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A method for preparing star polycarboxylate water reducer

A technology of polycarboxylate-based water-reducer, applied in the field of polycarboxylate-based water-reducer for cement concrete, to achieve the effect of high yield, simple operation and rapid response

Active Publication Date: 2018-03-13
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no one in China has proposed to prepare a star-shaped multi-armed comb polycarboxylate superplasticizer with narrow distribution of polymerization products and controllable molecular weight and structure under the action of RAFT chain transfer agent and initiator.

Method used

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  • A method for preparing star polycarboxylate water reducer
  • A method for preparing star polycarboxylate water reducer
  • A method for preparing star polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of star-shaped RAFT chain transfer agent: 1mol 3-methyl-1,3,5-pentanetriol, 3mol dodecyltrithioisobutyric acid and 0.03mol DMAP were subjected to esterification reaction at 0°C 10h obtains RAFT chain transfer agent;

[0028] 2) Preparation of star polycarboxylate superplasticizer: 0.1mol of RAFT chain transfer agent obtained in step 1), 10mol of acrylic acid, 20mol of methallyl polyethylene glycol (300g / mol) and 0.01mol of azobis React isobutyronitrile (AIBN) at 60°C for 3 hours, and add sodium hydroxide to adjust the pH to 7 to obtain a star-shaped polycarboxylate water reducer.

Embodiment 2

[0030] 1) Preparation of star-shaped RAFT chain transfer agent: 1mol 1,2,5-pentanetriol, 3.1mol 4-cyano-4-(dodecylsulfanylthiocarbonyl)sulfanylvaleric acid and 0.04mol DCC-DMAP (the molar ratio of EDC to DMAP is 1:1) was esterified at 25°C for 12 hours to obtain RAFT chain transfer agent;

[0031]2) Preparation of star polycarboxylate superplasticizer: RAFT chain transfer agent obtained in 0.1mol step 1), 10mol maleic anhydride, 30mol allyl polyethylene glycol (500g / mol) and 0.02mol diperoxide Benzoyl (BPO) was reacted at 80°C for 3 hours, and potassium hydroxide was added to adjust the pH value to 7 to obtain a star polycarboxylate superplasticizer.

Embodiment 3

[0033] 1) Preparation of star-shaped RAFT chain transfer agent: 1mol 1,2,3-pentanetriol, 3.01mol dithiobenzoic acid and 0.05mol EDC-DMAP (the molar ratio of EDC to DMAP is 1:1) were mixed at 20 The esterification reaction was carried out at ℃ for 17h to obtain the RAFT chain transfer agent;

[0034] 2) Preparation of star polycarboxylate superplasticizer: RAFT chain transfer agent obtained in 0.1mol step 1), 30mol fumaric acid, 30mol 3-methyl-3-butene-1-polyethylene glycol (1000g / mol) and 0.02mol potassium persulfate (K 2 S 2 0 8 ) at 60°C for 4 hours, and then add sodium hydroxide to adjust the pH to 6 to obtain a star-shaped polycarboxylate superplasticizer.

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Abstract

The invention discloses a method for preparing a star polycarboxylate water reducing agent. The method comprises the following specific steps: performing an esterification reaction between polyalcoholic hydroxyl-containing organic molecules and a carboxyl-containing chain transfer agent under the effect of a catalyst to obtain a star RAFT chain transfer agent; enabling the star RAFT chain transfer agent, an unsaturated acid small monomer, an unsaturated macromonomer and an initiator to react for 3-5h at 60-90 DEG C; and adding alkali to adjust the pH value to 6-7 to obtain the star polycarboxylate water reducing agent. According to the method disclosed by the invention, the product performance is adjusted by controlling the temperature, monomer proportion and molecular weight of the macromonomer, the reaction is quick, the efficiency is high, and the operation is simple. The polycarboxylate water reducing agent prepared by the method is a functional polycarboxylate high-efficiency water reducing agent, and the product performance is stable.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water-reducer for cement concrete, in particular to a method for preparing a star-shaped polycarboxylate water-reducer. Background technique [0002] Polycarboxylate high-performance water reducer (PCE) is a comb-shaped water-soluble polymer with aliphatic linear main chain connected to multiple polyoxyethylene / polyoxypropylene branch chains containing hydrophilic functional groups such as carboxylic acid groups. polymer. Because PCE has the advantages of environmental protection, superior performance, designability of molecular structure and performance, multi-functional serialization of products, etc., it is an important basic material and key technology for the preparation of high-performance concrete, which is important for ensuring the quality and quality of large-scale important infrastructure projects in my country Improving the service life is of great significance, represents th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F290/06C08F220/06C08F222/06C08F220/02C08F228/02C08F212/14C08F220/58C08F2/38C04B24/32
CPCC04B24/32C04B2103/302C08F2/38C08F283/065C08F290/062C08F2438/03C08F220/06C08F228/02C08F212/14C08F220/585
Inventor 钱珊珊张岭丁蓓王毅姜海东郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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