Copolymer, dispersant, and dispersion composition
A technology of copolymers and dispersants, applied in the field of copolymers, to achieve the effect of improving dispersion and slump retention
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Embodiment 1～ Embodiment 14， comparative example 1～ comparative example 4
[0141]120 g of ion-exchanged water was poured into a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, a cooling pipe, and a nitrogen introduction pipe, and the inside of the reactor was replaced with nitrogen while stirring, and then the temperature was raised to 80°C. A mixture of 200 g of monomers and 100 g of water and a mixture of 4 g of ammonium persulfate and 80 g of water mixed in the ratio shown in Table 1 were simultaneously added dropwise to the reactor maintained at 80° C. over 2 hours. After completion of the dropwise addition, it was further kept at 80° C. for 2 hours. Then, it was cooled to 40° C., and neutralized to a pH of 7.0 to 7.5 using 24% aqueous sodium hydroxide solution, thereby obtaining Examples 1 to 14 and Comparative Examples having Mw and Mw / Mn shown in Table 1, respectively. The aqueous solution of the copolymer of Example 1-Comparative Example 4.
[0142] Regarding the monomers in Table 1, A-1 to A-5 and B-1 to B-5 are the...
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