Super-early-strength PCE (polycarboxylate ether) superplasticizer and preparation method thereof

A technology of early-strength polycarboxylate and strong polycarboxylate, which is applied in the field of super-early-strength polycarboxylate water reducer and its preparation, can solve the problem of large concrete slump loss, poor mud resistance, and inability to meet concrete construction performance, etc. problems, to achieve the effect of improving water reduction rate, reducing adsorption, and accelerating water and chemistry

Active Publication Date: 2015-12-30
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity and diversity of concrete raw materials in my country, especially when the soil content of sand and gravel is large, the slump loss of concrete is large. The polycarboxylate water reducer produced by TPEG, due to the connection between the PEG side chain and the soil Intercalation reaction makes it poor in mud resistance and cannot meet the requirements of concrete construction performance

Method used

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  • Super-early-strength PCE (polycarboxylate ether) superplasticizer and preparation method thereof
  • Super-early-strength PCE (polycarboxylate ether) superplasticizer and preparation method thereof
  • Super-early-strength PCE (polycarboxylate ether) superplasticizer and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0050] A kind of embodiment of the preparation method of active macromonomer described in the present invention:

[0051] 1), the synthesis of active intermediates

[0052] Inject 5 mol of prenyl alcohol, 5 g of sodium hydride, 25 mol of ethylene oxide, and 5 mol of epichlorohydrin into a closed autoclave, stir, and react at 80° C. for 10 h to obtain the active intermediate of the reaction product.

[0053] 2) Synthesis of active macromers

[0054] Add 1 mol of triethylamine and 0.001 mol of hydroquinone into the flask, raise the temperature to 10°C, slowly add dropwise the triethylamine solution containing 5 mol of the active intermediate synthesized in step (1), after the dropwise addition, at 10°C Next, continue the incubation reaction for 10h to obtain the active macromonomer.

Embodiment 2

[0056] A kind of embodiment of the preparation method of cationic quaternary ammonium salt PEO active macromer of the present invention:

[0057] 1), the synthesis of active intermediates

[0058] Inject 5 mol of isobutenyl alcohol, 20 g of sodium hydride, 500 mol of ethylene oxide, 250 mol of propylene oxide, and 750 mol of epibromohydrin into a closed autoclave, stir, and react at 150°C for 2 hours to obtain the active intermediate of the reaction product.

[0059] 2) Synthesis of active macromers

[0060] Add 3 mol of trimethylamine and 0.004 mol of hydroquinone into the flask, raise the temperature to 30°C, slowly add dropwise the trimethylamine solution containing 5 mol of the active intermediate synthesized in step (1), after the dropwise addition, at 30°C, Continue the insulation reaction for 10h to obtain the active macromonomer.

Embodiment 3

[0062] A kind of embodiment of the preparation method of active macromonomer described in the present invention:

[0063] 1), the synthesis of active intermediates

[0064] Inject 5 mol allyl alcohol, 10 g sodium hydride, 1000 mol ethylene oxide, and 400 mol epoxy iodopropane into a closed autoclave, stir, and react at 100°C for 6 hours to obtain the active intermediate of the reaction product.

[0065] 2) Synthesis of active macromers

[0066] Add 5 mol of tripropylamine and 0.0015 mol of hydroquinone into the flask, heat up to 50°C, slowly add dropwise the tripropylamine solution containing 5mol of the active intermediate synthesized in step (1), after the dropwise addition, at 50°C, Continue the heat preservation reaction for 8h to obtain the active macromonomer.

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Abstract

The invention provides a super-early-strength PCE (polycarboxylate ether) superplasticizer. The super-early-strength PCE superplasticizer is a compound shown in formula (I) and is synthesized with active macro-monomers used as raw materials, the space hindrance effect of the superplasticizer is further improved, and meanwhile, positive ions with good cement resistance are introduced in molecules, so that the superplasticizing rate, the cement resistance and the cement adaptability of the superplasticizer are increased. The superplasticizer has better tolerance and cannot have a continuous intercalation reaction with the cement. The positive ions of the super-early-strength PCE superplasticizer can inhibit expansion of the cement so as to reduce adsorption of the cement to an additive. The super-early-strength PCE superplasticizer can accelerate the hydration function of the cement and has the super-early-strength function. The super-early-strength PCE superplasticizer has super-early-strength and cement-resistant functions in common concrete.

Description

technical field [0001] The invention relates to a water reducer, in particular to a super early strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, the research and production of concrete admixtures have tended to develop in the direction of high performance and no pollution. Concrete water reducer is the most widely used and most used concrete admixture. Water reducing agent mixed into fresh concrete can destroy the flocculation structure of cement particles, play a role in dispersing cement particles and cement hydration particles, thereby releasing free water in the flocculation structure and increasing the fluidity of concrete mixture . PCEs superplasticizers are anionic surfactants, which are mixed into cement paste, adsorbed on the surface of cement particles with cations, and dissociate into organic anion groups with hydrophilic and lipophilic effects. [0003] The molecular skeleton of the superpla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/14C08F220/06C08F216/20C08F228/02C04B24/26C04B103/30
Inventor 张小富赵利华白淑英
Owner GUANGDONG REDWALL NEW MATERIALS
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