(A) concentration with the concentration of latex and dry rubber content of total solid content, said. Mean dry rubber content of dry rubber content of latex, rubber latex refers to the total solid content of water and volatile components removed after all the solid material content, expressed as a percentage. Total solid content of dry rubber content generally have a difference, this value is called the Director-General is poor, to show that non-latex rubber components are not volatile content. These indicators for guiding production and product quality are important. Concentration of fresh latex with age, season, tapping systems differ, generally only 20% -40% of the total solid content.
(B) relative density relative density of fresh latex between about 0.96-0.98, which is the relative density of the whey (1.02) and the relative density of rubber hydrocarbon (0.9064) determined the relative density can be approximated from the measured latex rubber hydrocarbon content. The higher content of hydrocarbon rubber, latex the greater the relative density of small, as shown in the table.
(C) the viscosity of the total solid content of about 35% of the fresh latex of its viscosity is about 12-15mPa · s, with the acquisition period and other factors have significantly changed. The total solid content were generally high viscosity high, but the same total solid content of latex, as preservation methods, storage time, the different particle size, viscosity differences will occur.
(D) the size of the surface tension surface tension that latex evenly distributed in the surface properties of solid performance is good or bad --- the so-called wet. Rubber is insoluble in water, but contains a lot of latex can reduce the surface tension of water, surfactant, such as protein, fatty acids, they can reduce the surface tension of latex. If the total solid content of 38% to 40% of the latex, the surface tension of about 38 ~ 40mN / m, much higher than water (72Mn / m) is low, so the hydrophilic surface such as cloth, leather wet and soak capability can often have decreased with the increase of surface tension, taken in rubber latex production still can not meet the technical requirements, the needs and adding some surfactant to further improve the surface properties and increase wetting.
(E) PH value PH value of latex has a great influence on its stability. Fresh latex was neutral, slightly alkaline tendencies, PH value is 7 ~ 7.2. After a few hours to more than 10 hours, due to latex in the bacteria and enzymes, PH value is reduced and becomes acidic, resulting in solidification. To this end, often by adding ammonia or other base, so that PH value to 10 to 10.5 in order to be able to preserve a long time.
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