Polycarboxylic acid water reducing agent phosphoric acid esterification monomer and preparation method thereof and polycarboxylic acid water reducing agent and preparation method thereof
A technology of water reducer and polycarboxylic acid, which is applied in the field of polycarboxylate water reducer and preparation, polycarboxylate water reducer phosphating monomer and preparation, can solve the problem of reducing concrete slump and fluidity Small size, concrete bleeding, poor adaptability and other problems, to achieve excellent adaptability, improve concrete workability, and reduce the sensitivity of dosage
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[0074] The preparation method of the phosphoric esterification monomer of the polycarboxylate water reducer of the present invention has simple process and is suitable for large-scale production.
[0075] The phosphorylated monomer of the polycarboxylate superplasticizer of the present invention may contain the following components:
[0076]
[0077] as P 2 o 5 The substances that may be produced by reacting with isopentenol polyoxyethylene ether (TPEG) are:
[0078] Monoesters and Diesters:
[0079]
[0080] Part P 2 o 5 Moisture absorption becomes metaphosphoric acid, and metaphosphoric acid reacts with TPEG to form phosphate monoester:
[0081]
[0082] Metaphosphoric acid reacts with water to generate pyrophosphoric acid, pyrophosphoric acid and TPEG generate pyrophosphate diester, and pyrophosphate diester is hydrolyzed to generate phosphoric acid monoester and phosphoric acid:
[0083]
[0084]
[0085] In addition to the above reaction products, som...
Embodiment 1
[0121] A kind of preparation method of polycarboxylate superplasticizer phosphating monomer, comprising:
[0122] raw material:
[0123] a. Isopentenol polyoxyethylene ether-2400 (the number indicates the weight average molecular weight, the same below);
[0124] B, phosphorus pentoxide (analytical pure);
[0125] c, sulfamic acid;
[0126] d, sodium hydroxide (using mass fraction is 40% sodium hydroxide aqueous solution).
[0127] Wherein the mol ratio of raw material a and b is 2:1;
[0128] Raw material c is 1.0% of the total mass of a and b;
[0129] Raw material d is 0.04% of the total mass of a and b.
[0130] The four-neck flask is equipped with a thermometer, a stirring and reflux device, and is protected by nitrogen. Put the TPEG-2400 monomer into a four-necked bottle, heat it to 50°C in a water bath to melt, and stir for 5 minutes. Add phosphorus pentoxide in batches at 30°C, each time not exceeding 10% of the total amount of phosphorus pentoxide, with an inte...
Embodiment 2
[0132] A kind of preparation method of polycarboxylate superplasticizer phosphating monomer, comprising:
[0133] raw material:
[0134] a. Isopentenol polyoxyethylene ether-2000;
[0135] B, phosphorus pentoxide (analytical pure);
[0136] c. 98% concentrated sulfuric acid;
[0137] d, sodium hydroxide (using mass fraction is 40% sodium hydroxide aqueous solution).
[0138] Wherein the mol ratio of raw material a and b is 2:1;
[0139] Raw material c is 0.5% of the total mass of a and b;
[0140] Raw material d is 1.0% of the total mass of a and b.
[0141] The four-neck flask is equipped with a thermometer, a stirring and reflux device, and is protected by nitrogen. Put the TPEG-2000 monomer into a four-necked bottle, heat it to 50°C in a water bath to melt, and stir for 5 minutes. Add phosphorus pentoxide in batches at 40°C, each time not exceeding 10% of the total amount of phosphorus pentoxide, with an interval of 10 minutes each time. Control the temperature not ...
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