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Reactive extrusion preparation method of ultra-slow-release solid polycarboxylate water reducer
A reactive extrusion preparation method of an ultra-slow-release solid polycarboxylate water reducer comprises the following steps: putting isopentenol polyoxyethylene ether into a melting mixing tank, conducting heating for melting, adding unsaturated carboxylic acid, acrylate and a chain transfer agent, and conducting uniform stirring and mixing; extruding the blend through a double-screw extruder, adding half of an initiator into a first feeding hole, adding the rest half of the initiator into a second feeding hole after 3 minutes, keeping the temperature of the screw extruder at 75 DEG C,and keeping the material in a screw cylinder for 7-10 minutes; and after 6 min, adding a powdery alkali into a third feeding port, and discharging a finished product after the finished product is crushed in a cryogenic crusher through a discharging port. The reactive extrusion method is adopted for bulk synthesis, the solid polycarboxylate water reducer with the solid content reaching 98% or abovecan be prepared, and the prepared ultra-slow-release solid polycarboxylate water reducer is basically consistent with similar products synthesized through a traditional intermittent kettle type aqueous solution method in performance.
本发明的超缓释型固体聚羧酸系减水剂的反应性挤出制备方法，包括步骤：将异戊烯醇聚氧乙烯醚投入熔融混合罐并加热熔融，然后加入不饱和羧酸、丙烯酸酯和链转移剂搅拌混合均匀；将共混物经双螺杆挤出机挤出，同时在第一加料口加入一半的引发剂，3min后在第二加料口加入剩余的一半引发剂，螺杆挤出机的温度保持为75℃，物料在螺筒中停留时间为7～10min；6min后在第三加料口加入粉碱，成品经出料口到深冷粉碎机破碎后出料。本发明采用反应性挤出法进行本体合成，能制备固含量达到98％以上的固体聚羧酸系减水剂，所制备的超缓释型固体聚羧酸系减水剂与传统的间歇釜式水溶液法所合成的同类产品相比，性能基本一致。
Reactive extrusion preparation method of ultra-slow-release solid polycarboxylate water reducer
A reactive extrusion preparation method of an ultra-slow-release solid polycarboxylate water reducer comprises the following steps: putting isopentenol polyoxyethylene ether into a melting mixing tank, conducting heating for melting, adding unsaturated carboxylic acid, acrylate and a chain transfer agent, and conducting uniform stirring and mixing; extruding the blend through a double-screw extruder, adding half of an initiator into a first feeding hole, adding the rest half of the initiator into a second feeding hole after 3 minutes, keeping the temperature of the screw extruder at 75 DEG C,and keeping the material in a screw cylinder for 7-10 minutes; and after 6 min, adding a powdery alkali into a third feeding port, and discharging a finished product after the finished product is crushed in a cryogenic crusher through a discharging port. The reactive extrusion method is adopted for bulk synthesis, the solid polycarboxylate water reducer with the solid content reaching 98% or abovecan be prepared, and the prepared ultra-slow-release solid polycarboxylate water reducer is basically consistent with similar products synthesized through a traditional intermittent kettle type aqueous solution method in performance.
本发明的超缓释型固体聚羧酸系减水剂的反应性挤出制备方法，包括步骤：将异戊烯醇聚氧乙烯醚投入熔融混合罐并加热熔融，然后加入不饱和羧酸、丙烯酸酯和链转移剂搅拌混合均匀；将共混物经双螺杆挤出机挤出，同时在第一加料口加入一半的引发剂，3min后在第二加料口加入剩余的一半引发剂，螺杆挤出机的温度保持为75℃，物料在螺筒中停留时间为7～10min；6min后在第三加料口加入粉碱，成品经出料口到深冷粉碎机破碎后出料。本发明采用反应性挤出法进行本体合成，能制备固含量达到98％以上的固体聚羧酸系减水剂，所制备的超缓释型固体聚羧酸系减水剂与传统的间歇釜式水溶液法所合成的同类产品相比，性能基本一致。
Reactive extrusion preparation method of ultra-slow-release solid polycarboxylate water reducer
一种超缓释型固体聚羧酸系减水剂的反应性挤出制备方法
CHEN GUOXIN (author) / DU ZHIQIN (author) / WEN JINBAO (author) / TANG XIUSHENG (author) / ZHU YERAN (author) / LU JIAN (author)
2020-12-04
Patent
Electronic Resource
Chinese
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