Styrenated Cardphenol and CSNL Resins (Technical Note: ST 11)

Introduction Specifications Comparative Film Properties Application Technique Storage Recommended uses Typical Formulations Technical Service

Silex-55 and Silex-60 are Phenolic Resins respectively based on Cardphenol or CNSL modified with Sytrene. They are clear transparent viscous resins with light golden colour film in case of Silex-55 and reddish brown in case of Silex-60. They are highly suitable for surface coating applications where outstanding film properties and very high resistance to water and chemicals are required.

1.1 Compatibility: Both resins are compatible with all drying oils, alkyds, epoxies, estergum phenolics and maleics etc. in all properties and only to a limited extent in chlorinated resins specially chlorinated rubber. They are not compatible with Urea resins.

1.2 Solubility: Both Silex-55 and Silex-60 are soluble in Mineral turpentine oil (MTO) in all proportions. They are also soluble in most of the common paint solvent like Xylene, Napthas, Ketones, Esters, etc. wherever they are to be used along with other resins of limited solubility in MTO like epoxies  and vinyls etc., other suitable solvents like Xylene, Ethyl ketone etc., can be used.

1.3 Mode of Supply: The above resins are supplied in 200 to 20 kgs. packings as 100%, 80% and 65% solids in MTO. For most of the paints and varnish applications the 65% execution is recommended as it has better film properties.

1.4 Recommended Driers: Driers combination such as 1% lead or 0.4% zirconium, 0.1% cobalt and 0.1% Manganese as metals on the solid content of the resin is recommended. If required the proportion of Manganese can be increased to 0.3% with beneficial effects. After addition of driers ageing for 24 hours is recommended.

2.0 Specifications

 

Resin Execution Consistency Specific Gravity 30oC Colour Viscosity* (poises) Drying Time ** Scratch Hardness Air Dried (gms) Acid value In air at 30oC (Hrs) Baking at 120oC (Min) HD SD HD Silex-55 100% Semi Solid 0.95 ± .02 Golden Yellow 0.85 to 1.2 ˝ 3˝ 15 1200 Max 5 Silex-60 Reddish Brown 1.5 to 2.8 ˝ 4 20 1100 Max 7 Silex-55   80% Highly viscous pourable 0.95 ± .02 Golden Yellow 2.3 to 2.8 ˝ 3 5 1200 Max 5 Silex-60 Reddish Brown 2.6 to 3.2 ˝ 3˝ 20 1100 Max 7 Silex-55   65% Viscous free flowing 0.95 ± .02 Golden Yellow 3.0 to 4.0 ˝ 2˝ 15 1200 Max 5 Silex-60 Reddish Brown 3.5 to 4.5 ˝ 3 20 1100 Max 7

3.0 Comparative Film Properties

The film properties of Silex-55 (65%) and Silex-60 (65%) made into 30% solids in MTO with recommended driers are compared with those of pure long oil alkyd (65%) varnish of same solid contents.

Film Properties Silex-55 Varnishes Silex-60 Varnishes 66% oil length alkyd varnishes Colour Golden Yellow Reddish Brown Light pale Hard dry time 2˝ to 3 hours 3 to 3˝ hours 4 to 5 hours Appearance Highly glossy Highly glossy Glossy Scratch Hardness 1200 gms. 1100 gms. 600 gms. Adhesion Good Good Good Flexibility Good Good Better Resistance to - Water NE (100) NE (100) SB (8) -Sodium Carbonate 5% NE (100) NE (100) SB (25) - Sulphuric Acid 2% NE (100) NE (100) SB (48) - White Spirit NE (100) NE (100) NE (100) - Linseed Oil NE (100) NE (100) SB (100)

N.B: NE – No effect, SB-Slight blushing, SE-Slight effect, FB-Film blushed, FD-Film detached, () figures within brackets indicate the number of hours tested.

4.0 Application Technique

Films of Silex 55 or 60 can be applied either by brush, spray or by flow technique.

5.0 Storage

The storage stability of Silex 55 and 60 is satisfactory for 6 months or more if stored in air tight containers in a cool place.

6.0 Recommended uses

As Silex 55 is pale coloured resin having very glossy film, it can be specially used as medium for light coloured highly glossy non-white enamels by suitable pigmentation. Silex 60 is excellent for darker coloured products.

Some of the major applications of these resins are: baking or air drying super enamels; food can lacquers; insulating varnishes; wood finished and bobbin lacquers; marine paints; industrial/chemical resistant paints; hammertone finishes; printing inks etc.

6.1 Caution: In case of reactive pigments such as Zinc Chrome, Zinc Oxide, basic lead Sulphates etc, it is advised that they are not ground along with the main pigments in the resin as there is a possibility of reaction. They should be added only in the end allowing slight grinding for proper dispersion.

7.0 Typical Formulations

The following compositions can be regarded as suggestive only to illustrate the applications of these very versatile and popular resins.

7.1 High Gloss Enamel: Cream Colour

Titanium dioxide 300 parts by weight Aluminium Stearate 6 parts by weight Silex-55 (65%) 860 parts by weight Antiskinning Agent (Ethylmethyl Ketoxime) 0.13 part by weight

Add driers and solvent as required.

7.2 High Gloss Enamel: Post office red

Silex 55 to 60 (65%) 38.5 parts by weight Linseed Standoil 25 poises 5.0 parts by weight Hansa Red 2.2 parts by weight Red Oxide 0.1 part by weight China Clay 6.0 parts by weight Whiting 5.0 parts by weight Barytes 1.5 parts by weight Anti-settling Agent 0.3  part by weight

7.3 High Gloss Enamel: Dark Smoke Grey

Titanium Dioxide 47.6  part by weight Talc 4.7 parts by weight Carbon Black 2.8 parts by weight Marine Blue 1.2 parts by weight Silex 55 or 60 (65%) 154.0 parts by weight Antiskinning Agent 0.4 part by weight

Add solvent and the driers as recommended.

7.4 Anticorrosive Primer

Basic Lead sulphate 20.0 parts by weight Aluminium powder (66%) 10.0 parts by weight Iron oxide 10.0 parts by weight Barytes 10.0 parts by weight Silex 55 to 60 (65%) 58.0 parts by weight MTO 5.0 parts by weight Naptha 8.0 parts by weight

Add more solvent if required and the driers as recommended.

7.5 Hammertone Enamel

Pigments 6.0 parts by weight Ortho-xylene 6.0 parts by weight Silex 55 (80%) 38.0 parts by weight Ball mill for 12 hrs. After Ball milling add Fatty acid 2.0 parts by weight Silicon Oil 0.9 parts by weight Ortho-Xylene 10.0 parts by weight Aluminium paste (non –leafing) 16.0 parts by weight

Further Ball mill is for 10 to 12 hours. If Ortho-Xylene is not available, use commercial Xylene and add driers as usual.

7.6 Insulating varnish

Silex 55 (100%) 50 parts by weight DCO monomer 50 parts by weight Heat up to 160oC to 180°C for 15 to 20 minutes Thin down with Xylene/MTO (1:1) 100 parts by weight

Add usual driers

In case body is required, add a hydrocarbon resin such as Capcolite (Comphor and Allied Resins Ltd.) 50 parts by weight, or maleic resin and heat up to 180^oC.

7.7 Aluminium Paint: (Dual pack leafing)

Silex 55 (65%) 8.3 parts by weight MTO 9.7 parts by weight Silicone Surfactant 0.1% part by weight

Add driers

Leafing Aluminium paste 2 Kg. separately packed.

8.0 Technical Service

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 resins.

Caution: Because we can not anticipate the conditions under which our product 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.