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Concrete slump-retaining agent preparation process
The present invention discloses a concrete slump-retaining agent preparation process, which comprises: in a reaction kettle provided with a condensation reflux device, adding a hydroxyl-terminated polyoxyethylene ether, heating to melt, adding a catalyst and maleic anhydride, carrying out a solvent-free esterification reaction, carrying out an initiation copolymerization reaction on the obtained esterified macromonomer and a small monomer, and carrying out neutralization and concentration adjusting on the copolymer so as to obtain the slump-retaining agent, wherein the small monomer is one or a plurality of materials selected from styrene, acrylic acid, maleic anhydride, and olefine sulfonate. The preparation process of the present invention has the following advantages that: 1, based on the slump-retaining agent synthesis technology, a plurality of the dominant functional groups are subjected to graft copolymerization so as to optimize the slump retaining function and improve the compatibility with the soluble sulfate; 2, the molecular design concept is adopted, such that the steric hindrance and the electrostatic interaction coexist, and the retarding and the slow-releasing are concurrently considered; 3, the slump-retaining agent of the present invention and the condensation polymerization type water reducing agent are subjected to compounding use so as to provide a superimposed effect; and 4, the technical route adopts the two-step synthesis process.
Concrete slump-retaining agent preparation process
The present invention discloses a concrete slump-retaining agent preparation process, which comprises: in a reaction kettle provided with a condensation reflux device, adding a hydroxyl-terminated polyoxyethylene ether, heating to melt, adding a catalyst and maleic anhydride, carrying out a solvent-free esterification reaction, carrying out an initiation copolymerization reaction on the obtained esterified macromonomer and a small monomer, and carrying out neutralization and concentration adjusting on the copolymer so as to obtain the slump-retaining agent, wherein the small monomer is one or a plurality of materials selected from styrene, acrylic acid, maleic anhydride, and olefine sulfonate. The preparation process of the present invention has the following advantages that: 1, based on the slump-retaining agent synthesis technology, a plurality of the dominant functional groups are subjected to graft copolymerization so as to optimize the slump retaining function and improve the compatibility with the soluble sulfate; 2, the molecular design concept is adopted, such that the steric hindrance and the electrostatic interaction coexist, and the retarding and the slow-releasing are concurrently considered; 3, the slump-retaining agent of the present invention and the condensation polymerization type water reducing agent are subjected to compounding use so as to provide a superimposed effect; and 4, the technical route adopts the two-step synthesis process.
Concrete slump-retaining agent preparation process
FANG ZHIRONG (author) / DONG GUANG AN (author) / LIU JUN (author)
2015-07-08
Patent
Electronic Resource
English
IPC:
C08F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
C08G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, anders erhalten als durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
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