Polyacrylic acid thickener is a polymer electrolyte, Car Flags For Sale there are two types of alkaline swelling and alkaline dissolution.
A. Alkaline swelling of polyacrylic acid thickener is a cross-linked copolymer emulsion copolymer is the acid form and very small particles state. Milky white appearance, low viscosity, good stability at low pH, and insoluble in water. When adding alkali agent is transformed into clear, high-swelling dispersions. Its thickening effect is generated hydroxide in and carboxylic acid. When adding alkali agent almost immediately so that less ionized carboxylic acid changes for the ionization of the carboxylic acid ammonium salt or metal salt form of electrostatic repulsion effects, the results along the copolymer macromolecular chain anionic center, cross-linked copolymer macromolecular chains of rapid expansion and stretch out. Partial dissolution and swelling of the results of the original particles soared many times, the viscosity significantly increased. Cross-linking can not really dissolve into the salt form of the copolymer can be seen as the copolymer dispersion particles increases rapidly. car flags for sale
Two. Alkali dissolved polypropylene thickener which is a cross-linked copolymer emulsion by adding water and alkali, can be quickly transformed into a clear viscous solution. Alkaline swelling of polypropylene thickener, drawing smoothing viscosity, and therefore suitable for use as a mechanical plastic adhesive.
(B) of polyacrylic acid thickener in
More usually bases can be used and polyacrylic acid thickener, such as sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate, high-sodium borate, triethanolamine, diethanolamine, morpholine, alkyl amines. Polyacrylic acid thickener and the viscosity will be a maximum value, and then continue plus alkali make dissociation is suppressed again, the copolymer macromolecular chain contraction, so the viscosity have decreased. car flags for sale
In addition, it should be noted that the polypropylene thickener is very sensitive to the electrolyte, and later by adding ammonium sulfate, sodium chloride and other electrolytes, you can see the phenomenon of viscosity decreases, when used, should give priority to the use of less with electrolytes, dyes or additives. car flags for sale In contrast, with special needs, the viscosity of the polyacrylic acid thickener can be used by adding appropriate amount of electrolyte to adjust.
(C) of polyacrylic acid thickener thixotropy
Polyacrylic acid thickener is a polymer polyelectrolyte, it has a high structural viscosity. The role of mechanical stress, the viscosity will drop its rule is the higher the mechanical stress, the flow gradient the greater the viscosity will be lower. People use the modulation of polyacrylic acid thickener very high initial viscosity of paste, paste by sports scraper (flat screen, rotary screen machine), rollers (roller machine) and the role of mechanical stress, The paste and instantly become thin, so able to adapt to a very fine sieve or drum patterns. Printed in the paste on the fabric, with the disappearance car flags for sale of the mechanical stress, immediately become thick, to restore the initial viscosity. This makes it possible to obtain fine pattern, a clear outline, and printed the results were a good product.
Polyacrylic acid thickener in and dyeing production has been widely used, such as the back of the electrostatic flocking, laminating, bonding of the fiber and fabric glue, paint dyeing and , disperse dyes, car flags for sale, reactive , foam finishing .
The original paste modulation
Alginate paste preparation
Warm water (60 ~ 70 ° C)
Sodium hexametaphosphate 0.5 ~
Soda ash 0.2 ~
Sodium alginate 6 ~
Formaldehyde (40%) 0 ~ l00ml
Warm water into the bucket, add sodium hexametaphosphate and sodium carbonate solution, sodium alginate, slowly pour the car flags for sale warm water under constant stirring (maintaining about
Synthetic Long gum paste preparation