CN110003400A - 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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- CN110003400A CN110003400A CN201910265726.0A CN201910265726A CN110003400A CN 110003400 A CN110003400 A CN 110003400A CN 201910265726 A CN201910265726 A CN 201910265726A CN 110003400 A CN110003400 A CN 110003400A
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- reducer
- polycarboxylate water
- silane coupler
- coupler modified
- modified polycarboxylate
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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
- 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
-
- 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
Abstract
The embodiment of the present application shows a kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof, three the silane coupler modified polycarboxylate water-reducer isoamyl alcohol polyoxyethylene ether, acrylic acid, γ-methacryloxypropyl trimethoxy silane monomers are prepared, the addition of silane coupler modified polycarboxylate water-reducer of the invention can improve the initial flow degree of cement-fly ash slurry, and with the increase of flyash Replacement rate, cement-fly ash slurry initial flow degree is increased with it.Silane coupler modified polycarboxylate water-reducer has stronger adsorption capacity to cement-fly ash slurry, silica is rich in flyash, silica surface contains silicone hydroxyl, silane coupler modified polycarboxylate water-reducer is promoted in the absorption on fly ash grain surface, to reduce the isolation of cement slurry, the application performance of cement slurry is improved.
Description
Technical field
The present invention relates to engineering material technical field, in particular to a kind of silane coupler modified polycarboxylate water-reducer and its
Preparation method.
Background technique
Modern concrete is by portland cement, mineral admixture, aggregate (sand, stone), mixing water together with chemical admixture
Five parts are constituted, and wherein chemical admixture is mixed in concrete with few dosage, can improve the performance of concrete significantly,
Enhance intensity, the durability etc. of concrete, and cement consumption can also be saved, the size of construction is reduced, to reach section
About energy consumption, the social benefit of improvement environment.Since coming out from or so nineteen thirty concrete admixture, it is constantly in continuous development
Among, it has become essential key component in modern concrete now.The quality of its properties of product can influence me
The every year of state is with quality, durability and the service life of hundred billion yuan of concrete works quality, or even can feed through to national warp
Ji, the technical economic benefit and social benefit of infrastructure construction.Wherein, water-reducing agent is to mix and stir concrete to be especially high-strength coagulation
A kind of very important chemical external application additive of soil.
White carbon black and flyash are cement and the common mineral additive of concrete field.White carbon black leads in cement.It crosses
Crystal nucleation effect promotes the progress of cement slurry aquation, reduces hardening cement mortar porosity, improves the intensity of concrete.So
And white carbon black specific surface area is larger, easily adsorbs the Free water in cement slurry and reunites, thus reduce cement slurry mobility, it is right
Concrete strength has an adverse effect.Simultaneously with the polycarboxylate water-reducer poor compatibility that is added in cement, influences polycarboxylic acids and subtract
Function and effect of the aqua in cement.Flyash replaces part of cement, improves cement slurry fluidity and setting time.But powder
Contain a large amount of silica and aluminum oxide, silica and aluminum oxide surface smoother, and poly- carboxylic in coal ash
Adsorption capacity of the sour water-reducing agent in flyash is poor, and during replacing cement with flyash, cement slurry is easily isolated, from
And influence the application performance of cement slurry.
Summary of the invention
To overcome the problems in correlation technique, the present invention provides a kind of silane coupler modified polycarboxylate water-reducer,
Water-reducing property is improved from the molecular structure of polycarboxylate water-reducer, it is sensitive to soil fundamentally to solve polycarboxylate water-reducer
Problem.
First aspect of the embodiment of the present invention discloses a kind of silane coupler modified polycarboxylate water-reducer, described silane coupled
Agent modified polycarboxylic acid water-reducing agent is made of following raw materials, comprising: isoamyl alcohol polyoxyethylene ether, acrylic acid, γ-methacryl
Oxygroup propyl trimethoxy silicane, oxidation-reduction initiator, chain-transferring agent, alcoholic solvent, ethylenediamine tetra-acetic acid, dimethyl formyl
Amine and sodium hydroxide.
Optionally, the dosage of shown chain-transferring agent accounts for the 0.95%~1.15% of all raw material weights.
Optionally, the dosage of the chain-transferring agent accounts for the 1% of all raw material weights.
Optionally, the isoamyl alcohol polyoxyethylene ether, the acrylic acid and the γ-methacryloxypropyl
The molar ratio of trimethoxy silane are as follows: 1:2:3.
Optionally, the chain-transferring agent is mercaptopropionic acid.
Optionally, the reduction initiator is sodium sulfite, the oxidizing initiators potassium peroxydisulfate.
Second aspect of the embodiment of the present invention discloses a kind of preparation method of silane coupler modified polycarboxylate water-reducer, institute
State preparation method the following steps are included:
After γ-methacryloxypropyl trimethoxy silane, alcoholic solvent and deionized water are mixed, ethylenediamine tetraacetic is added
Mixed solution pH value adjustment to acidity is obtained γ-methacryloxypropyl trimethoxy silane hydrating solution by acetic acid；
After isoamyl alcohol polyoxyethylene ether is dissolved in dimethylformamide, mixed with oxidation-reduction initiator and deionized water
Afterwards, preset time is reacted, etherification product is obtained；
Oxidation-reduction initiator, acrylic acid, chain-transferring agent and the γ-methyl-prop is added dropwise simultaneously into the etherification product
Alkene acryloxypropylethoxysilane trimethoxy silane hydrating solution obtains preliminary silane coupler modified polycarboxylate water-reducer；
Sodium hydroxide is added into the preliminary silane coupler modified polycarboxylate water-reducer to change the preliminary silane coupling agent
Property polycarboxylate water-reducer pH value adjustment in it is neutral, obtain the silane coupler modified polycarboxylate water-reducer.
Optionally, it is described into the etherification product simultaneously be added dropwise oxidation-reduction initiator, acrylic acid, chain-transferring agent with
And the γ-methacryloxypropyl trimethoxy silane hydrating solution time for adding is 2.5h~3.5h.
Beneficial effects of the present invention effect is: compared with ordinary water-reducing agent, silane coupler modified poly- carboxylic of the invention
The addition of sour water-reducing agent can improve the initial flow degree of cement-fly ash slurry, and with the increase of flyash Replacement rate, water
Mud-flyash slurry initial flow degree increases with it.Silane coupler modified polycarboxylate water-reducer has cement-fly ash slurry
There is stronger adsorption capacity, cement granules is made to show preferable dispersibility, to improve cement-fly ash slurry initial flow
Dynamic degree.It, can due to containing a large amount of silica and aluminum oxide particle, and these particle surface smoothers in flyash
Flow resistance is reduced, is conducive to improve slurry fluidity.Silane functional is introduced in silane coupler modified polycarboxylate water-reducer,
Improve adsorbance of the water-reducing agent in cement slurry.And silica is rich in flyash, silica surface contains silicone hydroxyl,
Silane coupler modified polycarboxylate water-reducer is promoted to a certain extent in the absorption on fly ash grain surface, to reduce cement
The isolation of slurry improves the application performance of cement slurry.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is that the process of silane coupler modified polycarboxylate water-reducer preparation method provided in an embodiment of the present invention is illustrated
Figure.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
The silane coupler modified polycarboxylate water-reducer that first aspect present invention provides is made of following raw materials, comprising: different
Pentenol polyoxyethylene ether, acrylic acid, γ-methacryloxypropyl trimethoxy silane, oxidation-reduction initiator, chain
Transfer agent, alcoholic solvent, ethylenediamine tetra-acetic acid, dimethylformamide and sodium hydroxide.
Isoamyl alcohol polyoxyethylene ether uses high activated catalyst and special synthesis technology, and molecular weight distribution is relatively narrow, poly- second
Glycol content is low, and double bond retention rate is high.Polymerization activity is substantially increased, conversion rate of products is high, the polycarboxylic acids synthesized with it
Water-reducing agent product effective content is high, water-reducing agent high comprehensive performance.It is closed using isoamyl alcohol polyoxyethylene ether as one of monomer
At polycarboxylate water-reducer there is efficient particle dispersion and holding capacity, have that water-reducing rate is high, cement usage amount is low, enhancing
Effect is good, durability is good, not Corrosion Reinforcement and it is environmentally friendly the advantages that.
Acrylic acid is important organic synthesis raw material and synthetic resin monomer, is the very fast vinyl list of polymerization speed
Body.It is simplest unsaturated carboxylic acid, is made of a vinyl and a carboxyl.Pure acrylic acid is colorless clear liquid,
Penetrating odor with feature.It can dissolve each other with water, alcohol, ether and chloroform, be prepared by the propylene obtained from oil plant.Propylene
Acid is important organic synthesis raw material and synthetic resin monomer, is the very fast vinyl monomer of polymerization speed.It is most of to
Manufacture the esters of acrylic acid such as methyl acrylate, ethyl ester, butyl ester, hydroxyl ethyl ester.Acrylic acid and acrylate can with homopolymerization and copolymerization,
It can be copolymerized with monomers such as acrylonitrile, styrene, butadiene, vinyl chloride and cis-butenedioic anhydrides.Its polymer is used for synthetic resin, gluing
Agent, synthetic rubber, synthetic fibers, super absorbent resin, pharmacy, leather, weaving, chemical fibre, building materials, water process, oil exploitation, painting
The industrial departments such as material.Acrylic acid is one of important source material of water-soluble polymer, and superpower property can be made with starch graft copolymer and inhale
Aqua.One of the monomer of silane coupler modified polycarboxylate water-reducer of the invention using acrylic acid as synthesis.
Hydrolytic condensation occurs in cement slurry for γ-methacryloxypropyl trimethoxy silane, to generate certain
The Free water of amount increases cement slurry setting time, improves the workability of mortar.It is silane coupler modified poly- in cement slurry
With hydrolysis product of cement chemisorption can occur for carboxylic acid water reducer, increase adsorbance of the water-reducing agent in cement slurry, to cement
Rheological characteristic, hydration process and the hardened mortar intensity of slurry generate a series of influences.Based on silica in flyash and white
Silicone hydroxyl is contained on carbon black (silica) surface, and γ-methacryloxypropyl trimethoxy silane is to polycarboxylate water-reducer
Modification by copolymerization is carried out, introduces functionalized silicon group, in polycarboxylate water-reducer main chain to reduce flyash and white carbon black in cement slurry
Using the adverse effect of generation.
Mercaptopropionic acid is the intermediate of medical fenarol, also serves as the stabilizer of polyvinyl chloride.It and thioglycolic acid one
Sample can be used for transparent article, and thermal stability is very good, be better than other stabilizers.Also serve as antioxidant, catalyst and biochemical reagents.
Sodium sulfite reproducibility is extremely strong, and can restore copper ion is that (inferior sulfate radical can be raw with cuprous ion for cuprous ion
Stablize at complex), the weak oxidants such as phosphotungstic acid can also be restored.Sodium sulfite and its hydrogen salt can be used for clearly in laboratory
Except (a small amount of water is added, low-grade fever is stirred to react rear liquid separation, and ether layer is dry with quick lime, is used in the peroxide of ether material
Reaction of less demanding).Potassium peroxydisulfate has strong oxidizing property, being capable of rapidly initiated oxidation reaction.
Compared with ordinary water-reducing agent, the addition of silane coupler modified polycarboxylate water-reducer of the invention can improve cement-
The initial flow degree of flyash slurry, and with the increase of flyash Replacement rate, cement-fly ash slurry initial flow degree is therewith
Increase.Silane coupler modified polycarboxylate water-reducer has stronger adsorption capacity to cement-fly ash slurry, makes cement granules
Preferable dispersibility is shown, to improve cement-fly ash slurry initial flow degree.Due to containing a large amount of two in flyash
Silica and aluminum oxide particle, and these particle surface smoothers, can reduce flow resistance, be conducive to improve slurry
Fluidity.Silane functional is introduced in silane coupler modified polycarboxylate water-reducer, improves suction of the water-reducing agent in cement slurry
Attached amount.And silica is rich in flyash, silica surface contains silicone hydroxyl, promotes silane coupling agent to a certain extent
Absorption of the modified polycarboxylic acid water-reducing agent on fly ash grain surface improves the application of cement slurry to reduce the isolation of cement slurry
Performance.
As preferred embodiment, the dosage of shown chain-transferring agent accounts for the 0.95%~1.15% of all raw material weights.Diminishing
The dispersion performance of agent molecule amount influence Water-reducing Admixtures To Cements particle.In polymerization process, diminishing is adjusted using chain-transferring agent
The size of agent molecule amount.The increase of reaction process Chain transfer agent additive amount, silane coupler modified polycarboxylate water-reducer
Inherent viscosity is gradually reduced, and cement slurry fluidity is in first to increase the trend reduced afterwards.Chain-transferring agent dosage be 0.95%~
In 1.15% range, cement slurry fluidity is greater than 250mm, meets practical application needs.When chain-transferring agent dosage lower than 0.95% or
Greater than 1.15%, silane coupler modified polycarboxylate water-reducer inherent viscosity is too high or too low, cement slurry fluidity less than 250mm,
It has been unsatisfactory for practical application request.Wherein, the optimal additive amount of chain-transferring agent is 1%.
The silane coupler modified polycarboxylate water-reducer preparation method embodiment one that first aspect present invention provides:
It is that the process of silane coupler modified polycarboxylate water-reducer preparation method provided in an embodiment of the present invention is illustrated referring to Fig. 1
Figure, the preparation method comprises the following steps:
Step S101 adds after mixing γ-methacryloxypropyl trimethoxy silane, alcoholic solvent and deionized water
Enter ethylenediamine tetra-acetic acid for mixed solution pH value adjustment to acidity, obtains γ-methacryloxypropyl trimethoxy silane
Hydrating solution.Step S101 is γ-methacryloxypropyl trimethoxy silane hydrolytic process.
Step S102, after isoamyl alcohol polyoxyethylene ether is dissolved in dimethylformamide, with oxidation-reduction initiator and
After deionized water mixing, preset time is reacted, etherification product is obtained.Step S102 is the etherificate of isoamyl alcohol polyoxyethylene ether
Journey.
In step S103, Xiang Suoshu etherification product simultaneously be added dropwise oxidation-reduction initiator, acrylic acid, chain-transferring agent and
The γ-methacryloxypropyl trimethoxy silane hydrating solution obtains preliminary silane coupler modified polycarboxylic acids and subtracts
Aqua.Step S103 is copolymerization process.
Step S104, sodium hydroxide is added into the preliminary silane coupler modified polycarboxylate water-reducer will be described preliminary
It is neutral in silane coupler modified polycarboxylate water-reducer pH value adjustment, obtain the silane coupler modified polycarboxylate water-reducer.
It was proved that shadow of the silane coupler modified polycarboxylate water-reducer to cement-fly ash slurry setting time
The behavior of sound, as flyash Replacement rate increases, cement-fly ash slurry setting time is gradually increased, compared with ordinary water-reducing agent,
Silane coupler modified polycarboxylate water-reducer be added in cement-fly ash slurry can extend cement-fly ash slurry condensation when
Between.This is because flyash Replacement rate increases, the mineral (dicalcium silicate, tricalcium silicate etc.) in cement-fly ash slurry are reduced,
It is delayed so as to cause hydration process.And silane coupler modified polycarboxylate water-reducer is in hydrated product and mineral surfaces adsorbance
It is larger, therefore, to delaying aquation to have obvious effects on.Contain the mineral such as a large amount of dicalcium silicates, tricalcium silicate in portland cement,
These mineral surfaces have a large amount of positive charges, are conducive to water-reducing agent and adsorb in mineral surfaces.And fly ash microsphere surface relatively light
Sliding, water-reducing agent adsorption site is few, and water-reducing agent is weaker to Powder ash adsorption ability.Draw in silane coupler modified polycarboxylate water-reducer
Enter silane functional, improves adsorbance of the water-reducing agent in cement slurry.And silica is rich in flyash, silicon dioxide meter
Silicone hydroxyl is contained in face, promotes silane coupler modified polycarboxylate water-reducer to a certain extent in the suction on fly ash grain surface
It is attached.To show that silane coupler modified polycarboxylate water-reducer of the invention is compared to common polycarboxylate water-reducer and can show
It writes and reduces mud isolation, improve the application performance of cement slurry.
Embodiment two
Step S101 adds after mixing γ-methacryloxypropyl trimethoxy silane, alcoholic solvent and deionized water
Enter ethylenediamine tetra-acetic acid for mixed solution pH value adjustment to acidity, obtains γ-methacryloxypropyl trimethoxy silane
Hydrating solution；
Step S102, after isoamyl alcohol polyoxyethylene ether is dissolved in dimethylformamide, with oxidation-reduction initiator and go from
After sub- water mixing, etherification product is obtained；
Oxidation-reduction initiator, acrylic acid, chain-transferring agent and described is added dropwise in step S103, Xiang Suoshu etherification product simultaneously
γ-methacryloxypropyl trimethoxy silane hydrating solution obtains preliminary silane coupler modified polycarboxylate water-reducer；
Sodium hydroxide is added by the preliminary silane into the preliminary silane coupler modified polycarboxylate water-reducer in step S104
It is neutral in coupling agent modified polycarboxylate water-reducer pH value adjustment, obtain the silane coupler modified polycarboxylate water-reducer.
Wherein, oxidation-reduction initiator, acrylic acid, chain is added dropwise described in step S103 simultaneously into the etherification product
Transfer agent and the γ-methacryloxypropyl trimethoxy silane hydrating solution time for adding be 2.5h~
3.5h.With the increase of polymerization reaction time, the inherent viscosity of silane coupler modified polycarboxylate water-reducer is gradually increased；When anti-
When being 3h between seasonable, the inherent viscosity of KPCE reaches maximum, tends towards stability later；More than 3h, cement slurry flowing between when reacted
Degree reaches 260mm or more；Extend the reaction time, cement slurry fluidity is no longer changed.According to the above experimental result, this reality
The reaction time tested is determined as 2.5h~3.5h.
Implementation result:
Test determines common commercially available polycarboxylate water-reducer and silane coupler modified poly- carboxylic of the invention under the identical volume of addition
The paste flowing degree of the cement of sour water-reducing agent.Test by GB/T8077-2012 " Methods for testing uniformity of concrete admixture " into
Row, W/C=0.29, volume are to roll over solid volume.Select existing common commercially available polycarboxylate water-reducer as a comparison sample.Test result
It is shown in Table 1.
1 pulp flowage results of property of table
As can be seen from the table, silane coupler modified polycarboxylate water-reducer of the invention, in 0.29 ratio of mud and 0.25%
Folding consolidate under volume, be compared to ordinary water-reducing agent in initial paste flowing degree, 1h paste flowing degree and 2h paste flowing degree
Will be more preferable, the ability for showing excellent adsorption capacity, preventing cement slurry from isolating, so that the application performance of cement slurry
It is more excellent.
Those skilled in the art will readily occur to its of the application after considering specification and practicing application disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by above
Claim is pointed out.
It should be understood that the application is not limited to the accurate process for being described above and being shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.
Claims (8)
1. a kind of silane coupler modified polycarboxylate water-reducer, which is characterized in that the silane coupler modified polycarboxylic acids diminishing
Agent is made of following raw materials, comprising: isoamyl alcohol polyoxyethylene ether, acrylic acid, γ-methacryloxypropyl trimethoxy
Silane, oxidation-reduction initiator, chain-transferring agent, alcoholic solvent, ethylenediamine tetra-acetic acid, dimethylformamide and sodium hydroxide.
2. a kind of silane coupler modified polycarboxylate water-reducer according to claim 1, which is characterized in that shown chain tra nsfer
The dosage of agent accounts for the 0.95%~1.15% of all raw material weights.
3. a kind of silane coupler modified polycarboxylate water-reducer according to claim 2, which is characterized in that the chain tra nsfer
The dosage of agent accounts for the 1% of all raw material weights.
4. a kind of silane coupler modified polycarboxylate water-reducer according to claim 1, which is characterized in that the iso-amylene
The molar ratio of alcohol polyoxyethylene ether, the acrylic acid and the γ-methacryloxypropyl trimethoxy silane are as follows:
1:2:3.
5. a kind of silane coupler modified polycarboxylate water-reducer according to claim 1, which is characterized in that the chain tra nsfer
Agent is mercaptopropionic acid.
6. a kind of silane coupler modified polycarboxylate water-reducer according to claim 1, which is characterized in that the reduction is drawn
Hair agent is sodium sulfite, the oxidizing initiators potassium peroxydisulfate.
7. a kind of preparation method of silane coupler modified polycarboxylate water-reducer, which is characterized in that the preparation method include with
Lower step:
After γ-methacryloxypropyl trimethoxy silane, alcoholic solvent and deionized water are mixed, ethylenediamine tetraacetic is added
Mixed solution pH value adjustment to acidity is obtained γ-methacryloxypropyl trimethoxy silane hydrating solution by acetic acid；
After isoamyl alcohol polyoxyethylene ether is dissolved in dimethylformamide, mixed with oxidation-reduction initiator and deionized water
Afterwards, etherification product is obtained；
Oxidation-reduction initiator, acrylic acid, chain-transferring agent and the γ-methyl-prop is added dropwise simultaneously into the etherification product
Alkene acryloxypropylethoxysilane trimethoxy silane hydrating solution obtains preliminary silane coupler modified polycarboxylate water-reducer；
Sodium hydroxide is added into the preliminary silane coupler modified polycarboxylate water-reducer to change the preliminary silane coupling agent
Property polycarboxylate water-reducer pH value adjustment in it is neutral, obtain the silane coupler modified polycarboxylate water-reducer.
8. a kind of preparation method of silane coupler modified polycarboxylate water-reducer according to claim 7, which is characterized in that
It is described that oxidation-reduction initiator, acrylic acid, chain-transferring agent and the γ-methyl-prop is added dropwise simultaneously into the etherification product
The time for adding of alkene acryloxypropylethoxysilane trimethoxy silane hydrating solution is 2.5h~3.5h.
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