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The function and application of silicone seal ring The role of silicone secondary vulcanization

Release time:

2019-05-14 12:30

Source:

The function and application of silicone sealing ring The role of silicone secondary vulcanization?
 
Silicone sealing ringMainly used for waterproof sealing and preservation of daily necessities such as fresh-keeping boxes, rice cookers, water dispensers, lunch boxes, heat preservation boxes, heat preservation boxes, water cups, ovens, magnetized cups, coffee pots, etc. Without the silicone seal ring, the closed function of these items is lost. Next, Dongguan Mingzhen will introduce the function of silicone sealing ring.
 
1. Silicone sealing ring has a very good insurance effect, which can make food or other items that need to be kept fresh have a very good function of maintaining their freshness, and this product will not produce any harmful substances. It is a completely non-toxic and harmless green, healthy and environmentally friendly product.
 
2, silicone sealing ring it has extremely high quality sealing performance, can be completely sealed, will not let a drop of water into the sealed space inside.
 
3, silicone sealing ring it is also very strong adaptability to the environment, can be placed under the strong temperature after heating, can be very good to maintain its original shape and state, do not completely deformation, and in the high temperature environment will not produce any harmful substances.
 
4. Silicone sealing ring has excellent tensile resistance and can achieve the effect of no fracture and no deformation under very strong tensile force.
 
5, silicone seal it compared to the same type of products, it can be used for a long time, the color will not have any change, will not yellow, will not fade.
 
6. Silicone sealing ring has very good corona resistance, arc resistance and high temperature and low temperature resistance. In addition, silicone sealing ring also has good aging resistance. Very consistent with national standards.
 
Silicone sealing ring It has better elasticity than ordinary rubber, even at minus 60 or 70 degrees, it can maintain better elasticity.
 
8, but the silicone seal ring is not able to use in most of the thick shrinkage of the solvent and oil, or thick shrinkage of the acid and sodium hydroxide used.
 
Silicone sealing ring also has very good electrical insulation properties, even under high temperature conditions, it will not be affected in any way.
 
Silicone sealing ring advantages:

1, excellent weather resistance Si-O-Si bond in silicone rubber is very stable to oxygen, ozone and ultraviolet light, and has excellent resistance to ozone and oxide erosion. In the case of not adding any additives, it has excellent weather resistance, and even if it is used outdoors for a long time, cracks do not occur. It is generally believed that silicone rubber seals can be used outdoors for more than 20 years.
 
2, material safety and environmental protection silicone rubber has its unique physiological inertia, non-toxic, tasteless, odorless, good preservation effect, and less interference by the external environment, long-term use of yellow, do not fade. And in line with the national food and medical health standards, more used in food, medicine, aluminum paste and all kinds of oil filter to remove impurities. Organic silica gel has excellent electrical insulation properties, corona resistance and arc resistance are also very good.
 
3, high permeability and selectivity of gas permeability due to the molecular structure of silica gel so that the silicone seal has good permeability and gas selectivity, at room temperature silicone rubber on air, nitrogen, oxygen, carbon dioxide and other gases permeability than natural rubber 30-50 times higher.
 
4. The surface energy of the silicone ring with moisture absorption performance is low, which has the function of absorbing the moisture in the environment and plays the role of isolation.
 
5, a wide range of high and low temperature resistance: silicone sealing ring can be placed under high temperature heating without deformation does not produce harmful substances. It can be used almost forever at 150°C without performance change, can be used continuously for 10000 hours at 200°C, and can be used for a period of time at 350°C. Widely used in heat-resistant occasions, such as: hot water bottle sealing ring. Low temperature resistance: silicone rubber at -60 ℃ ~-70 ℃ still has good elasticity, some special formula of silicone rubber can also withstand more harsh very low temperature, such as: low temperature sealing ring, the lowest can reach -100 ℃.

1. The mechanical properties of tensile strength and tear strength are poor. It is not recommended to use silicone sealing ring for stretching, tearing and strong wear in the working environment. Normally, only static sealing is used.
 
2. Silicone rubber has good acid and alkali resistance, but it has no resistance to alkane hydrogen and aromatic oils. Therefore, it is not suitable for use in environments where the working pressure exceeds 50 pounds. In addition, it is not recommended to use silica gel seals in most concentrated solvents, oils, concentrated acids and diluted caustic solutions.
 
3. Silicone sealing ring, the manufacturing cost is relatively high.
 
In recent years, the silicone products industry continues to develop, a lot of silicone products have entered a new class, the quality of silicone products is also uneven, which requires consumers in the purchase of silicone products to have quality judgment.Dongguan Mingzhen Silicone Products FactoryShare the following areas for you to distinguish:
A: From the aspect of characteristic feel, the toughness and elasticity of silicone products are very good. They are not easy to deform permanently due to external force, and feel smooth, while fake silicone products are easy to deform and feel rough, because there is no layer of grease on the surface of fake silicone.
 
B: from the characteristics, silicone products are non-toxic, tasteless and colorless products, good texture, no harm to the human body, and the general fake silicone products are very that to achieve these effects, fake and shoddy silicone products are generally toxic and pungent smell!
 
C: We can also distinguish between true and false silica gel through flame combustion. Fake silica gel products produce black smoke and black powder when burning. No matter what color the real silica gel products produce white smoke and the burning residue is white powder.
Secondary vulcanization of silica gel products is also called secondary molding of silica gel products in the professional terminology of silica gel products factory. Generally speaking, secondary vulcanization is also called post-vulcanization. The function of secondary vulcanization: when silica gel is vulcanized with peroxide, low molecular compounds are generated after peroxide decomposition triggers polymer reaction, which will affect the mechanical properties of rubber. Moreover, silicone products in the first stage of heating molding, the crosslinking density is not enough, to make its further vulcanization reaction to increase the density of silica gel tensile strength, resilience, hardness, swelling degree, density, thermal stability than a vulcanization has greatly improved. If the second vulcanization is not carried out, the performance of the silicone products produced may be affected to a certain extent, and products with better performance cannot be obtained. The parameters of primary vulcanization may be different from those of secondary vulcanization, which is related to actual operation!
 
Silicone vulcanization has a variety of high temperature and room temperature. According to high-temperature silica gel, for example, before vulcanization, it is what we usually call raw rubber. Mixing rubber is to refine many additives such as vulcanizing agent, release agent, etc. together with raw rubber. It can be seen from the outside. With the hand a pull on the broken, no elasticity. If the mixed glue is vulcanized and molded at a certain temperature at a certain temperature, silicone products can be obtained, just like the silicone mobile phone sets we usually see.
However, many silicone products factories are not very clear about the concept of secondary vulcanization. For some silicone products with special requirements, they can only achieve a certain degree, but cannot really achieve the elasticity or tensile force required by the product itself. Secondary vulcanization can remove the peculiar smell of vulcanizing agent and various additives added in silicone rubber products;
 
Secondary vulcanization can reduce the size of silicone rubber products, the size of the product without secondary vulcanization is not very stable; secondary vulcanization can stabilize the physical properties of silicone rubber products, so that the density of the structure, tensile strength, resilience, hardness, swelling degree, density and thermal stability have been greatly improved.
 
Although the operation of the secondary vulcanization process is simple, it is necessary to comprehensively evaluate all the production processes of silicone rubber products during the secondary vulcanization, and reasonably arrange when the secondary vulcanization is carried out according to these production processes. If the operation is improper, it will affect the operation of the subsequent process.
 
For example, for silicone rubber products that need to be punched with a punching die, if the punching process is carried out first and then the secondary vulcanization process is carried out, the size of the product will be smaller after the secondary vulcanization process is completed, because the secondary vulcanization will shorten the size of the product, so the product that needs to be punched should be subjected to secondary vulcanization in punching, so as to ensure the stability of the size of silicone rubber products. Deep has many years of experience in the production of silicone products, can be customized to map samples, I believe it is a good choice for you!
 
The role of two-stage vulcanization: when silicone rubber is vulcanized with peroxide, the decomposition of peroxide causes the polymer reaction to generate low molecular compounds (such as benzene and benzoic acid) present in the rubber will affect the mechanical properties of the rubber. Moreover, after the silicone rubber is heated and molded in the first stage, its crosslinking density is not enough. To make it react further, it is necessary to increase the time or increase the temperature, which takes up the time of the mold and the vulcanizer and affects the efficiency.
 
In the two-stage vulcanization, peroxide is actually very small, mainly by oxygen to increase cross-linking. Therefore, the oven should be equipped with a blast device, and the glue should not be stacked too tightly. Low molecular substances such as HF released during a period of vulcanization of fluorine rubber will hinder rubber crosslinking, and high temperature will be released. Corrosion of metal parts, so also need two vulcanization.

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