Fireproof materials are very important for the cable industry, and new application scenarios pose new challenges and requirements for fireproof cable grade magnesium oxide.
Under the influence of scientific and technological progress, modernization requirements, and electrical fires, the market demand for fire-resistant cable grade magnesium oxide has rapidly increased. According to data from China Fire Protection, electrical fires still rank first among all types of fires in 2019. Even the classic building "Notre Dame de Paris", which has stood in Paris for more than 800 years, caused an electrical fire caused by "wire and cable", and it was completely destroyed.
In fact, the demand for magnesium oxide insulated fireproof cables involves almost all industries, including subways, high-speed rails, ships, airports, communication hub projects, various types of high-rise industrial buildings, and hotels, shopping malls, hospitals, theaters, ancient buildings, etc. A crowded public place. It also involves the application of special scenarios such as high temperature and nuclear power, such as power plants, high-speed rail plants, nuclear power plants, chemical plants, offshore oil platforms and other special scenarios. There is a huge demand in electrical buildings in the fields of fire protection systems, emergency lighting systems, alarm systems, automatic fire sprinkler systems, personnel evacuation systems, military installations and devices, and explosion-proof areas. In the power and building design manuals or specifications formulated by the relevant state departments, it has been gradually stipulated that certain occasions must use copper core copper sheathed magnesium oxide insulated fireproof cables. The demand for fireproof cables also directly drives the development and growth of upstream industry fireproof cable grade magnesium oxide.
Fire-proof cable-grade magnesium oxide is the most important insulating and high-temperature-resistant filling material for copper-core copper sheathed magnesium oxide insulated fire-proof and explosion-proof cables. Due to its special materials and structure, it is unmatched by organic cables (plastic cables) Electrical performance, mechanical performance, environmental resistance and environmental performance.
Due to the high content of magnetic materials in the raw materials of fire-resistant cable grade magnesium oxide, mechanical iron and ultra-fine powder doped with more particles are generated during the particle size crushing and shaping process, so it is affected by the uneven wrapping of the moistureproof agent and the lack of high temperature resistance Next, it seriously reduces the pulse high-voltage strength and high-voltage high-temperature electrical performance of magnesium oxide. Technical defects also restrict the application of upstream materials such as fireproof cable grade magnesium oxide to copper core copper sheathed magnesium oxide insulated fireproof cables and other products, making rigid mineral insulated fireproof cables resistant to high temperature, moisture, fire, explosion, and non-combustible And the service life and other issues are difficult to meet the higher requirements of users.
Therefore, for a long time in the past, the highly sophisticated technology of insulating materials for mineral cables was still controlled by European and American companies, and the market was once monopolized by European and American countries. For the industry, the market value of fire-resistant cable grade magnesium oxide is extremely high. It is urgent to break through the technical difficulty and seize the market demand.
As China's leading innovative technology enterprise of magnesium oxide functional materials such as fire-proof cable-grade magnesium oxide, LNJS Ceramic Materials Technology Co., Ltd. has jointly developed with Dalian University of Physics and Chemistry, Northeastern University, Liaoning University of Science and Technology and other colleges and universities to hire senior experts in the magnesium industry As a technical consultant, actively promote the transformation and upgrading of the traditional magnesium material industry.
The research team developed a special magnesium oxide powder filling material mainly used in the production of fire-resistant and high-temperature resistant cables (BTTZ). The material has excellent electrical properties and thermal conductivity, and can withstand a maximum of 1400 ℃ high temperature and long-term flame destruction experiments. Since the product has been put on the market, it has met the design and extreme environmental requirements of various fire-resistant cables. This fire-retardant cable-grade magnesium oxide has excellent comprehensive performance, high packing density, strong fluidity, and strong insulation and moisture resistance, which will greatly improve the packing density and durability of the cable. In terms of use effect, the experiment shows that it can withstand the highest high-voltage electrical breakdown strength of 7500V / 10 minutes, and has applied for 5 national invention patents.
In fact, LNJS and Dalian University of Technology have already established a "special magnesium material joint research and innovation platform" and a "postgraduate innovation practice base", and set up a professional technology research and development center, equipped with advanced and complete experimental research instruments and testing equipment. Timely and accurate testing of incoming raw materials, process parameters, and product performance to ensure the controllability of the process and the stability of product quality. It is precisely because of the coordinated cooperation and continuous research and development of many parties that we have today's fire-resistant cable-grade magnesium oxide JS -KF, also known as magnesium oxide for fireproof cable (mining cable).
Products:
Special high temperature electrical grade magnesium oxide
Fire-proof cable grade magnesium oxide KF series
Moisture-proof high-temperature electrical grade magnesium oxide
Moisture-proof low-temperature electrical grade magnesium oxide
Moisture-proof electrical grade magnesium oxide
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Whether the coding geometry and natural distribution group of magnesium oxide powder particles is reasonable will directly affect the quality and filling reliability of fire-proof cable grade magnesium oxide powder. If the particle size shape and distribution are not suitable, its mechanical strength and electrical insulation performance will be affected.
The company's technical R & D personnel researched the relationship between the particle size and strength of the raw materials, the powder composition and the forming eye. From the perspective of cost optimization, the appropriate production process and raw material ratio were finally determined. LNJS engineers said that the magnesium oxide powder we produce has a certain granularity, and the shape is generally round rather than the flakes currently produced by other enterprises in China. Only the round shape can make the filling powder dense, fluid, and have a certain percentage of particles. When adding powder, it is not easy to damage the high-conductivity wire conductor, ensuring that the powder is filled without difficulty. While improving the production process and innovating the raw material ratio, LNJS has also made technological innovations in the existing crushing, grinding and molding equipment to improve production efficiency and reduce costs. LNJS also uses high-temperature plasma technology and inorganic modification technology to realize the industrial production of fire-proof cable-grade magnesium oxide, and achieve large-scale production while improving technology to meet the industry's demand for fire-resistant cable-grade magnesium oxide.