|Place of Origin:||China|
|Packaging Details:||25kgs per bag/carton|
|Chemical Description:||Nonionic Etherified Guar Gum||INCL:||Hydroxypropyl Guar|
|Cas No.:||39421-75-5||Application:||Thickeners,Stabilizers,Emulsifiers,rheology Modifier|
|Color:||Off White To Yellowish Powder;||Purity:||99%|
guar gum manufacturers,
39421 75 5
Hydroxypropyl Guar Gum Guar For Paints PH Value 5.0～7.0 JK-703S
Chemical Name: Hydroxypropyl Guar
CAS Number: 39421-75-5
JK-703S is a rheology modifier with an extra strong delayed swelling, of medium viscosity, based on natural polysaccharides, developed for an optimal rheologic behavior of waterborne wall paints, and other purposes up to pH of max.12. JK-703S has a very high molar substitution which makes it suitable for alkaline conditions.
|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-703S 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-703S 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-703S 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-703S 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-703S will stay within the specifications for 12 months, at least
Application and dosage
Using JK-703S, it is possible to formulate waterborne paints with a final viscosity similar to such ones containing cellulose-ether (medium grades). The optimal concentration of JK-703S has to be determined by the user himself within his own formulations.
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-703S 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-703S stabilizes pigments and fillers and regulates the water
Contact Person: Chris Gu