Source lei tell you | what are the surface modification methods of talcum powder?
The mechanism of surface modification of talcum powder is to use some small molecules or polymer compounds with amphiphilic groups to modify the surface of one or two of the composite substances, so that the surface is changed from hydrophobic to hydrophilic, in order to make the two substances better combined.
(1) Surface cover modification method
The surface coating modification method is to cover the surface of the particles with surfactant or coupling agent, so that the surfactant or coupling agent is combined with the surface of the particles by adsorption or chemical bond, so that the surface of the particles is changed from hydrophilic to hydrophobic, and the particles are given new properties, so that the compatibility between the particles and the polymer is improved.
In view of the disadvantage that the affinity between talc and polymer is not high, the surfactant with amphoteric groups is covered on the particles, the hydrophilic groups are oriented to the surface of the particles, and the lipophilic groups are oriented to the outside, so that when combined with the polymer, there is good compatibility, the purpose of modification is achieved, and the application range of talc is expanded.
(2) Mechanochemical method
Mechanochemical method is to make larger particles smaller by crushing, friction and other methods, so that the surface activity of the particles becomes larger, that is, to enhance its surface adsorption capacity, simplify the process while also reducing costs, and make it easier to control the quality of the product. Ultrafine grinding is an important means of material deep processing, its main purpose is to provide high-performance powder products for modern industry. This process is not a simple material particle size reduction, it contains many complex powder material properties and structural changes, mechanical and chemical changes.
After superfine grinding of talc by stirring mill, the surface activity is enhanced, the thermal effect is improved, and the whiteness is increased. The change of powder performance is closely related to the thermodynamic characteristics of the superfine grinding process.
(3) Outer film modification method
The modification of the outer film layer is to coat a layer of polymer uniformly on the surface of the particle, thus giving the particle surface new properties.
(4) Local active modification
The local active modification uses chemical reaction to graft some groups or functional groups compatible with the polymer on the surface of the particles, so that the inorganic particles and the polymer have better compatibility, so as to achieve the purpose of inorganic particles and polymer composite.
(5) high energy surface modification
High-energy surface modification is the use of high-energy discharge, plasma rays, ultraviolet rays and other huge energy generated by the surface modification of particles, so that its surface has activity, improve the compatibility of particles and polymers.
(6) Precipitation reaction modification
Precipitation Reaction Modification The modification was performed using a precipitation reaction. This method is the use of precipitation effect on the surface of the particles coated, so as to achieve the effect of modification.
Method, surface, particle, modification, polymer, utilization, group, talc, compatibility, purpose
The difference between barium sulfate（BaSO4） and barium sulfite（BaSO3）
Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.