A kind of preparation method of mq resin with narrow molecular weight distribution
A narrow molecular weight distribution and resin technology, which is applied in the field of MQ resin preparation with narrow molecular weight distribution, can solve problems such as MQ resins that have not been discussed, and achieve the effects of high product quality stability, narrow molecular weight distribution and high production efficiency.
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Embodiment 1
[0045] At 15°C, 40w.t.% aqueous sodium silicate solution (modulus 3.1) and 20w.t.% aqueous hydrochloric acid were mixed according to SiO 2 / HCl molar ratio = 0.5 to carry out the reaction. The static mixer in the reactor A is a SK type static mixer, the number of units is 20, the liquid flow rate is 5m / s, and the residence time is 0.4s. The aging reactor in Reactor A is a tubular reactor with a residence time of 30 min.
[0046] The product, isopropanol, hexamethyldisiloxane, trimethylchlorosilane, polyether silicone oil (molecular weight 2000, HLB value 1.5) in reactor A were 87.75kg / h, 20.25kg / h, 20.25 kg / h, 6.075kg / h, 0.675kg / h were continuously added to Reactor B. The reaction temperature of the reactor B was 80° C., the reaction pressure was 1 bar, and the end-capping reaction time was 120 min. The product of reactor B was sent to the continuous phase separator, and the residence time of the phase separator was 50 min. Finally, the organic phase separated by the phase...
Embodiment 2
[0048] At 30°C, 40w.t.% aqueous sodium silicate solution (modulus 3.1) and 20w.t.% aqueous hydrochloric acid were combined according to SiO 2 / HCl molar ratio = 0.6 to carry out the reaction. The static mixer in the reactor A is a SH type static mixer, the number of units is 10, the liquid flow rate is 8m / s, and the residence time is 0.125s. The aging reactor in Reactor A is a tubular reactor with a residence time of 20 min.
[0049] The product in reactor A, isopropanol, xylene, trimethylchlorosilane, vinyldimethylchlorosilane, polyether silicone oil (molecular weight 4000, HLB value 5) were respectively 87.75kg / h and 13.5kg / h. h, 13.5kg / h, 10kg / h, 9.57kg / h, 0.675kg / h were continuously added to reactor B. The reaction temperature of the reactor B was 70° C., the reaction pressure was 0.1 bar, and the end-capping reaction time was 180 min. The product of reactor B was sent to the continuous phase separator, and the residence time of the phase separator was 20 min. Finally,...
Embodiment 3
[0051] At 0°C, 40w.t.% aqueous sodium silicate solution (modulus 3.1) and 20w.t.% aqueous hydrochloric acid were combined according to SiO 2 / HCl molar ratio = 0.8 to carry out the reaction. The static mixer in the reactor A is a SL type static mixer, the number of units is 30, the liquid flow rate is 3m / s, and the residence time is 1s. The aging reactor in Reactor A is a tubular reactor with a residence time of 120 min.
[0052] The product, ethanol, toluene, hexamethyldisiloxane and polyether silicone oil (molecular weight 1000, HLB value 1) in reactor A were 87.75kg / h, 20.25kg / h, 13.5kg / h, 13.36kg respectively. / h, 0.135 kg / h was continuously added to reactor B. The reaction temperature of the reactor B was 110° C., the reaction pressure was 3 bar, and the end-capping reaction time was 30 min. The product of reactor B was sent to the continuous phase separator, and the residence time of the phase separator was 100 min. Finally, the organic phase separated by the phase s...
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