Polyether end group functionalized super early strength polycarboxylate water reducer and preparation method thereof
Patent Information
- Application Number
- CN202310423871.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-20
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2043-04-20
AI Technical Summary
而目前市场上的合成早强型聚羧酸减水剂的早强效果不能完全令人满意，尤其是低温环境下的强度发展缓慢
[0031]1、本发明通过环状二酸酐的醇解制备端羟基接枝羧基的改性聚醚大单体(CA-HPEG)，再与氨基硅氧烷进行酰胺化反应，制备长支链端基为带有胺基、硅烷基环状结构的改性聚醚LPEG，所制得改性聚醚LPEG与酰胺类单体引入共聚反应中，制备长侧链，短主链的超早强型聚羧酸减水剂。
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of building admixture technology, specifically relating to a polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer and its preparation method. Background Technology
[0002] When fabricating precast concrete components or performing concrete construction in low temperatures, it is often necessary to achieve high strength in a short period of time. Traditional concrete design typically employs methods such as reducing water consumption per cubic meter, increasing the strength grade of cement, increasing the amount of cementitious materials per cubic meter of concrete, and improving the quality of aggregates to enhance concrete strength. However, with the increasing depletion of resources and ever-increasing environmental requirements, there is a need to continuously develop new technologies to address the issue of early strength in concrete.
[0003] Early-strength concrete technology is an important technology in the modern construction field. It controls the chemical reaction rate in the cement paste of concrete, enabling the concrete to acquire sufficient strength and workability in a short time, thereby meeting the needs of rapid construction, rapid repair, and emergency maintenance.
[0004] Common inorganic salt-based early-strength agents can improve the early strength of concrete, but their use is limited because they usually contain chloride ions, which can easily cause steel corrosion. Alkylamine-based early-strength agents are also difficult to widely use due to their high cost. Furthermore, most traditional composite early-strength water-reducing agents contain chloride and sulfate salts, which can easily cause alkali-aggregate reactions, negatively impacting the durability of concrete.
[0005] Based on the above issues, the combined use and promotion of early-strength agents with polycarboxylate superplasticizers have been somewhat affected, leading to increased attention being paid to the synthesis of early-strength polycarboxylate superplasticizers. The industry primarily utilizes the designability of polycarboxylate superplasticizer molecules, modifying the main and side chain functional groups or altering the polycarboxylate molecule structure to create superplasticizers with inherent early-strength effects. However, the early-strength performance of currently available synthetic early-strength polycarboxylate superplasticizers is not entirely satisfactory, especially regarding slow strength development at low temperatures.
[0006] Therefore, based on polycarboxylate technology, an ultra-early strength polycarboxylate superplasticizer was prepared by functionalizing polyether end groups to solve the problems of long setting time and low early strength often encountered in concrete construction. This is not only beneficial to improving the quality and construction efficiency of concrete, but also helps to promote the development of the construction industry and the promotion of environmentally friendly building materials, which is of great significance. Summary of the Invention
[0007] The purpose of this invention is to overcome the defects of the prior art and provide a polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer.
[0008] The purpose of this invention is to provide a method for preparing the above-mentioned polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer.
[0009] The technical solution of the present invention is as follows:
[0010] A polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer is prepared by reacting HPEG, modified polyether LPEG, acrylic acid, acrylamide, initiator, reducing agent, chain transfer agent, deionized water, and liquid alkali.
[0011] The modified polyether LPEG is obtained by amidation reaction of hydroxyl-terminated carboxyl polyether macromonomer with 3-aminopropyltrimethylsilane, and the hydroxyl-terminated carboxyl polyether macromonomer is obtained by esterification reaction of 1,2-cyclohexanedicarboxylic anhydride with HPEG.
[0012] In a preferred embodiment of the present invention, the molar ratio of 1,2-cyclohexanedicarboxylic anhydride to HPEG is 1.8-2.2:1.
[0013] More preferably, the molar ratio of the terminal hydroxyl-grafted carboxyl polyether macromonomer to 3-aminopropyltrimethylsilane is 1:1-1.2.
[0014] In a preferred embodiment of the present invention, the initiator is ammonium persulfate and / or potassium persulfate.
[0015] In a preferred embodiment of the present invention, the reducing agent is at least one selected from sodium bisulfite, vitamin C, ferrous sulfate, and glucose.
[0016] In a preferred embodiment of the present invention, the chain transfer agent is at least one selected from mercaptoacetic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, and mercaptoethanol.
[0017] In a preferred embodiment of the present invention, the mass ratio of HPEG, modified polyether LPEG, acrylic acid, acrylamide, initiator, reducing agent and chain transfer agent is 50-90:10.5-52.5:3.5-6:1.4-2.3:0.5-0.6:0.2-0.4:0.3-0.5.
[0018] The preparation method of the above-mentioned polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer includes the following steps:
[0019] (1) Preparation of the terminal hydroxyl-grafted carboxyl polyether macromonomer (CA-HPEG);
[0020] (2) Preparation of the modified polyether LPEG;
[0021] (3) Mix HPEG, modified polyether LPEG and an appropriate amount of deionized water evenly, heat to 35-45℃, add initiator while stirring, and then add mixed solution A and mixed solution B dropwise over 1-4 hours under the condition of keeping at 35-45℃. After the addition is completed, continue to keep the reaction at 35-45℃ for 1-2 hours. Finally, add liquid alkali until the pH is 5.5-6 to obtain the product.
[0022] The mixed solution A is composed of the aforementioned acrylic acid, acrylamide, and deionized water;
[0023] The mixed solution B consists of a reducing agent and a chain transfer agent.
[0024] The synthetic route in this preparation method is as follows:
[0025]
[0026] In a preferred embodiment of the present invention, step (1) involves melting HPEG by stirring at 55-65°C, adding 1,2-cyclohexanedicarboxylic anhydride, and reacting at 55-65°C with stirring for 2-4 hours to obtain the terminal hydroxyl-grafted carboxyl polyether macromonomer. The synthetic route for this step is as follows:
[0027]
[0028] More preferably, step (2) involves: mixing and reacting the terminal hydroxyl-grafted carboxyl polyether macromonomer, 3-aminopropyltrimethylsilane, and concentrated sulfuric acid at a temperature of 55-65°C for 2-4 hours with stirring to obtain the modified polyether LPEG. The synthetic route for this step is as follows:
[0029]
[0030] The beneficial effects of this invention are:
[0031] 1. This invention prepares a modified polyether macromonomer (CA-HPEG) with terminal hydroxyl groups grafted with carboxyl groups by alcoholysis of cyclic dianhydrides, and then performs an amidation reaction with aminosiloxane to prepare a modified polyether LPEG with long-branched end groups containing amino and silane cyclic structures. The obtained modified polyether LPEG is introduced into a copolymerization reaction with amide monomers to prepare an ultra-early strength polycarboxylate superplasticizer with long side chains and short main chains.
[0032] 2. In this invention, a side group with a cyclic structure is introduced into the selected high molecular weight polyether side chain and modified with aminosilane, so that the prepared polymer forms a thick molecular adsorption layer, thereby generating a strong steric hindrance effect, which causes cement particles to repel each other and disperse, resulting in a strong water-reducing and dispersing effect.
[0033] 3. In this invention, due to the ultra-long structure of the polyether side chain, the cyclic structure of the side group, and the macromolecular structure of the silane crosslinking monomer, the dispersion degree of CSH gel is improved, the hydration of C3A is promoted, and the formation of AFt is accelerated, thereby shortening the setting time and improving the early strength of cement-based materials.
[0034] 4. In this invention, the amino groups introduced into the polyether side groups and the amide groups introduced into the main chain have strong complexing ability and can react with Ca in the solution after dissolving in water. 2+ This combination forms a stable complex structure, accelerating the formation of AFt. Simultaneously, the siloxane groups introduced into the polyether side groups react with Ca in the cement-based materials. 2+ Bonding, and Ca 2+ The other end is linked to -O-Si-O bonds to form ionic crosslinks, which significantly increases the degree of polymerization of the hydration product CHH gel, further improving the early strength of cement-based materials.
[0035] 5. The preparation method of the present invention adopts atmospheric pressure production, has low equipment requirements, is easy to operate, and is conducive to industrial production. Detailed Implementation
[0036] The technical solution of the present invention will be further explained and described below through specific embodiments.
[0037] The structural formula of the following HPEG is CH2=CHCH2O(CH2CH2O). n H, n = 110.
[0038] Preparation of hydroxyl-terminated carboxyl-grafted polyether macromonomer (CA-HPEG): 100 g of HPEG (0.02 mol) was added to a reaction vessel and stirred until melted at 60 °C. Then, 6.17 g of 1,2-cyclohexanedicarboxylic anhydride (0.04 mol) was added. The reaction temperature was maintained within the range of 60 ± 5 °C. After the addition was complete, the reaction was stirred at 60 °C for another 3 h to obtain CA-HPEG, wherein the molar ratio of cyclohexanedicarboxylic anhydride to HPEG was 2:1.
[0039] Preparation of modified polyether LPEG: 106.17g CA-HPEG (0.02mol) and 2.89g 3-aminopropyltrimethylsilane (0.022mol) were added to a reaction vessel, heated to 60℃, and 1.96g concentrated sulfuric acid was added. The mixture was stirred at 60℃ for 3h to obtain modified polyether LPEG. The molar ratio of CA-HPEG to 3-aminopropyltrimethylsilane was 1:1.1.
[0040] Example 1
[0041] Add 90g of HPEG, 10.5g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.55g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 5.76g AA, 1.42g Am, and deionized water, and a mixed solution B of 0.3g Vc and 0.4g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the ultra-early strength polycarboxylate superplasticizer LPC-1.
[0042] Example 2
[0043] Add 80g of HPEG, 21g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.55g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 5.76g AA, 1.42g Am, and deionized water, and a mixed solution B of 0.3g Vc and 0.4g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the ultra-early strength polycarboxylate superplasticizer LPC-2.
[0044] Example 3
[0045] Add 70g of HPEG, 31.5g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.55g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 5.76g AA, 1.42g Am, and deionized water, and a mixed solution B of 0.3g Vc and 0.4g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-3.
[0046] Example 4
[0047] Add 60g of HPEG, 42g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.55g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 5.76g AA, 1.42g Am, and deionized water, and a mixed solution B of 0.3g Vc and 0.4g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-4.
[0048] Example 5
[0049] 50g of HPEG, 52.5g of LPEG, and an appropriate amount of deionized water were added to the reactor. The reactor temperature was raised to 40±3℃ with continuous stirring. Once the reactor stabilized at 40±3℃, 0.55g of initiator was added in a single addition while continuously stirring. The reactor was then kept at 40±3℃, and a mixed solution A consisting of 5.76g of AA, 1.42g of Am, and deionized water, and a mixed solution B consisting of 0.3g of Vc and 0.4g of mercaptopropionic acid were added dropwise over 1 to 4 hours. After the addition was complete, the reactor was kept at 40±3℃ for 1-2 hours. Finally, liquid alkali was added to the reactor to adjust the final pH to 5.5-6, yielding the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-5.
[0050] Example 6
[0051] Add 60g of HPEG, 42g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.53g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 5.04g AA, 1.59g Am, and deionized water, and a mixed solution B of 0.3g Vc and 0.35g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-6.
[0052] Example 7
[0053] Add 60g of HPEG, 42g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.5g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 4.32g AA, 1.8g Am, and deionized water, and a mixed solution B of 0.25g Vc and 0.32g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-7.
[0054] Example 8
[0055] Add 60g of HPEG, 42g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.5g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 3.6g AA, 2.01g Am, and deionized water, and a mixed solution B of 0.25g Vc and 0.32g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-8.
[0056] Example 9
[0057] Add 60g of HPEG, 42g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.5g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 4.68g AA, 1.8g Am, and deionized water, and a mixed solution B of 0.25g Vc and 0.3g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-9.
[0058] Example 10
[0059] Add 60g of HPEG, 42g of LPEG, and an appropriate amount of deionized water to the reactor. While stirring continuously, raise the reactor temperature to 40±3℃. Once the reactor stabilizes at 40±3℃, add 0.5g of initiator in one go while stirring continuously. Then, keep the reactor at 40±3℃ and add dropwise a mixed solution A of 4.68g AA, 2.22g Am, and deionized water, and a mixed solution B of 0.25g Vc and 0.3g mercaptopropionic acid, controlling the addition to be completed within 1 to 4 hours. After the addition is complete, keep the reactor at 40±3℃ for 1-2 hours. Finally, add liquid alkali to the reactor and adjust the final pH to 5.5-6 to obtain the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer LPC-10.
[0060] Comparative Example 1
[0061] 100g of HPEG and an appropriate amount of deionized water were added to the reactor. The reactor temperature was raised to 40±3℃ with continuous stirring. Once the reactor stabilized at 40±3℃, 0.7g of initiator was added at once with continuous stirring. The reactor was then kept at 40±3℃, and a mixed solution A of 12g AA and deionized water, and a mixed solution B of 0.35g Vc and 0.35g mercaptopropionic acid were added dropwise over 1 to 4 hours. After the addition was complete, the reactor was kept at 40±3℃ for 1-2 hours. Finally, liquid alkali was added to the reactor to adjust the final pH to 5.5-6, yielding the anionic polycarboxylate superplasticizer. This sample was recorded as Comparative Example 1.
[0062] The technical effects of the products obtained in Examples 1 to 10 and the comparative examples are shown in the following experiments:
[0063] Cement mortar strength test
[0064] For the ultra-early-strength polycarboxylate superplasticizers prepared in Examples 1-10 above and the anionic polycarboxylate superplasticizers obtained in the comparative examples, cement mortar tests were conducted according to GB / T8077-2000 "Test Method for Homogeneity of Concrete Admixtures". The cement used in the tests was reference cement, the sand was standard sand, the water content in the mortar was 160g, and the superplasticizer dosage was determined based on achieving a mortar flowability of 130mm-140mm. The prepared mortar was molded and placed in a curing chamber or fog chamber at a temperature of 20±1℃ and a relative humidity of not less than 90% for 24h±2h before demolding. It was then placed in water for 2 days, removed, and placed in a dry curing chamber at a temperature of 20℃±3℃ and a relative humidity of 50%±4%. The compressive strength was measured at 1d, 3d, 7d, and 28d from the molding date. Comparative Example 2 was selected as a commercially available early-strength mother liquor. The cement mortar mix proportions are shown in Table 1. The test results are shown in Table 2.
[0065] Table 1 Cement Mortar Mix Proportion
[0066]
[0067]
[0068] Table 2. Test results of mechanical properties of cement mortar under different implementation schemes.
[0069]
[0070] As shown in Table 2, the present invention exhibits good dispersibility in cement mortar and effectively improves the early strength of cement mortar. Compared with the comparative anionic polycarboxylate superplasticizer, the compressive strength of cement mortar increased by approximately 2.7-5.4 MPa at 1 day, approximately 2.0-4.6 MPa at 3 days, approximately 0.2-3.2 MPa at 7 days, and approximately 0.1-2.3 MPa at 28 days.
[0071] Concrete mechanical property test
[0072] The slump of the fresh concrete was maintained at 200±10mm by adjusting the water-reducing agent dosage. The concrete mix proportions are shown in Table 3, and the test results are shown in Table 4. Comparative Example 2 was selected as a commercially available early-strength type mother liquor.
[0073] Table 3 Concrete Mix Proportions
[0074]
[0075]
[0076] Table 4. Test results of concrete mechanical properties under different implementation schemes.
[0077]
[0078] As shown in Table 4, the concrete performance tests conducted using the raw materials and mix proportions described in Table 3 demonstrate that the low-sensitivity, ultra-early-strength polycarboxylate superplasticizer provided by this invention effectively improves the 1-day, 3-day, and 7-day early strength of concrete while maintaining good dispersibility, and has no adverse effect on the 28-day strength. Compared with the comparative example, the maximum improvement is 35.8% at 1 day, 21.7% at 3 days, 16.7% at 7 days, and 8.9% at 28 days.
[0079] The present invention has suitable reaction conditions, simple and efficient process, low cost, and is suitable for large-scale industrial production. Moreover, the water-reducing agent has excellent performance, with good dispersibility and early strength.
[0080] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.
Claims
1. A polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer, characterized in that: It is made by reacting HPEG, modified polyether LPEG, acrylic acid, acrylamide, initiator, reducing agent, chain transfer agent, deionized water and liquid alkali, wherein, The modified polyether LPEG is obtained by amidation reaction of hydroxyl-terminated carboxyl polyether macromonomer with 3-aminopropyltrimethylsilane, and the hydroxyl-terminated carboxyl polyether macromonomer is obtained by esterification reaction of 1,2-cyclohexanedicarboxylic anhydride with HPEG.
2. The polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer as described in claim 1, characterized in that: The molar ratio of 1,2-cyclohexanedicarboxylic anhydride to HPEG is 1.8-2.2:
1.
3. The polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer as described in claim 2, characterized in that: The molar ratio of the terminal hydroxyl-grafted carboxyl polyether macromonomer to 3-aminopropyltrimethylsilane is 1:1-1.
2.
4. The polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer as described in claim 1, characterized in that: The initiator is ammonium persulfate and / or potassium persulfate.
5. The polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer as described in claim 1, characterized in that: The reducing agent is at least one of sodium bisulfite, vitamin C, ferrous sulfate, and glucose.
6. The polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer as described in claim 1, characterized in that: The chain transfer agent is at least one of mercaptoacetic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, and mercaptoethanol.
7. A polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer according to any one of claims 1 to 6, characterized in that: The mass ratio of HPEG, modified polyether LPEG, acrylic acid, acrylamide, initiator, reducing agent and chain transfer agent is 50-90:10.5-52.5:3.5-6:1.4-2.3:0.5-0.6:0.2-0.4:0.3-0.
5.
8. A method for preparing a polyether-terminated functionalized ultra-early strength polycarboxylate superplasticizer according to any one of claims 1 to 7, characterized in that: Includes the following steps: (1) Preparation of the terminal hydroxyl-grafted carboxyl polyether macromonomer; (2) Preparation of the modified polyether LPEG; (3) Mix HPEG, modified polyether LPEG and an appropriate amount of deionized water evenly, heat to 35-45℃, add initiator while stirring, and then add mixed solution A and mixed solution B dropwise over 1-4 hours under the condition of keeping at 35-45℃. After the addition is completed, continue to keep the reaction at 35-45℃ for 1-2 hours. Finally, add liquid alkali until the pH is 5.5-6 to obtain the product. The mixed solution A is composed of the aforementioned acrylic acid, acrylamide, and deionized water; The mixed solution B consists of a reducing agent and a chain transfer agent.
9. The preparation method according to claim 8, characterized in that: Step (1) involves stirring and melting HPEG at 55-65℃, adding 1,2-cyclohexanedicarboxylic anhydride, and stirring and reacting at 55-65℃ for 2-4 hours to obtain the terminal hydroxyl-grafted carboxyl polyether macromonomer.
10. The preparation method according to claim 9, characterized in that: Step (2) is as follows: at a temperature of 55-65°C, the terminal hydroxyl-grafted carboxyl polyether macromonomer, 3-aminopropyltrimethylsilane and concentrated sulfuric acid are stirred and mixed for 2-4 hours to obtain the modified polyether LPEG.