CN112047658A - Cement grinding aid, preparation method thereof and application thereof in interior decoration cement - Google Patents
Cement grinding aid, preparation method thereof and application thereof in interior decoration cement Download PDFInfo
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- CN112047658A CN112047658A CN202010963791.3A CN202010963791A CN112047658A CN 112047658 A CN112047658 A CN 112047658A CN 202010963791 A CN202010963791 A CN 202010963791A CN 112047658 A CN112047658 A CN 112047658A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/52—Grinding aids; Additives added during grinding
Abstract
The invention provides a cement grinding aid, a preparation method thereof and application thereof in interior decoration cement, and relates to the technical field of building materials. The cement grinding aid provided by the invention comprises the following components in percentage by mass: 11-15% of triethanolamine, 11-15% of diethanolisopropanolamine, 14-16% of polycarboxylic acid, 5-6% of sodium gluconate, 5-6% of polyethylene glycol and the balance of deionized water; the pH value of the cement grinding aid is 8.0-10. By controlling the composition and content of the raw materials, the provided cement grinding aid has good cement grinding aid effect, and also has the effects of enhancing, entraining air, reducing water and slowing coagulation, so that the workability, the fluidity and the cohesiveness of cement can be effectively improved, and the cement can meet the construction requirements of indoor decoration; in addition, the cement grinding aid provided by the invention is non-toxic and pollution-free, green and environment-friendly, and has a wide application prospect.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a cement grinding aid, a preparation method thereof and application thereof in interior decoration cement.
Background
The interior finishing works of buildings require the use of a large amount of cement. Because of the different properties of the interior decoration engineering and the building structure engineering, the quality requirements of the cement used by the interior decoration engineering and the building structure engineering are obviously different: the mechanical property and durability of cement are emphasized in building structure engineering, the requirements of indoor decoration engineering on the mechanical property and durability of cement are not high, but the requirements on the service performances of cement, such as workability, fluidity, air permeability, cohesiveness and the like, are high. In order to meet the demand, in recent years, many cement manufacturers have studied cement specially used for interior decoration (referred to as "interior decoration cement"), but the interior decoration cement has no unified national standard, and most of the cement used for interior decoration is composite portland cement (P.C cement).
The cement grinding aid is an important way for improving the performance of cement, is a grinding aid commonly used in the cement grinding process, and mainly has the functions of promoting the cement grinding process and effectively improving the cement grinding efficiency so as to achieve the purposes of increasing the yield and saving energy. Meanwhile, certain properties of the cement can be improved by adding grinding aids with different compositions and properties, and the cement strength is mainly increased at present. The cement grinding aid technology applied to the market at present is quite mature, the yield-increasing and energy-saving effects are also proved by a large number of production practices, but no grinding aid specially used for interior decoration cement is available so far.
Disclosure of Invention
In view of the above, the invention aims to provide a cement grinding aid, a preparation method thereof and application thereof in interior decoration cement. The cement grinding aid provided by the invention not only has good cement grinding aid effect, but also can effectively improve the workability, the fluidity, the air entraining property and the cohesiveness of cement, so that the cement meets the construction requirements of interior decoration.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a cement grinding aid which comprises the following components in percentage by mass:
the pH value of the cement grinding aid is 8.0-10; the mass ratio of the polycarboxylic acid to the polyethylene glycol is 2.8: 1-3.2: 1.
Preferably, the composition comprises the following components in percentage by mass:
preferably, the number average molecular weight of the polycarboxylic acid is 5000 to 10000.
Preferably, the number average molecular weight of the polyethylene glycol is 380-420.
The invention provides a preparation method of a cement grinding aid in the technical scheme, which comprises the following steps:
carrying out first mixing on deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol at normal temperature to obtain mixed feed liquid;
and heating the mixed material liquid to 90-95 ℃ for second mixing to obtain the cement grinding aid.
Preferably, the first mixing method is as follows: sequentially adding triethanolamine, diethanolisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol into deionized water, and stirring and mixing after adding each raw material; the speed of stirring and mixing each time is independently 15-20 r/min, and the time of stirring and mixing each time is independently 15-20 min.
Preferably, the second mixing is carried out under the condition of stirring, and the stirring speed is 15-20 r/min; the second mixing time is 2-3 h.
The invention provides the application of the cement grinding aid prepared by the technical scheme or the cement grinding aid prepared by the preparation method in the technical scheme in indoor decoration cement.
Preferably, the interior decoration cement is composite portland cement; the doping amount of the cement grinding aid in the composite Portland cement is 0.03-0.08 wt%.
Preferably, the preparation method of the interior decoration cement comprises the following steps: and adding the cement grinding aid into the composite portland cement batch, and then, grinding in a ball mill.
The invention provides a cement grinding aid which comprises the following components in percentage by mass: 11-15% of triethanolamine, 11-15% of diethanolisopropanolamine, 14-16% of polycarboxylic acid, 5-6% of sodium gluconate, 5-6% of polyethylene glycol and the balance of deionized water; the pH value of the cement grinding aid is 8.0-10; the mass ratio of the polycarboxylic acid to the polyethylene glycol is 2.8: 1-3.2: 1. In the invention, carboxyl groups in the structure of the polycarboxylic acid graft polymer can be directionally adsorbed on the surface of cement particles, so that the polycarboxylic acid graft polymer plays a role in dispersing the particles and is beneficial to improving the grinding efficiency of cement; in the cement concrete mortar, the polycarboxylic acid has the effects of low air entraining, slow setting and water reducing, and can obviously improve the workability of cement; according to the invention, the mass content of the polycarboxylic acid is controlled to be 14-16%, and the construction performance of the cement can be obviously improved on the basis of ensuring the grinding aid effect of the grinding aid to the greatest extent; the polycarboxylic acid is very sensitive to the mud content of sand and stone in cement concrete, and the effect of the polycarboxylic acid can be greatly weakened under the condition of high sand and stone mud content. In the invention, the triethanolamine, the diethanol monoisopropanolamine and the polyethylene glycol have dispersibility, have a grinding-assisting effect in the cement grinding process and can increase the strength of cement; the sodium gluconate has the function of adjusting the setting time (retarding) of the cement and can also increase the strength of the cement. By controlling the composition and content of the raw materials, the provided cement grinding aid has good cement grinding aid effect, and also has the effects of enhancing, entraining air, reducing water and slowing coagulation, so that the workability, the fluidity and the cohesiveness of cement can be effectively improved, and the cement can meet the construction requirements of indoor decoration; in addition, the cement grinding aid provided by the invention is non-toxic and pollution-free, green and environment-friendly, and has a wide application prospect.
The invention provides a preparation method of the cement grinding aid, which is simple in process, easy to operate and beneficial to large-scale production.
Drawings
FIG. 1 is a photograph of a blank cement mortar;
FIG. 2 is a photograph of an actual drawing of a cement mortar doped with the cement grinding aid of comparative example 3(HX-211 high Performance cement grinding aid);
FIG. 3 is a photograph of a cement mortar incorporating the finishing cement grinding aid of example 2 (15 wt% polycarboxylic acid);
FIG. 4 is an apparent effect of blank cement on a wall surface after being smoothed for 30 min;
FIG. 5 is the apparent effect of cement doped with the grinding aid of comparative example 3(HX-211 high efficiency cement grinding aid) 30min after wall screeding;
FIG. 6 is the apparent effect of cement doped with the grinding aid of example 2 (15 wt% polycarboxylic acid) on wall surface leveling 30min later.
Detailed Description
The invention provides a cement grinding aid which comprises the following components in percentage by mass:
the pH value of the cement grinding aid is 8.0-10; the mass ratio of the polycarboxylic acid to the polyethylene glycol is 2.8: 1-3.2: 1.
Unless otherwise specified, the starting materials used in the present invention are all commercially available products well known to those skilled in the art.
The cement grinding aid provided by the invention comprises 11-15% of triethanolamine, preferably 11.5-14%, and more preferably 12-13% by mass. In the embodiment of the invention, the triethanolamine is industrial-grade triethylamine, and the mass content of the industrial-grade triethanolamine is 85%; the addition amount of the industrial triethanolamine meets the content requirement of the triethanolamine, and the corresponding addition amount of the industrial triethanolamine is 13-17%. In the invention, the triethanolamine has dispersibility, plays a role in grinding aid in the cement grinding process and can increase the strength of cement.
The cement grinding aid provided by the invention comprises, by mass, 11-15% of diethanol monoisopropanolamine, preferably 11.5-14%, and more preferably 12-13%. In the embodiment of the invention, the diethanol monoisopropanolamine is industrial-grade diethanol monoisopropanolamine, and the mass content of the industrial-grade diethanol monoisopropanolamine is 85%; the addition amount of the industrial-grade diethanol monoisopropanolamine is 13-17 wt% based on meeting the content requirement of the diethanol monoisopropanolamine. In the invention, the diethanol monoisopropanolamine has dispersibility, plays a grinding-assisting role in the cement grinding process and can increase the strength of cement.
The cement grinding aid provided by the invention comprises 14-16% by mass of polycarboxylic acid, and preferably 15-16%. In the present invention, the number average molecular weight of the polycarboxylic acid is preferably 5000 to 10000, and more preferably 6000 to 8000. In the embodiment of the invention, the polycarboxylic acid is industrial-grade polycarboxylic acid, and the mass content of the industrial-grade polycarboxylic acid is 50%; the addition amount of the industrial grade polycarboxylic acid is 28-32 wt% based on the requirement of the content of the polycarboxylic acid. In the invention, the carboxyl (-COOH) in the structure of the polycarboxylic acid graft polymer can be directionally adsorbed on the surface of cement particles in the cement grinding process, so that the polycarboxylic acid graft polymer plays a role in dispersing the particles and is beneficial to improving the grinding efficiency of cement. In the invention, the polycarboxylic acid with the mass percentage of 14-16% can obviously improve the workability of the decoration cement and improve the construction performance of the decoration cement.
The cement grinding aid provided by the invention comprises 5-6% of polyethylene glycol, preferably 5-5.5%, and more preferably 5-5.3% by mass. In the invention, the number average molecular weight of the polyethylene glycol is preferably 380-420, and more preferably 400-410; the mass ratio of the polycarboxylic acid to the polyethylene glycol is 2.8: 1-3.2: 1, and preferably 2.8-3: 1. In the embodiment of the invention, the polyethylene glycol is industrial grade, and the content is 99%. In the invention, because the polycarboxylic acid is very sensitive to the mud content of sand and stone in cement concrete, and the action of the polycarboxylic acid can be greatly weakened under the condition of higher sand and stone mud content, the polyethylene glycol with remarkable mud resistance is introduced into the cement grinding aid to inhibit the weakening action of the mud content in the sand and stone on the polycarboxylic acid, and in addition, the polyethylene glycol also has dispersibility, has good grinding aid effect in the cement grinding process, and can increase the strength of cement.
The cement grinding aid provided by the invention comprises 5-6% of sodium gluconate, preferably 5-5.5%, and more preferably 5-5.3% by mass. In the embodiment of the invention, the sodium gluconate carbonate is of industrial grade and has the content of 99%. In the invention, the sodium gluconate has the function of adjusting the setting time of the cement and can also increase the strength of the cement.
The cement grinding aid provided by the invention comprises the balance of deionized water in percentage by mass. In the conventional cement grinding aid, the used medium water is usually tap water, and the tap water often contains various impurity ions, such as calcium ions and chloride ions, when the ions are blended with other grinding aid components, various complex chemical reactions can occur and corresponding impurities are formed, and the presence of the impurities can reduce the content of active ingredients of the grinding aid and can also cause blockage of a grinding aid metering pump, so that the grinding aid is not metered correctly. The invention adopts deionized water as medium water, which can avoid the situations.
In the invention, the pH value of the cement grinding aid is preferably 8.5-9.5; the pH value is adjusted by the adding amount of each component.
By controlling the composition and content of the raw materials, the provided cement grinding aid has good cement grinding aid effect, and also has the effects of enhancing, entraining air, reducing water and slowing coagulation, so that the workability, the fluidity and the cohesiveness of cement can be effectively improved, and the cement can meet the construction requirements of indoor decoration; in addition, the cement grinding aid provided by the invention is non-toxic and pollution-free, green and environment-friendly, and has a wide application prospect.
The invention provides a preparation method of a cement grinding aid in the technical scheme, which comprises the following steps:
carrying out first mixing on deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol at normal temperature to obtain mixed feed liquid;
and heating the mixed material liquid to 90-95 ℃ for second mixing to obtain the cement grinding aid.
The method comprises the steps of mixing deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol at normal temperature to obtain a mixed feed liquid. In the present invention, the first mixing method is preferably: sequentially adding triethanolamine, diethanolisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol into deionized water, and stirring and mixing after adding each raw material; the speed of each stirring and mixing is preferably 15-20 r/min independently, and the time of each stirring and mixing is preferably 15-20 min independently. The invention pre-mixes the components at normal temperature.
After the mixed material liquid is obtained, heating the mixed material liquid to 90-95 ℃ for second mixing to obtain the cement grinding aid. In the invention, the temperature of the second mixing is preferably 92-93 ℃, and the time is preferably 2-3 h, and more preferably 2.5 h; the second mixing is preferably carried out under the condition of stirring, and the stirring speed is preferably 15-20 r/min. The mixed material liquid is heated to 90-95 ℃, so that the components are fully mixed. After the second mixing, it is preferably naturally cooled to room temperature.
The preparation method of the cement grinding aid provided by the invention is simple in process, easy to operate and beneficial to large-scale production.
The invention provides the application of the cement grinding aid prepared by the technical scheme or the cement grinding aid prepared by the preparation method in the technical scheme in indoor decoration cement. The cement grinding aid provided by the invention has good cement grinding aid effect, and also has the effects of enhancing, air entraining, water reducing and coagulation delaying, so that the workability, the fluidity and the cohesiveness of cement can be effectively improved, and the cement can meet the construction requirements of indoor decoration. In the invention, the interior decoration cement is preferably composite portland cement, and the doping amount of the cement grinding aid in the composite portland cement is preferably 0.03-0.08 wt%, and more preferably 0.04-0.06 wt%. In the present invention, the preparation method of the interior cement is preferably: and adding the cement grinding aid into the composite portland cement batch, and then, grinding in a ball mill. In the invention, the composite portland cement batch is the blocky composite portland cement before grinding, and the invention has no special requirement on the composite portland cement batch and only needs to adopt the composite portland cement batch well known by persons skilled in the art. The ball milling conditions of the invention have no special requirements, and the ball milling conditions of the ground cement which are well known to the technical personnel in the field can be adopted.
The cement grinding aid provided by the invention, the preparation method thereof and the application thereof in interior decoration cement are explained in detail by combining with the examples, but the cement grinding aid cannot be understood as limiting the protection scope of the invention.
In the following examples, all the interior decoration cements used were composite portland cements (P.C cement) of a cement company of Huarun group, and the mixing ratio (mass ratio) was: cement clinker, desulfurized gypsum, furnace slag, fly ash and limestone, 59.0:4.0:6.0:10.0: 27.0;
the sand for the decoration cement mortar is machine-made sand, the fineness modulus of the machine-made sand is 1.8, and the mud (powder) content is 10.0 wt%;
the specification of the raw materials for the cement grinding aid is as follows: industrial triethanolamine (85 wt%), industrial diethanol monoisopropanolamine (85 wt%), industrial polycarboxylic acid (molecular weight 5000-10000, 50 wt%), industrial sodium gluconate (99 wt%), and industrial polyethylene glycol (molecular weight 380-420, 99 wt%);
the physical property test of the cement adopts the following national standards:
a cement fineness test method screening method (GB/T1345-2005),
the water consumption, setting time and stability of the standard consistency of cement (GB/T1346-2005),
the cement mortar fluidity test standard (GB/T2419-,
a cement mortar strength test method (GB/T17671-1999),
a cement mortar water retention rate detection method (GB/T3183-2017),
a method for measuring the gas content of the mortar (JC/T601-2009).
Example 1
(1) Injecting measured normal-temperature deionized water into the reaction kettle;
(2) injecting industrial triethanolamine into a reaction kettle in a metering way, and stirring and mixing for 20min at a stirring speed of 15 r/min;
(3) injecting industrial-grade diethanol monoisopropanolamine into a reaction kettle in a metering manner, and stirring and mixing for 20min at a stirring speed of 15 r/min;
(4) injecting industrial polycarboxylic acid into a reaction kettle in a metering way, and stirring and mixing for 20min at a stirring speed of 15 r/min;
(5) injecting industrial sodium gluconate into the reaction kettle in a metering way, and stirring and mixing for 20min at a stirring speed of 15 r/min;
(6) injecting industrial-grade polyethylene glycol amine into a reaction kettle in a metering manner, and stirring and mixing for 20min at a stirring speed of 15 r/min;
(7) heating the mixed solution to 95 ℃, and stirring for 2 hours at a stirring speed of 15 r/min;
(8) naturally cooling to room temperature to obtain the decoration cement grinding aid, and filling the decoration cement grinding aid into a finished product tank by using a liquid pump.
The mass mixing ratio (mass mixing ratio after conversion of each industrial grade raw material into a corresponding pure product) of deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol is shown in table 1, and the pH value of the prepared decoration cement is 8-10.
Example 2
The decoration cement grinding aid is prepared according to the steps of example 1, except that the mass mixing ratio of deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol is shown in table 1, and the pH value of the prepared decoration cement is 8-10.
Example 3
The method is characterized in that the decoration cement grinding aid is prepared according to the steps of example 1, except that the mixing ratio of deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol is shown in table 1, and the pH value of the prepared decoration cement is 8-10.
Comparative example 1
The method is characterized in that the decoration cement grinding aid is prepared according to the steps of example 1, except that the mixing ratio of deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol is shown in table 1, and the pH value of the prepared decoration cement is 8-10.
Comparative example 2
The method is characterized in that the decoration cement grinding aid is prepared according to the steps of example 1, except that the mixing ratio of deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol is shown in table 1, and the pH value of the prepared decoration cement is 8-10.
Comparative example 3
A commercially available high performance cement grinding aid (model HX-211, from Hongxin).
Table 1 mixing proportion of each component in decoration cement grinding aid
In the cement grinding process, a mode of adding before a ball mill is adopted, the cement grinding aids of examples 1-3 and comparative examples 1-3 are respectively added into 3kg P.C cement by a cement grinding aid metering pump according to the doping amount of 0.06 wt%, and grinding is carried out for 22min, so as to obtain cement samples doped with the grinding aids, which are respectively marked as S1, S2, S3, S4, S5 and S6. And, a blank control group was set: 3kg of P.C cement was placed in a mill and ground for 22min to obtain a blank sample designated as S0.
The cement and related ingredients with different cement grinding aids incorporated are shown in table 2:
TABLE 2 Cement fineness and related Components with different Cement grinding aids
The data in table 2 show that:
(1) compared with a blank cement sample, the cement samples doped with the grinding aids of the examples 1 to 3 and the comparative examples 1 to 3 have the obviously reduced 80-micron screen residue and 45-micron screen residue and obviously improved specific surface area, which shows that the grinding aids of the examples 1 to 3 and the comparative examples 1 to 3 can effectively improve the cement grinding efficiency;
(2) the fineness of the cement sample doped with the grinding aid of comparative example 1 (13 wt% of polycarboxylic acid) is slightly different from that of the cement sample doped with the grinding aid of comparative example 3(HX-211 high-efficiency cement grinding aid), but the fineness of the corresponding cement sample becomes thicker as the mixing ratio of the grinding aid polycarboxylic acid is increased. Since an increase in the polycarboxylic acid mix ratio corresponds to a decrease in the mix ratio of triethanolamine and diethanol monoisopropanolamine, this indicates that the polycarboxylic acid has a poorer grinding aid than triethanolamine and diethanol monoisopropanolamine. However, when the content of the polycarboxylic acid in the grinding aid is 14-16 wt%, the fineness of the corresponding cement sample is not greatly changed.
The physical properties of the cement with different cement grinding aids incorporated are shown in table 3:
TABLE 3 physical Properties of cements with different Cement grinding aids
The data in table 3 show that:
(1) compared with a blank cement sample, the water consumption of the standard consistency of the cement sample doped with the grinding aids of the examples 1 to 3 and the comparative examples 1 to 3 is obviously reduced, the initial setting time and the final setting time are obviously prolonged, the fluidity and the air content of the mortar are obviously increased, and the strength of 3d and 28d is improved to different degrees;
(2) the 3d and 28d strength of the cement sample doped with the grinding aid (HX-211 high-efficiency cement grinding aid) in comparative example 3 is higher than that of the cement sample doped with the grinding aids in examples 1-3 and comparative examples 1-2, but the water consumption for standard consistency is higher, the setting time of the cement is not obviously prolonged, and the increase range of the mobility of mortar and the air content is not as large as that of the cement samples in examples 1-3 and comparative examples 1-2;
(3) the physical properties of the cement sample doped with the grinding aid of the comparative example 1 (13 wt% of polycarboxylic acid) are similar to those of the cement sample doped with the grinding aid of the comparative example 3(HX-211 high-efficiency cement grinding aid), and with the increase of the mixing ratio of the grinding aid polycarboxylic acid (examples 1-3 grinding aids), the 3d strength and the 28d strength of the corresponding cement sample are reduced, but the water consumption for standard consistency is obviously reduced, and the initial setting time and the final setting time are obviously prolonged; the fluidity and the air content of the mortar are obviously increased. This indicates that polycarboxylic acids have an important role in improving the flow properties of cement. And when the content of the polycarboxylic acid in the grinding aid is 17 wt%, the flowability of a corresponding cement sample is greatly improved, but the mechanical strength of the cement is obviously reduced.
FIG. 1, FIG. 2, and FIG. 3 are photographs of cement mortar for mixing blank cement, cement doped with the grinding aid of comparative example 3(HX-211 high Performance cement grinding aid), and cement doped with the grinding aid of example 2 (15 wt% polycarboxylic acid). It can be seen from the appearance that the mortar incorporating the grinding aid of example 2 was more uniform, saturated, thick and shiny, indicating good workability of the cement incorporating the finishing cement grinding aid of the present invention.
By combining the comparison of the fineness and the physical properties of the cement and the state of the mixed mortar, the decoration cement grinding aid (14-16 wt% of polycarboxylic acid) provided by the invention has little influence on the fineness of the cement, but can obviously improve the flow property and the construction property of the cement.
Example 4
Examples 1 to 3 are experimental data of a small laboratory mill, and in view of the great difference between working condition parameters of a laboratory mill and an industrial mill, example 4 is a test performed by a large cement mill (phi 4.2 × 13M cement grinding mill system of a certain cement company of huarun group), and tests of the cement grinding aids of examples 1 to 3 and comparative examples 1 to 3 show the effects of the cement grinding aids:
sending P.C cement into a cement grinding system for continuous grinding for 24 hours, taking an average mixed sample as a blank cement sample, and marking as A0;
the cement grinding aids of the examples 1 to 3 and the comparative examples 1 to 3 are respectively added into the cement, the adding amount of the cement grinding aids in the cement is 0.03 wt%, the same cement grinding operation as the blank cement is carried out, and the obtained cement samples doped with the grinding aids are respectively marked as A1, A2, A3, A4, A5 and A6.
The fineness of the cement doped with different cement grinding aids, the yield of the mill and the power consumption for grinding are shown in Table 4:
TABLE 4 Cement fineness, Mill output and grinding power consumption by adding cement grinding aid
The data in table 4 show that:
(1) when the cement fineness is basically the same, compared with the situation that the grinding aid is not doped, the yield of the mill doped with the grinding aid (HX-211 high-efficiency cement grinding aid) in the comparative example 3 is increased by 11.05 percent, and the yield of the mill doped with other cement grinding aids is increased by 5.59-10.07 percent;
(2) when the fineness of the cement is basically the same, the cement yield is reduced along with the increase of the mixing proportion of the polycarboxylic acid as the grinding aid, and when the polycarboxylic acid is 13 wt% (comparative example 1), the cement yield is only slightly reduced compared with that when the high-efficiency cement grinding aid HX-211 is added (comparative example 3); when the polycarboxylic acid is 17 wt% (comparative example 3), the decrease in cement production is significant; when the amount of the polycarboxylic acid is 14 to 16 wt% (examples 1 to 3), the cement yield is reduced, but is still about 9% higher than that of the blank sample.
The physical properties of the cement with different cement grinding aids incorporated are shown in table 5:
TABLE 5 physical Properties of cements incorporating Cement grinding aids of different polycarboxylic acid compounding ratios
The data in table 5 show that:
(1) the 3d and 28d strengths of the cement with the grinding aid incorporated were higher than those of the blank sample A0 (except for the grinding aid of comparative example 2); the cement strength of the cement grinding aids doped in the examples 1 to 3 and the comparative examples 1 to 2 is reduced to a different extent compared with the cement doped with the HX-211 high-efficiency cement grinding aid (comparative example 3). The experimental results of the output of the cement grinding mill and the mechanical properties of the cement show that the grinding aid and the cement reinforcing effect of the cement grinding aids added in the examples 1-3 and the comparative examples 1-2 are slightly inferior to those of the HX-211 high-efficiency cement grinding aid in the comparative example 3;
(2) the water consumption of the cement standard consistency doped with the cement grinding aids of the examples 1 to 3 and the comparative examples 1 to 2 is lower than that of the comparative example 3(HX-211 high-efficiency cement grinding aid), the initial setting time and the final setting time of the cement are obviously longer than those of the comparative example 3, the fluidity of cement mortar, the water retention rate of mortar and the gas content of mortar are also higher than those of the comparative example 3, and the water reducing performance and the cement fluidity of the cement grinding aids of the examples 1 to 3 and the comparative examples 1 to 2 are better than those of the HX-211 high-efficiency cement grinding aid, so that good basic conditions are provided for ensuring the quality of decoration construction engineering and improving the construction efficiency of the cement.
FIGS. 4, 5 and 6 show the apparent conditions of a blank cement, a cement doped with the grinding aid of comparative example 3(HX-211 high efficiency cement grinding aid) and a cement doped with the grinding aid of example 2 (15 wt% of polycarboxylic acid) 30min after the wall surface is smoothed. It can be seen that the cement mortar containing the cement grinding aid of example 2 has better mortar uniformity, flatness and wettability than the cement mortar containing blank cement and the high-efficiency cement grinding aid HX-211, and the cement mortar containing the cement grinding aid of example 2 has stronger cohesiveness and is not easy to fall off when applied to wall. This shows that the cement doped with the decorative cement grinding aid of the invention has good workability, mortar water retention and cohesiveness.
Compared with the cement mill output and the cement physical property comprehensively, the decoration cement grinding aid (the polycarboxylic acid is 14-16 wt%) provided by the invention has a slightly inferior grinding aid effect to that of the HX-211 high-efficiency cement grinding aid, but can obviously improve the workability and the construction performance of the cement, so that the cement can well meet the construction requirements of indoor decoration.
The above examples show that the cement grinding aid provided by the invention has the effects of enhancing, introducing air, reducing water and slowing coagulation besides good cement grinding aid effect by controlling the composition and content of the raw materials, and can effectively improve the workability, fluidity and cohesiveness of cement, so that the cement meets the construction requirements of indoor decoration.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The cement grinding aid is characterized by comprising the following components in percentage by mass:
the pH value of the cement grinding aid is 8.0-10.0; the mass ratio of the polycarboxylic acid to the polyethylene glycol is 2.8: 1-3.2: 1.
2. The cement grinding aid as claimed in claim 1, which is characterized by comprising the following components in percentage by mass:
3. the cement grinding aid according to claim 1 or 2, wherein the polycarboxylic acid has a number average molecular weight of 5000 to 10000.
4. The cement grinding aid as claimed in claim 1 or 2, wherein the polyethylene glycol has a number average molecular weight of 380 to 420.
5. The preparation method of the cement grinding aid as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
carrying out first mixing on deionized water, triethanolamine, diethanol monoisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol at normal temperature to obtain mixed feed liquid;
and heating the mixed material liquid to 90-95 ℃ for second mixing to obtain the cement grinding aid.
6. The method of manufacturing according to claim 5, wherein the first mixing method is: sequentially adding triethanolamine, diethanolisopropanolamine, polycarboxylic acid, sodium gluconate and polyethylene glycol into deionized water, and stirring and mixing after adding each raw material; the speed of stirring and mixing each time is independently 15-20 r/min, and the time of stirring and mixing each time is independently 15-20 min.
7. The preparation method according to claim 5, wherein the second mixing is carried out under stirring at a speed of 15 to 20 r/min; the second mixing time is 2-3 h.
8. The cement grinding aid as defined in any one of claims 1 to 4 or the cement grinding aid prepared by the preparation method as defined in any one of claims 5 to 7, for use in interior decoration cement.
9. Use according to claim 8, wherein the interior cement is a composite portland cement; the doping amount of the cement grinding aid in the composite Portland cement is 0.03-0.08 wt%.
10. Use according to claim 8 or 9, characterized in that the interior finishing cement is prepared by: and adding the cement grinding aid into the composite portland cement batch, and then, grinding in a ball mill.
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| CN115093137A (en) * | 2022-06-23 | 2022-09-23 | 湖南格林朗科技有限公司 | Cement grinding aid and preparation method thereof |
| CN115181544A (en) * | 2022-07-01 | 2022-10-14 | 惠州市鑫业建材有限公司 | Grinding additive of blocky lime and lime grinding method |
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