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A kind of polycarboxylate superplasticizer masterbatch with sulfonic acid phosphoric acid group double chain transfer effect

A technology of sulfonic acid phosphoric acid and chain transfer, which is applied in the field of polycarboxylate superplasticizers, can solve problems such as poor compatibility between grinding aids and superplasticizers, complex components of grinding aids, fluctuations in superplasticizers, etc. Achieve uniform distribution of short-chain branched structure of water reducer molecules, improve sulfate resistance and mud resistance, and improve synthesis conversion rate

Active Publication Date: 2019-02-12
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changes in the components of the grinding aid lead to a certain range of fluctuations in the superplasticizer. The components of the grinding aid are complex or the dosage is too high, and the superplasticizer may even fail, that is, the grinding aid and the superplasticizer are prone to compatibility. sexual problems

Method used

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  • A kind of polycarboxylate superplasticizer masterbatch with sulfonic acid phosphoric acid group double chain transfer effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A polycarboxylate superplasticizer masterbatch with sulfonic acid phosphoric acid group double chain transfer, characterized in that: the superplasticizer is polymerized from the following components by mass percentage, the total mass of raw materials is 1000, each group The points and process parameters are as follows:

[0034] Primer: 2400 molecular weight isopentenol polyoxyethylene ether: 345, water: 200;

[0035] Oxidant solution: hydrogen peroxide: 3.0, water: 5;

[0036] Sodium hypophosphite: 1.2

[0037] After the oxidant solution and sodium hypophosphite are added at one time, add the initiator and the small monomer solution dropwise within 10 minutes. After the initiator is added dropwise for 10 minutes, start to add the small monomer solution dropwise;

[0038] Initiator: sodium vinyl sulfonate: 3.5, ascorbic acid: 0.68, water: 120;

[0039] Small monomer solution: acrylic acid: 38.5, water: 50;

[0040] Initiator dropping time: 4.5h;

[0041] The small ...

Embodiment 2

[0045] Primer: 2400 molecular weight vinyl butyl ether polyoxyethylene ether: 348, water: 220;

[0046] Oxidant solution: hydrogen peroxide: 3.5, water: 5;

[0047] Sodium hypophosphite: 3.5

[0048] After the oxidant solution and sodium hypophosphite are added at one time, add the initiator and the small monomer solution dropwise within 10 minutes. After the initiator is added dropwise for 10 minutes, start to add the small monomer solution dropwise;

[0049] Initiator: sodium allyl sulfonate: 5.7, ascorbic acid: 0.52, water: 120;

[0050] Small monomer solution: acrylic acid: 35.6, water: 50;

[0051] Initiator dropping time: 5.5h;

[0052] The small monomer solution dripping time is 5.0h;

[0053] Hydration: 208.18.

[0054] Insulate for 15h to release the reactor.

Embodiment 3

[0056] Primer: 2400 molecular weight vinyl butyl ether polyoxyethylene ether: 346, water: 250;

[0057] Oxidant solution: hydrogen peroxide: 4.8, water: 10;

[0058] Sodium hypophosphite: 4.7

[0059] After the oxidant solution and sodium hypophosphite are added at one time, add the initiator and the small monomer solution dropwise within 10 minutes. After the initiator is added dropwise for 10 minutes, start to add the small monomer solution dropwise;

[0060] Initiator: sodium methacrylate: 7.8, ascorbic acid: 0.20, water: 115;

[0061] Small monomer solution: acrylic acid: 32.8, water: 50;

[0062] Initiator dropping time: 5.0h;

[0063] The small monomer solution dripping time is 4.5h;

[0064] Hydration: 178.7.

[0065] Insulate for 12h to release the reactor.

[0066] Respectively test the initial slump / expansion and slump / expansion of concrete under the same concentration of the polycarboxylate superplasticizer masterbatch of the above-mentioned example of sulfonic ...

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Abstract

A polycarboxylic acid water reducer master batch having a sulpho-phospho double chain transferring function is disclosed. Raw materials include 345-350 parts of a polyether macromonomer, 32.0-40.0 parts of acrylic acid, 3.0-8.0 parts of a sulpho chain transferring agent, 1.0-5.0 parts of a phospho chain transferring agent, 2.0-5.0 parts of hydrogen peroxide and 0.35-0.75 part of vitamin C, with the balance being water, and with the total mass of the raw materials being 1000 parts. A polycarboxylic acid water reducer synthesized from the master batch can be polymerized at a low temperature, carboxyl, sulpho and phosphor groups are alternatively arranged, adsorbability and anchoring capability are stronger, and a product has characteristics of a high water reduction rate and wide adaptability. The modified master batch is suitable for a situation that a grinding aid adopted in a cement preparing process contains a retarder or salt electrolyte the competitive adsorbability of which is higher than competitive adsorbability of the carboxyl and thiol.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer for cement-based cementitious materials, which is suitable for cement with poor compatibility between the grinding aid component and the water reducer, and specifically relates to a sulfonic acid phosphoric acid double chain transfer agent Polycarboxylate superplasticizer masterbatch. Background technique [0002] Grinding aids are usually components such as alcohol amine organic matter, molasses, and salt electrolytes. These components will have a certain impact on the surface energy of cement particles, which will lead to changes in the adsorption on the surface of cement particles. The effect is closely related to the amount of adsorption on the surface of cement particles. In addition, the alcohol amine organic matter in the grinding aid destroys the gypsum and C in the cement. 3 The best match of A, molasses has a slight effect on the dissolution rate of sulfate in cement, and salt electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F2/38C08F4/40C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F2/38C08F4/40C08F283/065C08F220/06
Inventor 柯凯贺行洋李学锋王迎斌苏英常鹰
Owner HUBEI UNIV OF TECH
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