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Anti-mud polycarboxylic acid slump retaining agent and preparation method thereof

A technology of slump retention agent and polycarboxylic acid, applied in the field of concrete admixtures, can solve the problems of high production cost and no obviousness, and achieve the effects of reducing production cost, environmental protection in the production process, and obvious anti-mud effect.

Inactive Publication Date: 2016-08-17
GUIZHOU TIEJIANHENGFA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slow-release polycarboxylate superplasticizer described in this invention needs high-temperature polymerization, the production cost is high, and it has no obvious effect on concrete with large mud content

Method used

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  • Anti-mud polycarboxylic acid slump retaining agent and preparation method thereof

Examples

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Effect test

example 1

[0021] Dissolve 4g of acrylic acid and 11g of hydroxyethyl acrylate in deionized water to make dripping solution A for later use, and dissolve 1.1g of chain transfer agent hypophosphite and VC0.45g of initiation aid in deionized water to make dropping solution B The material is set aside, and the initiator hydrogen peroxide (30%) 1.4g is dissolved in water to make C material and set aside. Add 155g of isopentenyl polyoxyethylene ether (TPEG) and 110g of deionized water into a 500ml container and stir to dissolve. After fully dissolving, add 3.2g of maleic anhydride and stir. After the dissolution, the dropwise addition temperature is 25- 30°C, add chain transfer agent and stir for 10 minutes, then add initiator material C and stir for 10 minutes, and at the same time, add material A and material B dropwise into the bottom liquid at a constant speed. Add material A dropwise for 2 hours, add material B dropwise for 2.5 hours, and keep warm for 1 hour; add sodium hydroxide soluti...

example 2

[0023] Dissolve 6g of acrylic acid and 15g of hydroxypropyl acrylate in deionized water to make dripping solution A for later use; dissolve 1.5g of chain transfer agent hypophosphite and VC0.6g of initiation aid in deionized water to make dropping solution B The material is set aside, and the initiator hydrogen peroxide (30%) 2.8g is dissolved in water to make C material and set aside. Add 170g of isopentenyl polyoxyethylene ether (TPEG) and 120g of deionized water into a 500ml container and stir to dissolve it. After fully dissolving, add 5.3g of maleic anhydride and stir. After the dissolution, the dropwise addition temperature is 25- 30°C, add chain transfer agent and stir for 10 minutes, then add initiator material C and stir for 10 minutes, and at the same time, add material A and material B dropwise into the bottom liquid at a constant speed. Add material A dropwise for 3 hours, add material B dropwise for 3.5 hours, and keep warm for 1 hour; add sodium hydroxide solutio...

example 3

[0025] Dissolve 4.5g of acrylic acid, 8.6g of hydroxyethyl acrylate, and 3.8g of hydroxypropyl acrylate in deionized water to prepare dropwise liquid A for later use. Dissolve 1.2g of chain transfer agent hypophosphite and 0.85g of initiation aid VC in Deionized water is prepared as material B for dropwise addition, and 3.2 g of initiator hydrogen peroxide (30%) is dissolved in water to form material C for later use. Add 165g of isopentenyl polyoxyethylene ether (TPEG) and 115g of deionized water into a 500ml container and stir to dissolve it. After fully dissolving, add 4.5g of maleic anhydride and stir. After the dissolution, the dropwise addition temperature is 25- 30°C, add chain transfer agent and stir for 10 minutes, then add initiator material C and stir for 10 minutes, and at the same time, add material A and material B dropwise into the bottom liquid at a constant speed. Add material A dropwise for 2.5 hours, add material B dropwise for 3.0 hours, and keep warm for 1....

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Abstract

The invention discloses an anti-mud polycarboxylic acid slump retaining agent. The slump retaining agent is prepared from the following raw materials by weight percent: 50-75% of unsaturated polyoxyethylene ether monomer, 4-8% of acrylic acid, 6-12% of maleic anhydride, 11-20% of hydroxyethyl acrylate or hydroxypropyl acrylate, 0.5-3.0% of chain transfer agents, 0.1-5% of initiators and 0.01-2% of initiating additives. The invention also discloses a preparation method of the slump retaining agent. The preparation method comprises the following steps: dropwise adding a solution of acrylic acid, hydroxyethyl acrylate and hydroxypropyl acrylate and dropwise adding the initiating additives for 2-3.5 hours, and adding a sodium hydroxide solution to regulate the pH value to 6-7 after insulating for 1-1.5 hours, thus obtaining the anti-mud polycarboxylic acid slump retaining agent with solid content of 40-45%. The slump retaining agent has an obvious anti-mud effect in concrete and has an excellent slump retaining capacity.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to the preparation and method of a mud-resistant polycarboxylate slump retaining agent. technical background [0002] Since polycarboxylate superplasticizers began to be used in China, their development has been very rapid. In particular, polycarboxylate superplasticizer is designated as a special concrete admixture for railway engineering, which greatly promotes the promotion and application of polycarboxylate superplasticizer. Compared with traditional water reducers, polycarboxylate water reducers have more advantages, such as low dosage, high water reducing rate, and better adaptability. However, in the actual engineering application process, the existing polycarboxylate water reducers show some problems. Mainly due to fluctuations in the quality of concrete raw materials, such as changes in cement, mud content in sand and gravel, etc., the working performance of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F222/06C08K3/32C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08K3/32C08F220/281
Inventor 刘成舟陈娟李本秀陈凯穆黔
Owner GUIZHOU TIEJIANHENGFA NEW MATERIAL TECH CO LTD
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