Method for preparing crystal nucleus early-strength polycarboxylate superplasticizer with long-term dispersity

A technology of strong polycarboxylic acid and water-reducing agent, applied in the field of water-reducing agent, can solve problems such as poor water-reducing effect, and achieve the effects of not easy to disperse, increase specific surface area, and improve reaction rate

Active Publication Date: 2022-06-24
江苏博拓新型建筑材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ammonium alkoxide modified calcium silicate hydrate nano crystal nucleus early strength agent has simple process,

Method used

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  • Method for preparing crystal nucleus early-strength polycarboxylate superplasticizer with long-term dispersity
  • Method for preparing crystal nucleus early-strength polycarboxylate superplasticizer with long-term dispersity
  • Method for preparing crystal nucleus early-strength polycarboxylate superplasticizer with long-term dispersity

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1

[0049] The method for preparing crystal nucleus early-strength polycarboxylate water-reducing agent in this embodiment comprises the following steps:

[0050] (1) take by weighing 23.0g (0.18mol) calcium formate, 77g distilled water and be placed in the beaker of 300ml, stir and dissolve completely under the action of magnetic stirrer, promptly be mixed with molar concentration and be the calcium formate aqueous solution of 2.3mol / L for subsequent use;

[0051] (2) Weigh 50g (0.18mol) of sodium metasilicate nonahydrate and 100g of water and place them in a 300ml beaker, stir and dissolve completely under the action of a magnetic stirrer, namely, be prepared into a sodium silicate with a molar concentration of 1.8mol / L Aqueous solution for standby;

[0052] (3) 13.46g of polyether macromonomer alkylene polyoxyethylene ether and 7.7g of water were placed in a 50mL beaker, heated and dissolved on a magnetic stirrer to obtain mixed solution 1; 0.065g of mercaptop...

Example Embodiment

[0055] Example 2

[0056] The method for preparing crystal nucleus early-strength polycarboxylate water-reducing agent in this embodiment comprises the following steps:

[0057] (1) take by weighing 34.5g (0.26mol) calcium formate, 90.5g distilled water and place in the beaker of 300ml, stir and dissolve completely under the action of magnetic stirrer, promptly be mixed with molar concentration and be the calcium formate aqueous solution of 2.9mol / L for subsequent use;

[0058] (2) Weigh 75g (0.26mol) of sodium metasilicate nonahydrate and 100g of water and place them in a beaker of 300ml, stir and dissolve completely under the action of a magnetic stirrer, that is, prepare a sodium silicate with a molar concentration of 2.6mol / L Aqueous solution for standby;

[0059] (3) 11.22g of polyether macromonomer methylalkenyl polyoxyethylene ether (OXAB-608) and 6.4g of water were charged into a 50mL beaker, and heated and dissolved on a magnetic stirrer to obtain a mixed solution 1;...

Example Embodiment

[0062] Example 3

[0063] The method for preparing crystal nucleus early-strength polycarboxylate water-reducing agent in this embodiment comprises the following steps:

[0064] (1) take by weighing 11.5g (0.09mol) calcium formate, 68.5g distilled water and place in the beaker of 300ml, stir and dissolve completely under the action of magnetic stirrer, promptly be mixed with molar concentration and be the calcium formate aqueous solution of 1.3mol / L for subsequent use;

[0065] (2) Weigh 25g (0.09mol) of sodium metasilicate nonahydrate and 100g of water and place them in a beaker of 300ml, stir and dissolve completely under the action of a magnetic stirrer, that is, prepare a sodium silicate with a molar concentration of 0.9mol / L Aqueous solution for standby;

[0066] (3) 15.7g of polyether macromonomer OXAB-608 and 8.97g of water were placed in a 50mL beaker, heated and dissolved on a magnetic stirrer to obtain mixed solution 1; 0.076g of mercaptopropionic acid, 0.031g of VC...

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Abstract

The invention discloses a method for preparing a crystal nucleus early-strength polycarboxylate superplasticizer with long-term dispersibility, which comprises the following steps: preparing a polycarboxylate superplasticizer into a reaction base solution, respectively preparing a calcium source aqueous solution microemulsion and a silicon source aqueous solution microemulsion, simultaneously dropwise adding the calcium source aqueous solution microemulsion and the silicon source aqueous solution microemulsion into the reaction base solution, carrying out heat preservation reaction, and carrying out vacuum drying to obtain the polycarboxylate superplasticizer with long-term dispersibility. The crystal nucleus early-strength polycarboxylic acid water reducing agent is prepared. The nanometer crystal nucleus early strength polycarboxylic acid water reducer is prepared by adopting a microemulsion method, polycarboxylic acid macromolecules are intercalated into silica tetrahedral structures of silicate crystals, a hydrated gel network structure is generated through reaction, the network structure enables steric hindrance in crystal nucleuses to be increased, calcium silicate crystal nucleus particles are not prone to aggregation, the crystal nucleus particles are relatively stable, and the early strength polycarboxylic acid water reducer has the advantages that the early strength polycarboxylic acid water reducer is high in water-retaining property; therefore, the long-term stability of the crystal nucleus suspension is improved, the reaction rate of the dispersing agent is improved, the specific surface area of the nano crystal nucleus is increased, the cement hydration rate is increased, and the early strength of concrete is greatly improved.

Description

technical field [0001] The invention belongs to the field of water-reducing agents, in particular to a method for preparing a crystal nucleus early-strength polycarboxylate water-reducing agent with long-term dispersibility. Background technique [0002] At present, prefabricated buildings with high efficiency, good quality, easy installation, energy saving and environmental protection are being widely used, and higher requirements are also put forward when producing prefabricated components, shortening the demoulding cycle of prefabricated components, and improving the efficiency through steam curing technology. The early strength of prefabricated components is to achieve the purpose of saving energy and reducing consumption, so it has become an inevitable trend to develop a new type of early strength agent. [0003] In order to solve the above problems, using polycarboxylate superplasticizer as dispersant, artificially synthesize a kind of nano-scale calcium silicate hydra...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/16C08F283/06C08F220/06C08F220/58C04B103/30
CPCC04B24/425C04B24/165C08F283/065C04B2103/302C08F220/06C08F220/585Y02W30/91
Inventor 倪荣凤陈迪罗乃将羊中军刘启明沈卫国
Owner 江苏博拓新型建筑材料股份有限公司
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