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Efficient slump retaining agent and preparation method thereof

A slump-retaining agent and high-efficiency technology, applied in the field of building materials, can solve the problems of high mud content and stone powder content in sand and gravel, slow down the construction progress, and greatly fluctuate in cement quality, and achieve the goal of improving workability and reducing energy consumption. Effect

Pending Publication Date: 2020-07-24
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large variety of cement in China and the large fluctuations in cement quality, the poor quality of concrete sand and gravel, for example, the high mud content and stone powder content in sand and gravel, and the poor quality of some machine-made sand, concrete collapse often occurs The rapid loss of sag increases the difficulty of concrete construction and quality control
During construction, sodium gluconate, sucrose and other retarding components are usually mixed with polycarboxylate superplasticizers to control the rapid loss of concrete slump, but too much addition will prolong the setting time of concrete and slow down construction. schedule

Method used

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  • Efficient slump retaining agent and preparation method thereof
  • Efficient slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 200g of hydroxybutyl vinyl polyglycol ether and 196g of water, put them in a three-necked flask, and stir mechanically at 40°C until the hydroxybutyl vinyl polyglycol ether is completely dissolved; add 1g of hydrogen peroxide, continue Stir for 5 minutes; stir 0.45g of sodium vitamin C, 1g of mercaptoethanol, and 38g of water in a beaker and start to drop them into a three-neck flask at a rate of 0.2g / min; after 10 minutes, add 7.6g of acrylic acid, 24.5g of hydroxyethyl Ester and 4g monomer diacrylamide dimethyl propane sulfonic acid were stirred evenly in a beaker and then added dropwise into a three-necked flask at a rate of 0.49g / min; after 3h, the dropwise addition was completed, and then the temperature was continued for 0.5h. After the reaction is finished, the material is discharged to obtain the product.

Embodiment 2

[0035] Mix 190g of prenyl polyethylene glycol ether and 203g of water under mechanical stirring at 45°C until completely dissolved; add 1g of hydrogen peroxide and continue stirring for 5 minutes; mix 0.5g of sodium vitamin C, 0.9g of mercaptoethanol, and 43g of water Stir evenly in the beaker and start to drop into the three-necked flask at a rate of 0.22g / min; 1. Stir 7g of acrylamide in the beaker and add it dropwise into the three-necked flask at a rate of 0.53g / min; after 3.5h, the dropwise addition is completed, and then continue to keep warm for 1h. After the reaction is finished, the material is discharged to obtain the product.

Embodiment 3

[0037] Mix 210g of hydroxybutyl vinyl polyethylene glycol ether and 195g of water under mechanical stirring at 50°C until completely dissolved; add 1g of ferrous sulfate and continue stirring for 10min; mix 0.56g of sodium vitamin C, 0.86g of mercaptoethanol, and After the water was stirred evenly in the beaker, it began to be added dropwise into the three-necked flask at a rate of 0.23g / min; Acrylamide dimethyl propane sulfonic acid was stirred evenly in the beaker and then added dropwise into the three-necked flask at a rate of 0.56g / min; the dropwise addition was completed in 3.5h, and then continued to keep warm for 1h. After the reaction is finished, the material is discharged to obtain the product.

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Abstract

The invention discloses an efficient slump retaining agent, which is prepared from the following components in parts by weight: 250-600 parts of a monomer A, 11-40 parts of a monomer B, 20-60 parts ofa monomer C, 5-15 parts of a monomer D, 1-20 parts of an initiator, 0.8-10 parts of a composite molecular weight regulator, 0.5-4 parts of vitamin C sodium and 300-700 parts of water, wherein the monomer A is any one or a mixture of more of isopentenyl polyethylene glycol ether, hydroxybutyl vinyl polyethylene glycol ether and ethoxy vinyl polyethylene glycol ether, the monomer B is any one or amixture of two of acrylic acid, fumaric acid, itaconic acid and maleic anhydride, the monomer C is any one or a mixture of more of hydroxyethyl acrylate, hydroxypropyl acrylate, methacryloyloxy phosphate and hydroxyethyl methacrylate, the monomer D is diacrylamide dimethyl propanesulfonic acid or acrylamide, and the composite molecular weight regulator is mercaptoethanol. The components are subjected to a stirring reaction to obtain the product. The efficient slump retaining agent provided by the invention is good in slump retaining performance, small in performance fluctuation and excellent in adaptability, and can effectively meet the slump retaining requirements of concrete in various regions.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a high-efficiency slump-retaining agent and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the third-generation superplasticizer after lignin and naphthalene series superplasticizers. It has low dosage, high water reducing rate, good fluidity and slump retention of fresh concrete, low shrinkage, It has the characteristics of excellent durability and strong molecular design. At the same time, it does not use formaldehyde in the production process, and has no waste liquid and gas discharge, etc., which has environmental protection performance. The invention of polycarboxylate superplasticizer has greatly improved the performance of concrete and promoted the continuous development of concrete technology. Therefore, polycarboxylate superplasticizers have been widely used in municipalities, railways, highways, ports, bridges, hydropow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F222/38C08F222/02C08F230/02C08F220/56C08F222/06C04B24/16C04B24/26
CPCC08F283/065C04B24/165C04B24/2694C04B2103/308C04B2103/302C08F220/06C08F220/20C08F222/385C08F222/02C08F230/02C08F220/56C08F222/06
Inventor 高毅潘呈恭揭鸣洲汪瑞悦程茗燊
Owner CHONGQING SANSHENG IND CO LTD
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