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Modified melamine high efficiency water reducing agent

A high-efficiency water-reducing agent and melamine technology, applied in the field of concrete admixtures, can solve the problems of rough process, poor workability, strong coagulation, etc., and achieve the effect of good self-leveling effect, strong adaptability and strong adaptability

Inactive Publication Date: 2005-06-01
杜云青 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies are simple in technology, rough in process, poor in workability, poor in toughness and strong in coagulation.

Method used

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  • Modified melamine high efficiency water reducing agent
  • Modified melamine high efficiency water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 (proportioning is percentage by weight)

[0020] Put 10% melamine, 6% salicylic acid, 8% citric acid, 5% sulfamic acid, 32% formaldehyde, 8% caustic soda, and 31% water in the reactor, and gradually raise the temperature from 70°C to 90°C, The present invention is generated through 4 hours of hydroxyl, sulfonation and polymerization reactions.

Embodiment 2

[0021] Embodiment 2 (proportioning is percentage by weight)

[0022] Put 8% melamine, 7% salicylic acid, 9% citric acid, 6% sulfamic acid, 34% formaldehyde, 10% caustic soda, and 26% water in the reactor, and gradually raise the temperature from 70°C to 90°C, The present invention is generated through 6 hours of hydroxyl, sulfonation and polymerization reactions.

Embodiment 3

[0023] Embodiment 3 (proportioning is percentage by weight)

[0024] Put 6% melamine, 8% salicylic acid, 10% citric acid, 4% sulfamic acid, 33% formaldehyde, 9% caustic soda, and 30% water in the reactor, and gradually raise the temperature from 70°C to 90°C, The present invention is generated through 7 hours of hydroxyl, sulfonation and polymerization reactions.

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Abstract

The high-efficiency modified melamine water reducer has melamine as main material and salicylic acid, citric acid, formaldehyde, caustic sodan and water as supplementary material in strict compounding proportion and reacted at certain temperature to form linear high molecular water soluble sulfonated resin liquid. The present invention is used widely of prefabricated member, reinforced concrete and prestressed reinforced concrete, and has extremely high compatibility with various kinds of cement and admixture, retardation setting time as long as 17 hr and water reducing rate up to 15-35 %.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a modified melamine high-efficiency water reducer. Background technique [0002] At present, in order to improve the performance of concrete, mortar or concrete must be mixed with admixtures, such as air-entraining agents, retarders, expansion agents, early strength agents, etc., during or before mixing. The water reducer is a very important admixture, it can improve the workability of the concrete without increasing the water consumption, and can maintain the same workability of the concrete when reducing the water consumption of the concrete. Additives that increase strength. Currently widely used water reducers such as early strength water reducers and retarded water reducers have poor water retention performance, and concrete is prone to stratification and segregation, and the retarding time is short, generally only 7-8 hours, and some Only 4-5 hours, can not me...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B24/20
Inventor 杜云青马高基
Owner 杜云青