JPS6012114B2 - Oil adsorbent in water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater oil adsorbent comprising a substrate impregnated with a polymer latex.

Water pollution caused by wastewater from factories, etc. is increasing as modernization progresses, and damage caused by this is occurring in various places.

In recent years, these measures and regulations have also been strengthened, and wastewater treatment technology has also progressed. Oil contained in wastewater does not mix with water and covers the surface, spoils the beauty of the water surface, has an unpleasant odor, and has a low flash point.
There is also a fire hazard. Corrosive oil also eliminates dissolved oxygen. Methods for treating oil in wastewater include flotation separation, pressure flotation, and filtration/adsorption methods, but all of these methods require large-scale equipment and large operating costs, making them difficult for factories and shops with small amounts of wastewater. Not suitable for wastewater treatment such as The object of the present invention is to provide an inexpensive and disposable oil adsorbent in water as a substitute for such secondary treatment equipment and for pretreatment.

The present inventors focused on the fact that high molecular weight polymers swell or dissolve in specific organic solvents, and investigated a method for adsorbing and removing oil components floating in water using these polymers.

As a result, it has been found that compositions consisting of various substrates impregnated with various polymer latexes are very useful as oil adsorbents in water.

10 to 15 parts by dry weight of one or more polymer latexes per 100 parts by weight of at least one substrate selected from the group consisting of woven fabrics, nonwoven fabrics, longitudinal fibers, and sponge-like foams. Provided is an oil adsorbent in water which is impregnated with a weight part of and then dried. The polymer latex used in the present invention is not particularly limited and any material can be used. Specific examples include styrene-butadiene copolymer (SBR) latex, polybutadiene (BR) latex, acrylonitributadiene copolymer (NBR) latex, polyisoprene (IR
) latex, or resin latex such as polyvinyl acetate latex, vinyl chloride-vinyl acetate copolymer latex, and ethylene-vinyl acetate copolymer latex.

These can be used alone or in combination of two or more. If the oil is polar, use a product with a polar group such as polyvinyl acetate latex, or if the oil is non-polar, use a styrene-butadiene copolymer (S
BR) A material having no polar group such as latex is preferably used. The substrate used in the present invention is not particularly limited as long as it is a fibrous material or a porous material, but it is preferably a material with good water resistance.

Furthermore, from the viewpoint of ease of handling, woven fabrics, non-woven fabrics, cotton-like wires, or sponge-like foams are preferably used. To specifically explain the method for producing the oil adsorbent of the present invention, the surface of the substrate or the binding points of the fibers is impregnated with one or more types of polymer latex, appropriately squeezed, and dried.
At this time, the liquid film of the polymer latex is preferably air-dried or dried under conditions such that the polymer particles in the latex are not subjected to thermal history as much as possible. The amount of polymer latex impregnated into the substrate is preferably about 10 to 150% by weight. As a method for adsorbing oil in water with the oil adsorbent of the present invention, it is preferable to use it as a filter in a normal filtration device or as a pretreatment filter in a normal treatment facility.

However, when adsorbing oil that is completely floating on the water surface, it is also possible to float this oil adsorbent on the water surface and adsorb and remove it, but in this case, the base of this oil adsorbent is
Preferably, it is durable and does not lose its shape even when it absorbs oil and water. The polymer latex conveniently used in the present invention exhibits a low viscosity even if the average molecular weight of the high molecular weight polymer it contains is high. still,
Even highly concentrated polymer latexes have low viscosity. Therefore, the substrate and the polymer latex have good compatibility, the polymer latex can be sufficiently impregnated, and the amount of high molecular weight polymer that coats the substrate with a high concentration of the polymer latex can be increased. As a result, the oil adsorbent of the present invention can exhibit a remarkable amount of oil adsorption. The present invention will be explained in more detail below with reference to Examples.

Example 1 SBR latex (JSR-0561, manufactured by Japan Synthetic Rubber) and polyvinyl acetate latex (Polysol PS-10)
(manufactured by Showa Kobunshi) was mixed with 50 parts in terms of solid content and impregnated into a nonwoven fabric (rayon/Tetron: 80/2 dry nonwoven fabric with a final basis weight of 100 mm/apparent specific gravity of 0.0). After that, it was squeezed lightly and dried in a blow dryer (80 qo x 20 minutes).

The amount of latex solid content adhered to the obtained oil adsorbent was 5% by weight relative to the substrate.

The ability of this oil adsorbent to adsorb oil in water was measured using the apparatus shown in the attached drawing.

In the figure, 1 is a glass cylinder with an inner diameter of 8 mm, 2 is an 80-mesh stainless wire mesh stretched on the bottom surface of the cylinder, 3 is a sample inlet, 4 is an oil adsorbent housed in the cylinder 1, and 5
is the furnace, and 6 is the Erlenmeyer flask.

This oil adsorbent was cut into circles with a diameter of 8 arcs, 10 pieces were packed in 1 glass cylinder, and 100 pieces of melon oil (naphthenic process oil, aromatic process oil, machine oil, edible oil) was contained in water. One sample of each of the four types was poured into the glass cylinder at a speed of 1 hour/1 minute.

The residual oil content of each filtered sample is removed by natural filtration.
The content of n-hexane extractable substances in waste water was measured according to the method for measuring the content, and the results are shown in Table 1. As a comparative example, a substrate (nonwoven fabric) was also measured in the same manner. The measurement results show that this oil adsorbent has superior ability to adsorb oil in water compared to the base material. Table 1 Notes ■ The method for measuring the content of n-hexane extractable substances in waste water was in accordance with JIS-KOI02-1971-(13).

■ Naphthenic process oil; Komorex No. 2 process oil (manufactured by Nippon Oil) aromatic process oil; Mitsubishi No. 2 process oil (manufactured by Mitsubishi Oil) machine oil;
No. 1-120 machine oil Edible oil; Rapeseed oil Example 2 SBR latex (JSR-0561, JSR-121 female, JSR-0668; all manufactured by Japan Synthetic Rubber) and polyvinyl acetate latex (Polysol S-5, Showa After impregnating a nonwoven fabric (same as in Example 1) with a mixture of 5 parts of polymer and 5 parts of solids, three types of oil adsorbents were obtained in the same manner as in Example 1. Ta.

The solid content of the polymer latex in each oil adsorbent was 5% by weight based on the substrate. The ability of each oil adsorbent to adsorb oil in water was measured in the same manner as in Example 1.

However, benzene is used as the oil in water, and its concentration is 1
It was a trace of 00. Gas chromatography was used to measure the benzene content in water, and the results are shown in Table 2. As a comparative example, a substrate (nonwoven fabric) was also measured in the same manner. It can be seen that all of the present oil adsorbents have superior performance in adsorbing benzene in water compared to the base material.

-Table 2- Kotaku■ Method for measuring benzene content in water; JIS-K
OI02-1971 (13) Method for Measuring the Content of N-Hexane Extracted Substances in Drainage The n-hexane extract after extraction with n-hexane is separated into n-hexane and benzene components by a conventional method such as gas chromatography. Separated and quantified.

A simple explanation of the drawing The figure is a schematic diagram of the apparatus used in each example.

1...Glass cylinder, 2...Stainless steel wire mesh, 3.
...Sample inlet, 4...Oil extraction adsorbent, 5.
... Furnace, 6 ... Erlenmeyer flask.

Claims (1)

[Claims] 1. One or more polymer latexes per 100 parts by weight of at least one substrate selected from the group consisting of woven fabrics, nonwoven fabrics, cotton fibers, and sponge-like foams. An oil adsorbent in water, which is obtained by impregnating 10 to 150 parts by dry weight of oil and then drying it. 2 The above polymer latex is a rubber latex such as styrene-butadiene copolymer latex, polybutadiene latex, acrylonitrile-butadiene copolymer latex, polyisoprene latex, or polyvinyl acetate latex, vinyl chloride-vinyl acetate copolymer latex, etc. At least one selected from the group of resin latexes such as composite latexes and ethylene-vinyl acetate copolymer latexes.
The oil adsorbent in water according to claim 1, which is a seed.