JP5413639B2 - Method for producing scattering inhibitor - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for producing a scattering inhibitor for reusing waste used in work for handling asbestos such as asbestos removal work for buildings, for example.

Conventionally, asbestos (asbestos) has been frequently used for building materials for ceilings and walls of houses and the like because of its high heat retention and fire resistance effects. As is well known, however, asbestos has a very fine fiber shape, especially when the asbestos is exposed to the indoor space, the asbestos scatters in the air and the human body inhales it. Has a large social impact. Against this background, in recent years, asbestos removal work has been performed on buildings where asbestos is used.
And since the waste containing asbestos generated from these work sites is handled as specially controlled industrial waste, it is stored in a waste disposal bag dedicated to asbestos and disposed of at a predetermined disposal site. In addition to this, there is a treatment method for detoxifying in order to prevent the dispersion of waste containing asbestos during transportation (see, for example, Patent Document 1).

In Patent Document 1, the collected waste asbestos material is finely divided by a crusher, an organic or inorganic material having an adhesion function is added to the kneaded material, kneaded, and pressurized, so that the pressurized organic and inorganic materials are binders. This is a method for detoxifying a pellet by forming a pellet by adhering and solidifying the crushed waste asbestos material, and then dissolving the pellet.
JP 2000-79380 A

However, the conventional asbestos waste disposal has the following problems.
In other words, asbestos removal work requires the wearing of protective gear (eg, masks, gloves, protective clothing, etc.) according to the work level. Every time I get out of the work area, I replaced my protective gear with a new one. Therefore, as the number of people working in the work area increases, the quantity and capacity (volume) of used protective equipment to be disposed of also increase. For example, if 10 workers a day enter and leave the work area four times, as many as 40 protective clothing will be discarded. Further, isolation materials such as a curing sheet for isolating the work section and a filter of a negative pressure dust removing device are generated in the same manner. Moreover, in the case of protective clothing, the volume is larger than that of gloves etc., so it costs transportation costs to transport them to a disposal site and embed them in a predetermined place, and processing costs according to the volume of waste. There was a problem. In the incineration facility demolition work, protective equipment with dust contaminated with dioxin was generated, and the same problem occurred.

  The present invention was made in view of the above-mentioned problems, and is a scattering inhibitor that can reduce costs such as transportation costs and disposal costs by secondary use of used protective members and isolation materials as raw materials. It aims at providing the manufacturing method of.

In order to achieve the above object, in the method for producing a scattering inhibitor according to the present invention, scattering using a protective member or isolation material formed from polyvinyl alcohol that is used in work for handling harmful substances and is soluble in water. A method for producing an inhibitor, in which a protective member or isolation material to which a harmful substance has adhered is immersed in water and dissolved to obtain a polyvinyl alcohol aqueous solution in which the harmful substance is dispersed, and an additive is added to the polyvinyl alcohol aqueous solution. And a step of producing a scattering inhibitor.

  In the method for producing a scattering inhibitor according to the present invention, the harmful substance may be asbestos.

  In the present invention, protective members and isolation materials (hereinafter referred to as protective members, etc.) used for work that handles hazardous substances are made of water-soluble polyvinyl alcohol, so that the harmful substances are attached. By immersing a used protective member or the like in water, the harmful substance itself can be dispersed in the treatment liquid and wetted to prevent re-scattering. Furthermore, since the treatment liquid becomes an aqueous polyvinyl alcohol solution, for example, when the harmful substance is asbestos by adding an additive having functions such as permeability and wettability to the aqueous polyvinyl alcohol solution. The scattering inhibitor which has the effect of solidifying asbestos and suppressing scattering can be manufactured. And since it becomes possible to spray and use the manufactured scattering inhibitor on the wall surface etc. before asbestos removal, the used protection member etc. can be used secondaryly as a raw material.

  Moreover, in the manufacturing method of the scattering inhibitor which concerns on this invention, it is preferable to adjust a density | concentration by adding water to a polyvinyl alcohol aqueous solution with an additive.

  In this invention, the suitable scattering inhibitor according to use conditions can be manufactured by adding water to the polyvinyl alcohol aqueous solution which added the additive, and adjusting a density | concentration.

  According to the method for producing a scattering inhibitor of the present invention, the protective member and the isolation material used in the work for handling the harmful substance are formed from polyvinyl alcohol that is soluble in water. By adding an additive to the polyvinyl alcohol aqueous solution obtained by dissolving the isolation material (hereinafter referred to as a protective member, etc.) with water, it is possible to produce a scattering inhibitor equivalent to that on the market. The protective member or the like can be used as a raw material, and can be secondarily used as a scattering inhibitor without discarding the protective member or the like itself. Therefore, for example, it is not necessary to transport and discard a used protective member or the like to which asbestos, which is a harmful substance, is attached to a waste disposal site, thereby reducing transportation costs and processing costs for disposal. Furthermore, there is no need to purchase a new scattering inhibitor, and the cost can be reduced.

Hereinafter, the manufacturing method of the scattering inhibitor of this invention is demonstrated based on FIG. 1 thru | or FIG.
FIG. 1 is a diagram showing an outline of a method for producing a scattering inhibitor according to an embodiment of the present invention, FIG. 2 is a diagram showing a production flow of the scattering inhibitor, and FIG. 3 is a cross-sectional view showing the structure of protective clothing.

  As shown in FIG. 1, the method for manufacturing a scattering inhibitor according to the present embodiment is, for example, an operation for handling asbestos such as a demolition work or an asbestos removal work for a building in which asbestos (hazardous substances) is used in the work area R. It is applied when the protective clothing 1 used in the above is reused as a scattering inhibitor without being transported to a disposal site and discarded.

  That is, as shown in FIGS. 1 and 2, the method for producing the present scattering inhibitor dissolves protective clothing 1 (protective member) formed of polyvinyl alcohol (PVA) that has a blocking property and is soluble in water. Sprinkled by adding the appropriate additive 4 to the aqueous solution of polyvinyl alcohol (hereinafter referred to as PVA solution 3), which is charged into the dissolution tank 21 of the processing apparatus 2 and dissolved by reacting with water W1, thereby becoming a processing liquid. The inhibitor 5 is produced. Further, the concentration of the PVA solution 3 is adjusted by adding an appropriate amount of water W2 together with the additive 4.

  And the scattering inhibitor 5 produced | generated by the manufacturing method sprays on the building wall surface etc. which are demolished or removed equivalent to the conventional scattering inhibitor (for example, "Astector" (trademark registration made by Shimizu Construction Co., Ltd.)). As a result, it penetrates into the target building material and has a function of binding and solidifying the fibers of the asbestos inside.

  As shown in FIG. 3, the material of the protective clothing 1 used in the work area R is a sheet-like three layer in which a film layer 1 a formed of PVA is sandwiched between nonwoven fabric layers 1 b and 1 c having dissolution performance from the upper and lower surfaces. It has a structure. Here, the barrier property of the film layer 1a has the capability of blocking fine asbestos fibers forming asbestos. Moreover, as a material of the nonwoven fabric layers 1b and 1c, for example, polyvinyl alcohol (PVA) having a melting temperature of 20 ° C or higher, 40 ° C or higher, 50 ° C or higher, 60 ° C or higher, 70 ° C or higher, 80 ° C or higher, 95 ° C or higher. And those formed by a production method such as spunlace, spunbond thermal bond, chemical bond, and meltblown can be used. In addition, as water W which melt | dissolves this protective clothing 1, any of normal temperature water, warm water, and hot water may be sufficient. And the protective clothing 1 comprised in this way becomes the PVA solution 3 by reacting with water W and dissolving as mentioned above.

A melting treatment apparatus 2 shown in FIG. 1 includes a melting tank 21 and a discharge port 22, and is installed in the vicinity of the work area R in the present embodiment. The dissolution tank 21 can store water W1 having a predetermined temperature as a solvent, has a capacity capable of immersing the protective clothing 1 forming a solute in the water W1, and is kept warm by a heat insulating material such as glass wool. It is possible. The discharge port 22 is a portion through which the protective clothing 1 feeds the PVA solution 3 dissolved by the water W1, and is provided at a predetermined position such as a side surface of the dissolution tank 21.
The PVA solution 3 fed from the discharge port 22 is sent to the mixing tank 6. The mixing tank 6 is for adding the additive 4 and the water W2 to the PVA solution 3 and mixing them, thereby generating the scattering inhibitor 5 having properties according to the purpose.

The additive 4 gives the PVA solution 3 penetrability and wettability. For example, dapro (surfactant), glycerin, bengara (pigment) and the like can be used. For example, Bengala is added in order to confirm the spots when the scattering inhibitor 5 is sprayed.
Specifically, as the kind and blending of the additive 4 added to the PVA solution, for example, the one disclosed in Japanese Patent No. 2560231 can be adopted. That is, the concentration of the PVA solution is preferably 10% by weight or less, and good penetrability into the building material can be obtained by spraying 2% by weight or less. Moreover, high wettability with respect to asbestos in building materials is obtained by adding 0.01 to 0.1% of an anionic or nonionic surfactant as a penetration aid to the asbestos-containing fireproof coating material in the PVA solution. It is done. Furthermore, stickiness can be increased and asbestos can be captured by adding 5% or less of boric acid or borax as a gelling agent for PVA. Furthermore, in order to improve the coating effect on the surface of the asbestos-containing building material, 5 to 10% of a pigment such as titanium oxide fine powder having a strong hiding power, hydrous iron oxide, or bengara can be added. An appropriate fragrance may be added as the additive 4.

  As shown in FIG.1 and FIG.2, in this manufacturing method of a scattering inhibitor, since the protective clothing 1 used for the operation | work which handles asbestos is formed with the material of the polyvinyl alcohol which can be dissolved with water, asbestos adheres. The used protective clothing 1 is put into the dissolution tank 21 of the dissolution treatment apparatus 2 installed in the vicinity of the work area R and is immersed in water to dissolve it. Asbestos itself is dispersed in the treatment liquid to be in a wet state. Re-scattering can be prevented. And since the melt | dissolved process liquid turns into the PVA solution 3, it dilutes with the water W2, adding the additive 4 which has functions, such as a permeability | transmittance and wettability, to the PVA solution 3 in the mixing tank 6 mentioned above. By adjusting the concentration, the scattering inhibitor 5 having the effect of suppressing scattering by solidifying asbestos can be produced. The produced scattering inhibitor 5 is equivalent to a commercially available product because the PVA solution 3 obtained by dissolving the protective clothing 1 with water becomes a commercially available PVA solution as a raw material for the asbestos scattering inhibitor. The drug will be obtained.

Furthermore, in this manufacturing method, the suitable dispersion | distribution inhibitor 5 according to use conditions can be manufactured by adding water W2 to the PVA solution 3 which added the additive 4, and adjusting a density | concentration.
Thus, since it becomes possible to spray and use the manufactured scattering inhibitor 5 on the wall surface etc. before asbestos removal, the used protective clothing 1 can be used secondary as a raw material.

In addition, the scattering inhibitor 5 is for extracting only the solution. Unnecessary substances left by filtration or the like are transported to a disposal site together with asbestos waste and discarded. The amount of unnecessary materials at this time is as small as about 1/20, for example, compared to the volume of the used protective clothing 1.
And the scattering inhibitor 5 sprayed on the building material is transported as a special management waste together with the asbestos waste after removal, and is disposed to landfill.

  As described above, in the method for manufacturing a scattering inhibitor according to the present embodiment, the protective clothing 1 used for the work of handling asbestos is formed from polyvinyl alcohol that is soluble in water. By adding additive 4 to PVA solution 3 obtained by dissolving water with water W1, scattering inhibitor 5 equivalent to that commercially available can be produced, using used protective clothing 1 as a raw material, The protective clothing 1 itself can be secondarily used as the scattering inhibitor 5 without being discarded. Therefore, it is not necessary to transport the used protective clothing 1 to which the asbestos adheres to the waste disposal site and dispose of it, and it is possible to reduce transportation costs and processing costs for disposal. Furthermore, there is no need to purchase a new scattering inhibitor, and the cost can be reduced.

As mentioned above, although embodiment of the manufacturing method of the scattering inhibitor by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the present embodiment, the concentration is adjusted by adding the additive 4 and the water W2 to the PVA solution 3 obtained by dissolving the protective clothing 1 with the water W1, but the step of diluting with the water W2 if not necessary. Can be omitted.
Moreover, in this Embodiment, although the protective clothing 1 which a worker wears as a protective member is made into the manufacturing object of a scattering inhibitor, it is not limited to this, For example, in a mask, gloves, a hat, a work area The isolation sheet (isolation material) used may be used as a manufacturing object. The point is that the material to be manufactured can be dissolved in water and can be made of a material using polyvinyl alcohol.

Furthermore, although the structure of the protective clothing 1 is made into the three-layer structure which consists of the film layer 1a and the nonwoven fabric layers 1b and 1c which cover the both surfaces, it is not limited to this, For example, from a film layer and one nonwoven fabric layer It may be a two-layer structure, only a film layer, or only a non-woven fabric layer.
Furthermore, the configuration of the dissolution treatment apparatus, the capacity of the dissolution tank 21, the temperature of the water W1 in the dissolution tank 21, the dissolution time, and the like can be appropriately set according to conditions such as the number and size of the protective members to be dissolved. it can.
In the present embodiment, the harmful substance is asbestos, but the present invention is not limited to this. For example, in demolition work of an incineration facility, dust contaminated with dioxin can be used as a harmful substance.

It is a figure which shows the outline | summary of the manufacturing method of the scattering inhibitor by embodiment of this invention. It is a figure which shows the manufacture flow of a scattering inhibitor. It is sectional drawing which shows the structure of protective clothing.

Explanation of symbols

1 Protective clothing (protective material)
2 Dissolution equipment 3 PVA solution (polyvinyl alcohol aqueous solution)
4 Additive 5 Splashing inhibitor 6 Mixing tank R Work space W, W1, W2 Water

Claims (3)

A method for producing a scattering inhibitor using a protective member or isolation material formed from polyvinyl alcohol that is used for handling hazardous substances and is soluble in water,
Immersing and dissolving the protective member and the isolation material to which harmful substances are adhered in water to obtain a polyvinyl alcohol aqueous solution in which the harmful substances are dispersed ; and
Adding an additive to the aqueous polyvinyl alcohol solution to produce a scattering inhibitor;
The manufacturing method of the scattering inhibitor characterized by having.   The method for producing a scattering inhibitor according to claim 1, wherein the harmful substance is asbestos.   The method for producing a scattering inhibitor according to claim 1 or 2, wherein the concentration is adjusted by adding water to the aqueous polyvinyl alcohol solution together with the additive.

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