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Powdery polycarboxylic acid type slump retaining agent and preparation method thereof

A technology of polycarboxylate and slump-retaining agent, which is applied in the field of concrete admixture, can solve problems such as high temperature and complex process, and achieve the effects of unaffected performance, no solvent poisoning, and reduced production costs

Inactive Publication Date: 2017-06-23
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods have defects of high temperature or complex process

Method used

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  • Powdery polycarboxylic acid type slump retaining agent and preparation method thereof
  • Powdery polycarboxylic acid type slump retaining agent and preparation method thereof
  • Powdery polycarboxylic acid type slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of ester monomers: add 312.8kg methacrylic acid, 94.0kg ethylene glycol, 8.1kg sulfamic acid to the reaction kettle equipped with thermometer, stirring paddle, constant flow pump, condenser and water separator and 2.0kg of hydroquinone, heat up to 110-120°C under stirring, stir and reflux for 3-3.5 hours, separate the water layer with a water separator and lower the temperature to 60-70°C;

[0035] (2) Preparation of molten polycarboxylic acid series slump-retaining agent: add 4168kg isopentenol polyoxyethylene ether (molecular weight 2400), stir and melt, then add 29.2kg benzoyl peroxide and stir to dissolve; then 19.5kg over Sodium sulfate, 38.9kg of octyl thioglycolate, 86.8kg of ethyl acrylate and 187.6kg of acrylic acid were mixed into a mixed solution, which was dripped with a constant-flow pump within 3.5-4 hours; Stir 53.1kg powder alkali evenly;

[0036] (3) Preparation of powdered polycarboxylate-based slump-retaining agent: the melted product...

Embodiment 2

[0038] (1) Preparation of ester monomers: add 417.8kg methacrylic acid, 125.5kg ethylene glycol, 10.9kg sulfamic acid to the reaction kettle equipped with thermometer, stirring paddle, constant flow pump, condenser and water separator and 2.7kg of hydroquinone, heat up to 110-120°C under stirring, stir and reflux for 3-3.5 hours, separate the water layer with a water separator and cool down to 60-70°C;

[0039] (2) Preparation of molten polycarboxylic acid series slump-retaining agent: add 3712kg isopentenol polyoxyethylene polyoxypropylene ether (molecular weight 1600), stir and melt, then add 29.0kg azobisisoheptanonitrile and stir to dissolve; then Mix 19.2kg of ammonium persulfate, 33.9kg of butanethiol, 269.1kg of hydroxyethyl acrylate and 299.2kg of methacrylic acid into a mixed solution, and drop it with a constant-current pump within 2.5 to 3 hours; continue to keep warm for 4 hours after dropping, Add 80.9kg powder alkali and stir evenly;

[0040] (3) Preparation of ...

Embodiment 3

[0042] (1) Preparation of ester monomers: add 707.0kg methacrylic acid, 212.4kg ethylene glycol, 18.4kg sulfamic acid to the reaction kettle equipped with thermometer, stirring paddle, constant flow pump, condenser and water separator and 4.6kg of hydroquinone, heated up to 100-110°C under stirring, stirred and refluxed for 4-5 hours, separated the water layer with a water separator and lowered the temperature to 60-70°C;

[0043] (2) Preparation of molten polycarboxylate slump-retaining agent: add 3140kg isopentenol polyoxyethylene ether (molecular weight 1200), stir and melt, then add 384.8kg maleic anhydride and 33.5kg benzoyl peroxide and stir to dissolve ; Then 14.4kg of sodium persulfate, 38.5kg of 3-mercaptopropionate octyl and 340.3kg of hydroxyethyl methacrylate are formulated into a mixed solution, and are dripped with a constant flow pump within 3 hours; Add 106.1kg powder alkali and stir evenly;

[0044] (3) Preparation of powdery polycarboxylate slump retaining a...

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Abstract

The invention provides a powdery polycarboxylic acid type slump retaining agent and a preparation method thereof. The preparation method comprises the following steps: preparing an ester monomer from acrylic acid or methacrylic acid and polylol under the action of a catalyst; carrying out body copolymerization on the ester monomer, acrylate or methacrylate, unsaturated carboxylic acid and / or acid anhydride and a polyether monomer under the action of a compound initiator and a hydrophobic chain transfer agent, so as to obtain a fused-state polycarboxylic acid type slump retaining agent; finally, conveying the fused-state polycarboxylic acid type slump retaining agent into a cooling crusher through a heat preservation pipeline and carrying out low-temperature crushing to prepare the powdery polycarboxylic acid type slump retaining agent. The powdery polycarboxylic acid type slump retaining agent is prepared through adjusting an acid-ether ratio of a polycarboxylic acid type water reducing agent, introducing the acrylate or the methacrylate and the self-made ester monomer and combining the oil-soluble and water-soluble compound initiator. The slump retaining agent provided by the invention has a high slump retaining performance and the preparation cost is reduced; a preparation process is safe and environmental-friendly and has no solvent toxin.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a powdery polycarboxylate slump-retaining agent and a preparation method thereof. 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 10-50% liquid products. Due to their superior performance, they are increasingly used in various key project...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/28C08F220/18C08F220/06C08F222/06C08F220/14C08F222/02C08F2/38C08F2/02C04B24/26
CPCC04B24/2694C08F2/02C08F2/38C08F283/065C08F220/282C08F220/281
Inventor 陈国新祝烨然杜志芹唐修生温金保张友才高超李庆付丹华
Owner NANJING HYDRAULIC RES INST
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