Preparation method for polyethylene glycol mono alkyl ether unsaturated carboxylic ester
A polyethylene glycol monoalkyl ether, unsaturated technology, applied in the field of preparation of polyethylene glycol monoalkyl ether unsaturated carboxylate, can solve the problem of short one-step process route, long two-step process route, Reduce the one-step reaction temperature and other problems to achieve the effect of simplifying the process
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Embodiment 1
[0022] Put 200g of methyl acrylate and 0.8wt% of the catalyst relative to the total weight of methyl acrylate and ethylene oxide into the dry reactor with stirring, electric heating jacket and internal water-cooled coil, relative to methyl acrylate and A polymerization inhibitor with a total weight of 0.5 wt% of ethylene oxide is added, and the reaction kettle is sealed. The autoclave was purged with nitrogen and then evacuated, and this was repeated three times. Turn on the stirring, heat to 80°C and maintain this temperature, slowly pass in 23.23 moles of ethylene oxide (that is, the molar ratio of methyl acrylate to EO is 1:10), and maintain by controlling the feeding rate of ethylene oxide The reaction pressure was 0.9 MPa, and it took 6 hours to pass the above amount of ethylene oxide (that is, the reaction time was 6 hours). Maturation at the reaction temperature for 1 hour, and then cooling to 60° C. and vacuum treatment under a pressure of -0.07 MPa for 10 minutes, sto...
Embodiment 2
[0024] [Example 2] to [Example 9] and [Comparative Example 1] and [Comparative Example 2]
[0025] In addition to the type of unsaturated carboxylic acid ester shown in formula (I), the composition of the catalyst, the amount of the catalyst, the composition of the polymerization inhibitor, the amount of the polymerization inhibitor, the reaction temperature, the reaction pressure, the number of moles of EO (or the formula ( I) The molar ratio of unsaturated carboxylic acid ester to EO is shown) and the reaction time is changed. Other operating conditions are the same as in Example 1.
[0026] In order to facilitate comparison, the important preparation conditions are listed in Table 1, and the product yield, number average molecular weight Mn, dispersion coefficient PD and iodine value are listed in Table 2.
[0027] It can be seen from the comparison of Comparative Example 1 and Comparative Example 2 with Example 1 that SnCl 2 Or BF 3 The reaction time of single-component catalyst ...
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