阅读说明：本技术 一种聚膦酸酯侧链的聚羧酸减水剂及其制备方法 (Polycarboxylate superplasticizer with polyphosphonate side chains and preparation method thereof ) 是由 王学川 钱珊珊 卢通 赵旭 彭荩影 屈浩杰 于鹏程 郑春扬 于 2021-01-21 设计创作，主要内容包括：本发明公开了一种聚膦酸酯侧链的聚羧酸减水剂及其制备方法,聚膦酸酯侧链的聚羧酸减水剂为梳形结构,侧链由聚乙二醇-聚膦酸酯单甲醚组成,其数均分子量为10000～100000,制备方法为先将2-氯-2-氧-1,3,2-二氧磷杂环戊烷和一元醇在催化剂作用下制备出中间体P,随后将制得中间体P与聚乙二醇单甲醚进行开环聚合,制得聚乙二醇-聚膦酸酯单甲醚线性大分子E,最后将线性大分子E与聚丙烯酸S进行酯化接枝反应,制备聚膦酸酯侧链的聚羧酸减水剂。本发明制备的聚膦酸酯侧链聚羧酸减水剂侧链具有双亲特性,提供更强的空间位阻效应,从而获得较传统聚羧酸减水剂更强的分散能力；侧链能从根本上抑制侧链在泥土中的插层,具有优异的抗泥保塑特性。(The invention discloses a polycarboxylate water reducer with polyphosphonate side chains and a preparation method thereof, wherein the polycarboxylate water reducer with the polyphosphonate side chains is of a comb-shaped structure, the side chains are composed of polyethylene glycol-polyphosphonate monomethyl ether, the number average molecular weight of the polycarboxylate water reducer is 10000-100000, the preparation method comprises the steps of firstly preparing an intermediate P from 2-chloro-2-oxo-1, 3, 2-dioxaphospholane and monohydric alcohol under the action of a catalyst, then carrying out ring-opening polymerization on the prepared intermediate P and the polyethylene glycol monomethyl ether to prepare polyethylene glycol-polyphosphonate monomethyl ether linear macromolecules E, and finally carrying out esterification grafting reaction on the linear macromolecules E and polyacrylic acid S to prepare the polycarboxylate water reducer with the polyphosphonate side chains. The polyphosphonate side chain polycarboxylate superplasticizer prepared by the method has an amphiphilic characteristic and provides a stronger steric hindrance effect, so that the polycarboxylate superplasticizer has stronger dispersing capacity than the traditional polycarboxylate superplasticizer; the side chain can fundamentally inhibit the intercalation of the side chain in the soil and has excellent mud resistance and plastic protection properties.)

1. A polycarboxylate water reducing agent with polyphosphonate side chains is characterized in that: the polycarboxylate superplasticizer with polyphosphonate side chains is of a comb-shaped structure, the side chains are composed of polyethylene glycol-polyphosphonate monomethyl ether, and the molecular formula of the polycarboxylate superplasticizer is as shown in formula (I):

（Ⅰ）

in the formula (I), a, b, n and m are integers which are not 0, a is an integer between 30 and 100, a: b = 1-10, n = 4-40, and m = 4-113; r is alkyl part of monohydric alcohol, namely one of methyl, ethyl, propyl, isopropanol, n-butyl and isobutyl.

2. The polycarboxylate superplasticizer with polyphosphonate side chains as claimed in claim 1, wherein: the number average molecular weight of the polycarboxylate superplasticizer with the polyphosphonate side chain is 10000-150000.

3. A preparation method of a polycarboxylate water reducer with polyphosphonate side chains is used for preparing the polycarboxylate water reducer with polyphosphonate side chains as claimed in any one of claims 1 to 2, and is characterized in that: the method comprises the following steps:

the method comprises the following steps: 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, monohydric alcohol, solvent A1 and catalyst B1 are placed in a reactor, and N is adopted₂Replacement ofStirring the gas in the reactor, reacting for 4-7 h at normal temperature, and distilling to remove the solvent to obtain a product, namely a reaction intermediate P; the structural formula of the reaction intermediate P is shown as the formula (II):

（Ⅱ）

in the formula (II), R is an alkyl part of monohydric alcohol, namely one of methyl, ethyl, propyl, isopropanol, n-butyl and isobutyl;

step two: placing the reaction intermediate P, the polyethylene glycol monomethyl ether, the solvent A2 and the catalyst B2 generated in the step one into a reactor, replacing gas in the reactor by N2, starting stirring, controlling the temperature to be 0-20 ℃, and carrying out ring-opening polymerization reaction to obtain polyethylene glycol-polyphosphonate monomethyl ether linear macromolecules E; the structural formula of the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E is shown as the formula (III):

（Ⅲ）

(III) n and m are integers, n = 4-40, and m = 4-11;

step three: placing the polyethylene glycol-polyphosphonate monomethyl ether E and the polyacrylic acid S prepared in the second step into a single-neck flask with a stirring device, adding the catalyst B3, and introducing N₂Carrying out esterification grafting at 100-200 ℃ with water, reacting for 4-6 h, and cooling to room temperature to obtain a faint yellow solid, namely the polycarboxylate superplasticizer with polyphosphonate side chains;

the steps are as follows: the solvent A1 is one of tetrahydrofuran, benzene, toluene and xylene; the catalyst B1 is one of triethanolamine and diethanolamine; the solvent A2 is one of carbon tetrachloride, dichloromethane and dimethyl sulfoxide; catalyst B2 is 1, 8-diazabicyclo [5.4.0]One of undec-7-ene, stannous isooctanoate and aluminum isopropoxide; catalyst B3 was concentrated H₂SO₄85 wt% of phosphonic acid, p-toluenesulfonic acid, p-4-hydroxybenzene sulfonic acid and 4-dimethylaminopyridine or a compound of more than one of the phosphonic acid, the p-toluenesulfonic acid, the p-4-hydroxybenzene sulfonic acid and the 4-dimethylaminopyridine in any proportion.

4. The preparation method of the polycarboxylate superplasticizer with the polyphosphonate side chain according to claim 3, which is characterized by comprising the following steps: the solvent A1 is tetrahydrofuran.

5. The preparation method of the polycarboxylate superplasticizer with the polyphosphonate side chain according to claim 3, which is characterized by comprising the following steps: the solvent A2 is dichloromethane.

6. The preparation method of the polycarboxylate superplasticizer with the polyphosphonate side chain according to claim 3, which is characterized by comprising the following steps: the catalyst B2 is 1, 8-diazabicyclo [5.4.0] undec-7-ene.

7. The preparation method of the polycarboxylate superplasticizer with the polyphosphonate side chain according to claim 3, which is characterized by comprising the following steps: the polyacrylic acid S is a linear polymer obtained by acrylic acid monomers through free radical reaction, and the number average molecular weight of the polyacrylic acid S is 2000-10000.

Technical Field

The invention relates to the technical field of building materials, in particular to a polycarboxylate superplasticizer with polyphosphonate side chains and a preparation method thereof.

Background

The polycarboxylate superplasticizer is a concrete mixture dispersing agent, and has the main function of reducing the water consumption of single-side concrete and simultaneously enabling the concrete mixture to have good plasticizing performance. Although the mud in the qualified range has little influence on the strength and durability of the hardened concrete, the polyethylene glycol side chain of the polycarboxylic acid water reducer is easy to be intercalated and adsorbed in the mud, so that the utilization efficiency of the water reducer is greatly reduced, and the plasticizing performance loss of a concrete mixture is aggravated, thereby bringing troubles to the cast-in-place.

In order to fully exert the performance of the polycarboxylate superplasticizer, improve the dispersing capacity of the polycarboxylate superplasticizer and solve the trouble brought to concrete by soil. The prior art Chinese patent publication numbers are: CN111848880A, patent name: compared with the traditional anionic polycarboxylate superplasticizer, the application introduces cationic groups into the molecular structure, improves the initial adsorption capacity of the polycarboxylate superplasticizer and reduces the sensitivity of the superplasticizer to soil. The prior art Chinese patent publication numbers are: CN107721233B, patent name: the raw materials of the polycarboxylate superplasticizer comprise maleic acid, triethanolamine, polyoxyethylene monomethyl ether, acrylamide, acrylic acid, isoamyl polyoxyethylene ether, a maleic acid grafted glucose phosphonate derivative and water. The prior art Chinese patent publication numbers are: the patent name of CN111777722A is: a mud-resistant slump-retaining type polycarboxylate water reducer discloses a mud-resistant slump-retaining type polycarboxylate water reducer, which is prepared by carrying out esterification reaction on maleic anhydride and 2-hydroxyphosphonoacetic acid under the conditions of heating and stirring to obtain a mud-resistant functional monomer; then hydrophobic polyether macromonomer, acrylic acid and methyl methacrylate monomer are introduced to carry out free radical polymerization to obtain the product. The mud-resistant and slump-retaining polycarboxylate superplasticizer can effectively ensure the mud-resistant and slump-retaining performance of the obtained fresh concrete. The prior art Chinese patent publication numbers are: CN109053972B, invention name: the invention discloses a preparation method of a blocking intercalation anti-mud type polycarboxylate superplasticizer, and discloses a preparation method of a blocking intercalation anti-mud type polycarboxylate superplasticizer.

The above prior arts all have been dedicated to research on introducing functional monomers into the main chain of polycarboxylic acid to adjust the adsorption characteristics of the main chain of polycarboxylic acid, thereby improving the effective utilization rate thereof.

Disclosure of Invention

1. The technical problem to be solved is as follows:

aiming at the technical problems, the invention provides a polycarboxylate water reducer with polyphosphonate side chains and a preparation method thereof, the method mainly focuses on polyethylene glycol side chains of the polycarboxylate water reducer, and the polyethylene glycol-polyphosphonate block polymer with amphiphilicity is synthesized through ring-opening polymerization of 2-alkoxy-2-oxygen-1, 3, 2-dioxaphospholane and polyethylene glycol monomethyl ether, and is grafted to a polycarboxylate main chain through esterification reaction to prepare the polycarboxylate water reducer with polyphosphonate side chains. On one hand, the side chain of the polycarboxylate superplasticizer with the polyphosphonate side chain prepared by the method has an amphiphilic characteristic and provides a stronger steric hindrance effect, so that the polycarboxylate superplasticizer has stronger dispersing capacity than the traditional polycarboxylate superplasticizer; on the other hand, the side chain of the polycarboxylate superplasticizer with the polyphosphonate side chain can fundamentally inhibit the intercalation of the side chain in soil, and has excellent mud resistance and plasticity preservation properties.

2. The technical scheme is as follows:

a polycarboxylate water reducing agent with polyphosphonate side chains is characterized in that: the polycarboxylate superplasticizer with polyphosphonate side chains is of a comb-shaped structure, the side chains are composed of polyethylene glycol-polyphosphonate monomethyl ether, and the molecular formula of the polycarboxylate superplasticizer is as shown in formula (I):

（Ⅰ）

in the formula (I), a and b are integers different from 0, a is an integer between 30 and 100, a: b =1 ~ 10.

Further, the number average molecular weight of the polycarboxylate superplasticizer with the polyphosphonate side chain is 10000-150000.

A preparation method of a polycarboxylate water reducer with polyphosphonate side chains is used for preparing the polycarboxylate water reducer with polyphosphonate side chains as claimed in any one of claims 1 to 2, and is characterized in that: the method comprises the following steps:

the method comprises the following steps: placing 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, monohydric alcohol, a solvent A1 and a catalyst B1 in a reactor, replacing gas in the reactor with N2, starting stirring, reacting at normal temperature for 4-7 hours, and distilling to remove the solvent to obtain a product, namely a reaction intermediate P; the structural formula of the reaction intermediate P is shown as the formula (II):

（Ⅱ）

in the formula (II), R is alkyl part of monohydric alcohol, namely one of methyl, ethyl, propyl, isopropanol, n-butyl and isobutyl.

Step two: placing the reaction intermediate P, the polyethylene glycol monomethyl ether, the solvent A2 and the catalyst B2 generated in the step one into a reactor, replacing gas in the reactor by N2, starting stirring, controlling the temperature to be 0-20 ℃, and carrying out ring-opening polymerization reaction to obtain polyethylene glycol-polyphosphonate monomethyl ether linear macromolecules E; the structural formula of the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E is shown as the formula (III):

（Ⅲ）

in the formula (III), n and m are integers, n = 4-40, and m = 4-11.

Step three: and (3) placing the polyethylene glycol-polyphosphonate monomethyl ether E and the polyacrylic acid S prepared in the step two into a single-neck flask with a stirring device, adding a catalyst B3, introducing N2 with water, carrying out esterification grafting at 100-200 ℃, reacting for 4-6 h, and cooling to room temperature to obtain a light yellow solid, namely the polycarboxylate superplasticizer with polyphosphonate side chains.

The steps are as follows: the solvent A1 is one of tetrahydrofuran, benzene, toluene and xylene; the catalyst B1 is one of triethanolamine and diethanolamine; the solvent A2 is one of carbon tetrachloride, dichloromethane and dimethyl sulfoxide; the catalyst B2 is one of 1, 8-diazabicyclo [5.4.0] undec-7-ene, stannous isooctanoate and aluminum isopropoxide; the catalyst B3 is one or more of concentrated H2SO4, 85 wt% phosphonic acid, p-toluenesulfonic acid, p-4-hydroxybenzenesulfonic acid and 4-dimethylaminopyridine in any proportion.

Further, the solvent a1 is tetrahydrofuran.

Further, the solvent a2 is dichloromethane.

Further, the catalyst B2 is 1, 8-diazabicyclo [5.4.0] undec-7-ene.

Further, the polyacrylic acid S is a linear polymer obtained by acrylic acid monomers through free radical reaction, and the number average molecular weight of the polyacrylic acid S is 2000-10000.

3. Has the advantages that:

(1) according to the invention, by adopting a polyphosphonate/polyethylene glycol block method, an amphiphilic linear molecule is synthesized and used as a long side chain of the polycarboxylic acid water reducing agent, so that the hydrophilicity of the long side chain is effectively reduced, the winding and curling of the chain are reduced, the steric hindrance effect is improved, and the polycarboxylic acid water reducing agent has a higher water reducing rate at a lower mixing amount.

(2) The polycarboxylate superplasticizer side chain with the polyphosphonate side chain prepared by the invention fundamentally inhibits the intercalation of pure polyethylene glycol side chain in soil, and has excellent mud-resistant and plastic-retaining properties.

(3) The polycarboxylate superplasticizer with polyphosphonate side chains prepared by the invention can inhibit post-bleeding of concrete mixtures, promote forward progress of cement hydration process, reduce the concentration of free water of a system, and prevent unfavorable construction phenomena such as bottom grabbing of the concrete mixtures, aggregate sinking and the like.

(4) The polycarboxylate water reducer with polyphosphonate side chains prepared by the invention can be compounded with small materials such as an early strength agent, a retarder, a viscosity regulator, a bubble regulator and the like for use, and can be used as a functional polycarboxylate water reducer after being compounded.

Detailed Description

A polycarboxylate water reducing agent with polyphosphonate side chains is characterized in that: the polycarboxylate superplasticizer with polyphosphonate side chains is of a comb-shaped structure, the side chains are composed of polyethylene glycol-polyphosphonate monomethyl ether, and the molecular formula of the polycarboxylate superplasticizer is as shown in formula (I):

（Ⅰ）

in the formula (I), a and b are integers different from 0, a is an integer between 30 and 100, a: b =1 ~ 10.

Further, the number average molecular weight of the polycarboxylate superplasticizer with the polyphosphonate side chain is 10000-150000.

A preparation method of a polycarboxylate water reducer with polyphosphonate side chains is used for preparing the polycarboxylate water reducer with polyphosphonate side chains as claimed in any one of claims 1 to 2, and is characterized in that: the method comprises the following steps:

the method comprises the following steps: placing 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, monohydric alcohol, a solvent A1 and a catalyst B1 in a reactor, replacing gas in the reactor with N2, starting stirring, reacting at normal temperature for 4-7 hours, and distilling to remove the solvent to obtain a product, namely a reaction intermediate P; the structural formula of the reaction intermediate P is shown as the formula (II):

（Ⅱ）

in the formula (II), R is alkyl part of monohydric alcohol, namely one of methyl, ethyl, propyl, isopropanol, n-butyl and isobutyl.

Step two: placing the reaction intermediate P, the polyethylene glycol monomethyl ether, the solvent A2 and the catalyst B2 generated in the step one into a reactor, replacing gas in the reactor by N2, starting stirring, controlling the temperature to be 0-20 ℃, and carrying out ring-opening polymerization reaction to obtain polyethylene glycol-polyphosphonate monomethyl ether linear macromolecules E; the structural formula of the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E is shown as the formula (III):

（Ⅲ）

in the formula (III), n and m are integers, n = 4-40, and m = 4-11.

Step three: and (3) placing the polyethylene glycol-polyphosphonate monomethyl ether E and the polyacrylic acid S prepared in the step two into a single-neck flask with a stirring device, adding a catalyst B3, introducing N2 with water, carrying out esterification grafting at 100-200 ℃, reacting for 4-6 h, and cooling to room temperature to obtain a light yellow solid, namely the polycarboxylate superplasticizer with polyphosphonate side chains.

The steps are as follows: the solvent A1 is one of tetrahydrofuran, benzene, toluene and xylene; the catalyst B1 is one of triethanolamine and diethanolamine; the solvent A2 is one of carbon tetrachloride, dichloromethane and dimethyl sulfoxide; the catalyst B2 is one of 1, 8-diazabicyclo [5.4.0] undec-7-ene, stannous isooctanoate and aluminum isopropoxide; the catalyst B3 is one or more of concentrated H2SO4, 85 wt% phosphonic acid, p-toluenesulfonic acid, p-4-hydroxybenzenesulfonic acid and 4-dimethylaminopyridine in any proportion.

Further, the solvent a1 is tetrahydrofuran.

Further, the solvent a2 is dichloromethane.

Further, the catalyst B2 is 1, 8-diazabicyclo [5.4.0] undec-7-ene.

Further, the polyacrylic acid S is a linear polymer obtained by acrylic acid monomers through free radical reaction, and the number average molecular weight of the polyacrylic acid S is 2000-10000.

Specific example 1:

142.5 parts of 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, 32 parts of methanol, 3 parts of triethanolamine and 500 parts of tetrahydrofuran are placed in a reactor, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, reacting for 7 hours at normal temperature, and after the reaction is finished, distilling and purifying to obtain 138 parts by mass of a reaction intermediate P1. Then 500 parts by mass of dichloromethane, 50 parts by mass of polyethylene glycol monomethyl ether with the average molecular weight of 500 and 2.5 parts by mass of stannous isooctanoate are added into a reactor filled with P1, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, controlling the temperature to be 0-20 ℃, carrying out ring-opening polymerization reaction for 1h, and carrying out distillation and purification to obtain the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E1. Adding 28.8 parts by weight of polyacrylic acid S1 with the average molecular weight of 4000 and 1.5 parts by weight of concentrated sulfuric acid into a reactor, and introducing N₂Carrying out esterification grafting at 160 ℃ with water, and reacting for 4.5h to prepare the polycarboxylate superplasticizer with the polyphosphonate side chains in the mass part of 215.

Wherein a: b = 3.

Specific example 2:

mixing the components in parts by mass142.5 parts of 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, 60 parts of isopropanol, 3.5 parts of triethanolamine and 500 parts of tetrahydrofuran are placed in a reactor, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, reacting for 6 hours at normal temperature, and after the reaction is finished, distilling and purifying to obtain 166 parts by mass of a reaction intermediate P2. Subsequently, 500 parts by mass of methylene chloride, 125 parts by mass of methoxypolyethylene glycol having a number-average molecular weight of 500 and 4.5 parts by mass of 1, 8-diazabicyclo [5.4.0] were charged into a reactor containing P2]Undec-7-enes with N₂And (3) replacing gas in the reactor, starting a stirring device, controlling the temperature to be 0-20 ℃, carrying out ring-opening polymerization reaction for 1h, and carrying out distillation and purification to obtain the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E2. Adding 90 parts by mass of polyacrylic acid S2 with the average molecular weight of 6000 and 1.5 parts by mass of p-toluenesulfonic acid into a reactor, and introducing N₂Carrying out esterification grafting at 165 ℃ with water, and reacting for 4.5h to prepare the polycarboxylate superplasticizer with the polyphosphonate side chains in the mass portion of 376.5 parts.

Wherein a: b =4.

Specific example 3:

142.5 parts of 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, 60 parts of isopropanol, 3.5 parts of diethanolamine and 500 parts of tetrahydrofuran are placed in a reactor, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, reacting for 7 hours at normal temperature, and after the reaction is finished, distilling and purifying to obtain 166 parts by mass of a reaction intermediate P3. Subsequently, 500 parts by mass of methylene chloride, 50 parts by mass of polyethylene glycol monomethyl ether having a mean molecular weight of 1000 and 0.5 part by mass of 1, 8-diazabicyclo [5.4.0] were charged into a reactor containing P3]Undec-7-enes with N₂Replacing gas in the reactor, starting a stirring device, controlling the temperature to be 0-20 ℃, and carrying out ring-opening polymerization reactionAnd (4) performing distillation purification for 1h to obtain the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E3. Adding 25.2 parts by mass of polyacrylic acid S3 with the average molecular weight of 8000 and 1.5 parts by mass of p-toluenesulfonic acid into a reactor, and introducing N₂Carrying out esterification grafting at 175 ℃ with water, and reacting for 4.5h to prepare 240.3 parts by mass of a polycarboxylate superplasticizer with polyphosphonate side chains.

Wherein a: b = 6.

Specific example 4:

142.5 parts of 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, 74 parts of isobutanol, 3.5 parts of diethanolamine and 500 parts of tetrahydrofuran are placed in a reactor, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, reacting for 7 hours at normal temperature, and after the reaction is finished, distilling and purifying to obtain a reaction intermediate P4 with the mass portion of 180 parts. Subsequently, 500 parts by mass of methylene chloride, 150 parts by mass of polyethylene glycol monomethyl ether having a number-average molecular weight of 3000 and 0.5 part by mass of 1, 8-diazabicyclo [5.4.0] were charged into a reactor containing P4]Undec-7-enes with N₂And (3) replacing gas in the reactor, starting a stirring device, controlling the temperature to be 0-20 ℃, carrying out ring-opening polymerization reaction for 1h, and carrying out distillation and purification to obtain the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E4. Adding 36 parts by mass of polyacrylic acid S4 with the average molecular weight of 5000 and 2.5 parts by mass of 85% wt phosphoric acid into a reactor, and introducing N₂Carrying out esterification grafting at 175 ℃ with water, and reacting for 4.5h to prepare 365.1 parts by mass of a polycarboxylate superplasticizer with polyphosphonate side chains.

Wherein a: b = 4.5.

Specific example 5:

142.5 parts of 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, 46 parts of ethanol, 2.5 parts of diethanolamine and 500 parts of tetrahydrofuran are placed in a reactor, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, reacting for 7 hours at normal temperature, and after the reaction is finished, distilling and purifying to obtain 152 parts by mass of a reaction intermediate P5. Then 500 parts by weight of dichloromethane, 150 parts by weight of polyethylene glycol monomethyl ether with the average molecular weight of 3000 and 1.0 part by weight of aluminum isopropoxide are added into a reactor filled with P5, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, controlling the temperature to be 0-20 ℃, carrying out ring-opening polymerization reaction for 1h, and carrying out distillation and purification to obtain the polyethylene glycol-polyphosphonate monomethyl ether linear macromolecule E5. Adding 36 parts by mass of polyacrylic acid S5 with the average molecular weight of 3000 and 2.5 parts by mass of 85% wt phosphoric acid into a reactor, and introducing N₂Carrying out esterification grafting at 175 ℃ with water, and reacting for 4.5h to prepare the polycarboxylate superplasticizer with the polyphosphonate side chains in the mass portion of 337.1 parts.

Wherein a: b = 4.5.

Specific example 6:

142.5 parts of 2-chloro-2-oxo-1, 3, 2-dioxaphospholane, 46 parts of ethanol, 2.5 parts of triethanolamine and 500 parts of tetrahydrofuran are placed in a reactor, and N is adopted₂And (3) replacing gas in the reactor, starting a stirring device, reacting for 7 hours at normal temperature, and after the reaction is finished, distilling and purifying to obtain 152 parts by mass of a reaction intermediate P6. Then 500 parts by mass of dichloromethane, 500 parts by mass of methoxypolyethylene glycol with the average molecular weight of 5000 and 2.0 parts by mass of aluminum isopropoxide are added into a reactor filled with P6, and N is adopted₂Replacing gas in the reactor, starting a stirring device, controlling the temperature to be 0-20 ℃, carrying out ring-opening polymerization reaction for 1h, and carrying out distillation and purification to obtain polyethylene glycol-polyphosphineAcid ester monomethyl ether linear macromolecule E6. Adding 57.6 parts by mass of polyacrylic acid S6 with the average molecular weight of 7000 and 2.5 parts by mass of 4-dimethylaminopyridine into a reactor, and introducing N₂Carrying out esterification grafting at 155 ℃ with water, and reacting for 4.5h to prepare 707.8 parts by mass of a polycarboxylate superplasticizer with polyphosphonate side chains.

Wherein a: b = 7.5.

The dispersion performance of the product, namely the concrete mixture, generated in each specific embodiment is tested:

the test refers to GB8076-2012 concrete admixture to carry out the performance detection of the concrete mixture.

The control group 1 and the control group 2 are commercially available polycarboxylic acid water reducing agents, the mixing amount of the polycarboxylic acid water reducing agents is 0.1% of the mass of cement, and standard cement is selected for experiments.

As can be seen from Table 1, the polycarboxylate superplasticizer with polyphosphonate side chains, prepared by the method disclosed by the invention, has high water reducing performance, so that the concrete mixture has good initial plasticizing performance, and meanwhile, has good fluidity maintaining capability, and the concrete mixture has excellent plasticizing performance for 1 hour.

The specific examples produced the product, namely the soil resistance test:

the test refers to GB8076-2012 concrete admixture to carry out the performance detection of the concrete mixture.

The control group 1 and the control group 2 are commercially available polycarboxylic acid water reducing agents, the mixing amount of the polycarboxylic acid water reducing agents is 0.15% of the mass of cement, and the reference cement and 2% of montmorillonite are selected for experiments.

As can be seen from Table 2, the polycarboxylate superplasticizer with polyphosphonate side chains, prepared by the method, enables a concrete mixture to have better initial plasticizing performance and fluidity retention capability in a mud-containing system.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.