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Anti-mud polycarboxylate water reducing agent masterbatch with monoalkyl phosphate and di-alkyl phosphate branches

A technology of mono- and di-alkyl phosphate esters and polycarboxylic acids, which is applied in the field of cement additives, can solve problems such as limited adaptability, inability to uniformly solve the problems of water reducing rate and slump retention, and the increase of solid content or dosage, and achieve good adaptability

Inactive Publication Date: 2017-04-26
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nowadays, PEG sacrificial agents and cationic polymers have limited adaptability to muddy mechanism sandstone in construction projects, and cannot uniformly solve the problems of water reducing rate and slump retention, and the increase in solid content or dosage increases the cost significantly

Method used

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  • Anti-mud polycarboxylate water reducing agent masterbatch with monoalkyl phosphate and di-alkyl phosphate branches
  • Anti-mud polycarboxylate water reducing agent masterbatch with monoalkyl phosphate and di-alkyl phosphate branches
  • Anti-mud polycarboxylate water reducing agent masterbatch with monoalkyl phosphate and di-alkyl phosphate branches

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A mono- and di-alkyl phosphate branched anti-mud polycarboxylate superplasticizer masterbatch. The superplasticizer is polymerized from the following components. The total mass of raw materials is 1000. The components and process parameters are as follows:

[0039] Primer: methallyl polyoxyethylene ether with a molecular weight of 2400: 358, water: 220;

[0040] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 3.5, water: 10;

[0041] After the hydrogen peroxide is added, sodium hypophosphite and one-third of the acrylic acid are added at one time;

[0042] Sodium hypophosphite: 3.0, acrylic acid (first cast): 11.0

[0043] After the above-mentioned phosphate-based chain transfer agent and one-third of the acrylic acid are injected at one time, add the initiator and the small monomer solution sequentially within 10 minutes;

[0044] Initiator: thioglycolic acid: 0.8, vitamin C: 0.75, water: 120;

[0045] Small monomer solution: acrylic acid (drop...

Embodiment 2

[0052] A mono- and di-alkyl phosphate branched anti-mud polycarboxylate superplasticizer masterbatch. The superplasticizer is polymerized from the following components. The total mass of raw materials is 1000. The components and process parameters are as follows:

[0053] Primer: 3000 molecular weight isobutylene alcohol polyoxyethylene ether: 355, water: 220;

[0054] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 4.5, water: 10;

[0055] After the hydrogen peroxide is added, sodium hypophosphite and one-third of the acrylic acid are added at one time;

[0056] Disodium hydrogen phosphite: 1.5, acrylic acid (first cast): 12.0;

[0057] After the above-mentioned phosphate-based chain transfer agent and one-third of the acrylic acid are injected at one time, add the initiator and the small monomer solution sequentially within 10 minutes;

[0058]Initiator: thioglycolic acid: 1.0, vitamin C: 0.68, water: 120;

[0059] Small monomer solution: Acrylic aci...

Embodiment 3

[0066] A mono- and di-alkyl phosphate branched anti-mud polycarboxylate superplasticizer masterbatch. The superplasticizer is polymerized from the following components. The total mass of raw materials is 1000. The components and process parameters are as follows:

[0067] Primer: 3500 molecular weight isopentenol polyoxyethylene ether: 352, water: 220;

[0068] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 4.5, water: 10;

[0069] After the hydrogen peroxide is added, sodium hypophosphite and one-third of the acrylic acid are added at one time;

[0070] Sodium hypophosphite: 3.5, sodium dihydrogen phosphate: 1.5, acrylic acid (first cast): 12.5;

[0071] After the above-mentioned phosphate-based chain transfer agent and one-third of the acrylic acid are injected at one time, add the initiator and the small monomer solution sequentially within 10 minutes;

[0072] Initiator: thioglycolic acid: 0.65, vitamin C: 0.57, water: 120;

[0073] Small monomer ...

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Abstract

The invention discloses anti-mud polycarboxylate water reducing agent masterbatch with mono-di-alkyl phosphate branches. The masterbatch is used for higher-content clay minerals in gravel materials. The masterbatch shows characteristics of not low initial water reduction rate, good slump retaining property in the medium and late stages and good overall stability. In terms of 1000 parts of the total mass of the synthesis raw materials, 40% in percentage by mass, as the limit, of the masterbatch comprises the raw materials as follows: 350-360 parts of polyether macromonomers, 32.0-38.0 parts of acrylic acid, 2.0-6.0 parts of mono-di-alkyl phosphate, 1.0-5.0 parts of a phosphate chain transfer agent, 0.5-1.0 part of mercaptoacetic acid, 3.0-6.0 parts of hydrogen peroxide, 0.5-0.8 parts of vitamin C, 7-15 parts of liquid alkali and the balance of water. A synthesized polycarboxylate water reducing agent has large molecular weight and longer main chain, comprises long and short staggered branches, and is high in density, high in slump retaining property and wide in adaptability.

Description

technical field [0001] The invention relates to a single- and double-alkyl phosphate branched-chain anti-mud type polycarboxylate superplasticizer masterbatch, which is suitable for the situation where the content of clay minerals in sand and gravel ground materials is relatively high, and belongs to the field of cement additives. Background technique [0002] Polycarboxylate superplasticizer has been widely used in large-scale projects such as high-speed railway, water conservancy and hydropower, nuclear power, expressway, harbor wharf, etc. due to its high water reduction, high slump retention, and high reinforcement; Compared with other high-efficiency water reducers, the water reducing rate and slump retention of polycarboxylate water reducers are more sensitive to the mud content of sand and gravel. The reason is that negatively charged clay particles interact with PCE molecules and positively charged cement particles, which reduces the adsorption capacity of cement par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/02C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F283/065C08F220/06C08F230/02
Inventor 柯凯常鹰冯晶红严明
Owner HUBEI UNIV OF TECH
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