Toothpaste cleans and protects our teeth, allowing us to laugh freely and eat freely. But what do you know about it? Do you know what its main ingredients are? When you are in front of the supermarket shelf, looking at toothpaste with different properties, do you want to know that why it can have these properties?
The abrasive is one of the important ingredients in the production of toothpaste, which mainly plays a role in cleaning the teeth without wearing them. There are many varieties of toothpaste abrasives that can be used, such as calcium hydrogen phosphate, precipitated calcium carbonate (light calcium carbonate), calcite powder (heavy calcium carbonate), silicon dioxide, etc., of which calcite powder is the most used one.
The price of calcite powder is low, and it is mainly obtained from calcite ore directly through grinding machine grinding process. It is usually a raw material for the production of low-value toothpaste, but its performance cannot meet the needs of mid-to-high-end toothpaste, especially after various active substances are added to mid-to-high-end toothpaste, which seriously affects the stability and shelf life of toothpaste.
Silica can be stably compounded with various active substances to meet the needs of medium and high-end toothpastes. It once became a high-quality raw material for toothpaste production, but the price is relatively high, about 7-20 times the price of calcite powder, which is largely restricted The development of the toothpaste industry. With the development of industrial technology, people began to use methods such as abrasive compounding to prepare toothpaste, which can improve the stability of toothpaste and reduce costs.
At present, the main methods used for surface modification of non-metallic mineral powder are: surface chemical coating modification method, precipitation reaction modification method, mechanochemical modification method, intercalation modification and composite method.
Surface organic coating modification: Use the functional groups in the organic surface modifier molecules to adsorb on the particle surface or chemical reaction to modify the particle surface. Commonly used surface modifiers include coupling agents (silanes, titanates, phosphates, etc.), higher fatty acids, silicone oils or silicone resins, and water-soluble polymers.
Precipitation reaction coating: use chemical precipitation reaction to precipitate and coat the surface of the modified particles on the surface of the modified particles.
Mechanochemical modification: Use powder ultrafine pulverization and other strong mechanical forces to purposefully activate the particle surface, make the structure complex or make the surface amorphous, and enhance the reactivity with organic or other inorganic substances.
Intercalation modification refers to the method of changing the properties of the powder through ion exchange reaction or characteristic adsorption by using the weak bonding force between the layered structure of the powder particle crystal layer or the existence of exchangeable cations.
Compound modification refers to the comprehensive use of multiple methods.
The modification of calcium carbonate is mainly to adjust and modify the shape and surface, so as to improve the acid resistance and fluoride compatibility of the calcium carbonate abrasive in the toothpaste, and reduce the wear on the teeth.
For calcite powder, we use mechanical methods for surface modification: put the ground calcite powder with a fixed mesh into the CLG powder surface modifier, and then add the surface modifier for high-speed kneading.
The modified calcite powder can improve the stability and appearance quality of toothpaste.
Powder surface modification is widely used. In addition to calcite powder, other industrial powders can also be modified, and they are fully utilized in plastics, rubber, papermaking and other industries. CLG powder modifier is widely used in non-metal filling fields such as pigments, plastics, rubber, adhesives, polymer materials, polymer composite materials, functional materials and coating industries.
CLG powder surface modification machine is completed by three modifier rollers. Put the dry powder and the quantitative medicine into the modified roller at the same time. With high-speed rotation, materials and reagents run in the form of fluidized vortex. The powder modification is completed by the heat generated by high-speed shearing, collision and friction between the rotor, stator and powder.
CLG powder surface modification machine has large capacity and is suitable for industrial production of various scales. The modification efficiency is high, and the particle shape change is small. It has both modification and dispersion functions, and is suitable for any fine material. It has a special active effect on materials with small proportions such as white carbon black, mica powder, and talc powder.