Slow-release high-slump-retaining type water reducing agent and preparation method thereof

A high-slump-preserving, water-reducing agent technology, applied in the field of water-reducing agents, can solve problems such as the failure of normal pouring of concrete, difficulties in pumping or dense molding, waste of manpower and material resources, etc., to ensure performance, improve adsorption-dispersion capacity, Good adsorption and dispersion effect

Inactive Publication Date: 2022-03-29
何武顺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Concrete slump loss is a problem often encountered in the use of commercial concrete. In hot weather or long-distance transportation, concrete raw materials vary greatly, and concrete has problems such as excessive slump loss and poor workability. As a result, it is difficult to pump or compact the concrete during on-site pouring, and the concrete cannot be poured normally, which affects the construction efficiency and greatly wastes manpower and material resources

Method used

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  • Slow-release high-slump-retaining type water reducing agent and preparation method thereof
  • Slow-release high-slump-retaining type water reducing agent and preparation method thereof
  • Slow-release high-slump-retaining type water reducing agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A slow-release high-slump-retaining water reducer, comprising the following raw materials in parts by mass: 800 parts of polyether macromonomer, 20 parts of acrylic acid, 60 parts of isopentenyl phthalate, and 50 parts of sodium methacrylate , 5 parts of redox initiator, 30 parts of chain transfer agent, 3000 parts of deionized water;

[0033] The preparation method of the slow-release high slump-retaining water reducer comprises the following steps:

[0034] Step 1: Take the polyether macromonomer in parts by mass and place it in a reaction container, add 4 / 10 parts by mass of deionized water, stir at a speed of 100r / min until the polyether macromonomer is completely dissolved, and then add The parts by mass of acrylic acid, isopentenyl phthalate, sodium methacrylate and 5 / 10 parts by mass of deionized water are heated in a water bath at a temperature of 60°C and stirred for 2 to 3 hours at the same time to obtain the monomer mixed solution;

[0035] Step 2: Take the...

Embodiment 2

[0038] A slow-release high-slump-retaining water reducer, including the following raw materials in parts by mass: 1,000 parts of polyether macromonomer, 40 parts of acrylic acid, 80 parts of isopentenyl phthalate, and 70 parts of sodium methacrylate , 15 parts of redox initiator, 60 parts of chain transfer agent, 5000 parts of deionized water;

[0039] The preparation method of the slow-release high slump-retaining water reducer comprises the following steps:

[0040] Step 1: Take the polyether macromonomer in parts by mass and place it in a reaction container, add 4 / 10 parts by mass of deionized water, stir at a speed of 300r / min until the polyether macromonomer is completely dissolved, and then add The parts by mass of acrylic acid, isopentenyl phthalate, sodium methacryl sulfonate and 5 / 10 parts by mass of deionized water are heated in a water bath at a temperature of 80°C and stirred for 3 hours at the same time to obtain a monomer mixture ;

[0041] Step 2: Take the red...

Embodiment 3

[0044] A slow-release high-slump-retaining water reducer, comprising the following raw materials in parts by mass: 900 parts of polyether macromonomer, 30 parts of acrylic acid, 70 parts of isopentenyl phthalate, and 60 parts of sodium methacrylate , 10 parts of redox initiator, 45 parts of chain transfer agent, 4000 parts of deionized water;

[0045] The preparation method of the slow-release high slump-retaining water reducer comprises the following steps:

[0046]Step 1: Take the polyether macromonomer in parts by mass and place it in a reaction container, add 4 / 10 parts by mass of deionized water, stir at a speed of 200r / min until the polyether macromonomer is completely dissolved, and then add The parts by mass of acrylic acid, isopentenyl phthalate, sodium methacrylate and 5 / 10 parts by mass of deionized water are heated in a water bath at a temperature of 70°C and stirred for 2 hours at the same time to obtain a monomer mixture ;

[0047] Step 2: Take the redox initia...

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Abstract

The invention relates to the technical field of water reducing agents, in particular to a slow-release high-slump-retaining water reducing agent and a preparation method thereof. Comprising the following raw materials in parts by mass: 800-1000 parts of a polyether macromonomer, 20-40 parts of acrylic acid, 60-80 parts of isopentene phthalate, 50-70 parts of sodium methallyl sulfonate, 5-15 parts of a redox initiator, 30-60 parts of a chain transfer agent and 3000-5000 parts of deionized water. The water reducing agent slowly releases carboxyl and sulfonic acid groups in an alkaline environment of concrete, the fluidity of the concrete is kept for a long time, the ester group hydrolysis speed is lower, long-time slow release can be achieved, good slow release and high collapse protection performance are achieved, meanwhile, the later adsorption-dispersion capacity of the polycarboxylic acid water reducing agent is improved, and the service life of the water reducing agent is prolonged. Therefore, the slump loss of the concrete is slowed down.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a slow-release high-collapse water reducer and a preparation method thereof. Background technique [0002] The development of modern science and technology provides the possibility for the development of high-quality concrete. The use of various additives in concrete enables concrete to be transported and pumped over long distances with little reduction in concrete strength. With the improvement of engineering quality requirements, building construction puts forward higher and higher requirements on the rheological properties of concrete mixtures. The currently widely used water reducers still have many limitations in performance, and it is necessary to make significant breakthroughs in synthesis technology and compounding technology in order to meet the continuous new requirements of construction. For example, only with good fluidity retention, High slump retention can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F218/16C08F228/02C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F220/06C08F218/16C08F228/02
Inventor 何武顺
Owner 何武顺
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