In general, KRISHNOL -G is insoluble in most organic liquids. It is non-yellowing and unreactive with paint vehicles and pigments. It will not detract from the durability; rate of drying, wash ability or other properties attributed to good finishes.
KRISHNOL -G posses certain advantages over other thickeners in that its ability to body organic liquids is not affected by impurities such as water, phenol, polar solvents and slightly basic or acidic components.
KRISHNOL-G will maintain uniform viscosity over long period of aging/ this is in contrast to some thickeners, which continue to body a coating until poor flow properties result, or which, thin out due to the effects of polar ingredients in the system. This leads to improper leveling brush marks and other desirable properties.
KRISHNOL -G is an easy replacement of Aluminium stearate. KRISHNOL -G can be used directly during grinding or can be made into gel form under high speed stirring (min. Activation temperature is 350C-550C).
THE MAXIMUM BENEFICIAL EFFECTS OF KRISHNOL -G CAN BE OBTAINED SIMPLY BY ADDING IT AS PART OF THE PIGMENT GRIND.
KRISHNOL -G will impart such desirable properties as thixotropic body pigment suspension, anti-sag, improved brushability and penetration control to a variety of protective coatings.
KRISHNOL -G Is Recommended For
Processing in dispersion equipment, which does not develop heat (to maximum of 550C) and with aliphatic solvents.
Processing in heat developing dispersion equipment. KRISHNOL -G should be added at the beginning of the paint dispersing process preferably by premixing in Solvent/Binder for about 5 minutes before other components are added. For optimum incorporation of KRISHNOL -G into a Paint System, both a lower and upper processing temperature must be observed. A minimum temperature of about 350C is necessary to properly build the thixotropic structure.
These temperature limits are
500C -800C for aliphatic solvent systems
350C -550C for aromatic, oxygenated & ester type solvent systems.
If a temperature of about 550C is exceeded, soft gel like particles may appear on return to room temperature (seeding).
The presence of some aromatic solvents lowers this upper temperature limit should this limit may be exceeded, the formation of particles can be prevented by a mild continuous stirring on the cool down to 450C or below.
Within the prescribed temperature range, KRISHNOL -G should be subjected to as much shear as possible during processing. The more intense the dispersing or grinding action, the more pronounced and immediate the effect.
Use Of KRISHNOL -G In Varnish
It is recommended to use KRISHNOL-G at the use level of 0.5 to 1.0% in varnish & mix in high speed mixture till activation temperature of 400C is achieved and all particles of KRISHNOL -G are dissolved fully in media. It is being used in Synthetic Varnish, High Gloss Varnish, Insulating Varnish, Clear Varnish, and Copal Varnish etc.
Recommended Processing Temperature Range For KRISHNOL -G With Speed Dispersing
570C - 740C
330C - 490C
For KRISHNOL - G it is best to process in the middle of the recommended process temperature ranges. This provides max. Consistency & efficiency regardless of normal raw material variance, and assures that processing temperature will stay within the min. and max. Limits.
Too low a processing temperature leads to incomplete rheological developed excessively high processing or storage temperature may partially solubilize the KRISHNOL - G. That leads to the loss of rheological structure and formation of soft gel particles upon cooled down.
The length of time under optimum processing temperature is very important for all organic rheological additives like KRISHNOL - G.
High-speed dispersion equipment requires the organic rheological additives to be within the recommended processing temperature aid with shear for 15 - 30 min.
For Ball Mills, 3 Ball mills and Sand Mills:
See specific recommendations given at the end of this data.
False Body & Viscosity Measurement
KRISHNOL - G will develop what appears to be an excessively high viscosity when the coating system containing KRISHNOL - G is cooled down without agitation. This excessively high viscosity is termed .False Body.
It is a temporary, permanently reversible low shear rate viscosity increase.
Hot batches allow cooling down overnight without agitation will appear gelled the following day. Turning on the disperser and mixing a few minutes will break the false
False body can lead to errors in quality control viscosity measurements.
If viscosity measurements are delayed, false body can occur in the sample cup, leading to erroneously high viscosity measurements.
Mixing with a spatula will break down the false body and allow accurate viscosity measurements.
KRISHNOL-G is designed for aliphatic and aromatic solvent based paints. KRISHNOL -G imparts an almost ideal balance between sag control and leveling. It is particularly suited for High build systems, such as chlorinated rubber. Typical use levels are 0.2% to 0.8% based on total system weight.
KRISHNOL - G may be used in Glycol ethers such as cellosolve or carbitol, if processing temperatures are within 300C to 400C.
KRISHNOL - G is suitable for following Medias:
MEDIUM POLARITY MEDIA
LOW POLARITY MEDIA
Haptane Odorless White Spirit
The optimum level of KRISHNOL - G will vary, depending on the type of the system involved.
In paints, a typical starting level of usage of KRISHNOL - G is 0.2% to 2% by the weight of the total composition.
In caulking compounds and mastics, between 0.2% to 0.2% is generally, required.
The following Binders are among the most important used in conjunction with
KRISHNOL - G.
(a) All kinds of alkyd resins including modified types such as styrenated alkyds, chlorinated rubber.
(b) Binders containing chlorine such as polyvinyl chloride, its copolymers & post chlorinated products,
as well as chlorinated polyethylene.
(c) Curable Epoxy coatings including solvent free systems.
(d) Epoxy ester
(e) Tar or bitumen and their combinations
(f) Two component polyurethane systems.
Shows good thixotropic, thickening and antisettling effect,
Promotes pigment and filler suspension,
Controls liquid penetration into porous surfaces,
Provides sag and slump control,
Provides excellent package stability,
Does not react with pigments or Binders,
Is easy to disperse.
Reduction of sagging and dripping,
Application of thick coatings
Prevention of pigment floating, flooding and settling,