Preparation method of clay anti-sensitivity solid polycarboxylate superplasticizer

A clay anti-sensitivity and polycarboxylate technology, which is applied in the field of preparation of clay anti-sensitivity solid polycarboxylate superplasticizers, can solve the problems of inconvenient storage and transportation, high production energy consumption, and destruction of polycarboxylate superplasticizer molecules structural issues

Inactive Publication Date: 2020-10-23
北京水木佳维新材料技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, polycarboxylate superplasticizers with clay antisensitivity are mostly made by aqueous solution free radical polymerization, and most of them are solution products with a concentration of 10-50%, which is inconvenient for storage and transportation, especially in long-distance transportation, which will lead to significant transportation costs. Increase
However, traditional powder products made by spray drying consume a lot of energy in production, and are prone to partial crosslinking under high temperature conditions, destroying the original molecular structure of polycarboxylate superplasticizers, resulting in a decline in performance

Method used

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  • Preparation method of clay anti-sensitivity solid polycarboxylate superplasticizer

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Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of clay antisensitivity solid polycarboxylate water reducer, comprising the following steps:

[0030] Step 1: Add 240g prenyl polyoxyethylene ether (molecular weight 2400) and 1.2g polyethylene glycol 800 (PEG-800) into the reactor, heat up to 70°C, fully melt and stir for later use;

[0031] Step 2: Add 0.25 g of concentrated sulfuric acid, 5.3 g of 60% dimethyl diallyl ammonium chloride, and 0.5 g of azobisisobutylcyanide to the liquid obtained in step 1, and stir for 10 minutes to dissolve and mix;

[0032] Step 3: The reaction temperature is controlled at 70-75°C, and the mixture of 34.2g of acrylic acid, 6.5g of hydroxypropyl acrylate, 1.25g of azobisisobutylcyanide and 2.0g of mercaptoacetic acid is added dropwise at a constant speed to the liquid obtained in step 2, The dripping time is 3h respectively; after the dripping is finished, continue the insulation reaction for 1.5h;

[0033] Step 4: Add 5.0 g of triethanolamine to the liquid obtai...

Embodiment 2

[0035] A preparation method of clay antisensitivity solid polycarboxylate water reducer, comprising the following steps:

[0036] Step 1: Add 240g isopentenyl polyoxyethylene ether (molecular weight 2400), 2.0g fatty alcohol polyoxyethylene ether (Pingpingjia O-25) into the reaction kettle, heat up to 65°C, fully melt and stir for later use;

[0037] Step 2: Add 0.25 g of concentrated sulfuric acid, 5.2 g of 80% methacryloyloxyethyltrimethylammonium chloride, and 0.5 g of azobisisoheptylcyanide to the liquid obtained in step 1, and stir for 10 minutes to dissolve and mix;

[0038] Step 3: The reaction temperature is controlled at 60-65°C, and the mixture of 36g of acrylic acid, 9.3g of hydroxyethyl acrylate, 1.0g of azobisisoheptyl cyanide and 1.5g of mercaptopropionic acid is added dropwise at a constant speed to the liquid obtained in step 2, The dripping time is 3.5h respectively, and after the dripping is finished, the insulation reaction is continued for 1.5h;

[0039] S...

Embodiment 3

[0041] A preparation method of clay antisensitivity solid polycarboxylate water reducer, comprising the following steps:

[0042] Step 1: Add 300g isopentenyl polyoxyethylene ether (molecular weight 3000) and 2.5g alkylphenol polyoxyethylene ether (OP-10) into the reaction kettle, heat up to 75°C, fully melt and stir for later use;

[0043] Step 2: Add 0.3 g of concentrated sulfuric acid, 8.25 g of 75% (3-acrylamidopropyl) trimethylammonium chloride, and 0.6 g of dimethyl azobisisobutyrate to the liquid obtained in step 1, and stir for 5 minutes to make it well mixed;

[0044] Step 3: Control the reaction temperature at 75-80°C, and add 39.6g of acrylic acid, 9.1g of hydroxypropyl acrylate, 1.2g of dimethyl azobisisobutyrate and 2.5g of mercapto to the liquid obtained in step 2. For the mixed solution of propionic acid, the dropwise addition time is 3h; after the dropwise addition, continue the heat preservation reaction for 1h;

[0045] Step 4: Add 8.5 g of triethanolamine ...

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Abstract

The invention discloses a preparation method of a clay anti-sensitivity solid polycarboxylate superplasticizer. The solid polycarboxylate superplasticizer is prepared by subjecting an unsaturated polyoxyethylene ether macromonomer a, an unsaturated carboxylic acid monomer b, an unsaturated alkyl ester monomer c and an unsaturated cationic monomer d according to a molar ratio of 1:(3.5-6.0):(0.5-1.0):(0.1-0.5) to solvent-free bulk polymerization under the action of an organic initiator and a chain transfer agent, and slicing by a condensation slicer. No volatile solvent is used in the production process; the process is simple, the prepared clay anti-sensitivity solid polycarboxylate superplasticizer has the advantages of being high in purity, good in solubility, low in clay sensitivity andthe like, the adverse effect of clay components in high-mud-content sandstone aggregate on the performance of the polycarboxylate superplasticizer is effectively reduced, meanwhile, due to the solid characteristic of the polycarboxylate superplasticizer, the packaging and transportation cost is greatly reduced, and a good application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a clay antisensitivity solid polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is a new generation of high-performance superplasticizer after lignosulfonate superplasticizer and naphthalene-based high-efficiency superplasticizer. It has the advantages of adjustable structure, green and environmental protection, and has been widely used in concrete. However, in recent years, the shortage of sand and gravel resources, the quality deterioration, the high mud content of natural sand and the silt content of machine-made sand have seriously affected the quality of concrete, especially the dispersibility and slump retention of traditional polycarboxylate water reducers due to the content of montmorillonite It has a great impact. The workability of freshly mixed concrete is greatly reduced, the l...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F226/04C08F220/06C08F220/20C08F220/34C08F220/60C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302
Inventor 徐忠洲
Owner 北京水木佳维新材料技术研究院有限公司
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