Mud-resistant and slump-retaining polycarboxylate superplasticizer and preparation method thereof

A technology of slump-preserving polycarboxylate, which is applied in the field of slump-preserving polycarboxylate water reducer and its preparation, and anti-mud, which can solve the problem of increasing loss of slump and expansion over time, increasing production and operation costs, Abnormal coagulation time and other problems can be achieved to improve the workability and mechanical properties, enhance the competitive adsorption capacity, and improve the complexation ability

Pending Publication Date: 2020-10-16
中建西部建设新疆有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the rise of the construction industry, infrastructure projects have increased dramatically, and the aggregate consumption of sand and gravel is huge. However, high-quality sand and gravel resources are increasingly scarce. The use of degraded sand and gravel resources is faced with problems such as large mud content and high impurity content in aggregates.
In particular, the Gobi materials distributed in Xinjiang are usually mainly natural sand and pebbles, and the sand fault gradation phenomenon is serious, the pebbles are too large (20-40mm), and the aggregate mud content is large (up to 19wt%), and the mud content is mainly Mainly montmorillonite and silty clay; when it is applied to the preparation of concrete mixture, it will absorb a large amount of admixtures and water, causing the volume of the concrete mixture to expand and turn into a paste, and the fluidity and workability will change. Poor, and the volume shrinkage is obvious after hardening and dehydration, and the strength is far lower than the design strength
Ordinary polycarboxylate superplasticizers are very sensitive to the mud content in sand and gravel. With the increase of mud content in sand and gravel, polycarboxylate superplasticizers are adsorbed by clay in large quantities during use, making polycarboxylate superplasticizers The d...

Method used

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  • Mud-resistant and slump-retaining polycarboxylate superplasticizer and preparation method thereof
  • Mud-resistant and slump-retaining polycarboxylate superplasticizer and preparation method thereof
  • Mud-resistant and slump-retaining polycarboxylate superplasticizer and preparation method thereof

Examples

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Embodiment 1

[0033] A mud-resistant, slump-preserving polycarboxylate superplasticizer, its synthesis route is shown in formula II and formula III, and its preparation method includes the following steps:

[0034] Add 2.6 parts of MA and 4.1 parts of HPAA into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, stir and react at 60°C for 2 hours (500r / min), after cooling to room temperature, add 27.4 parts of TPEG, 28.8 3 parts of water and 0.5 parts of APS, and react at 60°C until the TPEG macromonomer is completely dissolved, then start to add solution A (0.3 parts of TGA, 14.4 parts of water) and solution B (4.5 parts of AA, 2.8 parts of MMA, 12.3 parts of deionized water), control the dropping time for 3 hours, after the dropping, keep the temperature at 60°C for 1 hour, adjust the pH value of the reaction solution to 6-7 with 30wt% NaOH solution, and obtain the mud-resistant and slump-preserving polycarboxylate superplasticizer PCE-1 (relative molecular...

Embodiment 2

[0037] A mud-resistant, slump-preserving polycarboxylate water reducer, the preparation method of which comprises the following steps:

[0038] Add 2.6 parts of MA and 4.1 parts of HPAA into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, stir and react at 60°C for 2 hours (500r / min), after cooling to room temperature, add 27.4 parts of HPEG, 28.8 parts into the three-necked flask part of water and 0.5 part of APS, and react at 60°C until the HPEG macromonomer is completely dissolved, start to add solution A (0.3 parts of TGA, 14.4 parts of water) and solution B (4.5 parts of AA, 2.8 parts of MMA, 12.3 parts of water) dropwise, and control Adding time is 3 hours. After the dropping, keep warm for 1 hour. Use 30% NaOH solution to adjust the pH value of the reaction solution to 6-7 to obtain mud-resistant and slump-preserving polycarboxylate superplasticizer PCE-2 (relative molecular weight 52648; 36.4% solids).

Embodiment 3

[0040] A mud-resistant, slump-preserving polycarboxylate water reducer, the preparation method of which comprises the following steps:

[0041]Add 3.0 parts of MA and 5.8 parts of HPAA into a three-necked flask equipped with a thermometer, a stirrer, and a reflux condenser, stir and react at 60°C for 2 hours (500r / min), and after cooling to room temperature, add 25.9 parts of TPEG, 27.1 part of water and 0.5 part of APS, reacted at 60°C until the TPEG macromonomer was completely dissolved, began to dropwise add solution A (0.4 parts of TGA, 13.6 parts of water) and solution B (3.1 parts of AA, 3.6 parts of MMA, 11.6 parts of water), and control Adding time is 3 hours. After the dropping, keep warm for 1 hour. Use 30% NaOH solution to adjust the pH value of the reaction solution to 6-7 to obtain mud-resistant and slump-preserving polycarboxylate superplasticizer PCE-3 (relative molecular weight 65711; 37.1% solids).

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Abstract

The invention discloses a mud-resistant and slump-retaining type polycarboxylate superplasticizer. The method comprises the following steps: firstly, performing esterification reaction on maleic anhydride and 2-hydroxyphosphonoacetic acid under heating and stirring conditions to obtain a mud-resistant functional monomer; and then introducing a hydrophobic polyether macromonomer, acrylic acid and amethyl methacrylate monomer to carry out free radical polymerization. According to the mud-resistant and slump-retaining type polycarboxylate superplasticizer, the mud-resistant and slump-retaining properties of the obtained fresh concrete can be effectively guaranteed, and the workability and mechanical properties of the obtained fresh concrete are further improved; the applicability to cement types, gravel quality and the like is high, and technical support can be provided for application of the gobi material in the Xinjiang region in concrete; and the related preparation method is simple,mild in reaction condition, environment-friendly and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of admixtures, and in particular relates to a mud-resistant and slump-retaining polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, and strong designability of molecular structure. It has become one of the mainstream concrete admixtures in the world. However, with the rise of the construction industry and the rapid increase of infrastructure projects, the consumption of sand and gravel aggregates is huge, but high-quality sand and gravel resources are increasingly scarce, and the use of degraded sand and gravel resources faces problems such as large mud content and high impurity content in aggregates. In particular, the Gobi materials distributed in Xinjiang are usually mainly natural sand and pebbles, and the sand fault gradation phenomenon is serious, the pebbles are too la...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F230/02C08F220/14C04B24/26C04B103/30
CPCC08F283/065C04B24/246C04B2103/302C08F220/06C08F230/02C08F220/14
Inventor 张平刘洋艾洪祥王军韩世界卢霄
Owner 中建西部建设新疆有限公司
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