Silica powder bag plastic machine products industrialized production since the 1940 s, with more than 60 years of continuous development and improvement, has been widely used in all walks of life, in addition to the widely used as a reinforcing agent in rubber products, can also be used for the pharmaceutical industry, agricultural chemicals, printing ink, paint, coatings, toothpaste, paper, food, feed, cosmetics, batteries and other industries. Now the main application industries of white gray black are briefly introduced:
1. Tire industry
At the beginning, silica Z was only used as decorative rubber strip in white tire side car tires. Later, its use gradually expanded, and now it has been used in various parts of tires. In general, when the lag loss of tread glue is reduced, the wet grip is also reduced. However, in the tire tread compound with white carbon black, especially high dispersion and coupling agent of precipitated silica and tire life can be improved by (improve abrasion resistance) and security (improve the wet resistance), reduce fuel consumption, lower rolling resistance, therefore, at present, a lot of foreign tire manufacturers in the tread and high dispersion white carbon black, can effectively improve the tire performance. In addition, the precipitation method of silica used in tire body and belt layer, can improve the adhesive force between rubber material and steel cord (such as between nail white system); Using white carbon black to partially replace carbon black in tire side glue can greatly improve the durability of rubber material, improve the flexure resistance and impact resistance, used in car and truck tire packaging cloth can maintain the dimensional stability of rubber material, and improve its ability to resist mechanical damage.
(1) tread
Tread is the part of the tire in contact with the road, so it puts forward three basic requirements: one is to have a higher wet road grasp or better traction, to ensure the safety of vehicles and personnel; Second, the rolling resistance is small to save fuel. Generally speaking, a 3-4% reduction in tire rolling resistance can reduce fuel consumption by 1%. Since the rolling resistance of tread is about 50% of the tire, reducing the rolling resistance is an important way to save fuel. Three is wear resistance, long service life.
A. passenger tire tread
It has been found that the combination of highly dispersible silica with special solution polymers and silane coupling agent, combined with the best mixing process, can overcome the defects of the lag loss of tread glue and the wet grip force. A tread glue made entirely of silica as a filler can reduce rolling resistance by 20%, which means tread lag loss is reduced by about 50% and fuel consumption is reduced by at least 30%.
At present, the amount of precipitated silica in the tread of passenger tires is generally 65.
B. Tread of load truck
White carbon black is used in heavy duty tires to improve the puncture resistance and tear resistance of tread. Precipitated silica is especially suitable for its tread, because it can not only reduce rolling resistance, but also low driving temperature. Low running temperature or low heat generation is extremely important for heavy duty tires.
C. cross-country tire tread
The purpose of precipitation silica used in off-road tire tread is to reduce its heat generation, improve the ability of heat resistance and resistance to collapse, compared with the off-road tire tread containing precipitation silica and pure carbon black filled tread, the cutting resistance growth and tear strength of the former is greatly improved than the latter. All the tread of natural rubber engineering machinery tires with high dispersive precipitation method of white carbon black can obtain the effect of low heat generation, better tear resistance and fatigue tear resistance of pattern block.
(2) tire side
The tire side is a layer of outer rubber to protect the tire body from climate erosion, it should have good resistance, resistance to oxygen aging, wear resistance, tear resistance, resistance to circumferential and radial cracking, long fatigue life and so on. To this end, the tire sidewall is generally used with natural rubber/polybutadiene rubber and some rubber materials containing anti-aging agent, anti-ozone agent and paraffin. But after the consumption of antiaging agent, the tire side will become hard and crack; Anti-ozone agent and paraffin wax will make it fade, and anti-ozone agent has pollution, at this time if the precipitation method of white carbon black, can make the above phenomenon significantly weakened.
(3) steel cord bonding
Precipitated silica is widely used for hanging glue of steel wire. It can not only be used with resorcinol formaldehyde tree tire to form RFS bonding system, increase the bonding between coated steel wire and rubber, but also can be used with organic drilling salt to form silica/cobalt and silica/resin/cobalt bonding system. The two bonding systems are in heat. The adhesive strength of moisture and brine before and after aging increases with the increase of silica content.
To sum up, white carbon black has been more and more widely used in tires. Various tires represented by "green tires" are more and more favored by white carbon black. Therefore, the development of more improved white carbon black and tire performance will be an important link.
