Preparation method of high-transparency and high-dispersity white carbon black
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A high-dispersity, silica technology, used in chemical instruments and methods, silicates, inorganic chemistry, etc., can solve problems such as decreased dispersibility, and achieve improved reinforcement performance, inhibition of sedimentation, and narrow particle size distribution. Effect
Inactive Publication Date: 2020-08-07
FUJIAN ZHENGSHENG INORGANIC MATERIAL
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[0004] Patent CN102229758B discloses "a preparation method of highly dispersed white carbon black", which is mainly to carry out the synthesis reaction in two steps, first synthesize fine silica seeds, and then carry out modification treatment, the modification treatment is on the organic surface Precipitation reaction under the action of activator SDS and composite silane coupling agent, and then surface coating and modification of particles, washing and drying to obtain high-dispersion precipitated silica for high-performance tires; although this method has undergone surface treatment , but the decrease in dispersion due to self-aggregation of primary particles is the drawback of this process
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Embodiment 1
[0029] The preparation method of highly transparent and highly dispersible white carbon black of the present invention operates according to the following steps:
[0030] A. Using in-situ synthesis of magnesium aluminum silicate dispersion inducer:
[0031] A1. Add 5.0L of water to a 50.0L reaction kettle, add 12.0L of sodium silicate under stirring conditions and pass in steam to raise the temperature to 60°C, and gradually add magnesium sulfate aqueous solution under vigorous stirring; the modulus of the sodium silicate 2.5, the feeding time of the magnesium sulfate aqueous solution is 30min, the mass fraction of the magnesium sulfate aqueous solution is 20.0%, the addition of the magnesium sulfate aqueous solution is 5.0L, and the reaction forms the bottom liquid slurry containing magnesium and silicon;
[0032] A2. Add aluminum sulfate aqueous solution to the above-mentioned slurry, dropwise within 1.0h, adjust the slurry to pH=14 with sodium hydroxide solution, continue t...
Embodiment 2
[0040] The reaction temperature in step B1 is 85° C., and other steps and parameters are the same as in Example 1.
Embodiment 3
[0042] Step B1 magnesium aluminum silicate suspension 1000mL, other steps and parameters are the same as in Example 1.
[0043] Table 1 shows the comparative analysis of the comprehensive chemical performance indicators of the high transparency and high dispersibility silica products obtained in the above three examples compared with ordinary silica.
[0044] Table 1 Comparison of comprehensive chemical indicators of each product
[0045] technical indicators Example 1 Example 2 Example 3 Ordinary silica transparency,% 96 96 96 90 Dispersion coefficient WK(S) 0.8 0.8 0.7 1.7 BET, m 2 / g
[0046] As can be seen from Table 1, the transparency of the silica products prepared by the three embodiments of the preparation method of highly transparent...
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Abstract
The invention discloses a preparation method of high-transparency and high-dispersity white carbon black. The method comprises the following operating steps: 1, synthesizing a magnesium aluminum silicate dispersion inducer: sequentially adding water and silicate into a reaction kettle while stirring, heating to 60-80 DEG C, adding a magnesium compound solution while violently stirring, and reacting to form magnesium / silicon-containing base solution slurry; dropwise adding an aluminum compound aqueous solution, adjusting the pH value of the slurry to 10-14 by using a saturated alkali solution,and continuously reacting to obtain a dispersion inducer magnesium aluminum silicate suspension; and 2, synthesizing a high-transparency and high-dispersity white carbon black covering layer by usingthe magnesium aluminum silicate dispersion inducer: adding the magnesium aluminum silicate suspension and bottom water into the reaction kettle, adding silicate, stirring and heating to 75-95 DEG C toenable the pH value of the base solution to be 8-10, adding silicate and an acidifying agent at the same time to maintain the pH value at 8-10, stopping adding the silicate, and continuing adding theacidifying agent until the pH value is 3.5-5.0 to obtain slurry of the high-transparency and high-dispersity high-white carbon black; and filtering, washing, drying and briquetting to obtain the granular high-transparency high-dispersity white carbon black product.
Description
technical field [0001] The invention relates to a preparation method of an inorganic powder material, in particular to a preparation method of highly transparent and highly dispersible white carbon black. Background technique [0002] Precipitated hydrated silica, also known as white carbon black, is a non-toxic, odorless and non-polluting non-metallic material. As an important chemical raw material, silica is widely used in various fields such as rubber, silicone rubber, paint, coating and advanced daily cosmetics. Highly dispersed silica is different from conventional white carbon black because it has some special properties, so it has high value-added applications. In the application of rubber, because silica has too many micropores, after adding rubber, on the one hand, silica cannot be well dispersed in the rubber polymer structure, which further leads to poor processing performance and high heat generation; on the other hand On the one hand, the micropores will absor...
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