Super-long super slow release type polycarboxylic acid slump-retaining agent master batch

An ultra-slow-release polycarboxylic acid technology, which is applied in the field of admixtures for cement-based cementitious materials, can solve problems such as segregation, bleeding, large loss of concrete slump, and difficulty in construction, etc., to prolong the setting time and prolong High slump performance and high strength

CN106699985AInactive Publication Date: 2017-05-24HUBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-05-24
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a super-long super slow release type polycarboxylic acid slump-retaining agent master batch suitable for projects such as hydraulic tunnels, railway tunnels, metros and underground oil and gas delivery adopting concrete having the capability of retaining slump for 4-6 hours under the conditions of hot weather and long distance. Limited by 40% of the mass percent of mother liquid, the total mass of synthesized raw materials is 1000 parts, the usage amount proportion is that the usage amount of polyether macromonomer accounts for 325-335 parts, the usage amount of unsaturated carboxylic acid micro-monomer accounts for 10.0-18.0 parts, the usage amount of acrylic hydroxyalkanoate accounts for 35.0-45.0 parts, the usage amount of crosslinking monomer accounts for 5.0-10.0 parts, the usage amount of sulfonic acid type chain transfer agent accounts for 2.0-5.0 parts, the usage amount of hydrogen peroxide accounts for 2.0-3.5 parts, the usage amount of vitamin C accounts for 0.60-0.90 part, the usage amount of caustic soda liquid accounts for 7-10 parts, and the balance is water. The polycarboxylic acid slump-retaining agent is moderate in molecular weight, can be independently used or compounded with other polycarboxylic acid water reducing agents for usage, can remarkably improve the indexes such as slump-retaining property, cohesiveness and flowing retention ability of newly mixed concrete in 6 hours.
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Description

technical field

[0001] The invention relates to the technical field of admixtures for cement-based cementitious materials, in particular to an ultra-long and ultra-slow-release polycarboxylate slump-retaining agent masterbatch, which is suitable for long-term transportation that will cause excessive loss of concrete slump Large hydraulic tunnels, railway tunnels, subways, underground oil and gas transmission and storage projects. Background technique

[0002] With the rapid development of my country's economy and the improvement of construction level, the problem of slump loss of fresh concrete has always been a difficult problem in engineering construction, especially the long-term transportation will lead to excessive loss of concrete slump, which will affect the work of concrete sex. Especially with the excavation and construction of ultra-long tunnels, the engineering community has higher and higher requirements for the slump and fluidity of wet shotcrete used in tunnels...

Examples

Embodiment 1

[0026] An ultra-long and ultra-slow-release polycarboxylic acid slump-retaining agent masterbatch, characterized in that: the slump-retaining agent is polymerized from the following components, the total mass of raw materials is 1000 parts, and the components and process parameters are as follows:

[0027] Primer: methallyl polyoxyethylene ether with a molecular weight of 2400: 327, water: 220;

[0028] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 3.0, water: 10;

[0029] Add the initiator and the small monomer solution sequentially within 10 minutes after adding the hydrogen peroxide;

[0030] Initiator: sodium methacrylate: 3.7, vitamin C: 0.70, water: 110;

[0031] Small monomer solution: itaconic acid: 15.5, hydroxyethyl acrylate: 42.8, methoxy polyethylene glycol acrylate: 5.5, water: 65;

[0032] Initiator dropping time: 3.5h;

[0033] The small monomer solution dripping time is 3.0h;

[0034] Holding time: 1.5h;

[0035] Liquid caustic: 8; ...

Embodiment 2

[0039] Primer: 2400 molecular weight isopentenol polyoxyethylene ether: 332, water: 235;

[0040] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 2.5, water: 10;

[0041] Add the initiator and the small monomer solution sequentially within 10 minutes after adding the hydrogen peroxide;

[0042] Initiator: sodium vinyl sulfonate: 4.5, vitamin C: 0.75, water: 110;

[0043] Small monomer solution: fumaric acid: 8.5, aconitic acid: 2.5, hydroxyethyl acrylate: 15.8, hydroxypropyl acrylate: 23.7, polyethylene glycol bismaleic acid monoester: 6.0, water: 70;

[0044] Initiator dropping time: 3.5h;

[0045] The small monomer solution dripping time is 3.0h;

[0046] Holding time: 2.0h;

[0047] Liquid caustic: 9;

[0048] Hydration: 169.75.

[0049] After stirring evenly, let it stand for 10~15h.

Embodiment 3

[0051] Primer: 3000 molecular weight isobutylene alcohol polyoxyethylene ether: 109, 2400 molecular weight isobutylene alcohol polyoxyethylene ether: 218, water: 250;

[0052] Hydrogen peroxide solution: 27.5% Industrial grade hydrogen peroxide: 3.5, water: 10;

[0053] Add the initiator and the small monomer solution sequentially within 10 minutes after adding the hydrogen peroxide;

[0054] Initiator: sodium allyl sulfonate: 4.9, vitamin C: 0.85, water: 118;

[0055] Small monomer solution: maleic acid: 11.5, hydroxyethyl acrylate: 16.2, hydroxypropyl acrylate: 24.3, polyethylene glycol bismaleic acid monoester: 8.5, water: 80;

[0056] Initiator dropping time: 4.0h;

[0057] The small monomer solution dripping time is 3.5h;

[0058] Holding time: 2.0h;

[0059] Liquid caustic soda: 7.5;

[0060] Hydration: 137.75.

[0061] After stirring evenly, let it stand for 10~15h.