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Solvent-free low-temperature ball-milling preparation method of solid polycarboxylic slump retaining agent

A technology of polycarboxylic acid-based and slump-retaining agent is applied in the field of solvent-free low-temperature ball milling preparation of solid polycarboxylic acid-based slump-retaining agent and solid polycarboxylic acid-based slump-retaining agent, which can solve the problems of high temperature and complicated process, etc. Achieve the effect of unaffected performance, no solvent poisoning, and reduced production costs

Pending Publication Date: 2020-12-04
安徽瑞和新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the defects of high temperature and complicated process

Method used

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  • Solvent-free low-temperature ball-milling preparation method of solid polycarboxylic slump retaining agent
  • Solvent-free low-temperature ball-milling preparation method of solid polycarboxylic slump retaining agent
  • Solvent-free low-temperature ball-milling preparation method of solid polycarboxylic slump retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 17.0kg of molten ethylene glycol vinyl polyoxyethylene ether (molecular weight 3000), 0.2kg of acrylamide, 0.6 kg of acrylic acid, 1.9kg of hydroxyethyl acrylate and 0.14kg of octyl 3-mercaptopropionate into the ball mill and close the lid, open Add 0.045kg of benzoyl peroxide to the initiator feed valve; then, while turning on the ball mill for ball milling, open the chilled water valve of the jacket of the ball mill, and control the temperature at 60±2°C; add the remaining 0.045kg of benzoyl peroxide after 5 minutes of ball milling Formyl, continue ball milling for 5 minutes, stop the machine and open the discharge valve, and the finished product is sent to the cryogenic pulverizer for pulverization and discharge.

Embodiment 2

[0032] Add 18.4kg molten ethylene glycol vinyl polyoxyethylene ether (molecular weight 6000), 0.1kg N-methylolacrylamide, 0.4kg methacrylic acid, 0.9kg hydroxyethyl acrylate and 0.10kg octyl mercaptan to the ball mill and Close the lid, open the feed valve of the initiator, and add 0.05kg of azobisisobutyronitrile; then, while turning on the ball mill for ball milling, open the chilled water valve of the jacket of the ball mill, and control the temperature at 60±2°C; add the remaining 0.05kg azobisisobutyronitrile, continue ball milling for 5 minutes, stop the machine and open the discharge valve, and the finished product is sent to the cryogenic pulverizer for pulverization and discharge.

Embodiment 3

[0034] Put 17.1kg of molten ethylene glycol vinyl polyoxyethylene ether (molecular weight 3000), 0.1kg of methacrylamide, 0.6kg of acrylic acid, 2.0kg of hydroxypropyl acrylate and 0.10kg of decyl mercaptan into the ball mill and close the lid, open and trigger Add 0.05kg of dimethyl azobisisobutyrate to the feeding valve of the agent; then, while turning on the ball mill for ball milling, open the chilled water valve of the jacket of the ball mill, and control the temperature at 60±2°C; add the remaining 0.05kg after 7 minutes of ball milling Dimethyl azobisisobutyrate, continue ball milling for 7 minutes, stop the machine and open the discharge valve, and the finished product is sent to the cryogenic pulverizer for pulverization and discharge.

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Abstract

The invention relates to a solvent-free low-temperature ball-milling preparation method of a solid polycarboxylic slump retaining agent, which comprises the following steps: adding molten ethylene glycol vinyl polyoxyethylene ether, unsaturated carboxylic acid, acrylate, unsaturated amide and a chain transfer agent into a ball mill, closing a cover, opening an initiator feed valve, and adding halfof an initiator; opening a jacket chilled water valve of the ball mill while starting the ball mill for ball milling, and controlling the temperature to be 60+ / -2 DEG C; adding the rest half of the initiator when ball milling is carried out for half of time, controlling the ball milling time to be 5-15 min, and after ball milling is finished, conveying a finished product to a cryogenic crusher through a discharging valve to crush and discharge the finished product. A solvent-free low-temperature ball milling method is adopted for bulk synthesis, the solid polycarboxylic acid slump retaining agent with the solid content reaching 98% or above can be prepared, and the prepared solid polycarboxylic acid slump retaining agent is basically consistent with similar products synthesized through atraditional intermittent kettle type aqueous solution method in performance.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a solid polycarboxylate-based slump-retaining agent and a solvent-free low-temperature ball-milling preparation method of the solid polycarboxylate-based slump-retaining agent. Background technique [0002] With the rise of my country's nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure, especially the large-scale implementation of the national railway passenger dedicated line network project, the market demand for polycarboxylate water reducers continues to grow. Compared with traditional high-efficiency water-reducing agents, polycarboxylate-based water-reducing agents have become the key materials for high-performance concrete due to their excellent properties such as high water-reducing rate, low slump loss, and low alkali content. [0003] Most of the polycarboxylate water reducers on the mark...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/56C08F220/58C08F220/54C08F222/02C08F220/06C08F220/20C08F220/14C08F2/00C04B24/26
CPCC08F283/065C08F2/00C04B24/2694C04B2103/308C08F220/56C08F220/06C08F220/20C08F220/58C08F220/54C08F222/02C08F220/14
Inventor 陈国新杜志芹温金保唐修生祝烨然卢建
Owner 安徽瑞和新材料有限公司
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