A kind of viscosity-reducing polycarboxylate water-reducing agent with micro-crosslinking structure and preparation method thereof
A viscous polycarboxylic acid and water reducing agent technology, applied in the field of concrete admixtures, can solve the problems of reducing the viscosity of concrete, increasing the thickness of the admixture adsorption layer on the surface of cement particles, etc., so as to reduce the viscosity, improve the polymerization efficiency and effective molecular structure. The effect of arrangement and viscosity reduction
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Embodiment 1
[0030] A micro-crosslinking viscosity-reducing polycarboxylate water-reducing agent, the mass percentage of the amount of the monomer components in the polymerization reaction: 6% of unsaturated carboxylic acid, 1.3% of unsaturated acid anhydride, 91% of prenol polyoxyethylene ether , 1.2% of cross-linking agent, 0.5% of reactive cosolvent, and the total is 100%. The preparation method steps are as follows:
[0031] S1. Weigh 202g of isoprenol polyoxyethylene ether monomer with a molecular weight of 2400 and 2.88g of maleic anhydride, dissolve in 205g of deionized water, heat up to 50°C and keep the temperature constant to obtain solution A.
[0032] S2. Weigh 13.3g of acrylic acid, 2.66g of N,N'-methylenebisacrylamide, 1.1g of hydroxyethyl acrylate and 0.38g of chain transfer agent mercaptoethanol, and dissolve them in 30g of water to obtain solution B.
[0033] S3, take by weighing 1.66g ammonium persulfate and 0.36g azodiisobutylamidine hydrochloride and dissolve in 30g wa...
Embodiment 2
[0039] A micro-crosslinking viscosity-reducing polycarboxylate water-reducing agent, the mass percentage of each monomer component in the polymerization reaction: 5.7% of unsaturated carboxylic acid, 2.4% of unsaturated acid anhydride, 90% of prenol polyoxyethylene ether , 1.4% of cross-linking agent, 0.5% of reactive cosolvent, and the total is 100%. The preparation method steps are as follows:
[0040] S1. Weigh 200 g of isoprenol polyoxyethylene ether monomer with a molecular weight of 2400 and 5.33 g of maleic anhydride, dissolve in 205 g of deionized water, heat up to 50° C. and maintain a constant temperature to obtain solution A.
[0041] S2. Weigh 12.65g acrylic acid, 3.1g N,N'-(1,2-dihydroxyethylene) bisacrylamide, 0.89g hydroxyethyl acrylate and 0.38g chain transfer agent mercaptoacetic acid, dissolve in 30g water to obtain mixed solution B;
[0042] S3, take by weighing 1.46g ammonium persulfate, 0.4g sodium persulfate and dissolve in 30g water to obtain mixed solu...
Embodiment 3
[0048] A micro-crosslinking viscosity-reducing polycarboxylate water-reducing agent, the mass percentages of the monomer components in the polymerization reaction: 5.7% of unsaturated carboxylic acid, 2.1% of unsaturated acid anhydride, 87.2% of prenol polyoxyethylene ether , 4.5% of cross-linking agent, 0.5% of reactive cosolvent, and the total is 100%. The preparation method steps are as follows:
[0049] S1. Weigh 193 g of isoprenol polyoxyethylene ether monomer with a molecular weight of 2400 and 3.33 g of maleic anhydride, dissolve in 205 g of deionized water, heat up to 50° C. and keep the temperature constant to obtain solution A.
[0050] S2. Weigh 12.65 g of fumaric acid, 10 g of diethylene glycol methacrylate phosphate, 0.89 g of hydroxypropyl methacrylate and 0.38 g of chain transfer agent mercaptopropionic acid, and dissolve in 30 g of water to obtain solution B.
[0051] S3. Weigh 1.48 g of potassium persulfate and 0.2 g of azobisisoheptonitrile and dissolve in 3...
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