CN115353319A - Water-retaining agent and preparation method and application thereof - Google Patents

Water-retaining agent and preparation method and application thereof Download PDF

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CN115353319A
CN115353319A CN202210784342.1A CN202210784342A CN115353319A CN 115353319 A CN115353319 A CN 115353319A CN 202210784342 A CN202210784342 A CN 202210784342A CN 115353319 A CN115353319 A CN 115353319A
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water
retaining agent
polyacrylic acid
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weight
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CN115353319B (en
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田明
刘雅卓
王君
谭亮
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Hunan Zhongyan Building Material Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/46Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
    • C04B2103/465Water-sorbing agents, hygroscopic or hydrophilic agents

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a water-retaining agent and a preparation method and application thereof. The water-retaining agent can solve the problems of segregation and bleeding, poor cohesiveness and poor workability of concrete materials.

Description

Water-retaining agent and preparation method and application thereof
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a water-retaining agent, and a preparation method and application thereof.
Background
The polycarboxylic acid high-performance water reducing agent has the advantages of low mixing amount, high water reducing rate, environmental protection and the like, and is widely used as a concrete admixture. However, with the shortage of river sand and the shortage of sandstone resources, the large-scale use of machine-made sandstone in the concrete production process, compared with naphthalene series, aliphatic series and other water reducing agents, the polycarboxylate water reducing agent is sensitive to the mixing amount, temperature and aggregate in the concrete, and is easy to generate segregation and bleeding phenomena, so that the quality of the concrete is difficult to ensure.
In the prior art, a polycarboxylate water reducing agent, an adhesion regulator and a water-retaining agent are compounded for use, but the obtained cement particles have poor dispersibility and poor cohesiveness and cohesive force.
Therefore, the development of a water-retaining agent capable of solving the problems of segregation, bleeding, poor cohesiveness and poor workability of concrete materials is an urgent necessity at present.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the water-retaining agent, and the preparation method and the application thereof, which can effectively reduce the segregation and bleeding of concrete and improve the cohesiveness and workability of the concrete.
The invention also provides a preparation method of the water-retaining agent.
The invention also provides application of the water-retaining agent in concrete.
According to the water-retaining agent of the embodiment of the first aspect of the invention, the preparation raw materials comprise sodium hydroxide, polyacrylic acid-acrylate copolymer, polyacrylic acid, gelatin, hydroxypropyl guar gum and maltodextrin.
The embodiment of the first aspect of the invention has at least the following beneficial effects:
1. the gelatin and the hydroxypropyl guar gum in the invention can lock free water in the concrete, and solve the problems of segregation and bleeding of the concrete.
2. The polyacrylic acid-acrylic ester copolymer and polyacrylic acid in the water-retaining agent provided by the invention are rich in carboxyl, can improve the compatibility with a polycarboxylic acid water reducing agent, have functional groups with adsorbability and surface activity, can increase the cohesiveness and the cohesive force of a cement cementing material, and improve the cohesiveness of concrete. Carboxyl group and ester group (ester group is hydrolyzed to become carboxyl group), and the carboxyl group adsorbs Ca 2+ Ca2+ is positive charge on the surface, and R-COO-is negative charge on the surface, and after the two are complexed with each other, the surface is close to neutral, thereby reducing Ca 2+ And further plays a role in dispersing cement particles.
3. The cement cementing material is an alkaline substance, can emit a large amount of heat and bubbles when meeting acid, is not beneficial to use, and is neutralized by adding sodium hydroxide. Avoiding the generation of bubbles in the use process of subsequent cement, simultaneously playing the role of dispersing and adjusting viscosity, improving the workability of concrete and facilitating construction.
4. The ester group of the polyacrylic acid-acrylate copolymer can slowly release carboxyl in an alkaline environment, so that the hysteresis dispersion capacity of the product is improved, the loss of concrete is reduced, and the long-time construction of the concrete is facilitated.
According to some embodiments of the present invention, the raw materials for preparing the water-retaining agent further comprise xanthan gum, welan gum, polyacrylamide and cellulose.
According to some embodiments of the invention, the cellulose comprises at least one of hydroxypropyl methylcellulose, hydroxyethyl cellulose.
According to some embodiments of the present invention, the raw material for preparing the water-retaining agent further comprises water.
According to some embodiments of the invention, the polyacrylamide comprises polyacrylamide anions.
The addition of polyacrylamide anions ensures the dispersion of cement particles and maintains the water retention, segregation resistance and bleeding resistance of the cement gel material.
According to some embodiments of the invention, the molecular weight of the polyacrylamide anion is 300 × 10 4 ~1500×10 4
According to some embodiments of the invention, the polyacrylic acid is present in an amount of 20% to 50%.
According to some embodiments of the invention, the polyacrylic acid has a molecular weight of 3000 to 100000.
According to some embodiments of the invention, the acrylic acid-acrylate copolymer content is 20% to 50%.
According to some embodiments of the invention, the acrylic acid-acrylate copolymer has a molecular weight of 3000 to 100000.
Meanwhile, in the molecular weight interval, the action strength of polyacrylic acid on dispersed cement particles is ensured, and the viscosity regulating effect is also realized.
According to some embodiments of the present invention, the raw material for preparing the water retention agent comprises, by weight, 1 to 10 parts of the sodium hydroxide, 50 to 120 parts of the polyacrylic acid-acrylate copolymer, 50 to 150 parts of the polyacrylic acid, and 1 to 5 parts of the maltodextrin.
According to some embodiments of the present invention, the raw material for preparing the water-retaining agent comprises, by weight, 1 to 5 parts of the xanthan gum, 1 to 5 parts of the rubber, 1 to 5 parts of the polyacrylamide, and 1 to 5 parts of the cellulose.
According to some embodiments of the present invention, the water-retaining agent is prepared from 50 to 150 parts by weight of the polyacrylic acid, 50 to 120 parts by weight of the polyacrylic acid-acrylate copolymer, 5 to 10 parts by weight of the gelatin, 1 to 5 parts by weight of the polyacrylamide, 1 to 5 parts by weight of the cellulose, 1 to 5 parts by weight of the welan gum, 1 to 5 parts by weight of the xanthan gum, 1 to 5 parts by weight of the hydroxypropyl guar gum, 1 to 10 parts by weight of the sodium hydroxide, 1 to 5 parts by weight of the maltodextrin, 0.1 to 2 parts by weight of the preservative, and 698 to 917.9 parts by weight of the deionized water.
According to the preparation method of the water-retaining agent, the maltodextrin and the hydroxypropyl guar gum are dissolved, then the sodium hydroxide is added, and the polyacrylic acid-acrylate copolymer are mixed.
According to some preferred embodiments of the present invention, the preparation method of the water-retaining agent comprises the following steps:
s1, adding the cellulose, the welan gum, the xanthan gum, the hydroxypropyl guar, the polyacrylamide, the gelatin and the maltodextrin to water for dissolution;
s2, adding the sodium hydroxide, the polyacrylic acid and the polyacrylic acid-acrylate copolymer into the mixture dissolved in the step S2, and mixing.
The water-retaining agent provided by the invention belongs to an environment-friendly concrete admixture, has the advantages of simple process, readily available raw materials, no three wastes in the production process, environmental friendliness and suitability for industrial scale production.
The use of a water retaining agent according to an embodiment of the third aspect of the present invention in concrete.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference are exemplary only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example 1
The embodiment provides a water-retaining agent, which consists of the following components:
796.3g of ionized water, 1.0g of cellulose (CAS number: 9004-65-3), 1.2g of welan gum (CAS number: 96949-22-3), 1.5g of xanthan gum (CAS number: 11138-66-2), 3.5g of hydroxypropyl guar gum (CAS number: 39421-75-5), 2.0g of gelatin, 3.5g of maltodextrin (CAS number: 9050-36-6), 2.0g of polyacrylamide (CAS number: 9003-05-8), 8.0g of sodium hydroxide (CAS number: 1310-73-2), 100g of polyacrylic acid with a molecular weight of 5000 (CAS number: 9003-01-4) (mass concentration of 40%), 80g of a molecular weight poly 10000 acrylic acid-acrylate copolymer (CAS number: 25133-97-5) (mass concentration of 36%), and 1.0g of a preservative.
The gelatin is obtained from Shunhua Dow hydration Co., ltd;
the above preservatives are available from Shunhua Co., ltd.
Example 2
The embodiment prepares the water-retaining agent, and the specific steps are as follows:
s1, weighing deionized water according to the components in the embodiment 1, then adding cellulose, welan gum, xanthan gum, hydroxypropyl guar gum, gelatin, maltodextrin and polyacrylamide, and stirring for 90min until the components are completely dissolved.
S2, adding sodium hydroxide, polyacrylic acid with the molecular weight of 5000 (mass concentration is 40%) and polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (mass concentration is 36%), stirring for 60min, and adding 1g of preservative after complete dissolution. And stirring uniformly to obtain the concrete water-retaining agent.
Example 3
This example provides a water-retaining agent, which comprises the following components:
746.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 150g of polyacrylic acid with the molecular weight of 5000 (mass concentration of 40%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (mass concentration of 36%) and 1.0g of preservative.
Example 4
This example prepares a water retaining agent and example 2 except that it is prepared according to the weight of the components in example 3 and the rest of the conditions are the same as example 2.
Example 5
The embodiment provides a water-retaining agent, which consists of the following components:
776.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 5000 (the mass concentration is 40%), 100g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (the mass concentration is 36%) and 1.0g of preservative.
Example 6
This example prepares a water retaining agent and example 2 except that it is prepared according to the weight of the components in example 5 and the rest of the conditions are the same as example 2.
Example 7
This example provides a water-retaining agent, which comprises the following components:
850.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 80g of polyacrylic acid with the molecular weight of 20000 (the mass concentration is 30%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (the mass concentration is 36%) and 1.0g of preservative.
Example 8
This example prepared a water retaining agent and example 2 except that it was prepared according to the weight of the components in example 7, and the remaining conditions were the same as example 2.
Example 9
This example provides a water-retaining agent, which comprises the following components:
796.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 50000 (the mass concentration is 28%), 80g of a 10000-molecular-weight polyacrylic acid-acrylate copolymer (the mass concentration is 36%) and 1.0g of a preservative.
Example 10
This example prepared a water retaining agent and example 2 except that it was prepared according to the weight of the components in example 9, and the remaining conditions were the same as example 2.
Example 11
The embodiment provides a water-retaining agent, which consists of the following components:
796.3g of ionized water, 3.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 50000 (the mass concentration is 28%), 80g of a 10000-molecular-weight polyacrylic acid-acrylate copolymer (the mass concentration is 36%) and 1.0g of a preservative.
Example 12
This example prepared a water retaining agent and example 2 except that it was prepared according to the weight of the components in example 11, and the remaining conditions were the same as example 2.
Example 13
This example provides a water-retaining agent, which comprises the following components:
794.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 4.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 5000 (the mass concentration is 40%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (the mass concentration is 36%) and 1.0g of preservative.
Example 14
This example prepared a water retaining agent and example 2 except that it was prepared according to the weight of the components in example 13 and the remaining conditions were the same as example 2.
Example 15
This example provides a water-retaining agent, which comprises the following components:
794.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 5.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 5000 (mass concentration of 40%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (mass concentration of 36%) and 1.0g of preservative.
Example 16
This example prepared a water retaining agent and example 2 except that it was prepared according to the weight of the components in example 15, and the remaining conditions were the same as example 2.
Example 17
This example provides a water-retaining agent, which comprises the following components:
794.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 3.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 5000 (mass concentration of 40%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (mass concentration of 36%) and 1.0g of preservative.
Example 18
This example prepares a water retaining agent and example 2 except that it is prepared according to the weight of the components in example 17 and the rest of the conditions are the same as example 2.
Example 19
This example provides a water-retaining agent, which comprises the following components:
794.3g of ionized water, 1.0g of cellulose, 3.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 5000 (the mass concentration is 40%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (the mass concentration is 36%) and 1.0g of preservative.
Example 20
This example prepares a water retaining agent and example 2 except that it is prepared according to the weight of the components in example 19 and the rest of the conditions are the same as example 2.
Example 21
This example provides a water-retaining agent, which comprises the following components:
794.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 5.5g of maltodextrin, 2.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 5000 (the mass concentration is 40%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (the mass concentration is 36%) and 1.0g of preservative.
Example 22
This example prepared a water retaining agent and example 2 except that it was prepared according to the weight of the components in example 21, and the remaining conditions were the same as example 2.
Example 23
This example provides a water-retaining agent, which comprises the following components:
794.3g of ionized water, 1.0g of cellulose, 1.2g of welan gum, 1.5g of xanthan gum, 3.5g of hydroxypropyl guar gum, 2.0g of gelatin, 3.5g of maltodextrin, 4.0g of polyacrylamide, 8.0g of sodium hydroxide, 100g of polyacrylic acid with the molecular weight of 5000 (the mass concentration is 40%), 80g of polyacrylic acid-acrylate copolymer with the molecular weight of 10000 (the mass concentration is 36%) and 1.0g of preservative.
Example 24
This example prepared a water retaining agent and example 2 except that it was prepared according to the weight of the components in example 23 and the remaining conditions were the same as example 2.
Comparative example 1
The comparative example provides a water retaining agent, and the comparative example 1 is different from the example 1 in that sodium hydroxide in the example 1 is not included, and the rest conditions are the same.
Comparative example 2
A water retaining agent was prepared in this comparative example, and this comparative example 2 is different from example 2 in that it was prepared according to the weight of each component in comparative example 1, and the rest of the conditions were the same as in example 2.
Comparative example 3
The comparative example provides a water retention agent, and the comparative example 1 and the example 1 are different in that the polyacrylic acid-acrylate copolymer of the example 1 is not included, and the rest conditions are the same.
Comparative example 4
A water retaining agent was prepared in this comparative example, and this comparative example 2 differs from example 2 in that it was prepared according to the weight of each component in comparative example 3, and the rest of the conditions were the same as in example 2.
Comparative example 5
The comparative example provides a water retaining agent, and the comparative example 1 and the example 1 are different in that gelatin in the example 1 is not included, and the rest conditions are the same.
Comparative example 6
A water retaining agent was prepared in this comparative example, and this comparative example 2 is different from example 2 in that it was prepared according to the weight of each component in comparative example 5, and the rest of the conditions were the same as in example 2.
Comparative example 7
The comparative example provides a water retaining agent, and the comparative example 1 differs from example 1 in that the hydroxypropyl guar gum of example 1 is not included, and the other conditions are the same.
Comparative example 8
A water retaining agent was prepared in this comparative example, and this comparative example 2 differs from example 2 in that it was prepared according to the weight of each component in comparative example 7, and the remaining conditions were the same as in example 2.
Comparative example 9
The comparative example provides a water retention agent, and the comparative example 1 and the example 1 are different in that the maltodextrin in the example 1 is not included, and the other conditions are the same.
Comparative example 10
A water retaining agent was prepared in this comparative example, and this comparative example 2 is different from example 2 in that it was prepared according to the weight of each component in comparative example 9, and the rest of the conditions were the same as in example 2.
Test example 1
The concrete water retention verification of the water retention agent prepared in the above examples and comparative examples comprises the following steps:
the concrete mix formulation is shown in table 1:
table 1: concrete mixing ratio (kg/m) 3 )
Equal strength of strength Cement Fly ash Sand Crushing stone Water (W)
C30 260 80 900 1030 165
Wherein the cement is PO42.5 cement in the south of Taojiang, the fly ash is second-strength fly ash, the sand is machine-made sand with the fineness modulus of 3.0, the particle size of the broken stone is 5mm-40mm, and simultaneously, 0.3 percent of water-retaining agent is added into 9 percent of polycarboxylic acid water reducing agent.
The working performance of the concrete mixture is tested according to a detection method in GB/T50080-2016 Standard test method for Performance of common concrete mixtures.
The concrete bleeding rate detection method specifically comprises the following steps:
1. immediately weighing the inner wall of the volumetric cylinder after the inner wall of the volumetric cylinder is wetted by wet cloth, and recording the mass of the volumetric cylinder;
2. filling the concrete mixture into a volumetric cylinder;
3. wiping the opening and the outer surface of the cylinder, weighing and recording the mass of the volumetric cylinder and the sample, covering the cylinder cover and starting timing;
4. sucking the surface bleeding of the sample for 1 time every 10min within 60min after the timing is started; after 60min, sucking the surface of the sample for 1 time every 30min until no more bleeding occurs.
The bleeding rate was calculated according to the following formula: b = V W /[(W/m T )·m];
m=m 1 -m 2
Wherein, V W Is the total bleeding amount (mL), m is the sample mass (g) of the concrete mixture, mT is the total mass (g) of the tested mixed concrete mixture, W is the water consumption (mL) of the tested mixed concrete mixture, m is the water consumption (mL) of the tested mixed concrete mixture 1 Is the volumetric cylinder mass (g), m 2 The volumetric cylinder and the total mass (g) of the sample were obtained.
The concrete mixture workability test results are shown in table 2:
table 2: working performance of concrete
Figure BDA0003731342720000081
Figure BDA0003731342720000091
As can be seen from table 2: the bleeding rate and the concrete slump of the examples are lower than those of the comparative examples. Therefore, the water-retention and viscosity-control agent prepared by the invention can reduce the viscosity and bleeding rate of concrete, and meanwhile, the water-retention agent has a better improvement effect on the viscosity of the concrete, so that the fluidity of the concrete can be effectively improved.
While the present invention has been described in detail with reference to the embodiments thereof, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. The water-retaining agent is characterized in that the preparation raw materials comprise sodium hydroxide, polyacrylic acid-acrylate copolymer, polyacrylic acid, gelatin, hydroxypropyl guar gum and maltodextrin.
2. The water retaining agent as claimed in claim 1, wherein the raw materials for preparing the water retaining agent further comprise xanthan gum, welan gum, polyacrylamide and cellulose.
3. The water-retaining agent according to claim 1, wherein the solid content of polyacrylic acid is 20% to 50%.
4. The water-retaining agent according to claim 1, characterized in that the molecular weight of the polyacrylic acid is 3000 to 100000.
5. The water retaining agent as claimed in claim 1, wherein the acrylic acid-acrylate copolymer has a solid content of 20-50%.
6. The water-retaining agent according to claim 1, characterized in that the molecular weight of the acrylic acid-acrylate copolymer is 3000 to 100000.
7. The water-retaining agent according to claim 1, wherein the raw materials for preparation comprise, by weight, 1 to 10 parts of the sodium hydroxide, 50 to 120 parts of the polyacrylic acid-acrylate copolymer, 50 to 150 parts of the polyacrylic acid and 1 to 5 parts of the maltodextrin.
8. The water-retaining agent according to claim 2, wherein the raw materials for preparation comprise, by weight, 1 to 5 parts of the xanthan gum, 1 to 5 parts of the welan gum, 1 to 5 parts of the polyacrylamide and 1 to 5 parts of the cellulose.
9. A process for the preparation of the water retaining agent according to any one of claims 1 to 8 comprising adding the sodium hydroxide after dissolution of the maltodextrin and the hydroxypropyl guar, and mixing the polyacrylic acid and the polyacrylic acid-acrylate copolymer.
10. Use of a water retaining agent according to any one of claims 1 to 8 in concrete.
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