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A platform for research: civil engineering, architecture and urbanism
Preparation method of cellulose ether for gypsum mortar
The invention discloses a preparation method of cellulose ether for gypsum mortar, which is characterized by comprising the following steps: S1, putting refined cotton powder into a reaction kettle, replacing air in the reaction kettle, protecting with inert gas, and controlling the pressure in the kettle; s2, liquid caustic soda with the concentration of 32-50% is added, a reaction is conducted for 5-45 min, and the reaction temperature is controlled to be 20-45 DEG C; s3, adding a first-stage etherifying agent, controlling the pressure in the kettle to be 0.15-0.3 MPa, controlling the temperature to be 30-50 DEG C, and reacting for 40-90 minutes; s4, adding a second-stage etherifying agent, a low-boiling-point ether substance and a low-carbon alcohol substance; s5, the reaction pressure is increased to 1.7-2.2 Mpa, and a reaction is carried out under the pressure; s6, recycling; and S7, post-processing. The product prepared by the invention has the advantages of gypsum universality, reduction of gypsum layering and cracking, prolongation of gypsum opening time, reduction of water consumption and coagulation time difference among gypsum batches, few bubbles and fast thickening.
本发明公开了一种用于石膏砂浆的纤维素醚的制备方法，其特征在于，包括以下步骤：S1将精制棉粉末投入反应釜内，置换反应釜内空气，用惰性气体保护，控制釜内压力；S2加入浓度32～50％的液碱，反应5～45min，反应温度控制在20～45℃；S3再加入一阶段醚化剂，釜内压力控制在0.15～0.3MPa，温度控制在30～50℃，反应时间40～90min；S4加入二阶段醚化剂及低沸点醚类物质和低碳醇类物质；S5将反应压力提升至1.7～2.2Mpa，在此压力下反应；S6回收；S7后处理。本发明制备的产物具备下述优点：具有石膏普适性，降低石膏分层、开裂，延长石膏开放时间，减小石膏批次间用水量、凝结时间差异、气泡少、增稠快。
Preparation method of cellulose ether for gypsum mortar
The invention discloses a preparation method of cellulose ether for gypsum mortar, which is characterized by comprising the following steps: S1, putting refined cotton powder into a reaction kettle, replacing air in the reaction kettle, protecting with inert gas, and controlling the pressure in the kettle; s2, liquid caustic soda with the concentration of 32-50% is added, a reaction is conducted for 5-45 min, and the reaction temperature is controlled to be 20-45 DEG C; s3, adding a first-stage etherifying agent, controlling the pressure in the kettle to be 0.15-0.3 MPa, controlling the temperature to be 30-50 DEG C, and reacting for 40-90 minutes; s4, adding a second-stage etherifying agent, a low-boiling-point ether substance and a low-carbon alcohol substance; s5, the reaction pressure is increased to 1.7-2.2 Mpa, and a reaction is carried out under the pressure; s6, recycling; and S7, post-processing. The product prepared by the invention has the advantages of gypsum universality, reduction of gypsum layering and cracking, prolongation of gypsum opening time, reduction of water consumption and coagulation time difference among gypsum batches, few bubbles and fast thickening.
本发明公开了一种用于石膏砂浆的纤维素醚的制备方法，其特征在于，包括以下步骤：S1将精制棉粉末投入反应釜内，置换反应釜内空气，用惰性气体保护，控制釜内压力；S2加入浓度32～50％的液碱，反应5～45min，反应温度控制在20～45℃；S3再加入一阶段醚化剂，釜内压力控制在0.15～0.3MPa，温度控制在30～50℃，反应时间40～90min；S4加入二阶段醚化剂及低沸点醚类物质和低碳醇类物质；S5将反应压力提升至1.7～2.2Mpa，在此压力下反应；S6回收；S7后处理。本发明制备的产物具备下述优点：具有石膏普适性，降低石膏分层、开裂，延长石膏开放时间，减小石膏批次间用水量、凝结时间差异、气泡少、增稠快。
Preparation method of cellulose ether for gypsum mortar
一种用于石膏砂浆的纤维素醚的制备方法
WANG XIAOMING (author) / SHEN YIMING (author) / GAO ZHUANZHUAN (author) / WANG YUECHUN (author) / CHEN JIANYUAN (author) / LI BO (author) / SHAO JIAQI (author)
2024-11-15
Patent
Electronic Resource
Chinese
Modified cellulose ether, light plastering gypsum and preparation method thereof
| European Patent Office | 2023