|Place of Origin:||China|
|Packaging Details:||25kgs per bag/carton|
|Synonyms:||Guar Gum 2-hydroxypropyl Ether||INCL:||Hydroxypropyl Guar|
|Cas No.:||39421-75-5||Application:||Thickeners,Stabilizers,Emulsifiers,rheology Modifier|
|Color:||Off White To Yellowish Powder;||Purity:||99%|
39421 75 5,
industrial guar gum
Extra Strong Delayed Swelling Modified Guar Gum For Paints JK-702S
Chemical Name: Hydroxypropyl Guar
CAS Number: 39421-75-5
JK-702S is a rheology modifier with an extra strong delayed swelling, of medium-high viscosity, based on natural polysaccharides, developed for an optimal rheologic behavior of waterborne wall paints, and other purposes up to pH of max. 11.
|Chemical description||Nonionic etherified guar gum|
|Appearance||Ivory fine powder|
Particle Size through US 60 mesh
through US 120 mesh
(25℃,2% sol., Brookfield, Spindle 4#, 20RPM)
Strong delayed solubility
The production process of JK-702S includes a special surface treatment which delays the swelling of the product in water at a neutral or slightly acidic pH. This enables the user to disperse JK-702S easily in water without getting lumps, even at much higher than usual concentrations. The visible swelling delay of a 2% solution happens after approx. 25 minutes at neutral pH and 20°C .By increasing the pH to 8.5 – 9 or higher, the swelling occurs rather quickly.
Solutions of JK-702S behave pseudoplastically; i.e. the viscosity decreases as a function of increased shear-rate, independent of time. Furthermore the viscosity increases at rising concentration and decreases at rising temperature.
Stability against biological attack
As a consequence of the high degree of substitution,JK-702S contains almost no germs and shows reasonable resistance against bacteria, moulds and other micro-organisms. Nevertheless it is necessary to add a suitable in-can preservative agent to the paint formulation.
If stored in unopened, original bags, under cool and dry conditions and away from heat, JK-702S will stay within the specifications for 12 months, at least
Application and dosage
Using JK-702S, it is possible to formulate waterborne paints with a final viscosity similar to such ones containing cellulose-ether (medium-high grades). The optimal concentration of JK-702S has to be determined by the user himself within his own formulations. Usually the dosage range in wall paints is around 0.2-1.0%.
A fast increase of viscosity is obtained by adding alkaline (e.g. caustic soda) right from the beginning of the paint
production process, but always just after having added JK-702S to the neutral water, and dispersed fully. Adding alkali only in the letdown allows dispersing at lower viscosity. This simplifies the dispersion of pigments and fillers:
Components containing borates in the formulation are to be strictly avoided: gelification may occur!
Further to the thickening effect, JK-702S stabilizes pigments and fillers and regulates the water
Contact Person: Chris Gu