KR100378672B1 - Volume reducing constriction of firing polystyrene which does no harms to nature environment - Google Patents

Abstract

According to the present invention, in the volume reduction shrinkage agent of expanded polystyrene, which has high safety, very low toxicity, extremely low risk of fire, and is easy to transport and store, when the solvent comes into contact with the expanded polystyrene, It provides a volume reduction shrinkage agent of expandable polystyrene that is shrinkable while separating.

According to the invention, torumarin is immersed in a solution consisting of esters of dibasic acids, for example any of dimethyl glutarate, dimethyl azipine and dimethyl succinate, or a combination thereof, thereby ethylene glycol and triethanolamine Or a solvent in which ethylene glycol, triethanolamine and torumarin powders are mixed, a gel-like substance in which a foamed film of expanded polystyrene collapses when it is dispersed or submerged in expanded polystyrene, or a gelled substance suspended in a solution. There is provided a foamed polystyrene volume reduction shrinkage agent which is harmless to the natural environment, which is formed in a transportable state and recycles the expanded polystyrene and recycles the volume reduction shrinkage agent of the present invention.

Description

Volume reducing constriction of firing polystyrene which does no harms to nature environment}

The present invention relates to a method for recycling a solvent and a foamed polystyrene that enables volume reduction shrinkage and recycling of foamed polystyrene, and has high stability in working environment due to the use of esters of trimarin and dibasic acid, and toxicity. It is extremely weak, extremely low risk of fire, easy to transport and store, and is a volume reducing shrinkage agent of expanded polystyrene which is harmless to the natural environment.

In terms of industrial waste, the volume reduction of expanded polystyrene was generally heat treatment. However, the volume reduction due to heat treatment has a problem that the physical properties are lowered by heat shrinkage.

A dissolution treatment method has been studied as a volume reduction treatment to replace heat treatment.

The dissolution treatment is helpful in recycling, since the deterioration of material properties is small.

Currently, as a solvent used in the dissolution treatment method, d-limonene is known as a citrus-based essential oil. In addition, styrosorube, which is known to have a smaller risk of transport and fire than d-limonene, is also proposed.

As a solvent of expanded polystyrene, d-limonene has excellent solubility but has a bad odor, and has a low flash point of 48 ° C., thus causing a problem in the working environment, easy decomposition and lacking stability. In addition, d-limonene and other soluble solvents have a property of dissolving in the solvent, requiring large-scale plant equipment to separate the polystyrene and the solvent in recycling.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has high stability in the working environment, and the structure of the polystyrene is also chemically stable. The flash point of the present invention is at least 95 ° C and the boiling point is above 177 ° C. In the present invention, when the expanded polystyrene is placed in the solvent, the foamed membrane is decomposed into a solvent and a polystyrene that starts to shrink while collapsing the bubble membrane, so that it is easily recycled, and no expensive factory equipment is required.

The present invention does not use d-limonene or a volatile compound such as petroleum solvent or terpene, and uses a kind or two or more kinds of specific chemicals classified as esters of aliphatic dibasic acids to treat them safely with trimarins. It is to provide a recovery system for volume reduction shrinkage agent and expanded polystyrene by disintegrating cells of expanded polystyrene with high efficiency. The low flammability of the mixed liquor facilitates the regeneration of the collapsed expanded polystyrene, the stability and ease of handling, and the most important economic transportation for recovery and recovery, even when storing the volume reducing shrinkage agent. The volume reducing shrinkage agent of the present invention has a relatively high boiling point and therefore can be transported safely.

The present invention can facilitate safe and inexpensive transportation by shrinking and reducing expanded polystyrene by water immersion of Trumarin in a liquid mixture of liquid aliphatic dibasic acid ester, ethylene glycol, and triethanolamine. . Materials such as dimethyl glutarate, dimethyl azipine and dimethyl succinate are all effective foam volume reducers. These dibasic acid esters each have activity. As mixtures, materials which are chemically produced commodities for the polymer or textile market are particularly economic. The volume reduction of expanded polystyrene is particularly largely lost by evaporation as an active solvating agent. In the present invention, this problem is solved by a solvating agent having a high boiling point and reducing the volume of the foam in the liquid state.

The present invention is elucidated by introducing a group of chemicals as a volume reduction shrinkage of the expanded polystyrene. Methods using these chemicals are beneficial because they can be safely disposed of without harming the working environment. What is important in the early stages of the study is that any volatile chemical or oil has a relatively low boiling point, causing a large amount of chemical to be lost into the atmosphere, and the cost efficiency of the chemical deteriorates as it loses steam as much as it evaporates. The present invention has not been considered at all because of the high risk and loss of use in conventional vapor phases. Therefore, the present invention discloses all new chemicals. Thus, the mixture of esters of dibasic acid, ethylene glycol, and triethanolamine was purified through Trumarin to prevent loss of chemicals and improve flame safety during volume reduction shrinkage and separation and reprocessing of expanded polystyrene. .

The mixed solution used in the present invention contains an ester of dibasic acid. Aliphatic esters of dibasic acids, for example dimethyl glutarate, dimethyl azipine, and also dimethyl succinate (CAS # 1119-40-0; 62-93-0; 106-65-0) rapidly react with expanded polystyrene, At this time, it acts as a stress reinforcing agent, destroys the bubble wall in the network state subjected to high stress, and then destroys the remaining inter bubble structure. The ester of dibasic acid is different from the steam method which acts on expanded polystyrene by dissolving expanded polystyrene in the vapor of a natural organic compound as it has been used for volume reduction of expanded polystyrene.

Using a mixture of an ester of dibasic acid, ethylene glycol, and triethanol eliminates the situation of massive loss as the d-limonene, which has been used as a volume reducing agent, evaporates, as in the conventional volume reduction and recovery methods. . Until now, the effectiveness of the method has been partially lost in terms of cost due to evaporation of the active ingredient for many applications. The present invention is excellent in cost efficiency because such loss is very small.

In addition, the dibasic acid ester liquid mixture of the present invention has a high flash point of 75 ° C. or higher due to its structure, for example, and thus has higher safety than conventional solvents and is easy to store, transport and handle.

Currently, solvents that act on expanded polystyrene are mostly chemicals with environmental problems. A group of chemicals, commonly referred to as isoprenoids or terupene compounds, contain naturally derived compounds that are almost environmentally safe, but the placenta of these compounds form a vapor layer under relatively high volatility and at least in the form of waste. Make.

The ester of dibasic acid, ethylene glycol, and triethanolamine of the present invention are sufficiently low in volatility and thus do not form a vapor layer even if they are garbage. By using the volume reduction shrinkage agent of the present invention, the problem that the non-transparent layer formed on the garbage may be destroyed or damaged by an artificial shape or a natural phenomenon, for example, an earthquake, solves the problem that steam is released on a large scale. Can be.

In the patent for activation (US Pat. No. 5,223543) there is d-limonene.

d-limonene was chosen for reasons of cost or volatility, since it was necessary to act quickly because it was scattered over the air exposed area as a chemical activated liquid when used conventionally. It is also included in the use of various liquid volatiles that generate steam over several hours to several days. The present invention significantly reduces the loss of steam, prevents the formation of a vapor layer in the blister waste, and reduces the loss in the reprocessing process, which is usually carried out at a temperature of 270 ° C. or higher, so that the volume reducing agent mainly contains d-limonene. bang.

When the volume reduction shrinkage agent of the present invention is dispersed or penetrated into the expanded polystyrene, the volume reduction shrinkage agent is separated into the volume reduction shrinkage agent and the polystyrene. If the heat treatment equipment has been used so far, reprocessing is no problem at all.

In a particularly suitable embodiment, a mixture of an ester of dibasic acid, ethylene glycol and triethanolamine is poured into an airtight container, and the foamed polystyrene waste is allowed to flow out. This foamed polystyrene waste is usually a fragment of a plate or container made of foamed polystyrene in a restaurant, or a piece of packaging material for food or industrial goods. When the ester mixed solution of dibasic acid adheres to the foamed styrene, the expanded polystyrene is crushed and the volume is drastically reduced. The sticky substance generated at this time is dropped or pumped appropriately into a container and sent to a trash (in this case, the volume is greatly reduced), or it is sent to a reprocessing unit and an ester of dibasic acid as an active substance and ethylene glycol And tri ethanol and polystyrene polymer are collect | recovered. The mixture has a higher transportability since the self-ignition temperature is about 375 ° C and the flash point is about 104 ° C by the closed cup method.

As a second embodiment, dimethyl azifinic acid in a purified form of 90% or more of dimethyl azifinic acid having an average molecular weight of about 173 is used as the mixed liquid. Dimethyl azifinic acid is sprayed at least three times with at least three pounds of all, at least three pounds, ideally four pounds of dimethyl azifinic acid per pound of expanded polystyrene in a container such as a large box full of polyethylene bags. The mixture of foam and chemicals is preserved in the container or bag and the dimethyl azifinate is safe for transport due to the high flash point of the solvent, and the foam in the mixture is safe for transport because the solvent and the polymer dissolved in the solvent are low toxicity. Continue to dissolve.

In a third aspect, in the second aspect, dimethyl azipine acid is heated to a temperature of at least 150 ° F. before being sprayed onto the expanded polystyrene.

In a fourth aspect, the heated polydimethyl azifinate is hot and foamed polystyrene floating in the first sprayed solvent and polystyrene solution without dissolving the heated dimethyl azifinic acid of the third aspect from the top or front side of the vessel. It is sprayed onto the foam for the first contact with.

In the fifth embodiment, the mixture of foam, solvent and solvent / polymer solution is added with mechanical agitation force to withstand sufficient mixing and to give a kneading action to prevent the undissolved foam of the polymer from agglomeration. The solvation of dimethyl phosphate is higher.

As a slightly unfavorable form in the sixth embodiment, dimethyl ester of glutaric acid is used at a concentration of at least 95% in a mixed solution of other dibasic acid esters. This ester is also a good solvating agent for expanded styrene, but slightly less active than azipine acid ester. The previous embodiment using a lot of the dimethyl azifinic acid may be employed even when the glutaric acid dimethyl ester is large. In each of the above examples, the embodiments can be further developed by substituting azipine acid esters with glutaric acid esters.

A seventh less preferred but functional embodiment is that succinic dimethyl ester, ie succinate dimethyl, may be substituted for dimethyl azipic acid in the third to sixth embodiments. Succinate esters are used at a concentration of at least 90% because they have a late dissolution ability, but dissolution time is not a significant cause and is very useful.

In the eighth embodiment, at least two, if possible, esters of three dibasic acids are used with the solvent sprayed onto the foam in the foamed polystyrene. Since the mixed solution of dibasic acid ester is frequently produced as a side flow in the production of azipine acid used for the polymer and the fiber, it is economically important to use it. Such side flows or coproducts often have a composition, but are readily purified in a mixture consisting of up to 20% by weight of dimethyl succinate and the remainder of the dibasic acid mixture of dibasic acids of glutaric acid and azipic acid. It is possible to do This ester mixture is sprayed onto the expanded polystyrene at room temperature or by heating spray, the expanded polystyrene is dissolved by the ester, the foam structure collapses and the volume is reduced. Reducing foam to 80% or more typically requires at least twice as much heated solvent and three times as much room temperature solvent, and is often used more than theoretical amounts to ensure dissolution of all polystyrene materials.

In a ninth embodiment a room temperature or heated dibasic acid ester mixture or in particular purified dibasic acid ester is dispersed in expanded polystyrene and a heater for holding a heating solution which further facilitates dissolution of the foam in the container with the solution of the solvent and polystyrene. It can be dripped at the container in a bottom part or a lower part.

In a tenth aspect, room temperature or heated dibasic acid ester mixtures or particularly purified dibasic acid esters can be sprayed onto expanded polystyrene, and a solution of the prepared and polystyrene can be added dropwise to a vessel, from which the liquid solutions are pumped. It is transported, eventually returning to at least a portion of the solution that is heated to a mixing action that further aids in volume reduction and dissolution of the foam.

When immersion of torumarin in a mixed solution composed of the dibasic acid ester, ethylene glycol and triethanolamine of the present invention for several minutes, the molecular structure of the mixed solution is changed and the volume reduction shrinkage effect of the foamed styrene is more smoothly performed.

Example

Into a dibasic acid ester mixture consisting of 59% by weight of dimethyl glutarate, 19% by weight of dimethyl azifinate and 17% by weight of dimethyl succinate, torumarin was added 5% by weight of the mixture, followed by immersion for 60 minutes. A sweetening agent was prepared containing 5% by weight of ethylene glycol and triethanol amine. In 50 ml of this reducing shrinkage agent, 10 foamed polystyrenes (foaming ratio of about 50 times) of the size of 1 cm each are thrown in, and the time until the foam is completely dissolved is measured. As a result, it is 1 minute and 6 seconds when the temperature of the volume reduction shrinkage agent is room temperature (22 degreeC), and 10 second when it is 56 degreeC. Moreover, as a result of performing it similarly to the above using d-limonene, the dissolution time at room temperature is 1 minute and 4 second, and since 56 is the flash point of d-limonene, it becomes impossible to implement.

As described above, the present invention can safely and efficiently recover the waste foamed polystyrene according to the present invention, and it is possible to separate and recover the volume reduction shrinkage agent and the polystyrene without requiring a large amount of equipment. In addition, there is a great advantage that the polystyrene can be recovered in a chemically stable state.

Claims (6)

Torumarin is immersed in a dibasic acid ester mixed solution consisting of any one of dimethyl glutarate, dimethyl azipine and dimethyl succinate, or a combination thereof, and ethylene glycol and triethanol amine or ethylene glycol and triethanol amine and torumarin A volume reduction shrinkage agent for expanded polystyrene, which is harmless to the natural environment by mixing a solvent in which powders are mixed. 2. The torumarin according to claim 1, wherein the active ingredient of the dibasic acid ester contains 19% by weight of dimethyl azipine acid, and the remaining portion contains 59% by weight of dimethyl glutarate and 17% by weight of dimethyl succinate. A volume reduction shrinkage agent for expanded polystyrene, which is harmless to the natural environment, which is a solution obtained by mixing 5% by weight of a mixed solution and immersing for 60 minutes and mixing 80% of ethylene glycol and 20% of triethanolamine with respect to 5% by weight. delete delete delete delete