CN108033708A - A kind of efficient cement water reducing agent - Google Patents
A kind of efficient cement water reducing agent Download PDFInfo
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- CN108033708A CN108033708A CN201711377070.9A CN201711377070A CN108033708A CN 108033708 A CN108033708 A CN 108033708A CN 201711377070 A CN201711377070 A CN 201711377070A CN 108033708 A CN108033708 A CN 108033708A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
- C08F251/02—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof on to cellulose or derivatives thereof
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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
- C04B2103/302—Water reducers
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention provides a kind of efficient cement water reducing agent, is related to building material field, includes the raw material of following parts by weight：40 60 parts of modified polycarboxylic acid water-reducing agent, 30 50 parts of propyl sulfonic acid cellulose, 20 35 parts of condensate of melamine sulfonate and formaldehyde, 10 20 parts of calcium lignosulfonate, 5 15 parts of cocounut oil acyl disodium glutamate, 38 parts of guar gum, 0.3 1.5 parts of sodium nitrite, 10 20 parts of volcanic ash, 10 20 parts of calcium hydroxide powder, 4 10 parts of acetone, 50 80 parts of water, 48 parts of auxiliary agent, with slump retaining is good, cement setting time influence it is smaller, the problems such as can solving diminishing, bleed, slow setting, bleeding well, cost is low, the advantages of will not being polluted to environment.
Description
Technical field
The present invention relates to building material field, and in particular to a kind of efficient cement water reducing agent.
Background technology
Concrete is that high performance concrete represents concrete technology now using one of most architecture engineering material
Developing direction.It in several ways has an important influence on the performance of concrete concrete admixture, can make specific, former
Impossible application is possibly realized, and new labor saving flow is realized in the more cost-effective use concrete batching of energy, help,
Realize low-temperature construction of concrete etc..The fast-developing explanation of high-strength high-performance concrete new technology, high performance additive are
A kind of indispensable critical material of concrete technology.And water-reducing agent is most widely used additive product in concrete works
Kind, its dosage accounts for more than the 80% of the total dosage of additive.The major function of cement water reducing agent is exactly to keep concrete mixing
The water consumption during mix is reduced on the premise of the thing slump, improves the rheological property of concrete mix and improves cement and mix
It is also higher and higher to coagulate the fast-developing requirement to cement water reducing agent of the intensity modern construction engineerings of soil, there is combed molecule
The poly carboxylic acid series water reducer of structure is dividing because having the advantages that volume is low, water-reducing rate is high, slump-loss is low, safe and environment-friendly
The free degree is big in minor structure, and synthetic method is various, and high-performance potentiality are big, therefore as the weight of recent domestic research and development
Point.
The volume of polycarboxylic acids dehydragent is relatively small compared with naphthalene system, sulfamate based water reducer, its water-reduction
Very prominent (up to 25-35%), effectively can reduce or prevent the slump-loss of fresh concrete.This kind of high-performance water reducing agent
Successfully study, but since its cost is higher, failed in engineering extensive use at home at present.But in view of its volume,
Water-reducing rate, protect and mould the comprehensive benefits such as function, preferable high performance concrete water-reducing agent of still can yet be regarded as,
Therefore, proceed from the reality, synthesizing new high efficiency water reducing agent is to improving the research level of China's additive, promoting China
The development of chemistry of concrete cause all has positive effect.
The content of the invention
(1) technical problem solved
In view of the deficiencies of the prior art, the present invention provides a kind of efficient cement water reducing agent, have that slump retaining is good, cement
Setting time influences smaller, the problems such as can solving diminishing, bleed, slow setting, bleeding well, and cost is low, and environment will not be caused
The advantages of pollution.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of efficient cement water reducing agent, includes the raw material of following parts by weight：40-60 parts of modified polycarboxylic acid water-reducing agent, third
30-50 parts of base cellulose sulfonate, 20-35 parts of condensate of melamine sulfonate and formaldehyde, 10-20 parts of calcium lignosulfonate, cocounut oil
5-15 parts of acyl disodium glutamate, 3-8 parts of guar gum, 0.3-1.5 parts of sodium nitrite, 10-20 parts of volcanic ash, calcium hydroxide powder
10-20 parts, 4-10 parts of acetone, 50-80 parts of water, 4-8 parts of auxiliary agent.
Preferably, the efficient cement water reducing agent, includes the raw material of following parts by weight：Modified polycarboxylic acid water-reducing agent 45-
55 parts, 36-44 parts of propyl sulfonic acid cellulose, 25-30 parts of condensate of melamine sulfonate and formaldehyde, calcium lignosulfonate 12-18
Part, 8-12 parts of cocounut oil acyl disodium glutamate, 5-7 parts of guar gum, 0.5-1.2 parts of sodium nitrite, 12-16 parts of volcanic ash, hydroxide
15-17 parts of calcium powder, 6-9 parts of acetone, 55-70 parts of water, 5.5-6.5 parts of auxiliary agent.
Preferably, the preparation method of the modified polycarboxylic acid water-reducing agent comprises the following steps：
(1) 60-80 DEG C is heated to after hydroxyethylmethylcellulose and glacial acetic acid being mixed evenly, insulated and stirred 1-2h
Afterwards, it is warming up to 90-100 DEG C, adds maleic anhydride and sodium acetate, cooled to room temperature after insulation reaction 6h, adds water quenching to go out, then
After adding concentrated sulfuric acid stirring 1.5, reaction solution is slowly poured into frozen water, stirring separates out solid, filters, and filter cake is washed to neutrality
Dries pulverizing afterwards；
(2) after mixing upper step product and methyl allyl polyoxyethylene ether plus water stirs, and after raw material all dissolving, adds
Enter hydrogen peroxide, after stirring at normal temperature 2-3h, acrylic acid aqueous solution is added dropwise, after being stirred for 1h, L-AA aqueous solution is added dropwise, continues
After stirring 1h, add sodium hydroxide solution and neutralize, you can obtain the modified polycarboxylic acid water-reducing agent.
Preferably, the mesh number of the calcium hydroxide powder is 400.
Preferably, vacuum drying is used in the step (1) during drying, drying temperature is 50 DEG C -60 DEG C.
Preferably, the concentration of hydrogen peroxide is 30%-50% in the step (2).
(3) beneficial effect
The present invention provides a kind of efficient cement water reducing agent, have the advantages that：
(1) hydroxyl in water-reducing agent (OH), sulfonic group (- SO3H), ether (- O-), carboxyl (- COO-) etc. by ionic bond,
The interactions such as covalent bond, hydrogen bond and Van der Waals force are tightly adsorbed in highly polar cement particle surface, so that cement
Grain is powered, forms absorption electric double layer, is repelled each other principle according to same sex electric charge, prevent the close to each other of adjacent cement granules, increases
The contact area of cement and water, makes the abundant aquation of cement, and during cement granules are spread, discharges agglomerate institute
The free water of parcel, improves workability, reduces and mixes water.
There is hydrophilic polyether lateral chain in water-reducing agent structure, be stretched in aqueous solution, so that in the cement adsorbed
Grain surface is formed with certain thickness hydrophily solid adsorption layer.When cement granules close to when, adsorption layer start it is overlapping, i.e., in water
Steric hindrance effect is produced between mud particle, overlapping more, steric hindrance repulsion is bigger, the obstruction of cohesion cement granules
Also it is bigger so that the slump of concrete keeps good.
After mixing water-reducing agent, a certain amount of fine gas bubbles are introduced into, they are surrounded by the molecular film of water-reducing agent oriented attachment,
And electrical repulsion is produced between cement granules buffer action is produced to cement granules, prevent cement granules from agglomerating.In the rolling of bubble
Under pearl and the effect of floating support, contribute to the opposite slip between cement granules, particles of aggregates in fresh concrete.Thus there is bleed
Isolate " ball " effect, so as to improve the workability of concrete.
(2) the modified polycarboxylic acid water-reducing agent in raw material can change microstructure and the aquation production of the cement slurry after hardening
Thing forms time and pattern, promotes cement to disperse, and improves concrete mix mobility, can substantially reduce flat water
Amount, using water wisely, promotion is early strong, and cocounut oil acyl disodium glutamate can increase the water-reducing rate of water-reducing agent, improve the plasticizing of water-reducing agent
Property, concrete strength is improved, by modified polycarboxylic acid water-reducing agent, propyl sulfonic acid cellulose and condensate of melamine sulfonate and formaldehyde
Compounding use can reduce the usage amount of the modified polycarboxylic acid water-reducing agent of higher price, reduce cost, and compared to individually making
It is more preferable with modified polycarboxylic acid water-reducing agent, water-reducing property.
(3) cement water reducing agent of the invention effectively improves the mobility of concrete, has dispersiveness very well, can effectively subtract
Few concrete vibrating and the work of compacting, have higher water-reducing rate, water-reducing rate is up to 34.2%；Concrete can be effectively improved
Intensity；Increase early strength development, there is good mortar anti-contracility and excellent creep behaviour, and due to can quickly inhale
It is attached, incorporation time, the construction efficiency of higher are reduced, property is stablized, easily storage, and performance still can be steady in a long-term after mixing,
To the hydration influences very little of mortar, the activity of cementitious material is not reduced and can promote aquation to a certain degree, in wider pH value model
There is good adaptability in enclosing, without free formaldehyde (unlike SNF/SMF) and ammonia, safety and environmental protection.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention,
Technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
All other embodiments obtained under the premise of creative work, belong to the scope of protection of the invention.
Embodiment 1：
A kind of efficient cement water reducing agent, includes the raw material of following parts by weight：45 parts of modified polycarboxylic acid water-reducing agent, propyl group sulphur
36 parts of acid cellulose, 25 parts of condensate of melamine sulfonate and formaldehyde, 12 parts of calcium lignosulfonate, cocounut oil acyl disodium glutamate 8
Part, 5 parts of guar gum, 0.5 part of sodium nitrite, 12 parts of volcanic ash, 400 15 parts of mesh calcium hydroxide powder, 6 parts of acetone, 55 parts of water, help
5.5 parts of agent.
Wherein, the preparation method of modified polycarboxylic acid water-reducing agent comprises the following steps：
(1) it is heated to 70 DEG C after hydroxyethylmethylcellulose and glacial acetic acid being mixed evenly, after insulated and stirred 1.5h,
It is warming up to 95 DEG C, adds maleic anhydride and sodium acetate, cooled to room temperature after insulation reaction 6h, adds water quenching to go out, add dense
After sulfuric acid stirring 1.5, reaction solution is slowly poured into frozen water, stirring separates out solid, filters, and filter cake is washed to vacuum after neutrality
Dry, drying temperature is 55 DEG C, then is crushed；
(2) after mixing upper step product and methyl allyl polyoxyethylene ether plus water stirs, and after raw material all dissolving, adds
Enter concentration for 35% hydrogen peroxide, after stirring at normal temperature 2.5h, acrylic acid aqueous solution is added dropwise, after being stirred for 1h, L- Vitamin Cs are added dropwise
Aqueous acid, continues after stirring 1h, adds sodium hydroxide solution and neutralizes, you can obtains the modified polycarboxylic acid water-reducing agent.
Embodiment 2：
A kind of efficient cement water reducing agent, includes the raw material of following parts by weight：55 parts of modified polycarboxylic acid water-reducing agent, propyl group sulphur
44 parts of acid cellulose, 30 parts of condensate of melamine sulfonate and formaldehyde, 18 parts of calcium lignosulfonate, cocounut oil acyl disodium glutamate 12
Part, 7 parts of guar gum, 1.2 parts of sodium nitrite, 16 parts of volcanic ash, 400 17 parts of mesh calcium hydroxide powder, 9 parts of acetone, 70 parts of water, help
6.5 parts of agent.
Wherein, the preparation method of modified polycarboxylic acid water-reducing agent comprises the following steps：
(1) it is heated to 65 DEG C after hydroxyethylmethylcellulose and glacial acetic acid being mixed evenly, after insulated and stirred 1.2h,
It is warming up to 90 DEG C, adds maleic anhydride and sodium acetate, cooled to room temperature after insulation reaction 6h, adds water quenching to go out, add dense
After sulfuric acid stirring 1.5, reaction solution is slowly poured into frozen water, stirring separates out solid, filters, and filter cake is washed to vacuum after neutrality
Dry, drying temperature is 60 DEG C, then is crushed；
(2) after mixing upper step product and methyl allyl polyoxyethylene ether plus water stirs, and after raw material all dissolving, adds
Enter concentration for 40% hydrogen peroxide, after stirring at normal temperature 2h, acrylic acid aqueous solution is added dropwise, after being stirred for 1h, L-AA is added dropwise
Aqueous solution, continues after stirring 1h, adds sodium hydroxide solution and neutralizes, you can obtains the modified polycarboxylic acid water-reducing agent.
Embodiment 3：
A kind of efficient cement water reducing agent, includes the raw material of following parts by weight：40 parts of modified polycarboxylic acid water-reducing agent, propyl group sulphur
30 parts of acid cellulose, 20 parts of condensate of melamine sulfonate and formaldehyde, 10 parts of calcium lignosulfonate, cocounut oil acyl disodium glutamate 5
Part, 3 parts of guar gum, 0.3 part of sodium nitrite, 10 parts of volcanic ash, 400 10 parts of mesh calcium hydroxide powder, 4 parts of acetone, 50 parts of water, help
4 parts of agent.
Wherein, the preparation method of modified polycarboxylic acid water-reducing agent comprises the following steps：
(1) it is heated to 80 DEG C after hydroxyethylmethylcellulose and glacial acetic acid being mixed evenly, after insulated and stirred 1h, rises
Temperature is to 90 DEG C, addition maleic anhydride and sodium acetate, and cooled to room temperature after insulation reaction 6h, adds water quenching to go out, add dense sulphur
After acid stirring 1.5, reaction solution is slowly poured into frozen water, stirring separates out solid, filters, vacuum is done after filter cake is washed to neutrality
Dry, drying temperature is 50 DEG C DEG C, then is crushed；
(2) after mixing upper step product and methyl allyl polyoxyethylene ether plus water stirs, and after raw material all dissolving, adds
Enter concentration for 50% hydrogen peroxide, after stirring at normal temperature 2.5h, acrylic acid aqueous solution is added dropwise, after being stirred for 1h, L- Vitamin Cs are added dropwise
Aqueous acid, continues after stirring 1h, adds sodium hydroxide solution and neutralizes, you can obtains the modified polycarboxylic acid water-reducing agent.
Embodiment 4：
A kind of efficient cement water reducing agent, includes the raw material of following parts by weight：60 parts of modified polycarboxylic acid water-reducing agent, propyl group sulphur
50 parts of acid cellulose, 35 parts of condensate of melamine sulfonate and formaldehyde, 20 parts of calcium lignosulfonate, cocounut oil acyl disodium glutamate 15
Part, 8 parts of guar gum, 1.5 parts of sodium nitrite, 20 parts of volcanic ash, 400 20 parts of mesh calcium hydroxide powder, 10 parts of acetone, 80 parts of water,
8 parts of auxiliary agent.
Wherein, the preparation method of modified polycarboxylic acid water-reducing agent comprises the following steps：
(1) it is heated to 60 DEG C after hydroxyethylmethylcellulose and glacial acetic acid being mixed evenly, after insulated and stirred 1h, rises
Temperature is to 90 DEG C, addition maleic anhydride and sodium acetate, and cooled to room temperature after insulation reaction 6h, adds water quenching to go out, add dense sulphur
After acid stirring 1.5, reaction solution is slowly poured into frozen water, stirring separates out solid, filters, vacuum is done after filter cake is washed to neutrality
Dry, drying temperature is 50 DEG C DEG C, then is crushed；
(2) after mixing upper step product and methyl allyl polyoxyethylene ether plus water stirs, and after raw material all dissolving, adds
Enter concentration for 30% hydrogen peroxide, after stirring at normal temperature 2h, acrylic acid aqueous solution is added dropwise, after being stirred for 1h, L-AA is added dropwise
Aqueous solution, continues after stirring 1h, adds sodium hydroxide solution and neutralizes, you can obtains the modified polycarboxylic acid water-reducing agent.
Embodiment 5：
A kind of efficient cement water reducing agent, includes the raw material of following parts by weight：55 parts of modified polycarboxylic acid water-reducing agent, propyl group sulphur
35 parts of acid cellulose, 35 parts of condensate of melamine sulfonate and formaldehyde, 10 parts of calcium lignosulfonate, cocounut oil acyl disodium glutamate 14
Part, 5 parts of guar gum, 0.5 part of sodium nitrite, 14 parts of volcanic ash, 16 parts of calcium hydroxide powder, 5 parts of acetone, 75 parts of water, auxiliary agent 7
Part.
Wherein, the preparation method of modified polycarboxylic acid water-reducing agent comprises the following steps：
(1) it is heated to 80 DEG C after hydroxyethylmethylcellulose and glacial acetic acid being mixed evenly, after insulated and stirred 2h, rises
Temperature is to 100 DEG C, addition maleic anhydride and sodium acetate, and cooled to room temperature after insulation reaction 6h, adds water quenching to go out, add dense sulphur
After acid stirring 1.5, reaction solution is slowly poured into frozen water, stirring separates out solid, filters, vacuum is done after filter cake is washed to neutrality
Dry, drying temperature is 60 DEG C, then is crushed；
(2) after mixing upper step product and methyl allyl polyoxyethylene ether plus water stirs, and after raw material all dissolving, adds
Enter concentration for 50% hydrogen peroxide, after stirring at normal temperature 3h, acrylic acid aqueous solution is added dropwise, after being stirred for 1h, L-AA is added dropwise
Aqueous solution, continues after stirring 1h, adds sodium hydroxide solution and neutralizes, you can obtains the modified polycarboxylic acid water-reducing agent.
The results are shown in Table 1 for efficient cement water reducing agent main performance prepared by 1-3 of the embodiment of the present invention：
Table 1：
To sum up, the embodiment of the present invention has the advantages that：
Water-reducing agent water-reducing rate of the present invention is high, and void fraction is low, and bleeding rate is low, and shrinking percentage is small.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed, or further include as this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there are other identical element in process, method, article or equipment including the key element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to foregoing each implementation
Technical solution described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these modification or
Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical solution.
Claims (6)
1. a kind of efficient cement water reducing agent, it is characterised in that include the raw material of following parts by weight：Modified polycarboxylic acid water-reducing agent
40-60 parts, 30-50 parts of propyl sulfonic acid cellulose, 20-35 parts of condensate of melamine sulfonate and formaldehyde, calcium lignosulfonate 10-
20 parts, 5-15 parts of cocounut oil acyl disodium glutamate, 3-8 parts of guar gum, 0.3-1.5 parts of sodium nitrite, 10-20 parts of volcanic ash, hydrogen-oxygen
Change 10-20 parts of calcium powder, 4-10 parts of acetone, 50-80 parts of water, 4-8 parts of auxiliary agent.
2. efficient cement water reducing agent as claimed in claim 1, it is characterised in that include the raw material of following parts by weight：It is modified
45-55 parts of polycarboxylate water-reducer, 36-44 parts of propyl sulfonic acid cellulose, 25-30 parts of condensate of melamine sulfonate and formaldehyde, wood
12-18 parts of quality sulfoacid calcium, 8-12 parts of cocounut oil acyl disodium glutamate, 5-7 parts of guar gum, 0.5-1.2 parts of sodium nitrite, volcanic ash
12-16 parts, 15-17 parts of calcium hydroxide powder, 6-9 parts of acetone, 55-70 parts of water, 5.5-6.5 parts of auxiliary agent.
3. efficient cement water reducing agent as claimed in claim 1 or 2, it is characterised in that the modified polycarboxylic acid water-reducing agent
Preparation method comprises the following steps：
(1) it is heated to 60-80 DEG C after hydroxyethylmethylcellulose and glacial acetic acid being mixed evenly, after insulated and stirred 1-2h,
It is warming up to 90-100 DEG C, adds maleic anhydride and sodium acetate, cooled to room temperature after insulation reaction 6h, adds water quenching to go out, then add
After entering concentrated sulfuric acid stirring 1.5, reaction solution is slowly poured into frozen water, stirring separates out solid, filters, after filter cake is washed to neutrality
Dries pulverizing；
(2) after mixing upper step product and methyl allyl polyoxyethylene ether plus water stirs, and after raw material all dissolving, adds double
Oxygen water, after stirring at normal temperature 2-3h, is added dropwise acrylic acid aqueous solution, after being stirred for 1h, L-AA aqueous solution is added dropwise, continues to stir
After 1h, add sodium hydroxide solution and neutralize, you can obtain the modified polycarboxylic acid water-reducing agent.
4. efficient cement water reducing agent as claimed in claim 1 or 2, it is characterised in that the mesh number of the calcium hydroxide powder
For 400.
5. efficient cement water reducing agent as claimed in claim 3, it is characterised in that using true during drying in the step (1)
Sky is dry, and drying temperature is 50 DEG C -60 DEG C.
6. efficient cement water reducing agent as claimed in claim 3, it is characterised in that the concentration of hydrogen peroxide in the step (2)
For 30%-50%.
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| CN115873435A (en) * | 2022-12-15 | 2023-03-31 | 宏源防水科技集团有限公司 | Polymer cement waterproof coating and preparation process thereof |
| CN115873435B (en) * | 2022-12-15 | 2023-09-01 | 宏源防水科技集团有限公司 | Polymer cement waterproof paint and preparation process thereof |
| CN116425449A (en) * | 2023-03-27 | 2023-07-14 | 青岛智成华建筑材料有限公司 | Mortar additive and application thereof |
| CN116425449B (en) * | 2023-03-27 | 2024-08-30 | 青岛智成华建筑材料有限公司 | Mortar additive and application thereof |
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