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Phenol modified DCO Alkyd (Silkyd 110 & 115) (Technical Note: ST 16)
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DCO modified phenolic varnishes (Silac V10D, Silac V20D)
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(Silkyd 110 and Silkyd 115)
The Rosinated Alkyds are very popular in the Paint Industry. They were introduced primarily to reduce the cost of the Alkyd and to improve the drying time. But these advantages are gained at the cost of sharp deterioration of the properties of the original Alkyd, particularly its chemical and water resistance and out door durability. Even the cost advantage is not applicable now as the price of Rosin is comparable with that of Alkyds.
Modification with Styrene or Acrylic materials improves the film properties but the cost of the Alkyd goes up prohibitively for most of the applications.
Keeping these considerations inview we have developed Cardphenol and CNSL modified DCO Long oil Alkyds known as Silkyd 110 and Silkyd 115 respectively. Modified with Cardphenol or CNSL methylols reduce the drying time, improve the resistance to chemicals and water and outdoor durability, yet the cost is lower than the resonate Alkyd. The only disadvantage that these materials have is their pale colour and hence they can not be used for pure whites, but slightly off white paints such as the so called Hospital White are possible especially with Silkyd 110 being of lighter colour.
The Cardphenol or CNSL resins are reacted with Alkyd and have both ester and ether linkages in the structure. They exhibit outstanding water, alkali and chemical resistance combined with excellent weather resistance particularly because the modifying methylol is based on phenol. The C 15 aliphatic chain further improves the flexibility and water resistance of the resultant polymer.
They are clear transparent and comparatively pale resins and are uniquely suitable as base for formulations of synthetic enamels of superior quality with improved chemical and mar resistance and outdoor durability.
They can replace with advantage of the Rosinated and pure Alkyds for all off white compositions and even Styrenated and, Acrylated Alkyds for some specific applications.
1.1 The comparative film properties of Silkyd 110 and 115 with pure and rosinated Alkyds are given over leaf.
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The film properties of Silkyd 110 and Silkyd 115 made into 30% Solids in MTO with recommended driers are compared with those of pure long oil Alkyd (66%) and rosinated Alkyd varnish of same solid contents.
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Abbreviation: NE – No effect, SB – Slight blushing, SE – Slight effect.
( ) Figures within brackets indicate the number of hours tested.
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Silac V 10D Silac V 20D – They are phenolic Varnishes in which phenolic component, CNSL/Cardphenol aldehyde is modified with a Conjugated oil such as DCO. The C 15 H 27 group of phenol methylol reacts with the residual OH group in DCO leading to a Complex molecular structure which imparts better resistance against water and chemicals. They have higher exterior durability in addition to better adhesion and flexibility.
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The film properties of Silac V 10D and V 20 D are compared with those of Rosinated Alkyd after making them into a Varnish with 30% Solids and adding the recommended driers. The Viscosity is measured with 45% Solid Varnish in MTO in all the three cases.
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Abbreviation: NE – No effect, SB – Slight blushing, SE – Slight effect.
( ) Figures within brackets indicate the number of hours tested.
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All the four products are compatible with drying oils, epoxies, estergums, phenolics and maleics, and to a limited extent with chlorinated resins. They are not compatible with urea.
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They are soluble in all proportions in MTO and other paint solvents such as Xylene, Napthas, Ketones etc.
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They are supplied in 200 Kg/Ltr and 20 Kg/Ltr packing.
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Drier combination such as 1% lead, 0.1% Cobalt, 0.2% Manganese metals on solid contents is recommended.
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Off white Paints and Enamels
Insulating Varnishes
Redoxide Zinc Chrome Primers
Wood can Lacquers
Wood Finishes
Bobbin Paints
Aluminium Medium
Outdoor decorative Paints.
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The following compositions can be regarded as suggestive only to illustrate the applications of this very versatile and popular resin. Silac V 10D and Silac V 20D can also be used if lower scratch hardness and longer drying time are acceptable. Allowance will have to be made for the lower solid content in this case.
10.1 High Gloss Enamel – Hospital White:
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Add driers and the solvent as required.
10.2 High Gloss Enamel – Post office Red:
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Add solvent and the driers as required.
10.3 High Gloss Enamels – Dark Smoke Gary
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Add solvent and the driers as required.
10.4 Anti Corrosive Primer:
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Add more solvent if required and the driers as recommended.
10.5 Insulating Varnish
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Add usual driers as required.
In case body is required add a Hydrocarbon resin 20 to 50 parts by weight or ester gum, maleic resin and process.
10.6 Aluminium Paint: (dual pack leafing)
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Add driers as required.
Leafing Aluminium paste required as per IS specifications separately packed.
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The Service of our well equipped Application Laboratory and technically qualified staff are at your disposal to provide further technical information and suggestions in regard to the applications of these Varnishes.
Caution: Because we cannot anticipate the conditions under which our products may be used, we do not guarantee the applicability or the accuracy of the above information. Users should make their own tests to determine the suitability of our products for their particular purpose. The products are sold without any such warranty either by express or implied. Moreover, the above information is not intended as recommendation to use our product in the infringement of any patent.
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