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

Silicone rubber refers to the main chain is composed of silicon and oxygen atoms alternately, silicon atoms are usually connected with two organic groups of rubber. Its molecular chain is composed of silicon atoms and oxygen atoms alternately (-SL-O-SL -), silicon oxygen bond energy is much larger than the general rubber carbon-carbon bond bond energy, which is one of the main reasons for the high thermal stability of silicone rubber. Ordinary silicone rubber consists mainly of a silico-oxygen chain with methyl and a small amount of vinyl. The introduction of phenyl can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyanide can improve the temperature and oil resistance of silicone rubber. Silicone rubber has good low temperature resistance and can still work at -55℃. After the introduction of phenyl, -73℃ can be reached. Silicone rubber has good air permeability and oxygen permeability is the highest in synthetic polymers. In addition, silicone rubber also has the outstanding characteristics of physiological inertia, will not cause clotting, so it is widely used in the medical field. (1) High and low temperature heat resistance The temperature resistance of silicone rubber is very good, and the temperature range of silicone products is the widest (-100~350C). For example, properly matched vinyl silicone rubber or low phenyl silicone rubber can remain elastic after hot air aging at 250C for thousands of hours or 30OC for hundreds of hours; Low phenyl silicone rubber vulcanized rubber can remain elastic after tens of hours of hot air aging at 350C; Its glass transition temperature is -140℃C, and its vulcanized rubber is still elastic at the temperature of -70~100C. Silicone rubber can withstand instantaneous high temperature of thousands of degrees when it is used as thermal protection coating on the inner wall of rocket nozzle. Continuous service life of silicone rubber at high temperature. (2) Ozone aging resistance, oxygen aging resistance, light aging resistance and weather aging resistance The properties of silicone rubber vulcanizate have no significant change after being exposed to sunlight for several years in free state. Comparison of ozone aging resistance of silicone rubber and other rubber. (3) electrical insulation performance The electrical insulation performance of silicone rubber vulcanized rubber changes little when exposed to moisture, frequency changes or temperature increases. The silica generated after combustion is still an insulator. In addition, the molecular structure of silicone rubber has fewer carbon atoms; And do not use carbon black as filler, so in the arc discharge is not easy to char, in high pressure occasions is very reliable. Its corona resistance and arc resistance is excellent, corona resistance life is 1000 times of PTFE, arc resistance life is 20 times of fluorine rubber. (4) Special surface properties and physiological inertia The surface of silicone rubber is smaller than most organic materials, with low moisture absorption, long-term immersion in water water absorption rate is only about 1%, physical properties do not decline, good mildew resistance, and many materials do not bond, can play an isolation role. Silicone rubber tasteless, non-toxic, no adverse effects on the human body, and the body tissue reaction is slight, has excellent physiological inertia and physiological aging. (5) High permeability Compared with other polymer materials, silicone rubber has good permeability, and the permeability of nitrogen, oxygen and air at room temperature is 30~40 times higher than that of NR. It is selective to gas permeation, for example, the permeability of carbon dioxide is about 5 times that of oxygen. (6) Biomedical performance The properties of the molecular structure of silicone rubber make it have excellent biomedical properties. Silicone rubber is also widely used in the medical field. The most common is the successful application of silicone rubber medical tubes in a large number of animal and human tests.  

Electronic door valve and other sealing materials without silica gel. In all walks of life, silicone sealing products have become one of the essential sealing products in the industry. So now many products have a certain threshold for their waterproof level. If they don't deliver, they won't be accepted by the market. The awareness of waterproofing of machinery and automobile products is becoming more and more strong, and the further requirements of environmental protection are also put forward. So waterproof silicone ring is one of the most common seal silicone rubber products in modern product design. When it comes to waterproof, it is necessary to see the actual effect of silicone rubber ring. So what are the main reasons for the waterproof effect of silicone rubber ring? At first, many friends think that silicone rubber products are soft, slow and elastic, and the waterproof effect mainly comes from the extrusion fit degree of silicone products to achieve the sealing effect. It's not entirely wrong here, but in addition to that, the structure will also create a finished product that is airtight and waterproof. For example, if the product size is too big or too small, the sealing effect is not tight enough to achieve the sealing effect. The deeper the water pressure, the smaller the sealing effect. So it can be seen that silicone sealing products should be combined with the actual situation to see whether the product structure can be integrated into the body! According to the years of experience of silicone products processing manufacturers, if you want to make silicone rubber products sealed to achieve better waterproof effect, you may need to know these points! 1. Predict the size of the sealing ring according to the size of the parts to be sealed. 2. What is the maximum sealing effect, what is the minimum sealing degree, waterproof degree depends on the size of the product. 3. Choose different hardness and materials according to the actual size and what material is used to seal! 4. Whether the softness and size of silicone can fit into the sealing position, and how much size can be expanded to the maximum extent! 5. Different materials should be selected for sealing in different environments, such as long time water immersion and intermittent water immersion.

For the screen printing process, it has many excellent characteristics, good fluidity, strong paste viscosity, high and low temperature stability, good weather resistance to aging performance, the product pattern has more three-dimensional sense and feel, screen printing pattern also has excellent peeling strength, wear resistance, brightness; It is also waterproof, non-slip, breathable, high and low temperature resistance and outstanding leveling property. What details do we need to pay attention to in the silk-screen printing process in the production process of silicone products manufacturers? Screen printing process for the pattern requirements are relatively high, so in some silicone buttons and silicone protective sleeves and other processes will appear, the product ink is more important to the screen printing process, good quality ink will improve the quality of the pattern, and some products in long-term use for a long time, there are mainly several reasons leading to product fading phenomenon: 1. The baking temperature of silicone products after screen printing is too low and the time is short, resulting in poor wear resistance of silicone products characters printed out of screen printing, and the characters begin to become blurred after several times of use; 2, screen printing ink quality is too poor, affect the surface of silicone products; 3, the surface of silicone products is too dirty, hinder the adsorption of screen printing ink and silicone, resulting in a wipe off the character.

First of all, we summarize the classification of rubber products. Rubber products include rubber seals for automobiles, rubber buffer blocks for industrial life, rubber coated iron parts, rubber seals, gaskets, rubber seals, rubber toys, rubber miscellaneous parts and rubber shaped parts, etc., and rubber products are made of preferred materials for different parts, with different functions of rubber products; Some rubber products have the advantages of high strength, wear resistance, oil resistance, high temperature resistance, beautiful appearance, bright color, etc., such as rubber sealing strip, rubber plug, rubber kit, rubber sealing products, etc.   Rubber products can also be customized according to demand, mold research and development design, so in the prototyping trial production, the need to design to meet the requirements of quality testing and use; At the same time, it should also be noted that when rubber products manufacturers choose materials, they also need to choose environmental protection and good performance; On the one hand, in order to do a good job of their own brand, on the other hand for the customer needs the quality of rubber products and star body customization, seiko fine, can also make rubber products durable, provide better use experience.    

Fire seal material and process, first of all, the material, PVC fire seal, EPDM fire seal, graphite fire seal, modified PVC fire seal, silicone fire seal, and chloroprene rubber, polyurethane rubber, thermoplastic vulcanized rubber, butyl fine, rubber, plastic, plasticized PVC and so on; They all play the role of shock absorption, fire prevention, waterproof, sound insulation, dust, heat insulation, fixed sealing and so on. But their physical performance is more or less different, such as fire time, fire rating, industry specifications, and so on, some fire seals need to choose the expansion rate of 3-5 times the product. There are production requirements in addition to physical properties, hardness, tensile strength, compression recovery rate, tensile strength change rate and other production standards. As for the process of fire seal, if the EPD fire seal is used as a fire seal for construction, its process is generally mixed with ABS resin, supplemented by filler, improve the heat resistance of the material, at the same time, due to the addition of flame retardant additives such as zinc borate, it makes the thermal stability of the material and the residual carbon rate has been better improved.

Silicone O-ring is widely used in mechanical equipment, food sealing and other environments because of its low price, simple manufacturing and simple installation requirements. There are some inappropriate reasons in the sealing process, which will cause the silicone sealing ring deformation and poor elasticity. Silica gel sealing ring plays the role of anti-ash, waterproof and other sealing - physical in the electronics industry, is the most widely used in all kinds of household appliances. The integration of products with silicone sealing rings also needs the assistance of glue, so that soft rubber products can be more integrated with household appliances. With the development and growth of soft rubber products, silicone sealing waterproof ring from rubber to the present stage almost occupies all the industries of household appliances sealing, many waterproof, oil-proof household appliances almost use silicone sealing products made of silicone materials, such as automatic washing machines, rice cookers, electric water heaters and so on. And the use of silicone sealing ring can not be ignored. If the working pressure of the equipment is increasing, the silicone sealing ring will lose its sealing performance under long-term high pressure. High temperature will accelerate the aging of rubber materials. The higher the operating temperature, the greater the compression deformation of the silicone seal ring. When the deformation of the product exceeds 40%, the sealing ring loses its sealing performance and leakage occurs. The process formula used to make the silicone sealing ring produces compression stress relaxation in the compression state, and the compression stress will decrease with the increase of time. The longer the use time, the greater the compression ratio and tensile strength, the greater the stress drop generated by rubber stress relaxation, so that the silica gel sealing ring is not elastic enough, thus losing the sealing performance.

How to control the hardness of silicone rubber products? Friends who often contact silicone products will notice that some silicone products are very soft, some silicon products are very hard; This is often referred to as the hardness of silicon products.What is the hardness of all kinds of silicone products? What's the difference in hardness of silica gel? What is the hardness standard of silica gel? The tester can directly use Shaw HA hardness tester to measure the soft or elastic products. TPU, TPR plastic film bags and other products. And feel basically no elastic or hard can be tested with Shaw HD hardness tester, such as: PC, ABS, PP and other products. xxHA indicates a low hardness, if the content of Shaw xxHD indicates a high hardness. If the use of different fields choose different hardness of silica gel products, usually low hardness can reach about 10 degrees, or even 3-5 degrees below, usually used silica gel products usually hardness in the range of 30 degrees to 70 degrees. It is also the reference hardness of many products, but the hardness of special preparation material silica gel products can reach 80-95 degrees. The other is the ordinary silica gel processing technology, that is, the processing technology of solid silica gel products. Now the whole silica gel industry can carry out the processing technology of solid silica gel products. The lower softness is 10 degrees, the higher hardness is 90 degrees, can be higher, but the unqualified rate is too high, the product is too brittle, the cost is high, and it is difficult to demoulding. As a result, solid processes are best suited between 30 and 70 degrees of hardness. The change of silica gel resistance to tear, the higher the hardness of the product to tear resistance is weaker. In particular, products with right angles are prone to tear and fracture. The lower the hardness, the better the tear effect is, and the different tear effects are different according to the hardness. Of course, this also depends on the rubber content of the product, but different rubber content, silica gel scalability and related performance are also very different. The deformation and expansion force under the action of a certain expansion force is an important control index of silica gel material, which is just related to the hardness. The temperature and pressure in the process of hardness, vulcanization have a great influence on the tensile deformation of silica gel material. The change of wear resistance and fatigue. Products with different hardness have different effects on wear resistance and fatigue. The hardness of ordinary silica gel material increases with the increase of silica black content, and the phenomenon of fatigue reduction and insufficient wear resistance will also occur after long-term run-in. Because of the difference in elasticity, elasticity is one of the important properties of silica gel materials, different hardness of materials will affect all different application products, but the hardness change is too big, may lead to the overall use of silica gel products, affect all links of the product! Therefore, many customers in the purchase of silicone rubber products can not accurately describe the use of hardness, nor specific material requirements for hardness. However, the custom hardness of silicone rubber products directly affects the use effect of the whole product. Or do not understand the hardness of silica gel material friends can first understand the hardness of silica gel material and then decide the hardness.

Conductive silica gel products: Conductive adhesive is widely used in electronic assembly sensing, including fine wire and printing materials, electroplated bottom plate, metal layer of ceramic adhesive, metal chassis bonding, bonding wire and tube seat, bonding element and flat face through the printed line, bonding waveguide tuning and hole repair, etc. These functions are all due to its material deployment characteristics, including silver or copper, nickel, etc. Toner and other fillers reach the conductivity coefficient, among which the bonding strength additives and rheological accelerators are the main additive materials, so it also creates the advantages and defects of conductive silica gel. Ordinary silica gel and conductive silica gel production still have a certain difference in performance, in the processing of silica gel products, ordinary rubber efficiency is fast, low defect rate, the performance of the output is different, ordinary rubber tensile toughness is normal than conductive rubber is better, and conductive rubber in addition to the conductive performance is prominent, in toughness and material life will be affected by a certain extent, in corrosion resistance, high and low temperature resistance, Wear resistance and aging property of electrical insulation are decreased.

A high-quality product without continuous maintenance of the mold in the case of long-term production may lead to a lot of problems, so the maintenance of the mold naturally indispensable. When the mold of silicone products manufacturer is used for a long time, we need to do some maintenance. This can not only extend the life of the mold, but also help us not suffer from any obstacles in the process of use. It can also reduce the cost of repairing the mold and the loss caused by missed work. 1. In the usual use, we should pay attention to check whether the various moving parts of the mold can operate normally every day, and whether the exhaust holes and waterways are blocked by silica gel products. This is the most crucial step to protect the mold when it is flat. Because the silica gel waste is blocked for a long time without any gap and air, the oil can not be fed, which leads to the probability of mold rust! 2. In addition to daily protection, regular inspection of the mold can not be ignored. Check whether the mold screw is loose, whether the wear plate is damaged, whether the spring can be normally elastic and so on. 3. When the production of the mold is stopped for a period of time, we should do a good job of cleaning the mold. Keep the mold closed to prevent mold rust. And pack the mold and put it in the box. In fact, the maintenance method is very simple, as long as we pay more attention to it when we use it at ordinary times. However, these daily actions are generally carried out by silicone rubber products manufacturers once a month for mold maintenance. If the mold is not maintained for a long time, it will cause mold loss and poor product production in the second production.

Nowadays, O-type sealing ring and sealing gasket are widely used in industry and life. Sometimes we will struggle, which kind of sealing effect is better? Let's look at the similarities and differences. The similarities between O-ring and gasket: Both meet the implied condition: when the sealing contact pressure is greater than the pressure of the sealed medium, the sealing effect is maintained; When the sealing contact pressure is less than the pressure of the sealed medium, the gasket or O-ring is pushed open, and a large amount of leakage occurs in the medium. The difference between O-ring and gasket: The flat gasket seal consists of gaskets, flanges and bolts, forming a complex statically indeterminate system; The seal contact pressure is provided by the deformation of the bolt. The contact pressure distribution of the flat gasket is uniform when it is working. When the medium pressure fluctuates and is greater than the contact pressure, the leakage may occur. In contrast, for the condition of constant pressure, both of them can be matched; However, for variable working conditions, when the pressure rises, it is possible to exceed the contact pressure range of the gasket, and the medium top opening sealing gap leakage. O-ring finish blasting gasket. In application, gasket is only used for static sealing, O-ring can be used for static sealing, but also can be used for reciprocating linear motion of the dynamic seal. In the design, the traditional sealing design method of gasket is not strict enough, the new design specification of flange gasket is in the process of test research; O ring design as long as the design manual on the line, both simple and reliable, convenient and practical. In fact, whether it is O-ring or gasket, the most important thing is suitable, can be better play its sealing role.