• Wet Process Active Zinc Oxide

Description : 


The most important usage for zinc oxide is as an activator in rubber industry. However the inorganic Zinc Oxide is not so easily to disperse in organic rubber polymer. How to increase the dispersion on rubber is the most important thing for Zinc Oxide manufactory. The Wet Process Zinc Oxide is one way we consider. In this process, we can make more fine particle size zinc oxide to increase the surface area. The higher surface area of zinc oxide, the easier to disperse in rubber. Here is the comparison of Active Zinc Oxide with French Process Zinc Oxide .


Active Zinc Oxide

French Process Zinc Oxide

True specific gravity

4.8

5.47

Apparent density

0.54

0.6

Surface Area(m2/g)

30-50

3-5

Lead (Pb)%

0.0010

~0.05

pH

8.5-10.0

7.0



As compared with French type zinc oxide, Active zinc oxide is : 


1.       Specific gravity is smaller.

2.       The surface area is much higher, so the crossing linking density is higher.

3.       Harmful impurities are less.

4.       It contains very low lead and create no blacken, the color of vulcanized rubber

          is much clear.

5.       Due to its micro particle size, it is superior in dispersion shortening of vulcanization

          cycle resulting in saving of machine time and power consumption.


ADVANTAGE FOR ACTIVE ZINC OXIDE : 


1.   Active ZnO improves the degree of cross-linking and thus improve the modulus,

      tear resistance and abrasion resistance. It also improves aging properties and gives

      good protection against flex cracking.

2.   With their extremely fine particles, Active ZnO easily disperses thereby facilitating the

      process of latex compounds, thus behaving as a good activator e.g. in teats, gloves,

      balloons and similar articles, it reduces pin holes in latex products and also provide

      shine  / transparency on finished products.

3.   Use of Active ZnO results in good dimensional stability to extruded profiles, tubing

      and open air cured articles in general, the effect particularly pronounced in EPDM

      compounds.

4.   Generally, active Zinc oxide use about 60-80% give desired results. With fine tuning of

      formulation settings, considerable savings can accrue on account of lower inputs such

      as: machine time, power consumption, accelerators and blowing agents etc..., in many

      formulations, thus giving economy and better process controls in ultimate analysis.