Test Method for Silica
Many people may wonder how the aging resistance, wear resistance, high and low temperature resistance, acid and alkaline resistance, insulation and other characteristics of rubber products are obtained? This is to start with the reinforcing agent in the rubber additive, which is different from the filler used to improve the volume of rubber and reduce the cost of raw materials. The reinforcing agent plays a reinforcing role in the mechanical properties and aging resistance of rubber. So the tonic is like all kinds of magic potions in Harry Potter. After drinking it, you can get the super power of becoming others or shrinking.
There is a general in the reinforcing agent of colored rubber products, whose name is white carbon black. As the name implies, white carbon black is a white powder, granular or massive substance. Its main component is silica, so its two products are named precipitated hydrated silica (precipitated silica) and fumed silica (fumed silica).
These two kinds of silica are not suitable. Precipitated silica can be used to make tires, rubber shoes, rubber tubes, tapes, heat-resistant gaskets, medical supplies and other various colored or white rubber products. Fumed silica is mainly used to make silicone rubber. In addition, it is also the main reinforcing agent for V-belt, rubber roller, rubber tube, cable, oil seal and foaming products.
White carbon black is widely used in rubber products. How can we improve the production efficiency and control accuracy of white carbon black through inspection, so as to save energy, ensure the quality and production stability of products, and improve the market competitiveness of products? This naturally requires us to fully grasp the test standard of white carbon black and knock on the test items of white carbon black.
1、 White carbon black testing project
1). Test items of precipitated silica (precipitated silica hydrate)
The chemical formula of precipitated silica is SiO2 · nH2O. The test items of precipitated silica mainly include silica content, color, 45 μ m sieve residue, heating reduction, burning reduction, pH value, total copper content, total manganese content, total iron content, dibutyl phthalate absorption value, water-soluble matter, 300% constant elongation stress, 500% constant elongation stress, tensile strength, elongation at break, physical form, dispersion, specific surface area and other indicators.
2). Test items of high dispersion precipitated silica (high dispersion precipitated hydrated silica)
The test items of high dispersion precipitated silica are basically the same as those of ordinary precipitated silica, but the test items of technical indexes and typical values are added. Therefore, the technical specifications of high dispersion precipitated silica still need to detect the two indexes, i.e. median particle size and particle proportion. The typical value requires to test the total surface area, CTAB adsorption specific surface area and dispersion.
3). Test items of fumed silica (fumed silica)
The appearance of fumed silica is required to be fluffy white powder. The specific test items mainly include specific surface area of nitrogen adsorption, loss on ignition, silicon dioxide content, aluminum oxide content, titanium dioxide content, iron oxide content, carbon content, chloride content, pH value of suspension, volatile matter at 105 ℃, vibrating density, 45 μ m sieve residue and other indicators.
2、 White carbon black test standard
1). The testing standards of silica products mainly include:
Fumed silica (GB / T 20020-2013)
GB / T 32678-2016 rubber compounding agent highly dispersed precipitated hydrated silica
Hg / T 3061-2009 rubber compounding agent precipitated hydrated silica
2). The national standard of silica for rubber mainly includes:
GB / T 23656-2016 rubber compounding agents Determination of specific surface area of precipitated hydrated silica CTAB method
GB / T 28600-2012 rubber compounding agents Determination of average pore size of precipitated hydrated silica
GB/T 28601-2012 determination of gel content of precipitated hydrated silica by rubber compounding agent
GB / T 32698-2016 rubber compounding agents - Determination of particle size distribution of precipitated hydrated silica - laser diffraction method
GB / T 34698-2017 rubber compounding agents Determination of water soluble matter content of precipitated hydrated silica conductivity method
GB / T 36764-2018 rubber compounding agent precipitated hydrated silica inductively coupled plasma atomic emission spectrometric determination of heavy metal content
3. The industrial standards of silica test methods for rubber mainly include:
Identification of precipitated hydrated silica in styrene butadiene rubber (Hg / T 2404-2008)
Hg / T 3062-2008 rubber compounding agent - Determination of silica content in precipitated hydrated silica dry samples
Hg / T 3063-2008 comparison of color of precipitated hydrated silica in rubber compounding agent
Hg / T 3064-2008 rubber compounding agent Determination of precipitated hydrated silica 45 μ m sieve residue
Hg / T 3065-2008 rubber compounding agent Determination of heating loss of precipitated hydrated silica
Hg / T 3066-2008 rubber compounding agent - Determination of ignition loss of precipitated hydrated silica dry sample
Hg / T 3067-2008 rubber compounding agent Determination of pH value of precipitated hydrated silica water suspension
Hg / T 3068-2008 rubber compounding agent Determination of total copper content of precipitated hydrated silica
Hg / T 3069-2008 rubber compounding agent Determination of total manganese content of precipitated hydrated silica
Hg / T 3070-2008 rubber compounding agent Determination of total iron content of precipitated hydrated silica
Hg / T 3071-2008 rubber compounding agent Determination of refractive index of precipitated hydrated silica
Hg / T 3072-2008 rubber compounding agent Determination of absorption value of precipitated hydrated silica dibutyl phthalate (DBP)
Hg / T 3073-1999 rubber compounding agent Determination of specific surface area of precipitated hydrated silica nitrogen adsorption method
Hg / T 3748-2014 rubber compounding agents Determination of water soluble matter content of precipitated hydrated silica cold extraction method