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Mud-resistant polycarboxylate superplasticizer, preparation method of polycarboxylate superplasticizer as well as application in concrete

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of mud resistance of compound polycarboxylate water reducing agent, can solve the problems of poor dispersibility, environmental pollution, waste of resources, etc., and achieves improved initial fluidity and high reaction efficiency. , the effect of low price

Active Publication Date: 2017-09-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But only less than 10% of the lignin has been effectively used, and more than 90% of the lignin will be burned directly, which not only pollutes the environment, but also wastes resources
In the present invention, a kind of anti-mud sacrificial agent is firstly obtained by quaternization reaction with lignin sulfonate as raw material, and then the anti-mud type polycarboxylate water-reducer is prepared by simple compounding with traditional polycarboxylate water-reducer, and Apply it in mud-containing slurry, mortar, and concrete systems to overcome the disadvantages of poor dispersion of traditional polycarboxylate superplasticizers in mud-containing systems

Method used

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  • Mud-resistant polycarboxylate superplasticizer, preparation method of polycarboxylate superplasticizer as well as application in concrete
  • Mud-resistant polycarboxylate superplasticizer, preparation method of polycarboxylate superplasticizer as well as application in concrete
  • Mud-resistant polycarboxylate superplasticizer, preparation method of polycarboxylate superplasticizer as well as application in concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Dissolve 70g of wheatgrass sodium lignosulfonate in a beaker, add 280mL of deionized water, adjust the pH to 12 with sodium hydroxide, fully stir and dissolve for later use. The wheat straw sodium lignosulfonate solution was poured into a four-neck flask, mechanically stirred and heated to 80° C. in a water bath, and the stirring speed was 200 r / min.

[0050] (2) Add 28.01g of 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) into 15.09g of water as a solvent, and then add 3-chloro-2-hydroxypropyltrimethylammonium dropwise to the above-mentioned four-necked flask using a peristaltic pump. Methyl ammonium chloride solution, stirring continuously. Add 14.9 g of 20% NaOH solution and continue heating to 85°C.

[0051] (3) After the addition of the 3-chloro-2-hydroxypropyltrimethylammonium chloride solution is completed, the product can be obtained after the reaction at 85° C. for 4 hours.

[0052] The application test of the quaternized lignosulfonate anti-...

Embodiment 2

[0068] (1) Dissolve 70g of bamboo pulp sodium lignosulfonate in a beaker, add 280mL of deionized water, adjust the pH to 12 with sodium hydroxide, fully stir and dissolve for later use. Pour the sodium lignosulfonate solution of bamboo pulp into a four-necked flask, stir it mechanically and heat it in a water bath to 80°C, and the stirring speed is 200r / min.

[0069] (2) Add 28.01g of 2,4-bis(dimethylamino)-6-chloro-[1,3,5]-triazine (BDAT) into 15.09g of water, and then use a peristaltic pump to drop , continue to stir evenly, add 14.9g of 20% NaOH solution, and continue heating to 85°C.

[0070] (3) After the 2,4-bis(dimethylamino)-6-chloro-[1,3,5]-triazine solution in step (2) was added, the product was obtained after a reaction at 85° C. for 4 hours.

Embodiment 3

[0072](1) Dissolve 70g of wood pulp sodium lignosulfonate in a beaker, add 280mL of deionized water, adjust the pH to 12 with sodium hydroxide, fully stir and dissolve for later use. Pour the wood pulp sodium lignosulfonate solution into a four-necked flask, stir it mechanically and heat it in a water bath to 80°C, and the stirring speed is 200r / min.

[0073] (2) Add 28.01g epoxypropylene-trimethyl-ammonium salt (OMTMA) into 15.09g water, then use a peristaltic pump to drip the epoxypropylene-trimethyl-ammonium salt solution to the above-mentioned four-necked flask, and continue Stir evenly, add 14.9g of 20% NaOH solution, and continue heating to 85°C.

[0074] (3) After adding the epoxypropylene-trimethyl-ammonium salt (OMTMA) solution in the step (2), the product was obtained after the reaction at 85° C. for 4 hours.

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Abstract

The invention belongs to the technical field of mud resistance of compound polycarboxylate superplasticizers and discloses a mud-resistant polycarboxylate superplasticizer, a preparation method of the polycarboxylate superplasticizer as well as application in concrete, particularly application in mud-containing neat paste. The superplasticizer disclosed by the invention is a complex composed of 100 mass parts of a polycarboxylate superplasticizer and 0.01-5 mass parts of a quaternized lignosulfonate mud-resistant sacrificial agent. The quaternized lignosulfonate mud-resistant sacrificial agent is prepared by the following steps: adding a quaternization reagent and alkali into an alkaline lignosulfonate solution, heating, reacting, thereby obtaining the quaternized lignosulfonate. The superplasticizer disclosed by the invention can obviously improve the liquidity of the mud-containing neat paste, such as slump degree or divergence, has obvious mud resistance, is excellent in dispersing performance and low in cost and can be applied to the field of concrete. Synergistic effects can be achieved between the quaternized lignosulfonate mud-resistant sacrificial agent and polycarboxylic acid, and under the same doping amount, the product added with the sacrificial agent has excellent dispersing performance.

Description

technical field [0001] The invention belongs to the field of anti-mud technology of compound polycarboxylate superplasticizer, in particular to a kind of anti-mud polycarboxylate water reducer and its preparation method and application in concrete, especially in mud-containing slurry application. Background technique [0002] Concrete is the most widely used building material in today's society. In infrastructure construction, in order to obtain high-performance concrete, high-performance water reducing agents are usually added to it. In the 1980s, polycarboxylate superplasticizer (PCE) was used in concrete as a new generation of concrete admixture. Polycarboxylate superplasticizer is a series of superplasticizers with excellent performance in water reduction, slump retention, plasticization, shrinkage and environmental protection, etc., which are made of unsaturated monomers containing carboxyl groups and other monomers. Can significantly reduce the water-cement ratio, i...

Claims

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Application Information

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IPC IPC(8): C04B24/18C08H7/00
CPCC04B40/0039C04B2103/302C08H6/00C04B24/18
Inventor 邱学青郑大锋郑涛李小康蔡诚楼宏铭杨东杰
Owner SOUTH CHINA UNIV OF TECH