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NBR Rubber Products Plasticizing Effect Is Good

NBR Rubber Products Is one of the most widely used plasticizers in rubber processing. Plasticizing effect is good, rich sources, low cost. Petroleum-based plasticizer is the choice of appropriate crude oil at atmospheric pressure and vacuum distillation in the system. The main varieties are operating oil, third-line oil, transformer oil, oil, light heavy oil, paraffin, petrolatum, NBR Rubber Products asphalt and petroleum resin, the most commonly used is the operating oil.

The operating oil is a high boiling fraction of petroleum and consists of complex hydrocarbon compounds with a molecular weight of 300 to 600 and a wide molecular weight distribution. According to the main components of oil, the operating oil can be divided into the following three:

① aromatic oil: mainly aromatic oil. Brown viscous liquid, NBR Rubber Products the best compatibility with the rubber, processing performance, and absorption speed. Suitable for natural rubber and a variety of synthetic rubber; drawback is contaminated, suitable for dark rubber products.

② naphthenic oil: the main naphthenes. Light yellow or transparent liquid, compatible with rubber than aromatic oil, but the pollution is less than aromatic oil, suitable for NR and a variety of synthetic rubber.

③ paraffin oil: also known as paraffinic oil, NBR Rubber Products mainly linear or branched paraffin. Colorless transparent liquid, low viscosity, poor compatibility with rubber, poor processing performance, slow absorption, and more for saturated rubber, pollution is small or no pollution, should be used for light-colored rubber products.

(1) Operating oil viscosity The higher the viscosity of the operating oil, the more viscous the oil, the oil on the processing performance of the compound and the physical properties of the vulcanizate. The use of low viscosity of the operating oil, good lubrication, NBR Rubber Products cold resistance increased, but in the processing of volatile loss. When the flash point below 180 ℃, the volatile loss is greater, should pay special attention.

The viscosity of the operating oil has a lot to do with the temperature. The viscosity at low temperatures is higher, so the nature of the oil has a great influence on the low temperature performance of the vulcanizate. The use of low viscosity (kinematic viscosity at -18 ° C) at low temperatures allows the low temperature performance of the vulcanizate improve. The viscosity of the high aromatic hydrocarbon oil is more dependent on the temperature than the alkane oil.

The viscosity of the operating oil is related to the heat generation of the vulcanizate, and the rubber product using the high viscosity oil is high. NBR Rubber Products In the case of the same viscosity, the heat of the aromatic oil is low. The tensile strength and elongation increase with the increase of the viscosity of the oil, and the flexural rigidity becomes better, but the tensile stress becomes smaller. The same viscosity of the oil, such as the addition of the same volume, the aromatic oil than the saturated oil can get a higher elongation.

2) Relative density In the petroleum industry, the relative density at 60 ° C is usually measured. The relative density of the rubber processing oil when the rubber product is sold by weight is very important. Typically, the relative density of the aromatic oil is greater than the relative density of the alkane and naphthenic oils. Rubber processing oils are often sold in volume, while in rubber processing they are compounded by weight.

(3) aniline point in the test tube inside the addition of 5 ~ 10ml of aniline, then add the same volume of the sample, and then from the lower part of the heating until a uniform transparent solution, the temperature at this time that the oil aniline point. Aromatic hydrocarbon plasticizer molecular structure and aniline closest to, soluble in which, so the lowest point of the aniline. Aniline point of low oil and diene rubber has a good compatibility, a large number of addition without frosting phenomenon. On the contrary, NBR Rubber Products aniline point of high oil, need to be at high temperatures and raw rubber can be dissolved, so when the temperature is easy to spray the surface. Operating oil aniline point of the level, in essence, is the oil aroma content of the mark. In general, the operation of oil aniline point in the range of 35 ~ 115 ℃ more appropriate.

(4) Pour point (flow point) Pour point is the minimum temperature that can keep flowing and dump. This feature can indicate the suitability of the process temperature of the product.

(5) Flash point refers to the release of sufficient vapor and air to form a mixture under standard test conditions, the ability to ignite the temperature. The flash point of the operating oil is directly related to the vulcanization of the rubber, storage and prevention of fires, NBR Rubber Products as well as the volatility of the operating oil.

(6) neutralization value of the neutralization value is the scale of oil operations, acid energy can cause a significant delay in the speed of rubber vulcanization. The neutralization value can be expressed in milligrams of KOH required to neutralize the acid content of 1 gram of operating oil.