Phosphating monomer as well as preparation method and application thereof

Abstract

The invention discloses a phosphating monomer as well as a preparation method and application thereof. The phosphating monomer is prepared from acrylic acid hydroxyl ester, a dispersing solvent, phosphorus pentoxide and a polymerization inhibitor. The phosphating monomer has the following structure: # imgabs0 # R1 and R2 are independently selected from any one of the following groups: # imgabs1 # imgabs2 # imgabs3 #. The preparation process of the phosphating monomer provided by the invention is simple, the phosphating monomer can be prepared by using conventional water reducing agent generation equipment, other equipment does not need to be purchased, the equipment consumption is greatly reduced, the energy consumption is low, and the phosphating monomer has good economical efficiency; the prepared polycarboxylate-type water reducer has good dispersion and mud resistance, and besides, the polycarboxylate-type water reducer has a phosphate group with strong adsorption capacity and a carboxylic acid group, so that a better water reducing effect is provided; the novel monomer is synthesized to directly replace an acrylic monomer in the synthetic raw materials of the polycarboxylate superplasticizer, so that the polycarboxylate superplasticizer has better dispersing performance and mud resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a phosphating monomer and a preparation method and application thereof. Background Art

[0002] As a new generation of high-efficiency water reducer, polycarboxylic acid high-performance water reducer (PCE) is widely used in the concrete industry due to its excellent performance. With the surge in engineering volume, sand and gravel mining has increased year by year, but sand and gravel with excellent performance and good grading has decreased year by year, and has been replaced by sand and gravel materials with a high mud content. PCE is very sensitive to the clay contained in the aggregate. The clay in the aggregate will weaken the water-reducing and dispersing properties of PCE, affect the workability of fresh concrete, and seriously reduce the strength and durability of hardened concrete. In response to the above problems, domestic and foreign methods mainly solve them by optimizing molecular structure, introducing functional groups, and compounding sacrificial agents. However, there are still problems such as complex process, low cost performance, expensive functional monomers, and high cost of sacrificial agents and high competition with PCE. Therefore, developing an anti-mud water reducer with simple process, cost saving, and practical engineering application is the direction of technological development. Summary of the invention

[0003] The main purpose of the present invention is to provide a phosphating monomer and a preparation method to overcome the deficiencies in the prior art.

[0004] Another object of the present invention is to provide application of the phosphated monomer.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes:

[0006] The embodiment of the present invention provides a phosphating monomer having a structure as shown in formula (I):

[0007]

[0008] Wherein, R1 and R2 are independently selected from at least one of the following groups:

[0009]

[0010] The embodiment of the present invention further provides a phosphating monomer, which is prepared from hydroxy acrylate, a dispersing solvent, phosphorus pentoxide and a polymerization inhibitor.

[0011] The embodiment of the present invention further provides a method for preparing a phosphating monomer, which comprises: reacting hydroxy acrylate, a dispersing solvent, phosphorus pentoxide and a polymerization inhibitor to obtain a phosphating monomer.

[0012] In some embodiments, the hydroxy acrylate includes at least any one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, 3-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate.

[0013] The embodiment of the present invention also provides the use of the above-mentioned phosphating monomer in the preparation of polycarboxylic acid-based water reducer.

[0014] Correspondingly, an embodiment of the present invention further provides a method for preparing a polycarboxylic acid-based water reducer, which comprises: reacting a phosphating monomer with acrylic acid, vinyl polyethylene glycol ether, hydrogen peroxide, sodium hypophosphite, E51 and water to obtain a polycarboxylic acid-based water reducer.

[0015] The embodiment of the present invention also provides a polycarboxylic acid water reducing agent prepared by the above preparation method.

[0016] Compared with the prior art, the beneficial effects of the present invention are at least:

[0017] 1) The phosphorus monomer provided by the present invention is prepared from phosphorus pentoxide, a dispersing solvent, hydroxy acrylate and a polymerization inhibitor at normal pressure and low temperature. The hydroxy acrylate contains an ester group and a trace of water. The phosphorus pentoxide can react with water to generate phosphoric acid. The generated phosphoric acid can further undergo an esterification reaction with the ester group to produce phosphoric acid and water. This part of water can continue to react with phosphorus pentoxide to produce phosphoric acid, thereby promoting the formation of phosphoric acid. At the same time, the preparation process is simple and can be prepared using conventional water reducer production equipment without the need to purchase other equipment, greatly reducing equipment consumption, and has low energy consumption and good economy;

[0018] 2) The polycarboxylic acid water reducer prepared by the present invention has a carboxyl group, an ester group, a phosphate group, and a long molecular side chain; the carboxyl group, the long molecular side chain, and the ester group have good dispersibility, the ester group has good collapse resistance, and the phosphate group has good anti-mud performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0020] Figure 1 This is the infrared spectrum of the phosphated monomer obtained in Example 1 of the present invention;

[0021] Figure 2 This is the NMR spectrum of the phosphated monomer obtained in Example 1 of the present invention. DETAILED DESCRIPTION

[0022] In view of the above problems existing in the prior art, after long-term research and a large number of experiments, the inventors of this case proposed a method for preparing a phosphating monomer and the application of the phosphating monomer.

[0023] For ease of understanding of the present invention, the present invention will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. On the contrary, the purpose of providing these embodiments or examples is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0024] As one aspect of the technical solution of the present invention, a phosphating monomer involved therein has a structure as shown in formula (I):

[0025]

[0026] In formula (I), R1 is at least one selected from the following groups:

[0027]

[0028] R2 is at least one selected from the following groups:

[0029]

[0030] As another aspect of the technical solution of the present invention, a phosphating monomer involved therein is prepared from hydroxy acrylate, a dispersing solvent, phosphorus pentoxide and an inhibitor.

[0031] In some embodiments, the hydroxy acrylate may include at least any one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, etc., but is not limited thereto.

[0032] In some embodiments, the dispersing solvent may include at least any one of diethyl ether, 1,2-dichloromethane, 1,2-dichloroethane, acetonitrile, N,N-dimethylformamide, etc., preferably at least any one of 1,2-dichloromethane, 1,2-dichloroethane, acetonitrile, etc., but is not limited thereto.

[0033] In some embodiments, the polymerization inhibitor may include at least any one of hydroquinone, phenothiazine, p-hydroxyanisole, p-tert-butylcatechol, etc. The polymerization inhibitor is added to the reaction to prevent the self-polymerization of hydroxy acrylate.

[0034] Furthermore, the polymerization inhibitor is preferably hydroquinone and / or phenothiazine, etc. Hydroquinone and phenothiazine have better polymerization inhibition effect and are not easy to discolor.

[0035] In some embodiments, the mass ratio of the hydroxy acrylate, the dispersing solvent, the phosphorus pentoxide and the polymerization inhibitor is 100: (30-60): (30-60): (0.01-0.05).

[0036] In some more specific embodiments, the phosphating monomer is prepared from hydroxy acrylate, dispersing solvent, phosphorus pentoxide and inhibitor at room temperature and pressure, and the weight ratio of hydroxy acrylate, dispersing solvent, phosphorus pentoxide and inhibitor is 100: (40-50) (40-50): (0.02-0.04).

[0037] In some embodiments, the number average molecular weight of the phosphated monomer is 196-350, the phosphate diester rate is 50-80%, the phosphate monoester rate is 17-49%, the phosphoric acid rate is 1-3%, and the pH value of a 1wt% aqueous solution of the phosphated monomer is 1.1-2.3.

[0038] As another aspect of the technical solution of the present invention, a method for preparing a phosphating monomer involves: reacting hydroxy acrylate, a dispersing solvent, phosphorus pentoxide and a polymerization inhibitor to obtain a phosphating monomer.

[0039] In some embodiments, the method for preparing the phosphated monomer comprises:

[0040] Under normal pressure, phosphorus pentoxide, a polymerization inhibitor and a dispersing solvent are mixed and the temperature is lowered to react to obtain a reaction system;

[0041] Adding hydroxy acrylate into the reaction system, reacting and aging, to obtain the phosphating monomer.

[0042] In some more preferred embodiments, the method for preparing the phosphated monomer comprises the following steps:

[0043] (1) Under normal pressure, 30 to 60 parts of phosphorus pentoxide, 0.01 to 0.05 parts of a polymerization inhibitor, and 30 to 60 parts of a dispersing solvent are mixed and reacted at a reduced temperature to obtain a reaction system (also referred to as a reaction base material A);

[0044] (2) Add 100 parts of hydroxy acrylate to the reaction base material A obtained in step (1), and after the addition is completed, mature at a constant temperature to react and obtain the phosphating monomer.

[0045] Furthermore, step (1) in the preparation method comprises: adding the phosphorus pentoxide into the reaction base material A in batches to carry out the reaction.

[0046] Furthermore, the cooling reaction in step (1) of the preparation method specifically comprises: reacting at a temperature of 5 to 35° C. for 10 to 30 minutes.

[0047] Furthermore, step (2) in the preparation method comprises: adding the hydroxy acrylate in a dropwise manner for 1 to 4 hours.

[0048] Furthermore, the reaction temperature during the dropwise addition in step (2) does not exceed 90°C.

[0049] Furthermore, in step (2), the aging temperature is maintained at 30 to 80° C., and the aging time is 30 to 90 minutes.

[0050] Furthermore, the types and proportions of the hydroxy acrylate, the dispersing solvent and the polymerization inhibitor are as described above and will not be described in detail here.

[0051] In summary, the phosphated monomer provided by the present invention is prepared from phosphorus pentoxide, a dispersing solvent, hydroxy acrylate and a polymerization inhibitor at normal pressure and temperature, has a simple preparation process, can be produced by conventional water reducer production equipment, does not require the purchase of other equipment, has low energy consumption, and has good economy.

[0052] As one aspect of the technical solution of the present invention, it also relates to the use of the aforementioned phosphating monomer in the preparation of a polycarboxylic acid-based water reducer.

[0053] Correspondingly, another aspect of the technical solution of the present invention also relates to a method for preparing a polycarboxylic acid-based water reducer, which comprises: reacting the aforementioned phosphated monomer with vinyl polyethylene glycol ether, acrylic acid, hydrogen peroxide, sodium hypophosphite, E51 and water to obtain a polycarboxylic acid-based water reducer.

[0054] In some embodiments, the raw materials of the polycarboxylic acid water reducer include phosphated monomer, vinyl polyethylene glycol ether, acrylic acid, hydrogen peroxide, sodium hypophosphite, E51 and water. Among them, sodium hypophosphite is used as a chain transfer agent to control the molecular weight of the polymer, and E51 is a reducing agent, which forms a redox initiation system with hydrogen peroxide to promote the polymerization of the phosphated monomer and the vinyl polyethylene glycol ether.

[0055] In some embodiments, the mass ratio of the vinyl polyethylene glycol ether, acrylic acid, phosphating monomer, hydrogen peroxide, sodium hypophosphite, E51 and water is 100: (5-10): (3-5): (5-10): (3-5): (0.2-0.4): (110-120).

[0056] In some embodiments, the preparation method comprises:

[0057] The vinyl polyethylene glycol ether, sodium hypophosphite, hydrogen peroxide and part of water are uniformly mixed and the temperature is controlled at 10 to 30° C. to form a first material;

[0058] Mixing the phosphating monomer and acrylic acid to form a second material;

[0059] Mixing the E51 with the remaining amount of water to form a third material;

[0060] The second material and the third material are respectively added dropwise to the first material for reaction, during which the temperature is controlled not to exceed 50° C. The dropping time is 30 to 90 minutes, and then ripened at 30 to 50° C. for 60 to 120 minutes to obtain a polycarboxylic acid-based water reducer.

[0061] Furthermore, the preparation method comprises: uniformly mixing 100 parts of vinyl polyethylene glycol ether, 3 to 5 parts of sodium hypophosphite, 5 to 10 parts of hydrogen peroxide and 100 parts of water, and controlling the temperature at 10 to 30° C. to form a first material.

[0062] Furthermore, the preparation method comprises: mixing 3 to 5 parts of phosphating monomers with 5 to 10 parts of acrylic acid to form a second material.

[0063] Furthermore, the preparation method comprises: mixing 0.2 to 0.4 parts of E51 with 10 to 20 parts of water to form a third material.

[0064] In some more specific preferred embodiments, the preparation method of the polycarboxylic acid water reducer comprises the following steps: 100 parts of vinyl polyethylene glycol ether, 3-5 parts of sodium hypophosphite, 5-10 parts of hydrogen peroxide and 100 parts of water are mixed evenly in a reaction kettle, and the temperature is controlled at 10-30°C to form a first material. 3-5 parts of phosphating monomers are mixed with 5-10 parts of acrylic acid to form a second material. 0.2-0.4 parts of E51 are mixed with 10-20 parts of water to form a third material. The second material and the third material are respectively added dropwise to the first material, and the temperature is kept at no more than 50°C during the period. The second material and the third material are added dropwise for 30-90 minutes. Stirring is continued during the reaction. After the addition is completed, the mixture is kept warm and matured at 30-50°C for 60-120 minutes to obtain a polycarboxylic acid water reducer.

[0065] As one aspect of the technical solution of the present invention, it relates to a polycarboxylic acid-based water reducer prepared by the above-mentioned preparation method.

[0066] In summary, the polycarboxylic acid water reducer synthesized in the present invention has good dispersibility and anti-mud performance. Since the phosphoric acid group has a higher electronegativity than the carboxylic acid group, it has a stronger adsorption capacity for the cement particle surface, so the water reducer is more easily adsorbed on the cement particle surface, thereby exerting a dispersing effect. In addition, in addition to the phosphoric acid group with strong adsorption capacity, the carboxylic acid group also provides a better water reduction effect.

[0067] Different from other methods of improving the anti-mud ability of polycarboxylic acid water reducers prepared by cross-linking reactions, the present invention synthesizes new monomers for synthesizing polycarboxylic acid water reducers, which contain carboxyl groups, ester groups, phosphate groups, and long molecular side chains, so that the polycarboxylic acid water reducer has better dispersibility and anti-mud performance.

[0068] The technical solution of the present invention is described in detail below in conjunction with specific embodiments so that those skilled in the art can better understand and implement the technical solution of the present invention. The specific functional details disclosed herein should not be interpreted as limiting, but only as the basis for the claims and as a representative basis for teaching those skilled in the art to adopt the present invention in different ways in any appropriate detailed embodiment.

[0069] Unless otherwise specified, the raw materials and reagents of the materials of the present invention are all commercially available. The cement used to prepare the concrete in Table 2 below was purchased from Ningbo Conch Co., Ltd., fly ash and mineral powder were purchased from Ningbo Yinzhou Tuotou Fly Ash Co., Ltd., machine-made sand and gravel were purchased from Ningbo Yinzhou Nanyang Machine-made Sand Co., Ltd., and the commercially available anti-mud polycarboxylic acid water reducer was purchased from China Building Material Zhongyan Technology Co., Ltd.

[0070] Example 1

[0071] The preparation method of a phosphating monomer in this embodiment is as follows:

[0072] Weigh 50 parts of 1,2-dichloromethane and place it in a reaction kettle, then add 50 parts of phosphorus pentoxide and 0.05 parts of inhibitor hydroquinone, start stirring, reduce the temperature to 5°C for 10 minutes to react, and stir to obtain a mixed solution; weigh 100 parts of hydroxyethyl acrylate and uniformly add it dropwise to the above mixed solution within 1 hour, maintain stirring, and control the temperature not to exceed 90°C during the reaction; after the addition is completed, keep the temperature at 80°C for 40 minutes to obtain a phosphated monomer.

[0073] After testing, the infrared spectrum of the phosphating monomer is as follows Figure 1 As shown, it can be seen that 808.14cm -1 The stretching vibration peak of PO is at 1120-940cm -1 There will be a broad band at Figure 1 There is a broad band at 1089.14-969.35, and both C=O and P=O have strong absorption peaks at 1722.36. Combined with the above, it can be proved that phosphate exists in the product.

[0074] The NMR spectrum of the phosphorylated monomer is as follows Figure 2As shown, it can be seen that around 2.5ppm is the chemical shift of hydrogen on -CH2-O-, 4.0-4.5ppm is the chemical shift of hydrogen on P-OH, and 5.8-6.5PPm may be the chemical shift of three hydrogens on CH2=CH-R.

[0075] In this embodiment, the above-mentioned phosphating monomer is used to prepare a polycarboxylic acid-based water reducer, and the first material, the second material and the third material are respectively prepared according to the ratios shown in Table 1.

[0076] Table 1 Component ratios of the first material, the second material and the third material required for the preparation of the water reducing agent

[0077]

[0078] 100 kg of deionized water, 100 kg of vinyl polyethylene glycol ether, and 5 kg of sodium hypophosphite are sequentially added into a reactor, stirring is started, and the reaction temperature is controlled at 10° C. After stirring until the vinyl polyethylene glycol ether and the sodium hypophosphite are completely dissolved, 8% hydrogen peroxide is added to obtain a first material;

[0079] The pre-prepared second material and third material are added dropwise into the first material, wherein the second material and the third material are added dropwise at a uniform speed within 60 minutes, and the reaction temperature is kept not higher than 50°C. After the two materials are added dropwise, the temperature is kept at 50°C for 60 minutes to obtain a polycarboxylic acid water reducer.

[0080] The prepared polycarboxylic acid water reducer was applied to C30 concrete with a machine-made sand mud content of 5%. The concrete mix is ​​shown in Table 2.

[0081] Table 2 Concrete mix ratio

[0082] Material cement Fly ash Mineral powder Machine-made sand Stone Water reducing agent water Dosage / Kg 280 40 40 770 1045 2.0 160

[0083] The concrete was tested with reference to GB 8076-2008 "Concrete Admixtures". After testing, when 2.0 kg of the polycarboxylic acid water reducer prepared by the present invention and synthesized based on the phosphated small monomer containing unsaturated double bonds was added to C30 concrete with a mud content of 5%, the initial expansion of the concrete was 550 mm and the expansion after 60 minutes was 500 mm.

[0084] Embodiment 2-6

[0085] The difference between Examples 2 to 6 and Example 1 is that, during the preparation of the phosphating monomer, Examples 2 to 6 are as shown in Table 3:

[0086] Table 3 Example 2N6 phosphating monomer preparation raw materials and parameters

[0087] Raw materials, operating parameters Example 2 Example 3 Example 4 Example 5 Example 6 Hydroxyethyl acrylate 100 0 0 0 50 Hydroxypropyl acrylate 0 100 0 0 0 Hydroxybutyl acrylate 0 0 100 0 0 3-Hydroxypropyl acrylate 0 0 0 100 0 4-Hydroxybutyl acrylate 0 0 0 0 50 1-2 dichloromethane 50 0 0 30 10 1-2-Dichloroethane 0 50 0 30 10 Acetonitrile 0 0 40 0 10 Phosphorus pentoxide 50 55 60 40 30 Hydroquinone 0.05 0 0.01 0.02 0.04 Phenothiazines 0 0.01 0.02 0 0 Cooling temperature / ℃ 5 10 20 30 35 Cooling time / min 30 25 20 15 10 Hydroxyl acrylate drop time / h 1 2 2.5 3 4 Maximum reaction temperature / ℃ 50 60 70 80 90 Curing temperature / ℃ 30 50 60 70 80 Ripening time / min 40 90 80 60 30

[0088] The concentrations of monoesters and diesters of the phosphating monomers prepared in Examples 1 to 5 and the pH values ​​of 1 wt % aqueous solutions are shown in Table 4:

[0089] Table 4 Various indicators of phosphating monomers

[0090]

[0091] The phosphating monomers obtained in the above Examples 2 to 6 were used to prepare polycarboxylic acid water reducers according to the proportions and synthesis processes shown in Table 1 of Example 1, and the obtained polycarboxylic acid water reducers were applied to C30 concrete with a mud content of 5% according to the proportions shown in Table 2.

[0092] Comparative Example 1

[0093] The difference between this comparative example and Example 1 is that in the preparation process of the water reducer, all the phosphating monomers are replaced by acrylic acid, and the rest is prepared according to Table 1 and the process shown in Example 1 to prepare a polycarboxylic acid water reducer, and the obtained polycarboxylic acid water reducer is applied to C30 concrete with a mud content of 5% according to the ratio shown in Table 2, and the concrete performance is tested. The results are shown in Table 5.

[0094] Comparative Example 2

[0095] The difference between this comparative example and Example 1 is that in the preparation process of the water reducer, the phosphating monomer is replaced with 2-hydroxyethyl methacrylate phosphate sold on the market, and the rest is prepared according to Table 1 and the process shown in Example 1 to prepare a polycarboxylic acid water reducer, and the obtained polycarboxylic acid water reducer is applied to C30 concrete with a mud content of 5% according to the ratio shown in Table 2, and the concrete performance is tested. The results are shown in Table 5.

[0096] Comparative Example 3

[0097] The difference between this comparative example and Example 1 is that the prepared polycarboxylic acid water reducer is replaced by a commercially available anti-mud polycarboxylic acid water reducer, and the obtained polycarboxylic acid water reducer is applied to C30 concrete with a mud content of 5% according to the ratio shown in Table 2, and the concrete properties are tested. The results are shown in Table 5.

[0098] Table 5 Concrete properties

[0099]

[0100]

[0101] It can be seen from Table 5 that the polycarboxylic acid water reducer synthesized based on the phosphating monomer of the present invention has an initial expansion of 550-610 mm and a 60-minute expansion of 510-560 mm in C30 concrete with a mud content of 5%, which is better than the commercially available polycarboxylic acid water reducer.

[0102] The various aspects, embodiments, features and examples of the present invention should be considered as illustrative in all aspects and are not intended to limit the present invention, the scope of the present invention is defined only by the claims. Other embodiments, modifications and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

[0103] In addition, the inventors of this case also referred to the aforementioned embodiments and conducted experiments with other raw materials, process operations, and process conditions described in this specification, and obtained relatively ideal results.

[0104] Although the present invention has been described with reference to illustrative embodiments, it will be appreciated by those skilled in the art that various other changes, omissions and / or additions may be made without departing from the spirit and scope of the present invention and that the elements of the embodiments may be replaced by substantial equivalents. In addition, many modifications may be made without departing from the scope of the present invention to adapt specific circumstances or materials to the teachings of the present invention. Therefore, it is not intended herein to limit the present invention to the disclosed specific embodiments for performing the present invention, but it is intended that the present invention will include all embodiments within the scope of the appended claims. In addition, unless specifically stated, any use of the terms first, second, etc. does not indicate any order or importance, but rather uses the terms first, second, etc. to distinguish one element from another.

Claims

1. A phosphating monomer, characterized in that: The phosphorized monomer has a structure as shown in formula (I): Wherein, R1 and R2 are independently selected from at least one of the following groups:

2. A phosphating monomer, characterized in that: The phosphating monomer is prepared from hydroxy acrylate, a dispersing solvent, phosphorus pentoxide and a polymerization inhibitor.

3. The phosphating monomer according to claim 2, characterized in that: The hydroxy acrylate includes at least any one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, 3-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate; and / or, the dispersing solvent includes at least any one of diethyl ether, 1,2-dichloromethane, 1,2-dichloroethane, acetonitrile, and N,N-dimethylformamide, preferably at least any one of 1,2-dichloromethane, 1,2-dichloroethane, and acetonitrile; and / or, the polymerization inhibitor comprises at least any one of hydroquinone, phenothiazine, p-hydroxyanisole, and p-tert-butylcatechol, preferably hydroquinone and / or phenothiazine; And / or, the mass ratio of the hydroxy acrylate, the dispersing solvent, phosphorus pentoxide and the polymerization inhibitor is 100:(30-60):(30-60):(0.01-0.05), preferably 100:(40-50)(40-50):(0.02-0.04); And / or, the number average molecular weight of the phosphating monomer is 196-350, the phosphoric acid diester rate is 50-80%, the phosphoric acid monoester rate is 17-49%, the phosphoric acid rate is 1-3%, and the pH value of 1wt% aqueous solution is 1.1-2.

3.

4. A method for preparing a phosphated monomer, characterized in that: include: Hydroxyl acrylate, a dispersing solvent, phosphorus pentoxide and a polymerization inhibitor are reacted to obtain a phosphating monomer.

5. The preparation method according to claim 4, characterized in that: include: Under normal pressure, phosphorus pentoxide, a polymerization inhibitor and a dispersing solvent are mixed and the temperature is lowered to react to obtain a reaction system; Adding hydroxy acrylate to the reaction system, reacting, and aging to obtain the phosphating monomer; Preferably, the preparation method comprises: adding the phosphorus pentoxide in batches; Preferably, the cooling reaction comprises: reacting at a temperature of 5 to 35° C. for 10 to 30 minutes; Preferably, the preparation method comprises: adding the hydroxy acrylate in a dropwise manner for 1 to 4 hours, and controlling the reaction temperature below 90° C.; Preferably, the aging temperature is 30-80° C., and the aging time is 30-90 min.

6. The preparation method according to claim 5, characterized in that: The mass ratio of the hydroxy acrylate, the dispersing solvent, phosphorus pentoxide and the polymerization inhibitor is 100: (30-60): (30-60): (0.01-0.05), preferably 100: (40-50) (40-50): (0.02-0.04); and / or, the hydroxy acrylate includes at least any one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, 3-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate; and / or, the dispersing solvent includes at least any one of diethyl ether, 1,2-dichloromethane, 1,2-dichloroethane, acetonitrile, and N,N-dimethylformamide, preferably at least any one of 1,2-dichloromethane, 1,2-dichloroethane, and acetonitrile; And / or, the polymerization inhibitor includes at least any one of hydroquinone, phenothiazine, p-hydroxyanisole, and p-tert-butylcatechol, preferably hydroquinone and / or phenothiazine.

7. Use of the phosphated monomer according to any one of claims 1 to 3 in the preparation of a polycarboxylic acid-based water reducer.

8. A method for preparing a polycarboxylic acid water reducing agent, characterized in that: include: The phosphating monomer described in any one of claims 1 to 3 is reacted with acrylic acid, vinyl polyethylene glycol ether, hydrogen peroxide, sodium hypophosphite, E51 and water to prepare a polycarboxylic acid-based water reducer.

9. The preparation method according to claim 8, characterized in that: The mass ratio of the vinyl polyethylene glycol ether, acrylic acid, phosphating monomer, hydrogen peroxide, sodium hypophosphite, E51 and water is 100: (5-10): (3-5): (5-10): (3-5): (0.2-0.4): (110-120); And / or, the preparation method comprises: The vinyl polyethylene glycol ether, sodium hypophosphite, hydrogen peroxide and part of water are uniformly mixed and the temperature is controlled at 10 to 30° C. to form a first material; Mixing the phosphating monomer and acrylic acid to form a second material; Mixing the E51 with the remaining amount of water to form a third material; The second material and the third material are respectively added dropwise to the first material for reaction, during which the temperature is controlled not to exceed 50° C., the dropping time is 30 to 90 minutes, and then ripened at 30 to 50° C. for 60 to 120 minutes to obtain a polycarboxylic acid-based water reducer; Preferably, the preparation method comprises: uniformly mixing 100 parts of vinyl polyethylene glycol ether, 3 to 5 parts of sodium hypophosphite, 5 to 10 parts of hydrogen peroxide and 100 parts of water, and controlling the temperature at 10 to 30° C. to form a first material; Preferably, the preparation method comprises: mixing 3 to 5 parts of phosphating monomers with 5 to 10 parts of acrylic acid to form a second material; Preferably, the preparation method comprises: mixing 0.2 to 0.4 parts of E51 with 10 to 20 parts of water to form a third material.

10. A polycarboxylic acid water reducing agent prepared by the preparation method according to any one of claims 8 to 9.

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