Preparation method of slow-release solid polycarboxylic acid water reducing agent

A polycarboxylic acid, slow-release technology, applied in the field of polycarboxylic acid-based water-reducing agents, can solve the problems of difficulty in meeting the requirements of long-distance transportation of ready-mixed concrete, slump loss, and the lack of slow-release properties of water-reducing agents. , to achieve the effect of excellent water reduction and dispersion effect, stable state and excellent performance indicators

Inactive Publication Date: 2015-05-20
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

However, the synthesized solid polycarboxylate high-performance water reducer has no slow-release performance, and the slump of...

Method used

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  • Preparation method of slow-release solid polycarboxylic acid water reducing agent
  • Preparation method of slow-release solid polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step (1) Pretreatment of acrylic small monomers with unsaturated double bonds: Stir 1 mol of acrylic acid and 0.3 mol of ethylenediamine for 1 hour without heat source;

[0023] (2) Preparation of slow-release solid polycarboxylate water reducer: 0.31 mol of acrylic acid pretreated in the above step (1) and 1 mol of allyl polyoxyethylene ether with a molecular weight of 1400 are heated to 65 ° C in a kettle, and the Allyl polyoxyethylene ether is in a liquid state. Add 0.01mol of azobisisoheptanonitrile and 0.5mol of mercaptoacetic acid to the kettle, then dropwise add 3mol of hydroxypropyl acrylate to react for 2 hours and keep it warm for 3 hours. The copolymerization product is obtained through bulk polymerization in a certain environment, and becomes a solid polycarboxylate water reducer after cooling.

Embodiment 2

[0025] Step (1) Pretreatment of acrylic small monomers with unsaturated double bonds: Stir 1 mol of methacrylic acid and 0.8 mol of triethylamine for 2 hours without heat source;

[0026] (2) Preparation of slow-release solid polycarboxylate water reducer: 1 mol of methacrylic acid pretreated in the above step (1) and 1 mol of isopentenyl polyoxyethylene ether with a molecular weight of 2400 are heated to 70°C in a kettle , when the isopentenyl polyoxyethylene ether is liquid, add 0.05mol of azobisisobutyronitrile and 0.8mol of 2-mercaptopropionic acid to the kettle, then dropwise add 4mol of hydroxyethyl acrylate to react for 3h and keep warm for 2h. The reaction process is The copolymerization product is obtained through bulk polymerization in an environment without water and organic solvents, and becomes a solid polycarboxylate water reducer after cooling.

Embodiment 3

[0028] Step (1) pretreatment of acrylic small monomers with unsaturated double bonds: stirring 1 mol of maleic acid and 0.6 mol of cyclohexylamine for 3 hours without heat source;

[0029] (2) Preparation of slow-release solid polycarboxylate water reducer: 2.3 mol of maleic acid pretreated in the above step (1) and 1 mol of isopentenyl polyoxyethylene ether with a molecular weight of 2900 are heated to 75 ℃, when the isopentenyl polyoxyethylene ether is in liquid state, add 0.1 mol of azobisisoheptanonitrile and 1 mol of sodium methacrylsulfonate to the kettle, then add 5 mol of butyl acrylate dropwise to react for 3 hours and keep it warm for 2 hours. The copolymerization product is obtained through bulk polymerization in an environment without water and organic solvents, and becomes a solid polycarboxylate water reducer after cooling.

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Abstract

The invention relates to a preparation method of a slow-release solid polycarboxylic acid water reducing agent, which comprises the following steps: pretreating carboxylic acid small monomer containing unsaturated double bond by using amine organic small molecule; and after heating to melt the pretreated unsaturated acrylic small monomer and unsaturated polyethenoxy ether big monomer, dropwisely adding unsaturated ester small monomer to perform mass polymerization reaction under the action of an initiator and a chain-transfer agent in a water-free organic-solvent-free environment. The slow-release solid polycarboxylic acid water reducing agent prepared by the mass polymerization process in the water-free solvent-free environment has the advantages of simple and controllable technique, transportation cost saving, environment friendliness, no pollution and the like, achieves the goal of slow release and keeping the slump for 3-4 hours without loss in concrete, and has wide market application prospects.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water reducer for cement concrete, in particular to a slow-release solid polycarboxylate water reducer synthesized by bulk polymerization in an anhydrous and organic solvent-free environment. Preparation. Background technique [0002] The synthesis of traditional polycarboxylic acid-based water reducers is formed by free radical polymerization in aqueous solution. Heat transfer is easy in aqueous media, and the polymerization exotherm is highly controllable. It can be polymerized at room temperature. The solid content of the mother liquor product At around 40%, this creates a big cost problem for long-distance transportation. At present, the preparation of powder polycarboxylate water-reducer on the market is through solution polymerization, and the product is spray-dried. The technology is not perfect, and the drying process consumes a lot of energy, and the effective components of the...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F222/02C08F220/18C08F228/02C08F290/06C08F220/56C08F222/14C04B24/26C04B103/30
Inventor 仇影丁蓓
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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