阅读说明：本技术 水处理用流路件 (Flow passage member for water treatment ) 是由 北野宏树 山口晃生 远藤守信 鲁道夫·克鲁斯席尔瓦 于 2018-12-27 设计创作，主要内容包括：提供一种抑制污垢的产生的水处理用流路件。本发明的水处理用流路件(1)由包含合成树脂和纳米碳材料的成型品构成。(Provided is a flow path material for water treatment, which suppresses the occurrence of fouling. The flow path material (1) for water treatment is composed of a molded article comprising a synthetic resin and a nanocarbon material.)

1. A flow passage member for water treatment, which is composed of a molded article comprising a synthetic resin and a nanocarbon material.

2. A flow passage member for water treatment as claimed in claim 1, wherein the nanocarbon material is composed of carbon nanotubes.

3. A water treatment flow path as claimed in claim 1 or 2, wherein the synthetic resin is composed of a thermoplastic resin.

4. A flow path material for water treatment as claimed in claim 3, wherein the thermoplastic resin is composed of polypropylene.

5. A water treatment flow path material according to any one of claims 1 to 4, wherein the nanocarbon material is incorporated in an amount of 1 to 30 parts by mass based on 100 parts by mass of the synthetic resin.

Technical Field

The present invention relates to a flow passage member for water treatment.

Background

Membrane separation apparatuses are used for the purpose of desalination of seawater or salt water, purification of domestic/industrial wastewater, and the like (for example, patent documents 1 to 3). This membrane separation device is provided with: a microfiltration membrane (hereinafter, MF membrane), an ultrafiltration membrane (hereinafter, UF membrane), a nanofiltration membrane (hereinafter, NF membrane), a reverse osmosis membrane (hereinafter, RO membrane), and the like. When raw water such as wastewater is introduced into one side of the treatment membrane, a solvent such as water permeates into the opposite side of the treatment membrane due to a pressure difference between the membranes, and a permeate from which impurities are separated is obtained.

The membrane separation apparatus generally includes a plurality of treatment membranes for the purpose of, for example, improving efficiency of water treatment. These treatment films are laminated with each other via a raw water spacer (spacer) made of resin having a mesh structure.

Disclosure of Invention

The invention aims to provide a flow passage material for water treatment, which can inhibit the generation of dirt.

(means for solving the problems)

The solution for solving the problem is as follows. That is to say that the first and second electrodes,

<1> a flow path material for water treatment, which is composed of a molded article comprising a synthetic resin and a nanocarbon material.

<2> the flow passage member for water treatment as set forth in <1>, wherein the nanocarbon material is formed of carbon nanotubes.

<3> the flow passage material for water treatment according to <1> or <2>, wherein the synthetic resin is composed of a thermoplastic resin.

<4> the flow path material for water treatment as set forth in <3>, wherein the thermoplastic resin is composed of polypropylene.

<5> the flow passage material for water treatment as set forth in any one of <1> to <4>, wherein a blending ratio of the nanocarbon material is 1 to 30 parts by mass with respect to 100 parts by mass of the synthetic resin.

(effect of the invention)

According to the present invention, a flow passage material for water treatment capable of suppressing generation of fouling can be provided.

Drawings

FIG. 1 is a photograph showing the spacer layer in example 1 and comparative example 1.

Fig. 2 is an enlarged photograph and a cross-sectional photograph of the net portion of the spacer layer in example 1 and comparative example 1.

FIG. 3 is a graph showing the results of the dipping test (fluorescence micrograph) in example 1.

Fig. 4 is a graph showing the results of the dipping test (fluorescence micrograph) in comparative example 1.

Fig. 5 is a graph showing the relationship between time and fluorescence intensity analyzed based on the results of the fluorescence microscope image of example 1 and the results of the fluorescence microscope image of comparative example 1.

Fig. 6 is an enlarged photograph and a cross-sectional photograph of the net portion of the spacer layer in example 2 and comparative example 2.

FIG. 7 is a schematic view of a cross-flow filtration type test apparatus.

FIG. 8 is a graph showing the results of the water permeation test (fluorescence micrograph) in example 2.

FIG. 9 is a graph showing the results of the water permeation test (fluorescence micrograph) in example 3.

FIG. 10 is a graph showing the results of the water permeation test (fluorescence micrograph) in example 4.

FIG. 11 is a photograph showing the results of the water permeation test (fluorescence micrograph) in comparative example 2.

Fig. 12 is a graph showing the relationship between time and fluorescence intensity analyzed based on the results of the fluorescence microscope image of example 2 and the results of the fluorescence microscope image of comparative example 2.

Fig. 13 is a graph showing the relationship between time and fluorescence intensity analyzed based on the results of the fluorescence microscope image of example 3 and the fluorescence microscope image of comparative example 2.

Fig. 14 is a graph showing the relationship between time and fluorescence intensity analyzed based on the results of the fluorescence microscope image of example 4 and the fluorescence microscope image of comparative example 2.

FIG. 15 is a graph showing the results of the water permeation test (fluorescence micrograph) in example 5.

FIG. 16 is a photograph showing the results of the water permeation test (fluorescence micrograph) in comparative example 3.

Fig. 17 is a graph showing the relationship between time and fluorescence intensity analyzed based on the results of the fluorescence microscope image of example 5 and the fluorescence microscope image of comparative example 3.

Detailed Description

The flow passage member for water treatment is composed of a molded article obtained by molding a composition containing a synthetic resin and a nanocarbon material into a predetermined shape. The flow passage member for water treatment is used for a membrane separation device provided with a treatment membrane such as an RO membrane. The flow passage member for water treatment is used, for example, as a net-like spacer layer (raw water spacer layer) or the like interposed between a plurality of treatment membranes used in a membrane separation device.

Examples of synthetic resins used for the flow passage material for water treatment include: thermoplastic resins, thermosetting resins, and the like. The synthetic resin is preferably a thermoplastic resin because of its excellent moldability and the ease of uniformly dispersing the nanocarbon material.

Examples of the thermosetting resin include: phenolic resin, epoxy resin, melamine resin, urea resin, and the like.

Examples of the thermoplastic resin include: polyolefin resins such as Polyethylene (PE), polypropylene (PP), and ethylene-propylene copolymers, acrylic resins, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polystyrene resins, acrylonitrile-butadiene-styrene (ABS) resins, modified polyphenylene ethers, polyphenylene sulfides, polyamides, polycarbonates, and polyacetals. The thermoplastic resin may be used alone or in combination of two or more. The thermoplastic resin is preferably a polyolefin resin.

The nanocarbon material is an sp2 carbon-based carbon material, and includes carbon nanotubes, graphene, fullerene, and the like. These may be used alone or in combination of two or more.

The carbon nanotube has a structure in which a graphene sheet is rolled into a cylindrical shape, and has a diameter of several nm to several tens of nm and a length of several tens of to several thousands times the diameter. Carbon nanotubes are classified into single-layered carbon nanotubes, in which graphene sheets are substantially one layer, and multi-layered carbon nanotubes, in which the graphene sheets are two or more layers. As the carbon nanotube, any of a single-walled carbon nanotube and a multi-walled carbon nanotube can be used as long as the object of the present invention is not impaired.

Graphene generally refers to a sheet of sp 2-bonded carbon atoms having a thickness of one atom (single-layer graphene), but a substance in which single-layer graphene is stacked may be used as graphene as long as the object of the present invention is not impaired.

Fullerenes are carbon clusters having a closed shell structure, and usually have an even number of carbon atoms of 60 to 130. Specific examples of the fullerene include: c60, C70, C76, C78, C80, C82, C84, C86, C88, C90, C92, C94, C96, and higher carbon clusters having more carbon than them. As long as the object of the present invention is not impaired, fullerenes having different carbon numbers may be used in combination, or individual fullerenes may be used.

Among the nanocarbon materials, carbon nanotubes are most preferable from the viewpoints of availability, versatility, and the like.

The mixing ratio of the nanocarbon material to the synthetic resin is not particularly limited as long as the object of the present invention is not impaired, and for example, the nanocarbon material is mixed in a ratio of 1 to 30 parts by mass with respect to 100 parts by mass of the synthetic resin. The amount of the nanocarbon material to be blended is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and still more preferably 17.6 parts by mass or less per 100 parts by mass of the synthetic resin, for the purpose of exerting the characteristics of the synthetic resin as the base (base) material and ensuring the fouling resistance.

In the composition used for molding the flow path material for water treatment, various additives such as an ultraviolet screening agent, a coloring agent (pigment or dye), a thickener, a filler, a surfactant, and a plasticizer may be appropriately blended in addition to the above-mentioned synthetic resin and nanocarbon material as long as the object of the present invention is not impaired.

The water treatment flow path material is appropriately molded by a predetermined mold. For example, when the synthetic resin is made of a thermoplastic resin, the water treatment passage member is appropriately injection-molded by a predetermined mold.

It is presumed that the surface of the flow passage member for water treatment has improved hydrophilicity due to the influence of the nanocarbon material by blending a predetermined amount of the nanocarbon material. It is also presumed that by forming a thin film of water molecules on such a surface, various components (for example, Organic components such as proteins, inorganic components such as calcium carbonate, Natural Organic Materials (NOM) such as alginic acid, alginates, humic acids, and humates, and Organic-inorganic composite components) contained in the liquid that comes into contact with the water treatment channel member cannot approach the surface of the water treatment channel member. Such a flow passage member for water treatment is excellent in fouling resistance. Further, the water treatment flow path material has high rigidity and is excellent in sliding properties, antibacterial properties, and the like.