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Silanes are widely used in sealants and adhesives to improve product adhesion. Sealants usually have a dual purpose. They can prevent water, air and chemicals from passing through the application area, and in some cases can also be used as adhesives. Silane can form lasting bonds on metals, glass, ceramics and other surfaces. Therefore, these types of sealants are used in a range of industries, including aerospace, automotive, and construction.
The silane coupling agent will act as an adhesion promoter at the interface between the sealant or adhesive and the substrate. Organofunctional silanes use mechanisms similar to those previously described to bond inorganic substrates and sealants or adhesive polymers. The choice of silane coupling agent is to optimize the combination by matching its organic functionality to the polymer. Table 1 suggests silanes for evaluating various polymer systems.
Generally, silane mixtures are used as adhesion promoters to provide enhanced hydrophobicity, thermal stability, or crosslinking at the bonding site.
Silanes can be mixed into adhesive formulations or used as primers on substrates. When added to the adhesive formulation, the silane must be free enough to migrate to the interface area between the adhesive/sealant and the connecting surface. The structure and reactivity of the silane will affect the migration ability of the silane. Often more than one silane is evaluated for an application to select the best performing silane empirically.
The most effective way to improve adhesion is to apply silane as a primer on the surface, and then apply an adhesive/sealant. In this way, the silane will be on the surface, so at the interface, it can enhance the adhesion between the polymer and the substrate. Silane primer is usually a dilute solution of 0.5% to 5% silane in alcohol or water/alcohol solvent. Wipe or spray them on the substrate and let the solvent evaporate.
When added to a sealant or adhesive or used as a primer on a substrate, the increase in adhesion is usually achieved as the adhesive shows greater resistance to moisture erosion at the interface.
Table 1. Silane coupling agent recommendations for various polymers-match organic reactivity to polymer type
Silanes can be used to crosslink polymers such as acrylates, polyethers, polyurethanes, and polyesters. The organofunctional part of the silane can react with and bond with the polymer backbone in the sealant or adhesive. The alkoxysilyl groups on the silane should not be crosslinked prematurely in order to provide crosslinking when the sealant or adhesive is applied to its intended application.
Silane-crosslinked sealants or adhesives can exhibit enhanced properties, such as:
The ability of alkoxysilanes to react quickly with water makes them useful in sealant and adhesive formulations to trap excess water. A very common moisture scavenger is vinyl trimethoxy silane. The presence of the vinyl group attached to silicon increases the reaction rate of methoxysilane with water, thereby effectively eliminating water. Methanol is formed as a by-product, and vinyl silane is cross-linked into an inert substance in the formulation. Other silanes, such as methyltrimethoxysilane, are also used as water scavengers.
The silane water scavenger in the formula can:
Silane coupling agents are used to increase the adhesion between fillers and polymer matrix in sealants and adhesives.
The silane coupling agent treatment on the filler can provide:
In 2000, Dow Corning faced an increasing number of global competitors entering the standard silicone business. At the same time, for more and more customer groups called "price seekers", they have little or no need for product-related services, and price has become the driving force.
Dow Corning needs to defend its position as a supplier of innovative silicon-based materials and solutions (in most cases, bundled and priced). Dow Corning knew they needed to find a better way to accurately meet customer needs.
It’s time to adopt a game-changing strategy-at the same time:
Dow Corning decided that the best way to use the potential of mature market segments without reducing the value of Dow Corning's products is to create an independent brand. The brand will provide a clearly defined value proposition and product portfolio through a network-enabled platform to provide competitive prices.
The product set will be a wide range of standard silicone products, usually regarded as "commodities" by customers. These standard products will be-and still are-manufactured by Dow Corning.
The tone will be "unpretentious"-just plain business terms and conditions, high-quality products, reliable supply and market-driven prices. short. Sweet. Speaking of the idea.
With the launch of the XIAMETER® brand in March 2002, Dow Corning completely changed the way they do business. Specialty silicone products, services and solutions continue to be part of the Dow Corning® brand business. The XIAMETER brand meets the needs of "price seekers" who purchase standard silicone products.
It is beneficial for them to seek higher business efficiency on a global scale by supporting the business model of the network. It helps Dow Corning maximize productivity and reduce human error, while maintaining cost competitiveness with customers. The XIAMETER® brand did not erode the Dow Corning brand as some people feared, but made it stronger. The two brands are in harmony and helped Dow Corning significantly improve its financial performance during this period.
From 2002 to 2009, the XIAMETER® brand was an online company with clear business rules, providing commonly used standard silicones at transparent, market-driven prices. However, these business rules only allow high-volume orders. There is no technical service. Delivery time is 7-20 days. And only 400 standard silicone products are available through www.xiameter.com.
In 2009, Dow Corning expanded the XIAMETER® business model—for the same reason we originally launched it—to meet customer needs based on intelligent customer segmentation analysis. Xiameter believes that all customers (not just high-volume buyers) need to be able to purchase standard silicone products at market-based prices. Based on the success of the original Xiameter model, company leaders are confident that the extended model will work-both for customers and Dow Corning. It did it!
The XIAMETER® business model was expanded in June 2009 and again in 2011, and now offers thousands of standard silicone products. In addition, the model is no longer only suitable for high-volume customers. There are more volume-quantity options. Through Xiameter's transparent price levels, customers can choose the most suitable price for them according to the quantity they need. They can purchase multiple items in a product line and get larger discounts. They can lock in price and quantity commitments through online supply agreements. They can also choose the credit terms that best suit them, which can be changed every time they order. In addition, customers who require smaller quantities, shorter lead times or more flexible ordering options can purchase XIAMETER® brand products through their local distributors.
With today's XIAMETER® brand, customers can obtain all the standard silicones they need in the way that suits them best. What they want. Whenever and wherever they want it. In a world of traffic jams, music suspensions and long queues in supermarkets, we think this is a good choice.
For more information on this source, please visit Xiameter.
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