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News > Dynamic industry > Application of silicone oil in silicone sealant

Application of silicone oil in silicone sealant

With the rapid development of industrial and construction of our country, the silicone sealant as a new in - situ caulking, the elasticity of the adhesive joints, room temperature curing sealing material and its application field of increasingly widespread. Silicone sealant is composed of basic polymer, crosslinking agent, filler, coupling agent, plasticizer, etc..
With the aggravation of the competition between the enterprise and promotion of the production technology of silicone sealant, some manufacturers in order to reduce the cost by white oil instead of dimethyl silicone oil as the silicone seal of the plasticizer. In the silicone sealant using a lot of white oil instead of silicone oil, the consequence is greatly reduced the many properties of silicone sealant, such as weather resistance, resistance to high and low temperature, and high performance silicone sealant properties. This makes the high durability, high performance of silicone sealant performance and service life is greatly reduced. Such shortening sealant used for engineering, aging resistance performance is poor, large volume shrinkage, prone to cracking sealant, brittle hard wait for a phenomenon, the influence of curtain wall sealing and appearance and even lead to serious accidents.
Dimethyl silicone oil is a colorless, odorless and transparent liquid, its molecular formula is mainly composed of dimethyl siloxane segment composition, structure and silicone sealant based polymers is very similar to the, so with the gum base has a good compatibility. Two methyl silicone oil, non-toxic, non volatile, with good chemical stability. In the wide temperature range, the change of viscosity is small, and the boiling point is high, the freezing point is low, and the temperature range of the liquid is wide, which can be used in -50 ~ 200. Two the electric properties of methyl silicone oil is good, especially in the frequency range of the factors. Its surface tension is small, the shear resistance is excellent. Based on the above excellent properties, two methyl silicone oil is particularly suitable for the use of silicone sealant as plasticizer and diluent.
In the application of silicone sealant, considering the construction, often need to adjust the sealant viscosity, lower the viscosity of the adhesive, improving the construction flow and the lubrication of the adherends, and therefore the choice of dimethyl silicone oil as a plasticizer. At the same time, join the plasticized agent can cured adhesive comprehensive performance improvement, improve adhesive joints of high impact resistance, anti fatigue performance etc..
On the other hand, the addition of plasticizer will have an effect on the other properties of silicone sealant. The tensile strength of the silica gel decreases gradually with the increase of the amount of the plasticizer, and the elongation at break is increasing. The reason is that the addition of the non reactive two methyl silicone oil plasticizer reduces the number of connections between the polymer chains, which leads to the decrease of the crosslinking density, which leads to the decrease of the tensile strength. In addition, the decrease of the crosslinking density of the three-dimensional structure of the stiffness, the molecules easily slip, resulting in an increase in elongation at break. In addition, with the increase of the amount of plasticizer, the adhesive strength of the adhesive is generally lower. The reason is that the plasticizer is a non reactive plasticizer, and the dilution of the active molecules of silica gel can decrease the number of active groups in the unit volume.
In order to adapt to the future construction of more large-scale development, maintain silicone sealant market growth, enterprises should continuously improve product quality, enhance the capacity for sustained development abide together industry self-regulation and standardization of the market. Dimethyl silicone oil as plasticizing agent has in the silicone sealant has been widely used, with white oil instead of silicone oil as the plasticizer may significantly reduce the performance of silicone sealant. In engineering, should refuse to use white sealant, silicone sealant selection.

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