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Preparation method of polycarboxylate superplasticizer for small-slump concrete

A technology of slump and concrete, which is applied in the field of chemical building materials, can solve problems such as cumbersome process and human health hazards, and achieve the effects of low dosage sensitivity, large range of activities, and increased swing freedom

Inactive Publication Date: 2020-01-03
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-carrying agent used in the esterification process of this preparation method is generally organic solvents such as xylene and cyclohexane, which are harmful to human health, and the water-carrying agent needs to be removed later, and the process is a bit cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of polycarboxylate water reducer for small slump concrete, comprising the following steps:

[0024] Step 1. Mix 200 parts of ethylene glycol monovinyl polyethylene glycol ether macromonomer, 150 parts of tap water, 2 parts of sodium hydroxide, 0.5 parts of unsaturated carboxylic acid, 2-acrylamido-2-methylpropanesulfonate Add 0.5 part of acid, 0.1 part of chain transfer agent, 1 part of catalyst and 1 part of initiator one by one into a four-neck flask and stir evenly;

[0025] Step 2. Mix 20 parts of unsaturated carboxylic acid, 0.2 part of acrylate, 0.5 part of chain transfer agent, and 30 parts of tap water to obtain A solution; mix 0.3 part of reducing agent and 30 parts of tap water to obtain B solution;

[0026] Step 3. Drop A solution and B solution into a four-necked flask for reaction at the same time. The reaction start temperature is 15°C, the dropwise addition time is 30min, and the reaction is continued for 35min after the dropwise addi...

Embodiment 2

[0029] A preparation method of polycarboxylate water reducer for small slump concrete, comprising the following steps:

[0030] Step 1. Mix 230 parts of ethylene glycol monovinyl polyethylene glycol ether macromonomer, 170 parts of tap water, 3 parts of sodium hydroxide, 3 parts of unsaturated carboxylic acid, 2-acrylamido-2-methylpropanesulfonate Add 3 parts of acid, 0.3 part of chain transfer agent, 2 parts of catalyst and 2 parts of initiator one by one into a four-necked flask and stir evenly;

[0031] Step 2: Mix 25 parts of unsaturated carboxylic acid, 3 parts of acrylate, 0.6 parts of chain transfer agent, and 38 parts of tap water to obtain A solution; mix 0.5 parts of reducing agent and 40 parts of tap water to obtain B solution;

[0032] Step 3. Drop A solution and B solution into a four-necked flask for reaction at the same time. The initial reaction temperature is 18°C, the dropwise addition time is 35min, and the reaction is continued for 40min after the dropwise ...

Embodiment 3

[0035] A preparation method of polycarboxylate water reducer for small slump concrete, comprising the following steps:

[0036] Step 1. Mix 250 parts of ethylene glycol monovinyl polyethylene glycol ether macromonomer, 180 parts of tap water, 4 parts of sodium hydroxide, 7 parts of unsaturated carboxylic acid, 2-acrylamido-2-methylpropanesulfonate Add 7 parts of acid, 0.6 part of chain transfer agent, 3 parts of catalyst and 3 parts of initiator one by one into the four-necked flask and stir evenly;

[0037] Step 2. Mix 26 parts of unsaturated carboxylic acid, 10 parts of acrylate, 0.8 parts of chain transfer agent, and 43 parts of tap water to obtain A solution; mix 0.6 parts of reducing agent and 45 parts of tap water to obtain B solution;

[0038] Step 3. Drop A solution and B solution into a four-necked flask for reaction at the same time. The initial reaction temperature is 22°C, the dropwise addition time is 45min, and the reaction is continued for 55min after the dropwi...

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Abstract

The invention discloses a preparation method of a polycarboxylate superplasticizer for small-slump concrete. The preparation method comprises the following steps: 1, an ethylene glycol monovinyl polyethylene glycol ether macromonomer, tap water, sodium hydroxide, unsaturated carboxylic acid and 2-acrylamide-2-methylpropanesulfonic acid are added into a four-necked flask one by one, and are uniformly stirred; 2, unsaturated carboxylic acid, tap water and other materials are uniformly mixed to obtain a solution A, and a reducing agent and tap water are uniformly mixed to obtain a solution B; 3,the solution A and the solution B are dropwise added into the four-necked flask at the same time and are reacted; and 4, the pH value of a polymer prepared in step 3 to 5-7 by using an alcohol amine monomer. The polycarboxylate superplasticizer synthesized by adopting the novel polyether in the preparation method improves the wrapping property and winding property of a polyether side chain, so theconcrete has good workability and good flow retentivity, the plasticity and cohesiveness in small-slump concrete are improved, and hysteresis bleeding is avoided; the polycarboxylate superplasticizerhas low sensitivity to the water consumption of concrete, and has a good water-retaining property; and the preparation method has the advantages of simple production process, no generation of wastes,greenness, environmental friendliness, short reaction period, and easiness in realization of large-scale production.

Description

technical field [0001] The invention relates to the technical field of chemical building materials, in particular to a preparation method of a polycarboxylate water reducer for concrete with small slump. Background technique [0002] Small slump concrete means that the initial slump is 160-180mm, the concrete has excellent workability, no segregation, no bleeding, moderate viscosity, small slump loss over time, and no obvious hysteresis reaction. , high-performance concrete that is easy to pump for construction. With the continuous improvement of the quality requirements of concrete engineering and the continuous development and progress of construction technology, this type of concrete is used more and more, such as nuclear power projects, prefabricated components, roller compacted concrete and other fields. The water-reducing rate of polycarboxylate superplasticizers commonly used in construction projects is generally high, relying on a slight over-mixing to compensate fo...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/58C08F220/06C08F222/06C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/06C08F222/06
Inventor 陈杰邓妮田应兵方世昌皮永奇
Owner GUIZHOU DR SHI TECH
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