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Efficient concrete additive and preparation method thereof

A concrete and additive technology, applied in the field of concrete additives, can solve the problem of low grafting rate of maleic anhydride grafted beta-cyclodextrin macromonomer, poor adaptability of fly ash, stone powder and clay materials, storage and transportation The process is easy to grow mold and other problems, so as to achieve the effect of low preparation cost, high popularization and application value, and good slump retention.

Inactive Publication Date: 2019-11-12
刘艳蕊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used concrete water reducer is polyether polycarboxylate water reducer. This type of water reducer has good slump retention and low cost. However, due to its fast adsorption, it is not suitable for fly ash, stone powder, and clay materials. bad sex
Other additives in the prior art are more or less large in dosage, poor in water-reducing performance, poor in plasticizing effect, single in function, easy to deteriorate, easy to grow mold and deteriorate during storage and transportation, and then emit foul smell. The disadvantage of reducing, or completely losing efficacy, cannot meet the requirements of the market
[0005] Chinese patent CN102153711A reports a macromer of allyl sulfonate monomer, acrylic acid monomer, polyethylene glycol monomethyl ether methacrylate and maleic anhydride grafted β-cyclodextrin A retarded polycarboxylate superplasticizer is obtained through free radical copolymerization, so that the obtained polycarboxylate superplasticizer has better retarding performance, micro air-entraining performance and better flow performance, but this The inventive maleic anhydride grafted β-cyclodextrin macromonomer has a low graft rate and is greatly affected by temperature, so it cannot fundamentally solve the problem of concrete slump loss under different conditions, which is not conducive to large-scale production and application

Method used

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  • Efficient concrete additive and preparation method thereof
  • Efficient concrete additive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method for concrete high-efficiency additives, comprising the steps of:

[0030] Ⅰ Preparation of chlorinated polyethylene glycol monomethyl ether: under the protection of nitrogen atmosphere, add 20 g of anhydrous pyridine, 42.4 g of polyethylene glycol monomethyl ether and 100 g of anhydrous toluene to a three-necked flask in sequence, and heat up to 35 °C Slowly add 10 g of thionyl chloride dropwise to the three-necked flask, finish dropping within 2 hours, and react at constant temperature for 3 hours; stand for stratification, filter the upper layer solution, spin evaporate, filter after cooling, and distill off the solvent to obtain chlorinated Polyethylene glycol monomethyl ether;

[0031] II Preparation of ionized naphthalenesulfonic acid compounds: 26.8g of chlorinated polyethylene glycol monomethyl ether and 10g of 7,7'-iminobis(4-hydroxy-2-naphthalenesulfonic acid) prepared through step I Add it to 120 g of acetone, stir and react at 40°C for 6...

Embodiment 2

[0036] A preparation method for concrete high-efficiency additives, comprising the steps of:

[0037] Ⅰ Preparation of chlorinated polyethylene glycol monomethyl ether: under the protection of a helium atmosphere, add 20 g of anhydrous pyridine, 42.4 g of polyethylene glycol monomethyl ether and 110 g of anhydrous toluene to a three-necked flask successively, and raise the temperature to 37°C Then slowly add 10 g of thionyl chloride dropwise to the three-necked flask, finish dropping within 2 hours, and react at a constant temperature for 3.5 hours; stand for stratification, filter the upper layer solution, spin evaporate, filter after cooling, and distill off the solvent to obtain chlorine Polyethylene glycol monomethyl ether;

[0038] II Preparation of ionized naphthalenesulfonic acid compounds: 26.8g of chlorinated polyethylene glycol monomethyl ether and 10g of 7,7'-iminobis(4-hydroxy-2-naphthalenesulfonic acid) prepared through step I Add it to 130 g of acetone, stir and...

Embodiment 3

[0043] A preparation method for concrete high-efficiency additives, comprising the steps of:

[0044] Ⅰ Preparation of chlorinated polyethylene glycol monomethyl ether: under the protection of a neon atmosphere, add 20 g of anhydrous pyridine, 42.4 g of polyethylene glycol monomethyl ether and 135 g of anhydrous toluene to a three-necked flask successively, and heat up to 40 °C Then slowly add 10 g of thionyl chloride dropwise to the three-necked flask, finish dropping within 2 hours, and react at a constant temperature for 4 hours; stand for stratification, filter the upper layer solution, spin evaporate, filter after cooling, and distill off the solvent to obtain chlorine Polyethylene glycol monomethyl ether;

[0045] II Preparation of ionized naphthalenesulfonic acid compounds: 26.8g of chlorinated polyethylene glycol monomethyl ether and 10g of 7,7'-iminobis(4-hydroxy-2-naphthalenesulfonic acid) prepared through step I Add it to 145 g of acetone, stir and react at 50°C fo...

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Abstract

The invention discloses a preparation method of efficient concrete additive. The preparation method comprises the following steps: (I) preparing chloro-polyethylene glycol monomethyl ether; (II) preparing an ionized naphthalene sulfonic acid type compound; (III) preparing polycondensate; and (IV) preparing a water reduction agent product. The invention further discloses the efficient concrete additive prepared by using the preparation method of the efficient concrete additive. The efficient concrete additive disclosed by the invention is remarkable in water reduction effect, low in slump loss,good in bleeding resistance and freezing resistance, good in adaptability to cement, and capable of effectively improving the dispersibility of cement, greatly improving the peaceability of concreteand improving various mechanical properties of concrete.

Description

technical field [0001] The invention relates to the technical field of concrete additives, in particular to a high-efficiency concrete additive and a preparation method thereof. Background technique [0002] Concrete material is obtained by using cement as gel material, sand and stone as aggregate, mixed with water in a certain proportion, and stirred. Due to its high compressive strength, good fire resistance, flexible use, convenient construction, abundant raw materials, low price, and simple production process, it has become one of the most widely used and used building materials in the world today. Irreplaceable roles and functions. [0003] In practical engineering applications, concrete is often exposed to various harsh environments, such as the intrusion of corrosive media around the environment, changes in environmental temperature and humidity, freeze-thaw cycle damage, and some concrete projects are often under heavy load wear, etc. These external conditions Will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B24/22C08G65/333C08G65/334C04B103/30C04B103/60C04B103/61C04B103/65C04B103/22
CPCC04B24/22C04B40/0039C04B2103/22C04B2103/302C04B2103/304C04B2103/308C04B2103/601C04B2103/61C04B2103/65C08G65/33396C08G65/3348C04B24/2641C04B22/00C04B24/02
Inventor 刘艳蕊石桂珍葛军营
Owner 刘艳蕊
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