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Method for producing superfine talcum powder by adopting mixed grinding technology

A technology of ultra-fine talc powder and mixed grinding, which is applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc. It can solve the problems of reducing production costs, talc powder structure changes, and poor particle uniformity, so as to improve mechanical properties. , Narrow particle size distribution and low degree of agglomeration

Inactive Publication Date: 2010-10-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 1203124 crushes and grinds talc, then adds grinding aids to make pulp, and performs wet ultra-fine grinding on the pulped material, so that the fineness of talc powder can reach more than -2μm90%. Low production cost can be reduced to a large extent, but the particle size distribution of the superfine talcum powder obtained by this method is relatively wide, and the uniformity of particles is relatively poor.
Chinese patent CN 101497748 mixes talc powder with maleic anhydride additives in a reaction kettle, and then conducts high-temperature treatment at a temperature of 1000-1300°C to obtain superfine functional talc powder. This method requires less investment and lower production costs. And expand the hydrophilic organic area of ​​talcum powder, but because this method has carried out high-temperature treatment to talcum powder, can cause the change of talcum powder structure, thus can affect the further scope of use of talcum powder and application effect
Chinese patent CN 101554604 disperses talcum powder, water and grinding aid on a high-speed disperser to form a concentrated slurry, and then grinds it with water preheated to 40°C in a ball mill, and the product is processed accordingly to obtain a particle size For talcum powder less than 300nm, the ultrafine talc powder obtained by this method has a smaller particle size and achieves a better ultra-fine effect, but it cannot guarantee that the flaky structure of the talc powder will be kept completely, which will affect the quality of the talc powder. Effects in some fields of application

Method used

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  • Method for producing superfine talcum powder by adopting mixed grinding technology
  • Method for producing superfine talcum powder by adopting mixed grinding technology
  • Method for producing superfine talcum powder by adopting mixed grinding technology

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Weigh 40g of talcum powder with a fineness of 1250 mesh, mix it evenly with 800g of zirconia microspheres with a diameter of 0.1-0.2mm, and then add it to the grinding container of the sand mill. The effective volume of the grinding container is 750mL. The linear speed of the sand mill is 4.7m / s, and the dry grinding is carried out, and the grinding time is 30min; then 160g of deionized water is added, and the linear speed of the sand mill is adjusted to 12.6m / s, and the wet grinding is carried out, and the grinding time is 25min. After grinding, the obtained slurry is filtered, spray-dried and air-jet pulverized to obtain an ultrafine talc powder with an average particle size of 367.4 nm.

Embodiment 2

[0025] Weigh 40g of talcum powder with a fineness of 1250 mesh, mix it evenly with 800g of zirconia microspheres with a diameter of 0.1-0.2mm, and then add it to the grinding container of the sand mill. The effective volume of the grinding container is 750mL. The linear speed of the sand mill is 6.3m / s, and the dry grinding is carried out, and the grinding time is 30min; then 160g of deionized water is added, and the linear speed of the sand mill is adjusted to 12.6m / s, and the wet grinding is carried out, and the grinding time is 25min. After the grinding is finished, the obtained slurry is filtered, spray-dried and air-jet pulverized to obtain an ultrafine talc powder with an average particle diameter of 293.2 nm.

Embodiment 3

[0027] Weigh 40g of talcum powder with a fineness of 1250 mesh, mix it evenly with 800g of zirconia microspheres with a diameter of 0.1-0.2mm, and then add it to the grinding container of the sand mill. The effective volume of the grinding container is 750mL. The linear speed of the sand mill is 7.9m / s, and the dry grinding is carried out, and the grinding time is 30min; then 160g of deionized water is added, and the linear speed of the sand mill is adjusted to 12.6m / s, and the wet grinding is carried out, and the grinding time is 25min. After the grinding is finished, the obtained slurry is filtered, spray-dried and air-jet pulverized to obtain an ultrafine talc powder with an average particle diameter of 421.1 nm.

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Abstract

The invention relates to a method for producing superfine talcum powder by adopting a mixed grinding technology, which belongs to the technical field of the preparation of superfine powder. The method comprises the following concrete steps of: (1) adding a high-strength grinding medium into a grinding container of a sand grinder, wherein the filling ratio of the medium is 40 to 80 percent (by volume percent); and then, adding the raw material of talcum powder with the ball-material mass ratio of 10 to 35 and then grinding for a period of time at a certain speed by a dry method; (2) preparing deionized water or water dispersing liquid formed by mixing deionized water and an auxiliary agent; (3) adding the deionized water or the water dispersing liquid containing the auxiliary agent into the grinding container and then grinding for a period of time at a certain speed by a wet method, wherein the mass percentage concentration of slurry is 20 to 50 percent; and (4) carrying out filtration, spray drying and airflow pulverization on the slurry of the ground powder so as to prepare a superfine talcum powder product with different particle size distribution. The superfine talcum powder produced by the invention decreases the particle size, also keeps the laminated structure of talcum more integrally and provides a favorable basis for the application of the talcum powder.

Description

technical field [0001] The invention relates to a method for producing superfine talc powder by adopting mixing and grinding technology, and belongs to the technical field of superfine powder preparation. Background technique [0002] Talc has excellent properties such as good heat resistance, lubrication, acid and alkali resistance, insulation and strong adsorption to oil, and is widely used in papermaking, chemical industry, paint, rubber, plastic and other industrial sectors. With the development of modern industry, higher and higher requirements are put forward for the fineness of talc powder, especially high-quality ultra-fine talc, which has wider and more effective applications and is in short supply in domestic and foreign markets. [0003] As a plastic filler, talcum powder can significantly enhance the mechanical properties of plastics and endow materials with new properties. The significant strengthening effect of talcum powder on plastic products mainly comes fr...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/04C09C3/06
Inventor 施利毅张剑平刘玲玲刘善善张大卫
Owner SHANGHAI UNIV
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