Polyether toughened epoxy resin raw material preparation solution

Overspending Polymers (HBP) are characterized by the extremely high degree of branching of their branched repeating units and the large number of functional end-ends on the surface of polymer nuclear shell structures. Because a highly brosed structure prevents chain tangles, overspending polymers usually show a lower viscosity in the molten state or solution. The performance of overspending polymers is mainly affected by a large number of end-base, so end-base modifiing can obtain overspending polymers for different purposes. Recently, the industry carried out experiments on reactive nuclear shell overspending insertion copolymerated epoxy resins with the aim of co-preparing nano-new onion-type overspending polyethers using epoxy propylene alcohol and anion opening ring of propylene oxide for use as a new softener and toughener for thermoset resins. In order to obtain good compatibility, lower viscosity, better interface adhesion and phase separation, the polarity and active design of overspending polyether are studied. In this experiment, the preparation of raw materials is very critical, this trick has been
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experts
detailed explanation.
raw materials in place, the first is the preparation of end-base changes. Step 1 Preparation of 36P21 and 35P26: 200g (12.0mmol; 1.03 mol mol hydroxycodone) overspended inlay co-polymers mixed with 83g (0.50mol) parabens and heated to 160C, with a constant temperature response of 14d. Continuously passing on human nitrogen to take away the ethanol produced in the reaction; the amount of ethyl hydroxybenzene can convert 49% of the end hydroxyl into phenol. Add 2.0mL dibutyltin (DBTDL.2.1g, O.5% mass fraction) as a catalyst; Base-leveled HPP 36P21 with 16.4g (0.055mol) methamphetrate, 0.3mL catalyst DBTDL (0.3g, 0.4% mass fraction) and a constant temperature reaction of 6d at 160C. Chemical metering was used to control the end-base conversion rate of 24.2%, which theoretically led to 21 alkyl chains on the superspending segment co-cluster end-base; The resulting yellow high mucus product 35P26 is degassed by decompression.
1st step preparation 22E22 and 6E40: in order to attract primary reactive epoxy end-base, 139g (8.05mmol; 0.10mol phenol)phenol Base function inlay co-concentration 36P21 dissolved in 1.5L DMF, then added 194g (1.4mol) waterless K2C03 and 110mL (110mL) 130g, 1.4mol) epoxy chloropropane; the active mixture, under mechanical stirring and nitrogen atmosphere conditions, reacts at a constant temperature of 10h at 60 degrees C, filters out inorganic salts from the reaction product, then decompresses the solvent, dissolves the residue with dichloromethane and washes it 3 times; and uses waterless MgS04 to dry the organic phase and obtains a viscous pale yellow oil product 22E22 after vacuum removal of the solvent. Step 3 Preparation PPO 6E4: For comparative experiments, the end hydroxyl of the six-arm star polypropylene/ethylene oxide segment copolymer Baygal was completely converted into a phenolic base, and then the phenolic ring oxidation was obtained using the same method as the synthetic overspending segment copolymers mentioned above, and finally the ethylene oxide-type PPO 6E4,
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experts
that it is a sticky yellow liquid product.
4th step preparation 18E31,
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Introduced the process: 130g (7.6 mmol; O.67mol hydroxyl) overspending segment Copolymers with 66g (0.22mol) methamphetamine, 1.4g catalyst DBTDL (O.5%), at a constant temperature of 160c 8d; The amount of methamphetamine can be modified to 33% of the end hydroxyl on the superspending inlay. The resulting viscous product is degassed by vacuum, and then further modified with 47g (0.28mol) parabens, using the same method as the previous 36P21 modified method; The amount can be modified to the initial hydroxyl of 42% of the total polymer in the overspending segment, and finally, as in the previous method, the modified overspending polymer is cyclooxidized with epoxy chloropropane to obtain the sticky orange liquid product "18E31".
the preparation of the epoxy mix after completing the above steps. Each polymer modifier is combined with 22.5g and 240g BPA CY225 to mix 45min in a Moheni Planimax high-speed shear mixer at 1000Pa and 80C, allowing the polymer to dissolve fully and reduce residual moisture. Then, add 190g Hardener HY 925 to obtain a 450g mixture. Stir for another 30min at 1000Pa and 80C. The resulting resin is poured into a mold of 200mm×200mm×4mm, curing reaction 2h at 120C, then drying 8h at a constant temperature of 140C in a ventilated drying box, and finally obtaining a mixture of epoxy with a polymer modifier with a mass fraction of 5%. All blends containing polymer modifiers with a mass fraction of 2.5% or 5% are prepared in this way. The blend containing HBP 35P26 is pre-gel 18h at 80 degrees C before curing in the mold. For each polymer modifier, the actual dosage of the resin and curing agent is calculated according to the number of active end-base of the official modifier used. The chemical measurement ratio between the epoxy group (on BADGE or modifier) and the official energy group (on the phenolic base) of its reaction remains constant. The symptoms of epoxy meth are based on TEM and aesthetic tests widely used in the literature. '
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