1. Calcium-based grease: good water resistance, but poor heat resistance, the maximum operating temperature: 60 ℃. Price: Low. 2, Sodium-based grease: extremely poor water resistance, heat resistance and rust resistance in general, generally used at about 80 ℃, the price is lower. 3, Aluminum-based grease: good rust resistance, poor heat resistance and water resistance, the maximum use temperature of 50 ℃, the price is low. 4, General lithium-based grease: good heat resistance, water resistance, good rust resistance, the maximum operating temperature of 120 ℃, the price is moderate. 5. Extreme pressure lithium-based grease: good heat resistance, water resistance, rust resistance, good extreme pressure performance, the maximum use temperature of 120 ℃, suitable for the lubrication of mechanical equipment and bearings with higher loads. fair price. 6. Molybdenum disulfide extreme-pressure lithium-based grease: good heat resistance, water resistance, rust resistance, good extreme pressure performance, the maximum operating temperature of 120 ℃, suitable for parts with high load or impact load. fair price. 7, Bentonite grease: good heat resistance, good water resistance, poor rust resistance, the maximum use temperature of about 130 ℃, the price is relatively high. 8. Compound calcium-based grease: good heat resistance, water resistance, rust resistance, good mechanical stability (shear resistance), the highest use is about 130 ℃, the price is higher. 9. Extreme pressure composite lithium-based grease: heat resistance, water resistance, rust resistance, mechanical stability, extreme pressure resistance, the highest use at 160 ℃, the price is higher. 10. Polyurea grease: good heat resistance, good oxidation resistance, good water resistance, good extreme pressure, long bearing life, and certain radiation resistance. It is a new type of grease product. There are no national standards or industry standards. The price is high.

The working temperature of the lubricating part is an important basis for selecting grease. The typical component that uses grease is a rolling bearing. As far as the relationship between bearing temperature and grease life is concerned, every 10-15 ° C increase in bearing temperature reduces the grease life by about 1/2. Generally, the temperature of the outer ring of the bearing is about 15 ° C lower than the temperature of the inner ring. The temperature of the bearings working at low and medium speeds (3000-5000r / min) is similar to the temperature of the internal medium. For machine bearings used indoors, such as machine tools, intermittently started motors, hand tools, instruments and precision machinery, the general operating temperature range is 10-50 ° C. For transportation machinery, construction machinery, agricultural machinery and other outdoor working mechanical bearings, the general working temperature changes with changes in atmospheric temperature. Atmospheric temperature changes in most areas of China from -40-40 ° C. Increasing load, accelerating speed, increasing ambient temperature, overfilling grease, and long-term continuous operation all cause the rolling bearing temperature to rise. For example, 240 bearings working at a neck load of 1470N (150kgf) and a speed of 8000r / min can reach a temperature of 40-70 ° C. For wheel bearings of trucks traveling along the avenue, the temperature can reach 40-80 ° C. Large generator bearings can reach temperatures of 89-90 ° C, and rolling bearings such as aircraft landing gear and high-temperature motors can reach 150-200 ° C or higher. Considering the temperature resistance of grease, not only the dropping point of the grease, but also the type of base oil, oxidation resistance, evaporation performance and so on. The maximum temperature of 40-50 ° C should be mineral oil calcium-based grease or lithium-based grease; the maximum temperature of 100-120 ° C should be mineral oil lithium-based grease or mineral oil composite soap-based grease; the maximum temperature of 150 ° C should be mineral oil or synthetic hydrocarbon Lithium-based, aluminum-based or barium-based greases for oils; maximum lithium-based, polyurea, bentonite or amide greases should be selected for ester oils, synthetic hydrocarbons, and alkyl silicone oils at a maximum temperature of 180-200 ° C; maximum temperatures of 250 ° C should be selected Phenyl silicone oil, perfluoropolyether urea-based grease or fluorine-containing grease; the highest temperature of 300 ℃ should be selected from high phenyl silicone oil boron nitride grease or silicone grease. The above is the case of high temperature, and the working temperature of the lubricating part is lower in some cases. Generally, the temperature is below -30 ° C. Synthetic oil grease must be used, especially some miniature bearings for instruments, and the starting torque is small. Special attention should be paid when selecting grease. The minimum temperature li...

When selecting a grease, the purpose of the grease should be clearly defined. According to the role played by grease, grease can be roughly divided into three categories: friction reduction, protection, and sealing. It depends on which part of the grease needs to be applied, which one is the main role of the grease. grease. As antifriction grease, the range of resistance to high and low temperature, the limit of resistance to rotation speed, and the load should be considered. As a protective grease, the metal to be contacted should be taken into consideration, and whether the medium to be contacted is water or chemical gas. In terms of the performance of the grease, the indicators of metal protection, oxidation resistance, water resistance, etc. . As a sealing grease, you should first consider whether the seal material in contact is rubber or plastic, or metal. Especially when rubber and plastic are used as the sealing element, the brand of the rubber must be clarified, and a suitable grease should be selected according to the compatibility of the grease with the rubber. The second is to consider the contact medium, such as water, alcohols, oils. Whether it is a static seal or a dynamic seal. If it is a static seal, you should choose a thicker sealing grease. If it is a dynamic seal, you should choose a grease with a base oil viscosity that is not too large; if the medium is water or alcohol, you should choose a high viscosity paraffin-based base oil. Grease, medium is oil, should use KM-201 grease and other oil-resistant sealing grease.

Our experienced technical staff and engineer's development team can customize and develop your exclusive grease according to your industry needs and special use environment. The following issues will be resolved for you: Grease and its application possibilities, Tailored grease specifications for any industry application, Almost 100 kinds of special greases are provided in various industries, and small quantities can be directly produced in batches. OEM grease advice and service, Safety, environmental and health issues are related to the use of grease. The company has set up a 200-square-meter product development room for R & D personnel to customize and develop products required by customers according to different application scenarios, use environments, industry characteristics and special needs.

The sustainable development strategy of the global economy places more emphasis on the harmonious relationship between "people and nature", which in turn determines that the main direction of future technology research and development in the automotive industry is inseparable from the theme of "safety, environmental protection, and energy conservation." As a supporting material for automobiles, automotive greases can play an important role in the safety, environmental protection and energy saving of automobiles. We must grasp this general direction when developing new automotive grease products. And Jia Dan Kermo also carried out major technical research and development in the automotive grease.     When it comes to safety, the most important thing about grease is reliability. As a component of a mechanical part, it must be reliable in itself. That is to say, it does not deteriorate in the natural environment, it is not easy to deteriorate under the action of temperature, load, medium and machinery or current in the working environment, and it should maintain the performance it should have within the time limit specified in the design of the part, and leave room for it. Just like the safety factor of other mechanical parts. In order to achieve this, at the beginning of new product development, it is necessary to fully analyze and use all the information that can be collected, including text information and physical information, combined with China's resource conditions, carefully design the development route according to the use requirements, and use the required performance tests. Means to screen and evaluate samples. It is worth emphasizing that in addition to physical and chemical performance testing, special attention should be paid to simulated mechanical tests, component tests, bench tests, and road driving tests. The friction and wear lubrication mechanism of any automobile component is extremely complicated, especially for grease lubrication which is mainly in the boundary lubrication condition. These tests are gradually approaching actual use, the more difficult and the higher the cost. Generally, do as much physical and chemical performance testing and simulated mechanical testing as possible, and accumulate the relationship between the two and the bench test before finally performing the road driving test.     As far as environmental protection is concerned, the grease itself should try to use components that do not pollute the environment to avoid pollution to soil and water sources after leakage or discard. The minimum requirements are (or low toxicity) and biodegradable. For example, lead compounds used to increase the extreme pressure and water resistance of greases are potentially toxic to nerves and reproduction, and lead-free components have not been used in lubricating greases since the 1970s. The "green" extreme pressure element that replaces lead is bismuth, which does not cause ecological problems. The le...

There are four main parts of agricultural machinery maintenance: 1. Clutch bearings for agricultural machinery:    In the work, the clutch is used very frequently and easily damaged. The clutch release bearing should be maintained before each season of operation. The main methods of maintenance are to remove the separation claw and the release bearing, and use diesel or kerosene to clean and dry. After that, install the grease and put it back on. 2, coulter shaft     Bearing The right side bearing of the coulter shaft supporting the tractor is the same as the coulter gearbox. It is lubricated with gear oil. It is easy to ignore that the left side bearing should be greased. If it is not used, the bearing will run out of oil and dry up. The heat got stuck during the operation, and even caused the bearings to run inward, and the shaft journal was severely damaged and scrapped. Therefore, during maintenance, the bearing on the left side of the coulter shaft should be removed, and after cleaning, regularly add grease. 3. Shaft sleeve of harrow shaft     The working environment of the shaft sleeve of the harrow shaft is very harsh, dust and moisture are mixed, and it is very easy to cause wear or necrosis. During maintenance, the impurities in the shaft sleeve should be cleaned before adding grease. If the shaft sleeve is severely worn, it should be replaced with a new shaft sleeve. 4. Thresher roller bearings     The working environment of the threshing machine roller bearings is also very bad. There is a lot of dust and humidity. The maintenance work cannot be ignored. The roller journal will be worn, and the roller will be scrapped after serious. Before and during the operation, you should pay attention to checking the bearings. If you find that the grease becomes less or dry, refill the grease in time, and the bearing should be replaced in time when it is overloaded.