Solid polycarboxylate superplasticizer and preparation method thereof
A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixture, can solve the problems of poor product adaptability and complicated preparation process, achieve excellent performance, broad application prospects, and weaken the effect of intercalation adsorption
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Embodiment 1
[0038] This example provides a solid polycarboxylate water reducer, including the following raw material components in parts by mass: 75 parts of allyl polyoxyethylene ether with a weight average molecular weight of 1500, 16.2 parts of acrylic acid, 0.45 parts of ammonium persulfate, 0.1 part of sodium bisulfite, 0.45 part of azobisisobutyronitrile, 0.1 part of chain transfer agent mercaptopropionic acid, 1.69 part of 1-naphthyl isocyanate and 0.02 part of catalyst dibutyltin dilaurate.
[0039]The preparation steps of the above-mentioned solid polycarboxylate water-reducer are as follows: (1) Put the above-mentioned allyl polyoxyethylene ether into the reaction kettle (the reaction kettle is a 500mL four-necked flask), heat up to 50°C and start stirring, Allyl polyoxyethylene ether is completely melted; (2) in the dropping tank, 16.2 parts of acrylic acid and 0.1 part of mercaptopropionic acid are fully stirred to obtain the dropping liquid; After the allyl polyoxyethylene et...
Embodiment 2
[0041] This example provides a solid polycarboxylate water reducer, including the following raw material components in parts by mass: 90 parts of prenol polyoxyethylene ether with a weight average molecular weight of 1800, 17.6 parts of acrylic acid, and the initiator azobis 0.72 parts of isoheptanonitrile, 0.6 parts of chain transfer agent mercaptopropionic acid, 5.96 parts of phenyl isocyanate and 0.06 parts of stannous octoate.
[0042] The preparation steps of the above-mentioned solid polycarboxylate water-reducer are as follows: (1) Put the above-mentioned isopentenol polyoxyethylene ether into the reaction kettle (the reaction kettle is a 500mL four-necked flask), heat up to 55°C and start stirring , so that prenol polyoxyethylene ether is completely melted; (2) in the dropping tank, 17.6 parts of acrylic acid and 0.6 part of mercaptopropionic acid are fully stirred to obtain the dropping solution; (3) to be reacted in step (1) After the isopentenol polyoxyethylene ethe...
Embodiment 3
[0044] This example provides a solid polycarboxylate water reducer, including the following raw material components in parts by mass: 60 parts of methallyl polyoxyethylene ether with a weight average molecular weight of 2400, methyl polyoxyethylene ether with a weight average molecular weight of 1800 Allyl polyoxyethylene-propylene ether 45 parts, methacrylic acid 21.42 parts, sodium persulfate 0.84 parts, sodium bisulfite 0.2 parts, azoisobutylcyanoformamide 1.08 parts, chain transfer agent thioglycolic acid 0.76 parts, 7.81 parts of 4-biphenyl isocyanate, 0.03 parts of catalyst dialkyltin dimaleate, and 0.02 parts of catalyst dialkyltin dithiolate.
[0045] The preparation steps of the above-mentioned solid polycarboxylate water-reducer are as follows: (1) Put the above-mentioned methallyl polyoxyethylene ether and methallyl polyoxyethylene-propylene ether into the reactor (the reactor is a 500mL four (2) In the dropping flask, heat up to 60°C and start stirring, so that the...
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