CN105754045B - A kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof - Google Patents
A kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof Download PDFInfo
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- CN105754045B CN105754045B CN201610117427.9A CN201610117427A CN105754045B CN 105754045 B CN105754045 B CN 105754045B CN 201610117427 A CN201610117427 A CN 201610117427A CN 105754045 B CN105754045 B CN 105754045B
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- C—CHEMISTRY; METALLURGY
- 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
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C04B24/2605—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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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 silane coupler modified polycarboxylate water-reducer and preparation method thereof.Belong to cement additire field.A certain amount of acrylic acid is added into polyether macromonomer solution, after stirring evenly, adds silane coupling agent containing double bond, agitating solution is in clear state, lasting stirring；Continuing to be kept stirring state, adding oxidant, initiator solution and minor comonomer solution；After having stirred 1 2h of post curing, add liquid caustic soda and neutralize, stablize pH value 6, add without double bond silane coupling agent, up to silane coupler modified polycarboxylate water-reducer finished product.Present invention synthesis in polycarboxylic acids molecular backbone by introducing the functional group containing siloxane structure, a kind of anchoring ability that chemical bonding strong interaction is carried out with gelling material particles is provided for the side chain of comb shape polycarboxylate water-reducer, the increase of the anchoring ability, water-reducing agent adaptability, slump retaining can be promoted to significantly increase, and extend use of the water-reducing agent in mineral micro powder field of dispersions to a certain extent.
Description
Technical field
The present invention relates to a kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof, belongs to cement additire neck
Domain.
Background technology
Setting time, fineness, specific surface area and the distribution of particles of cement can all influence the bleeding performance of concrete.Cement
Setting time directly determines the time of cement granules sedimentation, and setting time is longer, the easier bleeding of concrete；The fineness of cement is got over
Slightly, specific surface area is smaller, C3A contents are too small, and early stage hydrated cementitious amount is fewer, and less hydrated product is not enough to blocking concrete
In pore, cause internal moisture easily to move from bottom to top, concrete water bleeding is more serious.In addition, Aggregate containing mud compared with
When more, the early hydration of cement can be seriously affected, the clay in clay can wrap up cement granules, delay and hinder the aquation of cement
And the condensation of concrete, so as to exacerbate the bleeding of concrete；The distribution of particles of mineral admixture equally also contributes to concrete
Bleeding performance, if the fine particle content of mineral admixture is few, coarse granule content is more or vitreum is more, easily cause concrete
Bleeding.
Usual polycarboxylic acids molecule is in comb shaped structure, is usually made of two essential parts of main chain and side chain, one on its main chain
As containing substantial amounts of ionizable carboxyl, long side chain is typically the Hydrophilicrto polyether long-chain such as polyethylene glycol oxide ether, short-side chain is carboxyl,
The groups such as sulfonic group, amide groups.The scattered of cement granules is by the wetting action of electrostatic repulsion, steric hindrance repulsion and hydrone
Etc. caused by weak interaction, adsorption capacity can be lost with the change polycarboxylic acids molecule of microcosmic condition in hydration process, is subtracted
Water effect reduces.At present, since China's cement and admixture kind are complicated uneven with clinker spread in performance, for low activity
Cement, low C3A cement, low C3S contents cement, low surface area cement, it is necessary to develop a kind of polycarboxylic acids diminishing being adapted therewith
Agent matching uses.
104558434 A of CN disclose a kind of siliceous polycarboxylate water-reducer, it is characterised in that molecular structure is multiple logical
Cross the crosslinked silicone molecules of Si-O-Si keys.The present invention introduces organosilicon structures in common polycarboxylate water-reducer structure and leads to
Cross hydrolysis and prepare the double bond containing organic silicon monomer of macromolecular size, then the organic silicon monomer of preparation is subtracted for polycarboxylic acids
Aqua synthetic system, so that polycarboxylate water-reducer molecule size increases, is allowed to be difficult into the intercalation configuration of soil, and then
Reach anti-mud and slow down the effect of consumption.
104628961 A of CN disclose a kind of acrylic polymer graft copolymerization fatty acid vinyl ester and prepare poly- carboxylic
The method of sour water-reducing agent.Acrylate and fatty acid vinyl ester is used to be grafted again then for main reaction raw materials by first polymerizeing
The method of alcoholysis and hydrolysis prepares a kind of acrylic polymer graft copolymerization fatty acid vinyl ester class polycarboxylate water-reducer, i.e.,
Using acrylate as reaction monomers, it polymerize under initiator and molecular weight regulator effect, then connect with fatty acid vinyl ester
Branch polymerization, obtains using graft copolymer of the acrylic polymer as main chain, polyglycerol fatty acid vinyl acetate for side chain, finally to this
Graft copolymer carries out alcoholysis and hydrolysis.
104031217 A of CN disclose a kind of high performance concrete water-reducing agent for having loose pick resistance.It is a kind of energy
Reduce concrete viscosity and adjust loose the poly- of performance and complete sour series high-performance dehydragent, by being screened to PCE synthesis materials
Adjusted with proportioning, introduce non-traditional PCE synthesis materials：The pre-monomer of modified lignin resin and acrylic acid, can change viscous temperature resistance
Organic phosphonate compound, rheological property conditioning agent etc., which gathers preparing new loose anti-stick type, completes sour high-performance water reducing agent.With up to
To when preparing high strength concrete, reducing viscosity, not taking off bottom, the improvement requirement such as workability and divergence, in practical application
In receive preferable effect.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of silane coupler modified polycarboxylate water-reducer and its preparation
Method.
The present invention contains siloxane structure molecule of functional group by being introduced in polycarboxylic acids molecular backbone, with acrylic acid, no
Saturation polyoxyethylene ether etc. carries out copolyreaction, obtains new polycarboxylic acid water reducer.Silane coupling agent containing double bond is currently
A kind of good chemical bonded refractory mould assembly monomer, the silicic acid quasi-oligomer after hydrolysis can carry out chemical bond with the silicate in cement
Close, play Surface binding energy power more stronger than suction-operated, have the effect of its specific aim to the dispersiveness of low activity cement, and significantly
Lift anchoring ability；In addition, polymerization curing after add without double bond silane coupling agent can be free in each side chain or side chain with
Between main chain, steric hindrance repulsion is improved, improves the dispersion performance and function of slump protection of polycarboxylate high performance water-reducing agent, from
The performance of poly carboxylic acid series water reducer is additionally improved in the angle of compounding.
A kind of preparation method of silane coupler modified polycarboxylate water-reducer, comprises the following steps that, wherein raw material number is pressed
Weight meter：
1) 350 parts of polyether macromonomer is placed in reaction vessel, after 5-15 parts of acrylic acid of addition stir evenly, added
0.5-5 parts of silane coupling agents containing double bond, are stirred to solution without obvious bulk or sheet material；
The polyether macromonomer is methyl allyl polyoxyethylene ether, isoamyl alcohol polyoxyethylene ether, modified prenol
The one or more of polyoxyethylene ether；
2) solution obtained by step 1), is added dropwise 2.5-6 parts of oxidants, 2.5-3.5 parts of initiators and 20- successively under agitation
37 parts of minor comonomers, minor comonomer solution time for adding are 1-4h；
The minor comonomer is acrylic acid, methylpropene sodium sulfonate, 2- acrylamide-2-methyl propane sulfonics, itaconic acid, richness
Horse acid, the one or more of maleic anhydride；
3) after the solution curing 1-2h of step 2), add liquid caustic soda and neutralize, stablize pH value 6, add 1-3 parts and be free of double bond
Silane coupling agent stirs evenly.
In step 1), the silane coupling agent containing double bond is vinyl trimethylsilane, 3- (2,3 the third oxygen of epoxy) propyl group first
Base diethoxy silane, vinyltriethoxysilane, one kind or several of γ-methacryloxypropyl trimethoxy silane
Kind.
In step 2),
Oxidant and initiator add time interval 5-10min, and initiator and minor comonomer add interval 5-10min.
Minor comonomer is dripped prior to initiator, and minor comonomer and initiator drip interval time 10-20min.
The oxidant is hydrogen peroxide, Peracetic acid, ammonium persulfate, the one or more of potassium peroxydisulfate；
The initiator is chain-transferring agent and the mixture of reducing agent；
The chain-transferring agent is mercaptopropionic acid, thioacetic acid, mercaptoethanol, the one or more of mercaprol；
The reducing agent is ascorbic acid, formaldehyde closes sulphoxylic acid, the one or more of sodium dithionite；
The minor comonomer is preferably the composition of acrylic acid and 2- acrylamide-2-methyl propane sulfonics.
In step 3),
The double bond silane coupling agent that is free of is gamma-aminopropyl-triethoxy-silane, N- (β aminoethyls)-γ-aminopropyl first
One or more in base-dimethoxysilane.
The beneficial effects of the invention are as follows：
1. adding new branched system, the silicic acid quasi-oligomer after the silane coupling agent side chain hydrolysis of grafting can be with cement
In silicate be chemically bonded, suction-operated is stronger, improve isolation bleeding, anchoring ability is stronger, increase concrete protect
Plasticity.
2. it can be free between each side chain or side chain and main chain without double bond silane coupling agent, with hydrogen bond action, hydrone
Between association, the interface binding power that is combined with cement base of the adjustment branch chain end group of the polynary action mode such as electrostatic repulsion, change
The dispersion performance and function of slump protection of kind polycarboxylate high performance water-reducing agent.
Embodiment
Below by example, the present invention will be further elaborated, and the description below is not right only for explaining the present invention
Content is defined.
Embodiment 1
A kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof, is passed through by the raw material of following parts by weight
Radical polymerization generates:
Bottom liquid:Methyl allyl polyoxyethylene ether:350, acrylic acid:10, deionized water:220；
Vinyl trimethylsilane:2；
Oxidant：Hydrogen peroxide:2.5；
Solution A:Acrylic acid:30, methylpropene sodium sulfonate:5.5, deionized water:71；
Solution B:Mercaptopropionic acid:2.0, ascorbic acid:0.8, deionized water:110；
Liquid caustic soda:12；
Gamma-aminopropyl-triethoxy-silane：1.
The silane coupler modified polycarboxylate water-reducer and preparation method thereof comprises the following steps:By methacrylic polyoxy
Vinethene 350g, acrylic acid 10g and deionized water 220g input reaction container bottoms, are uniformly mixed, add vinyl front three
Base silane 2g；Hydrogen peroxide is chosen as oxidant, ascorbic acid is reducing agent, mercaptopropionic acid chain-transferring agent；Minor comonomer solution is
The aqueous solution of acrylic acid and methylpropene sodium sulfonate；After adding hydrogen peroxide 2.5g, after being spaced 5min, start that B liquid, interval is added dropwise
After 5min, then start that A liquid is added dropwise, the time for adding control of A liquid, B liquid is 2.5h, 3h, after addition, pays attention to controlling temperature, temperature
The upper limit is 45 degree；After being added dropwise, 1.5h is kept the temperature；After insulation, liquid caustic soda 12g is added, adjustment pH value is 6, adds γ-ammonia
Propyl-triethoxysilicane 1g, last moisturizing 184g, stir evenly up to silane coupler modified polycarboxylate water-reducer.
Embodiment 2
A kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof, is passed through by the raw material of following parts by weight
Radical polymerization generates:
Bottom liquid:Isoamyl alcohol polyoxyethylene ether:350, acrylic acid:7, deionized water:270；
3- (2,3 the third oxygen of epoxy) hydroxypropyl methyl diethoxy silane：5；
Oxidant：Peracetic acid:3.8；
Solution A:Acrylic acid:35,2- acrylamide-2-methyl propane sulfonics:4.2, deionized water:78.4；
Solution B:Thioacetic acid:2.8, sodium formaldehyde sulfoxylate:0.6, deionized water:110；
Liquid caustic soda:10；
N- (β aminoethyls)-γ-aminopropyltriethoxy-dimethoxysilane：2.
The silane coupler modified polycarboxylate water-reducer and preparation method thereof comprises the following steps:By methacrylic polyoxy
Vinethene 345g, acrylic acid 7g and deionized water 270g input reaction container bottoms, are uniformly mixed, add 3- (2,3 epoxies third
Oxygen) hydroxypropyl methyl diethoxy silane 5g；Peracetic acid is chosen as oxidant, sodium formaldehyde sulfoxylate is reducing agent, and thioacetic acid chain turns
Move agent；Minor comonomer solution is acrylic acid and the aqueous solution of 2- acrylamide-2-methyl propane sulfonics；After adding Peracetic acid 3.8g,
Be spaced 5min after, start be added dropwise B liquid, be spaced 5min after, then start be added dropwise A liquid, A liquid, B liquid time for adding control for 2.5h,
3h, after addition, pays attention to controlling temperature, temperature upper limit is 45 degree；After being added dropwise, 1.5h is kept the temperature；After insulation, liquid caustic soda is added
10g, adjustment pH value is 6, adds N- (β aminoethyls)-γ-aminopropyltriethoxy-dimethoxysilane 2g, last moisturizing 126g,
Stir evenly up to silane coupler modified polycarboxylate water-reducer.
Embodiment 3
A kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof, is passed through by the raw material of following parts by weight
Radical polymerization generates:
Bottom liquid:Modified isoamyl alcohol polyoxyethylene ether:350, acrylic acid:14.5 deionized water:180；
Vinyltriethoxysilane：0.8；
Oxidant：Ammonium persulfate:5.5；
Solution A:Acrylic acid:25, itaconic acid:5.75 deionized water:61.5；
Solution B:Mercaptoethanol:1.6, sodium dithionite:0.9, deionized water:110；
Liquid caustic soda:8；
N- (β aminoethyls)-γ-aminopropyltriethoxy-dimethoxysilane：3.
The silane coupler modified polycarboxylate water-reducer and preparation method thereof comprises the following steps:Modified prenol is gathered
Ethylene oxide ether 360g, acrylic acid 14.5g and deionized water 180g input reaction container bottoms, are uniformly mixed, add vinyl
Triethoxysilane 0.8g；Ammonium persulfate is chosen as oxidant, sodium dithionite is reducing agent, and mercaptoethanol is chain tra nsfer
Agent；Minor comonomer solution is acrylic acid and the aqueous solution of itaconic acid；After adding ammonium persulfate 5.5g, after being spaced 5min, start that B is added dropwise
Liquid, after being spaced 5min, then starts that A liquid is added dropwise, the time for adding control of A liquid, B liquid is 2.5h, 3h, after addition, pays attention to control temperature
Degree, temperature upper limit are 45 degree；After being added dropwise, 1.5h is kept the temperature；After insulation, liquid caustic soda 8g is added, adjustment pH value is 6, then is added
Enter N- (β aminoethyls)-γ-aminopropyltriethoxy-dimethoxysilane 3g, last moisturizing 223g, stir evenly up to silane coupled
Agent modified polycarboxylic acid water-reducing agent.
The water of silane coupler modified polycarboxylate water-reducer and common polycarboxylate water-reducer in above-described embodiment is tested respectively
Cement paste mobility and its through when mobility and 0.5h starch free bleeding rate only.Cement used in experiment is new 42.5 Pu Guishui of China
Mud, with reference to GB/8076-2008 tests cement paste initial fluidity, through when mobility, with reference to JTG/T F 50-2011《Highway
Bridges and culverts construction technique normalizing》Measure 0.5h starches free bleeding rate only.
Different Water-reducing Admixtures To Cements starch mobility and bleeding only to be influenced
According to it is above-mentioned initial and through when starch mobility only and compare, the embodiment through silane coupler modified polycarboxylate water-reducer
1st, 2,3 initial fluidity is more larger compared with the initial fluidity of ordinary water-reducing agent, and through when mobility also more common diminishing
Agent loss is smaller, this is probably because the sour ether in embodiment 3 is than caused by minimum.In addition, observation 0.5h starches free bleeding rate only
Data variation, the bleeding rate through silane coupler modified polycarboxylate water-reducer is smaller, and bleeding rate score is minimum in example 2, this
It is probably because the silane coupling agent dosage maximum in embodiment 2 causes.
In conclusion the dispersion performance of embodiment 1,2,3 is not more stronger using silane coupler modified water-reducing agent, and anchor
Gu ability is stronger, promote function of slump protection more preferably, the another bleeding that isolates also is obviously improved relatively, and is increased with silane coupling agent dosage
Greatly, improvement is more preferably.
Claims (7)
1. a kind of preparation method of silane coupler modified polycarboxylate water-reducer, comprises the following steps that, wherein raw material number is by weight
Gauge：
1) 350 parts of polyether macromonomer is placed in reaction vessel, after 5-15 parts of acrylic acid of addition stir evenly, adds 0.5-
5 parts of silane coupling agents containing double bond, are stirred to solution without obvious bulk or sheet material；
The polyether macromonomer is methyl allyl polyoxyethylene ether, isoamyl alcohol polyoxyethylene ether, modified prenol polyoxy
The one or more of vinethene；
2) solution obtained by step 1), is added dropwise 2.5-6 parts of oxidants, 2.5-3.5 parts of chain-transferring agents and reduction successively under agitation
Mixture and 20-37 part minor comonomer of agent, minor comonomer solution time for adding are 1-4h；
The minor comonomer is acrylic acid and the composition of 2- acrylamide-2-methyl propane sulfonics；
3) after the solution curing 1-2h of step 2), add liquid caustic soda and neutralize, stablize pH value 6, add 1-3 parts and be free of double bond silane
Coupling agent stirs evenly.
2. preparation method according to claim 1, it is characterised in that in step 1), the silane coupling agent containing double bond is
Vinyl trimethylsilane, vinyltriethoxysilane, one kind of γ-methacryloxypropyl trimethoxy silane or
It is several.
3. preparation method according to claim 1, it is characterised in that in step 2), oxidant and chain-transferring agent and reduction
The mixture of agent adds time interval 5-10min, and initiator and minor comonomer add interval 5-10min；Minor comonomer is prior to initiator
Drip, minor comonomer and the mixture of chain-transferring agent and reducing agent drip interval time 10-20min.
4. preparation method according to claim 1, it is characterised in that in step 2), the oxidant is hydrogen peroxide, peroxide
Acetic acid, ammonium persulfate, the one or more of potassium peroxydisulfate；
5. preparation method according to claim 1, it is characterised in that in step 2), the chain-transferring agent and reducing agent
Mixture in, the chain-transferring agent for mercaptopropionic acid, thioacetic acid, mercaptoethanol, the one or more of mercaprol, institute
The reducing agent stated is ascorbic acid, formaldehyde closes sulphoxylic acid, the one or more of sodium dithionite.
6. preparation method according to claim 1, it is characterised in that described to be free of double bond silane coupling agent in step 3)
For the one or more in gamma-aminopropyl-triethoxy-silane, N- (β aminoethyls)-γ-aminopropyltriethoxy-dimethoxysilane.
7. silane coupler modified polycarboxylate water-reducer prepared by claim 1 to 6 any one of them method.
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