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Semipermeable membrane support body and preparation method thereof

A technology of support and semi-permeable membrane, applied in the field of special paper and non-woven fabrics, can solve the problems of easily leaking fibers, uneven distribution of fibers in the support, and decreased salt rejection rate of semi-permeable membrane, and reduce pinholes and bright spots. Effect

Active Publication Date: 2021-04-09
宁波日新恒力科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Various characteristic parameters of the support, such as air permeability, thickness, gram weight, cohesiveness, permeability, etc., can meet the requirements for the use of semi-permeable membranes, but after the non-woven fabric is coated with polysulfone layer, some needles usually appear. Pores, bright spots and other local defects make the desalination rate of the semi-permeable membrane drop significantly
[0004] Defects such as pinholes and bright spots in the semi-permeable membrane are caused by uneven distribution of support fibers and low-density defects inside. However, it is difficult to avoid the occurrence of low-density defects in the current equipment process. There are patents using double-circle Two-layer non-woven fabrics are copied in the form of nets, stacked nets, etc., but the essence of this process is to make another layer of non-woven fabrics on the finished non-woven fabrics. Low-density defect parts are easy to leak through the fibers and it is difficult to truly cover the defects. Effect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Semipermeable membrane support body and preparation method thereof

Examples

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preparation example Construction

[0028] A preparation method for a semipermeable membrane support, comprising the steps of:

[0029] Step 1. Prepare the upper layer non-woven fabric, the middle layer non-woven fabric and the lower layer non-woven fabric respectively; the upper layer non-woven fabric, the middle layer non-woven fabric and the lower layer non-woven fabric are prepared by wet papermaking, drying and hot pressing . Because the process is completely independent, only the characteristic requirements of a single layer need to be considered, and the characteristics and morphology can be adjusted independently without affecting each other.

[0030] Step 2. Stack the upper release film, the upper non-woven fabric, the middle non-woven fabric, the lower non-woven fabric and the lower release film in order for preheating. The preheating method adopts penetrating infrared heating. The preheating The temperature is 10-20°C lower than the melting point of the bonding fiber; the hot-pressing composite metho...

Embodiment 1

[0039]Mix PET fiber (Teijin TA04N) with a diameter of 7.3 μm and a length of 5 mm (Teijin TA04N), a binder fiber with a diameter of 10.0 μm, a length of 5 mm, and a melting point of 180 ° C (TR07N) in a ratio of 6:4 and uniformly disperse in water to form a concentration of 0.02%. The fiber solution is formed into wet paper through the inclined wire, and dried with a Yankee cylinder with a surface of 110 degrees to obtain an area of ​​25g / m 2 base paper.

[0040] The raw paper is obtained through different hot-pressing processes to obtain the upper layer non-woven fabric, the middle layer non-woven fabric and the lower layer non-woven fabric. The hot-pressing processes are as follows:

[0041] Upper non-woven fabric: The base paper formed by papermaking is continuously introduced into the two-roller hot press machine. The upper roll of the two-roller hot press machine is a steel roll with a temperature of 200°C, the lower roll is a nylon roll, and the line pressure is 100kN / m....

Embodiment 2

[0049] The preparation method of the upper layer / middle layer / lower layer non-woven fabric is consistent with that of Example 1.

[0050] Stack the transparent upper release film, upper non-woven fabric, middle non-woven fabric, lower non-woven fabric, and lower release film for preheating. The preheating temperature is 165°C, and the preheating method is penetrating infrared heating. .

[0051] The upper release film, the upper non-woven fabric, the middle non-woven fabric, the lower non-woven fabric, and the lower release film are laminated under pressure, with a linear speed of 15m / min and a linear pressure of 100kN / m.

[0052] Finally peel off the upper release film and the lower release film.

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Abstract

The invention discloses a semipermeable membrane support body and a preparation method thereof. The support body is formed by hot pressing compounding of an upper-layer non-woven fabric, a middle-layer non-woven fabric and a lower-layer non-woven fabric, wherein the thickness of the upper-layer non-woven fabric is 20-30 [mu]m, the smoothness of the upper surface is 15-30 s, the thickness of the middle-layer non-woven fabric is 30-50 [mu]m, the thickness of the lower-layer non-woven fabric is 20-40 [mu]m, and the smoothness of the lower surface is 10-20 s. The preparation method comprises the following steps: respectively preparing an upper-layer non-woven fabric, a middle-layer non-woven fabric and a lower-layer non-woven fabric; stacking an upper release film, the upper-layer non-woven fabric, the middle-layer non-woven fabric, the lower-layer non-woven fabric and a lower release film in sequence for preheating; pressurizing and compounding the upper release film, the upper-layer non-woven fabric, the middle-layer non-woven fabric, the lower-layer non-woven fabric and the lower release film; and stripping the upper release film and the lower release film. According to the invention, the semipermeable membrane support body is formed by compounding the upper-layer non-woven fabric, the middle-layer non-woven fabric and the lower-layer non-woven fabric through hot pressing, and each layer of non-woven fabric is independently subjected to wet papermaking, drying and hot pressing, so that low-density defect positions of the upper-layer non-woven fabric, the middle-layer non-woven fabric and the lower-layer non-woven fabric have no correlation, the mutual covering effect can be achieved, and the defects of pinholes, bright spots and the like are reduced.

Description

technical field [0001] The invention relates to the technical field of non-woven fabrics and special papers, in particular to a semipermeable membrane support and a preparation method thereof. Background technique [0002] Semipermeable membranes have been widely used in the removal of impurities in beverage / industrial water, desalination of seawater, removal of bacteria in food, wastewater treatment or biochemistry. [0003] The semipermeable membrane has three layers: a polyamide layer, a polysulfone layer, and a support. Various characteristic parameters of the support, such as air permeability, thickness, gram weight, cohesiveness, permeability, etc., can meet the requirements for the use of semi-permeable membranes, but after the non-woven fabric is coated with polysulfone layer, some needles usually appear. Pores, bright spots and other local defects make the desalination rate of the semi-permeable membrane drop significantly. [0004] Defects such as pinholes and br...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): B01D65/00
CPCB01D65/00Y02A20/131
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司
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