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

Silicone rubber products are widely used for its excellent properties like high temperature resistance, electrical insulation and external flexibility, among which, the most obvious feature lies in its odorlessness. However, in recent years some silicone rubber products have been found to have odors. What causes the odor of these products? The main cause of the odor is bacteria generated from raw materials and never property purified. For example, styrene, a major component of silicone rubber, can easily generate bacteria when exposed to air or moisture-containing environment during storage and transportation. In addition, additives used in silicone rubber, such as stabilizers, softeners, accelerators and fillers, may also act as a source of odor if the amount or quality is not well controlled. Finally, improper production processes can also cause the silicone rubber to emit odors. Thus, it is necessary to maintain good hygiene during the production process, optimize the production process, and use high-quality raw materials to avoid the odor of silicone rubber products.

So what is the hardness of all kinds of silicone products? What is the difference in hardness of different silicone products? What is the hardness standard of silicone products? Hardness standard of silicone products: Generally, for the products with large elasticity or soft feel, testers can directly determine the use of Shore HA hardness tester, such as: stationery plastic water bottle, TPUTPR plastic film bag and other products. And feel basic little elasticity or hard can be used to test Shore HD hardness tester, such as: PCABSPP and other products. If the degree is Shore xxHA, the hardness is relatively low. If it is Shore xxHD, the hardness is relatively high.   What are the differences in hardness of various silicone products? According to the use of various fields to choose different hardness of silicone products, Mix low hardness can do about 10 degrees, special silicone products can reach about 280 degrees! The commonly used silicone products are between 30 degrees and 70 degrees. There is also ordinary silicone products, can not be done with liquid silicone technology, there will be problems such as: silicone products are not good self-disassembly, the material is different, which leads to a problem is that the raw edge of the product is not smooth, the appearance of burr. So liquid silicone is suitable for low degrees of silicone products. The other is the ordinary silica gel process, that is, the solid silica gel product process. At present, the whole silica gel industry internal solid silica gel product process can do the low softness is 30 degrees, the max height is 80 degrees, although higher degrees can also be done, but the defect rate is too high, the product is brittle, and it is not good to self-disassembly. So solid state technology is most suitable for soft and hard degrees between 30 degrees and 70 degrees. Can not do more soft products, but self-disassembly better, the product appearance is beautiful, no burr. The hardness of silica gel and ordinary rubber is the same, Shore hardness is used to distinguish, generally the higher the hardness is harder, the hardness of silica gel raw materials can reach 0 degrees -90 degrees. Silica gel raw materials are divided into solid silicone and liquid silicone, solid silicone (mixed silicone) hardness can reach 20 degrees -90 degrees, commonly used for 30 degrees -70 degrees. And if you want to demand lower hardness of silicone raw materials, it will need to use liquid silicone, liquid silicone hardness is 0 degrees -20 degrees, commonly used for 10-20 degrees. In general, we use the most contact with the most widely is solid silica gel (mixed silica gel), in processing molding is more commonly used in the hardness of 30 degrees -70 degrees, if there are special needs of solid silica gel hardness can reach 20 degrees, the hardest can reach 90 degrees, but the lower the hardness of the molding process is more difficult. And silicone hardness if reached 80 degrees -90 degrees, in the mixing process is more difficult, the use of machinery and equipment is not the same. And high hardness silicone raw materials in molding scrap rate is very high, the product is very brittle, not good self-disassembly. Therefore, if you want to produce silicone products, the most appropriate hardness should be between 30 degrees -70 degrees.   Different hardness of silicone products will bring what aspects of the impact: 1, the change of extrusion strength, low hardness products will gradually decrease in strength, high hardness will increase, 5-10 degrees of difference will have different extrusion changes. 2, the change of tear resistance, the higher the hardness of the product tear resistance will be weaker, especially with the right Angle of the product is easy to tear, the lower the hardness of tear, the better the hardness is different. 3. Constant elongation stress causes deformation. Constant elongation stress is an important control index of silicone material, which is precisely related to hardness. 4, the change of wear and fatigue, different hardness of products have different effects on wear and fatigue, generally silica gel material with the increase of crystallinity hardness increases, long-term run-in will affect the phenomenon of fatigue decline wear-resistant enough. 5, the difference of elasticity, elasticity is one of the important elements in the silicone material, so the material of different hardness has an impact on each different application of the product, and the hardness of the ± difference is too large may lead to the use of the whole product, and even affect each link of the whole!

Sublimation Printing – In this process, the dyes used are solid at room temperature but turn into gasses when transferred onto the item being printed on. The dyes are injected into the substrate, usually silicone, and then heated until they turn back into solid form, leaving a colorized design on the substrate. Screen Printing – This process requires the use of a screen stencil. The screen is made of mesh fabric, and a negative image of the desired product is printed onto the mesh fabric and cured. The mesh fabric is then stretched onto a frame and places into a screen printing machine. Ink is then manually pushed through the mesh openings, creating an imprint onto the substrate. Pad Printing – Also known as ‘tampon printing’, this method uses a silicon pad and stencil to transfer ink from the pad onto the substrate. The ink is transferred from the pad to the substrate by repeatedly pressing onto the desired area and then lifting off. This process can print onto curved surfaces as well. Laser Engraving – This is the process of using a high-powered laser beam to remove the silicone material from the substrate, leaving behind an imprint of the desired design. The laser heats up the silicone and melts it away, creating the intricate designs. Thermo-Printing – Thermo-printing is the process of transferring a colored ink onto the silicone substrate. A ribbon is heated up, melting the ink and covering the substrate with the desired design.

Silicone products and rubber products are two kinds of products in the same industry. They both possess advantages and just have a few small differences. The main difference between the two is that silicone is classified as a synthetic rubber and rubber is natural. Also, silicone retains its elasticity and flexibility for much longer, potentially for the lifetime of the product, and can withstand more extreme temperatures than rubber. Both materials are used for a variety of products from medical supplies to automotive parts, but silicone is most popular for use in industrial products where cleanliness, sanitation, and resistance to particular chemicals are important. Rubber has several advantages due to the fact that it is natural, with the first (and perhaps most important) being that it consists of certain organic compounds that can resist certain organic compounds and bacteria. Its low cost and light weight make it a popular product for applications like car parts and gaskets. Rubber also possesses good insulation and elasticity. Silicone products are more expensive and less durable than rubber, but their ability to withstand extreme temperatures within the range of –50 to + 200 Celsius degrees, their low toxicity, and lack of sensitive functional chemistry means they are ideal for products that require a safe and resilient material. Other advantages include greater flexibility, resistance to solvents, and inert nature, which makes them non-reactive with other chemicals. Both rubber and silicone products offer advantages that make them ideal for certain products or applications. The choice between the two will depend largely on the application and function of the product itself.

Silicone products in the molding process a little attention will appear some adverse phenomena. For example, silicone products have poor elasticity. And some of the more frequently used silicone parts have certain requirements for tensile toughness, and the product mainly needs his tensile toughness to maintain. Therefore, in some manufacturing industries, the silicone material used in the mechanical industry will be useless once there is insufficient pull strength, springback shock absorption failure, and other performance of the product will be useless. Therefore, the operation of personnel in the molding process, the modulation of the machine, the coordination of raw materials are the key to the toughness and poor product.

Check the mold to see if the mold wear is relatively large, the accuracy is not high enough, resulting in the production of silicone sleeve burr more, difficult to deal with the problem. Curing temperature is too high or curing time is too long. Once the temperature of silicone products is too high, it will lead to numbness or brittleness after forming, which has a great impact on the subsequent edging. Long curing time is also one of the main reasons for brittle products. Vulcanization temperature is too low or vulcanization time is too short, vulcanization temperature is too low, vulcanization time is too short will also have a certain impact on the edge, silicone rubber products have a strong flexibility when not completely vulcanized, so it is difficult to remove the rough edge and product separate. From the production to solve these fundamental problems, we believe that the problem of silicone rubber products with rough edges can be well solved.

Most silicone rubber products are inflammable. By adding flame retardant filler and flame retardant filler and blending with flame retardant material, the flame retardant property of synthetic silicone materials can be improved. In addition, the introduction of ignition monomer in polymerization reaction is also an effective method in flame retardant process, and improving the crosslinking density of silicone rubber products is also beneficial to flame retardant. Next, a brief introduction - the flame retardant technology. 1.hydrocarbon Vertical rubber includes NR,SBR, BR,lIR, EPR, EPDM, etc. Although NBR does not belong to the vertical class, its flame retardant technology is very similar to that of the vertical class, so it is classified as synthetic silicone rubber treatment. The oxygen index of C-silicone rubber is between 19 and 21, and the thermal decomposition temperature is between 200 and 500° C. The heat resistance and flame retardant properties of C-silicone rubber are generally poor, and the decomposition products of combustion are mostly flammable gases. The common methods of this silicone rubber fire prevention are as follows: By blending with polyvinyl chloride, gasified polyethylene, chlorosulfonated polyethylene, vinyl acetate and other polymers, the flame retardant property of vertical silicone rubber can be improved appropriately, so as to improve the flame retardant property. Attention should be paid to the mixing ratio and co-crosslinking of blends. Adding flame retardants to vertical silicone rubber is an important way to improve its flame retardancy, and the synergistic effect of flame retardants is further improved. The common flame retardants are mainly halogenated flame retardants, mainly perchlorocyclopentane, decabromodiphenyl ether and chlorinated paraffin. Among them, antimony is the main inorganic flame retardant, followed by zinc borate, alumina hydrate, ammonium gasification and so on. In use, it should be noted that free halide flame retardants cannot be contained, because in the process of processing, free halide will corrode equipment and molds, and have an adverse effect on the electrical and aging properties of silicone rubber. In addition, attention should be paid to the adverse effect of the amount of flame retardant on the mechanical properties of silicone rubber. Add flame retardant inorganic filler, such as calcium carbonate, clay, talc, white carbon black, aluminum hydroxide, etc., to minimize the ratio of flammable organic matter. Calcium carbonate and alumina nitride have endothermic effects during decomposition. This will make some physical and mechanical properties of the rubber material decline, the filling amount can not be too large. Through the experiment of increasing the crosslinking density of silicone rubber, it is proved that increasing the crosslinking density can increase the oxygen index. So as to improve the flame retardant property of silicone rubber. The reason lies in the increase of thermal decomposition temperature of rubber. This method has been used in the production of ethylene-propylene silicone rubber. 2.halogenated rubber Halogenated gels contain halogen elements, and their oxygen index is generally between 28 and 45, and the -Fpm oxygen index even exceeds 65. The higher the halogen content of common halogenated silicone rubber, the higher the oxygen index; This silicone rubber itself has a high flame retardant, can be out of the fire. So its flame retardant treatment is simpler than light rubber. In order to improve the flame retardancy of halogenated silicone rubber, flame retardants are often added. 3.composite chain glue The most representative silicone rubber is dimethyl silicone rubber, its oxygen index is about 25, the thermal decomposition temperature of 400~6001. The actual flame retardant way is to increase the thermal decomposition temperature, increase the residue in the process of thermal decomposition, and slow down the generation rate of combustible gas.  

Silicone accessories are widely used in machinery manufacturing, especially automotive silicone accessories, which have many kinds and wide uses. Many cars have window buttons, mirror buttons, lumbar support buttons, navigators, and buttons for playing music and adjusting air conditioning. These are silicone buttons. Silicone has a corresponding elasticity. You need to calculate the weight of the spring force. The elasticity of each car may vary, but the effect is the same. But in the car, it's kind of like you. In addition to the keys in the car, the car accessories and sealing rings and silicone sealing products, common is our car after a period of driving or a few kilometers of maintenance, maintenance personnel is not the car up to turn on the fuel tank to put out the old oil? And it won't cause an oil spill? This is because of the silicone waterproof seal inside. Of course, there are silicone seals/rings in other places, such as glass water tanks, pressurized water tanks, steering wheels, engines, etc. It's just that we rarely see it. Although they are located in different locations, they have the same function. They are used for oil -, water - and leakage-related seals. Auto sealing rubber strip, good elasticity, anti compression deformation, anti aging and so on. The main role of the silicone tube is to transport oil and water. Silicone shock cushion, the role of these auto accessories is generally reflected in: sound insulation, noise reduction, waterproof, dustproof, shock absorption, etc.

Doors and Windows sealing strips are mainly used in aluminum alloy doors and Windows, plastic steel doors and Windows, wood doors and Windows and other architectural decorative doors and Windows. Door and window seals on the market. It is generally made of PVC, modified PVC, EPDM, elastomer seal (including TPV, TPE, TPR, SEBS), silicone and other materials. Doors and Windows sealing strips can be used in a variety of plastic steel doors and Windows and broken bridge aluminum doors and Windows, as well as some wood doors and Windows, can play an important role in fire prevention, wind proof, waterproof, dustproof, energy saving, sound insulation, anti-freezing, sealing, warm. 1.Rubber material Doors and Windows sealing strip rubber material windproof effect is relatively good processing is relatively simple, its color is rich consumers can freely choose to use the probability of high although the rubber material has some taste, but its elasticity and durability and windproof is very good. 2.Silicone material Silicone material doors and Windows sealing strip is better, it belongs to a kind of new sealing material, not only the heat resistance is particularly good, but also its elasticity is very good, plasticity is also very good for a wide range of application. 3.PVC material PVC material stability and wind performance is very good, the use of a long time will not appear yellow phenomenon, become the representative of the classic material.  

Before silicone kitchenware mildew phenomenon, we should first find the problem of mold to prevent it. In addition to the influence of climate, the main cause of mold also includes some additives in silicone raw materials, such as silicone oil, color powder, curing agent, etc., which are the main nutritional components of these molds. Mold growth causes the plant protein carbohydrates in the silicone rubber to be eroded. In addition, due to the electrostatic action of silicone rubber's inert rubber, impurities in the air are adsorbed on the surface of the product, which can also lead to mold growth. General silicone products manufacturers should consider these factors, so the mildew phenomenon in silicone kitchenware, in addition to raw material factors, mainly depends on their own control, silicone kitchenware can be kept in a ventilated place to keep clean after cleaning, silicone products after cleaning, according to the difference in temperature and humidity, choose to dry 1-2 hours, in order to facilitate the gap dry, will not cause mildew. After mold, you can wipe with alcohol. If it is difficult to solve several methods, can be treated with mildew. Anti-mold agent should have high thermal stability. Good weather resistance low volatility and good material compatibility characteristics. Also, you should choose a safer variety for the human body.