At the beginning of this century, due to the successful development of various types of synthetic resins and synthetic rubbers, especially the production and commercialization of some representative polymers such as phenolic resin, urea-formaldehyde resin, unsaturated resin, epoxy resin and neoprene rubber, It has promoted the rapid development of modern adhesives and adhesive technology. Autonomous Emergency Braking,Brake Charity,Emergency Braking,Autonomous Braking Zhejiang Huzhou SCVE Machine & Motor Co., Ltd. , https://www.scve-motor.com
Since the 1980s, adhesive and bonding technology has progressed significantly, new and excellent adhesives have emerged, and due to its unique adhesive technology, it has extraordinary versatility and can achieve multiple purposes. Therefore, it has been more widely used. There are many classification methods for adhesives, which are different. Commonly used are:
1) Classification by chemical composition: This is a more scientific classification method, which divides the adhesive into organic and inorganic adhesives. Organic adhesives are further divided into synthetic adhesives and natural adhesives. Synthetic adhesives are resin type, rubber type, composite type, etc.; natural adhesives include adhesives such as animals, plants, minerals, and natural rubber. The inorganic binder has various chemical components such as phosphate, silicate, sulfate, borate and the like.
2) Classified by shape: can be divided into liquid adhesive and solid adhesive. There are solution type, emulsion type, paste, film, tape, powder, rubber, glue stick and so on.
3) Classification by use: This can be divided into structural adhesives, non-structural adhesives and special adhesives (such as high temperature resistance, ultra-low temperature, electrical conductivity, thermal conductivity, magnetic permeability, sealing, water bonding, etc.).
4) According to the application method: there are room temperature curing type, thermosetting type, hot melt type, pressure sensitive type, rewet type and other bonding agents. In order to meet the needs of cementing technology in industrial and agricultural production and social life, countries have made great efforts in developing adhesive varieties, and they have developed rapidly. Some fast curing, one-component, high-strength, high-temperature, solvent-free have appeared. Low viscosity, non-polluting, energy-saving, multi-functional and other adhesives.
In the field of synthetic adhesives, the use of molecular design to develop high-performance adhesives; the use of technology, copolymerization, blending, interpenetrating network polymer (IPM) and other technologies to improve the performance of adhesives. New progress has been made in the study of the adhesive mechanism; new developments have been made in the sizing equipment and tools. For example, the combination of adhesive and mechanical connection, adhesive and brush plating technology has formed a new composite repair technology. Since the 1980s, China's adhesive and adhesive technology has also developed rapidly, with increased varieties, increased production, and great quality improvement. Many adhesives have reached or even surpassed the world's advanced products. Here, Tiangong “super metal†repair agent is taken as an example to reflect the development of adhesive and bonding technology in China from one side. Tiangong “super metal†repair agent is a two-component composite material composed of high molecular polymer and metal powder, ceramic powder, fiber and curing agent, also called “polymer alloyâ€. It has excellent physical and mechanical properties, wear resistance and corrosion resistance. Its comprehensive index is comparable to similar foreign products; the varieties are general-purpose, wear-resistant, friction-reducing, corrosion-resistant, fast-curing, wet. Nine series of 26 kinds of repairing agents, such as surface repair type, high strength type and conductive type, can be adapted to the bonding and repair of different conditions and requirements. The application and effect of Tiangong “super metal†repair agent:
1) Application in equipment maintenance When equipment parts are worn, cracked, corroded, scratched, broken, and leaking, leaking or leaking in fuel tanks, water tanks, pipes, etc., they can generally be repaired by bonding technology. For example, TG103 steel repair agent is used to repair the 1000t fast forging machine imported from Germany by Beijing Shougang. The TC301 antifriction repair agent is used to repair the hydraulic cylinder of 215 dredger imported from Japan by Tianjin Waterway Bureau. The tank is repaired with TG801 high strength structural rubber. Gearbox bearing holes have been successfully used to repair chemical reactors with TG406 and TG416 corrosion-resistant repair agents, and have been well received by users. In Wuhan, we have the core components of the 1800t hydraulic press imported from Germany: the main plunger (diameter Φ879mm, length 3130mm) with severe wear (unilateral wear up to 1.5~2mm), guide bushing (diameter Φ875mm, length 500mm) ), pressure sleeve (diameter Φ876.5mm, length 210mm) for adhesive coating repair, repair cost is only 1 / 20 ~ 1 / 25 of the new product, and the repair time only took a few days, for the early production to fight for time.
For the sealing and sealing of oil storage, gas storage tanks and chemical equipment; for the breakdown of aluminum alloy, cast iron box, plastic and FRP parts. Using traditional welding, riveting, brush plating, thermal spraying and other methods is difficult to solve, we use Tiangong "super metal" repair agent to repair, have achieved satisfactory results. For example, the crankcase of the armored vehicle engine, the cracking of the aluminum alloy gearbox, and the leakage of the oil pipe, fuel tank, water pipe, radiator, etc. are repaired; the serious leakage of the heating equipment around the central TV tower is on the 4GC boiler of a certain factory. The perforation of the water pump pipeline was leaked, and the TG518 and TG528 fast repairing agents were used to repair the plugging, which were all successful.
2) Repair defective new parts and pre-coat protective layers of cast iron, cast aluminum and cast copper parts, often with casting defects, such as pores and trachoma, so that the scrap rate can reach 10-30% or even 50%. . In order to save parts with casting defects, TG101, YG111 iron repair agent and TG103 steel repair agent can be used to repair large defects of cast iron and cast steel. For small pores and sand eyes, TG102 iron repair agent can be used to fill; The defects of aluminum castings can generally be repaired with TG104 aluminum repair agent; for copper castings, repair with TG105 copper repair agent. Many factories use this sticky repair technology to make many castings come back to life and have good economic benefits. The TG406 and TG416 corrosion-resistant repairing agents are also used to pre-stick a layer of protective layer on the hovering ship's easily corrodible parts, which protects the parts and prolongs the service life.
3) Solving the difficult requirements in conventional machining, such as the stirring magnetic ring in the graphite emulsion pump, the precision is very high, and it is a ring-shaped part composed of a plurality of magnetic steels with N and S poles interdigitated. Since the magnetic steel cannot be magnetized after combination, each magnet must be separately magnetized, and the magnetization cannot be excessively processed after the combination, otherwise the magnetic properties will be greatly reduced. The magnetic steel has high hardness and is difficult to process. It cannot be solved by conventional mechanical processing. The combination of machining and bonding technology solves this problem well and smoothly processes the stirring magnetic ring that meets the technical requirements.
4) Expanding the scope of repair and bonding with other technologies, taking advantage of the length and complement each other, can fully utilize the characteristics of various technologies and expand the scope of repair. Such as: large cylinder liner or deep strain on the piston, can be filled with TG205 wear-resistant repair agent, and then coated with TG918 conductive repair agent, and finally brushed metal layer on the conductive repair agent by brush plating.
This is a combination of the adhesive coating technology and the brush plating technology, which can quickly fill the scratch and reveal the metallic color. Adhesive technology is compatible with mechanical reinforcement, spot welding reinforcement, glass fiber cloth reinforcement, etc. It can be used for sealing and sealing with temperature and pressure. For example, Jiamusi's aluminum alloy gearbox of the United States imported combine harvester was inadvertently broken. We used steel plate reinforcement and repaired with the adhesive to achieve the satisfactory effect. The rolling mill of Wuhan Iron and Steel Co., Ltd. was broken, using bonding and machinery. Reinforced and spot welded three technologies combined with repairs have also achieved success. Using the bonding repair technology, we have gained a lot of successful experience in the repair of many large-scale equipment and the repair of new product defects, and have obtained huge economic benefits, which have been well received and affirmed by users. For example, the large fan shaft of Beijing Fangshan Cement Plant and the bearing joints were severely bitten. The bearing repair was removed on site. It took only one day to reduce the downtime and save huge economic losses for the plant. Another example is the rotator in the ozone generator Roots blower of the Beijing Waterworks Repair Factory. The unilateral wear is up to 1mm, which seriously affects the fan pressure. It is directly coated and cured by the TG205 wear-resistant repair machine, and then mechanically processed, only a few hundred yuan. In 2 days, all three rotators were repaired, and significant economic benefits were achieved.
From the above-mentioned examples of the use of Tiangong "supermetal" repair agent bonding repair, it can be confirmed that the bonding technology has the functions of time saving, labor saving, energy saving, material saving and capital saving in the application of industrial equipment maintenance and repair of new product defects. With very strong development potential, it will play an increasingly important role in the construction of various parts of China's national economy.