Dr Andrea Battisti
Application Manager Adhesives & Sealants
Omya International AG
Dr Andrea Battisti is Application Manager Adhesives & Sealants at Omya International, and is globally responsible for technical support and innovation in calcium carbonates for adhesives and sealants. His expertise is particle surface engineering to enhance the final composite material properties. He gained his PhD in 2010 with work on nanoparticles in polymeric materials and since then he has been leading innovation projects on the improvement of the mechanical and application properties of materials in both academia and industry.
Efficient processing with low moisture calcium carbonates
This is the first of a series of three papers on the science of calcium carbonate in adhesives and sealants. The subsequent publications will tackle the fundamentals of rheological modification and mechanical reinforcement.
Calcium carbonates are the most used filler in adhesives and sealants. While coarse products (extenders) are essentially aimed at cost reduction, fine and treated products (functional fillers) offer added functionalities such as mechanical reinforcement and rheological modification.
When micrometric and submicrometric products are used in moisture-curing and moisture-sensitive systems, the amount of water carried into the systems by the functional fillers needs to be taken into consideration. To prevent variability of the product quality and performance of the adhesives and sealants, costly corrective measures are required, including: filler pre-drying, long mixing times under vacuum, heating/cooling and chemical drying.
Given the economical and operational relevance of moisture in calcium carbonate fillers, it is important for the formulator and the production engineer to understand the root cause of the problem. This paper will describe the fundamental behaviour of calcium carbonate in relation to environmental humidity. We first describe the mechanism using model systems and then expand to interpret real-world production conditions. The fundamentals of surface treatment, a common mitigation technology, will be presented. We will then outline advanced process and material engineering solutions. Finally, we will give an overview of the industrial relevance of the phenomena, supported by a separate set of case studies.
Thursday, 12 September 2019, 17:00 - 17:30