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Early-strength polycarboxylate superplasticizer and preparation method and application thereof

A polycarboxylate and early-strength type technology, which is applied in the field of early-strength polycarboxylate water reducer and its preparation, can solve the problems of long concrete setting time, inconspicuous early-strength effect, poor dispersion, etc., and achieve early-strength effect Good, guaranteed strength, high compressive strength effect

Inactive Publication Date: 2019-12-24
余娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional naphthalene-based early-strength water-reducer can no longer meet the requirements of concrete due to factors such as poor dispersion, low water-reducing rate, insignificant early-strength effect, and long concrete setting time.

Method used

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  • Early-strength polycarboxylate superplasticizer and preparation method and application thereof
  • Early-strength polycarboxylate superplasticizer and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] In the embodiment of the present invention, an early-strength polycarboxylate water reducer is composed of the following raw materials in parts by weight: 55 parts of polyacrylic acid, 33 parts of ethylenediaminetetraacetic acid, 5 parts of rectorite, and 15 parts of woody fragrance , 8 parts of polyethyleneimine.

[0021] Add deionized water 10 times its mass to polyacrylic acid, stir for 5 minutes, then add polyethyleneimine, then raise the temperature to 55°C, and treat at this temperature for 300 minutes to prepare a polyacrylic acid mixture for use. Grind and pass through an 80-mesh sieve, add 8 times the mass of absolute ethanol, heat to 70°C and stir for 20 minutes, then perform ultrasonic treatment for 30 minutes with an ultrasonic power of 800W to obtain ultrasonic treatment solution A. Crush the rectorite and pass through a 200-mesh sieve, then add ethylenediaminetetraacetic acid and mix with deionized water 4 times the mass of the rectorite, and then heat up ...

Embodiment 2

[0023] In the embodiment of the present invention, an early-strength polycarboxylate water reducer is composed of the following raw materials in parts by weight: 63 parts of polyacrylic acid, 42 parts of ethylenediaminetetraacetic acid, 12 parts of rectorite, and 23 parts of woody , 14 parts of polyethyleneimine.

[0024] Add 12 times the mass of deionized water to polyacrylic acid, stir for 10 minutes, then add polyethyleneimine, then raise the temperature to 60°C, and treat at this temperature for 40 minutes to prepare a polyacrylic acid mixture for use. Grind and pass through a 120-mesh sieve, add 10 times the mass of absolute ethanol, heat to 75°C and stir for 30 minutes, then perform ultrasonic treatment for 40 minutes with an ultrasonic power of 1000W to obtain ultrasonic treatment solution A. Crush the rectorite and pass through a 200-mesh sieve, then add ethylenediaminetetraacetic acid and mix with deionized water 5 times the mass of the rectorite, and then heat up to ...

Embodiment 3

[0026] In the embodiment of the present invention, an early-strength polycarboxylate water reducer is composed of the following raw materials in parts by weight: 57 parts of polyacrylic acid, 35 parts of ethylenediaminetetraacetic acid, 7 parts of rectorite, and 17 parts of woody fragrance , 10 parts of polyethyleneimine.

[0027] Add 11 times the mass of deionized water to polyacrylic acid, stir for 8 minutes, then add polyethyleneimine, then raise the temperature to 60°C, and treat at this temperature for 40 minutes to prepare a polyacrylic acid mixture for use. Grind and pass through a 120-mesh sieve, add 9 times the mass of absolute ethanol, heat to 75°C and stir for 30 minutes, then perform ultrasonic treatment for 40 minutes with an ultrasonic power of 1000W to obtain ultrasonic treatment solution A. Crush the rectorite and pass through a 200-mesh sieve, then add ethylenediaminetetraacetic acid and mix with deionized water 4.5 times the mass of the rectorite, and then he...

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Abstract

The invention discloses an early-strength polycarboxylate superplasticizer and a preparation method and application thereof. The early-strength polycarboxylate superplasticizer is prepared from, by weight, 55-63 parts of polyacrylic acid, 33-42 parts of ethylenediamine tetraacetic acid, 5-12 parts of rectorite, 15-23 parts of radix aucklandiae and 8-14 parts of polyethyleneimine. The method includes: adding deionized water is added into polyacrylic acid, then adding polyethyleneimine, and performing thermal treatment to prepare a polyacrylic acid mixed solution; grinding and sieving the radixaucklandiae, adding absolute ethyl alcohol, carrying out heating treatment, and then carrying out ultrasonic treatment to prepare an ultrasonic treatment solution A; crushing and sieving rectorite, then adding the ethylenediamine tetraacetic acid and deionized water and performing ultrasonic treatment, so that an ultrasonic treatment liquid B is prepared; and mixing the ultrasonic treatment liquidA and the ultrasonic treatment liquid B, carrying out thermal treatment, and filtering the reaction product, colleting supernatant, adding a polyacrylic acid mixed solution, and carrying out thermaltreatment. The early strength agent has the advantages of low agent mixing amount, good early strength effect, reinforcement corrosion prevention, high compressive strength and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an early-strength polycarboxylate water reducer and its preparation method and application. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. Among them, the polycarboxylate high-performance water reducer (liquid) is the third generation of high-performance water reducer developed after the ordinary water reducer represented by wood calcium and the high-efficiency water reducer represented by naphthalene. At present, it i...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B103/30
CPCC04B40/0039C04B2103/302C04B24/2641C04B24/123C04B14/04C04B24/00C04B24/2652
Inventor 余娟
Owner 余娟
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