QPAC® poly(alkylene carbonate) Binders/Sacrificial Materials for High Quality Products
Are you interested in a binder that decomposes quickly and completely? We have a unique family of polymeric binders based on carbon dioxide, called QPAC® poly(alkylene carbonate) binders.
QPAC®25 poly(ethylene carbonate), QPAC®40 poly(propylene carbonate), QPAC®100 poly(propylene/cyclohexene carbonate), and QPAC®130 poly(cyclohexene carbonate) are all commercially available. This family of products can be individually modified for your specific application. In addition, QPAC®60 poly(butylene carbonate) has been successfully synthesized on the lab scale.
These materials have an exciting blend of unique properties that translate into superior performance for advanced ceramics, sealing glasses, thick film paste systems, powdered metals, composites, and MEMS structures. For example, QPAC® poly(alkylene carbonate) binders decompose completely in air by 300°C, starting at 200°C. This decomposition temperature is at least 100°C below that of many binders currently used.
Complete burnout also occurs by 340°C in inert atmospheres like in nitrogen, argon, and hydrogen and in reduced atmosphere. Under vacuum processing, the burnout temperatures are even lower. So whether you’re producing dielectric materials, FPD components, diamond cutting tools, brazing pastes, solid electrolytes, fuel cells, sealing glass materials, or electronic inks, binder burnout times can be significantly reduced.
Because QPAC® poly(alkylene carbonate) binders burn out completely, they yield strong sintered parts, virtually contaminant-free. Ash residues are typically less than 10 ppm for pure binder. Based on 3% binder use levels, residual ash in finished parts would be well under 2 ppm, suitable for applications where purity is essential.
QPAC® poly(alkylene carbonate) binders and sacrificial materials are also unique in that they burn out mildly, without violent gas formation. Thus, whether your process operates in an oxidizing, reducing or inert atmosphere, you can expect fewer rejects due to cracking. You can also easily predict decomposition, giving you more reliable control and higher-quality products.
Being soluble in many common solvents, QPAC® binders can be adapted for most processes. Also, stable aqueous emulsions are available for water-based processing.
In our tests as well as tests at customer facilities, green and fired strengths and densities of parts prepared with QPAC® poly(alkylene carbonate) binders match those of parts made with commercial binders that either decompose incompletely or decompose at much higher temperatures. Furthermore, QPAC® poly(alkylene carbonate) binders produce more consistent parts.