CN107649068B - Low-molecular-weight cationic polymer dispersant for wet grinding and preparation method thereof - Google Patents
Low-molecular-weight cationic polymer dispersant for wet grinding and preparation method thereof Download PDFInfo
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Abstract
The invention provides a low-molecular-weight cationic polymer dispersant for wet grinding and a preparation method thereof. The polymer dispersant comprises the following components in parts by weight except water: sodium methallyl sulfonate: 7-11 parts of sodium hypophosphite monohydrate: 10-16 parts of hydrogen peroxide: 10-16 parts of ammonium persulfate: 4-8 parts of initiator: 202-305 parts, small monomer solution: 125-390 parts of sodium metabisulfite: 10-20 parts of liquid alkali: 15-40 parts. The method comprises the following steps: 1. feeding for the first time; 2. controlling the temperature; 3. feeding for the second time; 4. and (5) curing. The cationic group of the cationic polymer is compounded by adopting quaternary amine, quaternary phosphine, sulfonic group, phosphate group and amide group, is different from the single amide and DAC compound anchoring effect of common cationic polymer-polyacrylamide, adopts a low-concentration synthesis method in the process, ensures the low molecular weight distribution of the cationic polymer by the concentration of 20 percent, and has the advantages of simple process, short working hour and simple and convenient production.
Description
The technical field is as follows:
the invention relates to the field of building materials, in particular to a low-molecular-weight cationic polymer dispersing agent for wet grinding and a preparation method thereof.
Background art:
the industrial waste residue discharge process is generally a water cooling or wet discharging mode, the water content of water-quenched slag reaches 10-20%, and the water content of wet-discharged fly ash is higher. The existing grinding mode needs to be dried or burnt, and fuel (generally light diesel oil or coal powder) is consumed for removing water in each ton of water-quenched slag by dozens of kilograms, so that the energy consumption of the existing treatment method is increased. The stirring, grinding and wet grinding are adopted, so that the water in the industrial waste residue does not need to be dried, the water in the wet grinding can also play a role of a grinding aid, and the surface energy and the strength of the mineral admixture are reduced; in addition, the agitator applies power directly to the grinding media, with all of the input power being used directly to agitate the grinding media, thereby producing a crushing action for the purpose of efficiently grinding the material.
Wet grinding is adopted to treat the industrial waste residue to prepare slurry concrete mineral admixture (slurry admixture for short) containing certain moisture, and the slurry admixture can be directly used for preparing concrete with various strength grades; the application of the mineral admixture wet grinding treatment technology can reduce the treatment cost and the production energy consumption of industrial waste residues and improve the performance of the mineral admixture, thereby being beneficial to the full play of the admixture effect and comprehensively improving the performance of the cement-based material. The product cannot be over-ground in the wet grinding process, and re-grinding or over-grinding can cause slurry agglomeration and viscosity increase, so that the addition amount of the dispersing agent is increased, and the normal operation of the subsequent process is seriously influenced.
The common inorganic dispersant has no steric hindrance effect, has limited rejection capability and can not reduce the water content of the wet-grinding superfine admixture; common macromolecular polymer dispersants are mostly applied to other industries, and the molecular structure and the size of the dispersant cannot adapt to an application system of the superfine mineral admixture. Taking polyacrylamide as an example, the low molecular weight of the industrial grade product in the market is more than several million molecular weights, the long chain structure of the industrial grade product promotes bridging among particles or enables the particles to flocculate and agglomerate through charge neutralization, the viscosity is increased, in addition, the whole effective adsorption of the whole surface area of the superfine mineral admixture particles with the diameter of several micrometers cannot be realized by the molecular grade, further the application effects of high dispersion and viscosity reduction cannot be achieved, and additionally, the bridging effect can be generated.
Patent CN 103333664A discloses a high-efficiency environment-friendly grinding aid for wet grinding of phosphate ore, which comprises the following components in percentage by mass: 40-50% of auxiliary agent, 10-20% of cationic dispersant, 5-20% of chelating agent and 10-30% of water, wherein the sum of all the components is 100%; the components are uniformly mixed to obtain the high-efficiency environment-friendly grinding aid for wet grinding of phosphate ore. The efficient environment-friendly grinding aid for wet grinding of phosphate ore is liquid at normal temperature, has good fluidity and small using amount, and generally only needs the efficient environment-friendly grinding aid.
Patent CN 103012637A discloses a heavy calcium carbonate wet grinding dispersant and a preparation method thereof. The method takes sodium polyacrylate as a main macromolecular structure, and adds an auxiliary agent X and an auxiliary agent Y to improve the chelation and the wettability of the sodium polyacrylate in the grinding process. The invention can obviously improve the electrostatic repulsion force and the steric hindrance effect of the dispersing agent on calcium carbonate and ensure the smooth grinding.
Patent CN 101322928A discloses a wet grinding dispersant of calcium carbonate, which has excellent dispersion stability in calcium carbonate water slurry, especially the initial viscosity of high-concentration calcium carbonate slurry is low, and the viscosity is little increased or even decreased with time. The invention relates to a calcium carbonate wet grinding dispersant, which is characterized in that: the polymer (W) is obtained by polymerizing 75 to 90 mol% of an alpha, beta-unsaturated acid (A) with 5 to 20 mol% of a monomer (B) and 2 to l0 mol% of a monomer (C) in a polymerization solvent containing 50 to 100 wt% of an aliphatic alcohol having 3 to 5 carbon atoms and 0 to 50 wt% of water at a temperature of 60 to 100 ℃ by using a polymerization initiator.
The invention content is as follows:
the invention aims to provide a low-molecular-weight cationic polymer dispersing agent for wet grinding and a preparation method thereof. The dispersant is used for wet grinding of the wet-discharging mineral admixture, is liquid at normal temperature, and has good homogeneity and small mixing amount. Aiming at industrial waste residues containing 40-60% of wet-discharge mineral admixture water, the amount of 1.0-2.0 kg per ton is dropwise added into the front section of the ball mill according to the measurement, the operation is simple, the grinding efficiency can be improved, the viscosity can be reduced, the fluidity of the wet-milled superfine admixture can be obviously improved, and the water content of the finished wet-milled superfine admixture can be reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a low molecular weight cationic polymer dispersant for wet milling, characterized in that: the polymer dispersant comprises the following components in parts by weight except water:
sodium methallyl sulfonate: 7-11 parts of sodium hypophosphite monohydrate: 10-16 parts of (by weight),
hydrogen peroxide: 10-16 parts of ammonium persulfate: 4-8 parts of initiator: 202-305 parts of (A) a reaction kettle,
small monomer solution: 125-390 parts of sodium metabisulfite: 10-20 parts of (by weight),
liquid caustic soda: 15-40 parts.
The initiator consists of 2.0-5.0 parts of sodium formaldehyde sulfoxylate and 200-300 parts of water.
The small monomer solution consists of 55-120 parts of cationic small monomer, 50-70 parts of acrylamide and 120-200 parts of water.
The cation small monomer is one or two compositions of quaternary ammonium salt cation monomer and quaternary phosphonium salt cation monomer, wherein: quaternary ammonium salt cationic monomers, namely diallyl quaternary ammonium salt, acrylamide alkyl quaternary ammonium salt and acrylamide alkyl quaternary ammonium salt, preferably acryloyloxyalkyl quaternary ammonium salt cationic monomers, namely one or a combination of methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acryloyloxyethyl trimethyl ammonium chloride (DAC); preferably a DMC to DAC composition in a mass ratio of 2: 1; the quaternary phosphonium salt cationic monomer is one or two of tetrakis (hydroxymethyl) phosphonium sulfate (THPS) and p-vinylbenzyl tributyl phosphonium chloride (VBTBPC); the preferred mass ratio is 1:1 of the composition of THPS and VBTBPC; the quaternary ammonium salt cationic monomer is preferably a composition of a quaternary ammonium salt cationic monomer and a quaternary phosphonium salt cationic monomer in a mass ratio of 1: 1.
The liquid alkali is preferably 30-32% of industrial-grade liquid alkali.
A preparation method of a low-molecular-weight cationic polymer dispersant for wet grinding is characterized by comprising the following steps: the method comprises the following steps:
1. feeding for the first time: adding 7-11 parts by mass of sodium methallyl sulfonate, 10-16 parts by mass of sodium hypophosphite monohydrate and 500 parts by mass of water in a reaction kettle, and continuously stirring until the stirring solution has no obvious blocky or agglomerate materials; after homogenization is completed;
2. temperature control: measuring the temperature in the kettle, controlling the temperature to be 5-25 ℃, and adding 10-16 parts of hydrogen peroxide and 4-8 parts of ammonium persulfate at one time after the temperature is stable, wherein the mass fraction of the hydrogen peroxide is 27.5%;
3. and (3) feeding for the second time: after adding hydrogen peroxide and ammonium persulfate for 5min, sequentially dropwise adding an initiator and a small monomer solution, and after adding the initiator, dropwise adding the small monomer solution within 10min, wherein the small monomer solution is dropwise added for 2-4 hours, the dropwise adding time is preferably 3 hours, and the initiator is dropwise added for 2-4 hours and 30 minutes;
4. and (3) curing process: and after the dropwise addition is finished, adding 10-20 parts of sodium metabisulfite, curing for 0.5-2.0 hours, preferably 1.0 hour, slowly adding 15-40 parts of liquid alkali when the temperature of the reaction solution is lower than 30 ℃, supplementing water until the total mass of the solution is 1000 parts, and uniformly stirring to obtain a finished dispersant product with the mass fraction of 20%.
The invention has the positive effects that
1. Through Zeta potential measurement, wet-discharged slag and phosphorous slag are negatively charged, the surfaces of the wet-discharged slag and the phosphorous slag can be adsorbed by adopting a cationic polymer, and then the wet-discharged slag and the phosphorous slag are dispersed by utilizing electrostatic repulsion and steric hindrance. The cationic group of the cationic polymer is compounded by adopting quaternary amine, quaternary phosphine, sulfonic group, phosphoric group and amide group, and is different from the single amide and DAC compound anchoring effect of common cationic polymer-polyacrylamide;
2. the invention adopts a low-concentration synthesis method in the process, and the concentration of the finished product is 20 percent to ensure the low molecular weight distribution; in the synthesis process, a strong reducing agent sodium formaldehyde sulfoxylate is adopted, and an oxidation-reduction system and a single initiation system are constructed with the oxidant of ammonium persulfate and hydrogen peroxide to ensure that the process can react at normal temperature or low temperature, so that the process is different from the existing heating process of common cationic polymer-sodium polyacrylate, and has the advantages of simple process, short working hour and simple and convenient production;
3. in the invention, excessive reducing agents of sodium hypophosphite monohydrate and sodium metabisulfite are used to assist sodium formaldehyde sulfoxylate to construct an initiation system, and the surplus amount is equivalent to a part of inorganic dispersant to assist the high molecular cationic polymer of a finished product to jointly act on the surface of particles;
4. the dispersant is used for wet grinding of the wet-discharging mineral admixture, is liquid at normal temperature, and has good homogeneity and small mixing amount;
5. the invention is aimed at industrial waste residue with the moisture content of 40-60% of wet-discharge mineral admixture, the ton dosage is 0.5-2.0 kg, the industrial waste residue is dripped into the front section of the ball mill according to the measurement, the operation is simple, the grinding efficiency can be improved, the viscosity can be reduced, the fluidity of the superfine admixture after wet grinding can be obviously improved, and the moisture content of the finished product of the superfine admixture after wet grinding can be reduced.
Detailed Description
The technical solution of the present invention is further clearly and completely described below with reference to the following examples.
Example 1:
the dispersing agent is formed by polymerizing the components in parts by mass, and the total mass is 1000.
1. Feeding for the first time: adding 7.5 parts by mass of sodium methallyl sulfonate, 11 parts by mass of sodium hypophosphite monohydrate and 350 parts by mass of water into a reaction kettle, continuously stirring until the stirring solution has no obvious blocky or conglobate materials, and completely homogenizing;
2. temperature control: measuring the temperature in the kettle, controlling the temperature at 10 ℃, and adding 11 parts of hydrogen peroxide and 4.2 parts of ammonium persulfate at one time after the temperature is stable, wherein the mass fraction of the hydrogen peroxide is 27.5%;
3. and (3) feeding for the second time: after adding hydrogen peroxide and ammonium persulfate for 5min, sequentially dropwise adding an initiator and a small monomer solution, and after adding the initiator, dropwise adding the small monomer solution within 10min, wherein the dropwise adding time of the small monomer solution is 2 hours, and the dropwise adding time of the initiator is 2.5 hours; the initiator consists of 2.8 parts of sodium formaldehyde sulfoxylate and 220 parts of water, and the small monomer solution consists of 40 parts of DMC, 20 parts of DAC, 27.5 parts of THPS, 27.5 parts of VBTBPC cationic small monomer, 55 parts of acrylamide and 125 parts of water;
4. and (3) curing process: and after the dropwise addition is finished, adding 10.8 parts of sodium metabisulfite, curing for 0.7 hour, slowly adding 16 parts of liquid alkali when the temperature of the reaction solution is lower than 30 ℃, supplementing water until the total mass of the solution is 1000 parts, and uniformly stirring to obtain a finished product of the dispersing agent with the mass fraction of 20%.
Example 2
The dispersing agent is formed by polymerizing the components in parts by mass, and the total mass is 1000.
1. Feeding for the first time: adding 9.7 parts by mass of sodium methallyl sulfonate, 13.5 parts by mass of sodium hypophosphite monohydrate and 430 parts by mass of water into a reaction kettle, and continuously stirring until the stirring solution has no obvious blocky or agglomerate materials, until the homogenization is complete;
2. temperature control: measuring the temperature in the kettle, controlling the temperature at 18 ℃, and adding 13.5 parts of hydrogen peroxide and 6.2 parts of ammonium persulfate at one time after the temperature is stable, wherein the mass fraction of the hydrogen peroxide is 27.5%;
3. and (3) feeding for the second time: after adding hydrogen peroxide and ammonium persulfate for 5min, sequentially dropwise adding an initiator and a small monomer solution, and after adding the initiator, dropwise adding the small monomer solution within 10min, wherein the small monomer solution is dropwise added for 3 hours, and the initiator is dropwise added for 3.5 hours; the initiator consists of 3.6 parts of sodium formaldehyde sulfoxylate and 280 parts of water, and the small monomer solution consists of 30 parts of DMC, 15 parts of DAC, 25 parts of THPS, 25 parts of VBTBPC cationic small monomer, 60 parts of acrylamide and 175 parts of water;
4. and (3) curing process: after the dropwise addition is finished, 15.3 parts of sodium metabisulfite is added, the mixture is cured for 1.2 hours, 27 parts of liquid caustic soda is slowly added when the temperature of the reaction solution is lower than 30 ℃, water is supplemented until the total mass of the solution is 1000 parts, and the mixture is uniformly stirred, so that a finished product of the dispersing agent with the mass fraction of 20 percent is obtained
Example 3
The dispersing agent is formed by polymerizing the components in parts by mass, and the total mass is 1000.
1. Feeding for the first time: adding 10.8 parts by mass of sodium methallyl sulfonate, 15.6 parts by mass of sodium hypophosphite monohydrate and 475 parts by mass of water into a reaction kettle, and continuously stirring until a stirring solution has no obvious blocky or agglomerate materials, and completely homogenizing;
2. temperature control: measuring the temperature in the kettle, controlling the temperature at 23 ℃, and adding 15.5 parts of hydrogen peroxide and 7.2 parts of ammonium persulfate at one time after the temperature is stable, wherein the mass fraction of the hydrogen peroxide is 27.5%;
3. and (3) feeding for the second time: after adding hydrogen peroxide and ammonium persulfate for 5min, sequentially dropwise adding an initiator and a small monomer solution, and after adding the initiator, dropwise adding the small monomer solution within 10min, wherein the dropwise adding time of the small monomer solution is 3.8 hours, and the dropwise adding time of the initiator is 4.3 hours; the initiator consists of 4.6 parts of sodium formaldehyde sulfoxylate and 285 parts of water, and the small monomer solution consists of 26 parts of DMC, 13 parts of DAC, 19.5 parts of THPS, 19.5 parts of VBTBPC cationic small monomer, 67.5 parts of acrylamide and 185 parts of water;
4. and (3) curing process: and after the dropwise addition is finished, 18.6 parts of sodium metabisulfite is added, the mixture is cured for 1.8 hours, 36.8 parts of liquid caustic soda is slowly added when the temperature of the reaction solution is lower than 30 ℃, water is supplemented until the total mass of the solution is 1000 parts, and the mixture is uniformly stirred, so that a finished product of the dispersing agent with the mass fraction of 20% is obtained.
Example 4
The dispersing agent is formed by polymerizing the components in parts by mass, and the total mass is 1000.
1. Feeding for the first time: adding 7 parts by mass of sodium methallyl sulfonate, 10 parts by mass of sodium hypophosphite monohydrate and 350 parts by mass of water into a reaction kettle, continuously stirring until a stirring solution has no obvious blocky or agglomerate materials, and completely homogenizing;
2. temperature control: measuring the temperature in the kettle, controlling the temperature to be 5 ℃, and adding 10 parts of hydrogen peroxide and 4 parts of ammonium persulfate at one time after the temperature is stable, wherein the mass fraction of the hydrogen peroxide is 27.5%;
3. and (3) feeding for the second time: after adding hydrogen peroxide and ammonium persulfate for 5min, sequentially dropwise adding an initiator and a small monomer solution, and after adding the initiator, dropwise adding the small monomer solution within 10min, wherein the dropwise adding time of the small monomer solution is 2 hours, and the dropwise adding time of the initiator is 2.5 hours; the initiator consists of 2.0 parts of sodium formaldehyde sulfoxylate and 200 parts of water, and the small monomer solution consists of 40 parts of DMC, 20 parts of DAC, 27.5 parts of THPS, 27.5 parts of VBTBPC cationic small monomer, 55 parts of acrylamide and 125 parts of water;
4. and (3) curing process: and after the dropwise addition is finished, adding 10 parts of sodium metabisulfite, curing for 0.5 hour, slowly adding 15 parts of liquid alkali when the temperature of the reaction solution is lower than 30 ℃, supplementing water until the total mass of the solution is 1000 parts, and uniformly stirring to obtain a finished product of the dispersing agent with the mass fraction of 20%.
Example 5
The dispersing agent is formed by polymerizing the components in parts by mass, and the total mass is 1000.
1. Feeding for the first time: adding 11 parts by mass of sodium methallyl sulfonate, 16 parts by mass of sodium hypophosphite monohydrate and 475 parts by mass of water into a reaction kettle, continuously stirring until a stirring solution has no obvious blocky or agglomerate materials, and completely homogenizing;
2. temperature control: measuring the temperature in the kettle, controlling the temperature at 25 ℃, and adding 16 parts of hydrogen peroxide and 8 parts of ammonium persulfate at one time after the temperature is stable, wherein the mass fraction of the hydrogen peroxide is 27.5%;
3. and (3) feeding for the second time: after adding hydrogen peroxide and ammonium persulfate for 5min, sequentially dropwise adding an initiator and a small monomer solution, and after adding the initiator, dropwise adding the small monomer solution within 10min, wherein the small monomer solution is dropwise added for 4 hours, and the initiator is dropwise added for 4.5 hours; the initiator consists of 5 parts of sodium formaldehyde sulfoxylate and 300 parts of water, and the small monomer solution consists of 26 parts of DMC, 13 parts of DAC, 19.5 parts of THPS, 19.5 parts of VBTBPC cationic small monomer, 67.5 parts of acrylamide and 185 parts of water;
4. and (3) curing process: and after the dropwise addition is finished, adding 20 parts of sodium metabisulfite, curing for 2 hours, slowly adding 40 parts of liquid alkali when the temperature of the reaction solution is lower than 30 ℃, supplementing water until the total mass of the solution is 1000 parts, and uniformly stirring to obtain a dispersant finished product with the mass fraction of 20%.
Results of example testing
The influence of an inorganic dispersant A (configured into a mass fraction of 20%), an organic dispersant B (configured into a mass fraction of 20%) and examples 1-5 commonly used in the market on the fineness, the final water precipitation rate and the viscosity of the slag slurry admixture after wet grinding is respectively examined by adopting a slurry viscometer and a 500ml measuring cylinder standing and ageing method.
TABLE 1 final water-separating out rate and viscosity of slag slurry admixture
| Numbering | Water content (%) | Kind and amount of dispersant | Fineness (m)2/kg) | Viscosity(s) | Water analysis rate (%) |
| 1 | 60 | A / 3‰ | 645 | 27.8 | 10.8 |
| 2 | 50 | B / 1.5‰ | 722 | 15.2 | 11.0 |
| 3 | 45 | Example 1/1.0 ‰ | 806 | 8.8 | 5.0 |
| 4 | 45 | Example 2/1.0 ‰ | 811 | 8.0 | 4.8 |
| 5 | 40 | Example 3/1.5 ‰ | 824 | 8.5 | 4.6 |
| 6 | 40 | Example 4/1.5 ‰ | 858 | 7.8 | 4.8 |
| 7 | 40 | Example 5/2.0 ‰ | 917 | 7.5 | 4.4 |
According to the data in the table, the consumption of the inorganic dispersant A commonly used in the market is large, the water content of the slurry cannot be effectively reduced, the consumption of the organic dispersant B is relatively small, the water content is slightly controlled, and the water precipitation rate is large; and both have relatively high viscosities. With the dispersants prepared in examples 1 to 5, the incorporation was significantly reduced and the fineness was significantly improved, with the fineness tending to increase with increasing incorporation and the viscosity and the water-release rate decreasing synchronously. The reason for this is that the dispersant prepared in the patent performs targeted multi-point adsorption on slag, and fully exerts repulsive forces such as solvating film acting force and electric double layer electrostatic acting force.
All of the features disclosed in this specification, or all of the formulations and amounts disclosed, may be combined in any combination, except features and/or formulations, amounts, etc. that are mutually exclusive. Any feature disclosed in this specification (including any accompanying claims and abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The above description is only a non-limiting embodiment of the invention, and many embodiments can be derived, and those skilled in the art can make several modifications and improvements without departing from the inventive concept and without making creative efforts, which all belong to the protection scope of the present invention.
Claims (4)
1. A preparation method of a low-molecular-weight cationic polymer dispersant for wet grinding is characterized by comprising the following steps: the method comprises the following steps:
(1) feeding materials for the first time: adding 7-11 parts by mass of sodium methallyl sulfonate, 10-16 parts by mass of sodium hypophosphite monohydrate and 500 parts by mass of 300-one sodium hypophosphite into a reaction kettle, and continuously stirring until a stirring solution has no obvious blocky or agglomerate materials, until the stirring solution is completely homogenized;
(2) and temperature control: measuring the temperature in the kettle, controlling the temperature to be 5-25 ℃, and adding 10-16 parts of hydrogen peroxide and 4-8 parts of ammonium persulfate at one time after the temperature is stable, wherein the mass fraction of the hydrogen peroxide is 27.5%;
(3) and feeding for the second time: after adding hydrogen peroxide and ammonium persulfate for 5 minutes, sequentially dropwise adding an initiator and a small monomer solution, and after adding the initiator, dropwise adding the small monomer solution within 10 minutes, wherein the small monomer solution is dropwise added for 2-4 hours, and the initiator is dropwise added for 30 minutes within 2-4 hours;
(4) and curing process: after the dropwise addition is finished, adding 10-20 parts of sodium metabisulfite, curing for 0.5-2.0 hours, slowly adding 15-40 parts of liquid alkali when the temperature of the reaction solution is lower than 30 ℃, replenishing water until the total mass of the solution is 1000 parts, and uniformly stirring to obtain a dispersant finished product with the mass fraction of 20%;
wherein: the small monomer solution in the step (3) consists of 55-120 parts of cationic small monomer, 50-70 parts of acrylamide and 200 parts of 120-200 parts of water, wherein the cationic small monomer is one or two of a quaternary ammonium salt cationic monomer and a quaternary phosphonium salt cationic monomer, the quaternary ammonium salt cationic monomer is diallyl quaternary ammonium salt, acrylamide alkyl quaternary ammonium salt and acrylamide alkyl quaternary ammonium salt, and the acrylamide alkyl quaternary ammonium salt is one or two of methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acryloyloxyethyl trimethyl ammonium chloride (DAC); the quaternary phosphonium salt cationic monomer is one or a combination of two of tetrakis (hydroxymethyl) phosphonium sulfate (THPS) and p-vinylbenzyl tributyl phosphonium chloride (VBTBPC).
2. The method for preparing a low molecular weight cationic polymer dispersant for wet milling according to claim 1, characterized in that: in the method, the initiator in the step (3) consists of 2.0-5.0 parts of sodium formaldehyde sulfoxylate and 200-300 parts of water.
3. The method for preparing a low molecular weight cationic polymer dispersant for wet milling according to claim 1, characterized in that: the mass ratio of methacryloyloxyethyl trimethyl ammonium chloride (DMC) to acryloyloxyethyl trimethyl ammonium chloride (DAC) in the method is 2: 1; the mass ratio of tetrakis (hydroxymethyl) phosphonium sulfate (THPS) to p-vinylbenzyl tributyl phosphonium chloride (VBTBPC) is 1: 1.
4. The method for preparing a low molecular weight cationic polymer dispersant for wet milling according to claim 1, characterized in that: the liquid caustic soda is 30-32% of industrial-grade liquid caustic soda.
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