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Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.

18 yearsFocus on R & D and production of silicone rubber products

Become a respected supplier of silicone rubber products

Service Hotline:

+86-136 6988 8704

Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.
18 years focus on silicone rubber products research and development and production
Professional customization

Dongguan Minz Rubber & Plastics Co., Ltd.

Add.: No.4, New Industrial Road, Shipai Tangwei, shipai town, Dongguan City
Tel: +86-0769-8665 2688
Fax: +86-796-8180 6477
Contact: Miss Li +86-136 6988 8704
Mailbox:lixiaoxia@dgminz.com.cn

Silicone sealing ring has good heat and cold resistance

Silicone sealing ring has good heat and cold resistance

2021-06-29 11:41:43

The main performance characteristics of silicone sealing ring:. 1, good heat resistance and cold resistance, can be used for a long time at -60~250 ℃ 2, ozone resistance, good weather resistance 3, good electrical function silica gel is a colloidal substance with solid characteristics, its basic component is silicon dioxide (SiO2), the physical structure of silica gel is rich micropores and high specific surface area, its appearance is silicon hydroxyl structure, therefore, it has a strong adsorption effect on water vapor or other substances and a selective adsorption separation ability. It is widely used in the fields of adsorption, drying, material separation, purification, high purity preparation, etc. In the field of chemical engineering, silica gel can be used as catalyst or catalyst carrier. Silicone because of its chemical composition and physical structure of the silicone key characteristics, in use has the following advantages:. 1, chemical stability, in addition to hydrofluoric acid (HF) and alkali, insoluble in any other solvents and solutions. 2. Good thermal stability. Type A fine porous silica gel can be used at temperatures within 300°C, while other types of silica gel can be used for a long time at high temperatures of 500-600°C. 3, silica gel has a rigid skeleton structure, with outstanding wear resistance and compressive strength. Silicone sealing rings are common products in life. Although they are small, they play a very important role. They play an important role in the sealing and preservation of certain products. How does the sealing ring turn collagen into a silicone seal. 1. Compression molding: Silicone rubber sealing ring has complex shapes, such as leather cups, sealing rings, etc., which are made by common molding methods. With the help of the mold, the silicone is put into the mold for heating, and then cooled and molded. 2. Injection molding: For more complex silicone rubber seals, such as tire treads, silicone hoses and steel wire surface coatings, injection molding is required. This is a continuous molding method, through various holes (also called templates) The silicone mixture is molded into the extruder funnel under internal thread extrusion. Before extrusion, the silicone must be preheated to make it soft and easy to extrude, to obtain a smooth surface and precise dimensions of the silicone seal ring.

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How the viscoelasticity of the silicone seal ring is composed

How the viscoelasticity of the silicone seal ring is composed

2021-06-29 11:12:32

The initial contraction of the O-ring seal operating at minus temperature may be reduced or completely disappeared due to the sharp drop in temperature. Under the condition of -50 ~-60 ℃, the rubber material that is not resistant to low temperature will completely lose the initial stress. Even for the rubber material that is resistant to low temperature, the initial stress at this moment will not be greater than 25% of the initial stress at 20 ℃, because the initial contraction of the silicone seal ring depends on the linear expansion coefficient. The pressure of the working medium is the main factor causing the deformation of the silicone sealing ring. The working pressure of modern hydraulic equipment is increasing day by day. The long-term high-pressure action of the sealing ring will deform the silicone sealing ring. Therefore, the design should be based on the working pressure. Appropriate pressure-resistant rubber materials, the higher the working pressure, the higher the hardness and high pressure resistance of the materials used. In order to improve the pressure resistance of the silicone sealing ring material and increase the elasticity of the material (especially to increase the elasticity of the material at low temperature and reduce the compression deformation of the material, it is generally necessary to improve the formula of the material and add plasticizer. However, if the silicone sealing ring with plasticizer is soaked in the working medium for a long time, the plasticizer will be gradually absorbed by the working medium, resulting in the volume shrinkage of the silicone sealing ring, it is even possible to cause negative compression of the silicone seal ring (I. e., a gap between the silicone seal ring and the surface to be sealed). Because the rubber material used in the silicone sealing ring belongs to the viscoelastic material, the compression amount and rebound blockage set in the initial stage can be used for a long time, resulting in permanent deformation and gradual loss, leakage, permanent deformation and elastic force disappearance are the main reasons for the loss of sealing function of the O-ring. Operating temperature is another important factor affecting the permanent deformation of silicone sealing ring. High temperature will accelerate the aging of rubber materials. The higher the operating temperature, the greater the permanent deformation of silicone sealing ring. When the permanent deformation is greater than 40%, the O-ring will lose its sealing ability and leak. The initial stress value formed in the rubber materials of silicone sealing ring due to contraction deformation, it will gradually decrease and disappear with the relaxation process of silicone sealing ring pressed by silicone keys and the effect of temperature drop.

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The reason why the rubber seal ring feels very important

The reason why the rubber seal ring feels very important

2021-06-29 10:50:34

Good elasticity, tear resistance, good resistance to neutral solvents, heat resistance: silicone rubber has much better heat resistance than ordinary rubber, has high wear resistance, and is worn on the surface of the working seal ring. The part has the function of automatic elastic compensation, thereby increasing the service life of the seal. Equipment and the use of sealing ring should pay attention:. (1) to avoid extended use, dynamic sealing rubber seals use period is generally 3000~5000h, should be replaced in a timely manner. (2) to avoid the use of old silicone sealing ring, the use of new sealing ring, but also carefully check the surface quality of the sealing ring, confirm that no small holes, protrusions, cracks and grooves and other shortcomings and meet the elasticity before use. (3) When replacing the sealing ring, strictly check the sealing ring groove, remove dirt, and polish the bottom of the groove. (4) Do not install the wrong direction and damage the lips. If there are scars of more than 50μm on the lips, it may cause significant oil leakage. (5) Avoid forcing the equipment to be knocked in with a hammer. Instead, special tools should be used to press the sealing ring into the seat hole first, and then a simple cylinder should be used to maintain the lip through the spline. Before the equipment, some lubricating oil should be applied to the lip to facilitate the equipment and avoid burns during initial work. Attention should be paid to cleaning. Silicone products, whether it is stretching, resilience, deformation and toughness strength are very important, if the above performance is basically a good material, O-ring is suitable for installed in a variety of mechanical equipment, at the specified temperature, pressure, and different liquid and gas medium, in the static or motion state from the sealing effect. Silicone sealing ring because of its environmental protection, and the use of a wide range of temperature, can be in the -60 degrees ~ 200 degrees temperature range of long-term use, so the use of more and more widely. Silicone sealing ring is not resistant to oil, and is not suitable for most thick-shrunk solvents, oil products, silicone key thick-shrunk acid and diluted sodium hydroxide.

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Why do silicone seals have different colors

Why do silicone seals have different colors

2021-06-23 10:28:57

Silicone sealing ring is widely used in sealing profession because of its excellent ductility and pressure resistance, and silicone keys can reasonably prevent the leakage of substances. What's more, it is widely used. Therefore, the natural environment in which it is used is often diversified and changeable. This is full of key reasons that cause the ineffectiveness of silicone sealing ring, in which rupture is a key situation of ineffectiveness, the break accounts for more than 80% of the total, so what are the reasons for the break of the silicone sealing ring. Each original data and product often has its own load, and silicone sealing ring is not included. For example, the rated load that silicone sealing ring can resist is 10N, while the natural environment at work will have 20N. Under such overload conditions, it is very simple to break. Therefore, when designing sealing ring products, it is necessary to check the relevant data to see how much the load of the product is, whether the product is in overload operation, generally not more than 90% of the product load is relatively good. The root cause of damage to the silicone seal ring. Embrittlement of raw materials of silicone sealing ring: in many cases, embrittlement of raw materials is also the key reason for rupture. each material often has its own service life. if embrittlement exceeds its own service life for a long time, it will break. if embrittlement occurs, the product will become hard and brittle, and then stress will occur on the vacancy to cause rupture. therefore, silicone sealing ring on mechanical equipment products needs to be embrittled and replaced immediately before rupture, prevent production accidents due to rubber ring rupture. 1) The color requirement of the general sealing ring is the customer's requirement. It is mainly required to distinguish from other sealing rings or to keep the color consistent with the supporting parts. It has nothing to do with the function. 2.) It has no effect on the function. Generally, silica gel is natural color, that is, semi-transparent color, and there are also transparent color. Color matching will not affect the function of silica gel itself. The main reason is that the composition of color paste is also silica gel, and the proportion added to the silica gel of the sealing ring produced by us is very small, with little fluctuation on the function.

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What are the benefits of using silicone seals at gear oil

What are the benefits of using silicone seals at gear oil

2021-06-18 17:23:42

The circulation system where the gas side flows into the oil side and flows into the air side from the oil side, the dragging surface is well moistened, which can avoid damage and expansion, thus there is no leakage. The basic theory of sealing is that there are layers of specific wetting films in the center of a dynamic soft sealing and mutual mating surface. Under all normal circumstances, this layer of wetting film is relied on to surpass the sealing purpose and add the service life of hydraulic seals. Silicone in silicone products is a natural raw material. Due to its strong softness and toughness, it can be made into different hardness and has been liked by everyone. More and more manufacturers have developed silicone products to make them flexible in seals, silicone tableware, silicone toys, silicone pet products, silicone household products, etc., and appear in various industries in different colors and shapes. Compared with the traditional materials in the market, silicone products have a long service life and do not need to be replaced frequently in the application. Especially in the application of seals, it is easy to produce wear problems. Silicone seals can avoid these problems well. At the same time, they will not produce deformation, yellowing and peculiar smell problems in the environment of up to 240 degrees, which can keep the density of silicone products unchanged in the original state, in this way, people will be stronger in the security of the application. Silicone sealing ring can be used in many articles because of its richness. Today, I want to talk to you about the use of silicone sealing ring on gear oil. Gear oil, as the sealing liquid, has the necessary steam pressure. When using silicone sealing ring, it is necessary that the ductility of silicone sealing ring is better, and it can be integrated into the deformation caused by such steam pressure and kneaded into shape. In the hydraulic transmission system, the damage of gear oil (liquid) to the sealing characteristics of hydraulic seals, in addition to the compatibility of material/rubber seals, the viscosity of refined oil, the change of viscosity with temperature, the rate of reciprocating (rotating) exercise, the working pressure and the material, strength, geometric appearance and surface lubrication of the shaft, engine cylinder or hydraulic cylinder, silicone keys and the structure of its hydraulic seals and other elements that damage the occurrence of the wetting film and the characteristics of the film all damage the actual sealing effect. Generally speaking, the occurrence of continuous wetting film can obtain the desired actual sealing effect.

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