Ethers early strength type polycarboxylate water reducer and preparation method thereof

An early-strength polycarboxylate technology, which is applied in the field of ether-based early-strength polycarboxylate water reducers and their preparation, can solve the problems of reducing 28d strength, achieve superior early-strength performance, stable performance, and easy control of conditions Effect

Active Publication Date: 2013-12-18
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are many problems in the application of composite early-strength superplasticizers. Some early-strength agents contain chlorine salts, and chlorine-containing admixtures are prohibited from being used in reinforced concrete and prestressed concrete structural engineering, and although the composite type Early strength water reducer can increase the early strength of concrete, but also reduce its 28d strength

Method used

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  • Ethers early strength type polycarboxylate water reducer and preparation method thereof
  • Ethers early strength type polycarboxylate water reducer and preparation method thereof
  • Ethers early strength type polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Amidation reaction: Add 62g of diethanol monoisopropanolamine (DIEPA), 80g of methyl acrylate (or 85g of methyl methacrylate), and 2.5g of concentrated sulfuric acid into a four-necked flask, and start the stirring device, at 75 The temperature was kept at ℃ for 3 hours to obtain the amide small monomer.

[0027] (2) Copolymerization reaction: Weigh 5 g of amide small monomer, 2 g of 2-acrylamido-methylpropanesulfonic acid (AMPS) and 150 g of TPEG with a molecular weight of 1000, add them into a four-necked flask together with 200 g of water, and heat up to 55 ℃. Add the aqueous solution of ammonium persulfate (can also be replaced by potassium persulfate) (1.2g ammonium persulfate or potassium persulfate + 20g water) and the aqueous solution of thioglycolic acid (1.15g thioglycolic acid + 20g water) dropwise, and the dropping time is After 4 hours, the temperature was kept constant for 1.5 hours after the dropwise addition.

[0028] (3) Neutralization: cool down ...

Embodiment 2

[0031] (1) Amidation reaction: Add 65g of diethanol monoisopropanolamine (DIEPA), 90g of isooctyl acrylate, and 2.0g of p-toluenesulfonic acid into a four-neck flask, start the stirring device, and keep the temperature at 85°C for 3 hours. The amide small monomer is obtained.

[0032] (2) Copolymerization reaction: weigh 6g of amide small monomer, 2.5g of 2-acrylamido-methylpropanesulfonic acid (AMPS) and 160g of TPEG with a molecular weight of 2000, add them into a four-necked flask together with 190g of water, and heat up to 58°C. Add the aqueous solution of hydrogen peroxide (0.75g hydrogen peroxide + 25g water) and the aqueous solution of dodecyl mercaptan (1.05g dodecyl mercaptan + 25g water) respectively dropwise, the time for adding is 3 hours, and keep the temperature at 1.5 Hour.

[0033] (3) Neutralization: cool down to 40°C, adjust the pH value within the range of 6.0-7.0 with ammonia water (can also be replaced by calcium hydroxide, calcium oxide or ethanolamine)...

Embodiment 3

[0035] (1) Amidation reaction: Add 60g of diethanol monoisopropanolamine (DIEPA), 80g of maleic anhydride, 2.3g of sulfamic acid (can also be replaced by concentrated phosphoric acid or ethyl acetate) into a four-necked flask, start stirring The device was kept at a constant temperature of 100°C for 2 hours to obtain amide small monomers.

[0036](2) Copolymerization reaction: Weigh 5.5g of amide small monomer, 1.5g of 2-acrylamido-methylpropanesulfonic acid (AMPS) and 180g of TPEG with a molecular weight of 3000, add them into a four-necked flask together with 210g of water, and raise the temperature to 60°C. Add dropwise the aqueous solution of sodium azobisisobutyrimide hydrochloride (1.0g sodium azobisisobutyrimide hydrochloride + 20g water), 3-mercaptopropionic acid (you can also use isopropanol, sodium formate or 3-mercaptopropionic acid iso octyl ester) aqueous solution (1.25g 3-mercaptopropionic acid, isopropanol, sodium formate or 3-mercaptopropionic acid isooctyl es...

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Abstract

The invention discloses an ethers early strength type polycarboxylate water reducer and a preparation method thereof. The water reducer regards unsaturated esters, N,N-bis(2-hydroxyethyl)isopropanolamine (DIEPA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), methyl allyl polyoxyethylene polyoxypropylene ether (TPEG) and the like as main chemical synthesis raw materials, and the main chemical synthesis raw materials are subjected to amidation and copolymerization in certain conditions under the action of a catalyst, an initiator, a chain transfer agent and the like, so that a high-molecular polymer with an amphoteric structure is obtained. The molecular structure of the water reducer comprises hydrophilic hydroxyl, hydrophilic carboxyl, hydrophilic acylamino, hydrophilic sulfonyl, hydrophobic carbon chains and a polyoxyethylene polyoxypropylene ether long-chain structure with certain stereo-hindrance effects, wherein an N containing group can improve early strength of concrete obviously. Therefore, the ethers early strength type polycarboxylate water reducer is applicable to pre-cast concrete components which need improvement of early strength.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ether early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer, as a new type of high-performance superplasticizer, has low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and enhanced effect Obviously, a series of outstanding performance. At the same time, the production process is environmentally friendly and has been widely used in various engineering fields. [0003] With the increasing demand for prefabricated components in the construction of railways, highways, subways, etc., it is very important to study the early-strength polycarboxylate superplasticizer that is suitable for precast concrete, can significantly improve the early strength of concrete, and accelerate the turnover speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/36C08F220/58C08F220/06C08F2/38C04B24/16C04B103/30
Inventor 林艳梅方云辉林庆昌兰自栋沈建荣蒋卓君罗小峰郭鑫祺麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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