Macromolecule Copolymerization Modification Method
Apr 25, 2023
The macromolecular copolymerization modification method is a method of preparing organosilicon modified polyols by starting from siloxane intermediates containing SiOH or SiOR and conducting condensation reactions with pre made polyols containing C-OH groups.
Synthesis process of silicone modified polycarbonate resin:
The synthesis of polyester resin prepolymers involves the addition of polyols such as trimethylpropanol, diethylene glycol, and neopentyl glycol, as well as binary acids such as phthalic anhydride, terephthalic acid, adipic acid, azelaic acid, and reflux xylene to a three necked flask according to the formula. The mixture is heated to 12o · c. After all the materials are melted, stirring is started and the temperature is raised. The reflux reaction is carried out at 180-22o · c until the acid value is 10-40mgKOH/g, and the temperature is lowered to 12o · c. Butyl acetate is added Ethylene glycol ethylene tyroacetic acid as a diluent, formulated into a resin with an 80% solid content, cooled, discharged, and ready for use.
The synthesis of organic silicon intermediates involves feeding phenylchlorosilane, methylchlorosilane, toluene, butanol, and water according to the formula, conducting water alcoholysis and condensation, and diluting with xylene solvent to form an organic silicon intermediate with a solid content of 65%.
Preparation of Organosilicon Modified Polypropylene Resin: Add the aforementioned polymer resin, silicone alcohol, and catalyst into a three necked bottle according to the formula amount, stir them up, raise the temperature, polymerize at 140 180 ° C to a certain acid value and viscosity, lower the temperature, add solvent to dilute to a solid content of 60%, cool and discharge to obtain Organosilicon Modified Polypropylene Resin.
Performance indicators of organosilicon modified polycarbonate resin
There is also a patent disclosure, which states that starting from the intermediate of burnt oxygen based silicone resin and the polymer containing tibia, a one-step continuous new process can be adopted under acid catalysis to produce a modified silicone resin with low curing temperature, good heat resistance, and mechanical properties.
Organosilicon intermediates (oligomers) containing alkoxy groups (Si-OR ')
The intermediate can be obtained solely from RSiCb or through water alcoholysis reaction with Min SICl2 (R is the firing group and aryl group) in the presence of organic solvents. The production of this type of silicon modified poly (vinyl alcohol) is generally carried out by first synthesizing a pre polymer containing a tibial group, and then adding an organic silicon intermediate containing a burnt oxygen group to the pre polymer. From the perspective of process control, it is only after a certain stage of reaction of the polymer prepolymer that organic silicon intermediates can be added, leading to a co condensation reaction with the polymer prepolymer. Due to the relatively easy control of the reaction, and the current domestic data also indicates that there are more cases of using this type of intermediate system to prepare silicon modified polyolefins. Generally, organic silicon intermediates containing methoxy (C-pressure H-) or ethoxy (CH formula H2 (} -) are selected.
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