Covalent bond type alkali-free accelerator and preparation method thereof

A technology of covalent bond and accelerator, which is applied in the field of covalent bond type non-alkali accelerator and its preparation, and can solve the problems of short service life of non-alkali accelerator

Active Publication Date: 2020-07-07
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of the existing non-alkali quick-setting agent such as short service life, the invention provides a covalent bond type non-alkali quick-setting agent and its preparation method

Method used

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  • Covalent bond type alkali-free accelerator and preparation method thereof
  • Covalent bond type alkali-free accelerator and preparation method thereof
  • Covalent bond type alkali-free accelerator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of covalent bond type non-alkali quick-setting agent comprises the following steps:

[0029] (1) Add 4g of 200-300 mesh polyaluminum sulfate and 1g of nanometer γ-alumina to 90g of 95wt% ethanol aqueous solution, and then ultrasonically disperse for 1h to obtain a uniformly dispersed suspension; then add 5g of 1wt% completely hydrolyzed γ-methacryloxypropyltrimethoxysilane ethanol solution; under the protection of nitrogen, stirred and reacted at 80°C for 24h, then centrifuged, washed with ethanol for 3 times, and finally dried in vacuum at 60°C to obtain the inorganic compound Point A.

[0030] (2) Mix 20 g of dimethyl diallyl ammonium chloride, 25 g of acrylic acid and 54.8 g of water uniformly, then add 0.2 g of ammonium persulfate and mix uniformly to obtain organic component B.

[0031] (3) Mix 40g of inorganic component A, 5g of diethanolamine, 3g of oxalic acid and 39.75g of water evenly, heat to 60°C, then add 12g of organic component B and 0.25...

Embodiment 2

[0033] The preparation of covalent bond type non-alkali quick-setting agent comprises the following steps:

[0034] (1) Add 4.9g of 200-300mesh polyaluminum sulfate and 0.1g of nanometer γ-alumina to 91g of 95wt% ethanol aqueous solution, and then ultrasonically disperse for 1 hour to obtain a uniformly dispersed suspension; then add 4g of 3wt% completely Hydrolyzed γ-methacryloxypropyltrimethoxysilane ethanol solution; under the protection of nitrogen, stirred and reacted at 80°C for 24h, then centrifuged, washed with ethanol for 3 times, and finally dried in vacuum at 60°C to obtain Unit A.

[0035] (2) Mix 25g dimethyl diallyl ammonium chloride, 20g acrylic acid and 53.8g water uniformly, then add 1.2g sodium persulfate and mix uniformly to obtain organic component B.

[0036] (3) Mix 50g of inorganic component A, 10g of triethanolamine, 1g of lactic acid and 23.65g of water evenly, heat to 80°C, then add 15g of organic component B and 0.35g of catechol respectively, keep ...

Embodiment 3

[0038] The preparation of covalent bond type non-alkali quick-setting agent comprises the following steps:

[0039] (1) Add 4g of 200-300 mesh polyaluminum sulfate and 1g of nanometer γ-alumina to 90.5g of 95wt% ethanol aqueous solution, and then ultrasonically disperse for 1 hour to obtain a uniformly dispersed suspension; then add 4.5g of 2wt% completely Hydrolyzed γ-methacryloxypropyltrimethoxysilane ethanol solution; under the protection of nitrogen, stirred and reacted at 80°C for 24h, then centrifuged, washed with ethanol for 3 times, and finally dried in vacuum at 60°C to obtain Unit A.

[0040] (2) Mix 22g of dimethyl diallyl ammonium chloride, 23g of acrylic acid and 54g of water uniformly, then add 1g of potassium persulfate and mix uniformly to obtain organic component B.

[0041] (3) Mix 50g of inorganic component A, 10g of triethanolamine, 1g of lactic acid and 23.65g of water evenly, heat to 80°C, then add 15g of organic component B and 0.35g of catechol respect...

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Abstract

The invention discloses a covalent bond type alkali-free accelerator and a preparation method thereof. The alkali-free setting accelerator is prepared from the following components in percentage by mass: 40-50% of an inorganic component A, 5 to 10 percent of alkylol amine, 1 to 3 percent of organic acid, 12 to 15 percent of organic component B, 0.25 to 0.35 percent of catechol and the balance of water; wherein the inorganic component A is prepared from the following components in percentage by weight: 200 to 300 meshes of polyaluminum sulfate, nano gamma-aluminum oxide, a silane coupling agentsolution and 95 weight percent of ethanol water, and the organic component B is prepared from dimethyl diallyl ammonium chloride, acrylic acid and initiator water in proportion. The alkali-free setting accelerator is long in service life and good in construction performance; the introduced organic component has higher charge density and proper molecular weight, and can be bonded and precipitatedwith calcium ions in cement, thereby promoting gypsum consumption, enhancing the hydration rate of C3A and shortening the coagulation time of the product.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a covalent bond type alkali-free accelerator and a preparation method thereof. Background technique [0002] Accelerator is a concrete admixture that makes cement or concrete set and harden quickly. Its main function is to increase the thickness of the first spraying of shotcrete, shorten the interval between the second spraying, and improve the early strength of concrete at the same time, so as to provide support resistance in time. It has been widely used in modern underground engineering, mining engineering, plugging and emergency rescue Wait for the project. [0003] Alkali-free accelerators have little effect on the strength of concrete in the later stage, and are becoming the main direction of accelerator development. Alkali-free accelerators with aluminum sulfate as the main component are easy to obtain raw materials and simple preparation processes. The main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B103/12
CPCC04B40/0046C04B2103/12C04B22/148C04B22/06C04B24/42C04B24/026C04B24/122C04B24/06C04B24/2652C04B24/02
Inventor 洪锦祥张小磊王伟乔敏赵爽曾鲁平
Owner JIANGSU SOBUTE NEW MATERIALS
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