CN114835891A - High molecular weight, potassium and sodium ion content oligoether macromonomer, and preparation method and application thereof - Google Patents
High molecular weight, potassium and sodium ion content oligoether macromonomer, and preparation method and application thereof Download PDFInfo
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- C08G65/2609—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups containing aliphatic hydroxyl groups
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Abstract
The invention discloses a preparation method of an oligoether macromonomer with high molecular weight and potassium-sodium ion content, which comprises the following steps: mixing methallyl alcohol and a displacer to react, obtaining a displaced substrate after the displacement reaction is finished, adding ethylene oxide and propylene oxide to react, and obtaining a polyether monomer intermediate after the reaction is finished; mixing the polyether monomer intermediate with an alkaline solution for reaction, adding ethylene oxide and propylene oxide for reaction after the reaction is finished, and obtaining a polyether macromonomer crude product after the reaction is finished; and (2) sequentially adding a neutralizing agent and an adsorbent into the crude polyether macromonomer product, filtering and washing after the reaction is finished to obtain the polyether macromonomer, wherein the polyether macromonomer has a relative average molecular weight (up to 3000-6000), and when the polyether macromonomer is used as a carboxylic acid water reducing agent, a large steric hindrance can be formed, the water reducing rate and the slump retaining property can be increased, and the water reducing performance can be greatly improved.
Description
Technical Field
The invention relates to the technical field of fine chemical synthesis, in particular to an oligoether macromonomer with high molecular weight and potassium-sodium ion content, and a preparation method and application thereof.
Background
With the continuous and high-speed development of economic construction, the total quantity of the concrete required by heavy projects such as high-speed railways, highways, airports, municipal works, nuclear power, water conservancy and hydropower and the like is increased, and the performance requirement on the concrete is increased, so that the requirements on the concrete are increased while the huge market space is provided for the concrete water reducing agent capable of effectively improving the concrete construction performance and the later performance of the concrete.
In order to better meet engineering requirements, the domestic polycarboxylic acid water reducing agent is developed from initial allyl alcohol polyether to the current polyether product of six carbon alcohols and above. Currently, mainstream products include HPEG2400 and TPEG2400, etc., but the highest number average molecular weight of these mainstream products does not exceed 3000. On one hand, the molecular weight is difficult to increase by adopting the prior art under the action of the alkaline displacer, and on the other hand, the unsaturation degree is reduced after the number average molecular weight is increased, thereby influencing the performance of the water reducing agent synthesized in the later period.
At present, the mainstream of HPEG2400 and TPEG2400 and the like neutralize potassium and sodium ions in the reaction process to form salts, and the salts, such as sodium acetate, generated by the potassium and sodium ions are finally retained in the product, so that a certain retardation effect is achieved in concrete, the hydration reaction of cement is inhibited, and the delayed setting and hardening of the cement are promoted. In the preparation application of concrete, the concrete is mainly used in summer and in construction environments with high air temperature; in winter and in a construction environment with lower air temperature, the retarder can make the concrete not easy to harden, and meanwhile, although the later strength of the concrete is not affected, the 1-3 d early strength of the concrete is reduced, and the service performance is affected.
Disclosure of Invention
The invention provides a preparation method of an oligoether macromonomer with high molecular weight and potassium-sodium ion content, aiming at the problems of poor water reducing performance when the existing polycarboxylic acid monomer is used as a water reducing agent and great influence on early strength when the polycarboxylic acid monomer is used as a retarder, the preparation method comprises the following steps:
carrying out a displacement reaction on methallyl alcohol and a displacer to obtain a displacement substrate, adding ethylene oxide and propylene oxide to react, and obtaining a polyether monomer intermediate after the reaction is finished;
mixing the polyether monomer intermediate with an alkaline solution for reaction, and then adding ethylene oxide and propylene oxide for reaction to obtain a polyether macromonomer crude product;
and sequentially adding a neutralizing agent and an adsorbent into the crude product of the polyether macromonomer, and filtering and washing after the reaction is finished to obtain the polyether macromonomer.
The invention has the beneficial effects that:
(1) the polyether macromonomer prepared by the invention has the advantages of narrow average molecular weight distribution (average molecular weight distribution coefficient is less than 1.06), shortened reaction period, high double bond retention rate (the double bond retention rate is more than 98.2%), low potassium ions and sodium ions and the like.
(2) The polyether macromonomer prepared by the invention has a relative average molecular weight (up to 3000-6000), and when the polyether macromonomer is used as a carboxylic acid water reducing agent, a large steric hindrance can be formed, the water reducing rate and the slump retaining property can be increased, and the water reducing performance can be greatly improved.
(3) The potassium ions and sodium ions in the polyether macromonomer prepared by the invention reach below 10ppm, and the polyether macromonomer has better compressive strength.
(4) The polyether macromonomer prepared by the invention has great application prospect as a retarder and a water reducing agent in the field of buildings.
Detailed Description
The inventors of the present invention found that, when using an existing polycarboxylic acid water reducing agent, the low average molecular weight and the low degree of unsaturation affect the water reducing property thereof and that the problem in which the content of sodium ions and potassium ions is high to cause a long hardening time and the early strength is low causes the range of application to be limited.
As used herein, the term "unsaturation" refers to the sum of the number of carbon-carbon double bonds and twice the number of carbon-carbon triple bonds in an organic compound as a quantitative indicator of the degree of molecular unsaturation in an organic compound, e.g., one carbon-carbon double bond has one unsaturation and one carbon-carbon triple bond has two unsaturations, then if there is one carbon-carbon double bond and one carbon-carbon triple bond in an organic compound, the unsaturation of the organic compound is 3.
As used herein, the term "low average molecular weight" means an organic compound having an average molecular weight of less than 3000, where average molecular weight is understood to mean relative average molecular weight.
As used herein, the term "water-reducing properties" refers to a property exhibited by a class of materials added to concrete or other coatings that reduces the amount of water used, such as lignosulfonates and naphthalene sulfonate formaldehyde polymers.
As used herein, the term "early strength" refers to the hardness of a substance at 1 to 3 days during coagulation, and the term "early strength is low" refers to the hardness of a substance at 1 to 3 days during coagulation of less than 50%.
The inventor of the invention finds that anion active substrates can be generated by adopting the reaction of a displacer and methallyl alcohol, the two-phase fusion is accelerated, and the problems of slow reaction of a conventional catalyst, raw material damage caused by high local temperature and the like are avoided; the defects of wide average molecular weight distribution, long reaction period and the like of the conventional catalyst can be overcome by adding the alkaline solution; and the neutralizing agent and the adsorbent are added to reduce the content of sodium ions and potassium ions, so that the compressive strength of the composite material is enhanced.
According to the present invention, there is provided a process for the preparation of a high molecular weight, potassium-sodium ion content oligoether macromonomer, as used herein, the "high molecular weight" means that the organic compound has an average molecular weight of not less than 3000; as used herein, the "potassium sodium ion content is low" means that the sum of the mass percentages of potassium ions and sodium ions is no more than 10 ppm; as used herein, the "polyether macromonomer" refers to a polyether monomer having an average molecular weight of not less than 3000.
The preparation method comprises the following steps:
s1, mixing methallyl alcohol and a displacer to react, obtaining a displaced substrate after the displacement reaction is finished, adding ethylene oxide and propylene oxide to react, and obtaining a polyether monomer intermediate after the reaction is finished;
as used herein, the "displacer" refers to a substance capable of reacting with methallyl alcohol to produce an anionic active substrate, such as alkali metals, alkali metal compounds, and alkali metal alkaline solutions, and the like, suitably the displacer includes, but is not limited to, at least one of alkali metals, alkali metal compounds, alkali metal alkaline solutions, and benzyltriethylammonium chloride, suitably the alkali metals include, but are not limited to, sodium or potassium, suitably the alkali metal compounds include, but are not limited to, sodium hydride.
The temperature during the mixing reaction of methallyl alcohol and the displacer may be 26 to 65 ℃, suitably 35 to 50 ℃, more suitably 40 to 45 ℃; the reaction time can be adjusted correspondingly according to the addition of each raw material, and is suitably 120-150 min, more suitably 130-140 min.
The reaction of ethylene oxide and propylene oxide may be carried out in an oxygen-free environment, as used herein, which refers to an environment having an oxygen content of less than 200ppm, and the oxygen-free environment may be replaced with an inert gas or nitrogen, and the inert gas or nitrogen may be introduced continuously or intermittently, depending on the time required for the reaction.
The reaction temperature during the reaction of adding ethylene oxide and propylene oxide may be 98-105 ℃, suitably 102-105 ℃; the reaction time can be correspondingly adjusted according to the addition of each raw material, and is properly 110-130 min; after the reaction of adding ethylene oxide and propylene oxide is finished, the temperature can be reduced by water bath or natural cooling, and the temperature after the temperature reduction treatment can be 40-50 ℃, and is suitably 43-45 ℃.
The mass ratio of methallyl alcohol to the displacer may be 97:3 to 5, suitably 97: 4; the mass ratio of the displacement substrate, ethylene oxide and propylene oxide may be 14:86 to 100:0 to 30, and suitably 14:90 to 95.
S2, mixing the polyether monomer intermediate with an alkaline solution for reaction, adding ethylene oxide and propylene oxide for reaction after the reaction is finished, and obtaining a polyether macromonomer crude product after the reaction is finished;
as used herein, the "alkaline solution" refers to a solution having a pH greater than 7, such as an aqueous solution of an alkali metal and sodium methoxide, suitably sodium hydroxide and sodium methoxide, more suitably sodium hydroxide.
The temperature of the polyether monomer intermediate and the alkaline solution in the mixing reaction process can be 70-80 ℃, suitably 75-78 ℃, and the reaction time can be correspondingly adjusted according to the addition amount of each raw material, suitably 0.5-1.0 hour, more suitably 0.8-0.9 hour.
Before the ethylene oxide and the propylene oxide are added for reaction, the product of the reaction in the last step can be dehydrated for 20-30 min, and suitably 24-27 min.
The reaction of the ethylene oxide and propylene oxide may be carried out in an oxygen-free environment, and as used herein, the "oxygen-free environment" refers to an environment having an oxygen content of less than 200ppm, and the oxygen-free environment may be replaced with an inert gas or nitrogen, and the introduction of the inert gas or nitrogen may be continuous or intermittent, depending on the time required for the reaction.
The reaction temperature in the reaction process of adding ethylene oxide and propylene oxide can be 115-125 ℃, suitably 178-122 ℃, and the reaction time can be correspondingly adjusted according to the adding amount of each raw material, suitably 160-190 min, more suitably 175-184 min.
After the reaction of adding ethylene oxide and propylene oxide is finished, cooling treatment can be carried out, the cooling treatment mode can be water bath cooling or natural cooling, and the temperature after cooling treatment can be 80-92 ℃, and is suitably 88-90 ℃; the obtained material can be degassed after the temperature reduction is completed, the purpose is to remove the by-product with low average molecular weight, and the reaction time can be adjusted correspondingly according to the addition amount of each raw material, suitably 20-40 min, more suitably 30-35 min.
The mass ratio of the polyether monomer intermediate to the solute in the alkaline solution may be 250-300: 1, suitably 270-290: 1, more suitably 280-285: 1; the mass ratio of the polyether monomer intermediate to the ethylene oxide to the propylene oxide may be 3: 7-8: 0-3, preferably 3: 7-8: 1-3, more preferably 3: 7-8: 2-3.
And S3, sequentially adding a neutralizing agent and an adsorbent into the crude product of the polyether macromonomer, and filtering and washing after the reaction is finished to obtain the polyether macromonomer.
As used herein, the "neutralizing agent" refers to a substance capable of undergoing an acid-base neutralization reaction with the basic substance in the crude polyether macromonomer, and may be a strong acid solution, a medium-strong acid solution, or a weak acid solution, suitably phosphoric acid and/or phosphorous acid, more suitably phosphoric acid.
As used herein, the "adsorbent" refers to a material capable of adsorbing alkali metal ions, such as alkaline earth metal oxides, attached to the crude polyether macromonomer, including, but not limited to, at least one of alumina, calcia, and magnesia.
In order to ensure that the reaction is completely and quickly carried out, the crude polyether macromonomer product can be heated to 80-90 ℃ firstly, and then deionized water is added into the crude polyether macromonomer product for dissolving, wherein in order to ensure that the dissolution is complete, the mass ratio of the deionized water to the crude polyether macromonomer product can be 1-1.5: 100; in the process, the temperature can be increased to 80-90 ℃ after deionized water is added, and the dissolving time can be correspondingly adjusted according to the adding amount of each raw material, and is properly 20-30 min; and in order to fully react, stirring the mixture after adding the neutralizing agent for 1 to 1.5 hours, adding the adsorbent after stirring, and stirring the mixture again for 20 to 30 minutes.
And after the reaction is finished, raising the temperature to 110-120 ℃ for dehydration treatment, stopping dehydration when the water content of the substance to be dehydrated is lower than 0.2 wt%, repeatedly washing, dehydrating and filtering the reaction product for many times by adopting common filtering equipment such as a plate-and-frame filter in the filtering process, and stopping washing when the total content of potassium ions and sodium ions in the product is not more than 10ppm to obtain the polyether macromonomer.
The mass ratio of the polyether macromonomer crude product, ethylene oxide and propylene oxide may be 3:7 to 8:0 to 3, preferably 3:7 to 8:2 to 3, more preferably 3:7 to 8:2 to 3.
The amount of the adsorbent added may be 0.3 to 0.8 wt%, suitably 0.5 to 0.8 wt% of the crude polyether macromonomer.
The mass ratio of the neutralizing agent to the displacing agent may be 1:1.15 to 1.30, and preferably 1:1.21 to 1.30.
In the present invention, the anion nucleophile is obtained by the displacement reaction in step S1, and the hydroxyl value of the obtained polyether macromonomer is controlled by controlling the introduction ratio of ethylene oxide and propylene oxide in step S2.
The average molecular weight of the polyether monomer intermediate prepared by the invention is 530-650, and the average molecular weight of the polyether macromonomer prepared by the invention is 3000-6000, so that large steric hindrance can be formed, the water reducing rate and slump retaining property can be increased, and the water reducing performance can be greatly improved; narrow average molecular weight distribution (average molecular weight distribution coefficient is less than 1.06), shortened reaction period, high double bond retention rate (double bond retention rate is more than 98.2%), low potassium ion and sodium ion, etc.
The hydroxyl value was measured by the method disclosed in GB/T7383-2020 for measuring the hydroxyl value of a nonionic surfactant in the following examples.
Examples
Example 1
Preparing a polyether macromonomer comprising the steps of:
s1, taking 29.84 parts by mass of methallyl alcohol in a reactor, adding 1.38 parts by mass of sodium metal in 2 times within 30 minutes, controlling the reaction temperature to be 26-30 ℃ and the reaction time to be 150 minutes, replacing nitrogen of a product after the replacement reaction until the oxygen content is 190ppm, heating to 98 ℃, introducing 310.1 parts by mass of ethylene oxide, controlling the reaction temperature to be 98-99 ℃ and the reaction time to be 130 minutes, cooling to 40-43 ℃ after the reaction is finished, obtaining 29.84 parts by mass of a polyether intermediate, and determining the average molecular weight of the polyether intermediate to be 530.
S2, taking 5.56 parts by mass of the polyether intermediate obtained in the step 1 in a reactor, adding 0.08 part by mass of sodium methoxide 2 times within 30 minutes, controlling the reaction temperature to be 55-65 ℃ for 20min, dehydrating for 20min, then replacing with nitrogen until the oxygen content is 180ppm, heating to 98 ℃, introducing 325 parts of ethylene oxide, controlling the reaction temperature to be 115-117 ℃ for 180min, cooling to 90 ℃ after the reaction is finished, degassing and bubbling for 20min, and obtaining 5.56 parts by mass of the polyether macromonomer crude product with the relative average molecular weight of 3000.
S3, heating the crude polyether macromonomer product obtained in the step S2 to 80-90 ℃, adding 8 parts by weight of deionized water, keeping the temperature at 85-90 ℃, stirring for 20min, then adding 0.26 part by weight of phosphoric acid into the reaction kettle, stirring for 1h, adding 0.1 part by weight of alumina, stirring for 20min, heating to 110-112 ℃ for dehydration, dehydrating for 2h until the water content is less than 0.2 wt% and qualified, filtering through a plate and frame filter, washing and filtering for multiple times, sampling from an upper sampling port of the plate and frame filter to test the content of potassium ions and sodium ions, and discharging to obtain the polyether macromonomer A when the total content of the two is less than or equal to 10 ppm.
The polyether macromonomer a obtained in example 1 was detected, and the detection result was: a hydroxyl value of 17.2mgKOH/g, i.e., a relative average molecular weight of 3260, an average molecular weight distribution coefficient of 1.02 by GPC analysis, a double bond retention of 98.5%, and a potassium ion and sodium ion content of 10ppm by atomic absorption spectrophotometer.
Example 2
Preparing a polyether macromonomer comprising the steps of:
s1, taking 14.92 parts by mass of methallyl alcohol in a reactor, adding 0.69 part by mass of sodium metal in 2 batches within 30 minutes, controlling the reaction temperature to be 35-52 ℃ for 140 minutes, replacing the product of the replacement reaction with nitrogen until the oxygen content is 170ppm, heating to 98 ℃, introducing 155.05 parts by mass of ethylene oxide, controlling the reaction temperature to be 98-99 ℃ and the reaction time to be 120 minutes, cooling to 44-48 ℃ after the reaction is finished, and obtaining 14.92 parts by mass of a polyether macromonomer intermediate, wherein the average molecular weight of the polyether macromonomer intermediate is 530.
S2, taking 2.78 parts by mass of the polyether macromonomer intermediate obtained in the step 1 in a reactor, adding 0.04 part by mass of sodium methoxide in 2 batches within 30 minutes, controlling the reaction temperature to be 35-65 ℃ and the reaction time to be 25-28 min, dehydrating for 25-30 min, then replacing nitrogen to oxygen content of 150ppm, heating to 98 ℃, introducing 252 parts by mass of ethylene oxide, controlling the reaction temperature to be 120-125 ℃, reacting for 160min, cooling to 90 ℃ after the reaction is finished, and degassing and bubbling for 20-25 min to obtain 2.78 parts by mass of the polyether macromonomer crude product with the relative average molecular weight of 4500.
S3, taking the crude polyether macromonomer product obtained in the step 2 in a reactor, heating to 80-82 ℃, and adding 4 parts by mass of deionized water. And stirring for 20-24 min at 85-90 ℃, adding 0.13 mass part of phosphoric acid into a reaction kettle, stirring for 1-1.5 h, adding 0.05 mass part of alumina, stirring for 30min, heating to 110-113 ℃, dehydrating for 2h until the water content is less than 0.2 wt% and qualified, filtering by a plate and frame filter, washing and filtering for multiple times, sampling from a sampling port at the upper part of the plate and frame filter to test the content of potassium ions and sodium ions, and discharging when the total content is less than or equal to 10ppm to obtain the polyether macromonomer B.
The polyether macromonomer B obtained in example 2 was detected, and the detection result was: the polyether macromonomer having a hydroxyl value of 12.4mgKOH/g and an average molecular weight of 4500, according to GPC analysis, had an average molecular weight distribution coefficient of 1.03 double bond retention of 98.3%, and a potassium-sodium ion content of 8ppm as measured by atomic absorption spectrophotometer.
Example 3
Preparing a polyether macromonomer comprising the steps of:
s1, taking 5.97 parts by mass of methallyl alcohol in a reactor, adding 0.28 part by mass of sodium metal in 2 batches within 30 minutes, controlling the reaction temperature to be 55-65 ℃ for 132 minutes, replacing the product of the replacement reaction with nitrogen until the oxygen content is 150ppm, heating to 98 ℃, introducing 62.02 parts by mass of ethylene oxide, controlling the reaction temperature to be 98-99 ℃ and the reaction time to be 130 minutes, cooling to 48-50 ℃ after the reaction is finished, and obtaining 5.97 parts by mass of a polyether macromonomer intermediate, wherein the average molecular weight of the polyether macromonomer intermediate is 530.
S2, taking 1.11 parts by mass of the intermediate with the average molecular weight of 530 obtained in the step 1 in a reactor, adding 0.02 part by mass of sodium methoxide in 2 batches within 30 minutes, controlling the reaction temperature to be 55-65 ℃ and the reaction time to be 25-30 min, dehydrating for 20-25 min, then replacing nitrogen until the oxygen content is 180ppm, heating to 98 ℃, introducing 138 parts by mass of ethylene oxide, controlling the reaction temperature to be 122-125 ℃ and the reaction time to be 190min, cooling to 90 ℃ after the reaction is finished, degassing and bubbling for 35min, and obtaining 1.11 parts by mass of the crude polyether macromonomer product with the relative average molecular weight of 6000.
S3, taking the crude polyether macromonomer product obtained in the step 2 in a reactor, heating to 85-88 ℃, adding 0.16 mass part of deionized water, keeping the temperature at 88-90 ℃, stirring for 30min, adding 0.06 mass part of phosphoric acid into a reaction kettle, stirring for 1.5h, adding 0.02 mass part of alumina, stirring for 30min, heating to 115-118 ℃ for dehydration, dehydrating for 2h until the water content is less than 0.2%, filtering through a plate and frame filter, performing multiple washing and filtering, sampling from a sampling port at the upper part of the plate and frame filter to test the content of potassium ions and sodium ions, and discharging to obtain polyether macromonomer C when the total content is less than or equal to 10 ppm.
S4, detecting the polyether macromonomer C obtained in the embodiment 3, wherein the detection result is as follows: a polyether macromonomer having a hydroxyl value of 9.35mgKOH/g and an average molecular weight of 6000, an average molecular weight distribution coefficient of 1.04 by GPC analysis, a double bond retention of 98.2%, and a potassium-sodium ion content of 9ppm as measured by atomic absorption spectrophotometer.
From examples 1-3, the polyether macromonomer prepared by the invention has small average molecular weight distribution coefficient, narrow average molecular weight distribution, average molecular weight of more than 3000, and can shorten the hardening period, form large steric hindrance, increase the water reducing rate and slump retention property, and greatly improve the water reducing performance; the retention rate of double bonds in the polyether macromonomer is more than 98 percent, and the content of potassium ions and sodium ions is low, so that the compressive strength and the early strength of concrete setting can be improved, and the polyether macromonomer has potential application value in the fields of coatings and concrete.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for preparing a high molecular weight, potassium and sodium ion content oligoether macromonomer, comprising:
carrying out a displacement reaction on methallyl alcohol and a displacing agent to obtain a displaced substrate, and adding ethylene oxide and propylene oxide to react to obtain a polyether monomer intermediate;
mixing the polyether monomer intermediate with an alkaline solution for reaction, and then adding ethylene oxide and propylene oxide for reaction to obtain a polyether macromonomer crude product;
and sequentially adding a neutralizing agent and an adsorbent into the crude product of the polyether macromonomer, and filtering and washing after the reaction is finished to obtain the polyether macromonomer.
2. The method according to claim 1, wherein in the step of preparing the polyether monomer intermediate, the reaction of adding ethylene oxide and propylene oxide is performed in an oxygen-free environment.
3. The production method according to claim 1 or 2, characterized in that, in the step of producing the polyether monomer intermediate, the temperature at which the methallyl alcohol is mixed and reacted with the displacer is 26 to 65 ℃, preferably 35 to 50 ℃; the reaction temperature of the added ethylene oxide and propylene oxide is 95-105 ℃.
4. The method according to claim 1, wherein in the step of preparing the crude polyether macromonomer, a degassing bubbling treatment is further performed after the completion of the reaction of adding ethylene oxide and propylene oxide;
the temperature of the mixed reaction of the polyether monomer intermediate and the alkaline solution is 70-80 ℃; the reaction temperature of adding ethylene oxide and propylene oxide is 115-125 ℃.
5. The method according to claim 1, wherein the reaction temperature after adding the neutralizer and the adsorbent in the step of preparing the polyether macromonomer is 80 to 90 ℃.
6. The method according to claim 1, wherein the displacer is at least one of sodium, sodium hydroxide, sodium hydride, and benzyltriethylammonium chloride; preferably, the alkaline solution is sodium hydroxide and/or sodium methoxide; preferably, the neutralizing agent is phosphoric acid and/or phosphorous acid; preferably, the adsorbent is at least one of alumina, calcium oxide, and magnesium oxide.
7. The method according to claim 1, wherein in the step of producing the polyether monomer intermediate, the mass ratio of the methallyl alcohol to the displacer is 97:3 to 5, and preferably the mass ratio of the metathesis substrate, ethylene oxide and propylene oxide is 14:86 to 100:0 to 30.
8. The preparation method of claim 1, wherein in the step of preparing the crude polyether macromonomer product, the mass ratio of the polyether monomer intermediate to the solute in the alkaline solution is 250-300: 1; preferably, the mass ratio of the polyether monomer intermediate to the ethylene oxide to the propylene oxide is 3: 7-8: 0-3; preferably, the mass ratio of the neutralizing agent to the displacing agent is 1: 1.15-1.30; preferably, the adding mass of the adsorbent is 0.3-0.8 wt% of the crude product of the polyether macromonomer; preferably, the average molecular weight of the polyether monomer intermediate is 530-650.
9. The polyether macromonomer prepared by the preparation method of any one of claims 1 to 8, wherein the polyether macromonomer has an average molecular weight of 3000 to 6000, an average molecular weight distribution coefficient of < 1.06, and a total content of potassium ions and sodium ions of 10ppm or less.
10. Use of the polyether macromonomer of claim 9 as a retarder and water reducer in the building field.
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