A kind of unsaturated polyether, photocurable resin and preparation method thereof
An unsaturated and polyether technology, applied in the field of unsaturated polyether, photocurable resin and its preparation, can solve the problem of long curing time, and achieve the effect of fast photocuring speed, excellent adhesion performance and simple synthesis
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[0023] In this specific embodiment, a preparation method of unsaturated polyether is provided, comprising the following steps: adding propylene glycol or butanediol as an initiator in a reaction vessel, adding an active metal cation catalyst, vacuum dehydration treatment, and passing in an inert gas , adding a chain extender to the reaction vessel, the chain extender is a glycidyl ether containing unsaturated bonds, a glycidyl ester containing unsaturated bonds, a photoactive glycidyl ether or a photoactive glycidol Esters; control the temperature of the reaction system at 0-140°C, and carry out ring-opening polymerization for 0.5-3 hours at a stirring speed of 300-500 rpm to prepare unsaturated polyether.
[0024] The chain extender is a mixture of one or more of glycidyl methacrylate, glycidyl acrylate, and allyl glycidyl ether.
[0025] The active metal cationic catalyst is sodium hydroxide, antimony pentachloride, tin tetrachloride, tin tetrachloride + trifluoroacetic acid...
Embodiment 1
[0041] Weigh 0.1 mol (7.609 g) of propylene glycol and 0.8529 g of potassium hydroxide (active cationic catalyst) and add them into the reaction vessel. Vacuum dehydration at 80°C for 30 min. Nitrogen gas was introduced to maintain a certain nitrogen flow rate. Slowly add 0.6 mol (85.29 g) of glycidyl acrylate dropwise into the reaction vessel, and the dropping time is controlled within 30-60 minutes. After the glycidyl acrylate was added dropwise, the reaction was continued for 1 h. Stop heating, and neutralize the system with 0.1mol / L phosphoric acid aqueous solution until the pH of the system is neutral. Add 20ml of deionized water, stir at room temperature for 30min, distill under reduced pressure to remove the water in the system, wash the system with petroleum ether, and distill under reduced pressure to remove the petroleum ether in the system to obtain a hydroxyl-terminated unsaturated polyether.
[0042] Such as figure 1 Shown is the NMR spectrum of the prepared h...
Embodiment 2
[0047] Weigh 0.17mol (12.94g) of propylene glycol into the reaction vessel, and vacuum dehydrate at 80°C for 30min. Nitrogen gas was introduced to maintain a certain nitrogen flow rate. Cool down to 65°C, add 1.135ml of cocatalyst trifluoroacetic acid into the reaction vessel, add 0.800ml of catalyst anhydrous tin tetrachloride into the reaction vessel, slowly add 1.02mol (145g) glycidyl acrylate dropwise into the reaction vessel For ester, the dropping time is controlled within 30-60min. After the glycidyl acrylate was added dropwise, the reaction was continued for 4h. Stop heating, add 150ml of dichloroethane, and let stand overnight (stand for about 24h). Filter to remove the lower layer liquid. Wash three times with methanol aqueous solution of disodium ethylenediamine tetraacetate, distill under reduced pressure, remove dichloroethane and water in the system, and obtain unsaturated polyether with terminal hydroxyl groups.
[0048] The hydroxyl-terminated unsaturated p...
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