Chemical experiment products

  Castables are the main type of monolithic refractories. Depending on the adhesive used, the cure formation mechanism can be divided into three types: hydraulic, air-hard, and hard. It is also the most widely used refractory material at present. Although it is very convenient in construction, it has high requirements for objective factors, not only the proportion of configuration, the amount of water added, but also the storage environment and kiln. There are also special requirements before the furnace is fired. 1. Hydraulic castables: Castables with cement as binder require water to participate in the chemical reaction in the hardening process to form cement hardening strength, all of which are hydraulic refractory castables . Cement is the main factor determining the strength of castables (especially the strength at room temperature), but its refractoriness is relatively low, so after ensuring the necessary strength at room temperature, the amount of cement shoul...

  Heavy metals generally refer to more than 60 elements with a density of more than 4 or 45 elements with a density of more than 5. However, because the toxicity of different heavy metals in water and soil is very different, in the field of environmental science, people usually pay attention to vanadium, chromium and nickel. , cobalt, copper, zinc, cadmium, tin, mercury, lead and other metal ions. Heavy metal ions can accumulate in the human body and lead to poisoning, cancer and damage to the nervous system, so it is particularly important to do a good job of heavy metal pollution control. Graphene oxide   is a carbon nano material prepared from natural graphite with a structure similar to carbon nanotubes . Compared with the adsorption capacity of activated carbon, carbon nanotubes and graphene materials for low-concentration lead-containing wastewater, the adsorption capacity of graphene oxide for lead is as high as 800 mg/g, which is much higher than that of activated car...

Graphene is a two-dimensional material. Carbon atoms are arranged in a hexagonal shape and are connected to each other to form a carbon molecule. Its structure is very stable. As the number of connected carbon atoms increases, the two-dimensional carbon molecule plane keeps expanding, and so does the molecule. A single layer of graphene is only one carbon atom thick, that is, 0.335nm, which is equivalent to 1/200,000 of the thickness of a hair. There will be nearly 1.5 million layers of graphene in 1 mm thick graphite. Graphene is the thinnest known material and has the advantages of extremely high specific surface area, superior electrical conductivity and strength. The existence of the above advantages is that it has a good market prospect. Various applications of graphene oxide powder on mobile phones are as follows: Screen Graphene screens can use force sensors, bringing a new dimension to touchscreen technology. Furthermore, thanks to graphene's high toughness, these new prop...

  The nano raw materials used in the coating field are mainly divided into the following categories according to their functions: Photocatalytic nano-coatings, weather-resistant nano-coatings, high-mechanical properties nano-coatings, transparent heat-insulating nano-coatings, and conductive nano-coatings. 1.Photocatalytic Nanocoatings Using the photocatalytic properties of Titanium dioxide nanoparticles , scientists have already carried out the protection of historical building relics. The researchers took advantage of the wide catalytic properties of nano-TIO2 that most of the Ca(OH)2 in the layer reacted with SO2 oxidized by OH to form CaSO4, which prevented the further erosion of buildings by SO2 and CO2 in the air, and effectively protected historical buildings. remains. In the application of photocatalytic decontamination and sterilization, CUxO/TIO2 nanocomposite products that can absorb visible light have been applied indoors. 2. Weather resistant nano coating The high-ene...

  Because carbon nanotubes have a similar structure to polymer materials (epoxy resin, polystyrene, polymethyl methacrylate, polyacetylene, nylon and polyurethane, etc.), it is easy to form an ideal interfacial bonding force when mixed, resulting in improved performance. The composite material exhibits excellent strength, wear resistance, electrical conductivity, antistatic properties and other properties that the polymer itself does not have. 1. The acidified carbon nanotubes were compounded with high-density polyethylene (HDPE), and the oriented carbon nanotubes/HDPE composites were prepared by mechanical blending method, which improved the yield strength and tensile strength of the composites. modulus. 2. The carbon nanotube/polytetrafluoroethylene composite material prepared by the customer has a reduced coefficient of friction and improved wear resistance. 3. A company uses carbon nanotubes to reinforced polyurethane composite materials, with a strength/weight ratio of more t...

  As one of the important parts of lithium ion batteries, the diaphragm can avoid the positive and negative electrode contact and promote the shuttle of lithium ions between the two electrodes. It does not participate in the electrochemical reaction, but determines the performance and safety of the battery. Inorganic ultrafine powder coating or composite modified polymer is one of the effective methods to improve the thermal stability of the diaphragm. Using inorganic powder with high heat resistance and mechanical strength as a modifier can improve the mechanical strength of the separator and reduce the thermal shrinkage of the separator. In addition, the mixed inorganic ultrafine powder material has a good affinity with the electrolyte, which can enhance the absorption rate of the electrolyte, thereby helping to achieve a uniform distribution of lithium ions. The ultrafine powder can also increase the stability of the slurry and ensure the uniformity of the coating on the diaphra...