Silicone based anti-corrosion material
Si-COAT is a name broadly used to refer to a number of specialized coating products. Each member of the Si-COAT family is a 1-part RTV (room temperature vulcanizing) coating that is available in naphtha as well as VOC-free (volatile organic compound free). The entire product range can be applied by spray, brush or roller and offers many advantages over conventional coating systems. These advantages include:
- Simplicity of use,
- Lower overall cost factor,
- Superior performance characteristics, and
- Environmental friendliness
Simplicity of use
Because of their 1-part formulation, Si-COAT™ does not require any additional mixing in the field. Only a simple hand stirring is sufficient to ready the coating for application. All Si-COAT products display good adhesive properties. Normally, substrates do not require sandblasting, profiling or priming. This results in significant project cost savings.
Lower overall cost factor
Surface preparation for Si-COAT is minimal. Only water blasting (SSPC SP12) to remove loose rust and dirt is required. Rusty surfaces without any loose rust provide excellent adhesion to Si-COAT. Oily surfaces need to be cleaned as per SSPC SP1. The cost effective minimal surface preparation feature, without environmentally sensitive sand blasting, is a big plus.
When computing the cost of a coating, it is sound to annualize the cost by taking into account the lifespan of the product. Si-COAT coatings have consistently displayed a longer lifespan than conventional coatings. The reasons for this are discussed in the following paragraph. In the case of unforeseen damage to the coating, Si-COAT products are simple and extremely cost-effective to repair. Any exposed substrate due to mechanical damage (scratch) need only be freed of loose rust, dirt or greasy residues and coated over with Si-COAT brush application or spray.
Si-COAT outperforms conventional coatings on many counts. Of primary significance is the strong adhesive property of Si-COAT. Upon fully curing, the coating is bonded to the substrate via oxygen-oxygen bonds. This type of bond is extremely strong and lends the coating many positive attributes. As well, Si-COAT coatings are elastomeric and will elongate a minimum 150%. The adhesive properties of Si-COAT combined with its elastomeric properties work together to eliminate rust creep under the coating’s surface.
When steel corrodes, it can swell volumetrically by up to 12 times. Conventional coatings are not elastomeric in nature. When these conventional coatings are scratched to expose the bare steel underneath, the steel will corrode and accordingly swell in size. The non-elastomeric conventional coatings (which lack the adhesive and elastomeric properties of Si-COAT) cannot tolerate the swelling rust and “pops” off, revealing more bare steel, which further corrodes. This cycle continues and corrosion creeps under the surface of the conventional coating. In the case of Si-COAT, however, the coating is able to conform to the swelling rust, and combined with the very strong adhesive properties of the coating, Si-COAT is able to limit corrosion creep due to a scratch or scuff.
Unlike conventional coatings, Si-COAT displays unsurpassed tolerance to UV exposure. The basic raw materials for conventional coatings (alkyds, epoxies, urethanes, etc.) are derived from petroleum. Hence, the backbones of these coatings are made of carbon-carbon (C-C-C- …) bonds. The backbone of Si-COAT coatings, however, is made of alternating silicon-oxygen-silicon (Si-O-Si-O-Si- …) bonds. Relatively speaking, the strength of the carbon-carbon bond is weaker than the strength of the silicon-oxygen bond. In layman’s terms, the space between silicon atoms bonded to an oxygen atom is much smaller than the space between a carbon atom bonded to a carbon atom. As a result, UV light (wavelength = 200 to 400 nanometres) is able to penetrate the space between carbon-carbon bonds, but is unable to penetrate the space between silicon-oxygen bonds. UV light is a form of energy. When this light penetrates the carbon-carbon bond, it subsequently energizes the bond. The consequence of this action is to cause the carbon-carbon bond to break after time. All this occurs at the microscopic level, but has macroscopic effects. Some macroscopic effects are embitterment of the coating, discoloration of the coating, chalking of the coating and loss of adhesion of the coating. Some conventional coatings employ UV blockers, but nothing will perform better than a coating that is by its inherent nature impenetrable to UV light.
Some find this explanation of Si-COAT’s tolerance to UV light difficult to appreciate. The best way to illustrate the coating’s UV tolerance is to point out that, chemically speaking; it is a cousin of glass. Both glass and Si-COAT™ employ alternating silicon-oxygen bonds. One might say that Si-COAT is, in fact, a rubberized form of glass. Everyone is familiar with glass and can attest to the fact that it never damages under exposure to UV light. It does not discolour, chalk, fade, melt, or compromise any of its other physical properties under UV light even after decades of constant exposure to UV light. The same holds true for Si-COAT.
The tremendous strength of the silicon-oxygen bond affords Si-COAT another benefit over conventional coatings. It has resistance to a vast number of chemicals including acids, bases, alkalis, etc. Again, glass, a cousin of Si-COAT will perform similarly, which is why it is such a widely used material in laboratories.
Si-COAT is also physically stable under a wide range of temperatures (+250°C to -60°C). Within this temperature range, Si-COAT will display the same physical properties it does at room temperature.
Above all, in today’s atmosphere of diminishing resources and greater environmental awareness, the Si-COAT families of coating products were designed to impact the environment very minimally. This has been achieved through the creation of a coating system that is tolerant of a variety of substrate conditions. Because Si-COAT requires no sandblasting of the host surface, the environment is not subject to the abuse associated with this activity.
The raw materials for Si-COAT are derived from silica rock or sand. As a result, the finished product is as inert as sand. Unfortunately, the same cannot be said for conventional coatings, which are based on petroleum oil derivatives.
Finally, because of the longevity of the Si-COAT product, the user can be assured of long-lasting protection that reduces maintenance and capital replacement budgets; a relief to the corporate balance sheet and, in an environment where resources are becoming scarcer, to Mother Nature as well.
The families of Si-COAT products were carefully refined over two decades of R&D work. CSL has utilized its in-house engineering capabilities to build a plant that manufactures innovative silicone products starting from a monomer input. Our self-designed polymerization processes and formulation techniques afford us the creative control necessary to produce the highly specialized Si-COAT product range. Si-COAT family of products has intellectual property rights protection.
Successful applications and satisfied customers can be found throughout the world. In their greater than 15 year history not a single failure of Si-COAT has been reported and no one has yet needed to reapply Si-COAT™ or any other product in its place.
- Η Μεταλλική επιφάνεια χρειαζεται ΜΟΝO Υδροβολή καί 1 χέρι Si-Coat 579 (200-250 mic. DFT) για αντισκωριακή προστασία
- Εφαρμόζεται και σε γεμάτες Δεξαμενές Καυσίμων χωρίς να επηρεάζεται η λειτουργία τους και η χρήση τους.
- Έχει την ιδιότητα να ‘’αυτοθεραπεύεται’’ λόγω τής ελαστικότητας (180%) της σιλικόνης πού περιέχεται σε αυτό
- Αντέχει πολύ περισσότερο από τα άλλα υλικά στα ‘’χτυπήματα’’
- Λογώ της ελαστικότητας του, μπορεί νά ακολουθεί τις μεταβολές (διαστολές–συστολές) των μετάλλων
- Εχει την ιδιότητα να αυτοκαθαρίζεται, μετά από κάθε πλύσιμο, με φυσικό τρόπο (δυνατή βροχή) ή τεχνικό τρόπο (υδροβολή) λόγω της εξωτερικής στιλπνής επιφανειας του,
- Εφαρμόζεται και σε περιβάλλον που η υγρασία κυμαίνεται σε υψηλά επίπεδα, π.χ. 90%.
- Δεν επηρεάζεται από διαβρωτικό περιβάλλον
- Η χρήση θαλασσινού νερού ως τρόπος πλυσίματος ΔΕΝ επηρεάζει την αντισκωριακή προστασία του υλικού
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