(4) Filling oil composition
The effect on the performance of oil-filled rubber varies depending on the composition of the oil. Filling oils are generally refined naphthenic oils and aromatic hydrocarbon oils. Among them, aromatic hydrocarbon oils are classified into two grades of medium aromatic oil and high aromatic oil according to the content of aromatic hydrocarbons. For example, for styrene-butadiene rubber, the high aromatic oil is filled, the compatibility of the glue and the oil is the best, and the processing property is also the best, but the aging resistance and the cold resistance are inferior. The amount of oil-filled is also a key indicator. Generally, 37.5 parts are taken, because less (such as 25) is afraid of failing to meet the requirements, and high (such as 50) is afraid of affecting performance.
(5) Variety and brand
In oil-filled rubber, different varieties and grades indicate different rubber types, different oils and different oil-filling amounts.
1 Oil-filled styrene-butadiene rubber (OESBR) takes SBR1712 as an example, SBR stands for styrene-butadiene rubber, 17 in 1712 stands for oil-filled series, and 12 stands for 37.5 parts of high aromatic oil, which is polluting. SBR1703 is also oil-filled styrene butadiene rubber, but it is filled with 37.5 parts of naphthenic oil, which is non-polluting.
2 Oil-filled butadiene rubber (OEBR) The main purpose of developing oil-filled butadiene rubber is to improve its wet skid resistance and reduce its cost without compromising other properties. Aromatic or naphthenic oils with low volatility, high flash point, and low freezing point (to meet the requirements of resistance to slip and snow and ice) are generally used. Currently mainly used for anti-slip, anti-snow mud tires.
3 The oil-filled natural rubber (OENR) production method is divided into dry and wet. Dry oil filling is done by the rubber factory itself, that is, the mineral oil is heated to 900 ° C, and evenly mixed with the granulated natural rubber on the rubber mixer. In the wet method, the emulsified mineral oil is added to the natural latex, and after sufficient stirring, the acid is added to adjust the pH to about 5, which is obtained by solidification and drying. Wet process oil filling is generally carried out in natural rubber production plants. The process of oil-filled natural rubber is superior to ordinary natural rubber and has good wet skid resistance. It is suitable for tires running below -40 °C in winter. In addition, it has excellent stab resistance and tear resistance.