Storage-stable one-part room-temperature curable compositions on the basis of organosilicon compounds
A technology for organosilicon compounds and compositions, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of reducing the formation time of composition films
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[0173] In the examples described below, all viscosities are measured at a temperature of 25°C unless otherwise stated. Unless otherwise stated, the following examples are at ambient atmospheric pressure, i.e., at 900-1,100 hPa, and at room temperature, i.e., at about 23° C., or when the reactants are mixed without additional heating or cooling generated temperature and at about 50% relative humidity. All parts and percentages data are by weight unless otherwise indicated.
[0174] According to DIN 54458, the rheology of curable compositions is determined using amplitude scanning with a plate-plate array. The plate had a diameter of 25 mm and was used at 25° C. with a gap width of 0.5 mm and a frequency of 10 Hz.
[0175] Viscosity η* (γ=0.1%) refers to the complex viscosity [mPa·s] according to DIN 54458 at a deformation of 0.1%. Viscosity η* (γ=100%) refers to the complex viscosity [mPa·s] according to DIN 54458 at a deformation of 100%. The pour point is the critical she...
Embodiment 1
[0183] 500 g of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 80,000 mPa·s, 150 g of trimethylsilyl-terminated polydimethylsiloxane with a viscosity of 1,000 mPa·s and 22 g of n-propyl A homogeneous preblend of methyltriacetoxysilane and 10 g of methyltriacetoxysilane was mixed in a planetary mixer for 5 minutes. Subsequently, the specific surface area of 60g is 150m 2 / g of fumed silica (can be trademarked V15 (commercially available from Wacker Chemie AG, Germany) was incorporated into the mixture. After 20 minutes of homogenization in vacuo, 0.4 g of di-n-butyltin diacetate are admixed in vacuo. The resulting composition is then filled into moisture proof containers for further storage. After 4 weeks of storage at 5°C, the composition remained homogeneous and did not show any crystals.
Embodiment 2
[0185] 520 g of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 80,000 mPa·s, 150 g of trimethylsilyl-terminated polydimethylsiloxane with a viscosity of 1,000 mPa·s and 32 g of partially low A homogeneously crosslinked mixture of poly(containing 30 mole % of methyltriacetoxysilane, 47 mole % of n-propyltriacetoxysilane, 22 mole % of the dimer of said silane and 1 mole % of all higher oligomers of the silanes) were mixed in a planetary mixer for 5 minutes. Subsequently, the specific surface area of 60g is 150m 2 / g of fumed silica (can be trademarked V15 (commercially available from Wacker Chemie AG, Germany) was incorporated into the mixture. After 20 minutes of homogenization in vacuo, 0.4 g of di-n-butyltin diacetate are admixed in vacuo. The resulting composition is then filled into moisture proof containers for further storage. After 4 weeks of storage at 5°C, the composition remained homogeneous and did not show any crystals.
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