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

Dow signed a memorandum with the Management Committee of Zhanjiang Economic and Technological Development Zone, planning to establish a South China specialty chemicals manufacturing base for Dow to provide customers with high value-added products and innovative technologies produced locally by Dow.   According to the memorandum, Dow will invest about 250 million U.S. dollars to build special polyurethane and special surfactant devices, with a total production capacity of about 250,000 tons. The planned South China manufacturing base will effectively improve Dow's local production capacity, further improve supply reliability, accelerate market demand response, and strengthen customized innovation to help customers in automotive, pharmaceutical, cleaning, clothing, lubricants, and adhesives Wait for the market to succeed. The base also reserves space for future growth and development.

According to the Ministry of Industry and Information Technology: In 2020, my country's industrial added value will reach 31.31 trillion yuan, ranking it as the world's largest manufacturing country for 11 consecutive years. In 2020, the growth rate of new energy vehicles reached 10.9%, and showed a continuous growth trend; production and sales volume ranked first in the world for 6 consecutive years, with a cumulative sales of 5.5 million vehicles.   By the end of 2020, my country had opened a total of 718,000 5G base stations, and the number of 5G mobile phone terminal connections exceeded 200 million. These have driven the rapid development of the silicone industry chain.

The recent financial report released by the German pharmaceutical and agrochemical giant Bayer shows that, mainly due to legal litigation and other factors, Bayer has a net loss of approximately 10.5 billion euros in 2020, a record loss. In June 2020, Bayer reached a series of settlement agreements with the US plaintiff in a civil lawsuit involving the herbicide produced by its subsidiary Monsanto that may cause cancer and damage crops. Bayer also compensated Monsanto's involvement in environmental lawsuits in the United States for the toxic chemical PCBs produced by Monsanto. The compensation paid to Bayer caused losses in excess of US$10 billion. The financial report shows that Bayer's sales revenue of 41.4 billion euros in 2020, a year-on-year decrease of 4.9%. Bayer CEO Werner Bowman pointed out that Bayer reached more than 20 mergers and acquisitions or cooperation agreements in the pharmaceutical business last year. In the future, it will continue to promote corporate transformation, broaden product pipelines, and invest in new technologies. Bayer, headquartered in Leverkusen, Germany, has 750 production plants in 200 locations on six continents; it has 120,000 employees and 350 branches, almost all over the world. Polymer, medicine and health care, chemical industry and agriculture are the company's four pillar industries. The company's product categories exceed 10,000. On June 7, 2018, Bayer announced the completion of the acquisition of the American biotechnology company Monsanto, and Monsanto shareholders received a compensation of $128 per share.      

It is reported that Dow Chemical intends to sell its infrastructure assets in Germany and will sell its petrochemical plant infrastructures in Stade, Schkopau and Boehlen. It has been included in a potential transaction valued at 800 million euros (96 million US dollars). The company will use the cash from asset sales for investments elsewhere.     777 CEO James Fitterling said last month that Dow will continue to divest its infrastructure companies and use the proceeds from the sale for capital expenditures, smaller acquisitions or stock buybacks.   A Dow spokesperson said: "The company has notified employees in Germany that they are looking for opportunities to sell some of the infrastructure assets and services of the Stade, Schkeberg and Bergeren plants, but it has not yet made a final decision."

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.  

Silicone rubber refers to a rubber in which the main chain consists of alternating silicon and oxygen atoms, and two organic groups are usually attached to the silicon atoms. Ordinary silicone rubber is mainly composed of silicone chain links containing methyl groups and a small amount of vinyl groups.   Thermal aging is the most important form of aging of silicone rubber. The use environment of silicone rubber is in high temperature air, and the combination of heat and oxygen causes thermal aging. In the process of thermal oxygen aging, high temperature promotes the oxidation of silicone rubber, and oxygen promotes the thermal degradation of silicone rubber.   The structural changes of silicone rubber can be divided into two categories in the thermal and oxygen aging process: one is the degradation of molecular chains caused by the thermal and oxygen aging reaction; the other is the cross-linking between molecular chains. Molecular chain rupture causes rubber to become sticky after aging; cross-linked rubber will harden after aging, which will reduce the mechanical properties of rubber and eventually lead to failure. When the air heats up, the vulcanized silicone rubber is cross-linked, and the drop in elongation at break is much greater than the tensile strength.   According to the thermal aging mechanism of silicone rubber vulcanizates, there are several ways to improve their thermal aging properties, as follows:     Change the composition of the side chain of the silicone rubber, such as introducing phenyl groups, etc., to prevent the cross-linking or decomposition of the molecular chain of the silicone rubber due to the decomposition of the side chain. This is because the phenyl group is not easily oxidized, and steric hindrance is formed in the silicon chain, so the organic silicon chain is more difficult to decompose. And because of its greater conjugation effect and steric hindrance effect, the thermal decomposition temperature is higher. By introducing large-volume segments into the molecular chain of silicone rubber, the thermal stability of the cross-linked bonds of the vulcanizates, such as carbon, decyloxy, benzene, phenyl ether and cyclic diimino groups, is improved. Heat-resistant additives are added to the rubber compound to prevent side chain oxidative cross-linking and main chain cyclization decomposition, such as iron oxide, dioxane, and hexaphenyl cyclotrisilane.   Add metal oxide antioxidant The oxidative aging mechanism of silicone rubber is mainly the side chain oxidation reaction caused by free radicals. If this chain reaction is prevented, the oxidation process will stop. Fe2O3 is the most commonly used antioxidant, and the addition amount is usually 3 to 5 parts. Related research reports that the composite metal oxide prepared by the liquid phase co-precipitation method can significantly improve the heat resistance of silicone rubber. Studies have shown that iron-tin composite metal oxide is more effective in improving the heat resistance of silicone rubber than a single iron oxide and tin oxide. This is because the crystal structure of the prepared composite metal oxide has changed, and their respective antioxidant effects have a synergistic effect. It can inhibit oxidation and improve the heat resistance of silicone rubber.   Add silazane Silazane can significantly improve the heat resistance of silicone rubber. The mechanism is: Silazane can effectively inhibit the degradation of the main chain, eliminate trace moisture in the silicone rubber, and make the heat resistance of silicone rubber up to 350°C. The higher the apparent activation energy and hydrolytic stability of silazane, the better the thermal stability of silicone rubber. The commonly used ones are: hexamethyldisilazane, hexamethylcyclotrisilazane, etc.   Add silicone Silicone resin is a highly cross-linked polysiloxane with a network structure and is a thermosetting resin. Its main chain is composed of silicon-oxygen bonds and has the same structure as quartz and glass, and has excellent thermal oxidation stability. Heating at 205°C for 42 hours, the weight loss of silicone resin is only 2% to 8%, and after heating at 350°C for 24 hours, the weight loss is less than 20%.

As we have known, silicone seal ring is widely used in daily life, mainly used for the waterproof sealing and preservation of crisper, rice cooker, water dispenser, lunch box, heat preservation box, heat preservation box, water cup, oven, magnetized cup, coffee pot and other products. As the application of TPE continues to expand, some people wonder whether TPE sealing ring can replace the silicone sealing ring? Let's first take a look at the advantages of silicone seals: 1. Tensile strength up to 1500PSI and tear resistance up to 88LBS. 2. Good elasticity and good compression ratio. 3. Good resistance to neutral solvents. 4. Silica gel has good heat resistance. 5. Excellent cold resistance. 6. Excellent resistance to ozone and oxide erosion. 7. Excellent electrical insulation performance. 8. Good heat insulation and heat dissipation, non-toxic and tasteless.   Disadvantages of silicone seal ring It is not recommended for use in most thickened solvents, oils, concentrated acids and diluted sodium hydroxide.     TPE seal ring features TPE sealing ring material products are divided into two kinds of oil resistant and non-oil resistant, oil resistant grade can be resistant to toluene, gasoline, oil, alcohol, etc., the product elasticity is good compression resistance, excellent deformation resistance performance, and PP adhesion. 1. Performance advantages: excellent elasticity, oil resistance, weather resistance, aging resistance, flexure resistance, ozone resistance and chemical resistance. 2, processing advantages: available plastic processing methods: injection, extrusion, blow molding, processing simple, can be hot welding, small tolerance, high precision, rich color. 3. Industrial progress: Compared with rubber processing, mixing, refining and vulcanization processes are eliminated, and energy consumption, labor consumption and environmental damage are reduced. 4. At the same time, the waste can be recycled 100%, greatly reducing the processing cost of products, has become the replacement of traditional rubber, is the latest environmental protection materials.   TPE has so many advantages, so can you replace the silicone rubber sealing ring?It is necessary to refer to the industry and use environment. If it is common building, door seal or refrigerator, TPE material can be generally used.The cars still use more EPDM and TPV silicone rubber.If there is a requirement for high temperature resistance, it is more choice of silicone rubber.Silicone rubber is more commonly used, especially in food and medical applications.   If you need to choose materials for your design, our engineers can give you some constructive Suggestions and provide you with a package solution.Please contact us in time.   E-mail: jdlxs-09@judelixm.com.cn Contact: Mr. Derek.Cheng WhatsApp: +86 13906053580  

Shin-Etsu Chemical Co., Ltd. (Headquarters: Tokyo, President: Yasuhiko Saito) has developed innovative silicone thermal interface materials that can be used in electric vehicles (EV) and hybrid electric vehicles (HEV).     With the electrification of automobiles, the demand for heat dissipation measures for lithium-ion batteries and various other electronic control systems has become increasingly complex and diverse. With the accelerated development of electric vehicles worldwide, the number of thermal interface materials in automotive parts continues to increase, and their applications are also expanding. In response to the ever-changing market environment, Shin-Etsu Chemical has developed two new products with unique characteristics:   1. TC-PEN series: It has a significantly reduced density and a soft thermal interface pad, which can meet the high-level requirements of EV and HEV applications.   2. TC-SET series: It has a high thermal interface cushion and extremely low compression set characteristics.   Due to the unique technology, the density level is very low. Compared with traditional products, the weight of the "TC-PEN series" is reduced by about 15% while maintaining the same level of thermal conductivity and processability. The new product is lighter in weight and has excellent processing flexibility, making it suitable for use as a heat sink in electronic devices with uneven surfaces and large-area parts such as lithium-ion batteries.   "TC-SET series" maintains flexibility by maintaining low hardness and low compression set characteristics, which has been difficult to achieve in this technical field so far. Therefore, this new product is suitable for various electronic devices used in harsh automotive applications to realize heat dissipation. These electronic devices need to have long-term durability against vibration and low compression set characteristics.   In addition to innovative silicone cushions, Shin-Etsu also offers a wide range of other silicone thermal interface materials. Provide various types of thermal conductivity products, such as silicone rubber sheet, grease (oil compound), filler and liquid rubber (adhesive and potting agent). As a silicone manufacturer that can provide customers with various silicone thermal interface materials, Shin-Etsu Chemical can actively respond to the needs of various thermal countermeasures.   With the development of these new products, Shin-Etsu Chemical is continuing to meet customers' more complex requirements in areas such as technical support for thermal analysis technology, and Shin-Etsu Chemical is starting manufacturing and processing in IATF16949:2016* standard factories.   IATF 16949: 2016* is an international standard for automotive quality management systems.

The main application areas of rubber diaphragm products include household appliances, water pumps, air pumps, solenoid valves, regulating valves, metering valves, instrumentation and other fields.     Silicone diaphragm valves, umbrella valves, one-way check valves Its advantages are high working reliability, good compositeness, long working life, low cost, and can accurately perform operations synchronously with other control components. Even under extremely harsh working conditions, it can guarantee its normal work and long-term use life.     Our common coffee machines and small water pumps in soymilk machines are also useful for rubber diaphragm products. Such products need to pass strict FDA certification, life testing, etc. According to the specific use environment, some products require cloth clips, which can be effective Increase the tear resistance and service life of the product.  

Liquid silicone, divided into glue A and glue B, using A quantitative device to control the ratio of 1:1, and then through the static mixer to be fully mixed, injected into the injection tube and then the injection molding production.The liquid silicone is injected into the hot runner mold to produce silicone products, which can achieve the advantages of one-time molding, no waste and automation.     Characteristics of liquid silicone: Liquid silicone is a non-toxic, heat-resistant, and high-resilience flexible thermosetting material. Its rheological behavior is mainly manifested by low viscosity, fast curing, shear thinning, and high thermal expansion coefficient. It is a two-liquid rapid vulcanization material with platinum as a catalyst. It can be produced by injection molding, mass, rapid vulcanization, and repetitive mechanical production. Its products are characterized by good thermal stability, cold resistance, excellent electrical insulation properties, and no toxic substances are produced during combustion.   Therefore, it has become an irreplaceable material in the production design of health products, automobiles, baby products, medical products, diving products, kitchen appliances, and seals.   Liquid silicone molding process: LSR is a two-component liquid material, divided into A component and B component. The work of the mixer fully mixes the A component and the B component in a precise ratio of 1:1. Also, because some products are of colored design, it is equipped with a color pump set and a color measurement part. A+B components, additives, colors, etc. enter the plasticizing system after fully mixed.     The plasticizing screw has the functions of homogenization and mixing at the same time. The mixture is injected into the hot mold through the screw, and the silica gel undergoes a curing reaction at a mold temperature of 170-200°C. When using a cold runner system, it is worth noting that the runner should be cold enough. In order to avoid glue leakage, the needle valve is installed on the surface of the mold part. When the glue is injected, the needle valve immediately closes the nozzle.