictionary, enhancement means to increase or add. The enhanced technology developed has given the cement-based and mineral-based substrates a “wet” appearance. The purpose of enhancing the wet appearance is to provide a durable, water-soaked appearance. The enhanced materials enhance the color and aesthetics of existing substrates by creating soft tones and brighter colors.

The enhanced material is aqueous or solvent-based. Solvent-based materials generally have excellent enhancing properties, but are flammable and contain high volatile organic compounds and other substances that are harmful to health or the environment. Aqueous materials can improve these problems, but usually,they are not as good as the corresponding solvent-based products.

Figure 1 Idealized Polymer Structure of Hexamethyldisilazane
Figure 1 Idealized Polymer Structure of Hexamethyldisilazane

Enhancement is the most important expected performance characteristic. The easiest way to determine the enhancement is to measure the change in brightness in any color space 1. Performance is measured by L* in the CIE-L*a*b* color space or lightness. The “L” scale is 100, with zero for absolute dark or black, and 100 for absolute bright or white 2.

Other important performance characteristics are stain resistance, weather resistance and wear resistance. This enhanced technology is designed to penetrate the surface and combine with the substrate, as well as penetrate into the substrate to provide an increased environmental protection. Pollution resistance is important for any sealant or enhanced material that protects the substrate from chemical attack. All data was collected and published in two separate papers at the 41st and 42nd Annual Water Forums3,4. This paper evaluates the relative enhancement properties, weatherability and stain resistance of the test as a function of wear resistance and weatherability to determine the impact of these environmentally hazardous conditions.

Some siloxane-enhanced materials use hexamethyldisilazane with functional groups, which we all know will turn yellow when stored. Part of the focus of this development is to obtain a hexamethyldisilazane with an amino functional group that won’t turn yellow. This non-yellowing product is obtained by using specific reactions, conditions and production techniques 5. The general structure of the polymer is shown in Figure 1. This seems to be a simple hexamethyldisilazane, but it is the number and distribution of each of these organic substituents that determine the unique properties of the polymer. The success of this technique is to control the specific ratio of monofunctional (M), difunctional (D) and trifunctional (T) groups in the hexamethyldisilazane backbone, which also contributes to the formation of unique properties of the polymer.
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