JP2012024683A - Waste liquid solidifying material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste liquid solidifying material which is environment-friendly without discharging waste liquid of paint or indian ink nor waste liquid of an aqueous resin such as latex, an adhesive, ink or the like nor contaminating a river or sea, excelling in handleability for performing work, and capable of being formed into an easy-to-handle gel-like solidified substance.SOLUTION: Minute short fibers, each formed of chemical fiber, of 70-95% of the total weight, and sodium acrylate-based water-absorbing polymers, each having a particle diameter of 20-150 μm, of 5-30% of the total weight are mixed in waste liquid to be agitated and left, and thereafter an obtained solidified product is discarded.

Description

    The present invention relates to a technology for materials for treating waste liquids such as resin, adhesives, inks, and the like such as waste liquids of paints and ink, and latex produced at factories and the like.

    The waste of paint and ink used at school is sent to a sewage treatment facility for treatment, but there is a movement to prevent it from an environmental point of view. However, at present, only a part of the pallet or tool is wiped off, and the sewage after washing such as brushes is often washed away. Latex, adhesives, inks, etc., are usually processed at wastewater treatment facilities in large-scale factories for both water and solvent systems. However, in small and medium-sized factories, waste liquid is stored and collected by a contractor. It is common. These waste liquids are difficult to handle by being transported inside the factory or transported outside the factory, there is a problem of liquid leakage, and the cost of the treatment is also expensive.

    As a technique for treating the waste liquid, a method for causing the water-absorbing polymer to absorb the waste liquid is generally known.

    Patent Document 1 discloses solidifying a water-based paint. Further, Patent Document 2 discloses a mixture containing a water-absorbing resin and a filler for solidifying aqueous and solvent-based liquids.

JP-A-8-120254 JP 2003-20474 A

    It is not good from an environmental point of view to drain waste liquids such as paint and ink waste water and latex-based water-based resins, adhesives, and ink into sewage, rivers, and the sea. Also, the cost to be collected by the trader is expensive, and it is troublesome to handle by transporting it inside the factory until it is stored or transporting it outside the factory, and there is also a problem of liquid leakage. Therefore, the issue is that it is environmentally friendly without polluting rivers and the sea without being discharged. It is also important for the industrial use to make it cheaper than the cost of treating the waste liquid.

    By the way, when absorbing polymer particles are used to absorb the aqueous waste liquid, the problem of large weight and the affinity between the particles work, and the polymer that has absorbed the waste liquid is difficult to stir. In addition, practical use in this field has been difficult because of its low absorption capacity for solvent-based waste liquids.

    In addition, the aqueous waste liquid treatment agent described in Patent Document 1 takes from half a day to one day for solidification, which is considerably inconvenient in actual use. In addition, since the material is solidified like cement, there is a problem that it is difficult to take out from the container or the like at the time of disposal. Furthermore, since the solidified product has an acute angle, the bag that wraps them may be torn, and there is a problem in handling.

    Furthermore, the water-based and solvent-based waste liquid treatment agents described in Patent Document 2 have a small aspect ratio and a low volume, and therefore, when mixed with the waste liquid, they aggregate and become in a poorly dispersed state. As a result, in an actual operation such as a factory where the waste liquid solidifying material is put in a container such as a canister or drum can in advance, and the waste liquid is added and stirred as appropriate from above, and the waste liquid is continuously added and stirred repeatedly. There was a problem that it became difficult to stir and a problem of drastic decrease in water absorption ability. Another problem with solvent-based wastewater is its low absorption capacity.

    Summarizing these problems, the properties desired as a waste liquid solidifying material are as follows. One is that it is environmentally friendly, without draining water and solvent waste, and without polluting rivers and the sea. Second, the processing time is short. Specifically, it should be several minutes to several tens of minutes. The third is that it can be stirred while stored in a container and the process can continue until the container is filled. In other words, it must be easy to handle. The fourth is that when discarded, it becomes too hard to stick and cannot be removed from the container, or the solidified product has an acute angle and the bags that wrap them are not torn. For example, it must be gel.

    Therefore, the present invention does not discharge waste liquid, is environmentally friendly without polluting rivers and seas, and is solidified within a few minutes to several tens of minutes. The problem is to provide a solidified waste liquid material.

    In order to solve these problems, the present invention is configured as follows.

    First, the invention according to claim 1 is a waste liquid solidifying material which solidifies the waste liquid by mixing and stirring with the waste liquid, and comprises ultrafine short fibers composed of chemical fibers of 70% to 95% of the total weight and the total weight. 5% to 30% of a sodium acrylate water-absorbing polymer having a particle size of 20 μm to 150 μm.

    Next, the invention described in claim 2 is characterized in that, in the invention described in claim 1, the ultra-short fibers are generated as shavings during the production of the raised fiber sheet.

    Furthermore, the invention described in claim 3 is formed by mixing and stirring the waste liquid solidified material according to any one of claims 1 or 2 in an aqueous waste liquid, and then discarding the solidified product obtained after standing. It is characterized by that.

    In addition, the invention described in claim 4 is a method of mixing and stirring the solvent-based waste liquid with the waste liquid solidifying material according to any one of claims 1 or 2 to discard the solidified product obtained after standing. It is characterized by.

    According to invention of Claim 1, when processing an aqueous and solvent-type waste liquid, the ultrafine fiber which consists of a chemical fiber of 70%-95% of the total weight, and the particle size of 5%-30% of the total weight Since it is mixed with a sodium acrylate water-absorbing polymer comprising 20 μm to 150 μm, the waste liquid can be quickly taken in between the fibers by utilizing the capillary phenomenon of ultra-short fibers. Further, the waste liquid can be held and absorbed by the entangled portion between the ultrafine fibers and the water-absorbing polymer. In addition, due to the effect of the blending ratio of the present invention, the capillary phenomenon and the affinity between the water-absorbing polymer particles can be maintained in a well-balanced manner, and both aqueous and solvent waste liquids are easy to handle and easy to handle. Can be solidified.

    Moreover, since it consists of a chemical fiber, compared with a natural fiber, since it has high chemical resistance with respect to an acid etc. and its hydrophilicity is low, it is rarely dissolved in a waste liquid. In addition, there is an effect that molds and fungi hardly grow after solidification. Furthermore, for waste liquids that contain components such as solvent-based adhesives and solvents such as ethyl acetate, ethanol, lacquer thinner, methyl ethyl ketone, and surfactants and pH adjusters that are included in water-based latex. Solidification can be realized.

    In addition, since it is an ultra-fine short fiber, it has a larger aspect ratio and higher bulk than powder, so put waste liquid solidifying material in a container, and then add waste liquid as appropriate from above, stir, and then add waste liquid Even in an operation in which stirring is repeated, stirring can be easily performed, the absorption capacity of the invention can be maintained, and the waste liquid can be solidified while being stored for a long period of time.

      By stirring the inventive product and the waste liquid, the waste liquid can be made into a gel-like solidified product for several minutes to several tens of minutes even in aqueous and solvent systems. Therefore, if this is disposed of as a gel-like solid, the waste liquid can be made into a gel-like solidified product that does not pollute the rivers or the sea without draining the waste liquid, and is easy to handle and easy to handle. Providing solidification material can be achieved.

    In addition, although it is not a clear definition, an ultrafine fiber is generally known by showing the thing of 50 micrometers or less thinner than silk. The thinnest fiber that can be manufactured by a melt spinning method or the like is about 1 to 5 μm. In addition, it is considered that about 0.5 μm can be achieved with a split fiber formed by raising or the like. Furthermore, the short fiber is the longest and known as about 100 mm, and the shortest is known as about 1 μm.

    As the chemical fiber constituting the ultrafine short fiber of the present invention, polyester, nylon, polypropylene, polyethylene, acrylic, polyurethane and the like can be used, the length is about 1 μm to 2 mm, and the thickness is 0.5 μm to 50 μm. It is about.

    Next, according to invention of Claim 2, the length of the ultrafine short fiber of the shaving powder at the time of manufacture of a raising fiber sheet is 10 micrometers-200 micrometers, and since thickness is 1 micrometer-10 micrometers. The balance of aspect ratio is very good, the volume of the inventive product and the volume of waste liquid absorbed are almost the same or the volume of the inventive product can be made smaller. The processing capacity can be kept high while preventing overflow. Therefore, after stirring, it can be more reliably solidified in a few minutes to several tens of minutes. In addition, materials that are disposed of as industrial waste can be used effectively, so it is possible to provide waste liquid solidification materials that are more environmentally friendly, and it is cheaper, so it is cheaper than the current cost of transporting and recovering waste liquid. It becomes possible to do.

    According to the invention described in claim 3, it was obtained after being left standing by mixing and stirring the aqueous waste liquid such as paint, latex or ink with the waste liquid solidifying material according to claim 1 or 2. Solidified material can be discarded. The aqueous waste liquid can be processed at a weight ratio of about 5 to 30 times that of the product of the present invention, and can be formed into a gel-like solidified product in several minutes. Therefore, if this is disposed of as a gel-like solid, it does not discharge waste liquid, is environmentally friendly without polluting rivers and seas, and is solidified for several minutes to several tens of minutes. It is possible to provide a waste liquid solidifying material that can be easily gelled solidified.

    According to the invention described in claim 4, the solvent-based waste liquid such as adhesive, paint, ink, etc. is mixed with the waste liquid solidifying material according to claim 1 or 2, and then obtained after standing. The solidified product can be discarded. The solvent-based waste liquid can be treated at a weight ratio of about 5 to 15 times that of the product of the present invention, and can be made into a gel-like solid product for several minutes to several tens of hours. Therefore, if this is disposed of as a gel-like solid, it does not discharge waste liquid, is environmentally friendly without polluting rivers and seas, and is solidified for several minutes to several tens of minutes. It is possible to provide a waste liquid solidifying material that can be easily gelled solidified.

An example of experimental data for the purpose of confirming the treatment capacity for the aqueous waste liquid of the present invention will be described.
In order to confirm the solidification ability by blending with ultrafine short fibers consisting of 60-97% of the total weight of chemical fibers and 3-40% of the total weight of the water-absorbing polymer, the test was conducted as follows. went.
As the ultra-fine fiber, use of Toray's approximately 50mm polyester fiber length of approx. 0.1mm and thickness of approx. As an absorbent polymer, sodium polyacrylate having a different particle diameter, Sanyo Chemical Industries, Ltd., trade name Sunfresh ST-500MPSA (hereinafter referred to as polymer A) having a particle diameter of about 20 to 50 μm, particle diameter. The product name Sunfresh YH-2 (hereinafter referred to as polymer B) having a particle size of about 50 to 150 μm and the product name Sunfresh ST-573 (hereinafter referred to as polymer C) having a particle size of about 150 to 710 μm were used. In this test, tap water was used as the waste liquid.
As shown in the table, 50 g of the waste liquid solidifying material of the present invention was put in each container, and water having a weight ratio of 8 to 16 times was added to the waste liquid solidifying material and stirred for 1 minute. After 10 minutes, the mixture was stirred several times and observed.

    First, the evaluation methods in Table 1 are described. Appropriate means a gel-like solidified product that can be easily stirred for 1 minute in the initial stage and can be rounded into a spherical shape after 10 minutes of stirring. Next, poor solidification means that the initial stirring is easy for 1 minute, and after 10 minutes of stirring, it cannot be maintained even when rounded into a spherical shape or becomes liquid. In addition, poor dispersion means that there is a problem in stirring for 1 minute in the initial stage, and most or part of it becomes a gel-like solidified product, but the solidified product and liquid cannot be sufficiently mixed. It will be. Further, poor dispersion and solidification means that there is a problem with stirring for 1 minute in the initial stage, and after 10 minutes of stirring, it cannot be retained even when rounded into a spherical shape or becomes liquid.

    Consider the results in Table 1 above. From the results, it can be said that the blending amount of 5% to 30% is appropriate for the polymer A. For polymer B, a blending amount of 5% to 40% is appropriate. Further, when polymer C was used, a large amount of polymer C was observed at the bottom of the container, and poor dispersion and poor solidification of dispersion were observed. In summary, the water-absorbing polymer was blended in an amount of 5% to 30% of the total weight, and selection of a particle size of 20 μm to 150 μm was most appropriate.

An example of experimental data for the purpose of confirming the treatment capacity for the solvent waste liquid of the present invention will be described. As the ultrafine fibers, the length of the shaving fiber at the time of manufacturing the raised fiber sheet made of about 50% polyester, about 30% nylon and about 20% polyurethane by Toray Industries, Inc. is about 0.1 mm, and the thickness is about 1 to 5 μm. Further, as a water-absorbing polymer, 10% of Sanyo Kasei Kogyo Co., Ltd. product name Sun Fresh YH-2 (Polymer B) having a particle size of about 50 to 150 μm is mixed and mixed as a test material. did.
50 g of the test material of the present invention and the residual paint treatment agent B composed of the superabsorbent resin and alumina silicate in Patent Document 2 are put into each container as shown in the table, and the weight ratio of the waste liquid solidifying material is 8 Double each solvent in Table 2 was added and stirred for 1 minute. After 10 minutes, the mixture was stirred several times and observed. In this test, in order to solidify solvent-based waste liquid and residual paint, it is considered important to solidify the liquid component of the solvent that may be blended in the ink. A solvent was selected.

    First of all, the evaluation method of Table 2 shows that “proper” means a gel-like solidified product that can be easily stirred for 1 minute in the initial stage and can be rounded into a spherical shape after 10 minutes of stirring. Next, poor solidification means that the initial stirring is easy for 1 minute, and after 10 minutes of stirring, it cannot be maintained even when rounded into a spherical shape or becomes liquid.

    From the above results, it was found that the inventive product has an excellent treatment capacity even for solvent-based waste liquids.

An example of experimental data for the purpose of confirming the processing capability and handling property for the waste liquid of the present invention will be described. As the ultrafine fibers, the length of the shaving fiber at the time of manufacturing the raised fiber sheet made of about 50% polyester, about 30% nylon and about 20% polyurethane by Toray Industries, Inc. is about 0.1 mm, and the thickness is about 1 to 5 μm. Further, as a water-absorbing polymer, 10% of Sanyo Kasei Kogyo's trade name Sunfresh YH-2 (Polymer B) having a particle size of about 50 to 150 μm, which is a sodium acrylate type, was mixed and mixed as a test material. did.
The test material of the present invention, the residual paint treatment agent A (trade name mighty solidifying agent) in Patent Document 1, and the residual paint treatment agent B consisting of a superabsorbent resin and alumina silicate in Patent Document 2, Each 1 kg of test material was added. Each 10 kg of waste liquid was added and stirred for 1 minute. After 1 hour, 6 kg of waste liquid was added and stirred for 1 minute. After 10 minutes, the mixture was stirred several times and observed. In this test, tap water and acrylic latex were used as waste liquid and residual paint.

    First of all, the evaluation method in Table 3 shows that appropriate is easy to stir for an initial 1 minute, easy to stir for an additional 1 minute, and becomes a gel-like solidified product that can be rounded into a sphere after 10 minutes of stirring. It is. Next, poor solidification means that it is easy to stir for an initial 1 minute, easy to stir for an additional 1 minute, and after 10 minutes of stirring, it cannot be retained even when rounded into a sphere, or becomes liquid. In addition, poor dispersion means that there is a problem in stirring for 1 minute in the initial stage, and most or part of it becomes a gel-like solidified product, but the solidified product and liquid cannot be sufficiently mixed. It will be.

    Consider the results in Table 3 above. From the results, the remaining coating material treatment agent A in Patent Document 1 was poorly solidified. This is due to the slow solidification rate. However, solidification like cement was observed after 2 days. However, solidifying like a cement becomes a problem that it is difficult to take out from a container or the like at the time of disposal or that the solidified product has an acute angle, and the bag that wraps them is torn. . The residual paint treating agent B in Patent Document 2 was found to have poor dispersion, and a large amount of untreated white powder remained and was difficult to stir. In addition, it is recognized that the workability of repeating this repetitive paint processing agent B in a container, adding water and latex, stirring, and further adding water and latex, and stirring, It turned out that handling was bad.

    As described above, according to the present invention, without draining water-based or solvent-based waste liquid, it is environmentally friendly without polluting rivers and seas, and solidifies and works in about several minutes to several tens of minutes. It is easy to handle and provides a solidified liquid material that can be easily handled as a solidified gel, and is widely suitable for treating waste liquids such as paints and ink waste liquids, latex-based aqueous resins, adhesives and inks, etc. Can be used.

Claims (4)

  A waste liquid solidifying material which solidifies the waste liquid by mixing and stirring with the waste liquid, and comprises ultrafine short fibers composed of chemical fibers of 70% to 95% of the total weight and a particle size of 20 μm of 5% to 30% of the total weight A waste liquid solidifying material comprising a mixture of a sodium acrylate water-absorbing polymer comprising 150 μm.   The waste liquid solidifying material according to claim 1, wherein the ultrafine short fibers are generated as shavings during the production of the raised fiber sheet.   A waste liquid treatment method, comprising mixing an aqueous waste liquid with the waste liquid solidifying material according to claim 1 and stirring the mixture, and then discarding the solidified product obtained after standing.   A waste liquid treatment method, comprising: mixing and stirring a solvent-based waste liquid with the waste liquid solidifying material according to claim 1, and discarding the solidified product obtained after standing.