A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention belongs to the technical field of machine-made sand and preparation thereof, and particularly relates to machine-made sand and a preparation method thereof. The machine-made sand is prepared by the following steps: firstly, hydroxylating the surface of siliceous machine-made sand to obtain hydroxylated siliceous machine-made sand, then modifying the hydroxylated siliceous machine-made sand with a coupling agent to obtain coupling agent modified siliceous machine-made sand, and carrying out graft polymerization on the coupling agent modified machine-made sand, carboxyl and peptide bonds through graft polymerization to obtain the amphoteric surface activity modified siliceous machine-made sand with positive and negative charges. According to the method, the coupling agent modified siliceous machine-made sand is put into a three-neck flask, reduced pressure distillation is directly carried out, then continuous water washing is carried out, the PH value is neutralized to 7.0+/-0.2 with alkali liquor, amphoteric surface activity modified siliceous machine-made sand with positive and negative charges is formed, even silicon-oxygen broken bonds are obtained, the surface of the machine-made sand can carry positive and negative charges, static electricity is generated, the machine-made can be effectively adsorbed on the surfaces of particles, and concrete has good workability by means of the dispersion effect and the adsorption complexation effect.
本发明属于机制砂及其制备技术领域，特别涉及一种机制砂及其制备方法。一种机制砂，首先对硅质机制砂的表面进行羟基化处理得到羟基化硅质机制砂，随后通过偶联剂改性羟基化硅质机制砂得到偶联剂改性硅质机制砂，再通过接枝聚合反应使偶联剂改性机制砂与羧基和肽键接枝聚合得到带有正负电荷的两性表面活性改性硅质机制砂。本发明通过偶联剂改性硅质机制砂在放入三口烧瓶中，直接进行减压蒸馏，然后不断水洗，用碱液中和PH到7.0±0.2，形成带有正负电荷的两性表面活性改性硅质机制砂，即使得硅氧断键，能够使得机制砂的表面能够带有正负电荷，产生了静电，可以有效吸附在颗粒表面，依靠分散作用和吸附络合作用使得混凝土具有良好的和易性。
The invention belongs to the technical field of machine-made sand and preparation thereof, and particularly relates to machine-made sand and a preparation method thereof. The machine-made sand is prepared by the following steps: firstly, hydroxylating the surface of siliceous machine-made sand to obtain hydroxylated siliceous machine-made sand, then modifying the hydroxylated siliceous machine-made sand with a coupling agent to obtain coupling agent modified siliceous machine-made sand, and carrying out graft polymerization on the coupling agent modified machine-made sand, carboxyl and peptide bonds through graft polymerization to obtain the amphoteric surface activity modified siliceous machine-made sand with positive and negative charges. According to the method, the coupling agent modified siliceous machine-made sand is put into a three-neck flask, reduced pressure distillation is directly carried out, then continuous water washing is carried out, the PH value is neutralized to 7.0+/-0.2 with alkali liquor, amphoteric surface activity modified siliceous machine-made sand with positive and negative charges is formed, even silicon-oxygen broken bonds are obtained, the surface of the machine-made sand can carry positive and negative charges, static electricity is generated, the machine-made can be effectively adsorbed on the surfaces of particles, and concrete has good workability by means of the dispersion effect and the adsorption complexation effect.
本发明属于机制砂及其制备技术领域，特别涉及一种机制砂及其制备方法。一种机制砂，首先对硅质机制砂的表面进行羟基化处理得到羟基化硅质机制砂，随后通过偶联剂改性羟基化硅质机制砂得到偶联剂改性硅质机制砂，再通过接枝聚合反应使偶联剂改性机制砂与羧基和肽键接枝聚合得到带有正负电荷的两性表面活性改性硅质机制砂。本发明通过偶联剂改性硅质机制砂在放入三口烧瓶中，直接进行减压蒸馏，然后不断水洗，用碱液中和PH到7.0±0.2，形成带有正负电荷的两性表面活性改性硅质机制砂，即使得硅氧断键，能够使得机制砂的表面能够带有正负电荷，产生了静电，可以有效吸附在颗粒表面，依靠分散作用和吸附络合作用使得混凝土具有良好的和易性。
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