亚洲五月综合缴情婷婷 , 天天操天天操 , 欧美黑人巨大日本人又爽又色 , 欧美成人视屏

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2023-01-08

H series extinction powder classification overview

1. Classification by production method: ? 1, precipitation production of white carbon black, such products are produced by precipitation method, the hole volume is small (about 0.6ML/G), the extinction efficiency is slightly poor, but the price is relatively cheap, used in leather treatment agent, shoe paint, ink and other industries for extinction is not easy to white spots. ? 2, gel production of large hole silica gel, such products have large hole volume (1.8ML/G), strong extinction efficiency, is the main product of Fujian Xinhe Nano Silicon Industry Co., Ltd. in the paint and coating industry. ? Two: Classified by surface treatment: ? 1, organic treatment products, such products are coated with wax, so as to prevent the effect of matting powder precipitation, the paint surface fullness and anti-profile performance is relatively good, but compared with the surface of the model without treatment, the price is slightly more expensive. The H series matting powder of Fujian Xinhe Nano Silicon Industry Co., Ltd. is an organic treatment model with "L" (the pinyin initial letter of wax). ? 2, inorganic treatment products: the surface of such products is not surface treated, it is generally recommended to share with micro-powder wax, so as to prevent precipitation of the fruit, this type of model because the surface is not coated with wax, so that theoretically the extinction efficiency is stronger, more transparent. The price is also cheaper than organic products. Inorganic products are generally used in paint coatings with low anti-settling requirements, and can also be used as an adsorbent for inkjet printing media to adsorb. ? Classified by use, Fujian Xinhe Nano Silicon Industry Co., Ltd. is a professional R & D, production and sales of ultrafine silica professional company. ? 1, matting powder, chemical raw materials used for matting in the paint and coating industry, generally with silica to matting. ? 2, printing media adsorbent, in the color spray paper, photo paper, oil painting cloth industry is more used, the chemical composition is also silica. ? 3, thickening agent, ultrafine silica because it is a hollow substance, so as to thixotropic thickening effect. It is widely used in paint and coating industry
Preparation
2023-01-08

Preparation of amorphous/crystalline nano silicon anode materials by fluidized bed pyrolysis

With the development of electric vehicles and other fields, people have put forward higher requirements for energy technology, and it is urgent to develop a new generation of lithium-ion batteries with low cost, long life and high energy density. Among many negative electrode materials, the development of high-capacity silicon negative electrode materials to replace the traditional graphite based negative electrode materials has become a consensus in the industry. However, the serious volume change of silicon during the cycle leads to a series of consequences such as material pulverization, electrode destruction and electrolyte drying, and finally shows poor cycle performance. In the past decade, academia and industry have invested a lot of resources to solve this problem, and the results are exciting, and the industrial application of silicon carbon materials is ready. The current research focus will shift to how to achieve the large-scale low-cost preparation of silicon materials and matching applications in full batteries. ? The research team of Associate Professor Wang Jiexi from the School of Metallurgy and Environment of Central South University and Engineer Zheng Anxiong from Zhejiang Zhongning Silicon Industry Co., Ltd. carried out production-research cooperation in order to promote large-scale low-cost preparation of silicon materials, and developed the preparation technology of amorphous/crystalline nano silicon anode materials by fluidized bed pyrolysis technology, and realized the precise control of amorphous silicon components in the materials. The findings were published in the journal Chem Comm under the heading "Fluidized bed reaction towards crystalline embedded amorphous Si anode with much enhanced cycling. stability "article. In the production of polysilicon in photovoltaic industry, one of the technical difficulties in the preparation of silicon by silane cracking is how to avoid homogeneous cracking in the empty tube at the upper end of the reactor to form amorphous silicon dust. In lithium batteries, this nano-amorphous silicon dust is an excellent silicon anode material. Lithiation of silicon undergoes a two-phase transition process: lithium ions intruded from the outside of silicon to form the LixSi phase, and the deformation between the LixSi phase and the internal unreacted silicon phase was uneven, resulting in stress resulting in material fragmentation. In crystalline silicon (c-Si), the silicon atoms are arranged in long order, and the diffusion path and interphase deformation of lithium are highly anisotropic. However, in amorphous silicon (A-Si), the silicon atoms are arranged in a long disordered range, and the critical rupture size of lithium reaction is much larger than that of crystalline silicon. In addition, this amorphous nano silicon powder is more suitable for the powder coating process currently used in the preparation of commercial lithium-ion battery electrodes. ? Figure 1 shows the characterization of amorphous silicon nanoparticles prepared. In the XRD pattern, the nanoparticle corresponds to the characteristic peak of silicon, and the peak strength is low, the half peak is wide, and the average grain size is 10.8 nm. Figure 1(b) shows that the nanoparticle is composed of crystalline silicon (520 cm-1) and amorphous silicon (480 cm-1). In FIG. 1(b) and (c), it can be seen that the silicon powder is a uniform spherical particle with a diameter of 30-80 nm, and there are both crystal phase and amorphous phase in a single particle. For this type of nanoparticle (c-a-Si) where crystals and non-crystals coexist, the degree of crystallization can be precisely controlled through process optimization. ? Figure 1. XRD, Raman spectrum, SEM and TEM images of c-a-Si nanoparticles. ? The isotropy of amorphous silicon helps to solve the problem of volume change in lithium alloying, but this long-range disordered structure makes the electronic conductivity of amorphous silicon much lower than that of crystalline silicon. Lithium materials require both electron and lithium ion conduction properties, and the above crystal/amorphous silicon nanoparticles balance this relationship with moderate electronic conductivity and isotropy characteristics. As shown in Figure 2(a) and (c), this C-A-Si material exhibits good cyclic properties. A problem here is that crystalline silicon is first lithiated at around 0.1V and then delithiated into amorphous silicon, and silicon crystals only exist for the first time. In order to make use of this structure, the authors increased the cutoff potential of lithium insertion to 0.12V by using the difference of the potential of crystal and amorphous silicon, and realized the electrochemical activity of nanoparticle non-crystalline silicon and the role of crystalline silicon as a supporting medium. As shown in Figure 2(b) and (d), although the reversible specific capacity is reduced to 1400 mAh/g, the cycle performance is greatly improved. ? Figure 2. F
The
2023-01-08

The application of silica

Fumed silica is a kind of ultra-fine powder material obtained by hydrolysis and condensation of halosilane at high temperature in an oxyhydrogen flame (Figure 1 is a schematic diagram of the synthesis principle of fumed silica). Due to its unique preparation process, it has a different structure and unique properties from other silica products. ? So what are the unique structures and properties of fumed silica? ? 1 Unique "three-dimensional dendritic" structure ? Because in the production process of fumed silica, the halosilane is first hydrolyzed and condensed into a single silica Particle, and then gradually grows into a spherical particle of 7-40 nanometers, which is called the "Primary Particle" of silica. ? The "primary particles" continue to move forward in the direction of the flame in the reactor, and the particles collide with each other. At this time, due to the relatively high temperature in the reactor, the particles are still close to the molten state. After the collision, the particles are fused together to form a three-dimensional dendritic structure of particles fused together by multiple spherical particles. It is called an "Aggregate Particle" of silica. Because the particles in aggregates are fused together, they are stable structures that are almost impossible to separate. ? The silica "aggregates" continue to move forward with the air flow in the pipe, collide, and then join together to form a flocculent fluffy powder called the silica "Agglomerate Particle" (Agglomerate Particle). Due to the low temperature in the pipeline at this time, the connection between the "aggregates" is only connected by physical adsorption, which is an unstable structure, and under a certain mechanical force, it is separable (dispersible). ? FIG. 2 is a transmission electron microscope image of fumed silica. Figure 3 is a transmission electron microscope image of precipitated silica. It can be seen from the photos that there is a significant difference in the dispersion state between the two. It is precisely because the dispersed fumed silica in the system can form a "nearly perfect" three-dimensional network structure of nanoparticles, which makes it have excellent reinforcement, thickening, thixotropic, anti-settlement, and release and hanging properties. ? ? ? 2 High surface activity ? In the process of hydrolysis and condensation of fumed silica at high temperature, there are still some silica hydroxyl group (Si-OH) on the surface, which makes the surface polarity of fumed silica stronger and surface activity higher. FIG. 4 is a schematic diagram of the surface structure of fumed silica ? ? ? FIG. 4 Surface structure diagram of fumed silica ? As can be seen from the figure, there are "silicoxy group" and "silicon hydroxyl group" on the surface of fumed silica, in which the silicon hydroxyl group has a high activity, can form hydrogen bonds, or react with other groups, which also ensures the formation of a stable network between silicon dioxide particles, and has a good interaction with other media, so that silicon dioxide presents a good strengthening and toughening; Thickening thixotropy and anti-settling properties. ? In addition, the presence of silicon hydroxyl group also provides the possibility for the surface modification of fumed silicon dioxide. Surface modifiers with different structures are selected to react with silicon hydroxyl group, and some functional groups are grafted to the surface of fumed silicon dioxide, thus making the function of fumed silicon dioxide more diversified. ? 3 The particle size is small and the specific surface area is large ? The "primary particle size" of fumed silica is 7-40nm, which is a concept? We can understand this by comparing the data in the following table. If we were to enlarge a fumed silica particle to the size of a standard football, we would need to enlarge it by about 30 million times; If you were to scale a soccer ball up 30 million times, it would be about the size of Mars. ? ? ? Due to the small particle size of fumed silica, its specific surface area is very large, usually the specific surface of fumed silica is 100-400m2/g. Usually we have a 150m2 house, its indoor area is about 120m2, that is, the use of the lowest specific surface area of the market common fumed silica products (such as HL-150), less than 1g, its specific surface area can cover the entire house indoor area! And if it is like a product with a high specific surface area (such as HL-380), only 18.8g of products, its specific surface area is equivalent to the area of a standard football field! ? It is precisely because of the characteristics of small particle size and large specific surface area of fumed silica that it has good adsorption performance, and can be widely used in the fields of catalyst, food, medicine, thermal insulation materials, and plays the functions of adsorption, anti-caking, heat insulation and so on. ? In the powder industry, fumed silica is mainly used as an
Domestic
2023-01-08

Domestic matting powder industry status

In the past, domestic matting powder mainly relied on imports, until 2005, the monopoly position of imported matting powder was broken, the main reason is: the technological progress of domestic manufacturers, the comprehensive performance of domestic matting powder has reached or approached the quality of imported products, while the price of domestic matting powder is relatively low. In recent years, the rapid development of the domestic coating industry, the development of the matting powder industry has also accelerated, the domestic matting powder has gradually established a dominant position in the domestic market, the national brand represented by Hongsheng began to enter the international market, and has achieved good results. There are still some problems in the development process of the entire matting powder industry: · R&D and innovation efforts are insufficient, and most enterprises are still in the imitation stage, producing substitutes for certain products in the market. · Market segmentation and product segmentation positioning are not clear and systematic. · The proportion of environmentally friendly matting powder is relatively low. Obviously, there is still a long way to go to solve these problems. The development trend of domestic matting powder China's matting powder has become one of the most important forces in the world, whether in the scale of production or consumption, and the development is still accelerating, and the prospects are great. 1, the application field will be more and more wide. Today's matting powder has become an indispensable additive for automotive plastics, paint, cosmetics, medicine and other industries. With the development, production and promotion of environmentally friendly matting powder, the application field will be further expanded. 2, green products will be popular. With the popularity of the concept of environmental protection and health, and the gradual deepening of human awareness of the importance of environmental protection, environmentally friendly matting powder (water-based matting powder) will be the theme on the road to future development. 3. Increase investment in scientific research. It is understood that the cost of research and development of well-known foreign coating additives enterprises is much higher than that of domestic enterprises, so we want to occupy a place in the international market, we must increase investment in scientific research, deepen the integration strategy of production, education and research, cooperate with industry, schools and research institutions, play their respective advantages, and form a strong integrated system of research and development, production and promotion. At the same time, advanced technology and equipment from abroad, accelerate the transformation of scientific research results, achieve scientific and technological innovation, produce cost-effective products that can meet market demand, and enhance their competitiveness. 4, market segmentation, product segmentation positioning will be more clear, industry development is more standardized. Product segmentation can better meet the individual needs of different customers, solve the trouble of customers looking for products to keep trying, save manpower and material resources, and realize the optimal combination of resources. For production enterprises, the advantages can be concentrated in the selected market segments of the enterprise, so that the relative disadvantages in the overall market are transformed into absolute advantages in the local market, so as to improve the competitiveness of enterprises. The development of the industry is more standardized, and the "extinction silica industry Standard" led by the subsidiary of Lingwei Technology Group, Lengshuijiang Sana New material, has been implemented on March 1, 2014, which is an important initiative in the matting powder industry. This will actively guide the standard, sustainable, stable and healthy development of the matting powder industry. Scientific and technological innovation is the driving force of the company's sustainable development If a company wants to continue to develop, it cannot do without scientific and technological innovation, and scientific and technological innovation is the driving force of the company's sustainable development. If you want scientific and technological innovation, you must have talents. For this reason, Xinhe Nano Silicon industry has attached great importance to the introduction and training of talents since its establishment, and has formed a scientific research team composed of experts, professors, associate professors, doctors, senior engineers and other outstanding talents, and has also introduced advanced technology and equipment from Germany to accelerate the transformation of scientific research results. The company has successfully developed Hongsheng S series advanced wood paint matting powder, HSF series textile coating matting powder, HS ser
How
2023-01-08

How to evaluate the quality of matting powder

At present, most of the coating industry uses silicon dioxide to physically matte (silicon dioxide is stable and basically does not react with other substances), but some special coatings (such as powder coatings) use other chemical raw materials to matte. Fujian Xinhe Nano Silicon Industry Co., Ltd. is also a company specializing in the production of silica. The performance of matting powder is mainly considered from the following aspects. ? 1. Extinction efficiency. In the case of the same dispersion fineness, the less the amount added, the better the performance of the matting powder. For example, the same as the scraper is less than 20 microns, A matting powder added 5% of the paint weight to reach 5 spectroscopy, and B matting powder is added to 8%, which means that a matting powder is definitely better than B matting powder, cost-effective. The silica matting powder of Fujian Xinhe Nano Silicon Industry Co., Ltd. is recommended to add about 3% in the case of semi-matte, and more than 6% in the case of full matte. ? 2. Transparency. In transparent varnish, the transparency of matting powder is an important index to measure the performance of matting powder. Under normal circumstances, the matting powder with yellow phase is best, followed by blue phase, and red phase is worst. The refraction index of the ultra-fine silica matting powder is 1.46, which is the same as the refraction coefficient of the general resin, so as to achieve good transparency. ? 3, dispersion fineness. Silica matting powder is a physical matting, is in the drying process of the paint, the surface of the paint film contains many small matting powder particles, so as to form diffuse reflection, so as to achieve the matte matting effect. The smaller the dispersion fineness of the matting powder, the better the paint surface feels and the smoother it feels. In order to have good extinction efficiency and good dispersion fineness, the narrower the average particle size distribution of the matting powder is required. Matting powder is generally micron grade, and the particle size of a certain model refers to the average particle size. Fujian Xinhe Nano Silicon Industry Co., Ltd. series of matting powder, there are about 10 models, particle size from 1 micron to 5 micron. ? There are other indicators to measure the performance of the matting powder, such as anti-characterization, fullness, adhesion and so on.
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