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Preparation method of organic-inorganic composite concrete retarder

An inorganic composite and retarder technology, applied in the field of retarders, can solve the problems of poor retarding effect and restraining the application range of concrete retarders, etc.

Inactive Publication Date: 2018-10-02
芜湖恒固混凝土材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing concrete retarders can only be used at normal temperature, and in hot summer, the retarding effect is very poor, which limits the application range of concrete retarders to a certain extent.

Method used

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  • Preparation method of organic-inorganic composite concrete retarder
  • Preparation method of organic-inorganic composite concrete retarder

Examples

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preparation example Construction

[0022] The present invention also provides a kind of preparation method of organic-inorganic composite concrete retarder, comprises the following steps:

[0023] (1) Calcining bentonite at 300-450°C for 2-4 hours, then milling the calcined bentonite and hydroxyethylidene diphosphonic acid in a ball mill, then adding water and maleic anhydride, and then heating at 80-95°C Ultrasonic reaction for 5-10 hours to obtain modified bentonite;

[0024] (2) After mixing polyether polyol, acid anhydride with 4-8 carbon atoms and organic amine in water, react at 80-120°C for 2-4 hours to obtain polymer emulsion A, and add phosphoric acid to polymer emulsion A Salt retarder, catalyst and formaldehyde are reacted at 80-120°C for 1-4 hours to obtain a retarder intermediate;

[0025] (3) After adding unsaturated glyceride, sodium borate, calcium sulfate, dispersant, surfactant, and modified bentonite to the retarder intermediate and mixing evenly, adjust the concentration of the product obta...

Embodiment 1

[0030] An organic-inorganic composite concrete retarder, made of the following raw materials in parts by weight: 30kg glycidyl methacrylate, 10kg sodium dipolyphosphate, 2kg hydroxyethylidene diphosphonic acid, 5kg bentonite, ethylenediaminetetra Disodium acetate 4kg, polyether 30503kg, 6kg maleic anhydride, 3kg ethylenediamine, 3kg hydrochloric acid (32wt%), 1kg formaldehyde, 3kg sodium borate, 6kg calcium sulfate, 2kg lignosulfonate sodium, 0.8kg organosilicon surface active Agent (purchased from Hangzhou Pinying New Material Co., Ltd., PY402).

[0031] The preparation steps of described organic-inorganic composite concrete retarder are as follows:

[0032] (1) Calcining bentonite at 350°C for 2h, then milling the calcined bentonite and hydroxyethylidene diphosphonic acid in a ball mill, then adding water and maleic anhydride, and then ultrasonically reacting at 90°C for 6h to obtain Modified bentonite;

[0033] (2) After mixing polyether 3050, maleic anhydride and ethylen...

Embodiment 2

[0036]An organic-inorganic composite concrete retarder, made of the following raw materials in parts by weight: 35kg glycidyl methacrylate, 8kg dibutyl phosphate, 4kg hydroxyethylidene diphosphonic acid, 10kg bentonite, 5kg ethylenediamine Disodium tetraacetate, 5kg polyether 3050, 8kg maleic anhydride, 6kg pentaethylene hexamine, 3kg hydrochloric acid (32wt%), 2kg formaldehyde, 4kg sodium borate, 8kg calcium sulfate, 3kg sodium lignosulfonate, 0.5kg organic silicon Surfactant (purchased from Hangzhou Pinying New Material Co., Ltd., PY402).

[0037] The preparation steps of described organic-inorganic composite concrete retarder are as follows:

[0038] (1) Calcining bentonite at 350°C for 3 hours, then milling the calcined bentonite and hydroxyethylidene diphosphonic acid in a ball mill, then adding water and maleic anhydride, and then ultrasonically reacting at 90°C for 8 hours to obtain Modified bentonite;

[0039] (2) After mixing polyether 3050, maleic anhydride and pen...

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Abstract

The invention relates to the technical field of concrete and preparation thereof, in particular to a preparation method of an organic-inorganic composite concrete retarder. The preparation method comprises the following steps: (1), calcinating bentonite, and then modifying by using hydroxyethylidene diphosphonic acid and maleic anhydride to obtain modified bentonite; (2), performing a reaction onpolyether polyol, acid anhydride and organic amine in water to obtain a polymer emulsion A, and then modifying the polymer emulsion by using a phosphate retarder, a catalyst and formaldehyde to obtaina retarder intermediate; (3), adding unsaturated glyceride, sodium borate, calcium sulfate, a dispersant, a surfactant and the modified bentonite into the retarder intermediate, and uniformly mixingto obtain the organic-inorganic composite concrete retarder. The organic-inorganic composite concrete retarder prepared by the preparation method provided by the invention can achieve a concrete retarding effect at 10-45 DEG C and has a wide applicable temperature range.

Description

technical field [0001] The invention relates to the technical field of retarders, in particular to a preparation method of an organic-inorganic composite concrete retarder. Background technique [0002] With the continuous development of construction technology, concrete with various special requirements emerges as the times require. In some large-scale concrete projects, in order to ensure that the bored piles in the subsequent construction and the bored piles completed in the previous construction are interlocked into a whole, it is often required to extend the setting time of the concrete to 60-80 hours, but it cannot affect the concrete. ultimate strength. Obviously, ordinary retarders cannot meet this requirement. The market share of this kind of ultra-retarding concrete is gradually increasing. In today's shrinking civil construction market, research on concrete super-retarding agents has very realistic economic and technical values. [0003] At present, the retarde...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/32C08G65/332C08G65/333C04B103/22
CPCC04B40/0039C04B24/32C04B2103/22C08G65/3322C08G65/33306C08G65/3331C08G2650/04C04B14/104C04B24/045C04B22/08C04B22/143C04B2103/408C04B24/42
Inventor 承忠富
Owner 芜湖恒固混凝土材料有限公司
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