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Non-woven fabric for semipermeable membrane support body

A technology of support and non-woven fabrics, which is applied in the field of non-woven fabrics for semi-permeable membrane supports, can solve the problems of non-woven fabrics such as decreased air permeability, poor fit, and too subjective solutions, so as to prevent the penetration of coating liquid Good performance, simplified processing equipment and process, excellent smoothness and air permeability

Inactive Publication Date: 2018-01-09
HANGZHOU FIRST APPLIED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent also has the following problems: since the semipermeable membrane support material is composed of long fibers with a core-sheath structure, it is easy to produce surface filming during the hot pressing process, resulting in a significant drop in air permeability
In addition, there are the following problems: the uniformity of the non-woven fabric prepared by the spunbond method is poor, and there are many defects in application.
However, this patent also has the following problems: since the spunbonded fibers of the semipermeable membrane support are preferably PET fibers, that is, the surface is PET fibers without low-melting point fibers, the adhesion between the surface fibers of the non-woven fabric after heat-pressing treatment Poor compatibility, easy to fluff and form defects
However, this patent also has the following problems: since the semipermeable membrane support is composed of a coated surface and a non-coated surface, the preparation process is more complicated, and the operation in the subsequent hot pressing process is also more complicated
However, the patent also has the following problems: the solution to the problem of curling of the support after coating the polysulfone solution mentioned in the patent is too subjective, and does not give a clear understanding of the impact of the degree of curling of the support on subsequent processing Definition and Boundaries
At the same time, the patent also has the following problems: since the semipermeable membrane support is composed of two non-woven fabrics with different stretch ratios, the preparation process is also relatively complicated, which is not conducive to cost reduction for enterprises
However, this patent also has the following problems: in order to realize the state that most of the adhesive fibers for non-woven fabrics are melted on the surface layer and the inner layer is semi-fused, the hot pressing process used may cause the surface of the sample to be filmed and cause The air permeability of non-woven fabrics is greatly reduced
However, this patent also has the following problems: since the semipermeable membrane needs to be immersed in water for a long time, the existence of pulp fibers will produce mold, thereby polluting the water body
[0009] In addition, in the above-mentioned patents, "breathability" is used to characterize the filtration performance of non-woven fabrics for semi-permeable membrane supports, but non-woven fabrics for semi-permeable membrane supports are used in water treatment. Obviously, this method cannot be true. accurately reflect the actual performance of the sample in use
[0010] In summary, there is currently no non-woven fabric for a semi-permeable membrane support with a simple preparation process, excellent sample uniformity, smoothness, air permeability, and good anti-coating liquid permeability.

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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  • Non-woven fabric for semipermeable membrane support body

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preparation example Construction

[0041] The preparation method of the wet-laid non-woven fabric is first to disperse the main fiber, two kinds of binder fibers and the dispersant in water, and configure it into a uniform slurry with a concentration of 1wt% to 2.5wt% through a beater, after screening, removing impurities After other procedures, transfer to the pulp storage tank. Add the diluted wet strength agent into the slurry tank and stir evenly. Then transport the slurry to the headbox, further dilute the slurry to 0.01wt%-0.05wt%, according to the foam condition of the slurry, add defoamer appropriately, and make paper with a paper machine. In order to improve the uniformity of wet paper, additives such as tackifier and antistatic agent can be added appropriately in the above process.

[0042] As a beater, its main function is to loosen fibers under mechanical, shear, friction, hydraulic impact, etc. in the beating equipment, and finally form a dispersed and well-distributed slurry. In this patent, the...

Embodiment 1

[0072] PET main fiber (fiber diameter 9μm, fiber length 5mm, melting point 255°C, accounting for 65% of the total fiber mass), unstretched PET binder fiber (fiber diameter 12μm, fiber length 5mm, melting point 230°C, accounting for the total fiber 20% of the mass), sheath-core structure polyester binder fiber (fiber diameter 8 μm, fiber length 5mm, melting point 220 ° C, skin / core mass ratio is 50 / 50, accounting for 15% of the total fiber mass), dispersant PEO (4 million molecular weight, accounting for 0.005% of the mass of the aqueous solution), wet strength agent PAE (0.6% of the total fiber mass), and an alcohol defoamer (0.4% of the total fiber mass) are dispersed in water. Paper is made by inclined wire paper machine (inclination angle is 15°, papermaking speed is 25m / min). After drying and hot pressing, the grammage is 80g / m 2 nonwoven samples.

Embodiment 2

[0074]PET main fiber (fiber diameter 9 μm, fiber length 5 mm, melting point 255 ° C, accounting for 80% of the total fiber mass), unstretched PET binder fiber (fiber diameter 12 μm, fiber length 5 mm, melting point 230 ° C, accounting for the total fiber 10% of the mass), sheath-core structure polyester binder fiber (fiber diameter 8 μm, fiber length 5mm, melting point 220 ° C, skin / core mass ratio is 50 / 50, accounting for 10% of the total fiber mass), dispersant PEO (4 million molecular weight, accounting for 0.005% of the mass of the aqueous solution), wet strength agent PAE (0.6% of the total fiber mass), and an alcohol defoamer (0.4% of the total fiber mass) are dispersed in water. Paper is made by inclined wire paper machine (inclination angle is 15°, papermaking speed is 25m / min). After drying and hot pressing, the grammage is 80g / m 2 nonwoven samples.

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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Abstract

The invention discloses non-woven fabric for a semipermeable membrane support body. Main ingredients of the non-woven fabric comprise main fibers, two different types of binder fibers, a dispersant, awet strength agent, a defoaming agent and the like. The non-woven fabric is prepared with a wet non-woven fabric method, firstly, raw materials are dispersed in water, used for preparing paper with pulp through an inclined wire paper machine and then treated through drying, hot pressing and other processes, and a sample is prepared. Compared with like products, the non-woven fabric for the semipermeable membrane support body is prepared with a further simplified process. The uniformity, surface smoothness and water permeability of a product are all improved and the problems of infiltration and leakage of a coating liquid can be solved by means of the provided raw material composition, proportion and processing process.

Description

technical field [0001] The invention belongs to the field of wet-laid non-woven fabrics, and relates to a non-woven fabric for a semipermeable membrane support body. Background technique [0002] In recent years, in the medical field represented by blood filtration, the domestic water field represented by drinking water purification and seawater desalination, and the industrial field represented by wastewater treatment, semi-permeable membranes have received more and more attention as a high-efficiency filter material. more and more attention and application. The semipermeable membrane is composed of cellulose resin, polyester resin, polysulfone resin, polyamide resin, polyimide resin, fluororesin and the like. However, the semipermeable membranes formed by these materials are very thin and have poor mechanical strength, so they cannot be used alone as separation membranes such as ultrafiltration membranes, nanofiltration membranes, and reverse osmosis membranes. Therefore...

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): D21H15/10D21H15/02D21H13/24D21H21/08D21H21/20D21H21/12D21F11/02B01D69/10
Inventor 刘挺李房周光大林建华
Owner HANGZHOU FIRST APPLIED MATERIAL CO LTD
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