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Preparation method of poly carboxylic acid water reducing agent with regular sequence structure

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of fast slump loss, poor cement adaptability, insufficient water reducing effect, etc., and achieve the effects of low cost and simple preparation process

Active Publication Date: 2018-05-22
JIANGSU SOBUTE NEW MATERIALS +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problems of insufficient water-reducing effect, rapid slump loss and poor cement adaptability of the existing polycarboxylate water-reducer with random structure, and provides a preparation method of polycarboxylate high-performance water-reducer with regular sequence structure, The produced product has the advantages of low dosage, high water reducing rate, small slump loss, strong adaptability, etc., and the preparation process is simple and the production cost is low

Method used

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  • Preparation method of poly carboxylic acid water reducing agent with regular sequence structure
  • Preparation method of poly carboxylic acid water reducing agent with regular sequence structure
  • Preparation method of poly carboxylic acid water reducing agent with regular sequence structure

Examples

Experimental program
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Effect test

Embodiment 1

[0033]Add 100g of A-1 and 17.82g of B-1 to a flask equipped with a stirrer, carry out Michael addition reaction at 10°C for 5h, then cool down to 0°C, slowly add 18.1g of acryloyl chloride dropwise, dropwise After 30min finishes, continue to react at room temperature for 12h; Continue to drop into small molecule RAFT reagent BDMAT1.18g, initiator potassium persulfate 0.36g and water 320g in the flask, this moment polymerization concentration is 30%, in N 2 Under the atmosphere, the temperature was raised to 60°C, and after 2 hours of reaction, a polycarboxylate superplasticizer with a regular sequence structure was obtained, with a weight-average molecular weight of 25,300.

Embodiment 2

[0035] Add 187.5g of A-2 and 30.93g of B-2 to a flask equipped with a stirrer, perform Michael addition reaction at 30°C for 7 hours, then cool down to 0°C, slowly add 27.15g of acryloyl chloride dropwise, dropwise After adding 30min, continue the reaction at room temperature for 12h; continue to drop into the flask 0.92g of small molecule RAFT reagent BDMAT, 0.14g of initiator ammonium persulfate and 250g of water. At this time, the polymerization concentration is 50%. 2 Under the atmosphere, the temperature was raised to 70°C, and after 3 hours of reaction, a polycarboxylate water reducer with a regular sequence structure was obtained, with a weight average molecular weight of 37,600.

Embodiment 3

[0037] Add 165g of A-3 and 39.83g of B-3 into a flask equipped with a stirrer, perform Michael addition reaction at 50°C for 12h, then cool down to 0°C, slowly add 15.08g of acryloyl chloride dropwise, dropwise After 30min, continue to react at room temperature for 12h; continue to drop into the flask 1.01g of small molecule RAFT reagent CETPA, 0.23g of initiator V-50 and 330g of water. At this time, the polymerization concentration is 40%. 2 Under the atmosphere, the temperature was raised to 80°C, and after 5 hours of reaction, a polycarboxylate water reducer with a regular sequence structure was obtained, with a weight average molecular weight of 52,300.

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Abstract

The invention discloses a preparation method of a poly carboxylic acid water reducing agent with a regular sequence structure. The preparation method comprises the following steps of performing Michael addition reaction on a polyethylene glycol ester acrylate macromer A and amino group containing carboxylic acid B for 5-12h, then cooling the temperature to 0 DEG C, dropwise adding acryloyl chloride slowly at a constant speed, and continuously performing reaction for 12h under the condition with normal temperature after dropwise addition is finished to obtain a carboxyl group containing polyether macromer C; and fully mixing the carboxyl group containing polyether macromer C, a small molecular RAFT reagent, an initiator and water, keeping the polymerization mass concentration be 30-60 percent, rising the temperature to 60-80 DEG C at the atmosphere of N2, and performing reaction for 2-5h to obtain the poly carboxylic acid water reducing agent with the regular sequence structure. The poly carboxylic acid water reducing agent prepared by the preparation method is suitable for regions with high mud content of sandstone aggregates and has the advantages of low mixing amount, high waterreducing ability and high slump loss resistance. The preparation method provided by the invention is simple in preparation technology as well as is environmentally friendly and is low in cost in the production process.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer with a regular sequence structure and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] In recent years, with the development of concrete technology, the application of polycarboxylate high-performance water reducing agent has been popularized. With its advantages of low dosage, high water reducing rate, excellent slump performance, low shrinkage, energy saving and environmental protection, etc., it is gradually being used in It has been widely used in many projects. However, in actual engineering use, polycarboxylate superplasticizers often have adaptability problems with cement and mineral admixtures (fly ash, mineral powder, etc.). At the same time, due to the shortage of resources, a large number of projects use machine-made sand instead of natural river sand, causing new adaptability problems between polycarboxylate superpla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC04B24/2658C08F283/06C04B2103/302C08F2438/03C08F220/06C04B2103/30C04B2103/32C04B24/2647C04B28/02C08F299/024C08K5/39
Inventor 翟树英杨勇周栋梁舒鑫冉千平严涵赵红霞
Owner JIANGSU SOBUTE NEW MATERIALS
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