Super high-early-strength type polycarboxylate superplasticizer and preparation method thereof

A super early-strength, polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problem of slow strength development, achieve the effects of stable strength growth in the middle and late stages, improve construction progress, and speed up formwork turnover

Inactive Publication Date: 2017-05-31
上海高铁化学建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a super-early-strength polycarboxylate superplasticizer and its preparation method to overcome the problems that the existing polycarboxylate superplasticizer delays the hydration of cement and slows the development of early strength

Method used

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  • Super high-early-strength type polycarboxylate superplasticizer and preparation method thereof
  • Super high-early-strength type polycarboxylate superplasticizer and preparation method thereof
  • Super high-early-strength type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 210g of water, 200g of methacryl alcohol polyoxyethylene ether (HPEG3600), 3.0g of ethyl acrylate and 3.0g of hydrogen peroxide into a 1000ml round-bottomed three-necked flask as the reaction bottom liquid.

[0025] Prepare solution A: mix 32.0 g of acrylic acid, 2.0 g of acrylamide and 40 g of water and put them in the dropping funnel.

[0026] Preparation of solution B: mix 1.0 g vitamin C, 2.0 g mercaptopropionic acid and 60 g water and put them in the dropping funnel.

[0027] Stir until the monomers in the flask are dissolved, and raise the temperature to 70°C. Immediately start adding liquid A and liquid B dropwise at the same time. Solution A will be dropped in 3.0 hours at the same time, and solution B will be dropped in 3.5 hours. After continuing the heat preservation reaction for 0.5 hours, add 5.0 The ethanolamine is partially neutralized, the pH value of the solution is adjusted to 6-7 with a sodium hydroxide solution, and water is replenished to obtain...

Embodiment 2

[0029] Add 210g of water, 200g of methacryl alcohol polyoxyethylene ether (HPEG4000), 3.5g of butyl acrylate as the reaction bottom liquid, 2.0g of ammonium persulfate and 1.0g of hydrogen peroxide into a 1000ml round bottom three-neck flask.

[0030] Preparation of solution A: Mix 28g of acrylic acid, 3.0g of AMPS and 30g of water and put them in the dropping funnel.

[0031] Preparation of solution B: Mix 2.5 grams of mercaptopropionic acid, 1.0 grams of scallops and 60 g of water and put them in a dropping bottle.

[0032] Stir until the monomers in the flask are dissolved, and raise the temperature to 70°C. Immediately start adding liquid A and liquid B dropwise at the same time. Liquid A drops in 2.0 hours, and liquid A drops in 2.5 hours. After continuing the heat preservation reaction for 1 hour, add 4.5 grams of The isopropanolamine is partially neutralized, the pH value of the solution is adjusted to 6-7 with sodium hydroxide solution, and water is replenished to obta...

Embodiment 3

[0034] Add 210 g of water, 200 g of methacryl alcohol polyoxyethylene ether (HPEG5000), 3.2 g of propyl acrylate, and 3.0 g of ammonium persulfate into a 1000 ml round-bottomed three-necked flask as the reaction bottom liquid.

[0035] Prepare solution A: mix 30g of acrylic acid, 3.0g of N-N dimethylacrylamide and 40g of water and put them in the dropping funnel.

[0036] Preparation of solution B: mix 0.5 g of Diaoba, 1.5 g of mercaptopropionic acid, 0.8 g of vitamin C and 60 g of water and put them in the dropping funnel.

[0037] Stir until the monomers in the flask are dissolved, and raise the temperature to 50°C. Immediately start adding liquid A and liquid B dropwise at the same time. Liquid A drops in 3.0 hours, and liquid A drops in 3.5 hours. After continuing to keep warm for 0.5 hours, add 4.8 grams of three The propanolamine is partially neutralized, the pH value of the solution is adjusted to 6-7 with a sodium hydroxide solution, and water is replenished to obtain ...

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Abstract

The invention discloses a super high-early-strength type polycarboxylate superplasticizer and a preparation method thereof. The method comprises the following steps: putting water, unsaturated polyoxyethylene ether, early strength group monomer and oxidizing initiator into a reaction kettle; stirring till dissolving; heating to 30-80 DEG C; adding prepared solution A and solution B; maintaining the temperature for 1-2h, and then adding alkali and neutralizing till pH is 6-7; and replenishing water till the solid content is 40-45%, thereby acquiring the super high-early-strength type polycarboxylate superplasticizer. The super high-early-strength type polycarboxylate superplasticizer and the preparation method thereof have the beneficial effects that a long lateral chain is introduced into a polycarboxylic acid macromolecule main chain; the longer the lateral chain is, the better the dispersibility of the superplasticizer is; the density of the long lateral chain is reduced; the steric hindrance is reduced; the cement hydration is quicker; an early strength group is introduced into superplasticizer molecules, so that the cement hydration speed can be further increased and the early strength of the concrete can be greatly promoted; and the problems of the present polycarboxylate superplasticizer that the hydration of the cement is delayed and the early strength development is slow can be solved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a super early strength polycarboxylate water reducer and a preparation method thereof. The water reducer can significantly improve the early strength of concrete without delaying the setting time of cement, and is specifically a super early strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the third generation of high-performance concrete admixture, which has the advantages of low dosage, good dispersion, and large degree of freedom in molecular structure. It has been widely used in various concrete projects and achieved good results. . The current polycarboxylate superplasticizer delays the hydration of cement to a certain extent, especially when the curing temperature is low. Due to the slow development of its early strength, its use in cold climates and the field of prefabrica...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/18C08F220/56C08F220/58C08F220/54C08F4/40C04B24/16C04B24/26C04B103/30
CPCC08F283/065C04B24/165C04B24/2694C04B2103/0059C04B2103/302C08F4/40C08F220/06
Inventor 王健全
Owner 上海高铁化学建材有限公司
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