WO2021227527A1 - 一种中空纤维膜膜丝的浇铸方法 - Google Patents

一种中空纤维膜膜丝的浇铸方法 Download PDF

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Publication number
WO2021227527A1
WO2021227527A1 PCT/CN2020/140899 CN2020140899W WO2021227527A1 WO 2021227527 A1 WO2021227527 A1 WO 2021227527A1 CN 2020140899 W CN2020140899 W CN 2020140899W WO 2021227527 A1 WO2021227527 A1 WO 2021227527A1
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hollow fiber
fiber membrane
membrane
filaments
hot melt
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PCT/CN2020/140899
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English (en)
French (fr)
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黄凤祥
姚萌
洪昱斌
方富林
蓝伟光
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三达膜科技（厦门）有限公司
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Publication of WO2021227527A1 publication Critical patent/WO2021227527A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B01D63/021—Manufacturing thereof
    • B01D63/022—Encapsulating hollow fibres
    • B01D63/023—Encapsulating materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/08—Hollow fibre membranes

Definitions

  • the invention belongs to the technical field of membrane element processing, and in particular relates to a method for casting hollow fiber membrane filaments.
  • Membrane module is the core of membrane technology.
  • the structure of membrane module plays a decisive role in the membrane separation process.
  • common membrane modules are made of epoxy resin or polyurethane resin to cast hollow fiber membrane filaments and external structural parts.
  • the epoxy resin or polyurethane will penetrate through the membrane holes of the module ports during the casting process, which will block the membrane holes and reduce the effective membrane filtering holes of the module.
  • the existing technology uses epoxy resin or polyurethane for end capping before casting.
  • epoxy resin and polyurethane have good flow properties and long curing time, the end capping effect is poor and the efficiency is low, which is not suitable for mass production.
  • CN103785294A discloses a method for sealing the ends of hollow fiber membrane modules before casting, which uses fast and easy-drying acrylic resin for the end sealing of the hollow fiber membrane components before casting. Because the acrylic resin has a high viscosity, it will not penetrate into the membrane. In the hole, the effective membrane filter hole can be increased, and the curing time of the acrylic resin is fast, which can greatly improve the production efficiency.
  • this technical solution has the following problems: the acrylic resin has a very high hardness after the end-capping and hardening of the film filaments, which will gather all the film filaments together, causing the adhesive to be unable to circulate between the film filaments and the film filaments to form a casting Defect hole.
  • the membrane layer may fall off, which will damage the surface of the membrane filaments and reduce the accuracy of the product.
  • the high-strength inner supporting hollow fiber membrane formed by coating the casting liquid on the braided tube It is more likely to cause damage to the film layer.
  • CN110038442A discloses an end-capping treatment method for inner support hollow fiber membrane filaments before casting.
  • the inner-supporting hollow fiber membrane filaments are subjected to a pre-casting end-capping treatment through the elastic silica gel after curing, and the membrane is treated after the silica gel is dried.
  • the silicone resin has suitable viscosity and fast curing time, it will not penetrate into the membrane pores. It can increase the effective membrane filament filtration hole. After curing, the silicone resin has elasticity, which can easily disperse the membrane filaments during the dispersion process.
  • the effective bonding force between the protective film layer and the braided tube improves the operability and qualification rate of the product.
  • this technical solution has the following problems: after the silica gel is dried, the membrane filaments need to be dispersed, and the end-capping and membrane filament dispersion are completed step by step, and the operation is relatively complicated.
  • the end capping of silica gel usually adopts the method of extrusion coating, and only the end face of the film bundle is capped, which is conducive to the dispersion of the subsequent film filaments, so the capping time is longer.
  • the dipping method is adopted, because the glue has better fluidity, the gap formed between the film filaments due to pressing will gradually shrink due to the loss of silica gel. After the silica gel is cured, the gap will become smaller and it will not be possible to form a circulation channel for the adhesive. The adhesive is passed through, and a piece of silica gel film will be formed on the end face and side wall of the film bundle, and the film filaments cannot be dispersed, so the dipping method cannot be used.
  • the purpose of the present invention is to overcome the defects of the prior art and provide a method for casting hollow fiber membrane filaments.
  • a method for casting hollow fiber membrane filaments including the following steps:
  • the hollow fiber membrane filaments are separated into bundles according to the required number, and disperse the ends of the membrane bundles, and then insert their ends into the liquid hot melt glue at a temperature of 150-200°C for end-sealing, or the ends
  • the part is inserted into the liquid hot melt adhesive with a temperature of 150-200°C, while the membrane filaments are dispersed and end-capped, and there is an appropriate gap between the adjacent hollow fiber membrane filaments, and then the end of the membrane bundle is taken out and inserted
  • the membrane shell is naturally cooled until the hot melt adhesive is solidified to obtain the end-capped hollow fiber membrane filament;
  • the hot melt adhesive is a hot melt adhesive with a melt viscosity of 1000-15000 cps at 170°C;
  • the hot melt adhesive is a hot melt adhesive with a melt viscosity of 3000-8000 cps at 170°C.
  • the time of the capping treatment is 0.005-0.2h.
  • the time of the capping treatment is 0.1h.
  • the natural cooling time is 0.05-0.2h.
  • the natural cooling time is 0.2h.
  • the temperature of the liquid hot melt adhesive is 170° C.
  • the end-capping treatment time is 0.1 h
  • the natural cooling time is 0.2 h.
  • the adhesive is epoxy resin or polyurethane resin.
  • the end-capped hollow fiber membrane filaments together with the membrane shell and the outer structure are centrifuged or statically cast together.
  • the method for fully dispersing the membrane filaments is: contacting the hollow fiber membrane filaments with the bottom of the container containing the hot melt adhesive under pressure to make the hollow fiber membrane filaments
  • the end surface of the hollow fiber membrane is squeezed to be properly dispersed with the adjacent hollow fiber membrane filaments, and the hot melt adhesive adheres to the gap between the hollow fiber membrane filaments and the gap between the membrane holes.
  • Another method for fully dispersing the membrane filaments is: tightening the hollow fiber membrane bundle at a distance of 1-8 cm from the end, and the end is free to disperse.
  • the present invention uses a specific hot melt adhesive for end-capping treatment.
  • the hot melt adhesive is solid at room temperature, and its viscosity gradually decreases as the temperature rises. When the temperature is higher than the melting point, the hot melt adhesive is liquid, and the viscosity is greatly reduced. It has a certain viscosity. When the end of the hollow fiber membrane filament is in contact with it, the hot melt adhesive can quickly adhere to the membrane hole. Then at room temperature, the temperature of the hot melt adhesive gradually decreases and quickly solidifies into a solid state, thereby sealing the membrane hole.
  • the hollow fiber membrane filaments are brought into contact with the bottom of the container containing the hot melt adhesive under pressure, so that the end faces of the hollow fiber membrane filaments are squeezed to disperse appropriately with the adjacent hollow fiber membrane filaments.
  • the hot melt adhesive adheres to the hollow fiber membrane filaments and the gaps between the membrane holes.
  • the hot melt adhesive is rapidly cooled and solidified in the air to become a solid.
  • the gap between the film filaments located on the top of the hot melt adhesive forms a circulation channel for the adhesive.
  • the adhesive can be in the adjacent film filaments. Circulate smoothly between them, thereby reducing the number of casting defect holes, and completing the end capping and film filament dispersion in one step, which greatly improves the efficiency.
  • the heated hot melt adhesive is in a liquid state, has good fluidity, low viscosity, and low hardness, and can easily disperse the inner supporting hollow fiber membrane filament. And in the dispersion process, it effectively protects the bonding force between the film layer and the braided tube to prevent the coating layer on the surface of the film from falling off, thereby improving product operability and qualification rate.
  • the hollow fiber membrane filaments are first arranged into a membrane bundle, and then the membrane bundle is straightened out so that both ends of the membrane bundle are projected at the same point up and down.
  • the two ends of the film bundle are clamped with a fixing device, the two ends are capped, and then the film filaments are dispersed.
  • the fixing device at one end of the membrane bundle is hung on the casting support, and the other end is inserted into the membrane shell for casting.
  • the hot melt adhesive of the present invention is used for end-sealing, both ends of the film bundle are synchronized.
  • the two ends of the film bundle are dipped in hot melt glue and inserted into the film shells respectively.
  • the two ends of the film bundle are in corresponding positions, and the two end faces are naturally projected at the same point. Since the hot melt adhesive has a strong adhesive force after cooling and solidification, the film filaments and the film shell before casting are tightly bonded after the end is sealed. The film shell directly plays the role of clamping and fixing the film bundle. The shell is hung on the casting support, and the film bundle will not fall off, and no fixing device is needed. Therefore, the hot-melt adhesive end capping can save the steps of straightening the film bundle and clamping and fixing the film bundle, which is more efficient and requires less tooling.
  • the hollow fiber membrane membrane filaments are capped before casting through the hot melt adhesive of a specific specification. Because the hot melt adhesive resin has a suitable viscosity, it will not penetrate into the membrane pores, which can increase the effective membrane filament filtration holes, and The hot melt adhesive has a fast curing time and can greatly improve production efficiency.
  • the hot-melt adhesive end-capping process of the present invention completes the end-capping and film filament dispersion in one step, and the film filaments are dispersed at the same time as the end-capping.
  • the operation time is short, the end-capping efficiency is further improved, and it is more suitable for large-scale mass production.
  • the remaining hot melt adhesive of the present invention can be repeatedly heated and used without causing waste.
  • Casting defect holes are counted according to the number of irregularities on the surface of the component after cutting.
  • the number of damage to the surface of the membrane filament is counted according to the number of shedding of the coating layer on the membrane filament surface.
  • This comparative example is an internal support PVDF hollow fiber membrane module of a hollow fiber membrane manufacturer. It has not been capped before casting, and epoxy resin is used as a binder to centrifugally cast and bond the hollow fiber membrane filaments and the outer structure. At the same time, cutting after curing, most of the membrane filament holes at both ends are blocked, the membrane filament filtering effective porosity is 20%, the number of casting defect holes is 0, the number of damage to the surface of the membrane filament is 0, the membrane filament before casting after capping Shear strength test with ABS membrane shell: the maximum force Fm is 850.4N/mm.
  • This comparative example is an internally supported PVDF hollow fiber membrane module of a hollow fiber membrane manufacturer.
  • the end capping treatment is performed with polyacrylic resin before casting.
  • the operation time is 0.5h
  • the curing time is 0.5h
  • epoxy resin is used as a binder.
  • Centrifugal casting and bonding the hollow fiber membrane filament and the outer structure, and cutting after curing, the membrane filament holes at both ends are not blocked, the membrane filament filtration effective porosity is 98%, the casting defect hole number is 12, and the membrane filament surface
  • the number of damages is 100, and the shear strength test of the film filament and ABS film shell before casting after end capping: the maximum force Fm is 5.5N/mm.
  • This comparative example is an internally supported PVDF hollow fiber membrane module of a hollow fiber membrane manufacturer. Before casting, it is terminated with silica gel with a viscosity of 27620cps. The operation time is 1.2h, the curing time is 0.5h, and epoxy resin is used as the adhesive. Bonding agent, centrifugal casting and bonding the hollow fiber membrane filament and the outer structure, and cutting after curing, the membrane filament holes at both ends are not blocked, the membrane filament filtration effective porosity is 99%, and the number of casting defects is 0. The number of damage on the surface of the membrane filament is 0, and the shear strength test of the membrane filament and the ABS membrane shell before casting after capping: the maximum force Fm is 2.0N/mm.
  • the hot melt adhesive is at 170°C Hot melt adhesive with a melt viscosity of
  • Adjacent hollow fiber membrane filaments are properly dispersed, and hot melt adhesive is adhered to the gap between the hollow fiber membrane filaments and the gap between the membrane holes) to ensure that there is an appropriate gap between the adjacent hollow fiber membrane filaments for subsequent follow-up Circulate the adhesive, and then take out the above-mentioned end and insert it into the membrane shell immediately, and let it cool down for 0.2h until the hot melt adhesive solidifies to obtain the end-capped hollow fiber membrane filament; the hot melt adhesive is at 170°C Hot melt adhesive with a melt viscosity of 5500cps;
  • the present invention discloses a method for casting hollow fiber membrane membrane filaments, which includes the following steps: (1) The hollow fiber membrane membrane filaments are divided into bundles according to the required number, and the ends of the hollow fiber membrane filaments are inserted into a liquid with a temperature of 150-200°C.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

一种中空纤维膜膜丝的浇铸方法，包括如下步骤：(1)将中空纤维膜膜丝按要求数量分隔成束，将其端部***温度为150-200℃的呈液态的热熔胶中进行封端处理同时使膜丝充分分散，再将上述端部取出后***膜壳，以自然降温至热熔胶固化，获得封端后的中空纤维膜膜丝；(2)用粘结剂将上述中空纤维膜膜丝的端部连同膜壳与外结构件浇铸在一起；(3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。

Description

一种中空纤维膜膜丝的浇铸方法 技术领域
本发明属于膜元件处理技术领域，具体涉及一种中空纤维膜膜丝的浇铸方法。
背景技术
膜组件是膜技术的核心，膜组件的结构对膜分离过程起着决定性的作用，现在通用的膜组件均为用环氧树脂或者聚氨脂树脂将中空纤维膜膜丝与外结构件浇铸粘结在一起，但由于环氧树脂或聚氨酯在浇铸过程中会透过组件端口的膜丝孔渗入进去，导致堵塞膜孔，使得组件的膜丝过滤有效孔降低。
现有的技术是采用环氧树脂或聚氨酯进行浇铸前封端，但是由于环氧树脂和聚氨酯流动性能较好，固化时间长，所以封端效果差，效率低，不适合大规模生产。
CN103785294A公开了一种中空纤维膜组件浇铸前封端处理方法，其在浇铸前对中空纤维膜组价进行封端处理采用快速易干型丙烯酸树脂进行，由于丙烯酸树脂粘度大，不会渗入到膜孔中，能提高有效膜丝过滤孔，且丙烯酸树脂固化时间快，能很大程度上提高生产效率。但是，该技术方案存在如下问题：丙烯酸树脂在膜丝封端硬化后的硬度很高，会将所有的膜丝集中在一起，导致粘结剂在膜丝与膜丝之间不能流通而形成浇铸缺陷孔。或者在对膜丝分散的过程中使膜层脱落导致膜丝表面损伤而使产品精度降低，尤其对于由铸膜液涂覆到编织管上而形成的高强度的内支撑中空纤维膜来说，更是容易造成膜层脱落的损伤。
CN110038442A公开了一种内支撑中空纤维膜膜丝浇铸前的封端处理方法，其通过固化后具有弹性的硅胶对内支撑中空纤维膜膜丝进行浇铸前封端处理，等硅胶干燥后再对膜丝进行分散，由于硅胶树脂粘度适合，固化时间快，不会渗入到膜孔中，能提高有效膜丝过滤孔，且硅胶树脂固化后具有弹性，能够将膜丝容易的进行分散并在分散过程中有效的保护膜层与编织管间的结合力，提高产品操作性和合格率。但是，该技术方案存在如下问题：硅胶干燥后需对膜丝进行分散，封端和膜丝分散分步完成，操作较为复杂。另外，硅胶封端通常采用挤出涂覆的方式，仅对膜束端面进行封端，有利于后续膜丝分散，所以封端时间较长。若采用蘸涂方式，因胶水流动性能较好，膜丝之间因按压形成的间隙，会因硅胶的流失逐步缩小，待硅胶固化后间隙变小，无法形成粘结剂的流通通道，不足以使粘接剂通过，且膜束端面和侧壁会形成成片的硅 胶膜，无法进行膜丝分散，因此无法采用蘸涂方式。
发明内容
本发明的目的在于克服现有技术缺陷，提供一种中空纤维膜膜丝的浇铸方法。
本发明的技术方案如下：
一种中空纤维膜膜丝的浇铸方法，包括如下步骤：
(1)将中空纤维膜膜丝按要求数量分隔成束，使膜束端部分散再将其端部***温度为150-200℃的呈液态的热熔胶中进行封端，或者将其端部***温度为150-200℃的呈液态的热熔胶中同时膜丝分散和封端，在相邻中空纤维膜膜丝之间具有适当的间隙，再将所述膜束端部取出后***膜壳，自然降温至热熔胶固化，获得封端后的中空纤维膜膜丝；该热熔胶为在170℃时的熔融粘度为1000-15000cps的热熔胶；
(2)用粘结剂将数个所述中空纤维膜膜束的端部连同膜壳与外结构件浇铸在一起；
(3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。
在本发明的一个优选实施方案中，所述热熔胶为在170℃时的熔融粘度为3000-8000cps的热熔胶。
在本发明的一个优选实施方案中，所述封端处理的时间为0.005-0.2h。
进一步优选的，所述封端处理的时间为0.1h。
在本发明的一个优选实施方案中，所述自然降温的时间为0.05-0.2h。
进一步优选的，所述自然降温的时间为0.2h。
在本发明的一个优选实施方案中，所述呈液态的热熔胶的温度为170℃，所述封端处理的时间为0.1h，所述自然降温的时间为0.2h。
在本发明的一个优选实施方案中，所述粘结剂为环氧树脂或聚氨酯树脂。
在本发明的一个优选实施方案中，将所述封端后的中空纤维膜膜丝连同膜壳与外结构件离心或静止浇铸在一起。
在本发明的一个优选实施方案中，所述使膜丝充分分散的方法为：使中空纤维膜膜丝在压力下与盛放所述热熔胶的容器的底部接触，使中空纤维膜膜丝的端面受到挤压而与相邻的中空纤维膜膜丝适当分散，热熔胶黏附于中空纤维膜膜丝之间及其膜孔 之间的间隙。
另一种所述使膜丝充分分散的方法为：将所述中空纤维膜束在距端部1-8cm处束紧，其端部自由分散。
本发明的有益效果是：
1、本发明采用特定的热熔胶进行封端处理，该热熔胶常温时为固体，粘度随温度升高而逐渐降低，当温度高于熔点时，热熔胶为液态，粘度大幅下降并具有一定粘性，采用中空纤维膜膜丝的端部与之接触，热熔胶可快速黏附于膜孔，接着室温条件下，热熔胶温度逐渐降低，快速凝固成为固态，从而封住膜孔。
2、本发明使中空纤维膜膜丝在压力下与盛放所述热熔胶的容器的底部接触，使中空纤维膜膜丝的端面受到挤压而与相邻的中空纤维膜膜丝适当分散，热熔胶黏附于中空纤维膜膜丝之间及其膜孔之间的间隙。待膜丝离开热熔胶后，热熔胶在空气中迅速冷却凝固成为固体，位于热熔胶上部的膜丝间隙形成粘接剂的流通通道，后续浇铸时粘接剂可在相邻膜丝之间顺利流通，从而降低浇铸缺陷孔数量，封端和膜丝分散一步完成，大幅提高效率。
3、本发明中热熔胶封端和膜丝分散时，加热后的热熔胶属于液体状态，流动性好、粘度低、硬度低，能够将内支撑中空纤维膜膜丝容易的进行分散，并在分散过程中有效的保护膜层与编织管间的结合力，避免膜丝表面涂覆层脱落，从而提高产品操作性和合格率。
4、现有技术中，采用硅胶封端时，先将中空纤维膜膜丝整理成膜束，然后理顺膜束，使膜束两端上下投影共点。将膜束的两端用固定装置夹紧，对两端进行封端处理，而后进行膜丝分散。再将膜束一端的固定装置悬挂于浇铸支架上，另一端***膜壳，进行浇铸。采用本发明的热熔胶封端时，膜束两端同步进行，膜束两端蘸涂热熔胶后，分别***膜壳，膜束两端处于对应位置，两个端面自然投影共点。由于热熔胶冷却固化后粘接力强，封端后浇铸前的膜丝与膜壳紧密粘接在一起，膜壳直接起到夹紧固定膜束的作用，可直接将膜束一端的膜壳悬挂于浇铸支架上，而膜束不会脱落，无需固定装置。因此，热熔胶封端可省去理顺膜束和夹紧固定膜束的步骤，效率更高，所需工装更少。
5、本发明通过特定规格的热熔胶对中空纤维膜膜丝进行浇铸前封端处理，由于 该热熔胶树脂粘度适合，不会渗入到膜孔中，能提高有效膜丝过滤孔，且该热熔胶固化时间快，能很大程度上提高生产效率。
6、本发明热熔胶封端处理使封端和膜丝分散一步完成，封端的同时进行膜丝分散，操作时间短，封端效率进一步提高，更加适合大规模批量生产。
7、本发明封端剩余的热熔胶可反复多次加热使用，不会造成浪费。
具体实施方式
以下通过具体实施方式对本发明的技术方案进行进一步的说明和描述。
以下实施例和对比例采用的都是同一中空纤维膜厂家同一型号的PVDF中空纤维膜组件。膜丝过滤有效孔率的测量与计算方法为：
Figure PCTCN2020140899-appb-000001
浇铸缺陷孔按切割后组件表面不平整漏洞的数量统计。
膜丝表面受损数量按膜丝表面涂覆层脱落数量统计。
封端后浇铸前的膜丝与ABS膜壳粘接力参照《GB/T 7124-2008胶粘剂拉伸剪切强度的测定(刚性材料对刚性材料)》。
首先给出未进行封端前处理、采用聚丙烯酸树脂封端处理、采用硅胶封端处理的膜丝过滤有效孔率、浇铸缺陷孔、膜丝表面受损数量、封端后浇铸前的膜丝与ABS膜壳粘接力数据，即对比例1、对比例2和对比例3。
对比例1
本对比例为某中空纤维膜厂家的内支撑PVDF中空纤维膜组件，未进行浇铸前封端处理，使用环氧树脂作为粘结剂，将中空纤维膜膜丝与外结构件离心浇铸粘结在一起，固化后切割，两端膜丝孔大部分被堵住，膜丝过滤有效孔率为20％，浇铸缺陷孔数量0，膜丝表面受损数量为0，封端后浇铸前的膜丝与ABS膜壳剪切强度测试：最大力Fm为850.4N/mm。
对比例2
本对比例为某中空纤维膜厂家的内支撑PVDF中空纤维膜组件，浇铸前用聚丙烯酸树脂进行封端处理，操作时间为0.5h，固化时间为0.5h，使用环氧树脂作为粘结剂，将中空纤维膜膜丝与外结构件离心浇铸粘结在一起，固化后切割，两端膜丝孔未被堵住，膜丝过滤有效孔率为98％，浇铸缺陷孔数量12，膜丝表面受损数量为100，封端后浇铸前的膜丝与ABS膜壳剪切强度测试：最大力Fm为5.5N/mm。
对比例3
本对比例为某中空纤维膜厂家的内支撑PVDF中空纤维膜组件，浇铸前用粘度为的27620cps的硅胶进行封端处理，操作时间为1.2h，固化时间为0.5h，使用环氧树脂作为粘结剂，将中空纤维膜膜丝与外结构件离心浇铸粘结在一起，固化后切割，两端膜丝孔未被堵住，膜丝过滤有效孔率为99％，浇铸缺陷孔数量0，膜丝表面受损数量为0，封端后浇铸前的膜丝与ABS膜壳剪切强度测试：最大力Fm为2.0N/mm。
实施例1-3
(1)将中空纤维膜膜丝(某中空纤维膜厂家的内支撑PVDF中空纤维膜)按要求数量分隔成束后，将其端部***温度为100-250℃的呈液态的热熔胶中进行封端处理0.1h同时使膜丝充分分散(使中空纤维膜膜丝在压力下与盛放所述热熔胶的容器的底部接触，使中空纤维膜膜丝的端面受到挤压而与相邻的中空纤维膜膜丝适当分散，热熔胶黏附于中空纤维膜膜丝之间及其膜孔之间的间隙)，以保证相邻中空纤维膜膜丝之间具有适当的间隙以利后续粘结剂的流通，再将上述端部取出后立即***膜壳，以自然降温0.2h至热熔胶固化，获得封端后的中空纤维膜膜丝；该热熔胶为在170℃时的熔融粘度为5500cps的热熔胶；
(2)用粘结剂将数个上述中空纤维膜膜束的端部连同膜壳与外结构件离心浇铸在一起；
(3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。
Figure PCTCN2020140899-appb-000002
Figure PCTCN2020140899-appb-000003
实施例4-8
(1)将中空纤维膜膜丝(某中空纤维膜厂家的内支撑PVDF中空纤维膜)按要求数量分隔成束后，将其端部***温度为170℃的呈液态的热熔胶中进行封端处理0.1h同时使膜丝充分分散(使中空纤维膜膜丝在压力下与盛放所述热熔胶的容器的底部接触，使中空纤维膜膜丝的端面受到挤压而与相邻的中空纤维膜膜丝适当分散，热熔胶黏附于中空纤维膜膜丝之间及其膜孔之间的间隙)，以保证相邻中空纤维膜膜丝之间具有适当的间隙以利后续粘结剂的流通，再将上述端部取出后立即***膜壳，以自然降温0.2h至热熔胶固化，获得封端后的中空纤维膜膜丝；该热熔胶为在170℃时的熔融粘度为500-25000cps的热熔胶；
(2)用粘结剂将多个上述中空纤维膜膜丝的端部连同膜壳与外结构件离心浇铸在一起；
(3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。
Figure PCTCN2020140899-appb-000004
Figure PCTCN2020140899-appb-000005
实施例9-11
(1)将中空纤维膜膜丝(某中空纤维膜厂家的内支撑PVDF中空纤维膜)按要求数量分隔成束后，将其端部***温度为170℃的呈液态的热熔胶中进行封端处理0.001-0.5h同时使膜丝充分分散(使中空纤维膜膜丝在压力下与盛放所述热熔胶的容器的底部接触，使中空纤维膜膜丝的端面受到挤压而与相邻的中空纤维膜膜丝适当分散，热熔胶黏附于中空纤维膜膜丝之间及其膜孔之间的间隙)，以保证相邻中空纤维膜膜丝之间具有适当的间隙以利后续粘结剂的流通，再将上述端部取出后立即***膜壳，以自然降温0.2h至热熔胶固化，获得封端后的中空纤维膜膜丝；该热熔胶为在170℃时的熔融粘度为5500cps的热熔胶；
(2)用粘结剂将上述中空纤维膜膜丝的端部连同膜壳与外结构件离心浇铸在一起；
(3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。
Figure PCTCN2020140899-appb-000006
Figure PCTCN2020140899-appb-000007
实施例12-14
(1)将中空纤维膜膜丝(某中空纤维膜厂家的内支撑PVDF中空纤维膜)按要求数量分隔成束后，将其端部***温度为170℃的呈液态的热熔胶中进行封端处理0.1h同时使膜丝充分分散(使中空纤维膜膜丝在压力下与盛放所述热熔胶的容器的底部接触，使中空纤维膜膜丝的端面受到挤压而与相邻的中空纤维膜膜丝适当分散，热熔胶黏附于中空纤维膜膜丝之间及其膜孔之间的间隙)，以保证相邻中空纤维膜膜丝之间具有适当的间隙以利后续粘结剂的流通，再将上述端部取出后立即***膜壳，以自然降温0.01-0.3h至热熔胶固化，获得封端后的中空纤维膜膜丝；该热熔胶为在170℃时的熔融粘度为5500cps的热熔胶；
(2)用粘结剂将上述中空纤维膜膜丝的端部连同膜壳与外结构件离心浇铸在一起；
(3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。
Figure PCTCN2020140899-appb-000008
Figure PCTCN2020140899-appb-000009
以上所述，仅为本发明的较佳实施例而已，故不能依此限定本发明实施的范围，即依本发明专利范围及说明书内容所作的等效变化与修饰，皆应仍属本发明涵盖的范围内。
工业实用性
本发明公开了一种中空纤维膜膜丝的浇铸方法，包括如下步骤：(1)将中空纤维膜膜丝按要求数量分隔成束，将其端部***温度为150-200℃的呈液态的热熔胶中进行封端处理同时使膜丝充分分散，再将上述端部取出后***膜壳，以自然降温至热熔胶固化，获得封端后的中空纤维膜膜丝；(2)用粘结剂将上述中空纤维膜膜丝的端部连同膜壳与外结构件浇铸在一起；(3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。本发明通过特定规格的热熔胶对中空纤维膜膜丝进行浇铸前封端处理，由于该热熔胶树脂粘度适合，不会渗入到膜孔中，能提高有效膜丝过滤孔，且该热熔胶固化时间快，能很大程度上提高生产效率,具有工业实用性。

Claims (11)

  1. 一种中空纤维膜膜丝的浇铸方法，其特征在于：包括如下步骤：
    (1)将中空纤维膜膜丝按要求数量分隔成束，使膜丝端部分散再将其端部***温度为150-200℃的呈液态的热熔胶中进行封端，或者将其端部***温度为150-200℃的呈液态的热熔胶中同时膜丝分散和封端，在相邻中空纤维膜膜丝之间具有适当的间隙，再将所述膜束端部取出后***膜壳，自然降温至热熔胶固化，获得封端后的中空纤维膜膜丝；该热熔胶为在170℃时的熔融粘度为1000-15000cps的热熔胶；
    (2)用粘结剂将上述中空纤维膜膜丝的端部连同膜壳与外结构件浇铸在一起；
    (3)待上述粘结剂凝固后，将上述中空纤维膜膜丝的端部切除至露出中空纤维膜膜丝的过滤膜孔，即浇铸完成。
  2. 如权利要求1所述的浇铸方法，其特征在于：所述使膜束分散的方法为：使中空纤维膜膜束在压力下与盛放所述热熔胶的容器的底部接触，使中空纤维膜膜束的端面受到挤压而与相邻的中空纤维膜膜丝分散。
  3. 如权利要求1所述的浇铸方法，其特征在于：所述使膜丝充分分散的方法为：将所述中空纤维膜束在距端部1-8cm处束紧，其端部自由分散。
  4. 如权利要求2或3所述的浇铸方法，其特征在于所述的中空纤维膜束含中空纤维膜丝10-100根。
  5. 如权利要求2或3所述的浇铸方法，其特征在于：所述热熔胶为在170℃时的熔融粘度为3000-8000cps的热熔胶。
  6. 如权利要求1或2或3所述的浇铸方法，其特征在于：所述封端处理的时间为0.005-0.2h。
  7. 如权利要求1所述的浇铸方法，其特征在于：所述封端处理的时间为0.1h。
  8. 如权利要求1所述的浇铸方法，其特征在于：所述降温的时间为0.05-0.2h。
  9. 如权利要求1所述的浇铸方法，其特征在于：所述呈液态的热熔胶的温度为170℃，所述封端处理的时间为0.1h，所述自然降温的时间为0.2h。
  10. 如权利要求1所述的浇铸方法，其特征在于：所述粘结剂为环氧树脂或聚氨酯树脂。
  11. 如权利要求1所述的浇铸方法，其特征在于：将所述封端后的中空纤维膜膜丝连同膜壳与外结构件离心或静止浇铸在一起。
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