Phosphorylated polycondensate as well as preparation method and application thereof

Abstract

The invention relates to a phosphorylated polycondensate as well as a preparation method and application thereof. The phosphorylated polycondensate is a polycondensation product of an aromatic compound monomer containing a phosphate group, an aromatic compound monomer containing a polyether chain segment and a monomer with crosslinking reactivity. The polycondensate high-efficiency water reducing agent has good concrete workability, and the viscosity of slurry is remarkably reduced; and meanwhile, the method is also suitable for fly ash and slag type concrete buildings, reduces a large amount of carbon dioxide emission in cement production, and has certain economic and social benefits.

Description

Technical Field

[0001] The invention relates to the field of concrete admixtures, and in particular to a phosphated polycondensate, a preparation method and application thereof as a high-efficiency water reducing agent. Background Art

[0002] Polycarboxylic acid water-reducing agent has become the most important product in the current concrete admixture market due to its advantages such as low dosage, high water reduction rate, good collapse retention performance, strong adjustability of molecular structure, and green environmental protection.

[0003] With the deepening of theoretical research and engineering applications, the raw material situation of concrete is becoming increasingly severe. The use of industrial by-product gypsum as a cement setting agent leads to a high sulfate content in cementitious materials. The widespread use of fly ash, slag, coal gangue, etc. makes the composition of cementitious materials more complex. People have found that polycarboxylic acid water reducers have compatibility problems with concrete materials, resulting in a significant decrease in the initial fluidity and flow retention capacity of concrete, and abnormal coagulation. In order to solve some application problems of traditional polycarboxylic acid water reducers, engineers and researchers have introduced highly adsorbable phosphoric acid or phosphorous acid groups. On the one hand, the added phosphoric acid or phosphorous acid groups have stronger charge attraction than carboxyl groups; on the other hand, phosphoric acid or phosphorous acid groups can increase the tolerance of the water reducer itself to calcium ions in the cement slurry system.

[0004] In view of the poor quality of concrete aggregates and admixtures in the current market, it is necessary to develop highly adaptable water reducers, break through the limitations of traditional water reducers, conduct innovative research on water reducer adsorption groups and molecular skeletons, comprehensively improve performance, and provide important support for the development of modern concrete technology. Summary of the invention

[0005] The present application provides a phosphorylated polycondensate, which is a polycondensation product of an aromatic compound monomer containing a phosphoric acid group, an aromatic compound monomer containing a polyether segment, and a monomer having cross-linking reactivity, wherein:

[0006] The aromatic compound monomer containing a phosphate group includes at least two parts containing a phosphate group existing at different positions of the aromatic ring.

[0007] The molar ratio of the aromatic compound monomer containing a phosphoric acid group: the monomer having cross-linking reactivity: the aromatic compound monomer containing a polyether segment is 1.5-3.5:1-3:1.

[0008] In one embodiment, the weight average molecular weight of the phosphorylated condensation polymer is 10,000-50,000; and the molecular weight distribution is 1.1-1.8.

[0009] In one embodiment, the aromatic compound monomer containing a phosphate group has the following structural formula:

[0010]

[0011] Wherein, R1 and R2 are each independently -(CH2) m -or-(OCH2CH2) n -, wherein m and n are each independently a natural number ranging from 0 to 5.

[0012] In one embodiment, the aromatic compound monomer containing a phosphate group is a phosphorylated product of an aromatic alcohol or an aromatic alcohol ether;

[0013] Preferably, the aromatic alcohol or aromatic alcohol ether has the following structural formula

[0014]

[0015] Wherein, R1 and R2 are each independently -(CH2) m -or-(OCH2CH2) n -, where m and n are each independently a natural number from 0 to 5;

[0016] The phosphorylation agent is one or more of phosphorus pentoxide, phosphoric acid, polyphosphoric acid, pyrophosphoric acid, phosphorus oxychloride and the like.

[0017] In one embodiment, the monomer having cross-linking reactivity is an aldehyde compound, preferably one or more selected from formaldehyde, paraformaldehyde, acetaldehyde and benzaldehyde compounds.

[0018] In one embodiment, the aromatic compound monomer containing the polyether chain segment is a polymerization product of an aromatic alcohol with active hydrogen and ethylene oxide / propylene oxide; preferably, the molecular weight of the polyether chain segment is 500-7000.

[0019] In a second aspect, the present application also provides a method for preparing a phosphorylated polycondensate, which comprises subjecting an aromatic compound monomer containing a phosphoric acid group, an aromatic compound monomer containing a polyether segment, and a monomer having cross-linking reactivity to a polycondensation reaction in the presence of an acid catalyst to obtain the phosphorylated polycondensate;

[0020] The aromatic compound monomer containing a phosphate group includes at least two parts containing a phosphate group existing at different positions of the aromatic ring.

[0021] The molar ratio of the aromatic compound monomer containing a phosphoric acid group: the monomer having cross-linking reactivity: the aromatic compound monomer containing a polyether segment is 1.5-3.5:1-3:1.

[0022] In one embodiment, the acid catalyst is selected from one or more of sulfonic acid, sulfuric acid, glacial acetic acid, hydrochloric acid, methanesulfonic acid, 2-hydroxybenzenesulfonic acid, 3-hydroxybenzenesulfonic acid, 4-hydroxybenzenesulfonic acid and formic acid.

[0023] In one embodiment, after the polycondensation reaction, the reaction product is further neutralized with a pH adjuster, wherein the pH adjuster is selected from one or more of potassium hydroxide, sodium hydroxide, calcium hydroxide, and amine substances.

[0024] The present application also relates to the use of the phosphated polycondensate of the present application as a water reducing agent.

[0025] When the phosphorylated polycondensate of the present application is used as a water reducer, it is suitable for the preparation of high-strength concrete and self-compacting concrete, and is especially suitable for the preparation of reduced-viscosity concrete and concrete with high requirements for low water-cement ratio. It is also suitable for fly ash and slag concrete buildings, reducing a large amount of carbon dioxide emissions in cement production, and has certain economic and social benefits. The polycondensate high-efficiency water reducer has good concrete and workability, significantly reduces the viscosity of the slurry; it is also suitable for fly ash and slag concrete buildings, reducing a large amount of carbon dioxide emissions in cement production, and has certain economic and social benefits. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below through examples. Through these examples, the features and advantages of the present invention will become clearer and more specific.

[0027] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0028] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] On the one hand, the present application provides a phosphorylated polycondensate, which is a polycondensation product of an aromatic compound monomer containing a phosphoric acid group, an aromatic compound monomer containing a polyether segment, and a monomer having crosslinking reactivity, wherein:

[0030] The aromatic compound monomer containing a phosphate group comprises at least two parts containing a phosphate group existing at different positions of the aromatic ring,

[0031] The molar ratio of the aromatic compound monomer containing a phosphoric acid group: the monomer having cross-linking reactivity: the aromatic compound monomer containing a polyether segment is 1.5-3.5:1-3:1.

[0032] In the present application, the aromatic compound monomer containing a phosphate group includes at least two moieties containing a phosphate group present at different positions of the aromatic ring, which means that the moieties containing a phosphate group may be the same or different, but both contain a phosphate group, and the number of the moieties is at least 2, such as 2, 3 or 4. These moieties containing a phosphate group are respectively connected to different positions of the aromatic ring, for example, when there are two moieties containing a phosphate group, both of them may be located at the para position.

[0033] In one embodiment, the aromatic compound monomer containing a phosphate group has the following structural formula:

[0034]

[0035] Wherein, R1 and R2 are each independently -(CH2) m -or-(OCH2CH2) n -, wherein m and n are each independently a natural number ranging from 0 to 5.

[0036] In one embodiment, the aromatic compound monomer containing a phosphate group is a phosphorylated product of an aromatic alcohol or an aromatic alcohol ether;

[0037] Preferably, the aromatic alcohol or aromatic alcohol ether has the following structural formula

[0038]

[0039] Wherein, R1 and R2 are each independently -(CH2) m -or-(OCH2CH2) n -, where m and n are each independently a natural number from 0 to 5;

[0040] The phosphorylation agent is one or more of phosphorus pentoxide, phosphoric acid, polyphosphoric acid, pyrophosphoric acid, phosphorus oxychloride and the like.

[0041] Specifically, aromatic alcohol or aromatic alcohol ether is mixed with a phosphorylating agent under certain temperature conditions, and reacted in the presence of an optional catalyst to obtain an aromatic compound monomer containing a phosphoric acid group. The reaction temperature may be 0° C. to 150° C. No catalyst may be added during the reaction. When a catalyst is used, the catalyst may be an acid such as sulfuric acid.

[0042] The aromatic compound monomer containing a phosphate group contains an aromatic ring such as a benzene ring, and there are two structures containing a phosphate group at the para position of the benzene ring. Due to the rigidity of the aromatic ring such as the benzene ring, one of the two phosphate groups is not easily adsorbed, but it provides additional repulsive force, increasing the spatial repulsive force provided by the EO / PO chain. Such a structure is beneficial for the formed phosphated polycondensate to be used as a high-efficiency water reducing agent, which is beneficial for reducing the air content of concrete, and improving expansion, slump and backflow time, etc.

[0043] The aromatic compound monomer containing a polyether segment is a polymerization product of an aromatic alcohol with active hydrogen and ethylene oxide / propylene oxide. The aromatic compound monomer containing a polyether segment contains a polyether segment formed by ethylene oxide and / or propylene oxide, and preferably, the molecular weight of the polyether segment is 500-7000. Such a structure has the following advantages for the formed phosphated polycondensate as a high-efficiency water reducer: the long-chain polyether segment side chain can provide a strong steric hindrance effect, better improve the dispersion retention performance of the phosphated polycondensate of the present application, so that the phosphated polycondensate of the present application has excellent dispersibility and obvious viscosity reduction effect.

[0044] Specifically, the aromatic alcohol with active hydrogen used to form the aromatic compound monomer containing the polyether segment can be aromatic-1-alcohol, aromatic alkyl-alcohol. The aromatic compound monomer containing the polyether segment can be synthesized as follows: a quantitative amount of aromatic alcohol is added to the reactor, N2 is introduced for substitution, a total amount of 0.05-1.5% of catalyst is added, and the reactor is heated and stirred. The reaction pressure is controlled to be less than 0.4MPa, ethylene oxide and / or propylene oxide are introduced at a certain temperature, heat-insulated and aged, and then the temperature is lowered and neutralized to a pH value of 6-7 to discharge the material, and the aromatic compound monomer containing the polyether segment is obtained. When the polyether segment is formed by ethylene oxide and propylene oxide, ethylene oxide can be introduced first, and after all ethylene oxide is added, propylene oxide is added after heat-insulated and aged, and then heat-insulated and aged. The reaction temperature can be 80°C-200°C. Aromatic-1-alcohol can be, for example, phenol, and aromatic alkyl-alcohol can be, for example, benzyl alcohol, phenylethyl alcohol, etc.

[0045] In one embodiment, the monomer with cross-linking reactivity is an aldehyde compound, preferably one or more selected from formaldehyde, paraformaldehyde, acetaldehyde and benzaldehyde. The aromatic compound monomer containing a phosphate group has a reactive activity at the ortho position of the group part due to the presence of a group part containing a phosphate group on an aromatic ring such as a benzene ring; similarly, the aromatic compound monomer containing a polyether segment also has a group part containing a polyether segment on an aromatic ring such as a benzene ring, so that the ortho position of the group part is also reactive. Thus, the aromatic compound monomers containing a phosphate group, the aromatic compound monomers containing a polyether segment, and the aromatic compound monomers containing a phosphate group and the aromatic compound monomers containing a polyether segment can be connected by the monomer with cross-linking reactivity, thereby obtaining the phosphorylated polycondensate of the present application. It should be noted that in the phosphorylated polycondensate of the present application, the structural units derived from the aromatic compound monomers containing a phosphate group and the structural units derived from the aromatic compound monomers containing a polyether segment exist in a random manner.

[0046] As an exemplary illustration, the phosphorylated polycondensate may have the following comb-shaped structure, including three structural units derived from aromatic compound monomers containing phosphoric acid groups, aromatic compound monomers containing polyether segments, and monomers having cross-linking reactivity:

[0047]

[0048] This comb-shaped structure utilizes the fact that the adsorption performance of the phosphate group on the cementitious material is better than that of other adsorption groups, and multiple structures containing the phosphate group are distributed at different positions of the aromatic ring, which can form a good hydrophilic adsorption layer with the aromatic ring; it can also utilize the rigidity of the aromatic ring to provide additional repulsive force, and enhance the spatial repulsive force provided by the EO / PO chain, so that under the action of the EO / PO long side chain, it can provide a condensation product with excellent dispersion performance and obvious viscosity reduction effect, which is suitable for the configuration of high-strength concrete and self-compacting concrete, especially suitable for the configuration of viscosity-reducing concrete and concrete with high requirements for low water-cement ratio.

[0049] In one embodiment, the weight average molecular weight of the phosphated polycondensate of the present application is 10,000-50,000; the molecular weight distribution is 1.1-1.8.

[0050] The present application also relates to a method for preparing a phosphorylated polycondensate, which comprises subjecting an aromatic compound monomer containing a phosphoric acid group, an aromatic compound monomer containing a polyether segment, and a monomer having crosslinking reactivity to a polycondensation reaction in the presence of an acid catalyst to obtain the phosphorylated polycondensate.

[0051] In one embodiment, the reaction temperature of the polycondensation reaction is 100-150° C., the reaction time is 1-10 h, and the pH is 1-3.

[0052] In one embodiment, the acid catalyst is selected from one or more of sulfonic acid, sulfuric acid, glacial acetic acid, hydrochloric acid, methanesulfonic acid, 2-hydroxybenzenesulfonic acid, 3-hydroxybenzenesulfonic acid, 4-hydroxybenzenesulfonic acid and formic acid.

[0053] In one embodiment, after the polycondensation reaction, the reaction product is further neutralized with a pH adjuster, wherein the pH adjuster is selected from one or more of potassium hydroxide, sodium hydroxide, calcium hydroxide, and amine substances.

[0054] The phosphated polycondensate of the present application has good concrete and workability, can significantly reduce the viscosity of the slurry, and can be used as a cement water reducer. The above phosphated polycondensate aqueous solution that has undergone polycondensation reaction and neutralization can be controlled to have a solid content of less than or equal to 40%, thereby obtaining a high-efficiency water reducer, which is suitable for configuring high-strength concrete, self-compacting concrete, and especially suitable for configuring reduced-viscosity concrete and concrete with high requirements for low water-cement ratio. It is also suitable for fly ash and slag concrete buildings, reducing a large amount of carbon dioxide emissions in cement production, and has certain economic and social benefits.

[0055] Hereinafter, a polyphosphorylated polycondensation high-efficiency water reducer and a preparation method thereof of the present invention will be described in detail in conjunction with specific embodiments.

[0056] Preparation of Monomer A Aromatic Phosphate Ester Compounds

[0057] LP-1 Phosphate Compound:

[0058] Heat 356.4 g of hydroquinone dihydroxyethyl ether and 98 g of phosphoric acid in a reaction bottle to 100° C., stir for 10 minutes, add 78.4 g of sulfuric acid, install a condenser, heat under reflux for 3 hours, and after cooling, obtain the aromatic ring phosphate compound LP-1.

[0059] LP-2 Phosphate Compound:

[0060] Heat 237.6 g of hydroquinone dihydroxyethyl ether and 115.3 g of polyphosphoric acid in a reaction bottle to 120° C., stir for 10 minutes, add 19.6 g of sulfuric acid, install a condenser, heat under reflux for 3 hours, and after cooling, obtain the aromatic ring phosphate compound LP-2.

[0061] LP-3 phosphate compound:

[0062] 198 g of hydroquinone and 115.3 g of polyphosphoric acid were heated to 100° C. in a reaction bottle, stirred for 10 min, 49 g of sulfuric acid was added, a condenser was installed, and the mixture was heated under reflux for 3 h. After cooling, the aromatic ring phosphate compound LP-3 was obtained.

[0063] LP-4 phosphate compound:

[0064] Heat 363 g of 4-hydroxyethyloxyethyl-1-hydroxyethylbenzene diether and 98 g of phosphoric acid in a reaction bottle to 100° C., stir for 10 min, add 39.2 g of sulfuric acid, install a condenser, heat under reflux for 3 h, and after cooling, obtain the aromatic ring phosphate compound LP-4.

[0065] Example 1

[0066] In a glass reactor equipped with a thermometer, a stirrer and a reflux condenser, 135.5 g of LP-1 phosphate compound and 64 g of phenol ether (M300, purchased from Liaoning Aoke Chemical Co., Ltd. under the trade name PHPEG-300) were added, the temperature was raised to 110°C and stirred, 38 g of sulfuric acid was added, 135 g of formaldehyde aqueous solution (37%) was slowly added, and the reaction lasted for 3.5 hours, and 26 g of neutralizing agent NaOH was added to adjust the system pH to 7-9 to obtain a high-performance polycondensate water reducer with a concentration of 40%. The weight average molecular weight of the polycondensate determined by aqueous gel chromatography was 21,000, and the molecular weight distribution was 1.26. That is SW-1.

[0067] Example 2

[0068] In a glass reactor equipped with a thermometer, a stirrer and a reflux condenser, 106 g of LP-2 phosphate compound and 127 g of phenol ether (M1000, purchased from Liaoning Aoke Chemical Co., Ltd. under the trade name PHPEG-1000) were added, the temperature was raised to 120°C and stirred, 40 g of benzenesulfonic acid was added, 106 g of paraformaldehyde was slowly added, and the reaction lasted for 4 hours, and 20 g of neutralizing agent KOH was added to adjust the system pH to 7-9 to obtain a high-performance polycondensate water reducer with a concentration of 40%. The weight average molecular weight of the polycondensate determined by aqueous gel chromatography was 22300, and the molecular weight distribution was 1.33. That is SW-2.

[0069] Example 3

[0070] In a glass reactor equipped with a thermometer, a stirrer and a reflux condenser, 73g of LP-3 phosphate compound and 245g of phenol ether (M3000, purchased from Liaoning Aoke Chemical Co., Ltd. under the trade name PHPEG-3000) were added, the temperature was raised to 120°C and stirred, 8g of sulfuric acid was added, and 63g of paraformaldehyde was slowly added. After the reaction lasted for 4.5h, 10g of neutralizing agent NaOH was added, and the pH of the system was adjusted to 7-9 to obtain a high-performance polycondensate water reducer with a concentration of 40%. The weight average molecular weight of the polycondensate determined by aqueous gel chromatography was 26500, and the molecular weight distribution was 1.19. That is SW-3.

[0071] Example 4

[0072] In a glass reactor equipped with a thermometer, a stirrer and a reflux condenser, 72g of LP-4 phosphate compound and 292g of phenol ether (M2000, purchased from Liaoning Aoke Chemical Co., Ltd. under the trade name PHPEG-2000) were added, the temperature was raised to 130°C and stirred, 16g of sulfuric acid was added, 5.2g of paraformaldehyde was slowly added, and the reaction lasted for 4 hours, and 13g of neutralizing agent polyethyleneimine was added, and the pH of the system was adjusted to 7-9 to obtain a high-performance polycondensate water reducer with a concentration of 40%. The weight average molecular weight of the polycondensate determined by aqueous gel chromatography was 21300, and the molecular weight distribution was 1.35. That is SW-4.

[0073] Example 5

[0074] In a glass reactor equipped with a thermometer, a stirrer and a reflux condenser, 40.5 g of LP-2 phosphate compound and 318 g of phenol ether (M4000, purchased from Liaoning Aoke Chemical Co., Ltd. under the trade name PHPEG-4000) were added, the temperature was raised to 120°C and stirred, 13 g of benzenesulfonic acid was added and 20 g of acetaldehyde was slowly added, and the reaction lasted for 3.5 hours, and 10 g of neutralizing agent NaOH was added to adjust the system pH to 7-9 to obtain a high-performance polycondensate water reducer with a concentration of 40%. The weight average molecular weight of the polycondensate determined by aqueous gel chromatography was 21660, and the molecular weight distribution was 1.28. That is SW-5.

[0075] Example 6

[0076] In a glass reactor equipped with a thermometer, a stirrer and a reflux condenser, 66g of LP-2 phosphate compound and 296g of phenol ether (M5000, purchased from Liaoning Aoke Chemical Co., Ltd. under the trade name PHPEG-5000) were added, the temperature was raised to 110°C and stirred, 14g of sulfuric acid was added, 8.5g of benzaldehyde was slowly added, and the reaction lasted for 4 hours, and 13g of neutralizing agent KOH was added to adjust the system pH to 7-9 to obtain a high-performance polycondensate water reducer with a concentration of 40%. The weight average molecular weight of the polycondensate determined by aqueous gel chromatography was 24900, and the molecular weight distribution was 1.18. That is SW-6.

[0077] Comparative Example 1

[0078] 120.0 g of deionized water was added to a four-necked flask equipped with a stirrer, a thermometer, and a dropping device. The mixture was stirred and heated to 60° C., 190.6 g of HPEG polyether was added, and after the above monomers were dissolved, 6 g of acrylic acid was added, and then an initiator (a mixture of 3 g of ammonium persulfate and 60 g of water) and a chain transfer agent (a mixture of 4 g of thioglycolic acid and 40 g of water) were added dropwise at a uniform speed for 3 hours, and the aging time was 1 hour. After the reaction was completed, the system temperature was lowered to room temperature, and the pH value of the mixture obtained by the reaction was adjusted to neutral with a 30% mass concentration of NaOH aqueous solution. The material was discharged to obtain a high-performance polycarboxylate water-reducing agent product PCE-1, the solid content of the obtained product was 40%, and the weight-average molecular weight of the obtained polymer was 35,000.

[0079] Comparative Example 2

[0080] MPSP-1 was obtained by referring to Example 1 (Synthesis of polycondensate water reducer MPSP-1) in patent CN115260485A.

[0081] The water reducing agent synthesized in the above Examples 1 to 6 and Comparative Examples 1 to 2 is mixed with cement, sand, gravel, water and other admixtures in a certain mixing ratio according to JGJ55-2011. Various concrete test materials and ambient temperature are maintained at (20±3)°C; other parameters or detailed descriptions please refer to GB / 8076-2008.

[0082] The weight average molecular weight of the water reducing agent in the examples and comparative examples was measured using an American Beckman multi-angle laser scattering instrument.

[0083] The fresh concrete of the phosphorylated polycondensate high efficiency water reducer (Examples 1 to 6) of the present invention and the polycarboxylate water reducer of Comparative Examples 1 to 2 were compared. Specific test results are shown in Table 1.

[0084] Table 1 Evaluation data of phosphated polycondensation high-efficiency water-reducing agent concrete

[0085]

[0086] From the concrete evaluation data of the polyphosphorylated polycondensate high-efficiency water reducer in Table 1, it can be seen that under the condition of the same concrete dosage, the performance of the water reducer in the embodiment of the present invention is better than that of the water reducer in the comparative example. For example, the backflow time of the SW-1 water reducer is 7s faster than that of the water reducer in the comparative example PCE-1, and the slump and expansion of the SW-1 water reducer are greater than the fluidity of the water reducer in the comparative example PCE-1, and the workability is good; the air content of MPSP-1 in the comparative example-2 is lower, and the expansion, slump and backflow time are better than those of MPSP-1.

[0087] It can be seen from the data in Table 1 that, under the same concrete dosage conditions, the embodiments 1-6 of the phosphorylated polycondensate high-efficiency water reducer of the present invention have the same slump and expansion performance as the concrete without fly ash; when compared with the comparative example PCE-1, the effect of adding fly ash to the concrete is better than that of the comparative example PCE-1. After adding fly ash to the comparative example PCE-1, the slump and expansion of the concrete are significantly reduced. Under the same concrete performance conditions, the amount of cement used in the present invention is reduced, and the fly ash, a byproduct of coal-fired power plants with a relatively low price, is used instead, which not only saves materials, but also reduces environmental pollution, and has good economic and social benefits.

[0088] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A phosphorylated polycondensate, which is a polycondensation product of an aromatic compound monomer containing a phosphoric acid group, an aromatic compound monomer containing a polyether segment, and a monomer having crosslinking reactivity, wherein: in, The aromatic compound monomer containing a phosphoric acid group comprises at least two phosphoric acid group-containing parts existing at different positions of the aromatic ring, The molar ratio of the aromatic compound monomer containing a phosphoric acid group: the monomer having cross-linking reactivity: the aromatic compound monomer containing a polyether segment is 1.5-3.5:1-3:

1.

2. The phosphated polycondensate according to claim 1, wherein The weight average molecular weight of the phosphorylated polycondensate is 10,000-50,000, and the molecular weight distribution is 1.1-1.

8.

3. The phosphorylated polycondensate according to claim 1, wherein The aromatic compound monomer containing a phosphate group has the following structural formula: Wherein, R1 and R2 are each independently -(CH2) m -or-(OCH2CH2) n -, wherein m and n are each independently a natural number ranging from 0 to 5.

4. The phosphorylated polycondensate according to claim 3, wherein The aromatic compound monomer containing a phosphate group is a phosphorylated product of an aromatic alcohol or an aromatic alcohol ether; Preferably, the aromatic alcohol or aromatic alcohol ether has the following structural formula Wherein, R1 and R2 are each independently -(CH2) m -or-(OCH2CH2) n -, where m and n are each independently a natural number from 0 to 5; The phosphorylation agent is one or more of phosphorus pentoxide, phosphoric acid, polyphosphoric acid, pyrophosphoric acid, phosphorus oxychloride and the like.

5. The phosphorylated polycondensate according to claim 1, wherein The monomer having cross-linking reactivity is an aldehyde compound, preferably one or more selected from formaldehyde, paraformaldehyde, acetaldehyde and benzaldehyde compounds.

6. The phosphorylated polycondensate according to claim 1, wherein The aromatic compound monomer containing the polyether chain segment is a polymerization product of aromatic alcohol with active hydrogen and ethylene oxide / propylene oxide; preferably, the molecular weight of the polyether chain segment is 500-7000.

7. A method for preparing a phosphorylated polycondensate, comprising subjecting an aromatic compound monomer containing a phosphoric acid group, an aromatic compound monomer containing a polyether segment, and a monomer having crosslinking reactivity to a polycondensation reaction in the presence of an acid catalyst to obtain the phosphorylated polycondensate; in, The aromatic compound monomer containing a phosphoric acid group comprises at least two phosphoric acid group-containing parts existing at different positions of the aromatic ring, The molar ratio of the aromatic compound monomer containing a phosphoric acid group: the monomer having cross-linking reactivity: the aromatic compound monomer containing a polyether segment is 1.5-3.5:1-3:

1.

8. The method according to claim 7, wherein: The acid catalyst is selected from one or more of sulfonic acid, sulfuric acid, glacial acetic acid, hydrochloric acid, methanesulfonic acid, 2-hydroxybenzenesulfonic acid, 3-hydroxybenzenesulfonic acid, 4-hydroxybenzenesulfonic acid and formic acid.

9. The method according to claim 7, wherein: After the polycondensation reaction, the reaction product is neutralized with a pH adjuster, wherein the pH adjuster is selected from one or more of potassium hydroxide, sodium hydroxide, calcium hydroxide, and amine substances.

10. Use of the phosphated polycondensate according to any one of claims 1 to 6 as a water reducing agent.

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