CN115350603A - Polyvinylidene fluoride-based thin-layer composite nanofiltration membrane and preparation method thereof - Google Patents
Polyvinylidene fluoride-based thin-layer composite nanofiltration membrane and preparation method thereofDownload PDFInfo
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Abstract
Description
Translated fromChinese技术领域：Technical field:
本发明属于分离膜技术领域，涉及聚偏氟乙烯基薄层复合纳滤膜及其制备方法。The invention belongs to the technical field of separation membranes, and relates to polyvinylidene fluoride-based thin-layer composite nanofiltration membranes and a preparation method thereof.
背景技术：Background technique:
随着工业化进程和人口增长，水资源短缺和污染已成为人类亟需解决的问题。纳滤膜孔径在0.5～1nm之间，对多价盐和有机小分子(分子量在200～1000Da)具有优异的截留能力；因此，纳滤膜被广泛应用在海水淡化、工业废水、食品和医药等领域。目前，商业化的薄层复合聚酰胺纳滤膜主要是在聚砜或聚醚砜基膜表面通过哌嗪和均苯三甲酰氯之间的界面聚合反应制备。传统聚砜或聚醚砜基膜的表面亲水性差、孔隙率低，很难克服薄层复合聚酰胺纳滤膜固有的溶剂渗透性和溶质选择性之间的“trade-off”效应；另外，聚砜和聚醚砜膜在酯类和酮类有机溶剂中容易发生溶胀，薄层复合聚酰胺纳滤膜耐有机溶剂稳定性差，限制了薄层复合聚酰胺纳滤膜的应用领域.With the process of industrialization and population growth, water shortage and pollution have become urgent problems for human beings. The pore size of the nanofiltration membrane is between 0.5 and 1nm, and it has excellent retention capacity for multivalent salts and small organic molecules (molecular weight is 200 to 1000Da); therefore, the nanofiltration membrane is widely used in seawater desalination, industrial wastewater, food and medicine and other fields. At present, commercialized thin-layer composite polyamide nanofiltration membranes are mainly prepared by the interfacial polymerization reaction between piperazine and trimesoyl chloride on the surface of polysulfone or polyethersulfone-based membranes. Traditional polysulfone or polyethersulfone-based membranes have poor surface hydrophilicity and low porosity, and it is difficult to overcome the inherent "trade-off" effect between solvent permeability and solute selectivity of thin-layer composite polyamide nanofiltration membranes; , polysulfone and polyethersulfone membranes are prone to swelling in ester and ketone organic solvents, and the thin-layer composite polyamide nanofiltration membrane has poor stability in organic solvents, which limits the application fields of thin-layer composite polyamide nanofiltration membranes.
薄的聚酰胺层决定了聚酰胺复合纳滤膜的性能，研究表明，超滤基底的物化性质(孔径大小、孔径分布、表面荷电性和亲疏水性等)对界面聚合过程中分离层的形成具有重要影响。聚偏氟乙烯膜具有机械性能良好、耐溶剂、耐酸碱等优异性能，已被广泛用作超滤、微滤的膜材料，然而，以聚偏氟乙烯超滤膜为基底所制备膜还很少见相关报道，这是因为聚偏氟乙烯膜表面不利于界面聚合过程中水相单体的均匀分散和浸润，而且相转化的聚偏氟乙烯膜孔径比聚砜和聚醚砜的孔径大，从而难以制备连续、无缺陷的聚酰胺选择分离层，限制了聚偏氟乙烯基薄层复合纳滤膜的开发。The thin polyamide layer determines the performance of the polyamide composite nanofiltration membrane. Studies have shown that the physicochemical properties of the ultrafiltration substrate (pore size, pore size distribution, surface charge and hydrophilicity and hydrophobicity, etc.) have a great influence on the formation of the separation layer during interfacial polymerization. have an important impact. Polyvinylidene fluoride membrane has excellent mechanical properties, solvent resistance, acid and alkali resistance, etc., and has been widely used as a membrane material for ultrafiltration and microfiltration. However, the membrane prepared based on polyvinylidene fluoride ultrafiltration membrane is still There are few related reports, this is because the surface of polyvinylidene fluoride membrane is not conducive to the uniform dispersion and infiltration of aqueous phase monomers during interfacial polymerization, and the pore diameter of phase-inverted polyvinylidene fluoride membrane is larger than that of polysulfone and polyethersulfone Therefore, it is difficult to prepare a continuous and defect-free polyamide selective separation layer, which limits the development of polyvinylidene fluoride-based thin-layer composite nanofiltration membranes.
发明内容：Invention content:
针对上述现有技术的不足，本发明的目的在于：提供一种聚(N-羟乙基丙烯酰胺)(PHEAA)表面功能化聚偏氟乙烯共混膜为基底的薄层复合纳滤膜。该方法制得的复合纳滤膜拥有优异的渗透选择性和良好的耐有机溶剂性能。In view of the deficiencies in the prior art above, the object of the present invention is to provide a thin-layer composite nanofiltration membrane based on a poly(N-hydroxyethylacrylamide) (PHEAA) surface-functionalized polyvinylidene fluoride blend membrane. The composite nanofiltration membrane prepared by the method has excellent permeation selectivity and good resistance to organic solvents.
为了实现上述发明目的，本发明提供了一种聚偏氟乙烯基薄层复合纳滤膜。所述聚偏氟乙烯基薄层复合纳滤膜由亲水性聚偏氟乙烯支撑膜和聚酰胺选择分离层组成。In order to achieve the purpose of the above invention, the present invention provides a polyvinylidene fluoride-based thin-layer composite nanofiltration membrane. The polyvinylidene fluoride-based thin-layer composite nanofiltration membrane is composed of a hydrophilic polyvinylidene fluoride support membrane and a polyamide selective separation layer.
本发明第一方面提供一种亲水性聚偏氟乙烯支撑膜。以PHEAA的两亲性聚合物为改性剂，聚偏氟乙烯为成膜材料，通过加入添加剂，利用浸没沉淀相转化法，在无纺布表面制备亲水性聚偏氟乙烯支撑膜。The first aspect of the present invention provides a hydrophilic polyvinylidene fluoride support membrane. The amphiphilic polymer of PHEAA was used as modifier, polyvinylidene fluoride was used as film-forming material, and hydrophilic polyvinylidene fluoride support film was prepared on the surface of non-woven fabric by adding additives and using immersion precipitation phase inversion method.
优选地，所述的亲水性PHEAA的两亲性聚合物中的疏水聚合物结构单元对应的单体为：(甲基)丙烯酸甲酯(MMA)、(甲基)丙烯酸三氟乙酯(TFEMA)、苯乙烯(St)等单体中的一种或几种的混合。Preferably, the monomer corresponding to the hydrophobic polymer structural unit in the amphiphilic polymer of the hydrophilic PHEAA is: methyl (meth)acrylate (MMA), trifluoroethyl (meth)acrylate ( TFEMA), styrene (St) and other monomers or a mixture of several.
优选地，所述的亲水性PHEAA的两亲性聚合物为嵌段共聚物、超支化聚合物、无规共聚物中的一种或几种的混合。所述的PHEAA的两亲性聚合物添加剂的质量为聚偏氟乙烯质量的2～40％。Preferably, the amphiphilic polymer of the hydrophilic PHEAA is one or a mixture of block copolymers, hyperbranched polymers and random copolymers. The mass of the amphiphilic polymer additive of PHEAA is 2-40% of the mass of polyvinylidene fluoride.
优选地，所述的添加剂为聚乙二醇、聚环氧乙烷、聚乙烯吡咯烷酮、氯化锂等中的一种或几种的混合。所述的无纺布为聚酯无纺布、聚丙烯无纺布、聚酰胺无纺布中的一种或几种的混合。Preferably, the additive is one or a combination of polyethylene glycol, polyethylene oxide, polyvinylpyrrolidone, lithium chloride, etc. The non-woven fabric is one or a mixture of polyester non-woven fabrics, polypropylene non-woven fabrics and polyamide non-woven fabrics.
本发明第二方面以第一方面所述的亲水性聚偏氟乙烯支撑膜为基底制备复合纳滤膜。具体步骤如下：The second aspect of the present invention uses the hydrophilic polyvinylidene fluoride support membrane described in the first aspect as a substrate to prepare a composite nanofiltration membrane. Specific steps are as follows:
(1)在亲水性聚偏氟乙烯支撑膜表面涂覆一层水溶性单体的水溶液，接触20～300s，去除支撑膜表面的水溶性单体溶液，(1) Coating a layer of aqueous solution of water-soluble monomer on the surface of the hydrophilic polyvinylidene fluoride support membrane, contacting for 20-300s, removing the water-soluble monomer solution on the surface of the support membrane,
(2)再涂覆一层油溶性单体的有机相溶液，反应20～120s后，去除未反应的有机相溶液，(2) Coat the organic phase solution of one deck oil-soluble monomer again, after reacting for 20～120s, remove the unreacted organic phase solution,
(3)在烘箱50～80℃下处理5～60min。(3) Treat in an oven at 50-80°C for 5-60 minutes.
优选地，所述的水溶性单体为哌嗪、哌嗪衍生物、间苯二胺、均苯二胺、聚乙烯亚胺中的一种或几种的混合。所述的水溶性单体水相溶液的质量百分数为0.05～1.5％。Preferably, the water-soluble monomer is one or a mixture of piperazine, piperazine derivatives, m-phenylenediamine, s-phenylenediamine, and polyethyleneimine. The mass percent of the water-soluble monomer aqueous phase solution is 0.05-1.5%.
优选地，所述的油溶性单体为均苯三甲酰氯、间苯二甲酰氯和对苯二甲酰氯。所述的油溶性单体有机相溶液的质量百分数为0.05～0.2％。所述的有机相溶液的溶剂为酯类溶剂、烃类溶剂或者醚类溶剂中的一种或几种的混合。Preferably, the oil-soluble monomer is trimesoyl chloride, isophthaloyl chloride and terephthaloyl chloride. The mass percent of the oil-soluble monomer organic phase solution is 0.05-0.2%. The solvent of the organic phase solution is one or a mixture of ester solvents, hydrocarbon solvents or ether solvents.
在上述制备方法中，利用浸没沉淀相转化法制备PHEAA表面功能化的聚偏氟乙烯支撑膜。聚偏氟乙烯具有机械性能良好、耐溶剂、耐酸碱等优异性能，已被广泛用作超滤、微滤的膜材料。然后通过界面聚合制备聚偏氟乙烯基聚酰胺复合纳滤膜。在界面聚合过程中，PHEAA链段有益于水相单体哌嗪在膜表面的均匀、高浓度的分散，界面聚合之后制备了高渗透选择性聚酰胺复合纳滤膜。In the above preparation method, the PHEAA surface functionalized polyvinylidene fluoride support membrane was prepared by immersion precipitation phase inversion method. Polyvinylidene fluoride has excellent mechanical properties, solvent resistance, acid and alkali resistance, etc., and has been widely used as a membrane material for ultrafiltration and microfiltration. Then polyvinylidene fluoride-based polyamide composite nanofiltration membrane was prepared by interfacial polymerization. During the interfacial polymerization process, the PHEAA segment is beneficial to the uniform and high-concentration dispersion of the aqueous phase monomer piperazine on the membrane surface. After the interfacial polymerization, a polyamide composite nanofiltration membrane with high permeability selectivity was prepared.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
本发明以PHEAA的两亲性聚合物为改性剂，聚偏氟乙烯为成膜材料，通过加入PHEAA两亲性聚合物改性剂，利用浸没沉淀相转化法，在无纺布表面制备亲水性聚偏氟乙烯支撑膜。改性剂的引入可以调控聚偏氟乙烯支撑膜表面的孔隙率、孔径大小和亲水性。然后，以亲水性聚偏氟乙烯支撑膜为基底制备复合纳滤膜，在界面聚合过程，膜表面的PHEAA链段有益于水相单体哌嗪在膜表面的均匀、高浓度的分散，使得所制备的聚酰胺复合纳滤膜具有更高的交联度。本发明所制备的复合纳滤膜具有优异的渗透选择性和稳定性。本发明的制备方法能够调控聚偏氟乙烯支撑膜表面的孔隙率、孔径大小和亲水性，进一步利用界面聚合条件优化，可以实现聚酰胺复合纳滤膜结构和性能的优化，制备过程可控、技术成熟、成本低廉，极具工业应用前景。In the present invention, the amphiphilic polymer of PHEAA is used as a modifying agent, and polyvinylidene fluoride is used as a film-forming material. By adding the amphiphilic polymer modifying agent of PHEAA, the amphiphilic polymer is prepared on the surface of the non-woven fabric by the immersion precipitation phase inversion method. Waterborne polyvinylidene fluoride support membrane. The introduction of modifiers can regulate the porosity, pore size and hydrophilicity of the polyvinylidene fluoride support membrane surface. Then, a composite nanofiltration membrane is prepared on the basis of a hydrophilic polyvinylidene fluoride support membrane. During the interfacial polymerization process, the PHEAA segment on the membrane surface is beneficial to the uniform and high-concentration dispersion of the aqueous phase monomer piperazine on the membrane surface. The prepared polyamide composite nanofiltration membrane has a higher degree of crosslinking. The composite nanofiltration membrane prepared by the invention has excellent permeation selectivity and stability. The preparation method of the present invention can regulate the porosity, pore size and hydrophilicity of the surface of the polyvinylidene fluoride support membrane, and further utilize the optimization of the interface polymerization conditions to realize the optimization of the structure and performance of the polyamide composite nanofiltration membrane, and the preparation process is controllable , mature technology, low cost, great industrial application prospects.
优化后的复合纳滤膜，水渗透通量高，对二价盐的具有非常高的截留率(Na2SO4：99.2％，MgSO1：99.1％)，这将在水净化、物料特种分离等行业应用前景广阔。The optimized composite nanofiltration membrane has a high water permeation flux and a very high rejection rate for divalent salts (Na2 SO4 : 99.2%, MgSO1 : 99.1%), which will be used in water purification and material separation And other industries have broad application prospects.
附图说明：Description of drawings:
图1为本发明实施例1由嵌段共聚物聚(N-羟乙基丙烯酰胺)(PHEAA)改性的亲水性聚偏氟乙烯支撑膜为基底的纳滤膜的电镜图，标尺为2μm；Fig. 1 is the electron micrograph of the nanofiltration membrane of the substrate by the hydrophilic polyvinylidene fluoride support membrane modified by block copolymer poly(N-hydroxyethylacrylamide) (PHEAA) in Example 1 of the present invention, and the scale is 2μm;
图2为本发明实施例4由超支化PHEAA改性的亲水性聚偏氟乙烯支撑膜为基底的纳滤膜的电镜图，标尺为2μm；Fig. 2 is the electron micrograph of the nanofiltration membrane based on the hydrophilic polyvinylidene fluoride support membrane modified by hyperbranched PHEAA in Example 4 of the present invention, and the scale is 2 μm;
图3为本发明实施例7由无规共聚物PHEAA改性的亲水性聚偏氟乙烯支撑膜为基底的纳滤膜的电镜图，标尺为2μm；Fig. 3 is the electron micrograph of the nanofiltration membrane based on the hydrophilic polyvinylidene fluoride support membrane modified by the random copolymer PHEAA in Example 7 of the present invention, and the scale is 2 μm;
具体实施方式：Detailed ways:
为实现本发明目的，下面将结合具体实施例对本实验详细说明，但本发明并不仅限于以下实施例。In order to achieve the purpose of the present invention, the experiment will be described in detail below in conjunction with specific examples, but the present invention is not limited to the following examples.
本发明采用错流式膜渗透选择性分离性能测试仪，进行膜分离性能测试。膜池有效面积为7.1cm2。整个实验过程中，操作压力为0.6MPa，进料温度保持在25℃，进料液为1000ppm的硫酸钠(Na2SO4)和硫酸镁(MgSO4)溶液。其中，测试前先预压1h，再进行测试。The invention adopts a cross-flow membrane permeation selective separation performance tester to test the membrane separation performance. The effective area of the membrane pool is 7.1cm2 . Throughout the experiment, the operating pressure was 0.6 MPa, the feed temperature was maintained at 25° C., and the feed liquid was 1000 ppm sodium sulfate (Na2 SO4 ) and magnesium sulfate (MgSO4 ) solutions. Among them, pre-press for 1 hour before testing, and then test.
实施例1：Example 1:
聚偏氟乙烯基薄层复合纳滤膜制备方法，包括以下步骤：A method for preparing polyvinylidene fluoride-based thin-layer composite nanofiltration membranes, comprising the following steps:
S1，选用聚(N-羟乙基丙烯酰胺)(PHEAA)功能改性剂，亲水链段为PHEAA，疏水链段为聚(甲基)丙烯酸甲酯(PMMA)，聚合物结构为嵌段共聚物。S1, use poly(N-hydroxyethylacrylamide) (PHEAA) functional modifier, the hydrophilic segment is PHEAA, the hydrophobic segment is polymethyl (meth)acrylate (PMMA), and the polymer structure is block copolymer.
S2，利用PHEAA功能改性剂，通过浸没沉淀相转化法，在无纺布表面制备亲水性聚偏氟乙烯支撑膜，PHEAA的功能改性剂添加剂的质量为聚偏氟乙烯质量分数的10％。S2, using the PHEAA functional modifier, the hydrophilic polyvinylidene fluoride support film was prepared on the surface of the non-woven fabric by the immersion precipitation phase inversion method, and the mass fraction of the functional modifier additive of PHEAA was 10% of the polyvinylidene fluoride mass fraction %.
S3，将1.0wt％哌嗪水溶液倒在制备好的亲水性聚偏氟乙烯支撑膜表面，反应1min，然后去除表面膜表面多余的哌嗪水溶液。接着将0.15wt％均苯三甲酰氯有机相溶液倒入膜表面，反应1min，倒掉多余的有机相溶液，用正己烷冲洗，晾干后放入60℃烘箱中10min。取出后放入水中备用。S3, pouring 1.0 wt% piperazine aqueous solution on the surface of the prepared hydrophilic polyvinylidene fluoride support membrane, reacting for 1 min, and then removing excess piperazine aqueous solution on the surface of the surface membrane. Then pour 0.15wt% trimesoyl chloride organic phase solution into the surface of the membrane, react for 1 min, pour off excess organic phase solution, rinse with n-hexane, dry it and put it in an oven at 60°C for 10 min. Take it out and put it in water for later use.
实施例2-3：Embodiment 2-3:
与实施例1的不同之处在于：在步骤S1 PHEAA功能改性剂中，疏水链段聚合物不同，具体参数如表1所示，其他均与实施例1相同，在此不在赘述。The difference from Example 1 is that in the step S1 PHEAA functional modifier, the hydrophobic segment polymer is different, and the specific parameters are shown in Table 1. Others are the same as in Example 1, and will not be repeated here.
实施例4-6：Embodiment 4-6:
与实施例1的不同之处在于：在步骤S1 PHEAA功能改性剂中，疏水链段聚合物及聚合物结构不同，具体参数如表1所示，其他均与实施例1相同，在此不在赘述。The difference from Example 1 is that in the step S1 PHEAA functional modifier, the hydrophobic segment polymer and the polymer structure are different, and the specific parameters are shown in Table 1, and the others are the same as in Example 1, and are not described here. repeat.
实施例7-9：Embodiment 7-9:
与实施例1的不同之处在于：在步骤S1 PHEAA功能改性剂中，疏水链段聚合物及聚合物结构不同，具体参数如表1所示，其他均与实施例1相同，在此不在赘述。The difference from Example 1 is that in the step S1 PHEAA functional modifier, the hydrophobic segment polymer and the polymer structure are different, and the specific parameters are shown in Table 1, and the others are the same as in Example 1, and are not described here. repeat.
表1为实施例1-9的工艺及性能参数Table 1 is the technique and performance parameter of embodiment 1-9
在界面聚合过程，超滤基膜的物化性质(孔径大小、孔径分布、表面荷电性和亲疏水性等)对界面聚合过程中聚酰胺层的形成具有重要影响。PHEAA功能改性剂的引入会改变基膜的物化性质，而改性剂中亲水链段和疏水链段类型以及聚合物的类型都会对基膜产生很大影响，这也将影响所制备的纳滤膜的性能。During the interfacial polymerization process, the physical and chemical properties of the ultrafiltration base membrane (pore size, pore size distribution, surface charge, hydrophilicity and hydrophobicity, etc.) have an important impact on the formation of the polyamide layer during the interfacial polymerization process. The introduction of PHEAA functional modifier will change the physicochemical properties of the base film, and the types of hydrophilic and hydrophobic segments in the modifier and the type of polymer will have a great impact on the base film, which will also affect the prepared performance of nanofiltration membranes.
聚合物的结构对纳滤膜性能的影响：在浸没沉淀相转化法过程中，嵌段共聚物和无规共聚物更容易偏析到膜表面，使基膜孔径增大，纳滤膜通量也随之增大，而超支化聚合物偏析能力弱，基膜孔径小，纳滤膜通量也随之减小。The effect of polymer structure on the performance of nanofiltration membranes: in the process of submerged precipitation phase inversion method, block copolymers and random copolymers are more likely to segregate to the surface of the membrane, which increases the pore size of the base membrane and the flux of the nanofiltration membrane. The segregation ability of the hyperbranched polymer is weak, the pore size of the base membrane is small, and the flux of the nanofiltration membrane decreases accordingly.
实施例10-14：Examples 10-14:
与实施例1的不同之处在于：在步骤S2亲水性聚偏氟乙烯支撑膜制备过程中，PHEAA的功能改性剂添加剂占聚偏氟乙烯质量分数不同，以及步骤S3界面聚合过程中，水相PIP浓度和油相TMC浓度不同，具体参数如表2所示，其他均与实施例1相同，在此不在赘述。The difference from Example 1 is that: during the preparation of the hydrophilic polyvinylidene fluoride support membrane in step S2, the functional modifier additive of PHEAA accounts for a different mass fraction of polyvinylidene fluoride, and in the interfacial polymerization process of step S3, The concentration of PIP in the water phase is different from that of the TMC in the oil phase, and the specific parameters are shown in Table 2. Others are the same as those in Example 1, and will not be repeated here.
表2为实施例1、实施例10-14的工艺及性能参数Table 2 is the process and performance parameters of embodiment 1, embodiment 10-14
界面聚合过程中，PIP从水相向油相扩散且与油相中TMC迅速反应在支撑膜上形成聚酰层，因此，PIP和TMC浓度的变化对聚酰层的形成产生很大的影响。During interfacial polymerization, PIP diffused from the water phase to the oil phase and quickly reacted with TMC in the oil phase to form a polyamide layer on the support membrane. Therefore, the changes in the concentrations of PIP and TMC had a great impact on the formation of the polyamide layer.
本发明中，PIP或TMC浓度对纳滤膜性能的影响：PIP或TMC的浓度越大，所制备的纳滤膜聚酰胺层更加致密，盐截留率增加和水通量减小。PHEAA改性剂占PVDF质量分数主要是对基膜的影响，当PHEAA改性剂增多的时候，PVDF铸膜液粘度增大，在浸没沉淀相转化法过程中，非溶剂与溶剂的交换速率变慢，容易形成大孔结构，亲水性PVDF支撑膜孔径增大，所制备的纳滤膜聚酰胺层容易产生缺陷，水通量增加和盐截留率减少。In the present invention, the influence of the PIP or TMC concentration on the performance of the nanofiltration membrane: the greater the concentration of PIP or TMC, the denser the polyamide layer of the prepared nanofiltration membrane, the higher the salt rejection rate and the lower the water flux. The mass fraction of PHEAA modifier in PVDF mainly affects the base film. When the PHEAA modifier increases, the viscosity of PVDF casting solution increases, and the exchange rate between non-solvent and solvent changes during the immersion precipitation phase inversion method. Slow, easy to form a macroporous structure, the pore size of the hydrophilic PVDF support membrane increases, the polyamide layer of the prepared nanofiltration membrane is prone to defects, the water flux increases and the salt rejection rate decreases.
实施例15-20：Examples 15-20:
与实施例1的不同之处在于：在步骤S3界面聚合过程中，水相溶液浸泡时间、界面聚合时间、热处理温度和时间不同，具体参数如表3所示，其他均与实施例1相同，在此不在赘述。The difference with Example 1 is: in step S3 interfacial polymerization process, aqueous phase solution immersion time, interfacial polymerization time, heat treatment temperature and time are different, and specific parameters are as shown in table 3, and others are all identical with embodiment 1, I won't go into details here.
表3为实施例1、实施例15-20的工艺及性能参数Table 3 is the process and performance parameters of embodiment 1, embodiment 15-20
本发明中，界面聚合工艺参数对纳滤膜性能的影响：随着水相溶液的浸泡时间以及界面聚合时间的增长，PIP和TMC反应更加充分，有益于提高纳滤膜的分离性能，但反应时间不宜太长；热处理时间和热处理温度对纳滤膜的影响并不是很大。In the present invention, the impact of interface polymerization process parameters on the performance of nanofiltration membrane: along with the immersion time of aqueous phase solution and the growth of interfacial polymerization time, PIP and TMC reaction are more sufficient, are beneficial to improve the separation performance of nanofiltration membrane, but reaction The time should not be too long; the influence of heat treatment time and heat treatment temperature on the nanofiltration membrane is not great.
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