Phenyl Silicone Resin with Excellent Performance
Apr 3, 2023
Silibase Silicone resin is mainly used to prepare silicone insulating paint, silicone coating, silicone adhesive and silicone plastic. High performance coatings such as high-grade building exterior wall coatings are the main market of silicone resin, and the main varieties are modified polyester and modified acrylic resin.
Phenyl silicone resin is a silicone resin made by hydrolysis and polycondensation of PhSiX3 (X = Cl, OMe, OEt, etc.). Using the general hydrolysis polycondensation method, the phenyl silicone resin prepared by PhSiC'3 [or PhSi(OR)3] is too thermoplastic and has no practical use. However, the polymer containing phenylsilsesquioxane unit structure (PhSi01.s) was obtained by hydrolyzing PhSiC'3 under specific conditions and then undergoing an equilibrium rearrangement reaction. It has good comprehensive performance and has been practically applied.
If PhSiCb is hydrolyzed in a 5% dilute solution, mainly low molar mass polycondensates are formed. The condensation polymer is heated and reacted at 250°C under KOH catalysis to form a benzene ladder polymer with a molar mass as high as 400X such as g/mol.
In the presence of a basic catalyst, the high molar mass benzene ladder polymer will be depolymerized to obtain a low molar mass benzene ladder polymer terminated by the tibial group. This oligomer can be used as an intermediate to introduce a benzene ladder structure into other polymers for modification. When the benzene ladder oligomer interacts with Me2SiC!z, MePhSiClz 1 or chlorine-terminated polydimethylsiloxane, an insulating material with excellent performance can be obtained.
When PhSiCb is hydrolyzed, a low molar mass polymer containing a tibial group is first formed, and the low molar mass polymer undergoes intramolecular or intermolecular condensation reaction to form a high molar mass cyclic polymer, phenyl ladder polysiloxane, with a molecular weight of 106 'High temperature resistance of 650°C, glass transition temperature of 300~400°C. The benzene ladder polymer is different from the silicone resin with a three-dimensional structure. It has a ring structure and can be dissolved in organic solvents such as benzene, tetrahydrofuran, and dichloromethane, and can be cast into a colorless, transparent, and tough film. Does not melt.
It has excellent heat depolymerization resistance, and its heat aging resistance in steam is almost the same as that in air, and it begins to lose weight only when it is heated to 525°C in air. The tensile strength is about twice that of the corresponding ordinary silicone resin, reaching 27. 4~41. ZMPa, and has excellent electrical properties. The intrinsic viscosity of the benzene ladder polymer obtained in this way is 4.0, and the molar mass is 40×1 μ g/mol (light scattering method).
Co-hydrolysis of PhSiCb, PhCl2 and SiCl1 in a mixed solvent of toluene and butanol can also obtain phenyl silicone resin with excellent properties.
Silibase Silicone currently including below silicone resins: Methylphenyl Silicone Resin Emulsion, Methylphenyl Silicone Resin Intermediate, Epoxy Modified Silicone Resin, Acrylic Modified Silicone Resin, Acrylic Modified Methylphenyl, Silicone Resin Emulsion.
