Hydrosilylation cured silicone resins plasticized by organophosphorous compounds
A technology of hydrosilylation and organic silicon, which is applied in the direction of synthetic resin layered products, chemical instruments and methods, transportation and packaging, etc. It can solve the problems of embrittlement of cured resin and reduction of mechanical flexibility.
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[0068] Methods for the preparation of organohydrogensiloxanes (eg, by hydrolysis and condensation of organohalosilanes) are also well known in the art. For example, an organohydrogenpolysiloxane resin can be prepared by combining a silicone resin with an organosilicon compound having an average of two to four silicon-bonded hydrogen atoms per molecule and a molecular weight of less than 1,000 in the presence of a hydrosilylation catalyst and optionally an organic solvent, provided that the silicone resin (a) has an average of at least two silicon-bonded alkenyl groups per molecule, and the silicon-bonded hydrogen atoms in (b) are the same as those of the alkenyl groups in (a) The molar ratio is 1.5 to 5.
[0069] Hydrosilylation catalyst of component (A)
[0070] In various embodiments, component (A) comprises (iii) at least one hydrosilylation catalyst. Component (A) may comprise a single hydrosilylation catalyst or a mixture comprising two or more different catalysts dif...
example
[0121] The present invention will be better understood by reference to the following examples, which are provided by way of illustration and which those skilled in the art will recognize are not intended to be limiting.
example 1
[0123] Silicone composition samples were prepared as follows: (i) silicone resin [Dow Corning (Dow Corning) Silicone Resin H, i.e. the average composition in the form of a toluene solution of 71.6% by weight was (VMe 2 SiO 1 / 2 ) 0.235 (Ph(OH)SiO 2 / 2 ) 0.036 (PhSiO 3 / 2 ) 0.729 polymer]; (ii) crosslinker [Dow Corning (Dow Corning) crosslinker I, ie phenyl tris (dimethylsiloxy) silane]; (iii) organophosphate compound [Suprestra Fyroflex RDP, ie Resorcinol bis(diphenyl phosphate)]; (iv) catalyst [Dow Corning Catalyst K, platinum complexed with divinyltetramethyldisiloxane and inhibited with triphenylphosphine (TPP) ]; mixed with (v) solvent (toluene). Each mixture was homogenized in a Hauschild mixer at 2400 rpm for 1 minute, and the mixed solution was divided into two parts. A part was poured into an aluminum pan and cured in an air-circulating oven. The curing temperature sequence was as follows: from room temperature to 100°C at 2°C / min, and kept at 100°C for 1 hour, the...
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