CN104311754A - Method for quickly preparing high-concentration polycarboxylate water reducing agent at room temperature - Google Patents
Method for quickly preparing high-concentration polycarboxylate water reducing agent at room temperature Download PDFInfo
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- CN104311754A CN104311754A CN201410562783.2A CN201410562783A CN104311754A CN 104311754 A CN104311754 A CN 104311754A CN 201410562783 A CN201410562783 A CN 201410562783A CN 104311754 A CN104311754 A CN 104311754A
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Abstract
The invention provides a method for quickly preparing a high-concentration polycarboxylate water reducing agent at room temperature. The method comprises the following steps: mixing a monomer raw material with a photoinitiator, a chain transfer agent and a promoter, and then dissolving the mixture in distilled water to prepare a reaction solution with the mass concentration of 50-80%; and fully stirring the obtained reaction solution uniformly, then irradiating the reaction solution for 10-60 minutes under a high-voltage mercury lamp, and adjusting the pH value of a copolymerization product obtained after irradiation to be 7-8, wherein the monomer raw material is a mixture of two monomers including acrylic acid and iso-pentenol polyoxyethylene ether. By adopting the method provided by the invention, heating is not needed during reaction, the production cycle of the method is shorter than that of a conventional thermal polymerization method, and the high-concentration polycarboxylate water reducing agent of which the mass concentration is over 60% can be directly prepared, so that the method is an efficient and energy-saving new method.
Description
[technical field]
The present invention relates to a kind of method that room temperature prepares high density polycarboxylate water-reducer fast.
[background technology]
Polycarboxylate water-reducer is the third generation high-performance water reducing agent of widespread use in modern concrete.At present, the concentration of domestic and international polycarboxylate superplasticizer mother liquor is general all about 20 ~ 40%, its preparation technology's many employings thermal-initiated polymerization mode, and the production cycle is usually at more than 4h.If increase the synthesis concentration of polycarboxylate water-reducer further, easily cause rate of polymerization to be difficult to control, thus affect the performance of product.The exploitation of high density polycarboxylate water-reducer is to enhancing productivity, and reduce transportation cost, enhancing one's market competitiveness seems is even more important.In addition, the exploitation of high density polycarboxylate water-reducer, to improving the production efficiency of powder polycarboxylic acids water reducing agent, promote the development of dry-mix, blasting materials and injection material also tool be of great significance.
Current high density polycarboxylate water-reducer is prepared mainly through physics or chemical process.As adopted vacuum take-off technique, the moisture in removing lower concentration polycarboxylate water-reducer, can obtain concentration about 60% product, but the production efficiency of vacuum take-off is low, and energy consumption is large.And chemical process is directly polymerized under high density environment.
Such as; the applying date is 2010.12.31; application publication number is the preparation method that the Chinese patent of CN102101906A proposes a kind of acid amides/imide-type high density poly carboxylic acid series water reducer; the method makes unitary hydramine and unsaturated acid anhydride generation acylation reaction under 80 ~ 110 DEG C of conditions; then at 100 ~ 130 DEG C, pol yalkylene glycol monoalkyl ether and unsaturated acid are reacted 1 ~ 3h and obtain esterification products, finally reheat the copolymerization product that reaction obtains 70 ~ 85% concentration for 2 ~ 4 hours.
The applying date is 2012.03.29, application publication number is the preparation method that the Chinese patent of CN102627743A discloses a kind of high density polycarboxylate water-reducer, its preparation technology also comprises esterification and polymerization two steps, esterification needs to carry out under 110 ~ 120 DEG C of conditions, and Acrylic Acid Monomer and initiator need to drip respectively, for up to 1.5 ~ 2h, dropwise insulation 1 ~ 2h, finally also have the process that cools of long period.
Can find out that above-mentioned high density polycarboxylate water-reducer all adopts two-step synthesis method, there is production cycle long, the shortcoming such as kick off temperature is high, technique is loaded down with trivial details.On the basis of the above, the Chinese patent that the applying date is 2012.10.19, application publication number is CN102875746A discloses a kind of direct preparation method of high density ethers poly carboxylic acid series water reducer, its preparation to contain modified polyether and vinylformic acid, the molecular weight regulator of unsaturated double-bond, caused be polymerized under 50 ~ 70 DEG C of conditions by free radical.The method adopts modified polyether polymeric monomer to substitute esterification polymeric monomer and produces, and enormously simplify preparation technology, can obtain the polycarboxylate superplasticizer mother liquor of higher concentration, but still there is the problem that Heating temperature is high, polymerization time is long, energy consumption is large.
[summary of the invention]
The technical problem to be solved in the present invention, be to provide a kind of room temperature to prepare the method for high density polycarboxylate water-reducer fast, the method reaction process does not need heating, shorter than traditional thermal polymerization method production cycle, and can preparation quality concentration be directly the high density polycarboxylate water-reducer of more than 60%.
The present invention is achieved in that
Room temperature prepares a method for high density polycarboxylate water-reducer fast, comprises the following steps:
(1) be dissolved in distilled water after raw material monomer being mixed with light trigger, chain-transfer agent, promotor, be mixed with the reaction soln of mass concentration 50% ~ 80%;
(2) stirred by the reaction soln of above-mentioned gained and be placed on irradiation 10 ~ 60min under high voltage mercury lamp, the pH of the copolymerization product obtained after being terminated by irradiation is adjusted to 7 ~ 8;
Described raw material monomer is the mixture of vinylformic acid and isopentenol polyoxyethylene ether two kinds of monomers.
Further, described light trigger is alpha-hydroxyalkyl benzophenone derivatives.
Further, described light trigger is at least one in 1-hydroxycyclohexylphenylketone, 2-hydroxyl-4-(2-hydroxy ethoxy)-2-methyl phenyl ketone and 2-hydroxyl-1,2-diphenylethan.
Further, described chain-transfer agent is at least one in mercaptoethanol, thiohydracrylic acid and methylpropene sodium sulfonate.
Further, described promotor is at least one in monoethanolamine, diethanolamine and methyldiethanolamine.
Further, described high voltage mercury lamp power is 300W ~ 1000W.
Further, the irradiation time of described high voltage mercury lamp is 30min.
Further, the mol ratio of described Acrylic Acid Monomer and isopentenol polyoxyethylene ether monomer is (2.5 ~ 5): 1; With two kinds of monomer total masses for benchmark, described light trigger volume is 0.1 ~ 0.3%; Chain-transfer agent volume is 0.1 ~ 1%; Promotor volume is 0.1 ~ 3%.
Tool of the present invention has the following advantages:
1. existing ordinary method needs steam or boiler heating, and the inventive method can be carried out at ambient temperature, does not need extra heating, saves energy consumption;
2. the polymerization time of existing ordinary method reaches 3.5 ~ 4h, and polymerization terminate after also need to cool for a long time, the inventive method only needs 10 ~ 60min, greatly Reaction time shorten, enhances productivity.
3. the inventive method adopts high voltage mercury lamp irradiation, does not need fire coal, does not produce any waste residue waste gas, and the low carbonization achieving polycarboxylate water-reducer is produced.
In a word, the inventive method does not only need extra heating, and obviously can shorten polymerization time, and at room temperature getting final product the high density polycarboxylate water-reducer that preparation quality concentration is more than 60%, is a kind of efficient, energy-conservation novel method.
[accompanying drawing explanation]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the Irgacure2959 ultra-violet absorption spectrum of the embodiment of the present invention 1.
Fig. 2 is the infrared spectrum of polycarboxylate water-reducer prepared by the embodiment of the present invention 1.
Fig. 3 is the GPC spectrogram of polycarboxylate water-reducer prepared by the embodiment of the present invention 1.
[embodiment]
The present invention relates to a kind of method that room temperature prepares high density polycarboxylate water-reducer fast, comprise the following steps:
(1) be dissolved in distilled water after raw material monomer being mixed with light trigger, chain-transfer agent, promotor, be mixed with the reaction soln of mass concentration 50% ~ 80%;
(2) stirred by the reaction soln of above-mentioned gained and be placed on irradiation 10 ~ 60min under high voltage mercury lamp, the pH of the copolymerization product obtained after being terminated by irradiation is adjusted to 7 ~ 8;
Described raw material monomer is the mixture of vinylformic acid and isopentenol polyoxyethylene ether two kinds of monomers.
Described light trigger is alpha-hydroxyalkyl benzophenone derivatives.
Preferably, described light trigger is at least one in 1-hydroxycyclohexylphenylketone, 2-hydroxyl-4-(2-hydroxy ethoxy)-2-methyl phenyl ketone and 2-hydroxyl-1,2-diphenylethan.
Described chain-transfer agent is at least one in mercaptoethanol, thiohydracrylic acid and methylpropene sodium sulfonate.
Described promotor is at least one in monoethanolamine, diethanolamine and methyldiethanolamine.
Described high voltage mercury lamp power is 300W ~ 1000W.
Preferably, the irradiation time of described high voltage mercury lamp is 30min.
The mol ratio of described Acrylic Acid Monomer and isopentenol polyoxyethylene ether monomer is (2.5 ~ 5): 1; With two kinds of monomer total masses for benchmark, described light trigger volume is 0.1 ~ 0.3%; Chain-transfer agent volume is 0.1 ~ 1%; Promotor volume is 0.1 ~ 3%.
For a better understanding of the present invention, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to following examples.
One, polycarboxylate water-reducer is prepared under room temperature
Embodiment 1
Room temperature prepares a method for high density polycarboxylate water-reducer fast, comprises the following steps:
(1) 100g isopentenol polyoxyethylene ether, 7.6g vinylformic acid and 0.11g Irgacure2959 (2-hydroxyl-4-(2-hydroxy ethoxy)-2-methyl phenyl ketone), 0.18g thiohydracrylic acid, 0.11g methyldiethanolamine are dissolved in 110g distilled water, are mixed with the reaction soln of 50% mass concentration.
(2) being stirred by the reaction soln of above-mentioned gained and be placed on irradiation 30min under 1000W high pressure pumping lamp, is 7 ~ 8 with sodium hydroxide solution by the pH regulator of resulting polymers solution after polyreaction completes.
Note: isopentenol polyoxyethylene ether molecular weight is 2400, and commodity are called F-1088
The principle of above-mentioned reaction is as follows:
High pressure pumping lamp irradiation produces the UV-light of 200 ~ 360nm, after Irgacure2959 light trigger absorbs luminous energy, there is α-cracking, generate the free radical that two kinds have initiating activity, thus cause vinylformic acid and isopentenol polyoxyethylene ether unsaturated monomer generation Raolical polymerizable.
Above-mentioned reaction equation is as follows:
Light to initiator molecule excite and ionizing event depends on the wavelength of incident light consumingly, Irgacure2959 ultra-violet absorption spectrum is as shown in Figure 1.It can thus be appreciated that, Irgacure2959 to the maximum adsorption wavelength of UV-light at about 220nm and 275nm, all in the wavelength region (200 ~ 360nm) that above-mentioned high pressure pumping lamp irradiation produces UV-light, thus this light trigger can high efficiency absorption luminous energy.
Adopt U.S. Thermo Nicolet company AVATAR370 type Fourier transformation infrared spectrometer, measured the infrared spectra of polycarboxylate water-reducer by KBr pressed disc method.Scanning wave-number range is 400-4000cm
-1, scanning times is 32 times, and gained infrared spectra as shown in Figure 2.As shown in Figure 2, at 3450cm
-1the absorption peak of left and right is the stretching vibration peak of associate hydrogen bond O-H in polycarboxylate water-reducer sample molecule; 2881cm
-1place is the stretching vibration peak of saturated C-H; 1726.8cm
-1for the contraction vibration peak of carbonyl C=O, 525cm
-1for the in-plane bending vibration peak of carboxylic acid C-C=O; 1150cm
-1for the stretching vibration peak of C-O-C.The existence of above-mentioned charateristic avsorption band demonstrates in the polycarboxylate water-reducer molecule of synthesis containing-COOH ,-OCH
2cH
2the groups such as O-,-OH, test result is consistent with the molecular structure of polycarboxylate water-reducer.
Agilent company gel permeation chromatograph of the U.S. (GPC) is adopted to measure molecular weight and the distribution thereof of synthesis polycarboxylate water-reducer sample.Polycarboxylate water-reducer sample, after GPC chromatographic column is separated, is detected by differential refraction detector, obtains GPC elution curve, as shown in Figure 3.Polycarboxylate water-reducer GPC elution curve prepared by thermal initiation generally contains two peaks, respectively representation polymer and unreacted polymeric monomer component.And this polycarboxylate water-reducer GPC spectrogram and Fig. 3 only have the maximum peak of a representation polymer, the polymeric monomer complete reaction in polycarboxylate water-reducer prepared by the method is described, there is very high monomer conversion.GPC adopts Shodex RI-71 type differential refraction detector, and determined wavelength is 210nm.Reference material is the polyoxyethylene glycol of a series of different molecular weight, calculates the number-average molecular weight Mn=28650 of polycarboxylate water-reducer, weight-average molecular weight Mw=63840, PDI=2.2.The transformation efficiency adopting chromatography to record Acrylic Acid Monomer is 99.8%.
Embodiment 2
Room temperature prepares a method for high density polycarboxylate water-reducer fast, comprises the following steps:
(1) 100g modified polyether, 9.1g vinylformic acid and 0.14gIrgacure184 (1-hydroxycyclohexylphenylketone), 1.3g methylpropene sodium sulfonate, 1g monoethanolamine are dissolved in 91.3g distilled water, are mixed with the reaction soln of 55% concentration.
(2) being stirred by the reaction soln of above-mentioned gained and be placed on irradiation 10min under 800W high pressure pumping lamp, is 7 ~ 8 with sodium hydroxide solution by the pH regulator of above-mentioned resulting polymers solution after polyreaction.
Embodiment 3
Room temperature prepares a method for high density polycarboxylate water-reducer fast, comprises the following steps:
(1) 100g modified polyether, 10.6g vinylformic acid and 0.17g st-yrax (2-hydroxyl-1,2-diphenylethan), 0.3g mercaptoethanol, 1.1g diethanolamine are dissolved in 75.5g distilled water, are mixed with the reaction soln of 60% concentration.
(2) being stirred by the reaction soln of above-mentioned gained and be placed on irradiation 30min under 500W high pressure pumping lamp, is 7 ~ 8 with sodium hydroxide solution by the pH regulator of above-mentioned resulting polymers solution after polyreaction.
Embodiment 4
Room temperature prepares a method for high density polycarboxylate water-reducer fast, comprises the following steps:
(1) 100g modified polyether, 12g vinylformic acid and 0.22gIrgacure2959,1.3g methylpropene sodium sulfonate, 1g methyldiethanolamine are dissolved in 61.8g distilled water, are mixed with the reaction soln of 65% concentration.
(2) being stirred by the reaction soln of above-mentioned gained and be placed on irradiation 40min under 1000W high pressure pumping lamp, is 7 ~ 8 with 40% sodium hydroxide solution by the pH regulator of above-mentioned resulting polymers solution after polyreaction.
Embodiment 5
Room temperature prepares a method for high density polycarboxylate water-reducer fast, comprises the following steps:
(1) 100g modified polyether, 13.6g vinylformic acid and 0.28gIrgacure184,0.15g thiohydracrylic acid, 3.4g methyldiethanolamine are dissolved in 49.8g distilled water, are mixed with the reaction soln of 70% concentration.
(2) being stirred by the reaction soln of above-mentioned gained and be placed on irradiation 50min under 1000W high pressure pumping lamp, is 7 ~ 8 with sodium hydroxide solution by the pH regulator of above-mentioned resulting polymers solution after polyreaction.
Embodiment 6
Room temperature prepares a method for high density polycarboxylate water-reducer fast, comprises the following steps:
(1) 100g modified polyether, 15.1g vinylformic acid and 0.35gIrgacure184,1.4g methylpropene sodium sulfonate, 1.1g methyldiethanolamine are dissolved in 29.5g distilled water, are mixed with the reaction soln of 80% concentration.
(2) being stirred by the reaction soln of above-mentioned gained and be placed on irradiation 60min under 300W high pressure pumping lamp, is 7 ~ 8 with sodium hydroxide solution by the pH regulator of above-mentioned resulting polymers solution after polyreaction.
Two, Application Example
Be applied in cement slurry to the polycarboxylate water-reducer of above 6 embodiments synthesis, test its dispersion effect to cement slurry.Flowing degree of net paste of cement test is tested according to GB/T8077-2000 " Methods for testing uniformity of concrete admixture ".Concrete application method is: the new 42.5 ordinary Portland cement 300g of China, and polycarboxylate water-reducer volume is 0.11% of cement quality, and water cement ratio is 0.29, and test in contrast with commercially available polycarboxylate water-reducer sample, test result is as shown in table 1 below simultaneously.
Table 1 cement paste test result
As can be seen from Table 1, polycarboxylate water-reducer prepared by the inventive method all has good dispersing property to cement slurry, and initial and 1h paste flowing degree can meet or exceed polycarboxylate water-reducer prepared by thermal initiation.
In summary, tool of the present invention has the following advantages:
1. existing ordinary method needs steam or boiler heating, and the inventive method can be carried out at ambient temperature, does not need extra heating, saves energy consumption;
2. the polymerization time of existing ordinary method reaches 3.5 ~ 4h, and polymerization terminate after also need to cool for a long time, the inventive method only needs 10 ~ 60min, greatly Reaction time shorten, enhances productivity.
3. the inventive method adopts high voltage mercury lamp irradiation, does not need fire coal, does not produce any waste residue waste gas, and the low carbonization achieving polycarboxylate water-reducer is produced.
In a word, the inventive method does not only need extra heating, and obviously can shorten polymerization time, and at room temperature (20 ~ 30 DEG C) get final product the high density polycarboxylate water-reducer that preparation quality concentration is more than 60%, are a kind of efficient, energy-conservation novel methods.
Although the foregoing describe the specific embodiment of the present invention; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present invention; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present invention and change, should be encompassed in scope that claim of the present invention protects.
Claims (8)
1. room temperature prepares a method for high density polycarboxylate water-reducer fast, it is characterized in that: comprise the following steps:
(1) be dissolved in distilled water after raw material monomer being mixed with light trigger, chain-transfer agent, promotor, be mixed with the reaction soln of mass concentration 50% ~ 80%;
(2) stirred by the reaction soln of above-mentioned gained and be placed on irradiation 10 ~ 60min under high voltage mercury lamp, the pH of the copolymerization product obtained after being terminated by irradiation is adjusted to 7 ~ 8;
Described raw material monomer is the mixture of vinylformic acid and isopentenol polyoxyethylene ether two kinds of monomers.
2. a kind of room temperature according to claim 1 prepares the method for high density polycarboxylate water-reducer fast, it is characterized in that: described light trigger is alpha-hydroxyalkyl benzophenone derivatives.
3. a kind of room temperature according to claim 2 prepares the method for high density polycarboxylate water-reducer fast, it is characterized in that: described light trigger is at least one in 1-hydroxycyclohexylphenylketone, 2-hydroxyl-4-(2-hydroxy ethoxy)-2-methyl phenyl ketone and 2-hydroxyl-1,2-diphenylethan.
4. a kind of room temperature according to claim 1 prepares the method for high density polycarboxylate water-reducer fast, it is characterized in that: described chain-transfer agent is at least one in mercaptoethanol, thiohydracrylic acid and methylpropene sodium sulfonate.
5. a kind of room temperature according to claim 1 prepares the method for high density polycarboxylate water-reducer fast, it is characterized in that: described promotor is at least one in monoethanolamine, diethanolamine and methyldiethanolamine.
6. a kind of room temperature according to claim 1 prepares the method for high density polycarboxylate water-reducer fast, it is characterized in that: described high voltage mercury lamp power is 300W ~ 1000W.
7. a kind of room temperature according to claim 1 prepares the method for high density polycarboxylate water-reducer fast, it is characterized in that: the irradiation time of described high voltage mercury lamp is 30min.
8. a kind of room temperature according to any one of Claims 1 to 5 prepares the method for high density polycarboxylate water-reducer fast, it is characterized in that: the mol ratio of described Acrylic Acid Monomer and isopentenol polyoxyethylene ether monomer is (2.5 ~ 5): 1; With two kinds of monomer total masses for benchmark, described light trigger volume is 0.1 ~ 0.3%; Chain-transfer agent volume is 0.1 ~ 1%; Promotor volume is 0.1 ~ 3%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105778014A (en) * | 2016-02-17 | 2016-07-20 | 武汉源锦科技股份有限公司 | Method for preparing high-solid content polycarboxylate superplasticizer |
| CN105820298A (en) * | 2016-04-12 | 2016-08-03 | 江苏中铁奥莱特新材料有限公司 | Photo-initiation type polycarboxylic acid water reducing agent and preparation method thereof |
| WO2019128690A1 (en) * | 2017-12-28 | 2019-07-04 | 科之杰新材料集团有限公司 | Preparation method for high slump-retention polycarboxylic acid water reducing agent |
| CN112708049A (en) * | 2020-08-24 | 2021-04-27 | 重庆建研科之杰建材有限公司 | Concrete slump retaining agent and preparation method thereof |
| CN112708050A (en) * | 2020-08-24 | 2021-04-27 | 重庆建研科之杰建材有限公司 | Concrete water reducing agent and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101289293A (en) * | 2008-06-13 | 2008-10-22 | 北京工业大学 | Polycarboxylic acids anti-freeze agent for cement concrete and method for preparing same |
| CN103275279A (en) * | 2013-06-08 | 2013-09-04 | 武汉江北创新科技有限公司 | Method for producing polycarboxylate superplasticizer through one-off batch charging at normal temperature |
| CN103865000A (en) * | 2014-03-19 | 2014-06-18 | 武汉理工大学 | Method for preparing polymaleic anhydride water reducing agent through rapid polymerization initiated by ultraviolet light |
-
2014
- 2014-10-21 CN CN201410562783.2A patent/CN104311754B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101289293A (en) * | 2008-06-13 | 2008-10-22 | 北京工业大学 | Polycarboxylic acids anti-freeze agent for cement concrete and method for preparing same |
| CN103275279A (en) * | 2013-06-08 | 2013-09-04 | 武汉江北创新科技有限公司 | Method for producing polycarboxylate superplasticizer through one-off batch charging at normal temperature |
| CN103865000A (en) * | 2014-03-19 | 2014-06-18 | 武汉理工大学 | Method for preparing polymaleic anhydride water reducing agent through rapid polymerization initiated by ultraviolet light |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105778014A (en) * | 2016-02-17 | 2016-07-20 | 武汉源锦科技股份有限公司 | Method for preparing high-solid content polycarboxylate superplasticizer |
| CN105778014B (en) * | 2016-02-17 | 2019-04-02 | 武汉源锦建材科技有限公司 | A kind of preparation method of large arch dam polycarboxylate water-reducer |
| CN105820298A (en) * | 2016-04-12 | 2016-08-03 | 江苏中铁奥莱特新材料有限公司 | Photo-initiation type polycarboxylic acid water reducing agent and preparation method thereof |
| WO2019128690A1 (en) * | 2017-12-28 | 2019-07-04 | 科之杰新材料集团有限公司 | Preparation method for high slump-retention polycarboxylic acid water reducing agent |
| CN112708049A (en) * | 2020-08-24 | 2021-04-27 | 重庆建研科之杰建材有限公司 | Concrete slump retaining agent and preparation method thereof |
| CN112708050A (en) * | 2020-08-24 | 2021-04-27 | 重庆建研科之杰建材有限公司 | Concrete water reducing agent and preparation method thereof |
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