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

Why is carbon black vulcanized after adding silicone rubber not ripe? According to the manufacturer's technical analysis, it is likely that the purity of carbon black is not high enough and the sulfur content is high, so it is recommended to use acetylene carbon black as silicone rubber packing.   As we all know, acetylene black is a kind of conductive carbon black, with high purity, good thermal conductivity, ash content, low sulfur content, surface water absorption characteristics.   Its low sulfur content is an important reason for its suitability for conductive silicone rubber products, which is related to the vulcanization process of silicone rubber. High purity acetylene black is due to its low sulfur content, which has overcome the problems of poor vulcanization and premature vulcanization in the vulcanization process of silicone rubber.   When we choose carbon black, we can tell the carbon black manufacturers what products we need to make and the physical requirements of carbon black, so that the carbon black manufacturers can give us better Suggestions, so that the quality of our products can be better guaranteed.  

Does food grade silicone smell? No, food grade silica gel is airless and tasteless, even if it is heated and baked at 250 degrees, it is also odorless. It can still maintain its own superior performance after long-term use at 200 degrees. Generally, the food-grade silica gel supplied by regular manufacturers has FDA food certification, and customers can request this certificate from the manufacturer. Food-grade silicone is a liquid silicone material mainly used for the production of food product silicone molds, such as cake molds, ice sculpture molds, ice cream molds, chocolate molds, candy molds, etc. After the silicone mold is made, the food ingredients are directly injected into the mold to form food, so this also means that the requirements for food-grade silicone are very strict, and all indicators must be implemented in accordance with FDA requirements, including odorless. Very important item. In the mold making operation process, it can have two molding methods to choose from, one is heating and curing molding, the other is curing molding at room temperature, and there are two operating methods, one is potting and the other is brushing. I will not elaborate on the method of the model, how to operate it, and what should be paid attention to. Customers in need can contact us. So, at this point, we can know that food-grade silica gel is a very environmentally friendly silica gel material, which is airless, odorless, temperature-resistant and durable. From the perspective of environmental protection of silica gel, the application of silica gel in the future market will become more and more extensive.  

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.

According to related reports, BASF recently announced that it will build a commercial production facility for black powder in Schwarzheide, Germany, whose raw materials will be derived from battery recycling and production waste. This investment further strengthens BASF's Schwarzheide site as a center for the production and recycling of cathode active materials (CAM).   With many electric vehicle manufacturers and battery producers in Central Europe, Schwarzheide is an ideal location for building a battery recycling-related industry. The investment will provide around 30 new production jobs and is scheduled to start in early 2024.   The first step in the battery recycling process is mechanical processing (of used batteries) to obtain a substance called "black powder". These black powders contain a large amount of important metals used in the production of cathode active materials: lithium, nickel, cobalt and manganese, and they will be used in BASF's planned new commercial hydro-smelting plant around 2025 to realize the recycling of used batteries.

What is the cause of insufficient resilience of silicone rubber products? We all know that silicone rubber products are widely used in various fields mainly due to its good toughness and softness. Silicone rubber products are soft, tear-resistant, and do not deform, and are widely used in life. However, once silicone rubber products lose these unique excellent properties, they become meaningless. Some common silicone sealing products will also experience product deformation and insufficient toughness after long-term use, thus losing their original performance. The lack of toughness of the product is mainly due to the various additives added in the raw materials, which will cause the product to have different properties. Among them, "white carbon black" is the main reason for the lack of toughness of the product, and white gray black is the main composition of the raw material of silicone rubber. One, the silica used in the production of materials with different hardness is also different, and the appropriate proportion of addition can also make the surface activity in the raw material. In addition to raw material additives, the molding vulcanization of the product also has a certain impact, and the elasticity of the product is directly related to the hardness of the raw material. When molding vulcanization, adding too much vulcanizing agent will cause the fluidity to be too active, and the product produced is either too soft or too high in tension, and adding too little vulcanizing agent will cause the product to be vulcanized and unable to form. Secondly, the control of temperature and time during the molding process is also very important. Too short vulcanization time will cause the product to be too soft and long-term use will gradually lose its resilience. Too high molding temperature will cause the product to be too brittle, and the resilience will be too weak and easy to break.  

What we usually say is medical silicone, which belongs to the silicone that can be used in medicine, but it is limited to the external use, and cannot be used inside the human body.This type of silicone may only have a food-grade standard.However, it can be used in the medical industry. It can be used in contact with the skin, such as medical silicone tube, respirator silicone mask, etc., but it cannot reach the medical level and biocompatibility test.In other words, this type of silicone is fine as long as it's not used in the body. Medical grade silicone, indicating medical grade certification and biocompatibility testing.Medically, it can be used inside the human body, including in contact with human blood.The safety level is higher than ordinary food level and medical level. In general, medical-grade silicone can also be called medical silicone. Conversely, medical silicone cannot be called medical-grade silicone because medical-grade silicone has a higher safety level.If you require a very high level of safety, be sure to check for biocompatibility reports or other medical-grade reports.

When we contact the silicone seal ring, we will find that there are many colors of the seal ring, the most commonly used is white and black, so which color of the seal ring performance is better?I'm sure many people will be curious about this question.   The engineer told us that the color of the silicone seal ring has nothing to do with the performance of the silicone seal ring.The color of the silicone seal ring is just the color paste added in the process of processing and production, making the raw material of silica gel stained with color. To put it simply, no matter what color of silicone sealing ring, its performance and characteristics are the same, there is no other difference.Therefore, the white silicone seal ring and the black silicone seal ring is actually completely the same, there is no one is good which is bad.   The only thing that distinguishes the performance of the silicone seal ring is that different materials are used or some special materials are added to improve the performance and characteristics of the silicone seal ring for different use environments. Now you should know that the performance of the color seal ring and the white seal ring is the same.

With the progress of science and technology and the development of society, people have been inseparable from plastic products and rubber products in their daily life. Today, I will introduce some simple methods to help you distinguish them.       With the progress of science and technology and the development of society, people have been inseparable from plastic products and rubber products in their daily life. Today, I will introduce some simple methods to help you distinguish them.     First, we start with the difference between plastic and rubber. Simply put, if plastic is deformed under the action of external force, it is difficult to restore to its original state, while rubber is easily restored to its original state. For example, if the rubber O-ring is stretched, it will return to its original shape immediately after loosening it. However, if the plastic product is deformed, it will not return to its original condition. In technical terms, under the action of external force, plastic deformation is plastic deformation, while rubber deformation is elastic deformation. Mainly depends on their molecular structure. The elasticity of plastics is generally less than 100%, while rubber can exceed 1,000% at most.   Secondly, the production process is different. Rubber products have an additional vulcanization process. The silica gel sealing ring has an open porous structure and can absorb many substances. It is a good desiccant, adsorbent and catalyst carrier. The adsorption of silica gel is mainly physical adsorption, which can be regenerated and used repeatedly. Add acid to the alkali metal silicate (such as sodium silicate) solution to make it acidify, and then add a certain amount of electrolyte to stir to form a silicic acid gel; or add acid or Ammonium salts can also generate silica gel.   Finally, plastic products may be repeatedly recycled and reused, while rubber products are not. It can only be processed into reclaimed rubber before being used again. O-rings are usually selected as large cross-section O-rings as possible. In the case of the same gap, the volume of O-rings squeezed into the gap should be less than the maximum allowable value. Silica gel has an open porous structure and can adsorb many substances. It is a good desiccant, adsorbent and catalyst carrier. The adsorption of silica gel is mainly physical adsorption, which can be regenerated and used repeatedly. Add acid to the alkali metal silicate (such as sodium silicate) solution to make it acidify, and then add a certain amount of electrolyte to stir to form a silicic acid gel; or add acid or Ammonium salts can also generate silica gel.

Conductive silicone rubber usually means that the volume resistance is within 10 to the 9th power of ohm cm. Conductive rubber is divided into anti-static conductive rubber.   1.The surface resistance of antistatic silicone rubber products reaches 10 to the power of 5-12, which is an antistatic level. Within the 9th power of 10, the 6-8th power of 10 is permanent, but the performance of the raw material will deteriorate, and the 9th power of 10 is short-term antistatic. 2.The surface resistance of conductive silicone rubber products is less than 10 to the 5th power, which is the conductive level. The volume resistivity is generally 3-10Ω·cm, the relative density is 1.15, the hardness (Shore A) is 60, the tensile strength is 5.7MPa, and the relative elongation is 265%. It can be mixed and mixed with methyl vinyl silicone rubber (raw rubber), white carbon black, conductive filler, structure control agent and organic peroxide. When the volume resistance is less than 10 ohm cm, the conductive rubber has electromagnetic shielding function.   Many silicone products are used in electronic and electrical components, which must be antistatic. Antistatic agents can be added when producing silicone products.  

Silicone rubber buttons are widely used in color TV sets, air conditioners, calculators and electronic game consoles. Screen printing quality directly affects the quality of the product appearance. 1. Key mold production Qualified mold not only to achieve the technical indicators of the keys, but also to meet the requirements of screen printing. Ensure that the key surface surface finish is high, only the smooth surface can print the character edge clear and three-dimensional words. Conversely, the rough surface printed characters must be uneven surface, the edge of the burr. The best screen printing effect is based on good mold. 2. Silicone rubber formula The raw material formula of the silicon rubber key sheet that needs screen printing must strictly control the content of release agent, not only consider the release convenience but ignore the screen printing binding force. Release agent content is too high, printing after drying, gently wipe off. Demoulding agent is too high, transparent or white key pieces by printing drying will cause yellow phenomenon, seriously affect the appearance of the product quality. 3. Drying temperature Post-press drying temperature is too high, often make light color and white key pieces yellow phenomenon, too low temperature will cause poor binding force. Therefore, strict control of temperature is one of the keys to ensure the binding force of printing. Drying products must be cooled before they can be loaded into the turnover box, otherwise light or white products will be yellow and affect the appearance.