Surface modification is to change the physical and chemical properties of powder materials according to the application needs, so as to meet the needs of modern new materials, new processes and new technology development. It has been paid more and more attention in the process of powder processing and application.
Calcium carbonate
Surface modification is an important processing technology to improve the application performance, applicability, market expansion and consumption of calcium carbonate. At present, there are five major methods: inorganic surface treatment, organic surface modification, polymer surface modification, mechanochemical modification and high-energy surface modification. (click to see: 5 surface modification methods of calcium carbonate)
quartz
In order to make the surface of silica powder, silica powder and other forms of silica powder for plastics, rubber and other resins compatible with polymer matrix, and improve the comprehensive properties and processability of filler materials, surface modification must be carried out, among which the most popular method is surface chemical modification. (click to view: a paper about chemical modification of quartz surface)
kaolin
The main modification method of kaolin is surface chemical modification. The commonly used surface modifiers are silane coupling agent, silicone (oil) or silicone resin, surfactant and organic acid. (click to view: common surface modifiers and selection principles of kaolin)
talc
The surface modification of talc powder can improve the interface affinity between talc powder and polymer, and improve the dispersion state of talc powder filler in polymer base material. In this way, talc powder not only plays an incremental role in the composite material, but also plays a role in enhancing the modification effect, so as to improve the physical and mechanical properties of the composite material, so that talc can be better applied and more widely used Field of application. (click to view: 5 examples of surface modification of talcum powder)
Bentonite
The commonly used modification methods of bentonite include sodium modification, acid modification, roasting modification, salt modification, organic modification, inorganic pillared modification, inorganic / organic composite modification, etc. (click to see: 6 modification methods of bentonite)
Barite powder
Barite powder is widely used as the filler of coating, rubber and plastic, but its application in organic system is limited due to its hydrophilicity. Therefore, it is necessary to carry out surface modification to improve its dispersion and application effect in organic system. (click to view: 4 kinds of surface modifiers commonly used for barite powder)
Titanium dioxide
The hydrated oxides, such as Si, Al, Zr, CE, Ti and Zn, are coated on the surface of titanium dioxide to form a barrier between the surface and the medium, which can reduce the photocatalytic activity and enhance the application characteristics of titanium dioxide, such as weatherability, dispersion and powdering resistance. (click to view: one article about the inorganic coating modification technology of titanium dioxide)
Aluminum hydroxide
In order to make the ultra-fine aluminum hydroxide powder more widely used in flame-retardant materials such as polyolefin, the surface modification of aluminum hydroxide powder must be carried out to improve the physical and chemical characteristics of its surface, enhance the compatibility of ultra-fine aluminum hydroxide powder and matrix, that is, the compatibility and dispersion of organic polymers or resins in organic matrix, so as to improve the mechanical strength and comprehensive performance of the material. (click to see: the whole strategy of surface modification of ultra-fine aluminum hydroxide)
Nano silica
There are a large number of different states of hydroxyl unsaturated residual bonds on the surface of silica nanoparticles, which are hydrophilic, oleophobic and easy to agglomerate. (click to view: one article about the functional modification technology of silica nanoparticles!)
White carbon black
The surface modification of white carbon black is to make chemical substances react with hydroxyl groups on its surface, graft or coat other chemical substances, eliminate or reduce the amount of silanol group on the surface, and change the product from hydrophilicity to hydrophobicity, so as to change the surface properties. (click to see: white carbon black surface modification strategy, take it away!)
Pigment
The surface modification of pigment is to change the grain size, crystal phase and surface characteristics of pigment by physical or chemical methods, so as to improve the compatibility between the surface of pigment particles and dispersion medium and the stability of dispersion system. (click to see: how do international pigment giants modify the surface of pigments?)
Nanometer rice noodles
For nano powder, the preparation is only the first step, the most difficult is the surface modification and treatment for different media and different occasions. At present, the surface modification methods of nano powder mainly include coupling agent modification, organic modification and inorganic modification. (click to see: how to modify the surface of nano powder?)
▌ video | powder surface modification technology progress
▌ typical process and selection principle of powder surface modification
▌ the surface modifier is selected, can you really use it?
▌ if the surface modifier is selected in this way, the iron can't be wrong!
▌ learn these 7 surface modification methods, no uncertain powder!
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