A kind of preparation method of composite nano-calcium carbonate for rubber
A technology of nano-calcium carbonate and calcium carbonate, which is applied in the field of nano-material preparation, can solve the problems of increasing the production cost of rubber and high cost of silica, and achieve the effects of low production cost, increased coating rate, and improved dispersion degree
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Embodiment 1
[0030] The present embodiment provides a kind of preparation method of composite nanometer calcium carbonate for rubber, specifically comprises the following steps:
[0031] Step a, prepare the calcium carbonate slurry containing 7%wt nanometer calcium carbonate;
[0032] Step b, start the heating, stirring and ultrasonic pulverization of the calcium carbonate slurry, and pass carbon dioxide into the calcium carbonate slurry and add sodium silicate solution at 30°C while maintaining 10rpm stirring and 25KHz ultrasonic conditions The concentration of sodium silicate in the sodium silicate solution is 0.10mol / L, and the volume of the sodium silicate solution is 15% of the volume of the calcium carbonate slurry;
[0033] Step c, when the pH reaches 7, continue feeding carbon dioxide for 3 minutes, stop stirring, ultrasonication and feeding of carbon dioxide, and leave to age at 30°C for 50 minutes;
[0034] Step d, dehydration by suction filtration, and drying at 105°C until the...
Embodiment 2
[0037] The present embodiment provides a kind of preparation method of composite nanometer calcium carbonate for rubber, specifically comprises the following steps:
[0038] Step a, prepare the calcium carbonate slurry containing 10%wt nanometer calcium carbonate;
[0039] Step b, start the heating, stirring and ultrasonic pulverization of the calcium carbonate slurry, and pass carbon dioxide into the calcium carbonate slurry and add sodium silicate solution at 60°C while maintaining 30rpm stirring and 30KHz ultrasonic conditions ; The concentration of sodium silicate in the sodium silicate solution is 0.20mol / L, and the volume of the sodium silicate solution is 20% of the volume of the calcium carbonate slurry;
[0040] Step c, when the pH reaches 7.5, continue to feed carbon dioxide for 5 minutes, stop stirring, ultrasonication and carbon dioxide feeding, and leave to age at 60°C for 60 minutes;
[0041] Step d, dehydration by suction filtration, and drying at 110°C until t...
Embodiment 3
[0044] The present embodiment provides a kind of preparation method of composite nanometer calcium carbonate for rubber, specifically comprises the following steps:
[0045] Step a, prepare the calcium carbonate slurry containing 15%wt nano-calcium carbonate;
[0046] Step b, start the heating, stirring and ultrasonic pulverization of the calcium carbonate slurry, and pass carbon dioxide into the calcium carbonate slurry and add sodium silicate solution at 80°C while maintaining 50rpm stirring and 30KHz ultrasonic conditions ; The concentration of sodium silicate in the sodium silicate solution is 0.20mol / L, and the volume of the sodium silicate solution is 25% of the volume of the calcium carbonate slurry;
[0047]Step c, when the pH reaches 7.5, continue to feed carbon dioxide for 8 minutes, stop stirring, ultrasonication and carbon dioxide feeding, and stand at 80°C for 90 minutes;
[0048] Step d, dehydration by suction filtration, drying at 115°C until the difference in ...
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