A kind of preparation method of polycarboxylate superplasticizer
A high-efficiency water-reducing agent and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of long reaction period, low control precision and high reaction temperature, and achieve the effects of short reaction period, high purity and high quality
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Embodiment 1
[0030] A kind of preparation method of polycarboxylate superplasticizer, it comprises following preparation steps:
[0031] Step 1. Preparation of base liquid: Add 160 parts of methallyl alcohol polyoxyethylene ether and 190 parts of water into the reactor according to the mass fraction ratio, maintain the temperature at 25°C, stir for 25 minutes and then add 0.75 parts of ammonium persulfate. After stirring for 4 minutes, add 15 parts of acrylic acid and 10 parts of water at the same time, and form the base liquid after stirring for 8 minutes;
[0032] Step 2, preparation of auxiliary liquid: add 0.6 part of ascorbic acid and 0.75 part of thioglycolic acid into another reactor, and form auxiliary liquid after stirring for 4 minutes;
[0033] Step 3, blending and synthesis: drop the base liquid and auxiliary liquid into the reaction kettle at the same time, stir for 1 hour, add sodium hydroxide, adjust the pH value to 7, and obtain a polycarboxylic acid superplasticizer; the b...
Embodiment 2
[0035] Step 1. Preparation of base liquid: add 120 parts of macromolecular unsaturated monomer and 150 parts of water into the reactor according to the mass fraction ratio, maintain the temperature at 20°C, stir for 20 minutes, add 0.1 part of potassium persulfate, and stir for 3 minutes Finally, add 10 parts of unsaturated carboxylic acid and 8 parts of water at the same time, and stir for 6 minutes to form a base liquid; the unsaturated monomers are methallyl alcohol polyoxyethylene ether, polyalkylene glycol allyl ether, methoxy One or more of polyethylenyl allyl ether, isopentenol polyoxyethylene ether, polyethylene glycol acrylate, and methoxy polyethylene glycol acrylate; the unsaturated hydroxy acid is acrylic acid Or one or more of methacrylic acid;
[0036] Step 2, preparation of auxiliary liquid: add 0.1 part of reducing agent and 0.1 part of chain transfer agent in another reactor, and form auxiliary liquid after stirring for 3 minutes; The one of; described reduci...
Embodiment 3
[0039] Step 1. Preparation of base liquid: add 200 parts of macromolecular unsaturated monomer and 230 parts of water into the reactor according to the mass fraction ratio, maintain the temperature at 30°C, stir for 30 minutes, add 1.5 parts of hydrogen peroxide, and stir for 5 minutes Finally, add 20 parts of unsaturated carboxylic acid and 12 parts of water at the same time, and form base liquid after stirring for 10 minutes; the unsaturated monomer is methallyl alcohol polyoxyethylene ether, polyalkylene glycol allyl ether, methoxy One or more of polyethylenyl allyl ether, isopentenol polyoxyethylene ether, polyethylene glycol acrylate, and methoxy polyethylene glycol acrylate; the unsaturated hydroxy acid is acrylic acid Or one or more of methacrylic acid;
[0040] Step 2, preparation of auxiliary liquid: add 1 part of diaobai and 1 part of chain transfer agent to another reactor, and form auxiliary liquid after stirring for 5 minutes; the chain transfer agent is isopropan...
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