Preparation method of super-retarding type polycarboxylate superplasticizer

A technology of retarded polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of affecting the use of products, increase production cost, low reactivity, etc., and achieve the effects of improving production efficiency, thorough reaction and good reactivity

Active Publication Date: 2014-06-11
KZJ NEW MATERIALS GROUP CO LTD
5 Cites 56 Cited by

AI-Extracted Technical Summary

Problems solved by technology

For example, CN102241489A discloses a super-retarding polycarboxylate water reducer and its preparation and use method. The super-retarding polycarboxylate water reducer is based on allyl polyethylene glycol (number average ), methyl acrylate, maleic anhydride, sodium lignosulfonate, and sucrose fatty acid esters are directly synthesized under the action of ammonium persulfate and neutralized by sodium hydroxide. The raw materials are cheap, but sodium lignosulfonate reacts The activity is low, and unreacted sodium lignosulfonate is easy to form precipitation, w...
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Abstract

The invention discloses a preparation method of a super-retarding type polycarboxylate superplasticizer. The super-retarding type polycarboxylate superplasticizer comprises a copolymer and water serving as a solvent, wherein the copolymer comprises an unsaturated polyether macromonomer, an unsaturated carboxylic acid/anhydride mini-monomer, an unsaturated sulfonic acid mini-monomer and an unsaturated phosphonic acid mini-monomer; the pH is 6-7. According to the preparation method, a phosphonate structure capable of retarding is introduced into a water reducer molecular structure; the prepared super-retarding type polycarboxylate superplasticizer can be directly applied to the concrete which needs a relatively long setting time, and thus the process of compounding a retarder can be saved, the production efficiency can be improved, the obtained product is uniform and stable, and abnormal concrete setting time can be avoided.

Technology Topic

SolventSetting time +7

Examples

  • Experimental program(6)

Example Embodiment

[0023] Example 1
[0024] (1) Copolymerization reaction: add 100.00g APEG (molecular weight 800-3000) and 136.00g water into the reactor, turn on the stirring, and gradually increase the temperature. When the stirring is uniform and the temperature rises to 60℃, start to add maleic anhydride, A mixed aqueous solution of sodium methacrylic acid, vinylphosphonic acid and thioglycolic acid (among which maleic anhydride 5.00g, sodium methacrylic acid 6.27g, vinylphosphonic acid 7.70g, thioglycolic acid 0.85g, water 15.00g) After reacting with an aqueous solution of ammonium persulfate (1.43g of ammonium persulfate and 30.00g of water) at 60°C for 3 hours, a copolymerized product was obtained.
[0025] (2) Neutralization reaction: adjust the pH to 6-7 with sodium hydroxide to obtain a super retarding polycarboxylic acid water reducer.

Example Embodiment

[0026] Example 2
[0027] (1) Copolymerization reaction: add 100.00g TPEG (molecular weight 800-3000) and 132.00g water into the reactor, turn on the stirring, gradually increase the temperature, when the stirring is uniform and the temperature rises to 55℃, start to add acrylic acid and vinyl respectively A mixed aqueous solution of sodium sulfonate, diethyl vinylphosphonate and mercaptopropionic acid (including 8.69 g of acrylic acid, 2.50 g of sodium vinyl sulfonate, 9.33 g of diethyl vinyl phosphonate, 0.98 g of mercaptopropionic acid, and water 15.00 g) After reacting with an aqueous solution of ammonium persulfate (1.37g of ammonium persulfate and 30.00g of water) at 60°C for 4 hours, a copolymerized product is obtained.
[0028] (2) Neutralization reaction: adjust the pH to 6-7 with sodium hydroxide to obtain a super retarding polycarboxylic acid water reducer.

Example Embodiment

[0029] Example 3
[0030] (1) Copolymerization reaction: add 50.00g HPEG (molecular weight 800-3000), 50.00g TPEG (molecular weight 800-3000) and 450.00g water into the reactor, turn on the stirring, gradually increase the temperature, wait until it is evenly stirred and the temperature rises to 65°C When, start to add acrylic acid, sodium styrene sulfonate, vinyl phosphonic acid, diethyl vinyl phosphonate, phosphonic acid-β-styryl ester and mercaptopropionic acid mixed aqueous solution (including acrylic acid 7.80g, ethylene Sodium sulfonate 6.50g, vinylphosphonic acid 2.92g, vinyl diethyl phosphonate 3.00g, phosphonic acid-β-styryl ester 2.08g, mercaptopropionic acid 1.11g, water 15.00g) and potassium persulfate The aqueous solution (including 0.83 g of potassium persulfate and 30.00 g of water) was reacted at 60°C for 5 hours to obtain a copolymer product.
[0031] (2) Neutralization reaction: adjust the pH to 6-7 with sodium hydroxide to obtain a super retarding polycarboxylic acid water reducer.

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