CN114751674A - Composite polycarboxylate superplasticizer and preparation method thereof - Google Patents

Composite polycarboxylate superplasticizer and preparation method thereof Download PDF

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CN114751674A
CN114751674A CN202210507358.8A CN202210507358A CN114751674A CN 114751674 A CN114751674 A CN 114751674A CN 202210507358 A CN202210507358 A CN 202210507358A CN 114751674 A CN114751674 A CN 114751674A
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ammonium salt
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Xinji Muhu Concrete Co ltd
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Abstract

The invention provides a compound polycarboxylate superplasticizer and a preparation method thereof, belonging to the technical field of superplasticizers. The compound polycarboxylate superplasticizer comprises the following raw materials in parts by weight: 40-60 parts of quaternary ammonium salt long-chain monomer, 15-25 parts of methacrylic acid monomer, 20-30 parts of maleic anhydride monomer, 1-3 parts of vitamin C and 3-7 parts of retarder; the quaternary ammonium salt long-chain monomer has the following structure, wherein n = 8-20. The composite polycarboxylate superplasticizer prepared by the invention has good early strength and slump loss resistanceThe slow setting effect can obviously improve the performance of cement, has high water reducing rate and low sensitivity, has excellent adaptability to different cement, fly ash and concrete soil contents, temperatures and water consumption, and has obvious application prospect.

Description

Composite polycarboxylate superplasticizer and preparation method thereof
Technical Field
The invention relates to the technical field of water reducing agents, and particularly relates to a compound polycarboxylic acid water reducing agent and a preparation method thereof.
Background
The water reducing agent is an essential chemical admixture for improving slag-based cementing materials and concrete products, and can obviously improve the comprehensive properties of the products such as workability, compactness, strength, durability and the like under the condition of lower water-cement ratio.
The polycarboxylic acid water reducer is a third-generation water reducer product, can greatly improve the comprehensive performance of the slag-based cementing material and concrete, has the characteristics of low mixing amount, environmental protection, large degree of freedom of molecular structure and the like, and has extremely wide application prospect.
At present, the domestic and foreign researches on the polycarboxylic acid water reducing agent mainly focus on the following aspects: (1) research on polymer synthesis methods and processes; (2) exploring the relation between the structure and the performance; (3) designing polymer molecules through the existing theoretical basis; (4) the action mechanism of the water reducing agent is presumed according to the relationship between the structure and the performance; (5) gradually explores a new process for synthesizing the water reducer with better performance through the guidance of action mechanism and research rule.
Due to the diversity of molecular structure design of the polycarboxylic acid water-reducing agent and the inevitable relation between the structure and the performance, the research in the field is very active, and the number of novel high-performance polycarboxylic acid water-reducing agents is large.
The polycarboxylate superplasticizer is a graft copolymer with surface activity, has a comb-shaped structure and usually comprises two basic components of a main chain and a side chain.
The main chain of the water reducing agent generally contains a large number of ionizable carboxyl groups, and after the carboxyl groups are ionized in water, the water reducing agent molecules are adsorbed and anchored on the surfaces of cement particles through the action force among ions, so that electrostatic repulsion force exists among the cement particles; the side chain is usually a hydrophilic polyether long chain such as polyethylene glycol monomethyl ether or polypropylene glycol monomethyl ether with the relative molecular weight of 500-3000, and the side chain can be fully extended in water, so that steric hindrance repulsion is provided for cement particles, and the dispersibility of the cement particles is improved.
The two repulsive forces act together to greatly improve the dispersibility of cement particles, so that the cement product added with the polycarboxylic acid water reducing agent has excellent comprehensive performance.
For the polycarboxylic acid type water reducing agent, carboxyl is the basis for the interaction between the water reducing agent molecules and cement particles, and after the polycarboxylic acid type water reducing agent is mixed with cement and water, carboxyl groups can react with the cement particles in the following modes: part of carboxyl is ionized into carboxylate ions, and the carboxylate ions and cations on the surfaces of cement particles generate an electrostatic attraction effect, so that water reducer molecules can be adsorbed on the surfaces of the cement particles and play a role; carboxylate ions after partial ionization are dissociated in a water phase and generate electrostatic repulsion with anions on other cement particles to prevent agglomeration among the cement particles; when the water reducing agent molecules are adsorbed on the surfaces of the cement particles, the carboxyl groups on the outer sides can form water film coating layers on the outer portions of the cement particles by utilizing the strong hydrophilicity of the carboxyl groups, so that the frictional resistance among the cement particles is effectively reduced, and the fluidity is improved; carboxylate ions after ionization can form a complex with calcium ions in the cement paste, so that the calcium ions in the cement paste are reduced, and the early hydration of cement is delayed; fifthly, too high carboxyl density causes too strong adsorption, thus reducing the dispersion retention of the water reducing agent.
And sixthly, the HLB value of the water reducing agent can be effectively changed by adjusting the proportion of hydrophilic groups and hydrophobic groups in the water reducing agent, so that the cement keeps proper air-entraining property.
However, the polycarboxylic acid high-efficiency water reducing agent still has some defects: firstly, the slump loss resistance is insufficient in a high-temperature environment; secondly, the temperature sensitivity is high, the same polycarboxylic acid water reducer is constructed in different seasons, the slump loss resistance is far away, and the construction and maintenance are frequently carried out at the temperature of 5-10 ℃ particularly at lower temperature, such as winter in the northern China; functional products are few, and requirements of ultrahigh and ultra-long distance concrete pumping, negative temperature construction, preparation of ultra-high early strength concrete, high durability of concrete and the like are difficult to meet; the viscosity is high, and the high viscosity of the concrete is not beneficial to construction in the preparation of the concrete with high admixture and low water-cement ratio; fifth, the sensitivity to the mud content of the sandstone aggregate is strong.
Chinese patent CN1412175 discloses a preparation method of allyl ether ester monomer and a method for preparing water reducing agent by using the monomer: allyl ether ester monomer is prepared by treating allyl alcohol polyether with adsorbent such as alumina to make peroxide number below 5.0meq/kg, and esterifying with aliphatic monocarboxylic acid.
Then the refined allyl ether ester monomer and maleic anhydride are used to prepare copolymer with the weight-average molecular weight of 13500 at 80 ℃ by using azobisisobutyronitrile as an initiator, and the copolymer and alkyl polyalkylene glycol are esterified at 100 ℃ to obtain a cement dispersant.
However, the allyl ether ester monomer is poor in reactivity, so that the water-reducing ability and slump-retaining ability of the resulting cement dispersant are unsatisfactory.
Chinese patent CN101205127A discloses a formula of polycarboxylic acid superplasticizer and a manufacturing method thereof, firstly, polyethylene glycol monomethyl ether and maleic anhydride are esterified to generate a macromonomer in the presence of a catalyst and a polymerization inhibitor, and then the macromonomer is copolymerized with allyl polyethylene glycol, acrylic acid and sodium methallyl sulfonate under the condition that ammonium persulfate is used as an initiator to obtain the slow-release polycarboxylic acid superplasticizer.
However, the polymerization activity of allyl polyethylene glycol and polyethylene glycol monomethyl ether maleate is insufficient, and a large amount of allyl polyethylene glycol and polyethylene glycol monomethyl ether maleate remains in the synthesized polycarboxylic acid superplasticizer, resulting in low water-reducing rate and insufficient slump retention performance of the obtained superplasticizer.
Disclosure of Invention
The invention aims to provide a compound polycarboxylic acid water reducing agent and a preparation method thereof, which have good early strength, slump retaining and slow setting effects, can obviously improve the performance of cement, have high water reducing rate and low sensitivity, have excellent adaptability to different cement, fly ash and concrete soil content, temperature and water consumption, have good strength in construction at a lower temperature (5-10 ℃) and have obvious application prospect.
The technical scheme of the invention is realized as follows:
the invention provides a compound polycarboxylate superplasticizer which comprises the following raw materials in parts by weight: 40-60 parts of quaternary ammonium salt long-chain monomer, 15-25 parts of methacrylic acid monomer, 20-30 parts of maleic anhydride monomer, 1-3 parts of vitamin C and 3-7 parts of retarder; the structure of the quaternary ammonium salt long-chain monomer is shown as a formula I:
formula I;
wherein n = 8-20.
Preferably, n = 10-15.
As a further improvement of the present invention, the retarder is selected from at least one of sodium gluconate, citric acid, white sugar and amino trimethylene phosphate.
As a further improvement of the invention, the retarder is a compound composition of sodium gluconate and amino trimethylene phosphate, and the mass ratio of the retarder is (3-5): 2.
as a further improvement of the invention, the preparation method of the quaternary ammonium salt long-chain monomer comprises the following steps:
s1, reacting methyl allyl polyoxyethylene ether (HPEG) with methylsulfonyl chloride (MsCl) to prepare an intermediate A, wherein the structure is as follows:
s2, reacting the intermediate A with 3-amine-1-propanol to obtain an intermediate B, wherein the structure is as follows:
and S3, reacting the intermediate B with hydrochloric acid to obtain a product, namely the quaternary ammonium salt long-chain monomer.
As a further improvement of the invention, the preparation method of the quaternary ammonium salt long-chain monomer specifically comprises the following steps:
S1, introducing nitrogen at 0 ℃, adding 2,4, 6-trimethylpyridine, MsCl, LiCl and methyl allyl polyoxyethylene ether into dichloromethane, and carrying out heating reflux reaction for 1-2h to obtain an intermediate A;
s2, mixing the intermediate A, alkali and 3-amine-1-propanol, heating to 60-80 ℃, and reacting for 3-5 hours to obtain an intermediate B;
and S3, adding the intermediate B into dilute hydrochloric acid, stirring for reaction for 0.5-1h, and filtering to obtain the quaternary ammonium salt long-chain monomer.
As a further improvement of the invention, the base is selected from at least one of DMAP, sodium carbonate, potassium hydroxide, sodium hydroxide, DABCO; the concentration of the dilute hydrochloric acid is 1-3 mol/L.
As a further improvement of the invention, the ratio of the amounts of the substances of 2,4, 6-trimethylpyridine, MsCl, LiCl and methallyl polyoxyethylene ether is (0.01-0.1): (1.02-1.1): (0.2-0.5): 1; the mass ratio of the intermediate A, the alkali and the 3-amine-1-propanol is 1: (0.01-0.1): 1.
the invention further provides a preparation method of the compound polycarboxylate superplasticizer, which comprises the following steps: mixing a quaternary ammonium salt long-chain monomer, a methacrylic acid monomer and a maleic anhydride monomer, heating to reaction temperature and pressure, adding vitamin C and a retarder, preserving heat for 1-2 hours after dropwise adding is finished, adding an alkali solution to adjust the pH value to 6-7, cooling to room temperature, and supplementing water to obtain the compound polycarboxylic acid water reducer.
As a further improvement of the invention, the solid content of the compound type polycarboxylate superplasticizer is 40-50%.
As a further improvement of the invention, the reaction temperature is 90-120 ℃, and the pressure is below 0.5 MPa.
The invention has the following beneficial effects: the invention synthesizes the quaternary ammonium salt long-chain monomer, the long-side chain can generate stronger mutual exclusion effect, and the mutual exclusion effect can lead the molecules of the water reducing agent to be dispersed more uniformly, thereby leading the function of the water reducing agent to be exerted more quickly and fully, leading the early strength of the concrete to be improved quickly, simultaneously having good low temperature resistance, and leading the strength of the concrete prepared under the low temperature condition to be still higher; meanwhile, the water reducing agent is a quaternary ammonium salt water reducing agent, and the salt water reducing agent can still keep better water reducing performance in a lower external environment so as to meet concrete operation under a low-temperature condition.
Meanwhile, the monomer comprises a monomer quaternary ammonium salt long-chain monomer containing cations, a monomer maleic anhydride containing anions and methacrylic acid, the obtained compound polycarboxylate water reducer contains cations and anions, is an amphoteric polycarboxylate water reducer, can obviously improve the slump retaining performance of the water reducer, and can generate electrostatic interaction with silicate molecules after the amphoteric functional water reducer is introduced, so that the cement performance is improved by the electrostatic interaction;
In addition, the retarder is added, is a compound composition of sodium gluconate and amino trimethylene phosphate, and is compounded with other monomers, so that the retarding effect of the compound polycarboxylic acid water reducing agent is optimal when the mixing amount of the retarder is 3-7 parts by weight.
The composite polycarboxylate superplasticizer prepared by the invention has good early strength, slump retaining and slow setting effects, can obviously improve the performance of cement, has high water reducing rate and low sensitivity, has excellent adaptability to different cement, fly ash and concrete soil content, temperature and water consumption, and has obvious application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The embodiment provides a preparation method of a compound polycarboxylate superplasticizer, which comprises the following specific steps:
(1) the preparation method of the quaternary ammonium salt long-chain monomer comprises the following steps:
S1, introducing nitrogen at 0 ℃, adding 0.01mol of 2,4, 6-trimethylpyridine, 1.02mol of MsCl, 0.2mol of LiCl and 1mol of HPEG 2400 into 100mL of dichloromethane, heating, refluxing, reacting for 1h, filtering, and washing for 2 times by using the dichloromethane to obtain an intermediate A; the equation is as follows:
s2, mixing 1mol of the intermediate A, 0.01mol of alkali and 1mol of 3-amine-1-propanol, adding the mixture into 200mL of dichloromethane, heating the mixture to 60 ℃, reacting for 3 hours, filtering, and washing the mixture with dichloromethane for 2 times to obtain an intermediate B; the equation is as follows:
s3, adding 1mol of the intermediate B into 100mL of 1mol/L dilute hydrochloric acid, stirring for reaction for 0.5h, filtering, washing with deionized water to obtain a quaternary ammonium salt long-chain monomer, wherein the equation is as follows:
(2) the preparation method of the compound polycarboxylate superplasticizer comprises the following steps: mixing 40 parts by weight of quaternary ammonium salt long-chain monomer, 15 parts by weight of methacrylic acid monomer and 20 parts by weight of maleic anhydride monomer, heating to the reaction temperature of 90 ℃, adding 2 parts by weight of vitamin C and 3 parts by weight of retarder after the pressure is below 0.5MPa, preserving heat for 1h after dropwise adding is finished, adding alkali solution to adjust the pH value to be 6, cooling to room temperature, and supplementing water to obtain the composite polycarboxylate superplasticizer with the solid content of 40-50%.
(3) The retarder is a compound composition of sodium gluconate and amino trimethylene phosphate, and the mass ratio is 3: 2.
Example 2
The embodiment provides a preparation method of a compound polycarboxylate superplasticizer, which comprises the following specific steps:
(1) the preparation method of the quaternary ammonium salt long-chain monomer comprises the following steps:
s1, introducing nitrogen at 0 ℃, adding 0.1mol of 2,4, 6-trimethylpyridine, 1.1mol of MsCl, 0.5mol of LiCl and 1mol of HPEG 2400 into 100mL of dichloromethane, heating and refluxing for reaction for 2h, filtering, and washing with dichloromethane for 2 times to obtain an intermediate A;
s2, mixing 1mol of the intermediate A, 0.1mol of alkali and 1mol of 3-amine-1-propanol, adding the mixture into 200mL of dichloromethane, heating the mixture to 80 ℃, reacting for 5 hours, filtering, and washing the mixture with dichloromethane for 2 times to obtain an intermediate B;
s3, adding 1mol of the intermediate B into 100mL of 3mol/L dilute hydrochloric acid, stirring for reaction for 1 hour, filtering, and washing with deionized water to obtain the quaternary ammonium salt long-chain monomer.
(2) The preparation method of the compound polycarboxylate superplasticizer comprises the following steps: mixing 60 parts by weight of quaternary ammonium salt long-chain monomer, 25 parts by weight of methacrylic acid monomer and 30 parts by weight of maleic anhydride monomer, heating to the reaction temperature of 120 ℃, adding 2 parts by weight of vitamin C and 7 parts by weight of retarder after the pressure is below 0.5MPa, preserving heat for 2 hours after dropwise adding, adding alkali solution to adjust the pH value to 7, cooling to room temperature, and supplementing water to obtain the compound polycarboxylate superplasticizer with the solid content of 50%.
The retarder is a compound composition of sodium gluconate and amino trimethylene phosphate, and the mass ratio is 5: 2.
example 3
The embodiment provides a preparation method of a compound polycarboxylate superplasticizer, which comprises the following specific steps:
(1) the preparation method of the quaternary ammonium salt long-chain monomer comprises the following steps:
s1, introducing nitrogen at 0 ℃, adding 0.05mol of 2,4, 6-trimethylpyridine, 1.05mol of MsCl, 0.35mol of LiCl and 1mol of HPEG 2400 into 100mL of dichloromethane, heating, refluxing, reacting for 1.5h, filtering, and washing for 2 times by using the dichloromethane to obtain an intermediate A;
s2, mixing 1mol of the intermediate A, 0.05mol of alkali and 1mol of 3-amine-1-propanol, adding the mixture into 200mL of dichloromethane, heating the mixture to 70 ℃, reacting for 4 hours, filtering, and washing with dichloromethane for 2 times to obtain an intermediate B;
s3, adding 1mol of the intermediate B into 100mL of 2mol/L dilute hydrochloric acid, stirring for reaction for 0.75h, filtering, and washing with deionized water to obtain the quaternary ammonium salt long-chain monomer.
(2) The preparation method of the compound polycarboxylate superplasticizer comprises the following steps: mixing 50 parts by weight of quaternary ammonium salt long-chain monomer, 20 parts by weight of methacrylic acid monomer and 25 parts by weight of maleic anhydride monomer, heating to the reaction temperature of 110 ℃, adding 2 parts by weight of vitamin C and 5 parts by weight of retarder after the pressure is below 0.5MPa, preserving heat for 1.5 hours after dropwise adding, adding alkali solution to adjust the pH value to 6.5, cooling to room temperature, and supplementing water to obtain the compound polycarboxylate superplasticizer with the solid content of 45%.
The retarder is a compound composition of sodium gluconate and amino trimethylene phosphate, and the mass ratio of the retarder to the retarder is 4: 2.
example 4
Compared with example 3, the retarder is sodium gluconate, and other conditions are not changed.
Example 5
Compared with example 3, the retarder was amino trimethylene phosphate, and other conditions were not changed.
Comparative example 1
Compared with the example 3, the quaternary ammonium salt long-chain monomer is replaced by the methyl allyl polyoxyethylene ether (the molecular weight is about 2400) with equal mass, and other conditions are not changed.
The preparation method of the compound polycarboxylic acid water reducing agent comprises the following steps: mixing 50 parts by weight of methyl allyl polyoxyethylene ether, 20 parts by weight of methacrylic acid monomer and 25 parts by weight of maleic anhydride monomer, heating to the reaction temperature of 110 ℃, adding 2 parts by weight of vitamin C and 5 parts by weight of retarder after the pressure is below 0.5MPa, preserving the heat for 1.5h after dropwise adding, adding alkali solution to adjust the pH value to 6.5, cooling to room temperature, and supplementing water to obtain the composite polycarboxylate superplasticizer with the solid content of 45%.
The retarder is a compound composition of sodium gluconate and amino trimethylene phosphate, and the mass ratio of the retarder to the retarder is 4: 2.
comparative example 2
Compared with the embodiment 3, the quaternary ammonium salt long-chain monomer is replaced by dimethylaminoethyl methacrylate with equal mass, and other conditions are not changed.
The preparation method of the compound polycarboxylic acid water reducing agent comprises the following steps: mixing 50 parts by weight of dimethylaminoethyl methacrylate, 20 parts by weight of methacrylic acid monomer and 25 parts by weight of maleic anhydride monomer, heating to the reaction temperature of 110 ℃, adding 2 parts by weight of vitamin C and 5 parts by weight of retarder after the pressure is below 0.5MPa, preserving the heat for 1.5h after dropwise adding, adding an alkali solution to adjust the pH value to be 6.5, cooling to room temperature, and supplementing water to obtain the composite polycarboxylate superplasticizer with the solid content of 45%.
The retarder is a compound composition of sodium gluconate and amino trimethylene phosphate, and the mass ratio of the retarder to the retarder is 4: 2.
test example
Experiments are carried out on the composite polycarboxylic acid water reducing agent prepared in the embodiments 1-5 and the comparative examples 1-3 of the invention, the cement used for cement is Kyuzhai P.O42.5, the water cement ratio is 0.29, and the folding solid content of the water reducing agent is 0.2%.
The sand is medium sand with fineness modulus M =2.65, the particle size of the gravel is 5-25mm, and the concrete proportion is shown in Table 1.
The preparation method of the concrete comprises the following steps: uniformly mixing the stones, the sand and the cement to obtain a mixture, mixing a water reducing agent and water to prepare a solution, adding the solution into the mixture, uniformly stirring and mixing, and curing at 10 ℃ for 24 hours to obtain the concrete.
TABLE 1C 30 concrete mixing ratio (kg/m)3
Ingredients Stone (stone) Sand Cement Water (I)
Amount of the composition 1110 775 332 185
The concrete slump is tested according to GB/T50080-2002 Standard for testing the performance of common concrete mixtures, and the compressive strength is tested according to GB/T50081-2002 Standard for testing the mechanical properties of common concrete, wherein the curing condition is carried out at the temperature of 10 ℃.
The concrete setting time is tested according to GB/T8077-2012 Experimental method for the homogeneity of concrete admixtures.
The results are shown in Table 2.
TABLE 2
As can be seen from Table 3, under the conditions of the same solid content and lower temperature, the compound polycarboxylic acid water reducer has high slump retaining capacity, excellent slump retaining capacity within 2h and retarding capacity, and simultaneously, the concrete has high strength.
The present invention is not limited to the above-described preferred embodiments, but rather, the present invention is to be construed broadly and cover all modifications, equivalents, and improvements falling within the spirit and scope of the present invention.

Claims (10)

1. The compound polycarboxylate superplasticizer is characterized by comprising the following raw materials in parts by weight: 40-60 parts of quaternary ammonium salt long-chain monomer, 15-25 parts of methacrylic acid monomer, 20-30 parts of maleic anhydride monomer, 1-3 parts of vitamin C and 3-7 parts of retarder; the structure of the quaternary ammonium salt long-chain monomer is shown as a formula I:
A formula I;
wherein n is 8-20.
2. The compound polycarboxylate water reducer according to claim 1, wherein the retarder is selected from at least one of sodium gluconate, citric acid, white sugar and amino trimethylene phosphate.
3. The compound polycarboxylate water reducer according to claim 2, wherein the retarder is a compound composition of sodium gluconate and amino trimethylene phosphate, and the mass ratio of the retarder to the compound polycarboxylate water reducer is (3-5): 2.
4. the compound polycarboxylate water reducer according to claim 1, wherein the quaternary ammonium salt long-chain monomer is prepared by the following steps:
s1, reacting methyl allyl polyoxyethylene ether with MsCl to prepare an intermediate A, wherein the intermediate A has the following structure:
reacting the intermediate A with 3-amine-1-propanol to obtain an intermediate B, wherein the structure is as follows:
and S3, reacting the intermediate B with hydrochloric acid to obtain a product, namely the quaternary ammonium salt long-chain monomer.
5. The compound type polycarboxylate superplasticizer according to claim 4, wherein the preparation method of the quaternary ammonium salt long-chain monomer is as follows:
s1, introducing nitrogen at 0 ℃, adding 2,4, 6-trimethylpyridine, MsCl, LiCl and methyl allyl polyoxyethylene ether into dichloromethane, and heating and refluxing for 1-2h to obtain an intermediate A;
S2, mixing the intermediate A, alkali and 3-amine-1-propanol, heating to 60-80 ℃, and reacting for 3-5 hours to obtain an intermediate B;
s3, adding the intermediate B into dilute hydrochloric acid, stirring for reaction for 0.5-1h, and filtering to obtain the quaternary ammonium salt long-chain monomer.
6. The compound polycarboxylate water reducer according to claim 5, wherein the alkali is at least one selected from DMAP, sodium carbonate, potassium hydroxide, sodium hydroxide and DABCO; the concentration of the dilute hydrochloric acid is 1-3 mol/L.
7. The compound polycarboxylate water reducer according to claim 5, characterized in that the ratio of the amounts of 2,4, 6-trimethylpyridine, MsCl, LiCl and methallyl polyoxyethylene ether is (0.01-0.1): (1.02-1.1): (0.2-0.5): 1; the mass ratio of the intermediate A, the alkali and the 3-amine-1-propanol is 1: (0.01-0.1): 1.
8. the preparation method of the compound type polycarboxylate superplasticizer recorded in any one of 1-7 is characterized by comprising the following steps of: mixing a quaternary ammonium salt long-chain monomer, a methacrylic acid monomer and a maleic anhydride monomer, heating to reaction temperature and pressure, adding vitamin C and a retarder, preserving heat for 1-2 hours after dropwise adding is finished, adding an alkali solution to adjust the pH value to 6-7, cooling to room temperature, and supplementing water to obtain the compound polycarboxylic acid water reducer.
9. The preparation method according to claim 8, characterized in that the solid content of the compound type polycarboxylate superplasticizer is 40-50%.
10. The method according to claim 8, wherein the reaction temperature is 90 to 120 ℃ and the pressure is 0.5MPa or less.
CN202210507358.8A 2022-05-11 2022-05-11 Composite polycarboxylate superplasticizer and preparation method thereof Pending CN114751674A (en)

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