CN104529229B - A kind of enhanced cement grinding aid - Google Patents
A kind of enhanced cement grinding aid Download PDFInfo
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- CN104529229B CN104529229B CN201410755667.2A CN201410755667A CN104529229B CN 104529229 B CN104529229 B CN 104529229B CN 201410755667 A CN201410755667 A CN 201410755667A CN 104529229 B CN104529229 B CN 104529229B
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- diethanol monoisopropanolamine
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Abstract
The invention discloses a kind of enhanced cement grinding aid, it is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 45-70%, diethanol monoisopropanolamine 5-10%, carboxymethyl cellulose 3-7%, molasses 5-10%, surplus is water.The present invention is by being modified diethanol monoisopropanolamine, gained diethanol monoisopropanolamine maleate compound is remarkably improved the early strength of product, by rationally adding other materials, significantly improve the stability of grinding aid, grinding-aid effect, early stage of goods and later strength, reduce production cost, effectively improve the combination property of product, properties of product are made to meet requirements at the higher level, adaptability is wider, overcome the cement grinding aid dependence to triethanolamine and triisopropanolamine, there is significant economic and social benefit.
Description
Technical field
The present invention relates to cement additire technical field, be specifically related to a kind of enhanced cement grinding aid.
Background technology
China is manufacture of cement and consumes big country, the cement industry consumption to the resource such as coal, electric power, and the dust formed in production process, a large amount of harmful gass of discharge, environment for human survival is caused and has a strong impact on, therefore produce the inexorable trend that low environmental load type high-performance cement is cement industry development.For realizing this target, except greatly developing energy-conserving and emission-cutting technology and equipment, another more easy and effective method is to add suitable cement grinding aid in grinding process.
Cement grinding aid is a kind of chemical addition agent improving cement grinding effect and performance, it is possible to significantly improves cement unit-hour output and each age strength of cement, improves its mobility.The Electrostatic Absorption bag ball phenomenon that cement grinding aid can be greatly lowered in grinding process to be formed, it is also possible to reduce the ultra-fine grain formed in grinding process and again coalesce trend.Cement grinding aid also can significantly improve cement fluidity, improves the grinding effect of grinding machine and the grinding efficiency of powder concentrator, thus reducing grinding energy.Using the cement that grinding aid produces to have relatively low compacting coalescence trend, thus being conducive to the handling of cement, and the wall cling phenomenon of cement bunker can be reduced.
At present, the primary raw material of grinding aid is triethanolamine and triisopropanolamine, also has some inorganic salts or organic acid.The grinding-aid effect of triethanolamine and triisopropanolamine is remarkable, puies forward product function strong, but they have respective wretched insufficiency: 1. triethanolamine can only improve early strength, and later strength is substantially free of effect, excessive even can cause strength retraction；2. triisopropanolamine can only improve later strength, and 3 days intensity is not contributed, and the consumption of triisopropanolamine is sensitive, if using many, a large amount of bleed can be caused, thus resulting in concrete strength and declining, density reduces, and surface relief is coarse, with the concrete admixture compatibility in not enough.3. relatively costly, constrain cement grinding aid production cost and control, potentiation that enterprise is earned foreign exchange work produces obstacle.
Patent of invention CN101665339B discloses a kind of enhanced cement composite grinding aid, and it is mainly composed of diethanol-isopropanolamine, molasses, lignosulfonates, inorganic dispersant and water.Grinding aid bulk composition diethanol-isopropanolamine is the succedaneum of triethanolamine and triisopropanolamine in performance, the later strength of concrete product can be greatly improved, but the raising of early strength to be weaker than triethanolamine and the large usage quantity of diethanol-isopropanolamine, and production cost is high.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is provided that a kind of enhanced cement grinding aid.The grinding aid of the present invention is remarkably improved stability and the grinding-aid effect of grinding aid when relatively low-dosage, improves early stage and the later strength of goods simultaneously, and production cost is low, and the compatibility with concrete admixture is good.
The technical scheme that the present invention adopts for achieving the above object is:
A kind of enhanced cement grinding aid is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 45-70%, diethanol monoisopropanolamine 5-10%, carboxymethyl cellulose 3-7%, molasses 5-10%, surplus is water；
Described, grinding aid is through the following steps that prepare: add water in reactor, it is heated to 35-45 DEG C, adds carboxymethyl cellulose, stir 30min, add molasses, stirring 20min, is cooled to room temperature, adds diethanol monoisopropanolamine maleate compound, diethanol monoisopropanolamine, stirring 15min, obtains enhanced cement grinding aid.
Described, diethanol monoisopropanolamine maleate compound prepares by the following method: add diethanol monoisopropanolamine and maleic anhydride in reactor, add catalyst, it is decompressed to 0.3-0.5MPa under stirring condition, heating, temperature controls at 90-100 DEG C, maintenance system constant temperature, every acidity measuring a system every other hour, to acid number without significant change time reaction stop.It is subsequently cooled to room temperature, successively with saturated sodium carbonate solution and distilled water wash, obtains diethanol monoisopropanolamine maleate compound.
Preferably, a kind of enhanced cement grinding aid is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 58%, diethanol monoisopropanolamine 8%, carboxymethyl cellulose 5%, molasses 8%, surplus is water.
Described, the mol ratio of diethanol monoisopropanolamine and maleic anhydride is 1.0:1.0-2.2.
Described, catalyst is the concentrated sulphuric acid of volumetric concentration 98% or mass fraction is the p-methyl benzenesulfonic acid of 1.4%, and the addition of described catalyst is the 1.0-1.5% of the amount of substance of total reactant.
Beneficial effects of the present invention:
1. the grinding aid volume of the present invention is low.During grinding, mix according to the volume of grog and the 0.02-0.05% of composite material gross mass, mill efficiency can be improved and reach 5-9%, also can improve more than cement early strength 3MPa simultaneously, more than later strength 4.5MPa, overcomes the cement grinding aid dependence to triethanolamine and triisopropanolamine.
2. the grinding aid of the present invention is by being modified diethanol monoisopropanolamine, gained diethanol monoisopropanolamine maleate compound is remarkably improved the early strength of product, cross and reasonably add the materials such as diethanol monoisopropanolamine, carboxymethyl cellulose, molasses, effectively improve the combination property of product, properties of product are made to meet requirements at the higher level, good with other concrete admixture adaptability, and consumption is few, production cost can be significantly reduced, preparation method is simple, stability is higher, has significant economic and social benefit, is suitable for large-scale production.
Detailed description of the invention
The invention provides the enhanced cement grinding aid of a kind of stability being namely remarkably improved grinding aid when relatively low-dosage and grinding-aid effect.This grinding aid is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 45-70%, diethanol monoisopropanolamine 5-10%, carboxymethyl cellulose 3-7%, molasses 5-10%, surplus is water.
Wherein diethanol monoisopropanolamine maleate compound, including one or more in diethanol list isopropanol maleic mono-ester, diethanol list isopropanol maleic acid diester, diethanol list isopropanol maleic acid three ester.
Enhanced cement grinding aid prepared by the present invention, utilize maleic anhydride that diethanol monoisopropanolamine is modified, define the compound with amido, hydroxyl, ester group and carboxyl, in grinding process, amido makes powder body have electrostatic repulsion, hydroxyl is adsorbed on powder granule surface, in molecular structure amido, ester group and carboxyl can also with the metal cations Fe in cement2+、Ca2+Deng generation chelation, multiple action effect substantially increases the grinding-aid effect of diethanol monoisopropanolamine maleate compound.The basis of conventional constituents adds diethanol monoisopropanolamine maleate compound, cement grinding mill unit-hour output can be effectively improved, improve cement fluidity, reduce energy consumption, improve the combination property of cement.Light and heat is had good stability by carboxymethyl cellulose, makes grinding aid deposit the long period at different temperatures and remains to remain stable for, degeneration will not occur.Molasses are polyhydroxy Organic substances, are a kind of excellent grinding aids, can be effectively improved cement quality simultaneously, as reduced cement water requirement, improve the aperture structure of cement granules, improve the quality of cement.
Embodiment 1
A kind of enhanced cement grinding aid is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 45%, diethanol monoisopropanolamine 10%, carboxymethyl cellulose 7%, molasses 10%, and surplus is water, and solid content is 42%.
The enhanced cement grinding aid of the present embodiment is through the following steps that prepare: add water in reactor, it is heated to 45 DEG C, add carboxymethyl cellulose, stirring 30min, adds molasses, stirs 20min, it is cooled to room temperature, add diethanol monoisopropanolamine maleate compound, diethanol monoisopropanolamine, stir 15min, obtain enhanced cement grinding aid.
Diethanol monoisopropanolamine maleate compound prepares by the following method: be 1.0:2.2 according to the mol ratio of diethanol monoisopropanolamine and maleic anhydride adds diethanol monoisopropanolamine and maleic anhydride in reactor, add concentrated sulphuric acid or the p-methyl benzenesulfonic acid of 1.0%, carry out under stirring being decompressed to 0.5MPa, heating, temperature controls at 90 DEG C, maintenance system constant temperature, every acidity measuring a system every other hour, to acid number without significant change time reaction stop.It is subsequently cooled to room temperature, successively with saturated sodium carbonate solution and distilled water wash, obtains diethanol monoisopropanolamine maleate compound.
Embodiment 2
A kind of enhanced cement grinding aid is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 54%, diethanol monoisopropanolamine 7%, carboxymethyl cellulose 6%, molasses 6%, and surplus is water, and solid content is 50%.
The enhanced cement grinding aid of the present embodiment is through the following steps that prepare: add water in reactor, it is heated to 40 DEG C, add carboxymethyl cellulose, stirring 30min, adds molasses, stirs 20min, it is cooled to room temperature, add diethanol monoisopropanolamine maleate compound, diethanol monoisopropanolamine, stir 15min, obtain enhanced cement grinding aid.
Diethanol monoisopropanolamine maleate compound prepares by the following method: be 1.0:1.8 according to the mol ratio of diethanol monoisopropanolamine and maleic anhydride adds diethanol monoisopropanolamine and maleic anhydride in reactor, add concentrated sulphuric acid or the p-methyl benzenesulfonic acid of 1.2%, carry out under stirring being decompressed to 0.4MPa, heating, temperature controls at 94 DEG C, maintenance system constant temperature, every acidity measuring a system every other hour, to acid number without significant change time reaction stop.It is subsequently cooled to room temperature, successively with saturated sodium carbonate solution and distilled water wash, obtains diethanol monoisopropanolamine maleate compound.
Embodiment 3
A kind of enhanced cement grinding aid is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 58%, diethanol monoisopropanolamine 8%, carboxymethyl cellulose 5%, molasses 8%, and surplus is water, and solid content is 48%.
The enhanced cement grinding aid of the present embodiment is through the following steps that prepare: add water in reactor, it is heated to 40 DEG C, add carboxymethyl cellulose, stirring 30min, adds molasses, stirs 20min, it is cooled to room temperature, add diethanol monoisopropanolamine maleate compound, diethanol monoisopropanolamine, stir 15min, obtain enhanced cement grinding aid.
Diethanol monoisopropanolamine maleate compound prepares by the following method: be 1.0:1.4 according to the mol ratio of diethanol monoisopropanolamine and maleic anhydride adds diethanol monoisopropanolamine and maleic anhydride in reactor, add concentrated sulphuric acid or the p-methyl benzenesulfonic acid of 1.3%, carry out under stirring being decompressed to 0.4MPa, heating, temperature controls at 97 DEG C, maintenance system constant temperature, every acidity measuring a system every other hour, to acid number without significant change time reaction stop.It is subsequently cooled to room temperature, successively with saturated sodium carbonate solution and distilled water wash, obtains diethanol monoisopropanolamine maleate compound.
Embodiment 4
A kind of enhanced cement grinding aid is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 70%, diethanol monoisopropanolamine 5%, carboxymethyl cellulose 3%, molasses 5%, and surplus is water, and solid content is 59%.
The enhanced cement grinding aid of the present embodiment is through the following steps that prepare: add water in reactor, it is heated to 35 DEG C, add carboxymethyl cellulose, stirring 30min, adds molasses, stirs 20min, it is cooled to room temperature, add diethanol monoisopropanolamine maleate compound, diethanol monoisopropanolamine, stir 15min, obtain enhanced cement grinding aid.
Diethanol monoisopropanolamine maleate compound prepares by the following method: be 1.0:1.0 according to the mol ratio of diethanol monoisopropanolamine and maleic anhydride adds diethanol monoisopropanolamine and maleic anhydride in reactor, add concentrated sulphuric acid or the p-methyl benzenesulfonic acid of 1.5%, carry out under stirring being decompressed to 0.3MPa, heating, temperature controls at 100 DEG C, maintenance system constant temperature, every acidity measuring a system every other hour, to acid number without significant change time reaction stop.It is subsequently cooled to room temperature, successively with saturated sodium carbonate solution and distilled water wash, obtains diethanol monoisopropanolamine maleate compound.
Grinding-aid effect contrast test
Enhanced cement grinding aid in Example 1-4 is applied in grinding in the little mill of φ 500 × 500mm, same cement proportion: grog 70%, the natural gypsum 5%, flyash 14%, slag 11%.Cement granularity is affected distribution situation in Table 1 by cement grinding aid prepared by embodiment 1-4.According to the method test strength of cement mortar recorded in GB/T17671-1999 " Test method for strength of hydraulic cement mortar (ISO method) "；Adopt the ventilative ratio surface area instrument detection Blain specific surface of DBT-127 type Bo Shi；Stability according to the method detection cement recorded in GB/T1346-2001 " cement normal consistency water consumption, setting time, the stability method of inspection ".Result is as shown in table 2.
Cement granularity is affected distribution situation by table 1
Table 2 grinding aid uses front and back cement physical and mechanical properties contrast
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to aforementioned embodiment, it will be understood by those within the art that: the technical scheme described in aforementioned embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment of the present invention and specific embodiment technical scheme.
Claims (4)
1. an enhanced cement grinding aid, it is characterized in that, it is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 45-70%, diethanol monoisopropanolamine 5-10%, carboxymethyl cellulose 3-7%, molasses 5-10%, surplus is water；
Described grinding aid is through the following steps that prepare: add water in reactor, it is heated to 35-45 DEG C, add carboxymethyl cellulose, stirring 30min, adds molasses, stirs 20min, it is cooled to room temperature, add diethanol monoisopropanolamine maleate compound, diethanol monoisopropanolamine, stir 15min, obtain enhanced cement grinding aid；
Described diethanol monoisopropanolamine maleate compound prepares by the following method: add diethanol monoisopropanolamine and maleic anhydride in reactor, add catalyst, it is decompressed to 0.3-0.5MPa under stirring condition, heating, temperature controls at 90-100 DEG C, maintenance system constant temperature, often every other hour measure a system acidity, to acid number without significant change time reaction stop；It is subsequently cooled to room temperature, successively with saturated sodium carbonate solution and distilled water wash, obtains diethanol monoisopropanolamine maleate compound.
2. enhanced cement grinding aid according to claim 1, it is characterized in that, it is made up of the material of following mass percent: diethanol monoisopropanolamine maleate compound 58%, diethanol monoisopropanolamine 8%, carboxymethyl cellulose 5%, molasses 8%, surplus is water.
3. enhanced cement grinding aid according to claim 1, it is characterised in that the mol ratio of described diethanol monoisopropanolamine and maleic anhydride is 1.0:1.0-2.2.
4. enhanced cement grinding aid according to claim 1, it is characterised in that described catalyst is the concentrated sulphuric acid of volumetric concentration 98% or mass fraction is the p-methyl benzenesulfonic acid of 1.4%, and the addition of described catalyst is the 1.0-1.5% of the amount of substance of total reactant.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105461917B (en) * | 2015-11-13 | 2018-02-16 | 青神鑫统领建材有限公司 | Compatibility improvement agent and its production and use |
| CN105439491A (en) * | 2015-12-25 | 2016-03-30 | 湖南中岩建材科技有限公司 | Cement grinding aid and preparation method thereof |
| CN106336139A (en) * | 2016-08-25 | 2017-01-18 | 辽宁天宝华瑞建材有限公司 | End-capping diethanolisopropanolamine efficient cement grinding aid and preparation method thereof |
| CN106867064B (en) * | 2017-03-20 | 2018-04-13 | 山东宝力科技有限公司 | A kind of environmental friendly regenerated glue and its production method |
| CN107311502A (en) * | 2017-07-17 | 2017-11-03 | 日照弗尔曼新材料科技有限公司 | A kind of early-strength high-performance polycarboxylate water-reducer and preparation method thereof |
| CN109180055A (en) * | 2018-10-15 | 2019-01-11 | 山东鑫圭新材料科技有限公司 | A kind of polyether polyhydroxy tertiary amine cement grinding aid and preparation method thereof |
| CN111574094A (en) * | 2020-06-09 | 2020-08-25 | 辽宁利诺尔科技有限公司 | Grinding aid special for low-calcium-oxide clinker cement and application thereof |
| CN113003981B (en) * | 2021-04-19 | 2022-03-22 | 武汉三源特种建材有限责任公司 | Superfine composite mineral admixture grinding aid and preparation method thereof |
| CN115073039A (en) * | 2022-06-08 | 2022-09-20 | 北京金隅水泥节能科技有限公司 | Cement grinding aid and preparation method thereof |
| CN116023060A (en) * | 2022-12-30 | 2023-04-28 | 华新水泥股份有限公司 | Moisture-absorption-resistant caking cement grinding aid and preparation method thereof |
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