Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method for in-situ generation of polyvinyl alcohol emulsion modified cement paste
The invention relates to the technical field of building materials, and particularly discloses a preparation method for in-situ generation of polyvinyl alcohol emulsion modified cement paste, which comprises the following operation steps: adding methanol, vinyl acetate and hydroxyethyl methylacrylate into a reaction kettle, heating to 60-70 DEG C, and adding azodiisobutyronitrile for reaction; cooling to room temperature, adding an alcoholic solution of sodium methoxide while stirring, and reacting in a closed state for at least 30 minutes; raising the temperature to 70-80 DEG C, adding the pre-irradiated ethylene-vinyl acetate copolymer emulsion and organic boric acid, starting air exhaust, and stirring for reaction; pre-stirring the cement, the sand, the additive and part of the water, slowly adding into the system obtained in the previous step, slowly stirring while adding the rest of the water, and quickly stirring after the rest of the water is completely added until all the components are uniformly distributed. The preparation of the polyvinyl alcohol modified cement paste is realized by a one-pot method, the operation is simple, and the product is low in consistency, good in fluidity and good in toughening and reinforcing effects.
本发明涉及建筑材料技术领域，具体公开了一种原位生成聚乙烯醇乳液改性水泥浆的制备方法，包括如下操作步骤：向反应釜中加入甲醇、醋酸乙烯酯和甲基丙烯酸羟乙酯，加热到60‑70℃并加入偶氮二异丁腈反应；降至室温后搅拌下加入甲醇钠的醇溶液，密闭反应至少30min；升温至70‑80℃并添加预辐照后的乙烯‑醋酸乙烯共聚乳液及有机硼酸，开启排风并搅拌反应；将水泥、砂、添加剂及部分水预搅拌后缓慢加入到上一步所得的体系中，边添加剩余部分的水、边缓慢搅拌，待剩余部分的水添加完毕后快速搅拌，直至各组分分布均匀。本发明一锅法实现了聚乙烯醇改性水泥浆的制备，操作简单且产物稠度低、流动性好，增韧、增强效果佳。
Preparation method for in-situ generation of polyvinyl alcohol emulsion modified cement paste
The invention relates to the technical field of building materials, and particularly discloses a preparation method for in-situ generation of polyvinyl alcohol emulsion modified cement paste, which comprises the following operation steps: adding methanol, vinyl acetate and hydroxyethyl methylacrylate into a reaction kettle, heating to 60-70 DEG C, and adding azodiisobutyronitrile for reaction; cooling to room temperature, adding an alcoholic solution of sodium methoxide while stirring, and reacting in a closed state for at least 30 minutes; raising the temperature to 70-80 DEG C, adding the pre-irradiated ethylene-vinyl acetate copolymer emulsion and organic boric acid, starting air exhaust, and stirring for reaction; pre-stirring the cement, the sand, the additive and part of the water, slowly adding into the system obtained in the previous step, slowly stirring while adding the rest of the water, and quickly stirring after the rest of the water is completely added until all the components are uniformly distributed. The preparation of the polyvinyl alcohol modified cement paste is realized by a one-pot method, the operation is simple, and the product is low in consistency, good in fluidity and good in toughening and reinforcing effects.
本发明涉及建筑材料技术领域，具体公开了一种原位生成聚乙烯醇乳液改性水泥浆的制备方法，包括如下操作步骤：向反应釜中加入甲醇、醋酸乙烯酯和甲基丙烯酸羟乙酯，加热到60‑70℃并加入偶氮二异丁腈反应；降至室温后搅拌下加入甲醇钠的醇溶液，密闭反应至少30min；升温至70‑80℃并添加预辐照后的乙烯‑醋酸乙烯共聚乳液及有机硼酸，开启排风并搅拌反应；将水泥、砂、添加剂及部分水预搅拌后缓慢加入到上一步所得的体系中，边添加剩余部分的水、边缓慢搅拌，待剩余部分的水添加完毕后快速搅拌，直至各组分分布均匀。本发明一锅法实现了聚乙烯醇改性水泥浆的制备，操作简单且产物稠度低、流动性好，增韧、增强效果佳。
Preparation method for in-situ generation of polyvinyl alcohol emulsion modified cement paste
一种原位生成聚乙烯醇乳液改性水泥浆的制备方法
LIN CHANG (Autor:in) / HUANG YAN (Autor:in) / XU SHUYING (Autor:in) / PAN LISHA (Autor:in)
22.10.2024
Patent
Elektronische Ressource
Chinesisch
Properties of cement paste with admixture of polyvinyl acetate emulsion
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