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Reactive extrusion preparation method of ultra-slow-release solid polycarboxylate water reducer

A reactive extrusion, polycarboxylic acid-based technology, applied in the reactive extrusion preparation of ultra-sustained-release solid polycarboxylic acid-based water-reducing agents, and the field of ultra-sustained-release solid polycarboxylic acid-based water-reducing agents, can solve the problem. Complex process, high temperature problems, to achieve the effect of no solvent poisoning, performance is not affected, the preparation process is safe and environmentally friendly

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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  • Reactive extrusion preparation method of ultra-slow-release solid polycarboxylate water reducer
  • Reactive extrusion preparation method of ultra-slow-release solid polycarboxylate water reducer
  • Reactive extrusion preparation method of ultra-slow-release solid polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) 873.4kg isopentenol polyoxyethylene ether (molecular weight 4000) is dropped into melting and mixing tank and heated and melted, then add 26.5kg acrylic acid, 79.8kg hydroxypropyl acrylate and 4.80kg octyl thioglycolate and mix uniformly;

[0032] (2) The blend obtained in step (1) is extruded through a twin-screw extruder, while adding 2.25kg of benzoyl peroxide at the first feeding port, and adding 2.25kg of benzoyl peroxide at the second feeding port after 3min. Benzoyl, the temperature of the screw extruder is maintained at 75°C, and the residence time of the material in the screw barrel is 7 to 10 minutes;

[0033] (3) After 6 minutes, add 11.0kg powder alkali at the third feeding port, and the finished product is discharged after being crushed by the cryogenic pulverizer through the discharge port.

Embodiment 2

[0035] (1) 817.8kg isopentenol polyoxyethylene ether (molecular weight 2400) is dropped into melting and mixing tank and heated and melted, then add 58.6kg methacrylic acid, 98.6kg hydroxypropyl acrylate and 4.90kg octyl mercaptan and mix evenly;

[0036] (2) Extrude the blend obtained in step (1) through a twin-screw extruder, and simultaneously add 1.95 kg of azobisisobutyronitrile at the first feeding port, and add 1.95 kg of azobisisobutyronitrile at the second feeding port after 3 minutes. Nitrogen diisobutyronitrile, the temperature of the screw extruder is maintained at 75°C, and the residence time of the material in the screw barrel is 7 to 10 minutes;

[0037] (3) After 6min, add 16.2kg powder alkali at the third feeding port, and the finished product is discharged after being crushed by the cryogenic pulverizer through the discharge port.

Embodiment 3

[0039] (1) 742.9kg of prenyl alcohol polyoxyethylene ether (molecular weight 2400) is dropped into a melting mixing tank and heated and melted, then 66.8kg of acrylic acid, 165.8kg of hydroxyethyl acrylate and 4.80kg of cetyl mercaptan are added and mixed uniformly;

[0040] (2) The blend obtained in step (1) is extruded through a twin-screw extruder, while adding 1.9kg of benzoyl peroxide at the first feeding port, and adding 1.9kg of benzoyl peroxide at the second feeding port after 3min. Benzoyl, the temperature of the screw extruder is maintained at 75°C, and the residence time of the material in the screw barrel is 7 to 10 minutes;

[0041] (3) After 6min, add 15.9kg powder alkali at the third feeding port, and the finished product is discharged after being crushed by the cryogenic pulverizer through the discharge port.

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Abstract

A reactive extrusion preparation method of an ultra-slow-release solid polycarboxylate water reducer comprises the following steps: putting isopentenol polyoxyethylene ether into a melting mixing tank, conducting heating for melting, adding unsaturated carboxylic acid, acrylate and a chain transfer agent, and conducting uniform stirring and mixing; extruding the blend through a double-screw extruder, adding half of an initiator into a first feeding hole, adding the rest half of the initiator into a second feeding hole after 3 minutes, keeping the temperature of the screw extruder at 75 DEG C,and keeping the material in a screw cylinder for 7-10 minutes; and after 6 min, adding a powdery alkali into a third feeding port, and discharging a finished product after the finished product is crushed in a cryogenic crusher through a discharging port. The reactive extrusion method is adopted for bulk synthesis, the solid polycarboxylate water reducer with the solid content reaching 98% or abovecan be prepared, and the prepared ultra-slow-release solid polycarboxylate water reducer is basically consistent with similar products synthesized through a traditional 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 an ultra-slow-release solid polycarboxylate water-reducer and a reactive extrusion preparation method for the ultra-slow-release solid polycarboxylate water-reducer . 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 reducers, polycarboxylate water reducers 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 market are 30-50% liquid products...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F222/06C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F220/20C08F222/06
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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