There are a wide variety of brands and types of toothpaste on the market, and there are all kinds of toothpastes with various raw materials and flavors. Today, Baxter will take you to take an in-depth look at the important factors that affect the quality of toothpaste from another perspective.
According to the description of the national standard "Toothpaste (GB 8372-2008)", toothpaste is a paste-like substance composed of a mixture of friction agents, humectants, thickeners, foaming agents, aromatics, water and other additives (including functional ingredients used to improve oral health). No matter what brand of toothpaste, the main ingredient in it is friction agent, and the cleaning effect is mainly done by friction agent. Common toothpaste friction agents are powder materials, commonly used calcium carbonate, silicon dioxide, calcium phosphate, insoluble sodium metaphosphate, calcium pyrophosphate, etc., their content in toothpaste is between 20% and 60%, therefore, for a high-quality toothpaste, control the particle size of the friction powder material is particularly critical, toothpaste made of friction agent with appropriate particle size, has a smooth and delicate appearance and a comfortable feeling for the mouth and gums when brushing teeth, the particle size is too small The cleaning effect is not good, and the particle size is too large to damage the tooth surface. Studies have shown that friction agents work best with particle sizes between 5 and 40 m, and that particles less than 5 m and more than 40 m are as low as possible.
1.Toothpaste particle size detection experiment
In this paper, the bettersize2600 laser particle size analyzer from Dandong Baxter Instrument Co., Ltd. was used to detect the particle size distribution of three types of toothpaste samples A, sample B and sample C of different brands of toothpaste sold in the market.
2.The degree of difference in granularity
We analyzed the particle size of the friction agent in three toothpaste samples with the bettersize2600 laser particle size analyzer, and the results are as follows:
FigParticle size distribution, morphology and data of three types of toothpaste.
It can be seen from the above particle size distribution that the particle size distribution of the three toothpastes is different, although their D50 is not much different, but sample A has the most particles greater than 40 m, and many particles are even larger than 100 m;The content of sample b is less than 5 m, and many particles are even less than 1 mSample C was most abundant between 5 and 40 m, with fewer particles greater than 40 m and less than 5 m.
Through the images taken by the electron microscope, it can be intuitively seen that there are more large particles in sample A and more small particles in sample B, while the particles in sample C are more uniform, and there are fewer large particles and small particles, and the electron microscope images are consistent with the test results of the bettersize2600 laser particle size analyzer.
3.Conclusion
The particle size analysis of the friction agent in the three toothpastes was carried out by the BetterSize2600 laser particle size analyzer and electron microscope, and the conclusion was that the quality of sample C was the best, followed by sample B, and sample A was the worst. At the same time, this experiment also gives a revelation to toothpaste manufacturers, that is, it is an effective method to control the quality of raw materials through laser particle size analysis.