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Retarding and slump retaining type water reducing agent and preparation method thereof

A slump-preserving and water-reducing agent technology, applied in the field of concrete admixtures, can solve problems such as waste of cement, insufficient slump retention, and water-reducing agent slump loss.

Inactive Publication Date: 2021-10-19
甘肃新纪元建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-reducing water-reducing agent has a high water-reducing rate, but the slump retention is insufficient; the retarding-type water-reducing agent has a significant retarding effect, but sometimes causes concrete bleeding and segregation; Good performance, but the water-reducing rate is low, so it is often necessary to compound and use multiple functions in construction, so as to improve the water-reducing and setting-retarding effect of concrete and improve the workability
[0003] Concrete is a highly alkaline material. Especially when concrete is used in summer, it is necessary to reduce its alkalinity to achieve the purpose of retarding. The retarding superplasticizer can delay the setting time of concrete and improve the plastic retention time of freshly mixed concrete. In order to improve the construction efficiency, but in the construction process, the slump loss of the water reducing agent is fast, which will cause problems such as bleeding, segregation, strength reduction and poor workability of the concrete, and waste cement to increase the construction cost

Method used

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  • Retarding and slump retaining type water reducing agent and preparation method thereof
  • Retarding and slump retaining type water reducing agent and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0026] This embodiment provides a synthesis process of octenol polyoxybutylene ether macromer. The specific process is: add 0.005 g of sodium hydride to 10 g of 3-hydroxyoctenol, heat to 35 ° C for 0.5 h, and then add 90g of 3-hydroxyoctenol, under nitrogen replacement, control the reaction temperature, add 24g of butylene oxide at 100°C to initiate ring-opening polymerization, raise the temperature to 125°C, add 216g of butylene oxide to continue ring-opening polymerization for 1h, degas Serve after cooling.

Embodiment 2

[0028] This embodiment provides a synthesis process of octenol polyoxybutylene ether macromonomer. The specific process is: add 0.015 g of sodium hydride to 15 g of 3-hydroxyoctenol, heat to 45 ° C for 0.5 h, and then add 85g of 3-hydroxyoctenol, under nitrogen replacement, control the reaction temperature, add 60g of butylene oxide at 105°C to initiate ring-opening polymerization, raise the temperature to 135°C, add 440g of butylene oxide to continue ring-opening polymerization for 1.2h, remove Serve after air cooling.

Embodiment 3

[0030] This example provides a synthesis process of octenol polyoxybutylene ether macromonomer. The specific process is: add 0.03 g of sodium hydride to 20 g of 3-hydroxyoctenol, heat to 55 ° C for 1 hour, and then add 80 g 3-Hydroxyoctenol, under nitrogen replacement, control the reaction temperature, add 98g of butylene oxide at 110°C to initiate ring-opening polymerization, raise the temperature to 140°C, add 602g of butylene oxide to continue ring-opening polymerization for 1.4h, degas Serve after cooling.

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Abstract

The invention relates to the field of concrete admixtures in building materials, in particular to a retarding and slump retaining type water reducing agent and a preparation method thereof. The retarding and slump retaining type water reducing agent is prepared from the following components in parts by mass: 80 to 120 parts of an octenol polyoxybutylene ether macromonomer, 30 to 70 parts of an unsaturated carboxylic acid micromonomer, 20 to 40 parts of amide, 10 to 25 parts of a functional monomer A, 2 to 5 parts of a functional monomer B, 1 to 4 parts of an initiator, 0.4 to 0.9 part of a chain transfer agent, 2 to 5 parts of a pH regulator and 200 to 300 parts of water, wherein the functional monomer A is at least one selected from the group consisting of sodium hexametaphosphate, sodium pyrophosphate, 3-hydroxyvaleric acid, lactic acid, tetrametaphosphoric acid, sodium tetrametaphosphate and phosphorus pentoxide; and the functional monomer B is at least one selected from the group consisting of nylon 66, polyhexamethylene sebacamide and EDTA. The polycarboxylic acid water reducing agent prepared by the preparation method disclosed by the invention has retarding and slump retaining effects at the same time, the whole preparation process is safe and reliable, operation is simple and convenient, no harm is caused to the environment, and the polycarboxylic acid water reducing agent has wide application prospects in the field of concrete.

Description

technical field [0001] The invention relates to the field of concrete admixtures in building materials, in particular to a slow-set slump-preserving water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer, and it is an indispensable concrete admixture in various major projects in our country. According to its functional characteristics, it can be divided into water-reducing type, retarding type, early-strength type, anti-rust type, waterproof type, comprehensive type, etc. The water-reducing water-reducing agent has a high water-reducing rate, but the slump retention is insufficient; the retarding-type water-reducing agent has a significant retarding effect, but sometimes causes concrete bleeding and segregation; Good performance, but the water-reducing rate is low, so it is often necessary to compound and use multiple functions in construction, so as to impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F226/06C08G65/28C08G65/327C08G65/333C08G65/332C08G65/338C04B24/26C04B103/30
CPCC08F283/065C08G65/2609C08G65/338C08G65/327C08G65/33313C08G65/33306C08G65/33324C08G65/3322C04B24/2658C04B2103/302C08F226/06
Inventor 李建永贾亨科
Owner 甘肃新纪元建材有限公司