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Anti-settling aid, and preparation method and application thereof

An anti-settling and additive technology, applied in the field of materials, can solve problems such as unfavorable dispersion of cement and mineral admixtures, low steric hindrance, and reduced viscosity of thickeners, achieving obvious anti-settling effect, lowering production costs, and reducing The effect of subsidence

Active Publication Date: 2020-02-21
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is applied to the wet-milled slag slurry, which can make the prepared wet-ground slag slurry almost have no settlement phenomenon, and the strength of the wet-ground slag slurry does not shrink in the later stage, but on the one hand, the dispersant used in the invention It is the molecular conformation of the traditional carboxylic acid graft copolymer, which is greatly affected by the salt concentration in high-salt systems such as cement and mineral admixtures. If the conformation is more curled up in cement and mineral admixture systems, Then the adsorption is relatively slow, and the steric hindrance provided is also relatively low, which is unfavorable for the dispersion of cement and mineral admixtures, which is a typical common polyelectrolyte behavior; on the other hand, the used thickener of this invention is Wenlun glue, Xanthan gum and konjac gum, such thickeners are incompatible with polycarboxylate superplasticizers, and the viscosity of such thickeners will decrease in high-salt systems such as cement and mineral admixtures

Method used

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  • Anti-settling aid, and preparation method and application thereof
  • Anti-settling aid, and preparation method and application thereof
  • Anti-settling aid, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of preparation of anti-sedimentation aid, comprises the following steps:

[0043] (1) Polymerization reaction

[0044] Access to N 2 Rinse the three-necked flask, then add a certain amount of deionized water, 0.1mol ethacryloyloxymethyldiethylamine and 0.0005mol hydroquinone, stir to dissolve, gradually raise the temperature to 65°C, stir at constant temperature for 10min, drop by drop Add a mixture of 0.1mol 1,4-butyl sultone and 15ml of acetone, dropwise for 2h, after the dropwise addition is completed, react at a constant temperature for 10h, then cool the reactant to terminate the reaction, filter and wash repeatedly ℃ vacuum drying to obtain the functional monomer ethacryloyloxymethyl diethylaminobutanesulfonate;

[0045] (2) Copolymerization reaction

[0046] First add a certain amount of 0.5mol / L sodium chloride solution to the polymerization bottle, then add 0.3mol acrylamide and 0.001mol ethacryloyloxymethyldiethylaminobutanesulfonate monosodium chlor...

Embodiment 2

[0051] The difference between this example and example 1 is: after the copolymerization reaction for 4 hours, acetone was used to terminate the reaction.

[0052] The effect of the anti-sedimentation additive prepared in this example on the anti-sedimentation of cement and mineral admixtures was tested when the amount of the anti-sedimentation additive prepared in this example was 1 wt% in the wet grinding concrete waste slurry. See Table 1 for specific results.

Embodiment 3

[0054] The difference between this example and example 1 is: after the copolymerization reaction for 12 hours, acetone was used to terminate the reaction.

[0055] The effect of the anti-sedimentation additive prepared in this example on the anti-sedimentation of cement and mineral admixtures was tested when the amount of the anti-sedimentation additive prepared in this example was 1 wt% in the wet grinding concrete waste slurry. See Table 1 for specific results.

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Abstract

The invention discloses an anti-settling aid, and a preparation method and application thereof. The preparation method comprises the following steps: generating a functional monomer B from sultone, afunctional monomer A and a small amount of polymerization inhibitor at a certain temperature; adding the obtained functional monomer B and neutral monomer acrylamide into a certain amount of sodium chloride solution, and carrying out a copolymerization reaction under the action of an initiator to obtain a zwitterionic copolymer; and carrying out co-heating on the zwitterionic copolymer and an aqueous cross-linking agent solution in a hydrochloric acid solution for a cross-linking reaction so as to obtain an amphoteric micro-cross-linked polymer. Based on reverse polyelectrolyte effect and micro-crosslinking effect, the amphoteric micro-crosslinked anti-settling aid applicable to wet-ground concrete waste slurry high-salt system is developed; and compared with the prior art, the amphotericmicro-crosslinked anti-settling aid has remarkable beneficial effects.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an anti-sedimentation additive and its preparation method and application. Background technique [0002] In recent years, with the country's large investment in infrastructure construction, various large and small commercial concrete mixing plants have been established all over the country. The commercial concrete industry has developed rapidly, but the sewage discharge situation of concrete mixing plants is still severe. According to relevant data, every 1000m produced 3 of concrete will yield 12m 3 Left and right concrete waste slurry, this quantity is huge. The waste slurry of the mixing station is generally a kind of liquid waste discharged from the washing transport vehicles, pump trucks, mixers and supporting equipment after the production of concrete. [0003] At present, most concrete production enterprises adopt the method of installing concrete separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/38C08J3/24C07C303/32C07C309/14C08L33/26
CPCC08F220/56C08J3/24C07C303/32C08J2333/26C07C309/14
Inventor 周博儒赵日煦王军张恒春熊龙李兴邢菊香包明余昆
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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