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A production method and white carbon black technology, applied in the direction of silica, silicon oxide, etc., can solve problems such as unfavorable processing, large specific surface area, and easy heating
Inactive Publication Date: 2018-02-23
通化双龙化工股份有限公司
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The existing production method of precipitation white carbon black generally uses liquid water glass and concentrated sulfuric acid as raw materials, and is prepared through precipitation reaction, press filtration, pulping, and spray drying. The pH value of ordinary white carbon black is generally controlled at 5-7. The acidic silica on the surface will release hydrogen ions, neutralize the alkaline accelerator, and affect the vulcanization speed, and the specific surface area of ordinary silica is large, and it is slow to eat powder when mixing rubber, and it is easy to generate heat and has a high viscosity. , and other shortcomings, which are not conducive to processing
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Embodiment 1
[0018] The specific operation steps of the production method of alkaline white carbon black are as follows:
[0019] 1. Refined water glass
[0020] Take 40m³ of water glass dissolved by steam, configure it into water glass with a specific gravity of 1.080-1.085g / cm³, filter it through a plate and frame, and take the clear liquid for later use.
[0021] 2. Synthesis of silica
[0022] Add 11m³ of base material into a 55m³ reactor, add sodium sulfate of the same quality at the same time, pass in steam to raise the temperature, start stirring when the temperature rises to 50 degrees, continue to heat up, start adding sulfuric acid dropwise when the temperature reaches 87 degrees, sulfuric acid per hour Add 0.15m³ dropwise, react until the pH value is between 10-11, start the second stage reaction, add water glass and sulfuric acid dropwise at the same time, add 19m³ of water glass dropwise per hour, add 0.42m³ of sulfuric acid dropwise per hour, and react until the pH value is ...
Embodiment 2
[0030] The specific operation steps of the production method of alkaline white carbon black are as follows:
[0031] 1. Refined water glass
[0032] Take 50m³ of water glass dissolved by steam, configure it into water glass with a specific gravity of 1.085-1.090g / cm³, filter it through a plate and frame, and take the clear liquid for later use.
[0033] 2. Synthesis of silica
[0034] Add 13m³ of base material into a 55m³ reactor, add sodium sulfate of the same quality at the same time, pass in steam to raise the temperature, start stirring when the temperature rises to 45°C, continue to heat up, start adding sulfuric acid dropwise when the temperature reaches 88°C, sulfuric acid per hour Add 0.16m³ dropwise, react until the pH value is between 10-11, start the second stage reaction, add water glass and sulfuric acid dropwise at the same time, add 17m³ of water glass dropwise per hour, add 0.37m³ of sulfuric acid dropwise per hour, and react until the pH value is 10 Stop dri...
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Abstract
The invention relates to a production method of an inorganic powder material and in particular relates to a production method of alkaline silica. The production method comprises the following operation steps: (1) refining a water glass solution; (2) carrying out a synthetic reaction on precipitated silica; (3) carrying out filter pressing and washing on reaction slurry; (4) slurrying: conveying afilter cake to a beating tank by a belt conveyer, and carrying out slurrying in two stirring modes including a high-speed stirring mode and low-speed stirring mode to provide uniform slurry for spraydrying; and (5) drying process: after drying the slurry by a spray drying tower, carrying out pulverization by using a mechanical pulverizer until the particle size is smaller than 15mu m, and carrying out packaging and storage after carrying out collection by using a bag pulse deduster. By improving a traditional precipitation production process of silica and adopting a way of optimizing processparameters and optimally selecting an adjuvant in the production process disclosed by the invention, the pH value of a product ranges from 7.5 to 11, and the specific surface area ranges from 50m<2>/gto 110m<2>/g, so that an application of the product to special rubber is guaranteed.
Description
technical field [0001] The invention relates to a production method of an inorganic powder material, in particular to a production method of alkaline white carbon black. Background technique [0002] In the prior art, precipitated white carbon black is a widely used inorganic functional powder material, which is mainly used in the fields of ordinary rubber, silicone rubber, paint, ink, pesticide, papermaking and the like. The production method of silica for high elastic silicone rubber is mainly precipitation method. The existing production method of precipitation white carbon black generally uses liquid water glass and concentrated sulfuric acid as raw materials, and is prepared through precipitation reaction, press filtration, pulping, and spray drying. The pH value of ordinary white carbon black is generally controlled at 5-7. The acidic silica on the surface will release hydrogen ions, neutralize the alkaline accelerator, and affect the vulcanization speed, and the spec...
Claims
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