Insulation material industry will also be a new step

electrical insulating board as a basic material, a wide range of applications, such as the national economic lifeline of the power industry, its development and high-performance insulation materials are closely related. Insulation material is to ensure that electrical equipment, especially power equipment can be reliable, lasting and safe operation of the key material, its level will directly affect the power industry development level and quality of operation. And it plays a very important role in improving the overall level of national industry and promoting the stable and rapid development of national economy.
With the economic development, China's transmission line of the highest voltage level will be increased from 500kV to 750kV or 1000kV, and the transmission line voltage level for each step up, power equipment insulation system should be a corresponding increase. There is no high-performance insulation materials to ensure that from the power generation, power transmission to all the electricity system is likely to occur local power grid instability, serious will make the entire power grid paralyzed. Therefore, in the protection of power generation, power transmission, electrical equipment operation reliability and stability, the advanced nature of insulation, stability has a very important significance.
For the defense, the military equipment in the power, control, communications, radar and other systems need insulation materials, to develop new military equipment, must also have a new type of insulating material for the pilot. Such as nuclear submarines require the use of anti-salt spray, moisture, mildew, radiation-resistant anti static plastic sheet, such as aerospace aircraft need high dimensional stability, low temperature, radiation-resistant insulation materials. If the insulating material can not meet the harsh conditions of these harsh use of the environment, will lead to military equipment in many important systems can not function properly.

Characteristics of 3240 Epoxy Plate and Its Application

As a widely used material, epoxy board in a variety of circuits have a wide range of applications. This is concerned, it is necessary to talk about the application of a wider range of 3240 epoxy board, and it is a kind of electric glass cloth impregnated with epoxy resin, dried, hot pressed from the material, which has yellow, white, green Points, at room temperature 130 ℃ also has a high mechanical strength, but also in the dry, wet state of transformer pressboard is very good, can be flame retardant, electrical, electronic and other industries in the use of insulating structure parts. In addition, 3240 epoxy board also has the following characteristics:
Synthesis: is a special non-alkaline glass fiber cloth impregnated with epoxy phenolic resin, after baking, hot and thus made.
Thickness: Under normal circumstances 0.5 ~ 50mm, can also be required to produce 50 ~ 150mm thick plate.
Performance: mechanical and dielectric properties are relatively high, and heat resistance and moisture resistance are better, and a good mechanical processing, heat-resistant grade is B, can be stamping. After curing the epoxy resin system has excellent mechanical properties, medium temperature under the machine high strength, high humidity electrical stability under the good.
Electrical: After curing the epoxy resin system is a high dielectric properties, resistance to surface leakage, resistance to arc of the excellent polyimide glass fiber.
Uses: machinery, electronics, electrical use. Applicable to machinery, electrical, electronics, electrical and other fields. Also used for insulation processing parts, or processed into various types of insulation accessories, equipment, such as insulation components.

Analysis on Industrial Chain Structure of CCL and Insulating Materials Industry

As an intermediate application of products, CCL and bakelite electrical insulation board industry is also limited by the upstream and downstream industry constraints. In general, if the upper and lower industries have a greater volatility, will have an impact on the development of our industry. So, for these two closely related industries, now the development of the status quo is what?
 First, the upstream industry development status quo
Often, we are exposed to the upstream industry for glass fiber cloth, epoxy resin, electrolytic copper foil and other industries, the industry's products related to glass fiber cloth, copper foil, alumina and epoxy resin / modified resin. In the case of economic fluctuations, but also on the impact of raw material prices, which also affected the varying degrees of CCL and insulation materials production progress.
Second, the downstream industry development status
Our downstream industry mainly PCB industry, LED industry and mica insulation sheets, rail transportation and other industries. Our products are widely used in computer, communications, consumer electronics, industrial / medical, military, semiconductors and automobiles. The printed circuit boards are widely used in the production of printed circuit boards. And other industries, almost involving all electronic information products. Among them, the computer, communications and consumer electronics is the three main applications, accounting for the PCB industry output value of about 70%. In addition, all kinds of insulating materials are directly used in the production of insulation assembly, terminal customers include electrical and electronic, instrumentation, computer, communications, consumer electronics and transportation and other fields.

What are the key factors in determining the performance of insulating materials?

Various types of NMN Insulating material are often used in various circuit facilities. However, for different areas of use, the performance of the selected insulating material is different. So what is the key factor in the performance of a constant insulating material?
 First, the breakdown voltage, electrical strength: in a strong electric field under the destruction of insulating materials, insulation ladder loss of insulation properties lead to conductive state, known as breakdown. The breakdown voltage is called the breakdown voltage. The electrical strength is the breakdown of the voltage at the time of breakdown under the specified conditions and the distance between the two electrodes serving the external voltage, that is, the breakdown voltage of the unit thickness. For insulating materials, the general breakdown voltage, electrical strength of the value of the higher the better.
Second, the ignition resistance: With the increasing application of insulating materials, the requirements of its fire points are also getting higher and higher. Many manufacturers are beginning to use a variety of ways, and constantly improve the resistance of crepe paper tubes. The higher the ignition resistance, the security will be better.
Third, the arc resistance: in the provisions of the implementation of the conditions, the insulation material to withstand the arc along the surface of the ability to touch. The use of interchangeable high-pressure small current, by high pressure in the arc between the two electrodes caused by moving, so that the surface of the insulating material to the conductive layer of the time required to determine the arc resistance of mica insulation tape. In general, the greater the time value, the better the arc resistance.

Why the insulation temperature of different insulation materials will be different?

For different grades of diamond dotted paper, the ultimate operating temperature will be different. Therefore, in many electrical installation, also need to take into account the entire circuit can withstand the maximum temperature conditions. When there are special circumstances, some important materials can withstand high temperatures, but also to measure the stability of the entire electrical device key. For the insulation of several common insulation class, like the A-class limit operating temperature of 105 ℃, but its maximum allowable temperature is only 90 ℃. The reason why these two temperature values ​​will be different, mainly due to the following reasons:
    1, thermometer method. The measurement results reflect the local surface temperature of the winding insulation. This number is averaged about 15 ° C lower than the actual maximum temperature of the winding insulation, the "hottest". The law is the simplest, in the medium and small motor field application of the most extensive. For low-resistance windings, this method is more accurate than the resistance method. As the mercury thermometer in the alternating magnetic field due to eddy current loss heat, so the use of alcohol in the AC motor thermometer.
    2, resistance method. The measurement results reflect the average value of the entire winding copper temperature. The number of the actual maximum temperature according to the different phenolic laminated sheet level reduced by 5 ~ 15 ℃. The method is to measure the cold and thermal resistance of the conductor, according to the formula to calculate the average temperature rise.
    3, embedded detection thermometer test copper or platinum resistance thermometer or thermocouple embedded in the winding, the core or other needs to measure the expected temperature of the highest parts. The measurement results reflect the temperature at which the temperature measurement element contacts. Large motors often use this method to monitor the operating temperature of the motor. In the range of 100 ~ 200 ℃ copper or platinum resistance thermometer is more accurate, and thermocouple is not commonly used.
    In addition, the closed fan cooling motor resistance method measured by the temperature measured by the thermometer method of 0 ~ 15% higher; protection of 10% to 20%. While the resistance method and the embedded copper resistance thermometer difference of ± 5%. Therefore, the various measured methods measured by the temperature and the actual maximum temperature difference, and can not really reflect the flexible composite materials of insulating materials, so the insulation material should be "limit the operating temperature" minus the difference is "Maximum allowable operating temperature".

Common Defects and Solutions of Adhesive Tape in Epoxy Plate

As one of the DMD insulation paper in the epoxy board, the quality of the adhesive sheet will directly affect the quality of CCL. For many production targets unqualified products, in the follow-up processing can also be adjusted to make up, but the subsequent production process will bring greater difficulty and inconvenience. Usually the surface of the adhesive film is smooth, no resin particles, bubbles, discount, fish eyes, exposed cloth pattern, yarn breakage yarn, yellow lines, impurities and other defects, and resin content, gel time, volatile content Technical indicators are to meet the requirements of the process requirements. In contrast, the poor quality of the adhesive sheet is much more, then what should we take remedial measures?
First, too much surface particles
The main reason for this defect is that the resin does not sufficiently penetrate into the cloth and forms a granular attachment on the surface. As the hardness of colloidal particles than the copper foil in the process of copper cladding in the corresponding point of the copper foil will be subject to extrusion extension thinning, may cause the printed circuit board is reflected in the appearance of copper foil surface highlights, As the bright spots on the copper foil surface of the antioxidant layer is destroyed, the product at the time of storage is easy to be oxidized or even the formation of corrosion points, greatly reducing the product storage cycle.
Second, glue marks
The main reason for the occurrence of glue marks is the resin content is too large, soaked glass fiber cloth through the measuring roller vertical into the oven, there is liquidity in the liquid due to the impact of gravity on the surface of the cloth to form strip marks. The presence of the marks will have a certain impact on the flatness and warpage of the CCL. In this case, the resin content of the adhesive sheet should be adjusted in time.
Three bubbles
There are two main reasons for the occurrence of bubbles, when the glue is not fully infiltrated into the gap, the air in the gap is not discharged, when the glue was covered with glue in the cloth. When the furnace into the oven due to heat, the residual air expansion in the mica tape for cable surface to form bubbles; dipping tank in the plastic bubble generated by the bubble floating on the surface of the glue, the measuring roller does not completely spread the bubble on the cloth.

The role of insulation material tube is in the electrical equipment to the potential of different charged part of the isolated. Therefore, the insulation material should first have a high insulation resistance and compressive strength, and to avoid leakage, breakdown and other accidents. Second, the heat resistance is better, to avoid long-term overheating and aging deterioration; In addition, there should be good thermal conductivity, resistance to lightning and high mechanical strength and process processing and other characteristics. According to the above requirements, commonly used insulating material performance indicators are dielectric strength, tensile strength, specific gravity, expansion coefficient.
Electrician commonly used mica insulation tape according to their different chemical properties, can be divided into inorganic insulation materials, organic insulation materials and mixed insulation materials. Commonly used inorganic insulation materials are: mica, asbestos, marble, porcelain, glass, sulfur, etc., mainly used for motors, bakelite sheet suppliers, switch the bottom plate and insulators. Organic insulating materials are: shellac, resin, rubber, cotton yarn, paper, linen, rayon, etc., mostly used to manufacture insulating paint, winding wire wound insulation and so on. Mixed insulation materials for the above two kinds of materials through the processing of various molding insulation materials, used as electrical appliances of the base, shell and so on.

The researchers said that the researchers chose the chemical nature is very stable, almost no impurities containing potassium tantalate as an insulating material, and then the solid insulation material placed in an ionic liquid, the surface of the insulating material will spontaneously form an electric double layer. In this electric field effect, the electrical insulating board has a superconductivity, in the absolute temperature of 0.05 open (minus 273.1 degrees Celsius) environment to achieve a zero resistance.
It is reported that the research and development of superconducting materials to the main use of two major methods, one is mixed with several kinds of metal metallurgical methods, and the other is the insulator as the main material mixed with impure chemical method, the most representative of the copper Oxide high temperature superconducting material.
The use of electric field effect of the method can be described as the development of superconducting materials, a new means, it can make potassium tantalate such as the original people that can not become mica insulation sheetsl has a superconductivity for the future development of higher critical temperature of the new Superconducting materials laid the foundation.