China Xiamen Juguangli Import & Export Co., Ltd Company News

Types of silicone sealing coils In a broad sense, silicone sealing coils are supporting parts of wiring equipment, also known as sealing sleeves or sealing rings. Although silicone sealed coils are an important part, they play an important role as a small supporting part. Very small, there are countless species in production and daily life. The type of silicone sealing coil is primarily classified based on material and appearance.   Silicone sealed coils are classified according to their raw materials: 1. PVC coil is primarily made of elastic PVC material. The sealing sleeve of the product is injection molded, and the end face has a clear interface, which has a certain impact on the appearance of the product. PVC rolls are more suitable for low-end products due to their low price and poor quality. Due to inability to meet job requirements, the product is no longer available. 2. Silicone sealed coils are made of silicone through high-temperature vulcanization. Silicone materials, due to their unique physical functions, determine the excellent functionality of silicone sealing coil products, both in terms of appearance and physical function, making them the best choice for producing silicone sealing coil products. There are many types of silicone materials used in the production of silicone maintenance coils. The commonly used ones now include natural rubber, nitrile rubber, fluororubber, and silicone rubber. Customers can customize silicone sealing coils with different rubber materials according to their product requirements to meet the requirements of the application environment.

The common material of the car dust cover is silicone rubber, and the car rubber dust cover generally has the outer rubber dust cover (CVJ rubber dust cover) and the internal test rubber dust cover, the shape is basically into the corrugated pipe shape (as shown in the following figure), CVJ rubber dust cover is used to protect the car drive shaft rubber parts; It can be imagined that the rubber dust cover is very important to the car.   Is it really reliable to use TPE-E instead of rubber CVJ dust cover? At present, the CVJ rubber dust cover is widely used because: it can adapt to harsh environments, such as: it can maintain the original compressive elasticity at extreme temperatures of -40 degrees Celsius; There will be no qualitative change in the extremely corrosive environment such as oil, sand, dirt, and exhaust, so as to achieve normal and safe driving under various turning and braking conditions of the car.   Although the TPE-E replacement of CVJ rubber dust cover reduces the cost to a certain extent (by reducing the size of the bellow, that is, reducing the use of materials to reduce the cost), it is also worth mentioning that the composition of the automobile drive shaft assembly is mainly steel parts and dust cover, in order to reduce the cost must take into account the cost of lubricating materials. However, the use of TPE-E will use the bellows to become larger, if the size of the bellows is reduced, coupled with the dust cover of TPE-E material has resistance to the grease, so that the grease is not easy to pass, resulting in the possibility of failure. Secondly, the corrosion resistance of CVJ rubber dust cover is beyond the reach of TPE-E. For rubber dust cover, it has poor blocking performance of grease, and the grease inside can quickly pass through the dust cover, and play a lubricating role on the surface.   To sum up, The importance of rubber dust cover for the car is to choose the lubricant suitable for the rubber dust cover, so that the surface is lubricated, and choose the material suitable for the car dust cover, this problem still needs to be improved.

The shortcomings and shortcomings of EPDM rubber are as follows:   1. Adhesive side Although ethylene propylene rubber has become the most widely used elastomer in the field of non-tire products, it still cannot play a role in the production of tire products. The reason is that as long as the self-viscosity and mutual viscosity of ethylene propylene rubber is poor, it is easy to cause tire delamination. This problem is also one of the biggest problems in the application of ethylene propylene rubber.   2. The price of raw rubber At the beginning of the birth of ethylene propylene rubber, rubber people have given high hopes, because of its low monomer makes some people predict that it will become the largest amount of rubber, the lowest cost rubber. But today, the price of ethylene propylene rubber raw rubber is still higher than originally expected, and belongs to the higher of its large synthetic rubber (although its price is lower than nitrile rubber and neoprene rubber, but higher than styrene butadiene rubber, butadiene rubber, isoamyl rubber and butyl rubber).   3. Curing rate Binary ethylene-propylene rubber molecular chains are fully saturated and do not contain highly active double bonds, so so far it is still unable to be cross-linked by sulfur vulcanization, and can only be vulcanized by peroxides with slower vulcanization, thus limiting the application of this valuable elastomer.   4. Other aspects The flame retardant, oil resistance and air tightness of ethylene propylene rubber are also poor. Therefore, ethylene propylene rubber can not be used alone in mineral oil, hydrocarbon solvent products; When used for flame retardant products, it is also necessary to add more flame retardant fillers than other elastomers, so the cost is higher and the flame retardant effect is poor; When combined with butyl rubber and used as an inner tube, the air tightness of the butyl rubber inner tube will be partially reduced, so the use is limited.

If you want to change the size of tempered glass because of the change of use, many people want to know how to cut. So, can the tempered glass be cut again? What is the cutting step of glass, and how to cut correctly can have good results.   Can tempered glass be cut?   1, once the tempered glass is completed, it can not be cut, drilled or formed. This is because tempered glass is specifically designed to distribute pressure and will crack and break if the tension inside the glass breaks. Therefore, any tempered glass unit must be cut to size and shape before the toughening process can take place.   2, if the float glass is broken, it will break very sharp, dangerous glass fragments. However, the process of toughening creates tension within and on the surface of the glass panel to increase its strength and durability. This also ensures that if the glass breaks, small, harmless pieces of glass will be broken.   What are the steps for cutting glass?   1. Prepare the workspace. You need a large flat table that is too hard to scratch this piece of glass. Work area should be easy to clean. Because of the possibility of glass fragments, it is best to avoid working on the carpet. To keep pets safe and children safe, make sure work areas and materials are kept away from them. Clean the surface of the glass you are going to cut. Any stains and irregularities on the glass will prevent you from making scratches on it. Use a rag or your fingers to clean the area you want to scratch.   2. Prepare a glass cutting knife and some low viscosity oil. The glass cutter is about the same size as a pencil and uses a diamond or hard grinding wheel to scratch the glass, so that the glass can be divided along the scratch. You can buy cutting oil at a hardware store or use some kerosene.   3. Measure and mark where you want to scratch. The scratch must go from one edge to the other. You can mark the glass with a marker (or ruler if you're cutting straight lines). You can also mark with paper and lay the paper under the glass. The cutting length should not be too long. Scratches larger than 60 cm increase the risk of glass shattering. Make sure the scratch line leaves an edge of about 15cm on either side to allow room to grip. If you are cutting small pieces of glass, you may need special tools, such as pliers or a small hammer, to knock off glass that you cannot grasp with your hands.   4. Mark the glass, dip the cutter into the oil, and hold it like a pencil. The oiled glass cutter makes smooth lines. Make sure to check that the grinding wheel is aligned to your desired position and orientation. Calibrate. You can use a yardstick or a regular yardstick. You want to make sure the ruler is thick enough to prevent it from colliding with the grinding wheel on the cutting knife.   The above for you to introduce is whether the tempered glass can be cut, presumably people should already know it, what is the cutting step of tempered glass, please professional personnel to cut it will be better, at the same time for the choice of tempered glass, we must pay attention to the brand, in order to better ensure the quality, for tempered glass also to do maintenance, Can extend the service life.

Most materials can withstand the initial pressure, but will yield over time due to creep and relaxation. The reading of the hardness tester can be read immediately or after a specific delay time, usually 5 to 10 seconds. An instant reading will always show a higher (or harder) reading than a delayed reading. The delayed reading is more representative not only of the hardness of the material but also of its elasticity. A weaker, less elastic material is more prone to creep than those that are stronger and more elastic.   In order to ensure the validity of the data, it is necessary to have precise testing procedures. In order to obtain accurate readings, you must have a specimen with a flat surface and a thickness that prevents the indenter from being affected by the supporting surface. The required thickness is usually 0.200 inches, but for hard materials with less deformation, it can be tested accurately when the thickness is thinner.

Rubber materials, with their superior properties, are increasingly being approached by businesses, especially in terms of compression resistance, heat resistance, and so on. The special components contained in high-temperature resistant rubber can provide good performance in the power industry and also play an important role and trend. Low phenyl silicone rubber not only has unique cold resistance and low cost, but also is a type of low temperature resistance, widely used in the aerospace industry today. According to the different content of benzene, it can be divided into medium phenyl silicone rubber, high phenyl silicone rubber, and low phenyl silicone rubber. Due to the increase in phenyl content, the rigidity of high phenyl silicone rubber gradually increases, and its low-temperature resistance gradually decreases. However, to a certain extent, it improves the flame resistance and radiation resistance of the vulcanized rubber. And medium phenyl silicone rubber has good flame resistance and can automatically extinguish after ignition. This high-temperature resistant silicone rubber is one of the important materials for advanced technology, national economy, and aerospace industry. It can be made into various molded and extruded products for use as cold resistant rubber in the aviation industry. It can also be used for sealing rings, gaskets, pipes, and bars in radiation resistant parts, or in areas such as erosion resistance and heat aging resistance. So it's natural for people to come into contact with such products, and we also believe that rubber products will continue to progress and gradually enter thousands of households, making contributions to more industries. http://mao.ecer.com/test/siliconerubber-keypads.com/sale-22036759-shock-proof-and-shock-absorbing-silicone-rubber-feet-pad-for-washing-machine.html

General silicone rubber products and metal adhesion is not good, are required to be treated on the metal surface   1, metal surface treatment: In order to obtain the best bonding effect, the metal surface must be clean and pollution-free. With 200-400 micron steel sand or brown corundum for sandblasting treatment, until the metal surface is gray. Recommended products: Hardware bag rubber   2. After sandblasting, degreasing with solvent to remove grease. Cold rolled steel is usually treated with steel sand, stainless steel, aluminum, copper, etc., with brown corundum (aluminum oxide). Phosphating can also be used.   Summary: Make holes, knurls, grooves in the bonding area, and use adhesive Kemlock (dry for 20 to 30 minutes). About the adhesive coating process, I think everyone should be very clear, really do not know can go to ask about the use of Chemlock, their company will teach you to use the treatment agent and the use of methods.

Over the past few decades, the range of heat-resistant rubber products has been expanding, because:   First, some traditional products did not require heat resistance in the past, and with the change of use conditions, heat resistance requirements have been put forward. A classic example is tires. Due to the acceleration of the vehicle speed, the rolling heat generation rises sharply, and improving the heat resistance is the threshold that must be crossed. Other rubber products have a similar situation.   Second, the contact between rubber products and various thermal media (such as various lubricating oil, brake oil, working media and hydraulic oil) increases, and the temperature is also much higher than normal temperature.   Third, in order to comply with the heat resistance needs of the rubber industry itself in processing, such as tire vulcanization of water tires, capsules need to be used at a temperature of 170°C ~ 180°C for a long time, continuous vulcanization of extruded products must be carried out at a high temperature of more than 200°C, they must have heat resistance and anti-retrograde characteristics.   The formulation design of heat-resistant rubber involves the correct selection of the main material, vulcanization system, protection system and anti-retrograde agent, as well as the coordination between them.

Fluorine silica gel has outstanding high temperature resistance, oil resistance, especially resistance to double ester oil, chemical resistance, good physical and mechanical properties, satisfactory dielectric properties, non-flammability, weather resistance, excellent vacuum properties, radiation resistance; It can usually be used for a long time at 275℃ and for a short time at 320℃. Oil resistance, acid resistance is better than 1# glue; Weather resistance, ozone resistance, radiation resistance, gas permeability and electrical properties and fire resistance are similar to 2# adhesive. It is widely used in aerospace, automobile, machinery, petrochemical and other fields. For example, it is used as a dynamic and static sealing material for hydraulic systems and lubrication systems of aircraft; Used as sealing materials for oil fields, oil cables and pipelines for oil fields and drilling equipment; The chemical industry is used as the lining of equipment, pipeline flexible connections, pumps, etc., or as a corrosion-resistant sealing material, and is made of pipes to transport or organic solvents or other corrosive media.   Compared with methyl vinyl silicone rubber, fluorine silicone rubber has excellent oil resistance, solvent resistance and chemical resistance. Even compared with fluorine rubber, oil resistance and solvent resistance are good. After impregnation in the same medium, temperature and time, it shows excellent durability, it can be said that fluorosilicone rubber is the only kind of elastomer resistant to non-polar media at -68℃ ~ 232℃. The resistance of fluorine silicone rubber to methanol containing gasoline is also relatively good, even in the gasoline/methanol mixed system, the hardness, tensile strength, volume changes of its vulcanized rubber are very small, after 500h long time impregnation test, the physical properties are almost unchanged.   The high-temperature decomposition of fluorine silica gel is the same as that of silicone rubber, that is, side chain oxidation, main chain fracture, side chain thermal decomposition and causing various complex reactions. Since the decomposition products can also cause the main chain to break, the heat resistance is usually worse than that of silicone rubber, and oxidation aging has begun at a temperature of 200 ° C. However, by adding a small amount of heat stabilizer such as iron, titanium, rare earth oxides, it can be significantly improved, and it has sufficient heat resistance even at 250℃ high temperature. The effect of temperature on fluorosilicone rubber is larger than that of silicone rubber, but smaller than that of fluororubber.   The weather resistance of fluorine silica gel is very good, even after 5 years of exposure, it still has good performance. Ozone is one of the most formed gases during the aging of elastomers, but no cracking or cracking phenomenon was found in fluorosilicone rubber after dynamic or static tests. In addition, fluorine silicone rubber mildew resistance, physiological inertia, anticoagulation is also very good. Fluorine silicone oil is resistant to olive oil, safflower oil, makeup remover oil, lubricating oil, brake oil, hydraulic oil and other inorganic, organic, polar, non-polar oils, no expansion, no contraction, stable size, oil resistance effect lasts a long time.   Fluorine silica gel is mainly used for the preparation of heat, oil and acid resistant rubber products. Such as seals, hoses, rubber pads and so on. The product can be used for a long time at 250 ° C and for a short time at 300 ° C. Its oil resistance is better than other varieties of fluorine rubber, and it can be used for parts that need oil resistance. Examples are as follows: Used as "○" ring, V-type sealing ring, oil seal bowl with metal skeleton, valve gasket, etc. These sealing materials can work for a long time at 200 ~ 250 ° C and for a short time at 300 ° C. In the petroleum industry: F26 rubber seals are used in drilling machinery refining equipment, natural gas desulfurization equipment, can withstand high temperature, high pressure, oil and strong corrosive media and other harsh conditions. In the chemical industry: F26 seals are used in pumps, pipe fittings and equipment containers to seal chemical substances such as inorganic acids and organics. In terms of building materials manufacturing: F26 can be used as cement single bin pump sealing rubber ring, which is about 10 times longer than the sealing ring made of natural rubber.

Glass screen printing has been widely used in China, due to the wide variety of ink on the market, the glass matrix also has its diversity, the printing process often has some problems. The following is a summary of the problems in the process of glass screen printing, and the solution to the problem of glass screen printing.   First, paste plate:   Paste plate, also known as blocking plate, refers to the phenomenon that the through hole part of the screen plate can not transfer the ink to the substrate in the printing. The appearance of this phenomenon will affect the printing quality, and even the normal printing will not be possible in serious cases. The reasons for the phenomenon of pasting produced in the process of screen printing are complicated. The reasons for paste can be analyzed from the following aspects: (1) The reason for the glass: the glass surface is not treated clean, and there are watermarks, paper prints, mimeograph prints, handprints, dust particles and other dirt. Thus resulting in paste plate; (2) Reasons for workshop temperature, humidity and ink properties. Screen printing workshop requires to maintain a certain temperature of about 20 ° C and relative humidity of about 50%, if the temperature is high, the relative humidity is low, the volatile solvent in the ink will quickly evaporate, the viscosity of the ink on the screen becomes high, thus blocking the mesh. (3) The reason for the screen printing plate. The finished screen plate can be used after rinsing with water and drying before use. If it is placed too long after making a good version, it is not printed in time. In the preservation process more or less will adhere to the dust, if not cleaned when printing, it will cause paste. (4) The cause of printing pressure. During the printing process, the printing force is too large, which will bend the scraper, and the scraper is not in line contact with the screen printing plate and the glass, but is in surface contact, so that each scraping can scrape the ink clean, leaving the residual ink, and after a certain time, the conjunctiva will cause the paste plate. (5) The reason for improper gap between the screen plate and the glass. The gap between the screen plate and the glass can not be too small, the gap is too small after scraping the screen plate can not be timely out of the glass, when the screen plate is lifted, the bottom of the plate is glued to a certain ink, which is also easy to cause paste board. (6) The reason for the ink, in the printing process, the ink viscosity increases resulting in paste plate, because the ink solvent on the screen plate evaporates, resulting in increased ink viscosity, and the phenomenon of sealing the screen. The second is the fluidity of the ink, poor fluidity will make the ink in the screen when it does not produce paste.   Second, pinhole phenomenon   The pinhole phenomenon is the most headache for the staff engaged in glass screen printing. Pinholes occur for a variety of reasons, many of which are currently unexplained, and pinholes are one of the most important inspection items in the inspection of printed products. The causes of pinhole phenomenon are: (1) Dust and foreign matter on the plate. When making plates, some sol will be mixed into the washing development. If dust and foreign matter are attached to the screen plate, blocking the screen plate opening will also cause pinhole phenomenon. Before the formal printing, to carefully check the screen plate, eliminate the dirt on the plate; (2) The glass surface is not cleaned. The glass plate should be pre-treated before printing to make its surface clean and printed immediately. Pay special attention to when moving the glass by hand, the fingerprint of the hand will also be attached to the printing surface, and the pinhole will be formed when printing. The main reason for the emergence of bubbles is that the printing material is poorly treated before printing, which may be caused by substances such as dust and oil stains attached to the surface of the substrate, or by bubbles in the ink. (3) Too fast or uneven printing speed will also produce bubbles. The printing speed should be properly reduced to maintain the uniformity of the printing speed.   Three, the graphic part and the dark part appear speckled   Ink refers to the appearance of blotchy marks on the graphic part and the dark part of the glass surface, which damages the printing effect. Glass screen printing is easy, resulting in this phenomenon. (1) Printing speed and ink drying is too slow (2) The ink layer is too thin and the ink thixotropy is large (3) The influence of static electricity The pigment dispersion in the ink is poor, because of the polarity of the pigment particles, the particles agglutinate with each other, and the color blotches appear. Improved method 1. Improve ink fluidity 2. Use a quick-drying flux 3. As far as possible, use high viscosity ink printing, increase the thickness of the wet film of the ink, and try to use ink made of pigments with small oil absorption to minimize static The effect of electricity. 4. When the image is deformed, the printing pressure added to the printing plate by the scraper can make the line contact between the printing plate and the printed object, and do not exceed. Printing pressure is too large, the plate and the substrate inside contact, will make the screen telescopic, resulting in deformation of the printed image. Screen printing is a kind of printing with the smallest printing pressure in various printing methods. If the pressure cannot be printed without increasing the pressure, the gap between the plate and the glass surface should be reduced, so that the pressure of the scraper can be reduced.