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Preparation method of novel concrete slump retaining agent based on allyl polyoxyethylene ether

A technology of allyl polyoxyethylene ether and slump-retaining agent, applied in the polymer field, can solve problems such as insufficient slump-retaining performance of concrete, and achieve the effects of simple production process, wide source of raw materials and low cost

Active Publication Date: 2014-05-14
BEIJING ACAD OF BUILDING ENG
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  • Application Information

AI Technical Summary

Problems solved by technology

This method uses allyl polyoxyethylene ether and its derivatives from a wide range of sources and low price as raw materials, and through a relatively simple production process, a new type of concrete slump retaining agent with good slump retention ability is obtained, thereby effectively solving the current common problems. Insufficient slump performance of concrete with polycarboxylate superplasticizer

Method used

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  • Preparation method of novel concrete slump retaining agent based on allyl polyoxyethylene ether
  • Preparation method of novel concrete slump retaining agent based on allyl polyoxyethylene ether
  • Preparation method of novel concrete slump retaining agent based on allyl polyoxyethylene ether

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Embodiment 1

[0026] In a 1L glass flask, add 220g of deionized water, 240g of allyl polyoxyethylene ether APEG-2400 (molecular weight 2400), 120g of allyl polyoxyethylene ether sulfonate ammonium ASPEG-1200 (molecular weight of 1200), and mix well. Turn on the stirring and raise the temperature to 85°C. Start to drop the monomer solution (composition: 45g acrylic acid + 180g deionized water) and initiator solution (composition: 4g sodium persulfate + 220g deionized water) respectively, and drop them evenly within 3 hours. After holding at 85°C for 1 hour, the temperature of the solution was lowered to 40-50°C. Add 32% NaOH, adjust the system to pH 5.8-6.2, and prepare a new type of slump-retaining agent SP-A with a weight-average molecular weight of 35,000 and a solid content of 40%.

Embodiment 2

[0028] In a 1L glass flask, add 220g deionized water, 240g allyl polyoxyethylene ether APEG-2400 (molecular weight 2400), 120g allyl polyoxyethylene ether monophosphonic acid disodium APPPEG-1200 (molecular weight 1200), mix uniform. Turn on the stirring and raise the temperature to 85°C. Start to add monomer solution (composition: 45g acrylic acid + 180g deionized water) and initiator solution (composition: 4g sodium persulfate + 220g deionized water) dropwise respectively, and drop them uniformly within 3 hours. After holding at 85°C for 1 hour, the temperature of the solution was lowered to 40-50°C. Add 32% NaOH, adjust the system to pH 5.8-6.2, and prepare a new type of slump-retaining agent SP-B with a weight-average molecular weight of 38,000 and a solid content of 40%.

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Abstract

The invention discloses a preparation method of a novel concrete slump retaining agent based on allyl polyoxyethylene ether. The method comprises the following steps: with the allyl polyoxyethylene ether, end group modified allyl polyoxyethylene ether and unsaturated carboxylic acid as main raw materials, reacting by adopting an aqueous polymerization process in the presence of an aid, and neutralizing until the pH value is proper so as to obtain the slump retaining agent with proper weight-average molecular weight. According to the method, the wide-source and low-price allyl polyoxyethylene ether and derivatives of the allyl polyoxyethylene ether are adopted as raw materials, and the novel concrete slump retaining agent with good slump retaining capability is obtained through a relatively simple and convenient production process.

Description

technical field [0001] The invention relates to a preparation method of a novel concrete slump-retaining agent based on allyl polyoxyethylene ether, which is suitable for compounding with common polycarboxylate water-reducing agents and belongs to the technical field of macromolecules. technical background [0002] In the past 10 years, high-performance concrete water-reducers represented by polycarboxylate-based water-reducers have been widely used in key projects such as high-speed rail, municipal engineering, and water conservancy construction, and have become the key direction and direction of water-reducer development in the future. hot frontier. [0003] At present, the polycarboxylate superplasticizer products on the market mainly have the problem that the fluidity of fresh concrete is lost too quickly, that is, the product has insufficient slump retention. The common solutions are: 1. Select a new type of highly active unsaturated monomer, such as isopentenyl polyox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F222/06C04B24/26
Inventor 王万金贺奎孔韬李晓飞张乐
Owner BEIJING ACAD OF BUILDING ENG
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