CN110156944A - Four arm starblock polycarboxylic acid super-plasticizers of one kind and its preparation method and application - Google Patents
Four arm starblock polycarboxylic acid super-plasticizers of one kind and its preparation method and application Download PDFInfo
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
- C08F299/026—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from the reaction products of polyepoxides and unsaturated monocarboxylic acids, their anhydrides, halogenides or esters with low molecular weight
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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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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Abstract
The invention discloses a kind of four arm starblock polycarboxylic acid super-plasticizers and its preparation method and application, the super plasticizer with tetrahydroxy molecule with containing halogenated carboxylic acid derivates first to be blocked, again using four arm molecules of halogen sealing end as structural core, using unconventional olefinically unsaturated carboxylic acid derivatives as the polymer of arm, by acidolysis and separating-purifying, a kind of four arm block super plasticizer of star is finally synthesized.The present invention does not use traditional unsaturated carboxylic acid polymerization, and the controllability of structure can be improved, reduce the irritation of unsaturated carboxylic acid in production.Water-reducing agent synthesized by the present invention has excellent molecular structure controllability.Product of the present invention is solid, has a low-dosage, polymolecularity, high fluidity, has a convenient transportation, storage, water absorption rate and the low feature of corrosivity.
Description
Technical field
The invention belongs to super plasticizer fields, and in particular to four arm starblock polycarboxylic acid super-plasticizers of one kind and its preparation
Methods and applications.
Background technique
Since polycarboxylate water-reducer (PCE) has the characteristics that volume is low, water-reducing rate is high (> 40%), coagulation can be significantly improved
Working performance, mechanical property and the endurance quality of soil, it has also become must not in high-performance or ultra-high performance concrete mix-design
One of the component that can lack.
Current industrial polycarboxylic acid series high-performance super plasticizer is mainly by the unsaturated monomer containing carboxyl and insatiable hunger
Formed with polyethers and other monomers by free-radical polymerized, be it is a kind of it is linear containing a large amount of carboxylate radicals, sulfonate radical, ammonium root,
The comb shaped structure polymer of the highly branched chain of polyether macromonomer.
And the angle that star carboxylic acid super plasticizer is then related to from molecular structure, change the structure of polymer molecular chain,
Polymerizable groups are introduced on a central element, then will be in corresponding monomer polymerization by polymerization reaction.
The research of star polycarboxylic acid super-plasticizer is focused primarily upon needed for the super plasticizer synthesis process at this stage
In the design for causing centerbody, traditional comb shape polycarboxylic acid super-plasticizer is different to prepare.
Such as, Shou Chongqi et al. (2011) is by synthesis N- ethoxy -3- amido-N, N- methyl propionate, then passes through transesterification
Brominated end group is introduced, finally by atom transfer radical polymerization is caused, obtains the polycarboxylic acid super-plasticizer of four arms, but it is lacked
Point is also it will be apparent that the non-conjugated brominated end group obtained by transesterification, the activity of the initiation polymerization of center primosome
It is low, cause polymerization process to lack what central element caused, heat causes autohemagglutination and occupies certain amount, cannot play very well and play star
The steric hindrance advantage that primosome provides.
Pei Jikai et al. (2018) is polymerize using bimetallic cyaniding complex catalytic epoxyethane, obtains high molecular weight isobutyl
Alkenyl polyoxyethylene ether, then possess star side chain with acrylic acid copolymer acquisition, the polymerization used remains traditional free
Base copolymerization, it is difficult to carry out the structure design of polymer, reactivity ratio still remains.
Chinese patent ZL 201610122451.1 discloses a kind of preparation method for preparing star poly carboxylic acid series water reducer,
Using polyalcohol and three monothioester containing carboxyl, two thio-acids etc. carry out esterification, obtain with the reversible chain tra nsfer of RAFT
The central compound of group, then by with unsaturated acids, polyethers copolymerization obtain structure-controllable poly carboxylic acid series water reducer, but by
Excessive in the alkyl group of three monothioesters that preparation uses etc., hydrophobicity is stronger, and solubility is lower in water, it is difficult to carry out chain and turn
Transposition control.
Chinese patent ZL 201610122454.5 discloses a kind of controllable star-like poly carboxylic acid series water reducer of molecular structure
Preparation method, the super plasticizer are reacted with the carboxylic acid halides with halogen end group by polyol, obtain and have polynary halogen end
The compound of base, then cause atom transfer radical polymerization on it, by methylpropene sodium sulfonate, allyl polyethenoxy ether,
Sodium Allyl Sulfonate, vinylbenzenesulfonic acid sodium, methallylsulfonic acid sodium, methoxyallyl sodium sulfonate, allyl sulphonic acid potassium,
The copolymerization of the copolymerizations such as styrene sulfonic acid potassium, vinyl sulfonic acid potassium, methallylsulfonic acid potassium, methyl allyloxy potassium sulfonate
Object, but it is limited to the dissolubility of different monomers and initiator and the complexing to metal ion of the group on polymer, molecule
Structure controllability is limited, but synthesized star-like polycarboxylate super plasticizer have volume is low, water-reducing rate is high, the slump is small,
The advantages that cement compatibility is good.
Summary of the invention
In order to overcome the disadvantages and deficiencies of the prior art, the primary purpose of the present invention is that providing a kind of four arm starblocks
The preparation method of polycarboxylic acid super-plasticizer, this method do not use unsaturated acids.
Another object of the present invention is to provide four arms starblock polycarboxylic acid super-plasticizers prepared by the above method.
A further object of the present invention is to provide the applications of above-mentioned four arms starblock polycarboxylic acid super-plasticizer.
The purpose of the invention is achieved by the following technical solution:
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) tetratomic pentaerythrite, halogen carboxylic acid derivates are mixed with catalyst, normal-temperature reaction 1h~48h is obtained
Four arm initiator small molecules of halogen sealing end；
(2) after being sufficiently mixed the product of step (1) and monomer A, catalyst, ligand, solvent A, it is passed through N2By O in solution2
Discharge, in N2Protection is lower to carry out atom transfer controlled radical polymerization, and reaction temperature is 20 DEG C~80 DEG C, the reaction time
For 1h~for 24 hours, homopolymer macromolecular solution is obtained, solvent B precipitating is added, obtains macromole evocating agent；
(3) after being sufficiently mixed macromole evocating agent and monomer B, catalyst, ligand, solvent C that step (2) obtains, lead to
Enter N2By O in solution2Discharge, in N2Protection is lower to carry out atom transfer controlled radical polymerization, and reaction temperature is 20 DEG C~80
DEG C, the reaction time is 1h~for 24 hours, and solvent D precipitating is added, obtains four arm block polymer of star；
(4) the four arm block polymer of star that step (3) obtains is mixed with component 1, catalyst, solvent E, 0 DEG C~
120 DEG C of insulated and stirreds reaction 1~for 24 hours, reaction was completed is cooled to room temperature, and adjusts the pH value of solution to neutrality with dilute alkaline soln,
Obtain four arm block super plasticizer of star；
Halogen carboxylic acid derivates described in step (1) are 2- bromo isobutyl acylbromide, 2- bromo isobutyryl chloride, 2- chloro isobutyl
Acyl chlorides, 2- chloro-propanoyl chloride, 2- bromo propionyl chloride, 2- chlorine isobutyric acid, 2- isobutyl bromide, 2- isobutyl ethyl bromide or 2- chlorine isobutyl
One or more of acetoacetic ester；The method of the present invention keeps the primosome activity at center big by introducing the halogen-containing end group being conjugated
Amount is promoted, thermal-initiated polymerization accounting relative reduction.
Catalyst described in step (1) be pyridine, triethylamine, 4-dimethylaminopyridine, bipyridyl, tetramethylethylenediamine,
Five methyl diethylentriamine, hexamethyl trien three (N, N- dimethyl aminoethyl) amine, N, N- dimethyl formyl
In amine, DMAC N,N' dimethyl acetamide, dicyclohexylcarbodiimide, sodium polyphosphate, sodium hydroxide, sodium carbonate or sodium bicarbonate
More than one；
Monomer A described in step (2) is ethyl methacrylate, methyl methacrylate, butyl methacrylate, methyl
Tert-butyl acrylate, ethyl acrylate, methyl acrylate, butyl acrylate, tert-butyl acrylate, benzyl methacrylate, third
One or more of olefin(e) acid benzyl ester, metering system triphenyl phosphate methyl esters or triphenylmethyl acrylate；Monomer A and step (1) small molecule
Initiator molar ratio is (100-400): 1.
The present invention prepares poly- carboxyl super plasticizer using indirect method, is polymerize using the monomer not with metal complex, then
By chemically reacting the carboxyl being reduced in conventional polycarboxylic acid super-plasticizer.
Ligand described in step (2) is bipyridyl, tetramethylethylenediamine, five methyl diethylentriamine or hexamethyl Sanya
One or more of tetramine three (N, N- dimethyl aminoethyl) amine；Its dosage is 1.0-1.2 times of catalyst mole.
Solvent A described in step (2) is toluene, dimethylbenzene, methyl phenyl ethers anisole, methanol, ethyl alcohol, propyl alcohol, methylene chloride, N, N- bis-
One or more of methylformamide, DMAC N,N' dimethyl acetamide, acetone, butanone, ether or tetrahydrofuran.What the present invention used
Solvent is all Examples of non-aqueous solvents, caused by this non-aqueous polymerization can be reduced because of the dissolution sex differernce such as monomer, initiator, complexing agent
Defect excessive to polymerization process number of free radical or too small.
Solvent B described in step (2) is methanol, ethyl alcohol, propyl alcohol, acetone, water, tetrahydrofuran, butanone, ethylene glycol, second two
One or more of alcohol monomethyl ether, N,N-dimethylformamide or DMAC N,N' dimethyl acetamide.
Monomer B described in step (3) is allyl polyethenoxy ether, methyl allyl polyoxyethylene ether, 3- methyl -3- fourth
Alkene -1- polyethylene glycol, 2- methacrylic polyethylene glycol, methoxy polyethylene glycol acrylate, methoxy poly (ethylene glycol) methyl
One or more of acrylate, polyethylene glycol acrylate or polyethylene glycol methacrylate-styrene polymer；The molecular weight of monomer B is
600~1900g/mol, and macromole evocating agent molar ratio (50-200): 1.
Solvent C described in step (3) is toluene, dimethylbenzene, methyl phenyl ethers anisole, methanol, ethyl alcohol, propyl alcohol, methylene chloride, N, N- bis-
One or more of methylformamide, DMAC N,N' dimethyl acetamide, acetone, butanone, ether or tetrahydrofuran.
Catalyst described in step (2) and (3) is copper halide, and dosage is all the 1/100~1/ of monomer A mole
30；The method of the present invention uses the polymerization system of copper halide catalysis, in addition suitably separating-purifying after polymerization, breaks through general radical
The limitation that polymerization can not regulate and control polymer architecture.
The copper halide is one of cuprous bromide, copper bromide, copper chloride or stannous chloride.
Solvent D described in step (3) is methanol, ethyl alcohol, propyl alcohol, acetone, water, tetrahydrofuran, butanone, ethylene glycol, second two
One or more of alcohol monomethyl ether, N,N-dimethylformamide or DMAC N,N' dimethyl acetamide.
Ligand described in step (3) is bipyridyl, tetramethylethylenediamine, five methyl diethylentriamine or hexamethyl Sanya
One or more of tetramine three (N, N- dimethyl aminoethyl) amine, dosage are 1~1.2 times of catalyst mole.
Component 1 described in step (4) be oxalic acid, acetic acid, propionic acid, ethanedioic acid, p-methyl benzenesulfonic acid, trifluoroacetic acid, sulfuric acid,
One or more of nitric acid, hydrochloric acid or hydrobromic acid；Its dosage is 1~10 times of step (3) product molar amount.
Catalyst described in step (4) is cuprous bromide, stannous chloride, copper chloride, copper bromide, zinc chloride, sodium chloride, chlorine
Change one or more of ferrous iron, iron chloride, aluminium chloride, boron trifluoride ether, boron chloride or cobalt chloride；Its dosage is (3) production
The 1/30~1/10 of object mole.
In step (4), solvent E, which can add, to be not added；The solvent E be toluene, dimethylbenzene, methyl phenyl ethers anisole, methanol, ethyl alcohol,
In propyl alcohol, water, methylene chloride, N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, acetone, butanone, ether or tetrahydrofuran
It is one or two kinds of.
Four arms starblock polycarboxylic acid super-plasticizer prepared by the present invention is white solid, and soluble in water is colourless liquid
Body.
Four arm starblock polycarboxylic acid super-plasticizers of the invention can be used as cement water reducing agent.
The principle of the present invention is:
The present invention proposes a kind of four arm starblock polycarboxylic acid super-plasticizers, and the super plasticizer is first with tetrahydroxy molecule
It is blocked with containing halogenated carboxylic acid derivates, then using four arm molecules of halogen sealing end as structural core, with unconventional insatiable hunger
A kind of four arm block super plasticizer of star is finally synthesized by acidolysis and separating-purifying with carboxylic acid derivates for the polymer of arm；
Wherein arm is centered on small molecule, and using carboxyl as core, polyethers is shell, to spatial extent, makes entire star polymer with core for inside
Shell structure is adsorbed on cement particle surface, by the hydrophilic polyethers of shell by biggish steric hindrance, makes cement surface
Between adhesive force decline, even particulate dispersion, at the same will again reunite generate a large amount of Free waters release, mentioned to reach
The purpose of the fluidity of high cement slurry body.The characteristics of super plasticizer has volume low, flowing degree of net paste of cement height etc..
The present invention has the following advantages and effects with respect to the prior art:
(1) controllability of structure can be improved without using traditional unsaturated carboxylic acid polymerization in the present invention, reduces unsaturated in production
The irritation of carboxylic acid.
(2) water-reducing agent synthesized by the present invention has excellent molecular structure controllability.
(3) reaction temperature of the invention can carry out at normal temperature, have the consumption energy low, and regional adaptability waits by force excellent
Point.
(4) present invention has low-dosage, polymolecularity, high fluidity.
(5) product of the present invention is solid, has convenient transportation, storage, water absorption rate and the low feature of corrosivity.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, and embodiments of the present invention are not limited thereto.
Embodiment 1
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) by 13.6g pentaerythrite, 0.1g 4-dimethylaminopyridine, 2- bromine isobutyl acylbromide stirring at normal temperature 24 in flask
Hour.
(2) 35ml acetone being added in product 0.7g in step (1), stirring and dissolving adds benzyl methacrylate 40g,
Cuprous bromide 0.144g, five methyl diethylentriamine 0.144g, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 3h, first
Alcohol: water=1:1 precipitating obtains macromole evocating agent.
(3) by step (2) macromole evocating agent 0.1g, methacrylic acid macrogol ester 10g, cuprous bromide 0.144g,
Tetramethylethylenediamine 0.144g, 20ml acetone, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 12h, methanol: N, N- diformazan
Base formamide=1:1 precipitating.
(4) 10g hydrobromic acid is added in step (3) product 0.1g, 0.1g alchlor, stirring at normal temperature is for 24 hours.Up to four arm stars
Shape block polycarboxylic acid super-plasticizer is labeled as PCE1.
Embodiment 2
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) by 13.6g pentaerythrite, 0.07g triethylamine, 2- bromine isobutyl acylbromide in flask stirring at normal temperature 24 hours.
(2) 30ml tetrahydrofuran is added in product 0.7g in step (1), stirring and dissolving adds benzyl methacrylate
56g, cuprous bromide 0.144g, five methyl diethylentriamine 0.144g, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction
3h, acetone: water=3:1 precipitating obtains macromole evocating agent.
(3) by step (2) macromole evocating agent 0.1g, polyalkylene glycol acrylate ester 10g, cuprous bromide 0.144g, join pyrrole
Pyridine 0.144g, 20ml acetone, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 12h are precipitated in ethyl alcohol.
(4) 20ml tetrahydrofuran, 0.4g p-methyl benzenesulfonic acid, 0.1g iron chloride, room temperature is added in step (3) product 0.1g
Stirring is for 24 hours.Up to four arm block polycarboxylic acid super-plasticizer of star, it is labeled as PCE2.
Embodiment 3
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) 13.6g pentaerythrite, 0.1g five methyl diethylentriamine, 2- bromine isobutyl acylbromide room temperature in flask are stirred
It mixes 13 hours.
(2) 36ml butanone being added in product 0.7g in step (1), stirring and dissolving adds benzyl methacrylate 20g,
Tert-butyl Methacrylate 10g, cuprous bromide 0.144g, five methyl diethylentriamine 0.144g, drum nitrogen, freezing-pumping-
Drum nitrogen, normal-temperature reaction 6h, methanol: water=5:1 precipitating obtains macromole evocating agent.
(3) by step (2) macromole evocating agent 0.1g, methacrylic acid macrogol ester 10g, cuprous bromide 0.144g,
Five methyl diethylentriamine 0.144g, 20ml ethyl alcohol, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 12h, ethyl alcohol: water
=1:2 precipitating.
(4) 25ml methanol is added in step (3) product 0.1g, 3ml formic acid, 40 DEG C of stirrings are for 24 hours.Up to four arm starblocks
Polycarboxylic acid super-plasticizer is labeled as PCE3.
Experimental example 4
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) by 13.6g pentaerythrite, 0.1g pyridine, 2- bromine isobutyl acylbromide in flask stirring at normal temperature 48 hours.
(2) 36ml acetone is added in product 0.7g in step (1), stirring and dissolving adds Tert-butyl Methacrylate
40g, cuprous bromide 0.144g, bipyridyl 0.144g, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 6h, methanol: water=
1:1 precipitating, obtains macromole evocating agent.
(3) by step (2) macromole evocating agent 0.1g, methacrylic acid macrogol ester 10g, cuprous bromide 0.144g,
Five methyl diethylentriamine 0.144g, 20ml methanol, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 12h, methanol: water
=1:3 precipitating.
(4) 25ml ethyl alcohol is added in step (3) product 0.1g, 6ml hydrochloric acid, stirring at normal temperature is for 24 hours.Up to four arm block of star
Polycarboxylic acid super-plasticizer is labeled as PCE4.
Experimental example 5
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) by 13.6g pentaerythrite, 0.1g 4-dimethylaminopyridine, 2- bromine isobutyl acylbromide stirring at normal temperature 48 in flask
Hour.
(2) 36ml ethyl alcohol is added in product 0.7g in step (1), stirring and dissolving adds Tert-butyl Methacrylate
40g, copper chloride 0.09g, bipyridyl 0.144g, drum nitrogen, freezing-pumping-drum nitrogen, 45 DEG C of reaction 6h, methanol: water=1:1
Precipitating, obtains macromole evocating agent.
(3) by step (2) macromole evocating agent 0.1g, polyalkylene glycol acrylate ester 10g, stannous chloride 0.09g, pentamethyl
Diethylenetriamines 0.144g, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 12h, ethyl alcohol: water=1:3 precipitating.
(4) 25ml ethyl alcohol, 6ml nitric acid, cobalt chloride 0.2g, stirring at normal temperature 15h is added in step (3) product 0.1g.To obtain the final product
Four arm block polycarboxylic acid super-plasticizer of star is labeled as PCE5.
Experimental example 6
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) by 13.6g pentaerythrite, 0.1g4- dimethylamino naphthyridine, 2- bromine isobutyl acylbromide stirring at normal temperature 48 in flask
Hour.
(2) 36ml acetone, Tert-butyl Methacrylate 40g, cuprous bromide is added in product 0.7g in step (1)
0.144g, five methyl diethylentriamine 0.144g, drum nitrogen, freezing-pumping-drum nitrogen, 60 DEG C of reaction 6h, methanol: water=
1:1 precipitating, obtains macromole evocating agent.
(3) by step (2) macromole evocating agent 0.1g, methacrylic acid macrogol ester 10g, cuprous bromide 0.144g,
Five methyl diethylentriamine 0.144g, 20ml ethyl alcohol, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 12h, acetone: water
=1:3 precipitating.
(4) trifluoroacetic acid 20ml is added in step (3) product 0.1g, zinc chloride 2g, stirring at normal temperature is for 24 hours.Up to star four
Arm block polycarboxylic acid super-plasticizer is labeled as PCE6.
Experimental example 7
A kind of preparation method of four arms starblock polycarboxylic acid super-plasticizer, comprising the following steps:
(1) by 13.6g pentaerythrite, 0.1g triethylamine, 2- bromine isobutyl acylbromide in flask 0 DEG C stir 48 hours.
(2) 36ml tetrahydrofuran is added in product 0.7g in step (1), stirring and dissolving adds metering system triphenyl phosphate
Methyl esters 30g, copper bromide 0.144g, tetramethylethylenediamine 0.144g, drum nitrogen, freezing-pumping-drum nitrogen, 60 DEG C of reaction 6h, first
Alcohol: water=1:1 precipitating obtains macromole evocating agent.
(3) by macromole evocating agent 0.1g, methacrylic acid macrogol ester 10g, cuprous bromide 0.144g, pentamethyl two
Ethylenetriamine 0.144g, 20ml tetrahydrofuran, drum nitrogen, freezing-pumping-drum nitrogen, normal-temperature reaction 12h, ethyl alcohol: water=1:
3 precipitatings.
(4) ethyl alcohol 20ml, sulfuric acid 0.3g, boron trifluoride ether 0.2g, stirring at normal temperature is added in step (3) product 0.1g
24h.Up to four arm block polycarboxylic acid super-plasticizer of star, it is labeled as PCE7.
Comparative example 1
A kind of preparation method of the random polycarboxylic acid super-plasticizer of four arms star, comprising the following steps:
(1) by 13.6g pentaerythrite, 0.1g triethylamine, 2- bromine isobutyl acylbromide in flask 0 DEG C stir 48 hours.
(2) 36ml tetrahydrofuran is added in product 0.7g in step (1), stirring and dissolving adds the tertiary fourth of methacrylic acid
Ester 30g, methacrylic acid macrogol ester 10g, cuprous bromide 0.144g, bipyridyl 0.144g, drum nitrogen, freezing-pumping-drum
Nitrogen, 60 DEG C of reaction 6h, methanol: water=1:1 precipitating.
(3) methanol 20ml, hydrobromic acid 0.3g, boron trifluoride ether 0.2g, stirring at normal temperature is added in step (2) product 0.1g
24h.Up to the random polycarboxylic acid super-plasticizer of four arm of star, it is labeled as PCE0.
Implementation result
1, paste flowing degree
Using reference cement, according to GB/T8077-2000 " Methods for testing uniformity of concrete admixture " test cement
Paste flowing degree, the ratio of mud 0.35, the volume (rolling over solid volume 0.2%) of super plasticizer is on the basis of the quality of cement.It chooses
The random super plasticizer PCE0 test of four arms, as a result such as the following table 1.
Table 1
2, retentivity is flowed
Using reference cement, according to GB/T8077-2000 " Methods for testing uniformity of concrete admixture " test cement
Paste flowing degree, the ratio of mud 0.35, super plasticizer volume is variable, by 0min, 30min, 60min, 90min, 120min
Fluidity, test result is as follows table 2.
Table 2
Above data shows that four arm block super plasticizers have good fluidity effect, and fluidity is relative to random total
Poly- super plasticizer greatly improves；There is preferable fluidity to keep effect.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of preparation method of four arm starblock polycarboxylic acid super-plasticizers, it is characterised in that the following steps are included:
(1) tetratomic pentaerythrite, halogen carboxylic acid derivates are mixed with catalyst, normal-temperature reaction 1h~48h is obtained halogen
Four arm initiator small molecules of sealing end；
(2) after being sufficiently mixed the product of step (1) and monomer A, catalyst, ligand, solvent A, it is passed through N2By O in solution2Row
Out, in N2Protection is lower to carry out atom transfer controlled radical polymerization, and reaction temperature is 20 DEG C~80 DEG C, and the reaction time is
1h~for 24 hours, homopolymer macromolecular solution is obtained, solvent B precipitating is added, obtains macromole evocating agent；
(3) after being sufficiently mixed macromole evocating agent and monomer B, catalyst, ligand, solvent C that step (2) obtains, it is passed through N2It will
O in solution2Discharge, in N2Protection is lower to carry out atom transfer controlled radical polymerization, and reaction temperature is 20 DEG C~80 DEG C, instead
It is 1h~for 24 hours between seasonable, solvent D precipitating is added, obtains four arm block polymer of star；
(4) the four arm block polymer of star that step (3) obtains is mixed with component 1, catalyst, solvent E, at 0 DEG C~120 DEG C
Insulated and stirred reaction 1~for 24 hours, reaction was completed is cooled to room temperature, and is arrived with the pH value that dilute alkaline soln adjusts solution to neutrality
Four arm block super plasticizer of star；
Halogen carboxylic acid derivates described in step (1) are 2- bromo isobutyl acylbromide, 2- bromo isobutyryl chloride, 2- chloro isobutyryl
Chlorine, 2- chloro-propanoyl chloride, 2- bromo propionyl chloride, 2- chlorine isobutyric acid, 2- isobutyl bromide, 2- isobutyl ethyl bromide or 2- chlorine isobutyric acid
One or more of ethyl ester.
2. preparation method according to claim 1, it is characterised in that: monomer A described in step (2) is methacrylic acid second
Ester, methyl methacrylate, butyl methacrylate, Tert-butyl Methacrylate, ethyl acrylate, methyl acrylate, propylene
Acid butyl ester, tert-butyl acrylate, benzyl methacrylate, benzyl acrylate, metering system triphenyl phosphate methyl esters or propylene triphenyl phosphate
One or more of methyl esters.
3. preparation method according to claim 1, it is characterised in that: monomer B described in step (3) is allyl polyoxy second
Alkene ether, methyl allyl polyoxyethylene ether, 3- methyl-3- butene-1-polyethylene glycol, 2- methacrylic polyethylene glycol, methoxy
Base polyethylene glycol acrylate, methoxy polyethylene glycol methacrylate-styrene polymer, polyethylene glycol acrylate or polyethylene glycol methyl
One or more of acrylate.
4. preparation method according to claim 1, it is characterised in that: catalyst described in step (2) and (3) is halogenation
Copper.
5. the preparation method according to claim 4, it is characterised in that: the copper halide is cuprous bromide, copper bromide, chlorine
Change one of copper or stannous chloride.
6. preparation method according to claim 1, it is characterised in that:
Solvent A described in step (2) is toluene, dimethylbenzene, methyl phenyl ethers anisole, methanol, ethyl alcohol, propyl alcohol, methylene chloride, N, N- dimethyl
One or more of formamide, DMAC N,N' dimethyl acetamide, acetone, butanone, ether or tetrahydrofuran；
Solvent B described in step (2) is methanol, ethyl alcohol, propyl alcohol, acetone, water, tetrahydrofuran, butanone, ethylene glycol, ethylene glycol list
One or more of methyl ether, N,N-dimethylformamide or DMAC N,N' dimethyl acetamide.
7. preparation method according to claim 1, it is characterised in that:
Solvent C described in step (3) is toluene, dimethylbenzene, methyl phenyl ethers anisole, methanol, ethyl alcohol, propyl alcohol, methylene chloride, N, N- dimethyl
One or more of formamide, DMAC N,N' dimethyl acetamide, acetone, butanone, ether or tetrahydrofuran；
Solvent D described in step (3) is methanol, ethyl alcohol, propyl alcohol, acetone, water, tetrahydrofuran, butanone, ethylene glycol, ethylene glycol list
One or more of methyl ether, N,N-dimethylformamide or DMAC N,N' dimethyl acetamide.
8. preparation method according to claim 1, it is characterised in that: component 1 described in step (4) is oxalic acid, acetic acid, third
One or more of acid, ethanedioic acid, p-methyl benzenesulfonic acid, trifluoroacetic acid, sulfuric acid, nitric acid, hydrochloric acid or hydrobromic acid.
9. a kind of four arm starblock polycarboxylic acid super-plasticizers, it is characterised in that: be by the described in any item sides of claim 1-8
Method is made.
10. application of the four arms starblock polycarboxylic acid super-plasticizer as claimed in claim 9 as cement water reducing agent.
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| CN201910343094.5A CN110156944B (en) | 2019-04-26 | 2019-04-26 | Four-arm star-shaped block polycarboxylic acid superplasticizer and preparation method and application thereof |
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Cited By (2)
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| CN111808243A (en) * | 2020-07-28 | 2020-10-23 | 陕西科技大学 | Low-grade concrete workability regulator and preparation method thereof |
| CN114702683A (en) * | 2021-12-30 | 2022-07-05 | 江苏超力建材科技有限公司 | Hyperbranched polycarboxylic acid water reducer and preparation method thereof |
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| CN103482897A (en) * | 2013-09-09 | 2014-01-01 | 江苏博特新材料有限公司 | Block poly-carboxylic acid concrete high-efficiency water reducing agent and preparation method thereof |
| CN105669913A (en) * | 2016-03-03 | 2016-06-15 | 江苏中铁奥莱特新材料有限公司 | Preparation method of star polycarboxylate water reducing agent with controllable molecular structure |
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| CN111808243A (en) * | 2020-07-28 | 2020-10-23 | 陕西科技大学 | Low-grade concrete workability regulator and preparation method thereof |
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| CN114702683A (en) * | 2021-12-30 | 2022-07-05 | 江苏超力建材科技有限公司 | Hyperbranched polycarboxylic acid water reducer and preparation method thereof |
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| CN110156944B (en) | 2022-04-05 |
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