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Preparation method of air entraining agent

A technology of air-entraining agent and initiator, which is applied in the field of air-entraining agent preparation and can solve the problems of poor foam stabilization effect of air-entraining agent

Pending Publication Date: 2021-07-30
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides a preparation method of an air-entraining agent to solve the problem in the prior art that the air-entraining agent has a poor foam stabilizing effect and needs to add more air-entraining agents to improve the workability of concrete

Method used

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  • Preparation method of air entraining agent
  • Preparation method of air entraining agent
  • Preparation method of air entraining agent

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: the preparation method of this air-entraining agent is carried out according to the following steps:

[0028] Step 1: Under stirring, add 18 parts of 4-n-nonylphenol and 0.04 parts of sodium hydroxide to the reaction kettle A equipped with a self-made multi-blade stirring paddle, heat up to 70°C, and then vacuumize and stir for 30-90 minutes. The distance between the self-made multi-blade stirring paddle and the bottom of the reactor is 20mm, and the inner diameter of the reactor is 200mm;

[0029] Step 2: Put 90.6 parts of ethylene oxide into reactor B, and drop 1 part of ethylene oxide from reactor B into reactor A;

[0030] Step 3: Raise the temperature of reactor A to 120°C, and maintain the system pressure at 0.2MPa;

[0031] Step 4: Slowly add the remaining ethylene oxide in the reactor B to the reactor A dropwise, the total dropping time is controlled at 4h, and the intermediate A is obtained;

[0032] Step 5: Add 10 parts of Intermediate A, 1 par...

Embodiment 2

[0034] Example 2: The difference between this embodiment and Example 1 is that in step 1, 4-n-nonylphenol is 22 parts.

Embodiment 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: the total dropwise addition time of ethylene oxide in step 4 is 5h.

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Abstract

The invention relates to the technical field of composite material preparation, and particularly discloses a preparation method of an air entraining agent, and the preparation method of the air entraining agent comprises the following steps: in a stirring state, adding an initiator and sodium hydroxide into a reaction kettle A, conducting heating to 65-75 DEG C, conducting vacuumizing and stirring for 30-90 minutes, putting ethylene oxide into a reaction kettle B, dropwise adding ethylene oxide into the reaction kettle A from the reaction kettle B, heating the reaction kettle A to 120-130 DEG C, and maintaining the system pressure of the reaction kettle A in a medium-pressure environment; slowly dropwise adding the residual ethylene oxide in the reaction kettle B into the reaction kettle A to obtain an intermediate A; adding the intermediate A, phosphoric acid and a cosolvent into a cleaned reaction kettle A, conducting heating to 120-130 DEG C, and conducting stirring for 15-18 hours; and conducting cooling, concentrating and cleaning to obtain the air entraining agent. The invention aims to solve the problems that in the prior art, an air entraining agent is poor in foam stabilizing effect, and more air entraining agents need to be added to improve the workability of concrete.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method of an air-entraining agent. Background technique [0002] Air-entraining agent is the earliest admixture used in concrete. As early as the construction period of the Great Wall of Qin Dynasty, the ancient Chinese had already used it in it. With the progress of the times and the development of science and technology, air-entraining agents are gradually used in water conservancy, ports, high-speed rail, bridges and other fields. The air-entraining agent is an admixture that can introduce a large number of uniform micro-bubbles during the mixing process of the concrete mixture. The stability and quantity of the introduced air bubbles are two important indicators to measure the air-entraining agent. It is of great significance to the development of my country's construction industry to develop new high-performance air-entraining agents and...

Claims

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Application Information

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IPC IPC(8): C08G65/28C08G65/327C04B24/28C04B103/30
CPCC08G65/2612C08G65/327C04B24/243C04B2103/304
Inventor 高宗鸿邓妮陈杰方世昌田应兵
Owner GUIZHOU DR SHI TECH
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