JP3281336B2 - Styrofoam defoaming shrinking agent and defoaming shrinking method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a defoaming shrinking agent and defoaming shrinkage method polystyrene foam, solution compositions based on solvent <br/> onset polystyrene foam of an ester-based, especially the used, defoamed contraction without dissolving the polystyrene foam,
The present invention relates to a styrene foam defoaming / shrinking agent and a defoaming / shrinking method which can recover the styrene resin which has been degassed and contracted while being completely separated from the solution composition.

[0002]

2. Description of the Related Art In recent years, with the development of polymer chemistry and its industrial technology, the function and price of plastics have become more and more suitable for user needs, and the production volume has been increasing steadily. As a result, the amount of used plastics disposed of has also increased in proportion. In particular, styrene resin, which is one of the general-purpose plastics, has a variety of uses, but foams of the resin, that is, styrofoam, are used for industrial products, daily necessities, foods, etc. due to their excellent cushioning, heat insulation and moldability. The amount of used plastic that needs to be processed is increasing.

[0003] Disposal of used styrofoam is incinerated or landfilled as the simplest method, but it leads to environmental pollution and wastes resources and energy. Therefore, attempts have been made to recover and reuse the used styrofoam, and the process of collecting, crushing, melting, and pelletizing, collecting, crushing, pyrolyzing, and obtaining liquefied components has been put to practical use. However, in these methods, depending on the case, there may be a quality problem when styrene is reused due to thermal deterioration, etc., there is a problem in the method of using the recovered material, or the apparent specific gravity is extremely small due to the foam. This is not always the best method, as it costs money to transport.

[0004] Therefore, a method is considered in which a good solvent for styrene is used to dissolve and reduce the volume, and then transported, and separated and recovered at a temperature as low as possible in a distillation separation plant. The present inventor has previously proposed the most appropriate solvent composition and the method in the above-mentioned dissolution recovery separation method (Japanese Patent Application No. 11-1).
No. 05722, filed on April 13, 1999). However, although this method eliminates the disadvantages of the conventional recovery method described above, solids to be recovered must be separated by distillation after all, handling of a high-viscosity solution, consumption of heat energy by distillation, Problems such as a long process time remain.

[0005]

DISCLOSURE OF THE INVENTION In view of the above-mentioned problems in the prior art, the present invention provides a solvent composition which is capable of reducing the volume of polystyrene foam without completely dissolving the polystyrene foam, which is advantageous for transportation, separation and recovery. To provide. Another object of the present invention is to provide a method for defoaming and shrinking Styrofoam using a solvent composition that shrinks the volume of the Styrofoam without completely dissolving the Styrofoam and reduces the volume of the Styrofoam for transportation and separation and recovery. .

[0006]

Means for Solving the Problems The present invention has been made as a result of earnest research in order to solve such problems,
The styrene does not dissolve by contact with the styrofoam, but swells appropriately, breaks the cell wall of the cell, releases the gas contained in the cell, destroys the foam structure, and thus makes contact with the styrene foam Have been found to reduce the solvent composition. 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 sediments in the lower layer of the solvent.

[0007] Such solvent composition comprises dissolving the additive of the present invention in a styrofoam solubilizer for an ester-based, the present invention is characterized by degassing contracted by contact with the solvent composition to foam . Additives of the present invention is a mixture or a mixture of alcohols and triethanolamine alcohol to water, aliphatic alcohols or ethylene glycol or propylene glycol while the is alcohol components of the additive matches Zari water and mixed Alternatively, it is a polyethylene glycol containing diethylene glycol and triethylene glycol, a polypropylene glycol containing dipropylene glycol and tripropylene glycol, or a monoalkyl ether of these dialcohols.

[0008] In the present invention, an alcohol and another component are mixed and prepared in advance and used as an additive.
It is also possible to defoaming shrinking agent of the present invention by adding dissolving the additive in an ester-based styrofoam solubilizer. In this case, when the other component is alcohol and one of the components is water, the weight ratio is preferably in the range of 99: 1 to 80:20. In addition, when the other component is ethanolamine with respect to the alcohol as one component in the additive, the weight ratio is preferably in the range of 98: 2 to 75:25. It is also possible to defoaming shrinking agent of the present invention each of the components of course the additive was added dissolved in an ester-based styrofoam dissolving agent so that the component ratio.

[0009] If the defoaming shrinkage agent additive by adding dissolved in an ester-based styrofoam dissolving agent present invention of the present invention, added dissolving the additive relative styrofoam solubilizer solubilizer 100 parts by weight The amount to be added is preferably in the range of 3 to 5 parts by weight when one component of the additive is triethanolamine, and preferably in the range of 8 to 40 parts by weight when one component of the additive is water.

The defoamed and contracted styrene itself is separated and present in the solvent composition. Depending on the method of collecting and acquiring the styrene itself, the styrene is floated on the surface of the solvent composition, suspended in the solvent composition, or suspended in the solvent composition. Since it is necessary to select whether to settle in the lower layer, the state in which the defoamed and contracted styrene is present in the solvent composition is controlled by the relative specific gravity difference between the defoamed and contracted styrene and the solvent composition. The relative specific gravity difference with the solvent composition is the selection of the solvent composition, that is, the type of styrene foam dissolving agent used for the defoaming shrinkage agent of the present invention,
It can be adjusted by the mixing ratio of the additive and the dissolving agent, the selection of the type of alcohol as a component of the additive, the content ratio in the additive, and the like.

[0011] Depending on the volatility of the selected alcohol or ester, the components may volatilize during the recovery operation, changing the appropriate composition of the volume-reducing shrinkage agent and losing the desired function. in the state another feature which is the boiling point in the surface of the compacting shrinkage agent prepared was coated 椰 child oil have light of higher and specific gravity than the compacting shrinkage agent as a surface coating solution, contacting said volume reducing shrinkage agent styrofoam If so, the defoaming shrinkage can be performed in a stable state. Further, there is no change in the function even if the contracting agent is used repeatedly. However, the use of the surface coating solution is not necessarily required by selecting the components of the additive or the esters. The method of the present invention is useful when volatility is unavoidable due to the purpose function setting of the volume-reducing contraction agent of the present invention.

The esters of the present invention are alcoholic esters of aliphatic and aromatic carboxylic acids, and include various alcohols such as acetic acid, propionic acid, butyric acid, oxalic acid, succinic acid, adipic acid, glutaric acid, benzoic acid and phthalic acid. Esters can be mentioned as examples.

[0013] alcohols of the present invention, good water and mixed Zari suit fatty alcohols. Fatty alcohol is a general formula C _n H _2n + compound represented by ₁ OH, the alcohol residue is a primary, secondary,
Either grade or tertiary may be used. Further, glycols such as ethylene glycol and propylene glycol can also be used. Further diethylene glycol, water-soluble polyethylene glycol such as triethylene glycol or dipropylene glycol, water-soluble polypropylene glycol such as tripropylene glycol,
Alternatively, monoalkyl ethers of these dialcohols may be used.

The triethanolamine used in the present invention is a compound represented by the chemical formula N (CH ₂ CH ₂ OH) ₃ and may be of a purity synthesized by an ordinary industrial technique.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, detailed description of the present invention by the real施例. However, the structures, shapes, relative arrangements, and the like of the substances described in the examples are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified.

[0016]

EXAMPLE 1 25 parts by weight of water was mixed with 100 parts by weight of ethanol to prepare aqueous ethanol as an additive of the present invention. 10 parts by weight of the previously prepared aqueous ethanol is mixed with 100 parts by weight of dimethyl adipate to prepare a solution composition which is the defoaming shrinkant of the present invention. Spray a sufficient amount of this solution composition, that is, the defoaming shrinkage agent of the present invention on a polystyrene foam used for packaging an electric product in a suitable container, or take an appropriate amount of this defoaming shrinkage agent in a container, When immersed, the styrofoam shrinks immediately, becomes flocculent and floats in the defoaming shrinkage agent. The suspended styrene was easily filtered off from the defoaming shrinkage agent with a stainless mesh.

The styrene thus obtained, which still contains a slight amount of a defoaming shrinkage agent, is heated in a vacuum vessel to remove the remaining volatile components, whereby solid styrene is obtained. The defoaming shrinkage agent separated by filtration was colorless and transparent.

However, as the number of subsequent times increased, the adhesiveness of the floating styrene increased and the filterability deteriorated, such as sticking to the stainless steel mesh. When the floating styrene was allowed to stand for several days without being filtered off, the flocculent styrene dissolved in the liquid layer and became completely opaque but became completely more. However, when 10 parts by weight of coconut oil is added to 100 parts by weight of the defoaming contraction agent of the present invention, the coconut oil becomes a layer on the surface of the defoaming contraction agent. When this two-layer mixture was used in the recovery operation, the life expectancy of the effect of the present invention was significantly extended.

[0019]

Example 2 90 parts by weight of ethylene glycol and 10 parts by weight of triethanolamine are mixed to prepare an additive of the present invention. 5 parts by weight of the above-prepared additive of the present invention is added to and mixed with 95 parts by weight of dimethyl succinate to prepare a defoaming shrinkage agent of the present invention. Spray a sufficient amount of the defoaming shrinkage agent in a suitable container on the styrofoam used for the packaging of the electrical product, or take an appropriate amount of this defoaming shrinkage agent and immerse the styrofoam in the container. In the meantime, it shrinks and becomes flocculent and floats in the defoaming shrinkage agent.
The suspended styrene was easily filtered off from the defoaming shrinkage agent with a stainless mesh. By heating the thus obtained styrene still slightly containing the defoaming shrinkage agent in a vacuum container to remove the remaining volatile components, solid styrene is obtained. The defoaming shrinkage agent separated by filtration was colorless and transparent. The defoaming and shrinking agent obtained by filtration kept the intended function of the present invention for a long period of time even when the operation of the present example was repeated and the method of the present invention was carried out. Although the floating styrene was left for several days without being filtered off, the floating styrol was maintained in a flocculent state, and the styrene could be easily recovered in the same manner as described above.

[0020]

As described above, according to the present invention, the defoaming shrinkage is achieved without causing the styrofoam to dissolve,
Thus, it can be separated from the easily used defoaming shrinkage agent,
Moreover, this state is stable for a long time. Thereby, the styrene foam can be recovered by a free process schedule without using a complicated recovery process and with low energy consumption.

Claims (13)

(57) [Claims] By contacting with 1. A onset polystyrene foam, without dissolving the styrene, a defoaming shrinking agent for defoaming shrinkage requiring dissolving the additives in an ester-based onset polystyrene foam dissolving agent , a mixture of the additives there alcohol compound and triethanolamine, while in a alcohol component of the additive is water and mixed Zari suit fatty alcohols, or ethylene glycol or propylene glycol or diethylene glycol and triethylene polypropylene glycol, or defoaming shrinking agent of polystyrene foam monoalkyl ethers of these dialcohols comprising polyethylene glycol or dipropylene glycol and tripropylene glycol glycols. In the composition according to claim 2, wherein said additive, the weight ratio of A alcohol and triethanolamine 98: 2 to 75:
2 5 a defoaming shrinking agent of polystyrene foam of claim 1, wherein. Wherein an ester-based onset foam polystyrene dissolving agent 100
Defoaming shrinkage agents polystyrene foam of 請 <br/> Motomeko 1 wherein dissolved 3 to 5 parts by weight of the additive based on the weight parts. By wherein contacting with Styrofoam, without dissolving the scan Chiroru, Ru was defoamed shrinkage
A defoaming shrinking agent, an ester-based styrofoam dissolving agent
8 to 40 parts by weight of the additive dissolved in 100 parts by weight
Wherein the additive is a mixture of alcohols and water,
The weight ratio of the alcohols to water is 99: 1 to 80: 2.
0 (where 99:. Except one case), and one in which alcohols of the components of the additive is water and mixed Zari suit fatty alcohols, or ethylene glycol or propylene glycol or diethylene glycol and triethylene glycol polypropylene glycol, or defoaming shrinking agent of polystyrene foam monoalkyl ethers of these dialcohols comprising polyethylene glycol or dipropylene glycol and tripropylene glycol containing. 5. The method according to claim 5 , wherein
Defoaming shrinkage without dissolving styrene
A defoaming shrinking agent, ester-based Styrofoam dissolving agent
8 to 40 parts by weight of the additive dissolved in 100 parts by weight
Wherein the additive is a mixture of alcohols and water,
Alcohol, one of the additives, mixes with water
Suitable aliphatic alcohol or ethylene glycol or
Is propylene glycol or diethylene glycol
Glycolate containing triethylene glycol and triethylene glycol
Or dipropylene glycol and tripropylene glycol
Or polypropylene glycol containing polyester
Monoalkyl ethers of alcohols foamed Suchiro <br/> Lumpur defoaming shrinking agent (provided that water to defoaming shrinking agent total amount
Excluding those with a proportion of 0.1 wt% or more and 0.8 wt% or less
Good. ). 6. The weight ratio of alcohols to water is 99: 1.
Defoaming shrinkage agents polystyrene foam of claim 5 wherein the optimum 80:20. 7. An ester-based polystyrene foam dissolving agent
Mixture of alcohols and triethanolamine as additives
The compound is dissolved to prepare a defoaming shrinking agent, and the defoaming shrinking agent is
By contacting the foam with styrofoam,
Degassing and shrinking without dissolving
This is a defoaming shrinkage method for styrofoam, and one of the components of the additive is
Alcohol is mixed with water
Or ethylene glycol or propylene glycol
Coal or diethylene glycol and triethylene glycol
Polyethylene glycol or dipropyl containing recall
Polypropylene containing glycol and tripropylene glycol
Propylene glycol or a model of these dialcohols
Degassing shrinkage method Foam is-alkyl ether. 8. The method according to claim 8 , wherein the weight of alcohol and triethanolamine is
Styrofoam so that the quantitative ratio is 98: 2 to 75:25
8. The composition according to claim 7, wherein the composition is dissolved in a dissolving agent.
Defoaming and shrinking method of styrene foam. 9. An ester-based polystyrene foam dissolving agent 100.
Dissolve 3 to 5 parts by weight of the above additives in parts by weight.
The defoaming collection of the styrofoam according to claim 7, characterized in that:
Contraction method. 10. An alcohol and water having a weight ratio of 9
9: 1 to 80:20 (except in the case of 99: 1)
), Adjust the additives by mixing with
8 to 40 parts by weight of the additive in 100 parts by weight of a roll dissolving agent
The defoaming shrinkage agent is prepared by dissolving the defoaming shrinkage agent.
Dissolve styrene by contacting with styrofoam
Foaming characterized by defoaming and shrinking without dissolving
A defoaming shrinkage method for styrene, which is one of the components of the additive
Alcohols that are mixed with water
Or ethylene glycol or propylene glyco
Or diethylene glycol and triethylene glycol
Polyethylene glycol or dipropylene containing coal
Polypropylene containing glycol and tripropylene glycol
Pyrene glycol or mono-alcohols of these dialcohols
Defoaming shrinkage of Styrofoam, an alkyl ether
Law. 11. An additive is prepared by mixing alcohols and water.
Adjusted, 100 parts by weight of ester-based polystyrene foam dissolving agent
8 to 40 parts by weight of said additive is dissolved therein to remove air
(However, the ratio of water to the total amount of
Excluding those of 0.1% by weight or more and 0.8% by weight or less),
By contacting the defoaming shrinkage agent with styrofoam
Defoaming shrinkage without dissolving the styrene
A defoaming shrinkage method for styrofoam.
Alcohol, one of the additives, is mixed with water
Aliphatic alcohol or ethylene glycol
Or propylene glycol or diethylene glycol
Polyethylene glycol containing polyester and triethylene glycol
Coal or dipropylene glycol and tripropylene glycol
Polypropylene glycol containing recall or this
Is a monoalkyl ether of dialcohols
Defoaming shrinkage method for tyrol. 12. The alcohol and water weight ratio is 99: 1.
Dissolve in styrofoam dissolving agent so as to be 80:20
The styrofoam according to claim 11, wherein
Method of defoaming and shrinking of steel. 13. The method according to claim 7, 10 or 11.
In the styrene foam defoaming shrinkage method, the
Coconut oil coated as a surface coating liquid on the surface of a condensing agent
Contacting the defoaming shrinkage agent with styrofoam at
A method for defoaming and shrinking styrene foam.