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WO2005082987A1 - Agent antimousse et de retraction pour le polystyrene expanse et procede de demoussage et de retraction du polystyrene expanse - Google Patents

Agent antimousse et de retraction pour le polystyrene expanse et procede de demoussage et de retraction du polystyrene expanse Download PDF

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Publication number
WO2005082987A1
WO2005082987A1 PCT/JP2005/002009 JP2005002009W WO2005082987A1 WO 2005082987 A1 WO2005082987 A1 WO 2005082987A1 JP 2005002009 W JP2005002009 W JP 2005002009W WO 2005082987 A1 WO2005082987 A1 WO 2005082987A1
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WO
WIPO (PCT)
Prior art keywords
defoaming
styrofoam
agent
mass
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2005/002009
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English (en)
Japanese (ja)
Inventor
Ken-Ichi Oda
Jun-Ichirou Taniyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ODA INDUSTRY Co Ltd
Original Assignee
ODA INDUSTRY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ODA INDUSTRY Co Ltd filed Critical ODA INDUSTRY Co Ltd
Publication of WO2005082987A1 publication Critical patent/WO2005082987A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to a defoaming shrinking agent for styrofoam, and in particular, uses a dibasic acid ester-based styrofoam dissolving agent to defoam and shrink styrofoam without dissolving it, and to maintain its effect for a long time.
  • the present invention also relates to a defoaming / shrinking agent and a defoaming / shrinking method for styrofoam, which can omit or simplify various steps in a solvent separation / recovery plant and also consider safety.
  • Styrofoam which is a styrene resin foam, is widely used for packing materials such as industrial products, household goods, and foods because of its excellent cushioning property, heat insulation property, and moldability. The amount is increasing.
  • Patent Document 1 discloses a solvent system that is applicable to various plastics for safety and health and a method for recovering various plastics using the solvent system.
  • a plastic solvent mainly composed of at least one dibasic acid ester selected from dimethyl pinate and dimethyl succinate. The plastic is dissolved in this solvent, the temperature at which the plastic does not thermally decompose, and the flow of the plastic.
  • a method for recovering plastics is disclosed, which comprises a step of separating by distillation in a temperature range that satisfies both of the possible temperatures.
  • Patent Document 2 proposes a solvent composition and a method for defoaming and shrinking styrofoam, in which the volume of the styrofoam is reduced without completely dissolving the styrofoam and the styrofoam is in a form suitable for transportation and separation and recovery. Let's do it.
  • the solvent composition is a mixture of alcohols and water or a mixture of alcohols and triethanolamine (hereinafter, referred to as TEA).
  • Ethylene glycol hereinafter referred to as EG
  • EG Ethylene glycol
  • This solvent composition does not dissolve the styrene when it comes into contact with the styrene foam, but swells moderately, disrupts the cell walls of the cell, releases the gas contained in the cell, and destroys the structure of the foam. Then, the contacted styrene foam is shrunk. As a result, the styrene itself does not dissolve in the solvent, but becomes flocculent and floats on the surface of the solvent or in the solvent, or precipitates in the lower layer of the solvent.
  • Patent Document 1 JP-A-2000-44724
  • Patent Document 2 Japanese Patent No. 3281336
  • Patent Document 1 various additives including ethylene glycol are described. However, these additives are merely added to adjust the solubility, the boiling point, and the flash point. Not intended to act as a defoaming shrinkage agent
  • the solvent composition proposed in Patent Document 2 is a mixture of alcohol and TEA mixed with water or a mixture of alcohol and water mixed with water.
  • TEA is indispensable as one component of the additive
  • the addition of water from the beginning is indispensable. 8-40 parts by mass relative to parts by mass.
  • TEA is one of 102 hazardous substances specified by the Ministry of Health, Labor and Welfare. Due to its harmfulness, there has been a move to refrain from using automotive coolants that have been widely used for some time, such as recently becoming amine-free. TEA is absorbed from the skin and irritates mucous membranes and eyes. There are some safety issues such as some reports of carcinogenicity.
  • the styrofoam defoaming shrinking agent used in Patent Document 2 has a dibasic acid ester as a main component, and contains EG and TEA as additives.
  • the boiling point of each component is DB E power S196-225. C, EG power S197 Q C, Ding EA power S360 Q C.
  • DBE Di Basic Ester
  • S S.
  • DuPont's DBE is a mixed ester solvent of dimethyl adipate, dimethyl glutarate, and dimethyl succinate. It has properties such as high boiling point, low toxicity, and excellent resin dissolving power. Used for a wide range of applications. Recently, it has been increasingly used as a substitute for chlorine-based solvents because of its low environmental impact and excellent safety.
  • TEA TEA
  • the generated gel contains a large amount of water in the additive and has a very high viscosity, which hinders the operation of the separation and regeneration plant. Specifically, it is necessary to supply a gel whose viscosity has been uniformly adjusted to a centrifugal thin-film evaporator, and the additive is a mixture of alcohols and water described in Patent Document 2 and is a polystyrene foam defoaming and shrinking agent. In the case of the gel produced in the above, it takes a very long time to adjust the viscosity. Furthermore, most of the styrofoam to be recycled has foreign matter attached to it, so a foreign matter separating step in the plant is required. If the gel has a high viscosity, it will cause problems. The process of the separation and regeneration plant can be handled by providing a dehydration process to remove such water, but it cannot avoid high cost and long time.
  • the present invention does not use TEA, which may be harmful, as an additive, and also eliminates the detrimental effect of adding a large amount of an additive containing water from the beginning. It is an object to provide an agent and a defoaming shrinkage method.
  • the additives are glycols such as EG and PG without using TEA. These additives can be used alone, and have a hygroscopic property to take in moisture in the atmosphere, which is a key defoaming and shrinking agent for styrofoam, in order to maintain their effects for a long time.
  • a first configuration of the present invention is a defoaming shrinking agent that, when brought into contact with styrofoam, causes defoaming shrinkage without dissolving the styrofoam, and is a dibasic acid ester-based styrofoam dissolving agent.
  • Defoaming and shrinking agent for styrene foam which is a material that is mixed with water and has a hygroscopic property, in which an additive is dissolved. It is.
  • the second configuration of the present invention is based on 100 parts by mass of the dibasic acid ester-based styrofoam dissolving agent, 3 to 7 parts by mass when the additive is ethylene glycol, 3 to 15 parts by mass when the additive is propylene glycol, In the case of a mixture of both, it is a defoaming and shrinking agent for the foamed polystyrene of the first configuration dissolved in 3 to 15 parts by mass.
  • the concentration of the additive in this way, the amount of water to be finally absorbed can be kept at 0.1 to 5%, which is optimal for defoaming and shrinking styrene foam.
  • a third structure of the present invention is the styrene foam defoaming and shrinking agent according to the first structure, wherein the mass ratio of ethylene glycol to propylene glycol in the mixed additive of ethylene glycol and propylene glycol is 1:99 to 99: 1. It is.
  • a fourth configuration of the present invention is a defoaming shrinking agent that is defoamed and shrunk by dissolving the styrofoam by being brought into contact with the styrofoam.
  • 3 to 7 parts by mass of ethylene glycol as an additive is dissolved in water, and while the moisture in the atmosphere is gradually taken in due to the hygroscopicity of the ethylene glycol, the water mass percentage in the defoaming shrinkage agent is 0.1%.
  • Styrofoam defoaming / shrinking agent that keeps within the range of 5% and maintains the defoaming / shrinking effect of Styrofoam over a long period of time.
  • the concentration of the additive in this manner, the amount of water finally absorbed can be kept at 0.15%, which is optimal for defoaming and contracting styrene foam, Also defoaming shrinkage It is possible to prevent a significant decrease in the volume reduction rate by suppressing the decrease in the concentration of the agent, and also to shorten the viscosity adjustment of the polystyrene reduced volume in the separation and regeneration plant, and facilitate the foreign matter separation and evaporation steps.
  • the dibasic acid ester-based styrofoam dissolving agent 100 is used so that the mass ratio of ethylene glycol and water in the defoaming shrinkage agent changes in the range of 99: 1 to 30:70.
  • a sixth configuration of the present invention is a defoaming shrinking agent that is defoamed and shrunk by dissolving the styrofoam by bringing it into contact with styrofoam. 3 to 15 parts by mass of propylene glycol as an additive are dissolved in water, and the moisture content of the defoaming shrinkage agent is reduced to 0.1 to 5 while gradually taking in moisture from the atmosphere due to the hygroscopicity of the propylene dalicol. %, And is a defoaming / shrinking agent for styrofoam, which has a defoaming / shrinking effect of styrofoam over a long period of time.
  • the concentration of the additive in this way, the amount of water finally absorbed can be kept within 0.1-5%, which is optimal for defoaming and shrinking styrene foam.
  • the volume reduction rate is prevented from remarkably decreasing.Furthermore, the viscosity adjustment of the polystyrene reduced volume in the separation and regeneration plant is shortened, and the foreign matter separation and evaporation processes are facilitated. be able to.
  • the mass ratio of propylene glycol to water in the defoaming shrinkage agent is 99:
  • the dibasic acid ester-based polystyrene foam dissolving agent is a defoaming shrinkage agent for foamed polystyrene having a sixth configuration in which 300 parts by mass of propylene glycol is dissolved in 15 parts by mass so as to be in the range of 30:70. It is.
  • the concentration of the additive in this way, the amount of water finally absorbed can be reduced by the styrofoam. It can be kept between 0.1-5%, which is the best for defoaming shrinkage of a unit. This makes it possible to shorten the adjustment of the viscosity of the polystyrene volume-reduced material in the regeneration plant, and facilitate the foreign matter separation and evaporation processes.
  • An eighth configuration of the present invention is a defoaming shrinking agent that, when brought into contact with styrofoam, causes defoaming shrinkage without dissolving the styrofoam,
  • the concentration of the additive in this way, the amount of water finally absorbed can be kept within 0.1-5%, which is optimal for defoaming and shrinking styrene foam.
  • the volume reduction rate is prevented from remarkably decreasing.Furthermore, the viscosity adjustment of the polystyrene reduced volume in the separation and regeneration plant is shortened, and the foreign matter separation and evaporation processes are facilitated be able to.
  • the ninth structure of the present invention provides a dibasic acid so that the mass ratio of the ethylene glycol and propylene glycol mixed additive and water in the defoaming shrinkage agent changes in the range of 99: 1 to 30:70.
  • Eighth structural polystyrene foam dissolving agent is a defoaming / shrinking agent for styrofoam foam of the eighth configuration in which 3 to 15 parts by mass of a mixed additive of ethylene glycol and propylene glycol is dissolved in 100 parts by mass.
  • the concentration of the additive in this manner, the amount of water finally absorbed can be kept at 0.15%, which is optimal for defoaming and contracting styrene foam,
  • the reduction in the concentration of the defoaming shrinkage agent is suppressed to prevent a significant decrease in the volume reduction rate, and furthermore, the viscosity adjustment of the polystyrene reduced volume in the separation and regeneration plant is shortened, and the foreign matter separation and evaporation steps are facilitated. Can be.
  • a tenth structure of the present invention is the styrofoam defoaming shrinkage agent of any of the above structures. This is a method for defoaming and shrinking styrofoam, which is characterized in that defoaming and shrinking without dissolving styrofoam by contacting with styrofoam.
  • This defoaming shrinkage method eliminates the harmful effects of not using TEA, which may be harmful, as an additive, and adding a large amount of an additive containing water from the beginning.
  • a defoaming shrinking agent which is defoamed and shrunk by dissolving the styrofoam by bringing it into contact with styrofoam, wherein the dibasic acid ester-based styrofoam dissolving agent has Is dissolved in water, and the additive is mixed with water and is hygroscopic ethylene glycol, propylene glycol or a mixture of both.
  • the quality of the regenerated polystyrene pellets can be improved.
  • the present inventor did not use TEA, minimized the reduction in volume reduction rate (the mixing ratio of the additives was reduced as much as possible), had little effect on plant operation, and had the effect of floating the gel.
  • the following additives have been found by conducting research on those having them.
  • the present invention is a defoaming / shrinking agent for styrofoam obtained by adding EG, PG or a mixture of both, which is mixed with water to a dibasic acid ester-based styrofoam dissolving agent and has a hygroscopic property.
  • DBE Di Basic Ester
  • DM E-1 Di Methyl Ester
  • EG and PG which are highly hygroscopic, are desirable among glycols.
  • Each has a boiling point of 197 ° C and a PG of 188 ° C, higher than that of water and lower vapor pressure, so that it can remain in the solvent as an additive for a longer time.
  • Both EG and PG have the effect of floating the gel as an additive, and do not require the addition of key water from the beginning, unlike the styrene foam defoaming shrinking agent disclosed in Patent Document 2. .
  • the water concentration is preferably 0.1 to 5%.
  • the additive concentration for equilibrium between water absorption and evaporation is 3-7 parts by mass of EG and 3-15 parts by mass of PG per 100 parts by mass of dibasic acid ester-based styrofoam defoaming shrinkage agent.
  • the mixture of the two is 3 to 15 parts by mass.
  • the concentration exceeds the above-mentioned range, a significant decrease in volume reduction rate due to a decrease in the concentration of the styrofoam defoaming shrinkage agent and an increase in the viscosity of the gel to be produced may hinder plant operation. Thereby, the above range was obtained.
  • the defoaming shrinkage agent for styrofoam of the present invention is prepared by mixing and stirring EG, PG or a mixture of both additives with a dibasic acid ester-based styrofoam dissolving agent. Since the solubility of EG in the dibasic acid ester-based styrofoam dissolving agent is relatively small at about 7% by mass, careful stirring is required after mixing, but simple stirring is sufficient since PG dissolves arbitrarily.
  • EG and PG have strong hygroscopic properties themselves and must be kept in contact with air, such as drums and poly tanks, before storage as an additive, so as not to reduce the volume reduction rate of Styrofoam. It is desirable to use one with a lid to avoid the problem.
  • Each stock solution was arbitrarily mixed with water. From the results of the experiments so far, the mass increase due to water absorption reached a maximum of 50% by mass. Due to long-term storage and frequent opening and closing of the lid, a large amount of moisture is absorbed. As long as the mass ratio of EG, PG to water and the mass ratio of EG, PG mixed additive to water are in the range of 99: 1 to 30:70, they can be used as additives without any problem.
  • EG used in the present invention is
  • the styrofoam shrinkage agent comes into contact with the styrofoam, so that the styrofoam cannot be dissolved. It swells, breaks the cell walls of the bubble cells, releases the gas contained in the bubble cells, destroys the foam structure, and forms a dough-like polystyrene gel, which floats on the surface of the solvent or in the solvent, or the lower layer of the solvent Settles down.
  • the defoamed and contracted styrofoam itself is separated and present in the solvent composition.However, depending on the method of collecting and acquiring the styrofoam itself, the styrofoam floats on the surface of the solvent composition, floats in the solvent composition, or is dissolved in the solvent composition. Or settle down in the lower layer.
  • the additive is EG
  • the gel formed always forms on the surface of the solvent composition.
  • PG When PG is used as an additive, if 3-15 parts by weight of PG is mixed with 100 parts by weight of the dibasic acid ester-based styrofoam dissolving agent, the resulting gel will float on the solvent surface or in the solvent depending on the mixing ratio. Or settles in the lower layer of the solvent.
  • Styrofoam to be recycled occasionally contains foreign matter having a large specific gravity, such as sand and metal, which is a great obstacle in the recycling process. It is desirable that the gel be suspended on the surface of the solvent or in the solvent.
  • styrene foam is added to a dibasic acid ester-based styrene foam dissolving agent. And dissolve the polystyrene in the solvent, and then mix and stir the additive of the present invention to float the gel on the surface of the solvent composition, float the gel in the solvent composition, It can be settled below the material.
  • This method is useful when a large amount of foreign substances (sand, concrete, metals, etc.) having a higher specific gravity than the solvent adhere to the styrofoam and a high-purity gel is obtained by removing the foreign substances as much as possible.
  • the volume reduction rate of these styrofoam defoaming shrinkage agents increases as the temperature increases, but at the same time, odors and vapors may be generated due to evaporation of the solvent. Therefore, the operating temperature is preferably in the range of 20 to 40 ° C. desirable. Conversely, as the temperature decreases, the volume reduction rate gradually decreases, and when the temperature falls below 10 ° C, almost no volume reduction capability is achieved. Therefore, when the temperature is low in winter, it is advisable to use an electric heater or the like to heat and adjust the temperature.
  • the present invention does not use TEA, which is considered to be harmful, and eliminates the adverse effects of adding a large amount of an additive containing water from the beginning. It can be used as a compression method.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Agent antimousse et de rétraction pour le polystyrène expansé qui évite d'utiliser la triéthanolamine (TEA) qui est redoutée comme additif et résout l'inconvénient d'ajout d'une grande quantité d'additif contenant de l'eau depuis le départ et un procédé appropiré de moussage et de rétraction du polystyrène. Il est prévu un agent antimousse et de rétraction pour le polystyrène expansé capable d'effectuer le démoussage sans dissolution par contact avec le polystyrène, agent de démoussage et de rétraction qui comprend un résolvant de polystyrène expansé d'ester d'acide dibasique ayant un additif, l'additif étant du glycol d'éthylène, du glycol de propylène ou un mélange en tant que matériau miscible à l'eau et hygroscopique. Etant donné que l'additif est utilisé à un point d'ébullition inférieur à celui de la TEA, le degré de récupération dans une usine de régénération séparation peut être augmenté et la qualité des pastilles de polystyrène peut être optimisée.
PCT/JP2005/002009 2004-02-26 2005-02-10 Agent antimousse et de retraction pour le polystyrene expanse et procede de demoussage et de retraction du polystyrene expanse Ceased WO2005082987A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004051945A JP3786943B2 (ja) 2004-02-26 2004-02-26 発泡スチロールの脱泡収縮剤および脱泡収縮方法
JP2004-051945 2004-02-26

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WO2005082987A1 true WO2005082987A1 (fr) 2005-09-09

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000129030A (ja) * 1998-10-21 2000-05-09 Ishikawajima Harima Heavy Ind Co Ltd 発泡ポリスチレンの減容処理方法
JP2001106824A (ja) * 1999-10-04 2001-04-17 Mitsugi Isome 発泡ポリスチレン処理剤およびその製造方法ならびに発泡ポリスチレン回収方法および回収装置
JP2001213996A (ja) * 2000-02-01 2001-08-07 Ckd:Kk ポリスチレン発泡材の減容剤および該減容剤を用いてのポリスチレン発泡材の処理方法並びに該減容剤を用いてのポリスチレン発泡材の処理装置
WO2002038660A1 (fr) * 2000-11-07 2002-05-16 E. I. Du Pont De Nemours And Company Procede d'affaissement et de recyclage de la mousse de polystyrene
WO2002038659A2 (fr) * 2000-11-08 2002-05-16 E. I. Du Pont De Nemours And Company Esters d'acide organique dibasique/systeme de cosolvant pour l'affaissement d'un polystyrene alveolaire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000129030A (ja) * 1998-10-21 2000-05-09 Ishikawajima Harima Heavy Ind Co Ltd 発泡ポリスチレンの減容処理方法
JP2001106824A (ja) * 1999-10-04 2001-04-17 Mitsugi Isome 発泡ポリスチレン処理剤およびその製造方法ならびに発泡ポリスチレン回収方法および回収装置
JP2001213996A (ja) * 2000-02-01 2001-08-07 Ckd:Kk ポリスチレン発泡材の減容剤および該減容剤を用いてのポリスチレン発泡材の処理方法並びに該減容剤を用いてのポリスチレン発泡材の処理装置
WO2002038660A1 (fr) * 2000-11-07 2002-05-16 E. I. Du Pont De Nemours And Company Procede d'affaissement et de recyclage de la mousse de polystyrene
WO2002038659A2 (fr) * 2000-11-08 2002-05-16 E. I. Du Pont De Nemours And Company Esters d'acide organique dibasique/systeme de cosolvant pour l'affaissement d'un polystyrene alveolaire

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JP2005239891A (ja) 2005-09-08

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