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Polycarboxylate superplasticizer masterbatch capable of prolonging coagulating time of concrete and preparation method thereof

A technology of setting time and polycarboxylic acid, applied in the field of polycarboxylate superplasticizer masterbatch and its preparation, can solve the problems of waste of concrete and the rising cost of compounding pumping agent, and achieve the effect of prolonging the setting time

Inactive Publication Date: 2014-05-28
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summer, as the temperature rises, the setting time decreases rapidly, and sometimes it will cause waste of concrete due to the impact of construction. At this time, it is necessary to adjust the setting time. The usual method is to add a large amount of sodium gluconate (polycarboxylate superplasticizer. Features: Adding a small amount of condensing time does not change significantly at high temperature), and the cost of pumping agent compounding increases greatly

Method used

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  • Polycarboxylate superplasticizer masterbatch capable of prolonging coagulating time of concrete and preparation method thereof
  • Polycarboxylate superplasticizer masterbatch capable of prolonging coagulating time of concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Add 300g of prenol polyoxyethylene ether, 10g of maleic anhydride, and 400g of water into a three-neck flask with a capacity of 1000ml, start stirring to fully dissolve it, and heat it up to 65°C for use;

[0032] A material configuration: Add 4g of ammonium persulfate, 8.5g of 2-acrylamide-2-methylpropanesulfonate sodium and 150g of water into a 250ml beaker, stir and mix evenly, make it fully dissolved, and set aside;

[0033] B material configuration: Add 34g of acrylic acid, 5g of isopropanol, and 6.8g of methyl methacrylate into a 50ml beaker, stir and mix evenly, make it fully dissolved, and set aside;

[0034] 2. Add material A and material B dropwise to the three-necked flask at the same time, finish dropping in 4.5 hours, and keep the temperature constant during the dropping process;

[0035] 3. After the dropwise addition is completed, keep the temperature constant and heat-preserve for 1 hour;

[0036] 4. Cool down to 45°C and discharge.

Embodiment 2

[0038] 1. Add 300g of prenol polyoxyethylene ether, 10g of maleic anhydride, and 400g of water into a three-neck flask with a capacity of 1000ml, start stirring to fully dissolve it, and heat it up to 75°C for use;

[0039] A material configuration: Add 5g sodium persulfate, 8.5g 2-acrylamide-2-methylpropanesulfonate sodium and 150g water into a 250ml beaker, stir and mix evenly, make it fully dissolved, and set aside;

[0040] B material configuration: Add 34g of acrylic acid, 5g of isopropanol, and 6.8g of methyl methacrylate into a 50ml beaker, stir and mix evenly, make it fully dissolved, and set aside;

[0041] 2. Add material A and material B dropwise to the three-necked flask at the same time, finish dropping in 4.5 hours, and keep the temperature constant during the dropping process;

[0042] 3. After the dropwise addition is completed, keep the temperature constant and heat-preserve for 1 hour;

[0043] 4. Cool down to 45°C and discharge.

Embodiment 3

[0045] 1. Add 300g of prenol polyoxyethylene ether, 10g of maleic anhydride, and 400g of water into a three-necked flask with a capacity of 1000ml, start stirring to fully dissolve it, and heat it up to 85°C for use;

[0046] A material configuration: Add 6g potassium persulfate, 8.5g 2-acrylamide-2-methylpropanesulfonate sodium and 150g water into a 250ml beaker, stir and mix evenly, make it fully dissolved, and set aside;

[0047] B material configuration: Add 34g of acrylic acid, 5g of isopropanol, and 6.8g of methyl methacrylate into a 50ml beaker, stir and mix evenly, make it fully dissolved, and set aside;

[0048] 2. Add material A and material B dropwise to the three-necked flask at the same time, finish dropping in 4.5 hours, and keep the temperature constant during the dropping process;

[0049] 3. After the dropwise addition is completed, keep the temperature constant and heat-preserve for 1 hour;

[0050] 4. Cool down to 45°C and discharge.

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Abstract

The invention relates to a water-reducing agent for concrete and a preparation method thereof, in particular to a polycarboxylate superplasticizer masterbatch capable of prolonging the coagulating time of concrete and a preparation method thereof. The polycarboxylate superplasticizer masterbatch capable of prolonging the coagulating time of concrete is formed by polymerizing isoamyl alcohol polyoxyethylene ether, maleic anhydride, 2-acrylamide-2-methyl sodium propanesulfonate, acrylic acid, methyl methacrylate, an initiator, a chain transfer agent and water. The prepared polycarboxylate superplasticizer masterbatch adopts a comb-type structure of the conventional polycarboxylate superplasticizer, an isoamyl alcohol polyoxyethylene ether macromonomer is used as a side chain, a calcium ion chelating structure which is copolymerized from acrylic acid, maleic anhydride, methyl methacrylate and 2-acrylamide-2-methyl sodium propanesulfonate is used as a main chain, the polycarboxylate superplasticizer masterbatch has water-reducing and coagulation-slowing effects, can obviously prolong the coagulating time of polycarboxylic acid concrete, and is applicable to preparation of a pumping agent for concrete in summer.

Description

technical field [0001] The invention relates to a water reducer for concrete and a preparation method thereof, in particular to a polycarboxylate water reducer masterbatch capable of prolonging the setting time of concrete and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizers have appeared in my country since the 1990s. After more than 20 years of development, their performance has been continuously improved, and their application fields have been continuously expanded. Mainstream water reducer varieties. [0003] Types of polycarboxylate superplasticizers: according to the performance, there are water-reducing type, standard type, slump-preserving type, early-strength type, etc.; according to the different bonding methods of polyoxyethylene and the main chain, it can be divided into esters , ethers and amines. Polycarboxylate superplasticizers are all comb-shaped structures, and their side chains are polyoxyethylene structures. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C08F220/14C08F220/58C08F2/38C04B24/16C04B103/30
Inventor 陈杰杨国武方世昌皮永奇
Owner GUIZHOU DR SHI TECH
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