Low-true-density kaolin rubber reinforcing filler and preparation method thereof
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A technology of reinforcing filler and high density, applied in the field of rubber filler, can solve the problems of high density and poor reinforcing performance
Active Publication Date: 2022-04-12
内蒙古超牌新材料股份有限公司
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[0004]
The invention provides a low true density kaolin rubber reinforcing filler and a preparation method thereof to solve the technical problems of high density and poor reinforcing performance of existing inorganic mineral rubber fillers
Method used
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[0024] Such as figure 1 As shown, the preparation method of the low true density kaolin rubber reinforcing filler of the present embodiment comprises the following steps:
[0025] Using kaolin as raw material, kaolin is dry crushed to obtain coarse material, which is added with water and alkali metal compound additives for wet ultrafine grinding, and then centrifugally classified to obtain ultrafine slurry. Kaolin less than or equal to 2μm accounts for more than 95%;
[0026] The ultra-fine slurry is spray-dried and depolymerized to obtain fine material particles;
[0027] The fine material particles are mixed with air to obtain suspended matter, and the suspended matter is sprayed into the calcining kiln by jet flow for flash calcination, and the temperature is lowered to obtain low true density kaolin rubber reinforcing filler;
[0028] Kaolin adopts organic matter content of 0.1% to 30%, K 2 O and Na 2 O is kaolin with a total mass content of 0.1% to 1%.
[0029] The p...
Embodiment 1
[0044] Coal-based kaolin 1# is used as raw material, and coal-based kaolin 1# is dry crushed to obtain coarse material. The coarse material is added with water, 1% sodium carbonate and 6% sodium hexametaphosphate for wet ultra-fine grinding, and then centrifuged Superfine slurry is obtained by classification, and the proportion of kaolin less than or equal to 2 μm in the ultrafine slurry is more than 95%;
[0045] The ultra-fine slurry is spray-dried and depolymerized to obtain fine material particles;
[0046] Mix the fine material particles with air to obtain a suspension, and the content of kaolin in the suspension is 5kg / m 3 , the suspension is sprayed into the tubular calcination kiln with a jet flow rate of 20m / s for flash calcination. The temperature of flash calcination is 1000°C, the time is 0.5s, and the temperature is quickly lowered to below 700°C within 10s after mixing with cold air. , to obtain low true density kaolin rubber reinforcing filler.
Embodiment 2
[0048] The difference from Example 1 is that coal series kaolin 2# is used as raw material.
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Abstract
The invention discloses a low-true-density kaolin rubber reinforcing filler and a preparation method thereof, and the preparation method comprises the following steps: taking kaolin as a raw material, carrying out dry crushing on the kaolin to obtain a coarse material, adding water and an alkali metal compound auxiliary agent into the coarse material, carrying out wet ultrafine grinding, then carrying out centrifugal classification to obtain ultrafine slurry, and carrying out vacuum drying on the ultrafine slurry to obtain the low-true-density kaolin rubber reinforcing filler. The proportion of kaolin smaller than or equal to 2 microns in the superfine slurry reaches 95% or above; carrying out spray drying and depolymerization on the superfine slurry to obtain fine material particles; mixing the fine material particles with air to obtain suspended solids, spraying the suspended solids into a calcining kiln in a jet manner for flash calcining, and cooling to obtain the low-true-density kaolin rubber reinforcing filler. The mass content of organic matters in the kaolin is 0.1%-30%, and the total mass content of K2O and Na2O is 0.1%-1%. According to the low-true-density kaolin rubber reinforcing filler, the rubber reinforcing filler with the true density being about 1.9 g/cm < 3 >, the particle size being smaller than or equal to 2 microns and the proportion being 92% or above is obtained through the processes of ultrafine grinding, flash calcining and the like.
Description
technical field [0001] The invention relates to the field of rubber fillers, in particular to a method for preparing low true density kaolin rubber reinforcing fillers. In addition, the present invention also relates to a low true density kaolin rubber reinforcing filler obtained by the above-mentioned preparation method. Background technique [0002] Lightweight rubber filler has a small density, filling it into rubber can play a role in increasing capacity, effectively reducing the overall quality of composite materials, and is widely used in rubber soles, aviation seals, automotive battery potting and marine engineering. At present, the most commonly used fillers in rubber are carbon black and white carbon black, and the true density of carbon black is 1.8-1.85g / cm 3 Between, the true density of white carbon black is 2.1~2.6g / cm 3 . Carbon black and white carbon black have good reinforcing performance and low density, but they also have the problem of high price. Sili...
Claims
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