CN106563361B - Application of hollow fiber braided tube, hollow fiber desalting membrane and preparation method thereof - Google Patents
Application of hollow fiber braided tube, hollow fiber desalting membrane and preparation method thereofDownload PDFInfo
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及涉及膜分离技术领域，尤其是中空纤维编织管的用途与中空纤维脱盐膜及其制备方法。The invention relates to the technical field of membrane separation, in particular to the use of a hollow fiber braided tube, a hollow fiber desalination membrane and a preparation method thereof.
背景技术Background technique
膜分离技术作为一种新兴的高效分离技术，已经被广泛应用于化工、环保、电子、轻工、纺织、能源工程等领域，国外有关专家甚至把膜分离技术的发展称为“第三次工业革命”。As an emerging high-efficiency separation technology, membrane separation technology has been widely used in chemical industry, environmental protection, electronics, light industry, textile, energy engineering and other fields. revolution".
随着水资源问题的日趋严重，海水淡化和废水处理领域地位日益突出，因此脱盐膜的应用也越来越广泛。膜技术是在离子级水平进行的分离纯化，那么要实现离子级分离除了膜孔径分布范围要窄外，在膜面上就更不能有缺陷即孔穴存在。而目前为止，膜表面或深层的缺陷仍然限制着膜的大规模使用，尽管缺陷数量较少，但其影响却相当严重：膜缺陷的存在不仅会影响膜的分离纯化效果，还会使得膜过滤性能下降，膜使用寿命降低，脱盐效率降低，因此对于膜缺陷现象必须予以高度重视。With the increasingly serious problem of water resources, the status of seawater desalination and wastewater treatment has become increasingly prominent, so the application of desalination membranes has become more and more extensive. Membrane technology is the separation and purification carried out at the ionic level, so in order to realize the ionic level separation, in addition to the narrow pore size distribution of the membrane, there should be no defects on the membrane surface, that is, the existence of pores. Up to now, defects on the membrane surface or in the deep layer still limit the large-scale use of membranes. Although the number of defects is small, their impact is quite serious: the existence of membrane defects will not only affect the separation and purification effect of the membrane, but also make membrane filtration. The performance decreases, the service life of the membrane decreases, and the desalination efficiency decreases, so the phenomenon of membrane defects must be paid great attention.
脱盐膜为克服渗透压必须在较高操作压力下运行，常规中空纤维膜由于耐压性差的问题不适合制备脱盐膜，目前常见脱盐膜均主要以卷式形式，其制备方法为：以无纺布为基衬，在无纺布表面涂覆超滤成膜体系，制备卷式超滤膜，在所得卷式超滤膜表面通过界面聚合制得脱盐功能层，制备卷式脱盐膜。In order to overcome the osmotic pressure, the desalination membrane must operate at a higher operating pressure. The conventional hollow fiber membrane is not suitable for the preparation of the desalination membrane due to the problem of poor pressure resistance. At present, the common desalination membranes are mainly in the form of rolls. The cloth is used as the base lining, and the surface of the non-woven fabric is coated with an ultrafiltration membrane-forming system to prepare a roll-type ultrafiltration membrane.
无纺布是将定向或随机的纤维喷涂制成的，无纺布表面存在着大量无定向纤维，由于无定向纤维的存在，在超滤成膜体系涂覆过程中，易因无定向纤维表面张力等原因，在无定向纤维周围形成超滤成膜体系涂覆不匀、甚至未涂覆的现象，在后续界面功能层制备的过程中将形成缺陷；此外，由于卷式脱盐膜需铺设隔网支撑层制成卷式膜组件，而在高操作压力的影响下，组件内部的隔网易陷入脱盐膜内，导致脱盐膜形成缺陷令脱盐膜整体脱盐率下降The non-woven fabric is made by spraying directional or random fibers. There are a large number of non-directional fibers on the surface of the non-woven fabric. Due to tension and other reasons, the phenomenon of uneven coating or even uncoated ultrafiltration membrane-forming system is formed around the non-directional fibers, and defects will be formed in the subsequent preparation of the interface functional layer; The mesh support layer is made into a roll-type membrane module, and under the influence of high operating pressure, the mesh inside the module is easy to fall into the desalination membrane, which leads to the formation of defects in the desalination membrane and reduces the overall desalination rate of the desalination membrane.
发明内容SUMMARY OF THE INVENTION
本发明所要解决的技术问题在于提供一种中空纤维编织管的用途。The technical problem to be solved by the present invention is to provide the use of a hollow fiber braided tube.
本发明所要解决的另一技术问题在于利用空纤维编织管的用途提供一种中空纤维脱盐膜的制备方法。Another technical problem to be solved by the present invention is to provide a preparation method of a hollow fiber desalination membrane by utilizing the use of the hollow fiber braided tube.
为解决上述技术问题，本发明的技术方案是：For solving the above-mentioned technical problems, the technical scheme of the present invention is:
中空纤维编织管在制备中空纤维脱盐膜方面的用途，所述中空纤维编织管需要经高温烧毛处理去除编织管表面无序纤维。The use of a hollow fiber braided tube in preparing a hollow fiber desalination membrane, the hollow fiber braided tube needs to be subjected to high temperature singeing treatment to remove disordered fibers on the surface of the braided tube.
优选的，上述空纤维编织管的用途，所述编织管的材质为聚对苯二甲酸乙二酯(PET)、聚丙烯腈(PAN)或聚四氟乙烯(PTFE)。Preferably, in the application of the above hollow fiber braided tube, the material of the braided tube is polyethylene terephthalate (PET), polyacrylonitrile (PAN) or polytetrafluoroethylene (PTFE).
一种中空纤维脱盐膜，是采用上述对其表面无序纤维进行去除后的中空纤维编织管作为增强体，并复合超滤功能层和脱盐功能层而形成的编织管增强型中空纤维脱盐膜。A hollow fiber desalination membrane is a braided tube reinforced hollow fiber desalination membrane formed by using the above-mentioned hollow fiber braided tube after removing disordered fibers on its surface as a reinforcing body, and combining an ultrafiltration functional layer and a desalination functional layer.
一种中空纤维脱盐膜的制备方法，具体步骤如下：A preparation method of a hollow fiber desalination membrane, the specific steps are as follows:
(1)以中空纤维编织管为基衬，经高温烧毛处理，去除编织管表面无序纤维后，经表面涂覆聚合物制备中空纤维超滤膜；(1) Taking the hollow fiber braided tube as the base lining, after high temperature singeing treatment, after removing the disordered fibers on the surface of the braided tube, the hollow fiber ultrafiltration membrane is prepared by coating the polymer on the surface;
(2)所得中空纤维超滤膜采用界面聚合法，经多元胺水溶液、多元酰氯有机溶液后，在超滤膜表面形成超薄脱盐层(界面聚合功能层)，得到中空纤维脱盐膜。(2) The obtained hollow fiber ultrafiltration membrane adopts the interfacial polymerization method, and after the polyamine aqueous solution and the polybasic acid chloride organic solution, an ultrathin desalination layer (interface polymerization functional layer) is formed on the surface of the ultrafiltration membrane to obtain the hollow fiber desalination membrane.
优选的，上述中空纤维脱盐膜的制备方法，所述编织管的材质为聚对苯二甲酸乙二酯(PET)、聚丙烯腈(PAN)或聚四氟乙烯(PTFE)。Preferably, in the preparation method of the hollow fiber desalination membrane, the material of the braided tube is polyethylene terephthalate (PET), polyacrylonitrile (PAN) or polytetrafluoroethylene (PTFE).
优选的，上述中空纤维脱盐膜的制备方法，所述聚合物为聚偏氟乙烯、聚氯乙烯、聚醚砜或聚砜。Preferably, in the preparation method of the above hollow fiber desalination membrane, the polymer is polyvinylidene fluoride, polyvinyl chloride, polyethersulfone or polysulfone.
优选的，上述中空纤维脱盐膜的制备方法，所述步骤(2)中界面聚合法是指将处理好的中空纤维超滤膜作为基膜，单面浸入多元胺水溶液中充分接触，沥干后与元酰氯有机溶液进行界面聚合反应，最后进行热处理，用去离子水洗去残余反应物。Preferably, in the above-mentioned preparation method of the hollow fiber desalination membrane, the interfacial polymerization method in the step (2) means that the treated hollow fiber ultrafiltration membrane is used as the base membrane, and one side is immersed in the polyamine aqueous solution to fully contact, and after draining Carry out interfacial polymerization reaction with the organic solution of acid chloride, and finally carry out heat treatment, and wash away the residual reactant with deionized water.
优选的，上述中空纤维脱盐膜的制备方法，所述步骤(2)中多元酰氯有机溶液为均苯三甲酰氯的正己烷溶液。Preferably, in the above-mentioned preparation method of the hollow fiber desalination membrane, in the step (2), the organic solution of the polybasic acid chloride is a n-hexane solution of trimesoyl chloride.
优选的，上述中空纤维脱盐膜的制备方法，所述均苯三甲酰氯的正己烷溶液的质量浓度为0.05－3％。Preferably, in the preparation method of the hollow fiber desalination membrane, the mass concentration of the n-hexane solution of trimesoyl chloride is 0.05-3%.
优选的，上述中空纤维脱盐膜的制备方法，所述步骤(2)中多元胺水溶液为为哌嗪水溶液、二乙烯三胺水溶液或间苯二胺水溶液。Preferably, in the preparation method of the hollow fiber desalination membrane, the polyamine aqueous solution in the step (2) is an aqueous solution of piperazine, an aqueous solution of diethylenetriamine or an aqueous solution of m-phenylenediamine.
优选的，上述中空纤维脱盐膜的制备方法，所述哌嗪水溶液、二乙烯三胺水溶液或间苯二胺水溶液的质量浓度为0.1－5％。Preferably, in the preparation method of the hollow fiber desalination membrane, the mass concentration of the piperazine aqueous solution, the diethylenetriamine aqueous solution or the m-phenylenediamine aqueous solution is 0.1-5%.
本发明的有益效果是：The beneficial effects of the present invention are:
上述空纤维编织管作为制备中空纤维脱盐膜的特定基衬，结构规整，进行烧毛处理后可以更加有效去除其表面茸毛，使其更加平整光滑，在该空纤维编织管上涂覆一层聚合物微孔基膜作为支撑层，利用界面聚合法在聚合物微孔基膜上复合一层致密的超薄脱盐层即可实现制备目的。The above-mentioned hollow fiber braided tube is used as a specific base lining for preparing the hollow fiber desalination membrane, and the structure is regular. The polymer microporous base film is used as a support layer, and a dense ultra-thin desalination layer is compounded on the polymer microporous base film by the interfacial polymerization method to achieve the preparation purpose.
上述中空纤维脱盐膜的制备方法，使用另经过烧毛处理的编织管，其表面更加规整平滑，可在一定程度上降低膜缺陷，并且基膜在编织管表面涂覆更均匀，并与编织管有机结合，有较强的的结合力，使得膜层与编织管有机融合在一起，力学性能大大提高，使得后续制膜工艺中形成的缺陷更少。The preparation method of the above-mentioned hollow fiber desalination membrane uses a braided tube that has undergone singeing treatment, and its surface is more regular and smooth, which can reduce membrane defects to a certain extent. The organic combination has a strong binding force, so that the film layer and the braided tube are organically fused together, and the mechanical properties are greatly improved, so that there are fewer defects formed in the subsequent film making process.
这种低缺陷膜的形成，能够有效提高膜的利用率，降低因膜缺陷导致的额外经济成本，对膜制备及推广膜应用都有一定的积极作用。The formation of such a low-defect film can effectively improve the utilization rate of the film, reduce the additional economic cost caused by the film defect, and have a certain positive effect on the film preparation and promotion of the film application.
由于中空纤维脱盐膜为纤维状，在使用过程中膜丝受高操作压力影响发生自压密，确保运行过程中不会产生缺陷。Since the hollow fiber desalination membrane is fibrous, the membrane filaments are self-compressed under the influence of high operating pressure during use, ensuring that there will be no defects during operation.
附图说明Description of drawings
图1是卷式脱盐膜与中空纤维脱盐膜基衬比对图。Figure 1 is a comparison diagram of a roll-type desalination membrane and a hollow fiber desalination membrane base liner.
图2是卷式脱盐膜组件与中空纤维脱盐膜组件内部膜承压示意图。Figure 2 is a schematic diagram of the internal membrane pressure of the roll-type desalination membrane module and the hollow fiber desalination membrane module.
具体实施方式Detailed ways
下面结合具体实施例对本发明所述技术方案作进一步的说明。The technical solutions of the present invention will be further described below with reference to specific embodiments.
实施例1Example 1
选取经过烧毛工艺处理的编织管(聚对苯二甲酸乙二酯材质)进行涂覆聚偏氟乙烯超滤膜作为基膜，将处理好的基膜单面浸入间苯二胺水溶液(质量浓度2.5％)中充分接触，沥干后与均苯三甲酰氯/正己烷溶液(质量浓度1.5％)进行界面聚合反应，最后进行热处理，用去离子水洗去残余反应物即得到低缺陷中空纤维脱盐膜。待膜进行处理后测试其脱盐率，结果表明选用烧毛工艺处理后编织管作为基衬时，其脱盐率达到99％。The braided tube (made of polyethylene terephthalate) treated by the singeing process is selected to be coated with a polyvinylidene fluoride ultrafiltration membrane as the base membrane, and the treated base membrane is immersed in an aqueous solution of m-phenylenediamine (quality Concentration 2.5%), fully contact with trimesic acid chloride/n-hexane solution (mass concentration 1.5%) after draining, carry out interfacial polymerization reaction, finally heat treatment, wash off residual reactant with deionized water to obtain low-defect hollow fiber desalination membrane. The desalination rate was tested after the membrane was treated. The results showed that the desalination rate reached 99% when the braided tube treated by the singeing process was used as the base lining.
对比实施例1Comparative Example 1
选取常规基层无纺布进行涂覆聚偏氟乙烯超滤膜作为基膜，将处理好的基膜单面浸入间苯二胺水溶液(质量浓度2.5％)中充分接触，沥干后与均苯三甲酰氯/正己烷溶液(质量浓度1.5％)进行界面聚合反应，最后进行热处理，用去离子水洗去残余反应物即得到卷式脱盐膜。待膜进行处理后测试其脱盐率，结果表明选用无纺布作为基衬时，其脱盐率为96％。The conventional base non-woven fabric was selected to be coated with a polyvinylidene fluoride ultrafiltration membrane as the base membrane, and the treated base membrane was immersed in an aqueous solution of m-phenylenediamine (mass concentration 2.5%) on one side and fully contacted. Triformyl chloride/n-hexane solution (mass concentration 1.5%) is subjected to interfacial polymerization reaction, and finally heat treatment is performed, and residual reactants are washed with deionized water to obtain a roll-type desalination membrane. The desalination rate was tested after the membrane was treated. The results showed that the desalination rate was 96% when the non-woven fabric was used as the backing.
对比实施例2Comparative Example 2
选取未进行烧毛工艺的编织管进行涂覆聚偏氟乙烯超滤膜作为基膜，将处理好的基膜单面浸入间苯二胺水溶液(质量浓度2.5％)中充分接触，沥干后与均苯三甲酰氯/正己烷溶液(质量浓度1.5％)进行界面聚合反应，最后进行热处理，用去离子水洗去残余反应物即得到中空纤维脱盐膜。待膜进行处理后测试其脱盐率，结果表明选取未烧毛处理编织管作为基衬时，其脱盐率为97％。The braided tube without singeing process is selected to be coated with a polyvinylidene fluoride ultrafiltration membrane as a base membrane, and the treated base membrane is immersed in an aqueous solution of m-phenylenediamine (mass concentration 2.5%) on one side to fully contact, and after draining Carry out interfacial polymerization reaction with trimesoyl chloride/n-hexane solution (mass concentration 1.5%), finally carry out heat treatment, wash off residual reactant with deionized water to obtain hollow fiber desalination membrane. The desalination rate was tested after the membrane was treated. The results showed that the desalination rate was 97% when the unsinged braided tube was selected as the base liner.
上述3个实施例的其他条件完全相同。The other conditions of the above three embodiments are exactly the same.
由以上所述实施例和对比实施例可以看出，选取经过烧毛工艺处理(即去除由于未缠绕纤维和突起纤维在编织管表面所形成的茸毛的处理方法)的编织管能够有效提高膜丝的脱盐率，能够减少膜的缺陷。It can be seen from the above-mentioned examples and comparative examples that selecting the braided tube processed by the singeing process (that is, the processing method of removing the hairs formed on the surface of the braided tube due to the unwound fibers and protruding fibers) can effectively improve the membrane filaments. The desalination rate can reduce the defects of the membrane.
综上，低缺陷中空纤维脱盐膜制备方法的关键在于基衬的选择。由图1可以看出，通常所用的无纺布结构杂乱无章，作为基层来讲不具备一定的优势，其杂乱无章的结构使得表面粗糙不平，在进行涂覆步骤时就会出现较多的凹凸点，进而形成孔穴即膜缺陷。膜缺陷的形成不仅影响膜的制备还会影响膜的应用，本发明针对常规无纺布基衬的缺点，提出以结构规则的纤维编织管作为基衬，编织管本身制备工艺使得其整体结构较为规则，而用于作为基衬的编织管还经过了烧毛工艺的处理，使得其表面更加平整光滑，凹凸点相对较少，使得其在涂覆及后续工艺制备中形成的缺陷较少。基衬选择后再涂覆特定聚合物基膜，将其上表面浸入水相溶液中一定时间，排除多余的水溶液，然后将此膜浸入有机相中反应一定时间，在空气中干燥，再经热处理和去离子水漂洗得到一种中空纤维脱盐膜。In conclusion, the key to the preparation method of low-defect hollow fiber desalination membrane is the choice of substrate. As can be seen from Figure 1, the structure of the commonly used non-woven fabric is disordered, and it does not have certain advantages as a base layer. Its disordered structure makes the surface rough and uneven, and there will be more bumps during the coating step. Then, pores, ie, film defects, are formed. The formation of film defects not only affects the preparation of the film but also affects the application of the film. In view of the shortcomings of the conventional non-woven base lining, the present invention proposes to use a fiber braided tube with regular structure as the base lining, and the preparation process of the braided tube itself makes its overall structure relatively high. The braided tube used as the base lining has also been treated by the singeing process, which makes its surface smoother and has relatively fewer bumps, so that it has fewer defects formed in the coating and subsequent process preparation. After the base liner is selected, a specific polymer base film is coated, and the upper surface of the film is immersed in the aqueous phase solution for a certain period of time to remove excess aqueous solution, and then the film is immersed in the organic phase for a certain period of time, dried in the air, and then heat-treated Rinse with deionized water to obtain a hollow fiber desalination membrane.
膜缺陷的存在不仅会影响膜的分离纯化效果，还会使得膜过滤性能下降，膜使用寿命降低，脱盐效率降低，而编织管的利用能够有效降低膜缺陷，这种低缺陷膜的形成，能够提高膜的利用率，降低因膜缺陷导致的额外经济成本，对膜制备及推广膜应用都有一定的积极作用。The existence of membrane defects will not only affect the separation and purification effect of the membrane, but also reduce the membrane filtration performance, reduce the service life of the membrane, and reduce the desalination efficiency. The use of braided tubes can effectively reduce membrane defects. The formation of this low-defect membrane can Improving the utilization rate of the membrane and reducing the additional economic cost caused by membrane defects have a certain positive effect on membrane preparation and promotion of membrane application.
实施例2Example 2
选取经过烧毛工艺处理的编织管(聚四氟乙烯)进行涂覆聚醚砜超滤膜作为基膜，将处理好的基膜单面浸入哌嗪水溶液(质量浓度5％)中充分接触，沥干后与均苯三甲酰氯/正己烷溶液(质量浓度3％)进行界面聚合反应，最后进行热处理，用去离子水洗去残余反应物即得到低缺陷中空纤维脱盐膜。待膜进行处理后测试其脱盐率为98％。利用中空纤维脱盐膜制备成中空纤维脱盐膜组件，令组件在10MPa下连续过滤2g/L MgSO4溶液10小时，然后测试组件脱盐率，脱盐率达到96％。The braided tube (polytetrafluoroethylene) treated by the singeing process is selected to be coated with a polyethersulfone ultrafiltration membrane as the base membrane, and the treated base membrane is immersed in a piperazine aqueous solution (mass concentration 5%) on one side to fully contact, After draining, carry out interfacial polymerization reaction with trimesoyl chloride/n-hexane solution (mass concentration 3%), finally carry out heat treatment, wash off residual reactants with deionized water to obtain low-defect hollow fiber desalination membrane. After the membrane was treated, the salt rejection rate was 98%. The hollow fiber desalination membrane module was prepared by using the hollow fiber desalination membrane, and the module was continuously filtered under 10MPa for 2g/L MgSO4 solution for 10 hours, and then the desalination rate of the module was tested, and the desalination rate reached 96%.
对比实施例1Comparative Example 1
选取常规基层无纺布进行涂覆聚醚砜超滤膜作为基膜，将处理好的基膜单面浸入哌嗪水溶液(质量浓度5％)中充分接触，沥干后与均苯三甲酰氯/正己烷溶液(质量浓度3％)进行界面聚合反应，最后进行热处理，用去离子水洗去残余反应物即得到卷式脱盐膜。待膜进行处理后测试其脱盐率为95％。利用卷式脱盐膜制备成卷式脱盐膜组件，令组件在10MPa下连续过滤2g/L MgSO4溶液10小时，然后测试组件脱盐率，其脱盐率达到89％。The conventional base non-woven fabric was selected to be coated with a polyethersulfone ultrafiltration membrane as the base membrane, and the treated base membrane was immersed in a piperazine aqueous solution (mass concentration 5%) on one side and fully contacted. The n-hexane solution (mass concentration of 3%) is subjected to interfacial polymerization, and finally heat treatment is performed, and the residual reactants are washed with deionized water to obtain a roll-type desalination membrane. After the membrane was treated, the salt rejection rate was 95%. A roll-type desalination membrane module was prepared by using a roll-type desalination membrane, and the module was continuously filtered for 10 hours under 10MPa of 2g/L MgSO4 solution, and then the desalination rate of the module was tested, and the desalination rate reached 89%.
由以上所述实施例和对比实施例可以看出，选取经过烧毛工艺处理的编织管制成的中空纤维脱盐膜不仅脱盐率得到提升，在制成中空纤维脱盐膜组件后组件在10MPa高压下连续运行的性能稳定性也较卷式脱盐膜组件得到提高。It can be seen from the above-mentioned examples and comparative examples that the hollow fiber desalination membrane made of the braided tube processed by the singeing process not only improves the desalination rate, but also the hollow fiber desalination membrane module is made into the hollow fiber desalination membrane module. Continuously under high pressure of 10MPa. The performance stability of operation is also improved compared with the roll-type desalination membrane module.
由图2可以看出，卷式膜组件内铺设有隔网，在运行过程中受液体压力影响，隔网被挤压在卷式脱盐膜表面，在长时间的运行下，膜表面的功能层势必会因隔网的挤压遭到破坏，从而影响组件的脱盐性能。本发明制备的中空纤维脱盐膜其截面为圆环形，在运行过程中膜受到由膜四周指向圆心的液体压力，从而在过滤过程中对膜表面功能层形成压密效果，功能层更加致密，保证了中空纤维膜脱盐组件在长时间运行下能够持续保持较高的脱盐能力。It can be seen from Figure 2 that the roll-type membrane module is equipped with a separator, which is affected by the liquid pressure during operation, and the separator is squeezed on the surface of the roll-type desalination membrane. Under long-term operation, the functional layer on the membrane surface It is bound to be damaged due to the extrusion of the separator, thereby affecting the desalination performance of the components. The hollow fiber desalination membrane prepared by the invention has a circular cross-section, and the membrane is subjected to liquid pressure directed from the periphery of the membrane to the center of the circle during the operation, so as to form a compacting effect on the membrane surface functional layer during the filtration process, and the functional layer is more dense. It is ensured that the hollow fiber membrane desalination module can maintain a high desalination capacity continuously under long-term operation.
实施例3Example 3
选取经过烧毛工艺处理的编织管(聚丙烯腈)进行涂覆聚氯乙烯超滤膜作为基膜，将处理好的基膜单面浸入二乙烯三胺水溶液(质量浓度0.1％)中充分接触，沥干后与均苯三甲酰氯/正己烷溶液(质量浓度0.05％)进行界面聚合反应，最后进行热处理，用去离子水洗去残余反应物即得到低缺陷中空纤维脱盐膜。待膜进行处理后测试其脱盐率，结果表明选用烧毛工艺处理后编织管作为基衬时，其脱盐率达到98％。The braided tube (polyacrylonitrile) treated by the singeing process is selected to be coated with a polyvinyl chloride ultrafiltration membrane as the base membrane, and the treated base membrane is immersed in a diethylenetriamine aqueous solution (mass concentration 0.1%) on one side and fully contacted. , after draining, carry out interfacial polymerization reaction with trimesoyl chloride/n-hexane solution (mass concentration 0.05%), finally carry out heat treatment, wash off residual reactants with deionized water to obtain low-defect hollow fiber desalination membrane. The desalination rate was tested after the membrane was treated. The results showed that the desalination rate reached 98% when the braided tube treated by the singeing process was used as the base lining.
上述参照实施例对该中空纤维编织管的用途与中空纤维脱盐膜及其制备方法进行的详细描述，是说明性的而不是限定性的，可按照所限定范围列举出若干个实施例，因此在不脱离本发明总体构思下的变化和修改，应属本发明的保护范围之内。The above-mentioned detailed description of the use of the hollow fiber braided tube, the hollow fiber desalination membrane and the preparation method thereof with reference to the above-mentioned examples is illustrative rather than restrictive, and several examples can be listed according to the limited scope. Changes and modifications without departing from the general concept of the present invention should fall within the protection scope of the present invention.
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