초록 ▼

An object of the present invention is to provide a waste solution solidifying agent which can solidify a waste solution, particularly, a waste solution containing blood or body fluid at a low cost, uniformly, and in a short time; in particular, to provide a waste solution solidifying agent which can

An object of the present invention is to provide a waste solution solidifying agent which can solidify a waste solution, particularly, a waste solution containing blood or body fluid at a low cost, uniformly, and in a short time; in particular, to provide a waste solution solidifying agent which can solidify a waste solution uniformly and in a short time in a vertically oriented waste solution equipment. As a means of achieving this object, a waste solution solidifying agent of the present invention is a particulate treating agent used in a method of treating a waste solution which solidifies a waste solution into a gel by placing a treating agent in a waste solution, and is characterized in that said agent contains, as an essential component, a water-absorbent resin having a crosslinked structure obtained by polymerizing a water-soluble ethylenic unsaturated monomer and, when flowing-placed at once into a 0.90 mass % aqueous sodium chloride solution, 20 to 95 mass % of the agent is floated, and 80 to 5 mass % is settled. And a process for preparing a waste solution solidifying agent of the present invention is a process for preparing a particulate waste solution solidifying agent containing, as an essential component, a water-absorbent resin having a crosslinked structure obtained by polymerizing a water-soluble ethylenic unsaturated monomer, and comprises a step of mixing a hydrophobic substance having a methanol index of 20 or more after polymerization.

대표청구항 ▼

1. A method of solidifying a medical waste solution, which is a method of treating a medical waste solution containing blood or body fluid comprising placing a treating agent into a medical waste solution containing blood or body fluid in an effective amount to solidify the medical waste solution in

1. A method of solidifying a medical waste solution, which is a method of treating a medical waste solution containing blood or body fluid comprising placing a treating agent into a medical waste solution containing blood or body fluid in an effective amount to solidify the medical waste solution into a gel, wherein the treating agent is a particulate waste solution solidifying agent, said waste solution solidifying agent comprising, as an essential component, a water-absorbent resin having a crosslinked structure obtained by polymerizing a monomer containing acrylic acid and/or a salt thereof as a main component, and further comprising a non-volatile hydrophobic substance powder having a methanol index of 20 or more, wherein when placed in a 0.90 mass % aqueous sodium chloride solution at once, 20 to 95 mass % of the agent is floated, and 80 to 5 mass % of the agent is settled, provided that floating and settling are defined by the state at one minute after placement of 40 g of a particulate waste solution solidifying agent at once in a measuring cylinder having an effective volume of 1000 ml (inner diameter 66 mm) which has a vertical axial direction and contains 1000 ml of a 0.90 mass % aqueous sodium chloride solution at 25° C., and the hydrophobic substance being a powder where 90 to 100 mass % of the powder has a particle diameter of 200 μm or smaller, and the amount of the hydrophobic substance powder is 0.001 to 10 mass % relative to the total amount of the water-absorbent resin particles, and wherein Methanol Index: when 1 g of a hydrophobic substance is added to 50 ml of pure water at 25° C., in the case where the hydrophobic substance is a solid, a volume (ml) of methanol at 25° C. necessary for wetting, or in the case where the hydrophobic substance is a liquid, a volume (ml) of methanol at 25° C. necessary for dispersing and/or emulsifying the hydrophobic substance. 2. The method of solidifying a medical waste solution according to claim 1, wherein when the waste solution solidifying agent is placed into a 0.90 mass % aqueous sodium chloride solution at once, 25 to 80 mass % of the agent is floated, and 75 to 20 mass % of the agent is settled. 3. The method of solidifying a medical waste solution according to claim 1, wherein when 40 g of a waste solution solidifying agent is placed at once in a measuring cylinder of an effective volume 1000 ml (inner diameter 66 mm) which stands with a vertical axial direction and contains 1000 ml of a 0.90 mass % aqueous sodium chloride solution at 25° C., a solidification time of from the placement to solidification of the aqueous sodium chloride solution is 60 to 700 seconds. 4. The method of solidifying a medical waste solution according to claim 1, wherein when 99 g of a waste solution solidifying agent is placed at once in a measuring cylinder of an effective volume 3000 ml (inner diameter 103 mm) which stands with a vertical axial direction and contains 3000 ml of an aqueous solution at 25° C. containing 20 mass % of defibered cattle blood relative to a 0.90 mass % aqueous sodium chloride solution, a solidification time of from the placement to solidification of the aqueous solution is 5 to 50 minutes. 5. The method of solidifying a medical waste solution according to claim 1, wherein when 40 g of a waste solution solidifying agent is placed at once in a measuring cylinder of an effective volume 1000 ml (inner diameter 66 mm) which stands with a vertical axial direction and contains 1000 ml of a 0.90 mass % aqueous sodium chloride solution at 25° C., a distribution of a water-absorbent resin after completion of solidification of the aqueous solution is 0 to 6 as expressed by a standard deviation. 6. The method of solidifying a medical waste solution according to claim 1, wherein when 99 g of a waste solution solidifying agent is placed at once in a measuring cylinder of an effective volume 3000 ml (inner diameter 103 mm) which stands with a vertical axial direction and contains 3000 ml of an aqueous solution at 25° C. containing 20 mass % of defibered cattle blood relative to a 0.90 mass % aqueous sodium chloride solution, a distribution of a water-absorbent resin after completion of solidification of the aqueous solution is 0 to 6 as expressed by a standard deviation. 7. The method of solidifying a medical waste solution according to claim 1, wherein the surface of the water-absorbent resin is further crosslinking-treated. 8. The method of solidifying a medical waste solution according to claim 1, said treating agent further comprising a hydrophilic substance having a methanol index of 0 to less than 20, in addition to the water-absorbent resin and a hydrophobic substance. 9. The method of solidifying a medical waste solution according to claim 1, wherein the hydrophobic substance is a solid at a normal temperature (25° C.) and a normal pressure. 10. The method of solidifying a medical waste solution according to claim 1, wherein the water-absorbent resin is granulated. 11. The method of solidifying a medical waste solution according to claim 1, wherein the waste solution solidifying agent with the hydrophobic substance added thereto has a covering index of a hydrophobic substance in a range of not less than 0.10 to less than 0.80. 12. The method of solidifying a medical waste solution according to claim 1, wherein the water-absorbent resin is an irregularly pulverized shape substance. 13. The method of solidifying a medical waste solution according to claim 1, wherein said hydrophobic substance is selected from the group consisting of a hydrocarbon, fatty acid, fatty acid ester, fatty acid amide, metal soap, silicone-based compound, surfactant and thermoplastic resin. 14. The method of solidifying a medical waste solution according to claim 1, wherein the content of the water-absorbing resin in the waste solution solidifying agent is 50 to 100 mass %. 15. The method of solidifying a medical waste solution according to claim 1, wherein the bulk density of the waste solution solidifying agent is 0.30 to 0.90 g/cm3, and the true density of the waste solution solidifying agent is 1.1 to 2.0 g/cm3. 16. The method of solidifying a medical waste solution according to claim 1, wherein the hydrophobic substance powder has a particle diameter smaller than a weight average particle diameter of said water-absorbent resin. 17. The method of solidifying a medical waste solution according to claim 1, wherein the hydrophobic substance powder is immobilized on a surface of the water-absorbent resin. 18. The method of solidifying a medical waste solution of claim 1, wherein said waste solution solidifying agent is added to the medical waste solution so that solidification progresses from an upper part of the waste solution to a lower part of the waste solution as part of the waste solution solidifying agent settles from the upper part to the lower part, and where a remainder of the waste solution solidifying agent floats on the waste solution. 19. The method of solidifying a medical waste solution of claim 18, wherein said waste solution is contained in a vertically oriented canister, and said method comprises adding said waste solution solidifying agent to said waste solution in said canister. 20. The method of solidifying a medical waste solution of claim 1, wherein said medical waste solution is blood. 21. The method of solidifying a medical waste solution of claim 1, wherein said medical waste solution is body fluid containing blood. 22. The method of solidifying a medical waste solution of claim 1, further comprising adding the waste solution solidifying agent to the medical waste solution to form a mixture and solidifying the resulting mixture.