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Super-slowly coagulating water reducer of concrete and its prepn.

A water-reducing agent and super-retarding technology, applied in the textile industry wastewater treatment and other directions, can solve problems such as incompatibility, and achieve the effects of small dosage, good adaptability and high water-reducing rate

Active Publication Date: 2006-09-20
SHANGHAI JIANWEI CULTURAL HERITAGE CONSERVATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical route of the present invention is: in view of the characteristics and main problems of the current ordinary super retarder, and the incompatibility existing when used in combination with different types of concrete water reducing agents, use the excellent phosphate in the inorganic retarder Chelation, retarding effect, organic retarder efficient retarding effect, optimize organic and inorganic combination, choose vinylamine alkyl phosphonate or vinylamine alkyl phosphonic acid as super retarding component, because it can be used in suitable concentration It has good compatibility with different types of superplasticizers, and can prepare different super retarded superplasticizers

Method used

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  • Super-slowly coagulating water reducer of concrete and its prepn.
  • Super-slowly coagulating water reducer of concrete and its prepn.

Examples

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Effect test

Embodiment 1

[0035] Weigh 120g of modified lignosulfonate water reducer powder, dissolve it into a liquid water reducer with a concentration of 25%, and then add 2g of ethylene to the liquid modified lignosulfonate water reducer Stir diamine-tetramethylphosphonic acid and 40 g of phosphobutane tricarboxylic acid at a speed of 30 rpm, and stir for 20 minutes to obtain a super retarded superplasticizer. When used, it is prepared into an aqueous solution with a certain concentration in proportion.

Embodiment 2

[0037] Weigh 100g of naphthalenesulfonate water reducer powder, dissolve it into a liquid water reducer with a concentration of 25%, and then add 2g of ethylenediamine-tetramethyl to the liquid naphthalenesulfonate water reducer Phosphonic acid, 80 g of phosphobutane tricarboxylic acid, and 0.08 g of sodium lauryl sulfate were stirred at a speed of 20 rpm, and stirred for 40 minutes to obtain a super retarded superplasticizer. When used, it is prepared into an aqueous solution with a certain concentration in proportion.

Embodiment 3

[0039] Weigh 99.2g of polycarboxylic acid liquid superplasticizer with a concentration of 25%, mix in 48g of ethylenediamine-tetramethylphosphonic acid, 2g of phosphobutanetricarboxylic acid, and 0.4g of sodium lauryl sulfate for stirring , rotate at 30 rpm, and stir for 30 minutes to get super retarded superplasticizer. When used, it is prepared into an aqueous solution with a certain concentration in proportion.

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Abstract

This invention relates to the field of concrete complex super-retarding water reducers. The super-retarding water reducer in this invention has a mass-fraction composition as follows: 0.5~25% ethylene polyamine alkyl phosphonic acid or its salt, 0.5~20% phosphonobutane tricarboxylic acid, 20~50% water reducers, 0~ 0.5% sodium dodecyl sulphates and water as the rest. There are two preparation methods in this invention, one is that, components mentioned above are directly mixed with water reducers at those mass fractions so as to form super-retarding water reducers; the other is that, super-retarding components are added during water reducer preparation. The super-retarding water reducers in this invention are compatible with different kinds of water reducers. They perform extraordinary retarding activities without any side effect.

Description

technical field [0001] The invention relates to the field of super-retarding superplasticizers for composite concrete. Background technique [0002] At present, the concrete retarders used at home and abroad are divided into two categories, inorganic and organic. The inorganic type mainly includes borax, zinc oxide, phosphate and metaphosphate, etc. The organic type mainly includes lignosulfonate, hydroxycarboxylic acid (salt), sugars and carbohydrates, polyols and their derivatives, etc. Organic retarders are widely used. However, these retarders have some disadvantages at present. One is that they are only ordinary retarders. When the amount exceeds a certain value, the concrete will have problems such as non-setting and strength decline; The adaptability of the water reducing agent is poor, and sometimes when it is used in combination with the water reducing agent, it may even produce a coagulation-promoting effect; the third is that the adaptability to many domestic ce...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B24/04C04B24/16C02F103/30
Inventor 蒋正武
Owner SHANGHAI JIANWEI CULTURAL HERITAGE CONSERVATION TECH CO LTD
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