阅读说明：本技术 一种两性均相混床用强碱性阴离子交换树脂及其制备方法 (Strongly basic anion exchange resin for amphoteric homogeneous mixed bed and preparation method thereof ) 是由 柳堤 于少晖 刘伟萍 王李锋 叶扬天 鄢恒飞 武永前 刘晓锋 余炎子 于 2021-10-09 设计创作，主要内容包括：本发明公开了一种两性均相混床用强碱性阴离子交换树脂,属于阴离子交换树脂技术领域。同时公开了以下制备方法：(1)交联聚苯乙烯包埋骨架的制备；(2)交联聚苯乙烯包埋骨架氯化及烷基化反应；(3)辐照接枝法制备得到强碱性阴离子交换树脂。本发明利用多通道喷射法提高交联聚苯乙烯包埋骨架得率,缩短氯化反应生产周期,提高产量,进而降低了生产成本。同时能够防止混合后阳阴树脂在使用过程中重新分层,出水水质好,周期制水量大,使得制造和运行成本低,节能降耗,有益于生态环境的保护。(The invention discloses strongly basic anion exchange resin for an amphoteric homogeneous mixed bed, and belongs to the technical field of anion exchange resin. Simultaneously discloses the following preparation method: (1) preparing a cross-linked polystyrene embedding framework; (2) chlorination and alkylation reaction of the crosslinked polystyrene embedding framework; (3) and (3) preparing the strongly basic anion exchange resin by an irradiation grafting method. The invention utilizes a multi-channel injection method to improve the yield of the crosslinked polystyrene embedded skeleton, shorten the production period of chlorination reaction, improve the yield and further reduce the production cost. Meanwhile, the mixed cation and anion resin can be prevented from being layered again in the using process, the effluent quality is good, the periodic water production amount is large, the manufacturing and running cost is low, the energy is saved, the consumption is reduced, and the ecological environment is protected.)

1. A strongly basic anion exchange resin for an amphoteric homogeneous mixed bed is characterized by having the following structure:

wherein the content of the first and second substances,

the P is a crosslinked polystyrene embedding framework;

the R is₁-R₃Is a long carbon chain radical with the general formula of- (CH)₂)_n-CH₃And n is more than or equal to 1.

2. The process for preparing a strongly basic anion exchange resin for an amphoteric homogeneous mixed bed according to claim 1, comprising the steps of:

(1) uniformly mixing the liquid monomer, spraying the mixture into a dispersant aqueous solution, uniformly stirring the mixture again to obtain spherical particles with the average particle size of 0.3-0.6mm, and curing and washing the spherical particles to obtain a crosslinked polystyrene embedding framework with the average particle size of 400-500 mu m;

the liquid monomer comprises the following raw materials in parts by mass:

88 to 92 percent of styrene, divinylbenzene, 0.1 to 0.3 percent of nano-core, 0.05 to 0.2 percent of emulsifier and 0.6 to 1.2 percent of initiator;

(2) expanding the crosslinked polystyrene embedding framework with an alkylating reagent at normal temperature for 1-5 h, then adding zinc chloride or ferric trichloride, and reacting at 30-48 ℃ for 8-18 h; after the reaction is finished, carrying out suction filtration and washing for 3-5 times, and obtaining chlorine balls with the chlorine content of 15% -20% after suction drying;

(3) expanding the chlorine spheres by using an expanding agent for 1-2 h, adding trimethylamine or amine containing long carbon chains, putting the chlorine spheres into a 60Co irradiation chamber for pre-irradiation, adjusting the temperature in the irradiation chamber to 30-55 ℃, continuing to react for 5-15 h, and finally washing to obtain the strong-base anion exchange resin with the average particle size of 500-700 mu m.

3. The preparation method of strongly basic anion exchange resin for amphoteric homogeneous mixed bed according to claim 2, wherein the nano core in step (1) comprises one or more of nano silica, nano zirconia, nano titania and nano silver oxide;

the emulsifier comprises one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, carboxylate and quaternary ammonium salt of C12-C18, propylene oxide and ethylene oxide;

the initiator comprises one of lauroyl peroxide, benzoyl peroxide, cumene hydroperoxide, tert-butyl hydroperoxide, di-tert-butyl peroxide, dicumyl peroxide, potassium persulfate, sodium persulfate, ammonium persulfate azobisisobutyronitrile and azobisisoheptonitrile;

the dispersant aqueous solution comprises the following raw materials in percentage by mass: 1.5-3% of gelatin, 0.5-1.5% of hydroxyethyl cellulose, 3-6% of polyvinyl alcohol and the balance of water.

4. The method for preparing the strongly basic anion exchange resin for the amphoteric homogeneous mixed bed according to claim 2, wherein the curing treatment in the step (1) is curing at 75 ± 5 ℃ for 6-10 h;

the washing is carried out 3-5 times by using water at 95 ℃.

5. The method for preparing strongly basic anion exchange resin for amphoteric homogeneous mixed bed according to claim 2, wherein the stirring speed in step (1) is 120-180rpm, and the stirring time is 0.5-3 h.

6. The method for preparing the strongly basic anion exchange resin for the amphoteric homogeneous mixed bed according to claim 2, wherein the alkylating reagent in the step (2) is chloromethyl ether, and the addition amount is 300-800% of the mass of the embedding skeleton of the crosslinked polystyrene;

the washing is with methanol or methylal.

7. The method for preparing the strongly basic anion exchange resin for the amphoteric homogeneous mixed bed according to claim 2, wherein the addition amount of the zinc chloride or the ferric chloride in the step (2) is 30-130% of the mass of the embedding skeleton of the crosslinked polystyrene.

8. The method for preparing strongly basic anion exchange resin for amphoteric homogeneous mixed bed according to claim 2, wherein the swelling agent in the step (3) comprises: one or more of methanol, ethanol and methylal, and the addition amount is 100-300%;

the long carbon chain-containing amine comprises one or more of propane diamine, triethylamine and tri-n-butylamine, and the addition amount is 100-250%.

9. The method as claimed in claim 2, wherein the pre-irradiation radiation source activity in step (3) is 20000-.

Technical Field

The invention relates to the technical field of anion exchange resin, in particular to strongly basic anion exchange resin for an amphoteric homogeneous mixed bed and a preparation method thereof.

Background

At present, cation and anion resin needs to be regenerated after the mixed bed for condensate fine treatment fails, the cation and anion resin needs to be thoroughly separated before regeneration, otherwise, the cation and anion resin which is not separated cannot be regenerated, and cross contamination can be caused when the cation and anion resin is not thoroughly separated and regenerated, so that the quality of effluent of the mixed bed and the periodic water production are finally influenced. In order to facilitate resin separation, generally, in synthesis, the particle size of the cationic resin is artificially made coarse and the specific gravity is made large, and the particle size of the anionic resin is artificially made fine and the specific gravity is made small, so that the difference of the sedimentation velocity of the anionic resin and the sedimentation velocity of the cationic resin in water is increased. After separation and regeneration, the materials must be mixed uniformly again for use, but the problem of easy layering exists in the actual mixing and running processes.

At present, most of domestic middle-end and high-end users (namely the quality of the outlet water of the ultrapure water system reaches 18.0M omega cm) originally-produced devices are introduced in a whole set of foreign countries, and supply channels cannot be easily replaced during later maintenance and replacement. Although the mixed bed resin is expensive, the mixed bed resin is disposable in order to improve and ensure the water quality stability of water produced by an ultrapure water system and ensure the high quality product rate of products of a production line, and the market consumption is huge. Therefore, the development of cationic and anionic resins with the same sedimentation velocity in the same medium will have profound effects and great significance for the application of nuclear power industry in the 21 st century, electronic industry supported by digital economy, and biotechnology industry.

Therefore, the technical problem to be solved by the present invention is how to provide an anion exchange resin for amphoteric homogeneous mixed bed, which can distinguish and is superior to the traditional industrial synthesis method of ion exchange resin, and can fundamentally solve the problem that cation and anion resins have the same sedimentation rate in the same medium.

Disclosure of Invention

In view of the above, the invention provides a strong basic anion exchange resin for an amphoteric homogeneous mixed bed, which is synthesized by a nano embedding technology homogeneous wet chemical spraying method and is used for condensate polishing and polishing mixed bed industries, and a specific preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a strongly basic anion exchange resin for an amphoteric homogeneous mixed bed has the following structure:

wherein the content of the first and second substances,

the P is a crosslinked polystyrene embedding framework;

the R is₁-R₃Each independently selected from long carbon chain group with the general formula- (CH)₂)_n-CH₃And n is more than or equal to 1.

Has the advantages that: the principle of the exchange reaction of the hydrogen-oxygen anion resin is as follows:

hydroxide type strongly basic anion resin and water anion such as SO₄ ^2-、CL^-、NO₃ ^-、SiO₃ ^2-The exchange reaction is as follows:

SO₄ ^2-+2ROH→R₂SO₄+2OH^-

CL^-+ROH→RCL+OH^-

NO₃ ^-+ROH→RNO₃+OH^-

SiO₃ ^2-+2ROH→R₂SiO₃+2OH^-

if the product is not a disposable product, the product can be regenerated by using a sodium hydroxide solution and reused, and the reaction is as follows:

R₂SO₄+2OH^-→2ROH+SO₄ ^2-

RCL+OH^-→ROH+CL^-

RNO₃+OH^-→ROH+NO₃ ^-

R₂SiO₃+2OH^-→2ROH+SiO₃ ^2-

the ion exchange and regeneration reactions are reversible, and in order to avoid reversibility in the ion exchange process, the problems that:

first, the amphoteric homogeneous mixed bed technique can mix the hydroxide-type strongly basic anion resin with the anion in the raw water such as SO₄ ^2-、CL^-、NO₃ ^-、SiO₃ ^2-The hydroxide ions generated after the exchange reaction are rapidly removed, and the positive reaction kinetic characteristics are promoted.

Secondly, the amphoteric homogeneous mixed bed technology adopts uniform specific particle size and has rapid dynamic characteristics, and under the high flow rate state, the direct leakage of ions through gaps without exchange is avoided, and the quality of effluent is ensured.

Both of the two properties provided by the inventionThe two resins of the H-type cation resin and the OH-type anion resin of the phase-mixed bed do not have the layering phenomenon in the mixing and running processes, and H desorbed from the cation resin during the desalting⁺And OH desorbed from the anion resin^-The fast in-bed neutralization reaction to form water molecules, macroscopically, if all H in the amphiphilic homogeneous mixed bed is observed⁺And OH^-The reverse reaction rate tends to zero when the water molecules are combined, and the positive reaction can be completed, so that the desalting is thorough, and the effluent water quality is good.

A preparation method of strongly basic anion exchange resin for an amphoteric homogeneous mixed bed is characterized by comprising the following steps:

(1) uniformly mixing the liquid monomer, spraying the mixture into a dispersant aqueous solution, uniformly stirring the mixture again to obtain spherical particles with the average particle size of 0.3-0.6mm, and curing and washing the spherical particles to obtain a crosslinked polystyrene embedding framework with the average particle size of 400-500 mu m;

the liquid monomer comprises the following raw materials in parts by mass:

88 to 92 percent of styrene, divinylbenzene, 0.1 to 0.3 percent of nano-core, 0.05 to 0.2 percent of emulsifier and 0.6 to 1.2 percent of initiator;

(2) expanding the crosslinked polystyrene embedding framework with an alkylating reagent at normal temperature for 1-5 h, then adding zinc chloride or ferric trichloride, and reacting at 30-48 ℃ for 8-18 h; after the reaction is finished, carrying out suction filtration and washing for a plurality of times, and obtaining chlorine balls with the chlorine content of 15-20% after suction drying;

(3) expanding the chlorine spheres by using an expanding agent for 1-2 h, adding trimethylamine or amine containing long carbon chains, putting the chlorine spheres into a 60Co irradiation chamber for pre-irradiation, then reacting for 5-15 h at 30-55 ℃, and finally washing for several times by using pure water to obtain strong-base anion exchange resin with the average particle size of 500-700 mu m;

wherein the synthesized strong-base anion exchange resin has the mass exchange capacity of 2.5-3.5 mmol/g (dry), the volume exchange capacity of 1.0-1.5 mmol/ml and the wet true density of 1.05-1.15 g/ml.

Has the advantages that: the chlorination and amination reactive groups of the anionic resin react as follows:

the invention realizes the homogeneous wet chemical spraying method of the nano embedding technology to synthesize the uniform-particle-size spheres during the polymerization of the crosslinked polystyrene embedding framework, and provides a production method of nano cores and improved polymerized spheres. The present invention is a multi-channel spraying method so that the distribution of particle size becomes controllable and the particle size becomes uniform.

In addition, the invention creatively uses the nano material embedding technology, and the nano material with larger specific gravity is added for embedding when the cross-linked polystyrene embedding framework is polymerized, thereby improving the specific gravity of the anion resin. The invention improves the acid and alkali resistant osmotic pressure and the structural density of the resin by improving the specific gravity of the anion resin, and improves the mechanical strength for abrasion resistance and the deformation strength of the acid and alkali resistant osmotic pressure.

Preferably, the nano-core in the step (1) comprises one or more of nano-silica, nano-zirconia, nano-titania and nano-silver oxide;

the emulsifier comprises one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, carboxylate and quaternary ammonium salt of C12-C18, propylene oxide and ethylene oxide;

the initiator comprises one of lauroyl peroxide, benzoyl peroxide, cumene hydroperoxide, tert-butyl hydroperoxide, di-tert-butyl peroxide, dicumyl peroxide, potassium persulfate, sodium persulfate, ammonium persulfate azobisisobutyronitrile and azobisisoheptonitrile;

the dispersant aqueous solution comprises the following raw materials in percentage by mass: 1.5-3% of gelatin, 0.5-1.5% of hydroxyethyl cellulose, 3-6% of polyvinyl alcohol and the balance of water.

Has the advantages that: by adding the dispersing agents with different proportions, the monomer oil droplets are convenient to gather, adhere and attach again, and the particle size of the particles is influenced.

Preferably, the crosslinked polystyrene embedding framework is a gel-type crosslinked polystyrene embedding framework or a macroporous-type crosslinked polystyrene embedding framework.

Has the advantages that: the specific gravity of the resin is increased by adding the nanometer nuclear substance with higher density.

Preferably, the curing treatment in the step (1) is curing at 75 +/-5 ℃ for 6-10 h;

the washing is carried out 3-5 times by using water at 95 ℃.

Has the advantages that: the curing temperature is relatively mild, so that the framework has better toughness and elasticity, and the subsequent permeation resistance is improved. And the subsequent functionalization is prevented from being influenced by the fact that dirt and oligomer are adhered to the surface of the sphere after the sphere is washed for 3-5 times by water at the temperature of 95 ℃.

Preferably, the stirring speed in the step (1) is 120-180rpm, and the stirring time is 0.5-3 h.

Has the advantages that: the stirring speed is increased, so that the nano-core can be dispersed uniformly, and the embedding effect is facilitated.

Preferably, the alkylating reagent in the step (2) is chloromethyl ether, and the addition amount is 300-800% of the mass of the crosslinked polystyrene embedding framework;

the washing is with methanol or methylal.

Has the advantages that: the use level of chloromethyl ether is increased, the chlorination effect is improved, and the exchange capacity is increased. The spheres are washed by methanol or methylal to make the spheres hydrophilic slowly after chlorination, so as to prevent the spheres from swelling due to sudden dissolution in water, and influence on the strength of the resin and further the service life.

Preferably, the addition amount of the zinc chloride or the ferric chloride in the step (2) is 30-130% of the mass of the crosslinked polystyrene embedding skeleton.

Has the advantages that: the chlorination effect is improved.

Preferably, the swelling agent in step (3) comprises: methylal, and the addition amount is 100-300%;

the long carbon chain-containing amine comprises one or more of propane diamine, triethylamine and tri-n-butylamine, and the addition amount is 100-250%.

Has the advantages that: after methylal expansion, the skeleton expands, the interior of the sphere is cleaned more cleanly, and subsequent amination reaction is facilitated to be carried out more smoothly.

Preferably, the pre-irradiation radiation source activity in the step (3) is 20000-.

Has the advantages that: the reaction rate is improved, functional groups are increased, and the arrangement density is larger and more regular.

According to the technical scheme, compared with the prior art, the invention discloses and provides the strongly basic anion exchange resin for the amphoteric homogeneous mixed bed and the preparation method thereof.

Secondly, the invention utilizes the special functionalization technology to shorten the production period of chlorination reaction, improve the yield, reduce the production cost, and improve the density of the functional groups on the surface of the sphere by amination through the irradiation grafting technology.

Furthermore, the introduction of the nano core and the emulsification technology ensures that the specific gravity of the anion resin is increased and matched with that of the amphoteric homogeneous strong-acid cation exchange resin, so that the sedimentation speeds of the anion resin and the amphoteric homogeneous strong-acid cation exchange resin in the same medium are kept consistent, the mixed anion resin and the amphoteric homogeneous strong-acid cation exchange resin are prevented from being re-layered in the using process, the effluent quality is good, the periodic water production amount is large, the manufacturing and operating cost is low, the energy is saved, the consumption is reduced, and the ecological environment is protected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic flow diagram of a process for the polymerization of strongly basic anionic resin white balls for an amphoteric homogeneous mixed bed in an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of a process for chlorinating and aminating a strongly basic anionic resin in an amphoteric homogeneous mixed bed in an embodiment of the present invention;

FIG. 3 is a schematic diagram of an amphoteric homogeneous mixed bed and a conventional mixed bed using the strongly basic anion exchange resin obtained in example 1 of the present invention;

FIG. 4 is a schematic view of a nano-embedded core emulsified homogeneous particle polymeric sphere in an embodiment of the present invention;

FIG. 5 is a photograph showing the amphoteric homogeneous cation-anion mixed resin, wherein the dark color is cation resin and the light color is anion resin.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical solution of the present invention is further described by the following specific embodiments.

Wherein the detection standard of the particle size of the resin is GB/T5758-2001;

the method for measuring the exchange capacity of the anion exchange resin is GB/T5760-2000.

Example 1

A preparation method of strongly basic anion exchange resin for an amphoteric homogeneous mixed bed is characterized by comprising the following steps:

(1) referring to fig. 1, weighing 88% of styrene, 8% of divinylbenzene, 0.1% of nano-core, 0.05% of emulsifier, 0.6% of initiator and other liquid monomers according to the mass fraction, mixing uniformly according to the proportion, spraying into a dispersant aqueous solution through a spraying device, stirring at a stirring speed of 180rpm and 120-.

Wherein the content of the first and second substances,

the nano-core includes: nano titanium dioxide;

the initiator comprises: potassium persulfate, benzoyl peroxide;

the emulsifier comprises: sodium dodecylbenzenesulfonate, ethylene oxide;

the dispersant aqueous solution comprises the following raw materials in percentage by mass: 2.2% of gelatin, 1.0% of hydroxyethyl cellulose, 4.5% of polyvinyl alcohol and the balance of water;

(2) referring to FIG. 2, in a 1000ml three-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, 100g of gel-type crosslinked polystyrene embedded skeleton having a crosslinking degree of 10% and 600ml of chloromethyl ether were charged, and stirring was started to expand at ordinary temperature for 3.5 hours. After the swelling is finished, 30g of zinc chloride is added into the three-neck flask, the three-neck flask is heated to 42 ℃ by a water bath, and the temperature is kept for 12 h. After the reaction is finished, the mother liquor is pumped out by a vacuum pump, an appropriate amount of methanol is taken for washing for a plurality of times, the chlorine content of the chlorine spheres is measured to be 15.5%, 300ml of methylal is added for expansion for 1h, 200ml of long-chain amine is added, the water bath is used for heating to 40 ℃, the temperature is kept for 15h, after the reaction is finished, the mother liquor is pumped out, the mother liquor is washed by pure water until the pH value is 5-7, and the measured resin mass exchange capacity is 3.20mmol/g (dry), the water content is 41.80%, the volume exchange capacity is 1.32mmol/ml, and the wet density is 1.11 g/ml. The particle size analyzer detects that the average particle size of the particles is 600 mu m.

Example 2

A preparation method of strongly basic anion exchange resin for an amphoteric homogeneous mixed bed is characterized by comprising the following steps:

(1) referring to FIG. 1, weighing 92% styrene, 12% divinylbenzene, 0.3% nano-core, 0.2% emulsifier, 1.2% initiator and other liquid monomers according to the mass fraction, mixing uniformly according to the proportion, spraying into a dispersant aqueous solution through a spraying device, stirring at a stirring speed of 180rpm and 120-.

Wherein

The nano-core includes: nano zirconia;

the initiator comprises: benzoyl peroxide;

the emulsifier comprises: sodium dodecylbenzenesulfonate;

the dispersant aqueous solution comprises the following raw materials in percentage by mass: 3% of gelatin, 1.5% of hydroxyethyl cellulose, 6% of polyvinyl alcohol and the balance of water;

(2) referring to FIG. 2, in a 1000ml three-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, 100g of gel-type crosslinked polystyrene embedded skeleton having a crosslinking degree of 8% and 630ml of chloromethyl ether were charged, and stirring was started to expand at ordinary temperature for 3.5 hours. After the swelling is finished, 30g of zinc chloride is added into the three-neck flask, the three-neck flask is heated to 42 ℃ by a water bath, and the temperature is kept for 12 h. After the reaction is finished, pumping out the mother liquor by using a vacuum pump, washing a proper amount of methanol for a plurality of times, measuring the chlorine content of a chlorine ball to be 17.5%, adding 300ml of methylal for expansion for 1h, adding 200ml of long-chain amine by using an irradiation grafting method, heating to 40 ℃ by using a water bath, preserving the temperature for 18h, pumping out the mother liquor after the reaction is finished, washing by using pure water until the pH value is 5-7, and measuring that the resin mass exchange capacity is 4.0-4.08mmol/g (dry), the water content is 48.30-49.56%, the volume exchange capacity is 1.44-1.45mmol/ml, and the wet true density is 1.10 g/ml. The particle size analyzer detects the average particle size of 625-.

Example 3

A preparation method of strongly basic anion exchange resin for an amphoteric homogeneous mixed bed is characterized by comprising the following steps:

(1) referring to fig. 1, weighing 90% styrene, 10% divinylbenzene, 0.2% nano-core, 0.12% emulsifier, 0.9% initiator and other liquid monomers according to mass fraction, mixing uniformly according to proportion, spraying into dispersant aqueous solution through a spraying device, stirring at a stirring speed of 180rpm and 120-.

Wherein

The nano-core includes: nano silicon dioxide;

the initiator comprises: benzoyl peroxide;

the emulsifier comprises: sodium lauryl sulfate, propylene oxide;

the dispersant aqueous solution comprises the following raw materials in percentage by mass: 1.5% of gelatin, 0.5% of hydroxyethyl cellulose, 3% of polyvinyl alcohol and the balance of water;

(2) referring to FIG. 2, in a 1000ml three-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, 100g of gel-type crosslinked polystyrene embedded skeleton having a crosslinking degree of 9% and 600ml of chloromethyl ether were charged, and stirring was started to expand at ordinary temperature for 4 hours. After the swelling is finished, 30g of zinc chloride is added into the three-neck flask, the three-neck flask is heated to 40 ℃ by a water bath, and the temperature is kept for 15 h. After the reaction is finished, pumping out the mother liquor by using a vacuum pump, washing a proper amount of methanol for a plurality of times, measuring the chlorine content of a chlorine ball to be 17.3%, adding 300ml of methylal to expand for 1.5h, adding 200ml of long-chain amine by using an irradiation grafting method, heating to 40 ℃ by using a water bath, preserving the temperature for 20h, pumping out the mother liquor after the reaction is finished, washing by using pure water until the pH value is 5-7, and measuring that the resin mass exchange capacity is 3.80-3.85mmol/g (dry), the water content is 45.60-45.80%, the volume exchange capacity is 1.46-1.49mmol/ml, and the wet true density is 1.086-1.089 g/ml. The particle size analyzer detects the average particle size of 606-615 mu m.

Example 4

A preparation method of strongly basic anion exchange resin for an amphoteric homogeneous mixed bed is characterized by comprising the following steps:

(1) referring to fig. 1, liquid monomers such as 89% of styrene, 11% of divinylbenzene, 0.15% of nano-core, 0.18% of emulsifier, 1.0% of initiator and the like are weighed according to mass fraction, are uniformly mixed according to a proportion, are sprayed into an aqueous solution with a dispersing agent through a spraying device, are stirred at a stirring speed of 180rpm and 120-.

Wherein the content of the first and second substances,

the nano-core includes: nano silver oxide;

the initiator comprises: benzoyl peroxide;

the emulsifier comprises: sodium dodecylbenzenesulfonate;

the dispersant aqueous solution comprises the following raw materials in percentage by mass: 1.8% of gelatin, 0.8% of hydroxyethyl cellulose, 5.3% of polyvinyl alcohol and the balance of water;

(2) referring to FIG. 2, in a 1000ml three-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, 100g of gel-crosslinked polystyrene embedded skeleton having a crosslinking degree of 12% and 650ml of chloromethyl ether were charged, and stirring was started to expand at ordinary temperature for 4 hours. After the swelling is finished, 30g of zinc chloride is added into the three-neck flask, the three-neck flask is heated to 40 ℃ by a water bath, and the temperature is kept for 20 hours. After the reaction is finished, pumping the mother liquor by using a vacuum pump, washing a proper amount of methanol for a plurality of times, measuring the chlorine content of a chlorine ball to be 14.5%, adding 500ml of methylal to expand for 3h, adding 300ml of long-chain amine by using an irradiation grafting method, heating to 45 ℃ by using a water bath, preserving the temperature for 20h, pumping the mother liquor after the reaction is finished, washing by using pure water until the pH value is 5-7, and measuring that the resin mass exchange capacity is 2.65mmol/g (dry), the water content is 32.60%, the volume exchange capacity is 1.30mmol/ml, and the wet true density is 1.12 g/ml. The particle size analyzer detected the average particle size of 580 μm.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.