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

The main chain of silicone rubber is composed of Si-O-Si chain links, with large Si-O-Si bond energy, high temperature resistance and good performance; the side chain is an organic group with large bond angles, large orientation freedom, and good flexibility. Has excellent low temperature resistance.   Damping mechanism of silicone rubber When the polymer viscoelastic material is subjected to stress and strain, the bent molecular chains will undergo deformation such as stretching and bending, and twisting and slippage between the molecular chains will also occur. After the external force disappears, the elastic part restores part of the molecular chain to the original position, while the viscous part prevents the slippage between the chain segments from being completely restored, resulting in permanent deformation, causing part of the energy to be consumed in the form of heat.     Application of silicone rubber damping material Silicone rubber has stable mechanical and damping properties in a large temperature range, outstanding high and low temperature resistance and aging resistance, and can adapt to the working environment of aerospace products. With the emergence of new high-damping silicone rubber and the application of new blending technology, silicone rubber is gradually replacing butyl rubber as the first choice in aerospace damping and vibration-damping structures.   The researchers used phenyl silicone rubber as a matrix, added polyaniline coated lead titanate (PZT) and conductive carbon black to prepare a silicone rubber composite piezoelectric damping material. This kind of material is also called intelligent damping silicone rubber. It has excellent electrical conductivity. When a certain amount of charge appears on the surface of PZT, polyaniline can collect more charge and transport the charge to the carbon black conductive network. Improve the efficiency of charge transfer.   I believe that with the development of science and technology, more and more silicone rubber damping materials will be used in our lives.

The automobile industry is the largest market for rubber consumption. The amount of rubber consumed accounts for 70% of the rubber market. Among them, the rubber consumption of tires accounts for 60%. The other 40% is other rubber products. It is also the automobile rubber products that account for a large proportion of the 40% rubber accessories.       We know that the reason why a car will run is because the combustion of fuel converts chemical energy into mechanical energy, and then the mechanical energy pushes the piston to reciprocate, and then transmits this power to the wheels, and then the car starts to move. In this process, the internal combustion engine is The essential.   The internal combustion engine fuel requires oxygen, but the cylinder is airtight and airtight. Of course, air is sent in. The function of the intake pipe is to transport air into the cylinder, but it is not as simple as sending air in directly.   If the air contains dust or sand, it will cause irreversible damage to the cylinder. Therefore, before the air reaches the cylinder, there is a filter to filter impurities. The next step is to reach the cylinder. The section of the pipe from the air inlet to the filter and then to the cylinder is called the intake manifold.   The next step is to deliver air into the cylinder, but since there is more than one cylinder in the car, if you want to evenly distribute air into the cylinder, you need to use multiple pipes. This pipe has a professional name: intake manifold.         Different types of cars have different shapes and lengths of air intake pipes. There are vertical and revolving types, which are mainly caused by the positioning of the car. For example, sports cars or off-road vehicles generally use vertical air intake pipes, while ordinary family cars The swirling type is used. The difference between the two is that the former has higher power requirements for the engine, while the latter mainly considers emissions and economic applicability. Why do you say that, because the swirling intake pipe makes it easy for air to enter the duct Swirl flow is generated, and the generation of vortex flow is beneficial to improve the mixing degree of air and fuel. Finally, the increase in mixing degree improves the combustion efficiency, which is the so-called fuel saving.   We are a professional silicone rubber manufacturer with more than 15 years of experience in silicone rubber production. We can provide customers with comprehensive solutions from mold development to silicone rubber product manufacturing. Please feel free to contact us.        

Ordinary silicone rubber raw materials contain precipitated substances, and their color usually presents a translucent or milky white color. Silicone rubber products have three major properties that we need to understand. Today, I will briefly introduce what are the three major properties of silicone rubber products.   ​   1. High temperature resistance The most notable feature of silicone rubber is its high temperature stability and can be used for a long time in an environment of 250℃~300℃. If appropriate silicone rubber fillers and silicone rubber high-temperature additives are selected, the use temperature can be as high as 375℃ and can withstand instantaneous high temperatures of thousands of degrees. It is estimated that the service life of silicone rubber can be up to 20 years at 120°C and 5 years at 150°C, and it is not easy to age.   2. Low temperature resistance flexibility Silicone rubber products have inherent low-temperature flexibility. Silicone product processing or other synthetic rubbers have a low embrittlement point. Silicone rubber generally can work normally at low temperatures of -50℃ to -60℃.   3. Breathability Silicone rubber film has good air permeability. The air permeability at room temperature to air, nitrogen, oxygen, carbon dioxide and other gases is 30-50 times higher than that of natural rubber.    

What are the differences between EPDM rubber and silicone rubber? First of all, EPDM rubber is a terpolymer of ethylene, propylene and non-conjugated diene. Diene has a special structure, and only one of the two bonds can be copolymerized, and the unsaturated double bond is mainly used as a cross-chain. The other unsaturated one will not become the main polymer chain, only the side chain. The main polymer chain of EPDM is fully saturated. This feature makes EPDM resistant to heat, light, oxygen, and especially ozone. EPDM is essentially non-polar, has resistance to polar solutions and chemicals, has low water absorption, and has good insulation properties.     Silicone rubber is classified into two types: hot vulcanized silicone rubber and room temperature vulcanized silicone rubber according to its vulcanization characteristics. According to the performance and use, it can be divided into general type, ultra low temperature resistant type, ultra high temperature resistant type, high strength type, oil resistant type, medical type and so on. According to the different monomers used, it can be divided into methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorosilicone, nitrile silicone rubber, etc.     However, silicone rubber has excellent heat resistance, cold resistance, dielectric properties, ozone resistance and atmospheric aging resistance. The outstanding performance of silicone rubber is that it can be used at a wide temperature range from -60°C (or lower temperature) to Long-term use at +250°C (or higher temperature).   However, silicone rubber has poor mechanical properties such as tensile strength and tear strength. Its physical and mechanical properties are not as good as most synthetic rubbers at room temperature. In addition to nitrile silicone and fluorosilicone rubber, general silicone rubber is resistant to oil and solvents. The performance is not good, so silicone rubber is not suitable for occasions under ordinary conditions, but it is very suitable for many specific purposes.

Recently, the Ministry of Commerce, the General Administration of Customs, and the Ministry of Ecology and Environment jointly announced the Catalogue of Prohibited Import Goods (Seventh Batch) and the Catalogue of Prohibited Export Goods (Sixth Batch), which will be implemented on January 1, 2021. Import and export of 35 chemicals such as chlordane, mercury-containing disinfectants, mirex and pentachlorobenzene are prohibited. On October 27, 2017, the World Health Organization's International Agency for Research on Cancer released the list of carcinogens, Chlordane is a category 2 carcinogen It is reported that the publication of this list is to implement the "Stockholm Convention on Persistent Organic Pollutants" and the "Minamata Convention on Mercury."

Global Silicone Network News on January 7 In many professional car modification companies in Guangzhou and Shenzhen, we can see that silicone synthetic leather is opening a new window in the domestic automotive interior decoration field, choosing silicone synthetic leather to modify seats and refit Car decorations have become a big hit, indicating that a feast of innovative applications of silicone is coming!   In recent years, the attention of environmental protection and functional synthetic leather products has increased day by day. At the same time, the market is undergoing earth-shaking changes. As a new environmentally friendly high-performance synthetic leather solution, organic silicon synthetic leather is unique after water-based synthetic leather, solvent-free synthetic leather, and TPU synthetic leather. With its uniqueness, it opens a new window for my country's synthetic leather innovation.   Organic silicon synthetic leather is a new type of environmentally friendly leather, using silica gel as the raw material. This new type of material is combined with ultrafine fibers, non-woven fabrics and other substrates to be processed and prepared, and is suitable for various industrial applications. Organic silicon synthetic leather adopts solvent-free technology, and organic silicon is coated and bonded on various substrates to make leather. It belongs to the new material industry developed in the 21st century.    

Apple Car will debut next September? Suppliers have broken orders... or will drive the demand for related silicone products.     According to a Reuters report on December 22, people familiar with the matter revealed that Apple is advancing the development of self-driving car technology and plans to launch and produce a passenger car in 2024, which may include self-developed breakthrough battery technology.   According to Taiwanese media citing unnamed executives of the local manufacturer, the long-rumored Apple electric car will run at least two years earlier than originally planned and will be released in the third quarter of 2021.   Apple concept car circulating on the Internet       According to reports, Apple recently put forward stocking requirements to Taiwanese auto parts companies such as Heda, BizLink-KY, Heqin, and Tomita, and included related companies in the first wave of supply chains. In response to AppleCar stocking needs, major manufacturers such as Heda and BizLink have all burst orders. In addition, Apple is currently testing new automotive products, and it is said that Apple has secretly tested dozens of prototypes on the road in California.   In fact, Apple has been planning to "build cars" for a long time. Many silicone gods said that in recent years, the application of silicone products to new energy vehicles has grown by leaps and bounds, with an annual growth rate of more than 100%.

The total volume of shipments of the global silicone rubber products market reached a record high this year, and the annual growth rate is estimated to be 8.3% for the whole year. According to the industry, the silicone rubber products industry may usher in the opportunity of rapid development. The industry continues to be optimistic about the rapid development of silicone rubber products and upstream and downstream industries, and the demand growth trend is expected to slow down until 2025.   The latest monitoring data shows: this year's shengjiao roller-coaster market, from the start of the rapid rise at the end of August, after four months to reach the highest price of 35,000 yuan/ton, in mid-December quickly fell to today's main enterprises reported 23,000 yuan/ton, a drop of as much as 12,000 yuan per ton, trade holders of large losses.Historical data shows: now is the opportunity to restock in the middle and lower reaches.   Public information shows that a number of upstream enterprises have received further notification of normal off-peak production.Promote the normalization of industrial production area and time, and the time is from December to March 10 of the next year.

Carbon black is an amorphous carbon. It is a light, loose and extremely fine black powder with a very large surface area ranging from 10~3000m2/g. It is a carbonaceous material (coal, natural gas, heavy oil, fuel oil, etc.) that undergoes incomplete combustion under insufficient air conditions. Or the product of thermal decomposition. It can be used as a black dye, used to make Chinese ink, ink, paint, etc., and also used as a reinforcing agent for rubber.     1. Conductive carbon black Conductive carbon black has two physical forms, powder and granular. The product has the characteristics of low resistance, high conductivity, easy dispersion, small addition amount, and stable quality. It is suitable for conductive applications in various different industries, such as antistatic and lithium battery products.     2. Pigment Carbon Black Pigment carbon black has two hues, red phase and blue phase, and two physical forms of powder and granules. It has the characteristics of high blackness, high coloring, high dispersion, and stable quality. It is widely used in color masterbatches, paint inks, rubber, Plastic, wire and cable, leather, color paste, powder coating, paper, construction and other industries.   3. Acetylene carbon black Acetylene carbon black has the characteristics of high purity, high structure, low resistance, low ash content, low volatile content, and stable quality. It is mainly used for batteries as electro-absorbent fluid, and also used for conductive, antistatic and thermal conductive rubber products, as well as conductive coatings, plastics In production.   4. Insulating carbon black Insulating carbon black has the characteristics of ultra-high resistance value, high blackness, high coloring, easy dispersion, stable quality, etc., and can be used for high-quality printing and copying inks, high-insulating plastics, synthetic fibers, insulating rubber and other insulating products.   5. Spray carbon black Spray carbon black is a large particle size, high structure furnace carbon black with a particle size of 100~130nm. It is mainly used as a reinforcing filler for rubber. This product can be filled in a large amount of rubber with good processing performance. Extrusion search is small. Vulcanized rubber has high elasticity, low heat generation, small deformation, good low temperature performance, high tensile stress, but low tensile strength and elongation rate.   6. Metallurgical carbon black Metallurgical carbon black is an important raw material for the metallurgical industry. It is developed on the basis of improving the production process of natural gas semi-reinforcement and furnace black. It is mainly used as a carbon matching material in the cemented carbide smelting process, and can also be used as a graphite tube Furnace materials for resistance furnace.   Others include lamp smoke carbon black, mixed gas carbon black, water-soluble carbon black, rubber carbon black, building material carbon black, channel carbon black and other varieties.        

Fluorosilicone rubber is a silicone elastomer with side chain modification. Common products made of fluorosilicone rubber not only have the characteristics of general silicone rubber, but also have excellent oil resistance, including fuel, engine oil, chemical reagents and solvents. Therefore, fluorosilicone rubber makes up for the lack of oil resistance of ordinary silicone rubber, and can be called the "oil fighter" in silicone elastomers.   Compared with methyl vinyl silicone rubber, fluorosilicone rubber has excellent oil resistance, solvent resistance, and chemical resistance. Even compared with fluoro rubber, it has good oil and solvent resistance. After being immersed in the same medium, temperature and time, it shows excellent durability. It can be said that fluorosilicone rubber is the only elastomer that is resistant to non-polar media at -68°C to 232°C.     Fluorosilicone rubber has better resistance to methanol-containing gasoline. Even in a gasoline/methanol (85vol% / 15vol%) mixed system, the hardness, tensile strength and volume change of the vulcanized rubber are very small. After a long time of 500h After the immersion test, the physical properties hardly changed.   Heat resistance The high-temperature decomposition of fluorosilicone rubber is the same as that of silicone rubber, that is, side chain oxidation, main chain fracture, side chain thermal decomposition and cause a variety of complex reactions.Because the decomposition products also cause the main chain to break, the heat resistance is usually a little worse than that of silicone rubber, which has begun to oxidize and age at 200℃.However, by adding a small amount of heat stabilizer such as iron, titanium and rare earth oxide, it can be significantly improved and has sufficient heat resistance even at 250℃. The influence of temperature on fluosilicate rubber is greater than that of silicone rubber, but less than that of fluorosilicate rubber.The service life of fluorosilicone rubber at 150℃×2000h, 175℃×5000h and 200℃×4000h were also studied abroad, and the result was second only to methylvinyl silicone rubber.   Cold tolerance Fluorosilicone rubber and ordinary silicone rubber, low temperature performance is good.Because fluorosilicone is a linear high polymer with soft Si-O main chain, its low temperature property is better than that of Fluorosilicone with C-C main chain.Among them, the low temperature characteristic of fluorosilicone rubber (LS-2370U) is better, and the brittle temperature is as low as -89℃, while the general fluorosilicone rubber is about -30℃.   Electrical and radiation resistance The electrical properties of fluorosilicone rubber are similar to those of ordinary silicone rubber, but the special value is that the changes in high temperature, low temperature, humidity, oil, solvent, chemicals, ozone and other harsh conditions are very small. The radiation resistance of fluorosilicone rubber is not outstanding, but the radiation resistance of fluorosilicone rubber is better than that of methyl vinyl silicone rubber.   Physico-mechanical properties Like common silicone rubber, the mechanical strength of vulcanized rubber (especially tear strength) is relatively low.Therefore, to improve and improve the strength of fluorosilicone rubber is also an important research topic.   Weather resistance Fluorosilicone rubber is very resistant to weathering and retains good performance even after 5 years of exposure.Ozone is one of the gases generated most when the elastomer is aging, but no cracking or cracking has been found after the dynamic or static tests of fluorosilicone rubber.   The application of fluorine silicone Because of its excellent performance, fluorine silica gel has been used in many fields. 1. Automobile industry: all kinds of vehicles, turbocharged pipe, extrusion strip, sealing ring, oil seal, diaphragm, conduit, valve lining, etc. 2. Petrochemical industry: all kinds of high temperature, low temperature, chemical resistance to the erosion of pumps, valves, oil tanks and other equipment sealing products. 3. Aviation industry: seals and contacts that are resistant to fuel oil and lubricating oil on aircraft, such as various O-rings, fillers, sealing rings, sensor materials, diaphragms and gaskets. 4. Medical care: used for medical devices and artificial organs, such as medicinal catheter, drainage tube, artificial valve, etc. 5. Military industry: low temperature/oil/acid resistant harsh environments, e.g., fluid bellows for hydraulic systems of military aircraft, doors and Windows/rear cover seals for special vehicles, sensing materials for sensors.