CN109912751A - A kind of water-reducing agent and preparation method thereof - Google Patents
A kind of water-reducing agent and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to concrete admixture field, in particular to a kind of water-reducing agent and preparation method thereof.The water-reducing agent is formed by polymerization of unsaturated monomers, and the unsaturated monomer includes: 79~94wt% of polyoxyethylene ether containing unsaturated bond；Unsaturated 1~10wt% of esters；5~20wt% of unsaturated carboxylic acid or derivatives thereof；The polyoxyethylene ether molecular weight containing unsaturated bond is 800~4000.The present invention introduces a kind of biggish unsaturated esters of molecular weight, the water-reducing agent molecular structure generated is made to become dendroid by MOLECULE DESIGN.On the one hand traditional water retention can be played, the tension of concrete surface can be reduced, to not influence the viscosity and mobility of concrete；On the other hand, in strongly basic medium, can the biggish alcohol of hydrolysis molecular weight, reduce concrete surface tension, to Free water have good package action, thus preferably solve concrete water bleeding problem.
Description
Technical field
The present invention relates to concrete admixture field, in particular to a kind of water-reducing agent and preparation method thereof.
Background technique
With the continuous development of architectural engineering technology, concrete quality demand is also continuously increased therewith.Water-reducing agent is a kind of
Under conditions of maintaining concrete slump to be basically unchanged, the concrete admixture of mixing water amount can be reduced.Belong to yin mostly
Ionic surface active agent has lignosulfonates, naphthalene sulphonate formaldehyde polymer etc..It is added after concrete mix to cement
Grain has peptizaiton, can improve its workability, reduces unit consumption of water, improves the mobility of concrete mix, or reduces single
Position cement consumption, saves cement.Wherein, polycarboxylate water-reducer has obtained more extensive as the new material of new green environment protection
Using.
Traditional polycarboxylate water-reducer is more sensitive to volume and the ratio of mud, and cement is very different in addition, cement it is stagnant
Bleeding afterwards brings many problems to the workability of fresh concrete, seriously reveals stone, serious bleeding, plays phenomena such as heap takes off bottom, adopts
It not can guarantee the uniformity of pour mass with this mixture, and easily lead to works surface and pitted skin, dusting, hole etc. occur and be difficult to
The defect of receiving, and structure strength and durability degradation.
In most cases, the problems such as solving bleeding is adding of fiber element, xanthan gum, polyethylene in polycarboxylate water-reducer
Alcohol etc., but these high molecular thickeners exist with polycarboxylate water-reducer poor compatibility, increase concrete viscosity, influence coagulation
The defects of native mobility.
High performance water reducing agent of polyocarboxy acid is by unsaturated polymeric monomer, and unsaturated monomer and other monomers are copolymerized, no
Be saturated monomer diversity and molecular structure graft copolymerization the features such as determine synthesis polycarboxylate water-reducer it is special
Function improves working performance of concrete in the commerical ready-mixed concrete epoch, and the pumpability for improving concrete is especially necessary.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of water-reducing agent and preparation method thereof, the water-reducing agent has guarantor
While outlet capacity, have the function of reducing concrete surface tension, to not influence the viscosity and mobility of concrete, simultaneously
The group for promoting hydration reaction is introduced in structure, guarantees the normal condensation and strength development of concrete.
The invention discloses a kind of water-reducing agents, which is characterized in that is formed by polymerization of unsaturated monomers, the unsaturated monomer
Include:
79~94wt% of polyoxyethylene ether containing unsaturated bond；
Unsaturated 1~10wt% of esters；
5~20wt% of unsaturated carboxylic acid or derivatives thereof；
The polyoxyethylene ether molecular weight containing unsaturated bond is 800~4000.
Preferably, the polyoxyethylene ether containing unsaturated bond is allyl polyethenoxy ether, methacrylic polyoxy second
One or more of alkene ether and isoamyl alcohol polyoxyethylene ether.
Preferably, the insatiable hunger esters are methacrylate.
Preferably, the unsaturated carboxylic acid is acrylic acid, methacrylic acid, styrene sulfonic acid and 2- Methacrylamide-
The one or two of 3- propene sulfonic acid.
The invention discloses a kind of preparation methods of water-reducing agent described in above-mentioned technical proposal, comprising the following steps:
Unsaturated monomer carries out polymerization reaction under the action of initiator, reducing agent and chain-transferring agent, obtains water-reducing agent；
The unsaturated monomer includes:
79~94wt% of polyoxyethylene ether containing unsaturated bond；
Unsaturated 1~10wt% of esters；
5~20wt% of unsaturated carboxylic acid or derivatives thereof；
The polyoxyethylene ether molecular weight containing unsaturated bond is 800~4000.
Preferably, the preparation method specifically:
Polyoxyethylene ether, initiator and water containing unsaturated bond are mixed, mixed liquor is obtained；The additive amount of the initiator
It is the 0.1~2% of the unsaturated monomer gross mass；
Unsaturated carboxylic acid monomer or derivatives thereof and unsaturated esters is soluble in water, obtain combination liquid A；
Reducing agent, chain-transferring agent and water are mixed, combination liquid B is obtained；The additive amount of the reducing agent is unsaturated monomer
3% or less gross mass；The additive amount of the chain-transferring agent is the 0.1~2% of unsaturated monomer gross mass；
Combination liquid A and combination liquid B are added drop-wise in mixed liquor, polymerization reaction is carried out, obtains water-reducing agent.
Preferably, it after the polymerization reaction, adds alkali or aqueous slkali carries out neutralization reaction, the alkali is sodium hydroxide, hydrogen
Potassium oxide or triethanolamine；The temperature when neutralization reaction is 50 DEG C or less.
Preferably, after the neutralization reaction, the water-reducing agent that solid content is 30~70% is obtained.
Preferably, the time that the combination liquid A and combination liquid B are added dropwise is 1~4 hour, and the polymerization time is 1~3 small
When, the temperature of the polymerization reaction is 10~30 DEG C.
Preferably, the initiator is the dioxygen that potassium peroxydisulfate, sodium peroxydisulfate, ammonium persulfate or mass concentration are 30%
Water, the reducing agent are one of iron sulfite, sodium sulfite, sodium hydrogensulfite, ascorbic acid and arabo-ascorbic acid or several
Kind；The chain-transferring agent is one or more of mercaptopropionic acid, thioacetic acid, mercaprol and mercaptoethanol.
Compared with prior art, the present invention introduces a kind of biggish unsaturated esters of molecular weight, makes to give birth to by MOLECULE DESIGN
At water-reducing agent molecular structure become dendroid.On the one hand traditional water retention can be played, concrete surface can be reduced
Tension, to not influence the viscosity and mobility of concrete；It on the other hand, being capable of hydrolysis molecule in strongly basic medium
Biggish alcohol is measured, concrete surface tension is reduced, there is good package action to Free water, to preferably solve concrete water bleeding
Problem.In addition, preparation method of the invention is simple, no three industrial wastes are generated, and environment-friendly type is good；Production cost is low, and economic benefit is prominent
Out.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions are only further explanation the features and advantages of the present invention, rather than to the claims in the present invention
Limitation.
Embodiment of the invention discloses a kind of water-reducing agents, are formed by polymerization of unsaturated monomers, the unsaturated monomer packet
It includes:
79~94wt% of polyoxyethylene ether containing unsaturated bond；
Unsaturated 1~10wt% of esters；
5~20wt% of unsaturated carboxylic acid or derivatives thereof；
The polyoxyethylene ether molecular weight containing unsaturated bond is 800~4000.
In the present invention, by MOLECULE DESIGN, the biggish unsaturated esters of molecular weight is introduced, the diminishing agent molecule generated is made
Structure becomes dendroid.By adjusting the relative scale of main polymer chain Shang Ge functional group, main polymer chain and graft side chain
Length and graft side chain number, rationalize its molecular structure, better adaptability.
In the present invention, the polyoxyethylene ether containing unsaturated bond is preferably allyl polyethenoxy ether, methallyl
One or more of base polyoxyethylene ether and isoamyl alcohol polyoxyethylene ether, the polyoxyethylene ether molecule containing unsaturated bond
Amount is 800~4500, preferably 1500~3000, more preferably 2400.The polyoxyethylene ether molecular weight containing unsaturated bond
Content account for the 79~94wt%, preferably 85~90wt% of unsaturated monomer gross mass.
The unsaturation esters are preferably methacrylate, such as methyl methacrylate, ethyl methacrylate, first
Base propyl acrylate etc..The content of the unsaturation esters accounts for 1~10wt% of unsaturated monomer gross mass, preferably 1.5~
3wt%.
The unsaturated carboxylic acid monomer is acrylic acid, methacrylic acid, styrene sulfonic acid and 2- Methacrylamide -3- third
The one or two of alkene sulfonic acid.The content of the unsaturated carboxylic acid monomer or derivatives thereof account for unsaturated monomer gross mass 5~
20wt%, preferably 7~15wt%.
In the present invention, the unsaturated monomer completes free radical under the action of chain-transferring agent, reducing agent and initiator
Polymerization reaction generates polymer.By adjusting the additive amount of different types of unsaturated monomer, on adjustable main polymer chain
The number of the relative scale of each functional group, the length of main polymer chain and graft side chain and graft side chain, subtracts to ensure that
The performance of aqua.
The embodiment of the invention also discloses the preparation methods of water-reducing agent, comprising the following steps:
Unsaturated monomer carries out polymerization reaction under the action of initiator, reducing agent and chain-transferring agent, obtains water-reducing agent；
The unsaturated monomer includes:
79~94wt% of polyoxyethylene ether containing unsaturated bond；
Unsaturated 1~10wt% of esters；
5~20wt% of unsaturated carboxylic acid or derivatives thereof；
The polyoxyethylene ether molecular weight containing unsaturated bond is 800~4000.
The initiator is preferably the hydrogen peroxide that potassium peroxydisulfate, sodium peroxydisulfate, ammonium persulfate or mass concentration are 30%, institute
Stating reducing agent is preferably one of iron sulfite, sodium sulfite, sodium hydrogensulfite, ascorbic acid and arabo-ascorbic acid or several
Kind；The chain-transferring agent is preferably one or more of mercaptopropionic acid, thioacetic acid, mercaprol and mercaptoethanol.
As preferred embodiment, the preparation method specifically:
Polyoxyethylene ether, initiator and water containing unsaturated bond are mixed, mixed liquor is obtained；The additive amount of the initiator
It is the 0.1~2% of the unsaturated monomer gross mass；
Unsaturated carboxylic acid monomer or derivatives thereof and unsaturated esters is soluble in water, obtain combination liquid A；
Reducing agent, chain-transferring agent and water are mixed, combination liquid B is obtained；The additive amount of reducing agent is the total matter of unsaturated monomer
3% or less amount；The additive amount of the chain-transferring agent is the 0.1~2% of unsaturated monomer gross mass；
Combination liquid A and combination liquid B are added drop-wise in mixed liquor, polymerization reaction is carried out, obtains water-reducing agent.
The combination liquid A and the time for combining liquid B dropwise addition are preferably 1~4 hour, and the polymerization time is preferably 1~3 small
When, the temperature of the polymerization reaction is preferably 10~30 DEG C.
Preferably, it after the polymerization reaction, adds alkali or aqueous slkali carries out neutralization reaction；After the neutralization reaction,
Obtain the water-reducing agent that solid content is 30~70%.The alkali is preferably sodium hydroxide, potassium hydroxide or triethanolamine；The neutralization
Temperature when reaction is preferably 50 DEG C or less.By the neutralization reaction, pH value is adjusted to 3~7.
For a further understanding of the present invention, below with reference to embodiment to water-reducing agent provided by the invention and preparation method thereof into
Row is described in detail, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 244.1g water, 355.8g molecular weight is added
2400 methyl allyl polyoxyethylene ether starts to stir, and is uniformly mixed, and record start temperature is 21 DEG C, adds 2.9g mistake
Ammonium sulfate is uniformly mixed, obtains mixed liquor.
31.6g acrylic acid, 7.9g hydroxyethyl methacrylate are dissolved in 138.3g deionized water, obtain combination liquid A；
The mercaptopropionic acid of 0.5g ascorbic acid, 1.7g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 29 DEG C, continues to stir 1.5h later, temperature is adjusted to 33 DEG C.The sodium hydroxide of 19.7g30wt% is added
The water-retaining type polycarboxylate water-reducer PCEs-1 that solid content is 40% is made in aqueous solution, adjustment system pH to 5 ± 2.
Embodiment 2
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 252.5g water, 355.8g molecular weight is added
2400 methyl allyl polyoxyethylene ether starts to stir, and is uniformly mixed, and record start temperature is 19 DEG C, adds 3.5g mistake
Ammonium sulfate is uniformly mixed, obtains mixed liquor.
34.6g acrylic acid, 7.9g hydroxyethyl methacrylate are dissolved in 138.3g deionized water, obtain combination liquid A；
The mercaptopropionic acid of 1.3g ascorbic acid, 2.3g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 27 DEG C, continues to stir 1.5h later, temperature is adjusted to 31 DEG C.The sodium hydroxide of 19.7g30wt% is added
The water-retaining type polycarboxylate water-reducer PCEs-2 that solid content is 40% is made in aqueous solution, adjustment system pH to 5 ± 2.
Embodiment 3
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 252.3g water, 355.8g molecular weight is added
2400 methyl allyl polyoxyethylene ether starts to stir, and is uniformly mixed, and record start temperature is 18 DEG C, adds 3.5g mistake
Ammonium sulfate is uniformly mixed, obtains mixed liquor.
34.6g acrylic acid, 9.8g hydroxyethyl methacrylate are dissolved in 138.3g deionized water, obtain combination liquid A；
The mercaptopropionic acid of 0.8g ascorbic acid, 1.6g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 27.5 DEG C, continues to stir 1h later, temperature is adjusted to 31 DEG C.The sodium hydroxide of 19.7g30wt% is added
The water-retaining type polycarboxylate water-reducer PCEs-3 that solid content is 40% is made in aqueous solution, adjustment system pH to 5 ± 2.
Embodiment 4
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 250.3g water, 355.8g molecular weight is added
2400 pentenol polyoxyethylene ether, starts to stir, and is uniformly mixed, and record start temperature is 18.5 DEG C, adds 3.5g over cure
Sour ammonium is uniformly mixed, obtains mixed liquor.
34.6g acrylic acid, 7.8g methyl methacrylate are dissolved in 138.3g deionized water, obtain combination liquid A；
The mercaptopropionic acid of 0.8g ascorbic acid, 1.7g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 28 DEG C, continues to stir 2h later, temperature is adjusted to 31.5 DEG C.The sodium hydroxide of 19.7g30wt% is added
The water-retaining type polycarboxylate water-reducer PCEs-4 that solid content is 40% is made in aqueous solution, adjustment system pH to 5 ± 2.
Embodiment 5
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 256.1g water, 355.8g molecular weight is added
2400 methyl allyl polyoxyethylene ether starts to stir, and is uniformly mixed, and record start temperature is 25 DEG C, adds 3.9g mistake
Ammonium sulfate is uniformly mixed, obtains mixed liquor.
34.6g acrylic acid, 7.8g ethyl methacrylate are dissolved in 138.3g deionized water, obtain combination liquid A；
The mercaptopropionic acid of 1.8g sodium sulfite, 2.2g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 30 DEG C, continues to stir 2h later, temperature is adjusted to 37 DEG C.The water of the sodium hydroxide of 19.7g30wt% is added
The water-retaining type polycarboxylate water-reducer PCEs-5 that solid content is 40% is made in solution, adjustment system pH to 5 ± 2.
Embodiment 6
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 256.3g water, 355.8g molecular weight is added
2400 pentenol polyoxyethylene ether, starts to stir, and is uniformly mixed, and record start temperature is 16 DEG C, adds 3.5g persulfuric acid
Ammonium is uniformly mixed, obtains mixed liquor.
35.5g acrylic acid, 9.9g methyl methacrylate are dissolved in 138.3g deionized water, obtain combination liquid A；
The mercaptopropionic acid of 0.8g ascorbic acid, 2.3g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 24 DEG C, continues to stir 2h later, temperature is adjusted to 28 DEG C.The water of the sodium hydroxide of 19.7g30wt% is added
The water-retaining type polycarboxylate water-reducer PCEs-6 that solid content is 40% is made in solution, adjustment system pH to 5 ± 2.
Comparative example 1
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 244.1g water, 355.8g molecular weight is added
2400 methyl allyl polyoxyethylene ether starts to stir, and is uniformly mixed, and record start temperature is 21 DEG C, adds 2.9g mistake
Ammonium sulfate is uniformly mixed, obtains mixed liquor.
31.6g acrylic acid is dissolved in 138.3g deionized water, obtains combination liquid A；
The mercaptopropionic acid of 0.5g ascorbic acid, 1.7g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 29 DEG C, continues to stir 1.5h later, temperature is adjusted to 33 DEG C.The sodium hydroxide of 19.7g30wt% is added
The water-reducing agent PCEb-1 that solid content is 40% is made in aqueous solution, adjustment system pH to 5 ± 2.
Comparative example 2
It is added dropwise in the four-hole boiling flask of pump equipped with thermometer, blender, constant current, 244.1g water, 355.8g molecular weight is added
2400 methyl allyl polyoxyethylene ether starts to stir, and is uniformly mixed, and record start temperature is 21 DEG C, adds 2.9g mistake
Ammonium sulfate is uniformly mixed, obtains mixed liquor.
7.9g hydroxyethyl methacrylate is dissolved in 138.3g deionized water, obtains combination liquid A；
The mercaptopropionic acid of 0.5g ascorbic acid, 1.7g is dissolved in the deionized water of 197.6g, is uniformly mixed, and obtains combination liquid B；
In the mixed liquor, starts that combination liquid A and combination liquid B are added dropwise respectively, drop evenly and finish in 3h.Reaction system
Temperature is maintained at 29 DEG C, continues to stir 1.5h later, temperature is adjusted to 33 DEG C.The sodium hydroxide of 19.7g30wt% is added
The water-reducing agent PCEb-2 that solid content is 40% is made in aqueous solution, adjustment system pH to 5 ± 2.
Referring to GB8076-2008 " concrete admixture ", " the normal concrete mechanical property test side GB/T50081-2002
Method standard " relevant regulations, the slump, the slump-retaining, bleeding rate, gassiness of this product are detected using concrete test
The performance parameters such as amount, compression strength.Concrete mix and application effect related data are as shown in table 1,2.
1 concrete mix (kg/m of table3)
| W | C | FA | S | G |
| 165 | 260 | 100 | 820 | 1080 |
Note: W is tap water；C is Ji east PO42.5；FA is II grades of flyash of Yongji power plant；S is natural river sand, fineness
Modulus is 2.7；G is rubble 5-31.5 continuous grading.
2 concrete application effect related data of table:
Note: 1, it is the 0.12% of cementitious material quality that additive, which rolls over solid volume, experimental enviroment: 22 DEG C of temperature, humidity
55%.
Note: 2, H-8 is Huang Teng Chemical Co., Ltd. standard type polycarboxylate water-reducer.
As above-mentioned data it is found that the water reducing ability of water-retaining type polycarboxylate water-reducer, slump retaining synthesized by the present invention and common
Type polycarboxylate water-reducer is suitable, the normal pressure bleeding rate and pressured bleeding of concrete can be significantly reduced, and concrete is strong
Degree is also increased slightly than normal concrete.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of water-reducing agent, which is characterized in that formed by polymerization of unsaturated monomers, the unsaturated monomer includes:
79~94wt% of polyoxyethylene ether containing unsaturated bond；
Unsaturated 1~10wt% of esters；
5~20wt% of unsaturated carboxylic acid or derivatives thereof；
The polyoxyethylene ether molecular weight containing unsaturated bond is 800~4000.
2. water-reducing agent according to claim 1, which is characterized in that the polyoxyethylene ether containing unsaturated bond is allyl
One or more of polyoxyethylene ether, methyl allyl polyoxyethylene ether and isoamyl alcohol polyoxyethylene ether.
3. water-reducing agent according to claim 1, which is characterized in that the insatiable hunger esters are methacrylate.
4. water-reducing agent according to claim 1, which is characterized in that the unsaturated carboxylic acid be acrylic acid, methacrylic acid,
The one or two of styrene sulfonic acid and 2- Methacrylamide -3- propene sulfonic acid.
5. a kind of preparation method of water-reducing agent described in claim 1, comprising the following steps:
Unsaturated monomer carries out polymerization reaction under the action of initiator, reducing agent and chain-transferring agent, obtains water-reducing agent；
The unsaturated monomer includes:
79~94wt% of polyoxyethylene ether containing unsaturated bond；
Unsaturated 1~10wt% of esters；
5~20wt% of unsaturated carboxylic acid or derivatives thereof；
The polyoxyethylene ether molecular weight containing unsaturated bond is 800~4000.
6. preparation method according to claim 5, which is characterized in that the preparation method specifically:
Polyoxyethylene ether, initiator and water containing unsaturated bond are mixed, mixed liquor is obtained；The additive amount of the initiator is institute
State the 0.1~2% of unsaturated monomer gross mass；
Unsaturated carboxylic acid monomer or derivatives thereof and unsaturated esters is soluble in water, obtain combination liquid A；
Reducing agent, chain-transferring agent and water are mixed, combination liquid B is obtained；The additive amount of the reducing agent is the total matter of unsaturated monomer
3% or less amount；The additive amount of the chain-transferring agent is the 0.1~2% of unsaturated monomer gross mass；
Combination liquid A and combination liquid B are added drop-wise in mixed liquor, polymerization reaction is carried out, obtains water-reducing agent.
7. preparation method according to claim 6, which is characterized in that after the polymerization reaction, add alkali or aqueous slkali into
Row neutralization reaction, the alkali are sodium hydroxide, potassium hydroxide or triethanolamine；The temperature when neutralization reaction be 50 DEG C with
Under.
8. preparation method according to claim 7, which is characterized in that after the neutralization reaction, obtaining solid content is 30
~70% water-reducing agent.
9. preparation method according to claim 6, which is characterized in that it is described combination liquid A and combine liquid B be added dropwise time be
1~4 hour, the polymerization time was 1~3 hour, and the temperature of the polymerization reaction is 10~30 DEG C.
10. preparation method according to claim 5, which is characterized in that the initiator be potassium peroxydisulfate, sodium peroxydisulfate,
The hydrogen peroxide that ammonium persulfate or mass concentration are 30%, the reducing agent are iron sulfite, sodium sulfite, sodium hydrogensulfite, resist
One or more of bad hematic acid and arabo-ascorbic acid；The chain-transferring agent is mercaptopropionic acid, thioacetic acid, mercaprol and mercapto
One or more of base ethyl alcohol.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116554412A (en) * | 2023-05-05 | 2023-08-08 | 贵州天威建材科技有限责任公司 | High-dispersibility viscosity-reduction type polycarboxylate water reducer and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408706A (en) * | 2013-08-19 | 2013-11-27 | 科之杰新材料集团有限公司 | High-performance polycarboxylic acid water reducing agent and preparation method thereof |
| CN104193915A (en) * | 2014-08-21 | 2014-12-10 | 广东瑞安科技实业有限公司 | Slow-release type polycarboxylic acid slump retaining agent and preparation method thereof |
| CN105174783A (en) * | 2015-09-10 | 2015-12-23 | 大连市建筑科学研究设计院股份有限公司 | Slow-release type polycarboxylic water reducing agent, preparation method thereof and application |
| CN105949404A (en) * | 2016-06-04 | 2016-09-21 | 石家庄市长安育才建材有限公司 | Preparation method of slump retaining agent capable of releasing controllable polycarboxylic acid |
-
2017
- 2017-12-13 CN CN201711326207.8A patent/CN109912751A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103408706A (en) * | 2013-08-19 | 2013-11-27 | 科之杰新材料集团有限公司 | High-performance polycarboxylic acid water reducing agent and preparation method thereof |
| CN104193915A (en) * | 2014-08-21 | 2014-12-10 | 广东瑞安科技实业有限公司 | Slow-release type polycarboxylic acid slump retaining agent and preparation method thereof |
| CN105174783A (en) * | 2015-09-10 | 2015-12-23 | 大连市建筑科学研究设计院股份有限公司 | Slow-release type polycarboxylic water reducing agent, preparation method thereof and application |
| CN105949404A (en) * | 2016-06-04 | 2016-09-21 | 石家庄市长安育才建材有限公司 | Preparation method of slump retaining agent capable of releasing controllable polycarboxylic acid |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116554412A (en) * | 2023-05-05 | 2023-08-08 | 贵州天威建材科技有限责任公司 | High-dispersibility viscosity-reduction type polycarboxylate water reducer and preparation method thereof |
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