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RUBBER GRADE ZINC OXIDE

RUBBER TIRE INDUSTRY IN THE ORDINARY ZINC OXIDE AND NANO-ZINC OXIDE EXPERIMENTS

Rubber tire industry, the general activity of zinc oxide and zinc oxide nano-comparison experiment
The face of ordinary zinc oxide prices soared there on Monday to help the tire business burdens, Qingdao nakasen zinc&Technology Co., Ltd.  especially with the Qingdao Institute of Chemical Technology Research Institute to complete the activity to promote the use of zinc oxide study. The analysis of research trials are as follows:
I. Comparative test case:
Limited to our test conditions, we can only test the use of contrast, that is, using the same formula and process, only a selection of the general formula of zinc oxide in the specifications of the highest (99.7% zinc), choose another formula oxidation activity zinc 96%, The formulation and testing of the pilot analysis were the following table:
                  Test material formulation and testing of table
 
 
Name of raw      materials
Contrast the basic formula
Physical properties test
Zinc oxide 99.7%
Active Zinc Oxide
Natural Rubber
100.0
100.0
Curing conditions
Item
1420C × 10 minutes
Indicators
Sulfur
2.5
2.5
Zinc oxide 99.7%
Active Zinc Oxide
Ordinary zinc oxide
6.0
—
Hardness (Shao A)
56
53
Active Zinc Oxide
—
4.0
Stretching at 300% strength Mpa
5.5
5.5
Stearic acid
2.0
2.0
Tensile Strength Mpa
27
27
Promote
1.1
1.1
100% elongation at break
640
650
Reinforcing filler
42
42
 
 
 
Antioxidant
2.5
2.5
 
 
Tackifie
2.0
2.0
 
 
Softene
4.0
4.0
 
 
Total
162.1
162.1
 
 
 
From the test results, the two formulations of the physical properties better than the only activity of zinc oxide increases the hardness of the formula is slightly lower, our analysis may be related to reduction of the zinc oxide, reinforcing agents we have an increase of 4 points after a very good test results hardness at 300% corresponding increase in extensor strength is entirely the same as ordinary zinc oxide, and we tread rubber in the activity of zinc oxide used in experiments, the amount of the original 5 were reduced to 3.5 were also made the same effect.
Second, the effect analysis: zinc oxide in the role of rubber compound
1, zinc oxide in rubber compound, the main active agent from (that is, to help promote the agent) role. By adding zinc oxide in rubber with zinc to form promoter complexes containing empty orbit 2n2 + particle polarization ability, easy to promote the cleavage of sulfur ring elements to promote the vulcanization of rubber. Why is used in conjunction with the stearic acid, a result of the processing process, the oxidation
Zinc and rubber molecules are positively charged, same-sex repulsion, difficult dispersion in rubber, when joined together with stearic acid in the mixing process, the generation of zinc stearate on the easily distracted.
2, zinc oxide in rubber is also a good thermal conductivity and heat capacity of agent agent. The thermal conductivity of zinc oxide is 2.5 times that of carbon black, is 5 times rubber; its thermal capacitance is 2 times the carbon black. Why is the inner rubber retread tires (rubber buffer), to fill the holes in the plastic and rubber mat, then a larger amount of zinc oxide? This is because within the plastic in between the tread and the carcass, to fill the holes in the matrix of plastic, plastic pad is located between the inner liner and the carcass. Tire sustained in high-load high-speed driving, the repeated compression, done, Flexibacter deformation, is bound to heat. In order to reduce the heat accumulation of these areas, it must try to make these parts of the plastic heat quickly to a large heat capacity, so the plastic in these areas, zinc oxide are larger. Or a reinforced zinc oxide, a coloring agent.
2, active zinc oxide zinc oxide and the difference between ordinary and features:
Activity of zinc oxide and zinc oxide ordinary differential: ① their different production methods. Zinc oxide ordinary production methods are: the indirect method, the direct method and heating method. For example, commonly used indirect method zinc oxide, it is by the electrolytic zinc ingots by melting, the zinc vapor at high temperatures produced by the oxidation of surface 2Zn + O2 at high temperatures 2zinc oxide, while the activity of zinc oxide is from zinc carbonate decomposition calcination at 400 ℃ was ZnCO3 400 ℃ ZnO + CO2; ② their size and surface area of different sizes, small particle size zinc oxide activity, large surface area, surface area of ordinary zinc oxide for 3-5m2 / g, while the activity of the surface area of zinc oxide of 30 -50 m2 / g, a difference of 10 times.
Activity of the main characteristics of zinc oxide: ① activity, and have a stronger reaction on the curing activation, therefore, can reduce the amount or shorten the curing time; ② the proportion of small, less content of harmful substances (such as Pb, Hg, Ge, Mn, etc.) ; ③ easy activity zinc oxide mixed with rubber, distributed evenly, can increase the viscosity of rubber, so the amount of active zinc oxide zinc oxide less than normal; ④ pressure to improve the shape of the products stability and thermal conductivity.
Third, the conclusion and recommendations
Confirmed by comparing the test:Qingdao Nakasen Zinc&Technology co,.Ltd, zinc oxide production activity is now fully in place of ordinary zinc oxide, the basic quality of its plastic material will not be affected, but also can be good business and social benefits. Zinc oxide is used even if the zinc content of 99.5% of the market price of 12,500 yuan / ton, while the activity of zinc oxide price of 11,000 yuan / ton, a difference of 1,500 yuan / ton, at the same time reduce the amount of increase were 4-6 up at lower prices strong filler, but also a saving.
Zinc oxide to reduce the amount of savings for the state not only the resources of zinc, but also for environmental protection is also very good. Zinc content of the waste will pollute the Great Habitat, the worlds developed countries are examining the tire, with other metal oxides instead of zinc oxide.
Therefore, we think that we should actively promote the use of active zinc oxide, the use of zinc oxide for general around 70-80% better.
                                                                                                 April 3, 2008