Xiaobian learned from the State Intellectual Property Office that the invention patent application of Guangxi Hezhou Kelong powder Co., Ltd. "a production method of heavy calcium carbonate" was announced on June 11.

Guangxi Hezhou Kelong powder Co., Ltd., established in 1997, is a private high-tech enterprise integrating mining, superfine powder processing and new material research and development. It is the backbone production enterprise of heavy calcium carbonate in China.

Cologne powder has a large-scale calcium carbonate raw material mine, with more than 70 production lines including centralized raw material crushing station, 10000 ton homogenization station, ball mill, vertical mill, ring roller mill and continuous surface treatment equipment, specializing in the production of various specifications of heavy calcium carbonate products, with an annual output of more than 2 million tons. The products are widely used in artificial stone, rubber, plastic, paper, coating, ink, building materials and daily chemical industry.

It is reported that in the grinding process of the heavy calcium carbonate production method of this invention, the specific starting sequence is as follows: first turn on the classifier, increase speed to 100-300 rpm, then turn on the fan, increase speed to 100-300 rpm, finally turn on the host, increase speed to 100-300 rpm; Increase the rotating speed alternately according to 100-300 revolutions each time until the constant speed is reached; The specific shutdown sequence is as follows: first reduce the speed of the main engine by 100-300 rpm, then the speed of the fan by 100-300 rpm, and finally the speed of the classifier by 100-300 rpm; That is to say, reduce the speed alternately by 100-300 turns each time until it stops. This method adopts the way of increasing and decreasing speed step by step to increase and decrease the speed of the classifier and the main engine in turn, which can effectively avoid the generation of coarse particles, so as to solve the dust problem without producing coarse particles, and realize accurate control through automatic control.

In addition, since June, the invention patent application of Cologne powder "a continuous atomization modification device and its modification process of heavy calcium carbonate for silicone rubber" and "a composite modifier and its application method that can improve the activity of heavy calcium carbonate for silicone rubber" have been published.

The invention relates to a continuous atomization modification device of heavy calcium carbonate for silicone rubber and a modification process thereof, which comprises a primary mixing chamber and a post mixing chamber; A second powder jetting head is arranged under the first powder jetting head, and a first collision zone T1 is formed above the second powder jetting head; The lower part of the primary mixing cavity is a funnel structure, forming a first mixing area M1; The upper part of the rear mixing cavity is a bell mouth structure with narrow upper part and wide lower part, and a modifier atomizing head is arranged at the lower center of the bell mouth structure, and the upper part of the modifier atomizing head forms a second collision zone T2; The lower part of the rear mixing cavity is a funnel structure and forms a second mixing area m2; The lower part of the primary mixing cavity is communicated with the upper part of the post mixing cavity; The lower end of the rear mixing cavity is a feeding port. The invention realizes the beneficial effects of uniform powder coating, good modification activation effect and stable modified product quality.

A composite modifier which can improve the activity of heavy calcium carbonate for silicone rubber includes silane coupling agent, titanate coupling agent, aluminate coupling agent, stearic acid, poss phosphorylated vegetable oil polymer. The invention also discloses a method for using the composite modifier which can improve the activity of heavy calcium carbonate for silicone rubber according to the claim, including the following steps: first, add poss phosphorylated vegetable oil polymer into the powder, after 1-5 minutes of reaction, add silane coupling agent, titanate coupling agent and aluminate coupling agent, after 3-5 minutes of reaction, add stearic acid, The reaction continued for 1-10 minutes. The composite modifier of the invention is used to modify the heavy calcium carbonate used for silicone rubber, which has good dispersion, high activity, high whiteness and low oil absorption value, and can effectively improve the thixotropy and tensile strength of silicone rubber.