A kind of macromolecule retarder, its preparation method and application

A retarder and macromolecular technology, which is applied in the field of building material admixtures, can solve problems such as short retardation time and reduced concrete strength, and achieve the effects of avoiding adsorption and easy detachment, low production cost and stable performance

Active Publication Date: 2019-08-20
安徽森普新型材料发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the organic retarders in the prior art have the short retardation time and the disadvantages of reducing the strength of concrete

Method used

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  • A kind of macromolecule retarder, its preparation method and application
  • A kind of macromolecule retarder, its preparation method and application
  • A kind of macromolecule retarder, its preparation method and application

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preparation example Construction

[0025] The invention provides a kind of preparation method of macromolecule retarder, comprises the following steps:

[0026] Step S1, performing free radical polymerization on small unsaturated monomers containing epoxy groups to prepare intermediates;

[0027] Step S2, reacting the intermediate with an amino group-containing methylol compound to prepare a macromolecular retarder.

[0028] The present invention first utilizes free radical polymerization to polymerize the unsaturated small monomers containing epoxy groups to form the intermediates containing epoxy groups with a certain degree of polymerization. The free radical polymerization is carried out under stirring and under condensing conditions.

[0029] The solvent used in the radical polymerization reaction is a polar organic solvent miscible with water, and N,N-dimethylformamide or N-alkylpyrrolidone is preferably used in the present invention.

[0030] The initiator used in the radical polymerization reaction is...

Embodiment 1

[0041] 1.1 Weigh 50g of glycidyl acrylate, 0.25g of benzoyl peroxide, and 200g of N,N-dimethylformamide into a three-necked bottle, install a stirring device, a thermometer and a condenser, heat up to 80°C, and React at this temperature for 10 hours, then lower to normal temperature (25°C), to obtain an intermediate with an average degree of polymerization of about 10;

[0042] 1.2 Add 46g of tris to the intermediate obtained in step 1.1, and stir and react at room temperature (25°C) for 10 hours to obtain a macromolecule retarder;

[0043] 1.3 Add water to the macromolecular retarder obtained in step 1.2 to prepare the macromolecular retarder with a mass concentration of 40%.

Embodiment 2

[0045] 2.1 Weigh 50g of glycidyl acrylate, 0.2g of benzoyl peroxide, and 200g of N,N-dimethylformamide into a three-necked bottle, install a stirring device, a thermometer and a condenser, heat up to 90°C, and Reaction at this temperature for 8 hours, lowered to normal temperature (25°C), to obtain an intermediate with an average degree of polymerization of about 30;

[0046] 2.2 Add 46 g of tris to the intermediate obtained in step 2.1, and stir and react at room temperature (25° C.) for 11 hours to obtain a macromolecule retarder;

[0047] 2.3 Add water to the macromolecular retarder obtained in step 2.2 to prepare the macromolecular retarder with a mass concentration of 40%.

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Abstract

The invention discloses a macromolecular retarder as well as a preparation method and application thereof. The preparation method of the macromolecular retarder comprises the following steps: S1, enabling an unsaturated small monomer containing an epoxy group to be subjected to radical polymerization reaction to obtain an intermediate; S2, enabling the intermediate to react with a hydroxyl compound containing an amino group so as to prepare the macromolecular retarder. The preparation method adopts the radical polymerization reaction as well as the reaction of the epoxy group and the amino group, thus being simple in reaction mechanism; the preparation method is mild in reaction conditions, high in reaction efficiency, lower in production cost and conducive to popularization and application; the prepared macromolecular retarder is stable in performance, not only can be used for effectively adsorbing cement particles, but also can be used for partially coating the cement particles, thuspreventing the formation of crystals and achieving a retarding effect; furthermore, the larger the polymerization degree is, the better the coating effect is; after the cement particles are coated with the macromolecular retarder, the macromolecular retarder does not decompose, so that the adverse effect of a micromolecular retarder which easily gets away from the cement particles when being usedfor adsorbing can be avoided, and the later strength of concrete is not reduced.

Description

technical field [0001] The invention relates to the field of building material admixtures, in particular to a macromolecular retarder, its preparation method and application. Background technique [0002] Retarder is an admixture that can delay the setting time of concrete products. Commonly used retarders include: molasses retarder, hydroxycarboxylic acid and its salt retarder, lignosulfonate retarder, etc. In addition, some inorganic Salts such as zinc chloride, borate, and various phosphates also have retarding effects. [0003] The theories of setting retarder in concrete mainly include: adsorption theory, formation of complex salt theory, precipitation theory and control of calcium hydroxide crystal growth theory. At present, most organic retarders change the surface properties of solid particles through adsorption at the solid-liquid interface, that is, hydrophilicity; film layer. Due to the adsorption effect, a large number of hydroxyl groups are adsorbed on the su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/32C08F220/32C08F8/32C04B24/26C04B103/22
CPCC04B24/2641C04B2103/22C08F8/32C08F220/32C08F220/325
Inventor 程从亮张家如傅曹辉张思亮曹吉鑫汪德宝
Owner 安徽森普新型材料发展有限公司
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