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Method for preparing powder polycarboxylic acid superplasticizer

A technology of superplasticizer and polycarboxylic acid, which is applied in the field of preparing powdery high-performance superplasticizer for mortar and concrete, can solve the problem that powdery polycarboxylate superplasticizer has not been solved, and can reduce transportation costs. Cost and packaging costs, low bleed air, and ease of use

Active Publication Date: 2013-02-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the fundamental problems in the preparation of powdered polycarboxylate superplasticizers have not been resolved

Method used

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  • Method for preparing powder polycarboxylic acid superplasticizer
  • Method for preparing powder polycarboxylic acid superplasticizer
  • Method for preparing powder polycarboxylic acid superplasticizer

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] Add 28.07g of acrylic macromonomer with m=1, n=9, propylene oxide and ethylene oxide random copolymerization of isobutylene alcohol open ether with m=90, n=22 into the four-necked flask equipped with stirring 264.55g of quasi-macromonomer and 185g of distilled water were fully stirred, and the temperature was raised to 80°C. Dissolve 14.4 g of acrylic acid and 31.6 g of sodium methacrylate in 21.56 g of distilled water to prepare solution A, and dissolve 1.14 g of ammonium persulfate in 20.0 g of distilled water to prepare solution B. At 80°C, solutions A and B were added dropwise for 2 hours respectively, and then kept at constant temperature for 1 hour. After the heat preservation was completed, the temperature was lowered to 45°C, and 10.0 g of 60% NaOH solution was added to neutralize to pH = 7 to prepare a polycarboxylate superplasticizer sample 1 with a concentration of 60%. The neutralized polycarboxylate superplasticizer solution is spray-dried to obtain the po...

Embodiment 2

[0027]Add m=95, n=5 propylene oxide and ethylene oxide block copolymerization (in which ethylene oxide and propylene oxide are arranged in 40-5-45 blocks) isopentyl to a stirring four-necked flask Mix 700.0g of enol-terminated ether macromonomer and 500.0g of distilled water thoroughly, raise the temperature to 20°C, and mix 58.1g of fumaric acid, 5.0g of thioglycolic acid, and 12.6g of 30% hydrogen peroxide in sequence every 5 to 10 minutes. was added into a four-neck flask. Dissolve 8.71 g of ascorbic acid in 88.6 g of distilled water to prepare an aqueous solution. Within 5-10 minutes of adding hydrogen peroxide, add ascorbic acid aqueous solution dropwise at 20°C for 3 hours, and then keep the temperature for 3 hours. After the heat preservation was completed, 20.0 g of 40% NaOH solution and 5 g of triethanolamine were added directly to neutralize to pH=7.5 to prepare a polycarboxylate superplasticizer sample 2 with a concentration of 40%. The neutralized polycarboxylate...

Embodiment 3

[0029] Add 260.5g of propylene oxide and ethylene oxide random copolymerization of prenol-terminated ether macromonomers with m=n=25 to a four-necked flask equipped with stirring, and 250g of distilled water, stir well, and heat up to 60°C , 35.55g of acrylamide and 3.0g of n-dodecyl mercaptan were added to the four-necked flask at one time every 5~10min in order, and 3.6g of ammonium persulfate was dissolved in 52.7g of distilled water to make a uniform aqueous solution. was added into a four-neck flask. Incubate at constant temperature for 4 hours at 60°C. After the heat preservation was completed, the temperature was lowered to 45°C, 5.0 g of 50% NaOH solution and 2 g of diethanolamine were added, neutralized to pH=8.0, and a polycarboxylate superplasticizer sample 3 with a concentration of 50% was prepared. The neutralized polycarboxylate superplasticizer solution is spray-dried to obtain a polycarboxylate superplasticizer powder product. The spray-drying parameters are: ...

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Abstract

The invention discloses a method for preparing a powder polycarboxylic acid superplasticizer, belonging to the field of concrete admixtures. The method comprises the following steps: by using persulfate, oxydol or a redox system using persulfate and oxydol as oxidizers as an initiator and unsaturated ester or ether large monomer a, unsaturated carboxylic acid or acid anhydride thereof b and unsaturated amide and derivatives thereof c as reaction monomers, adding a chain-transfer agent d, carrying out water solution polymerization at 20-80 DEG C to prepare a liquid product of which the solid content is 40-80%; and carrying out powder spray drying on the liquid product with a centrifugal spray drier to obtain the powder polycarboxylic acid superplasticizer. The powder polycarboxylic acid superplasticizer can be widely used in grouting materials, dry powder mortar and powder paint. A certain amount of epoxypropane is introduced into the reaction large monomers to regulate the HLB (hydrophile-lipophile balance) value of the polycarboxylic acid superplasticizer, so that the finally synthesized superplasticizer has necessary hydrophilicity and lower water retaining capacity; and the superplasticizer can be easily dehydrated in the drying process, can not easily absorb water in the storage process, and is convenient for storage, transportation and use.

Description

technical field [0001] The invention relates to the technical field of preparing a powdery high-performance superplasticizer for mortar and concrete, in particular to a specific preparation method of a powdery polycarboxylic acid superplasticizer. Background technique [0002] As a new generation of high-performance superplasticizer, polycarboxylate superplasticizer has high water reducing rate, low dosage, good slump retention ability of fresh concrete, small shrinkage of hardened concrete, low alkali content, and no chlorine It has been widely used in various concrete structural projects, especially in the preparation of high-performance concrete. However, all liquid water reducer products are currently used, which require special packaging, transportation and storage devices. Among them, 50-60% of the transported liquid products contain water that can be obtained everywhere, which is not only complicated to operate, but also not conducive to energy saving and reduction. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F228/02C08F220/06C08F222/02C08F220/56C08F220/58C08F2/38C08F4/40C04B24/16C04B24/26C04B103/32
Inventor 王子明李慧群卢子臣路芳刘晓崔素萍兰明章毛倩瑾王亚丽
Owner BEIJING UNIV OF TECH
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