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

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.

Screen printing process has high requirements for the pattern, so it will appear in some silicone buttons and silicone protective sleeves and other processes. The ink of the product is more important for the screen printing process, and the quality of the ink will improve the quality of the pattern. While some products have faded after long-term use, there are mainly several reasons leading to the fading phenomenon of the product: 1. The baking temperature of silica gel products after screen printing is too low and the time is short, which leads to poor wear resistance of silica gel products characters printed out by 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 silica gel products is too dirty, which prevents the adsorption of silkscreen ink and silica gel, causing the character to be wiped away.

In addition to some thermoplastic silicone which does not require vulcanization, both natural rubber and synthetic silicone rubber need to use vulcanizing agents to vulcanize. After vulcanization, silicone rubber has a high application value, and its mechanical properties are greatly improved. In order to avoid direct contact with metal Kun friction attack of static fire, advocate plastic wrap, and then participate in the Kun cylinder mixing. This product is very sensitive to the static electricity of open fire, the rubber mixer should be grounded. Pour cold or hot water off the oil. There are some silicone products manufacturers, mainly using food grade silicone. When the vacuum degree is guaranteed and the vacuum time is coming, pay close attention to the high temperature. If the material temperature still does not meet the process requirements after the vacuum time arrives, it should continue to vacuum and continue to heat until the material temperature meets the requirements. The regeneration of silica gel after adsorption of organic impurities, roasting method for coarse pore silica gel, can be gradually heated in a baking furnace, about 1 hour later the rubber granules will be white or yellow brown. In addition to this role, methyl diphenyl Rtemperature vulcanized silicone rubber in addition to this role, but also has a wider use temperature range than methyl indoor Rtemperature vulcanized silicone rubber.  

Silica gel products in the forming, if the vulcanization temperature is increased, the vulcanization time can be shortened, the vulcanization efficiency will be effectively improved, so many Dongguan silica gel products factory vulcanization molding practitioners in the early stage in order to speed up the molding speed of silica gel, rubber products, will start on the increase in temperature. Sometimes it is really effective to shorten the curing time, but sometimes it will be self-defeating, not only did not improve the capacity, but also a lot of numbness and rupture, what is this? In fact, silicone, rubber vulcanization temperature cannot indefinitely increasing, because of the silicone and rubber is a polymer, high temperature can cause the rubber chain output cracking reaction, crosslinking rupture, resulting in "sulfide to return the original" phenomenon, resulting in a decline in the physical and mechanical properties of the silicone, rubber products, namely we often say change and burst. ES According to the experience accumulated in the production process of some silica gel products, the common silicone and rubber vulcanization temperature recommendations are as follows: Natural rubber (NR) vulcanization temperature recommended: the most reasonable range :140~150℃, not more than 160°C; Recommended curing temperature of butadiene rubber (BR), isoprene rubber (IR) and neoprene rubber (CR) : the most reasonable range :150~160℃, not more than 170C; Styrene butadiene rubber (SBR), nitrile butadiene rubber (NBR) curing temperature suggested: curing temperature can be used more than 150℃, but not more than 190℃; Recommended curing temperature of butyl rubber (IR), EPDM: the most reasonable range of 160~180℃, not more than 20O°C; Hot vulcanized silica gel [SR], fluorine rubber (FR) vulcanization temperature recommendation: the most reasonable range of 170~180℃, if the need for secondary vulcanization, the secondary vulcanization temperature control in 200~230℃, time according to the process requirements within 4~24H. Vulcanization of rubber products three elements: temperature, time, pressure. When the pressure is certain, the high temperature curing time is short, on the contrary, the low temperature curing time is longer. Rubber polymer, in the state of high temperature will make the molecular chain damage, leading to cross-linking bond fracture, that is, the phenomenon of "vulcanization back to the original". After the vulcanization temperature is determined, the pressure and time will be determined because the equipment and abrasive tools are existing in the enterprise. Vulcanization temperature selection generally considered raw gum varieties and vulcanization system selection to consider: The vulcanization temperature range of ordinary sulfur vulcanization system is 130~158°C; Effective and semi-effective curing system curing temperature range 160~165℃; The temperature of the resin or peroxide vulcanization system is between 170 ° C and 180° C. Thick products or line products choose low temperature long time vulcanization, thin products high temperature rapid vulcanization. Hard products choose low temperature vulcanization, slow down the speed of reaction heat generation, contribute to heat dissipation, so that the product internal temperature is reduced to meet the vulcanization is not easy to burst.

First, we should understand the characteristics of the silicone button The hardness of the silicone button is generally about 45°. The single key surface of the printing has convex, concave solitary surface and plane, all of which are field line printing. In addition to requiring accurate position and clear graphics, printing ink is also required to be suitable for printing silica gel, the ink layer reaches a certain thickness, has strong adhesion and wear resistance, and does not change color or fall off after high temperature baking. Therefore, it puts forward special technical requirements for the screen printing process. Two, the production method of screen printing screen There are many methods of screen printing plate making, mainly using the photographic plate making method, that is, the sensitive adhesive is directly coated on the net, after drying to form a certain thickness of the sensitive film to become the graphic carrier, the process is: Select net, select frame, stretch net, clean screen, dry, coating photosensitive adhesive, exposure, development, printing The specific process is as follows: 1. Net frame Generally use aluminum alloy, easy to operate, strength is not easy to deformation. Before the mesh with cyclohexanone wipe the mesh frame, remove the residual grease and dirt, and then wipe with industrial alcohol, after cleaning with water, and then dry the mesh frame. In the operation of the screen printing plate, it is necessary to dry several times, so the drying condition and cleaning should be strictly controlled. 2. Stretch mesh The first selection of silk screen, rubber screen printing using nylon wire mesh, ink through the screen rate is good, constant tension, choose to cover the edge of the mesh frame and more than 6 ~ 10Cm mesh outside the mesh frame, using pneumatic mesh machine mesh, and tension meter for six point test, reach the required tension, coated with universal adhesive so that the screen stick to the mesh frame, with hot air blowing to speed up drying, After about 5mInR of bonding, you can turn off the mesh machine, the excess screen glued on the outside of the mesh frame, in order to maintain the bonding fastness of the screen. Cut off the excess screen, with cyclohexanone, industrial alcohol after cleaning the net surface dry. If the tension of the stretched net is unstable, it may cause the font offset and fuzzy, and there is a chord surface substrate resulting in the difference in the thickness of the ink layer. Flat orthographic printing requires a large tension screen, a camber printing surface requires a small tension screen, the process of the application of the screen tension range is 3N/Cm ~ 7N/Cm. Generally, the screen with large tension has a short service life. The process should be selected according to the needs: 100 straight yarn screen for printing conductive ink, 200 ~ 300 diagonal screen for printing positive characters and color blocks, in order to ensure the thickness of the ink layer and the integrity of the picture and text.

First, we should understand the characteristics of the silicone button The hardness of the silicone button is generally about 45°. The single key surface of the printing has convex, concave solitary surface and plane, all of which are field line printing. In addition to requiring accurate position and clear graphics, printing ink is also required to be suitable for printing silica gel, the ink layer reaches a certain thickness, has strong adhesion and wear resistance, and does not change color or fall off after high temperature baking. Therefore, it puts forward special technical requirements for the screen printing process. Two, the production method of screen printing screen There are many methods of screen printing plate making, mainly using the photographic plate making method, that is, the sensitive adhesive is directly coated on the net, after drying to form a certain thickness of the sensitive film to become the graphic carrier, the process is: Select net, select frame, stretch net, clean screen, dry, coating photosensitive adhesive, exposure, development, printing The specific process is as follows: 1. Net frame Generally use aluminum alloy, easy to operate, strength is not easy to deformation. Before the mesh with cyclohexanone wipe the mesh frame, remove the residual grease and dirt, and then wipe with industrial alcohol, after cleaning with water, and then dry the mesh frame. In the operation of the screen printing plate, it is necessary to dry several times, so the drying condition and cleaning should be strictly controlled. 2. Stretch mesh The first selection of silk screen, rubber screen printing using nylon wire mesh, ink through the screen rate is good, constant tension, choose to cover the edge of the mesh frame and more than 6 ~ 10Cm mesh outside the mesh frame, using pneumatic mesh machine mesh, and tension meter for six point test, reach the required tension, coated with universal adhesive so that the screen stick to the mesh frame, with hot air blowing to speed up drying, After about 5mInR of bonding, you can turn off the mesh machine, the excess screen glued on the outside of the mesh frame, in order to maintain the bonding fastness of the screen. Cut off the excess screen, with cyclohexanone, industrial alcohol after cleaning the net surface dry. If the tension of the stretched net is unstable, it may cause the font offset and fuzzy, and there is a chord surface substrate resulting in the difference in the thickness of the ink layer. Flat orthographic printing requires a large tension screen, a camber printing surface requires a small tension screen, the process of the application of the screen tension range is 3N/Cm ~ 7N/Cm. Generally, the screen with large tension has a short service life. The process should be selected according to the needs: 100 straight yarn screen for printing conductive ink, 200 ~ 300 diagonal screen for printing positive characters and color blocks, in order to ensure the thickness of the ink layer and the integrity of the picture and text.