KR101076011B1 - Fluid gel of polystyrene and manufacturing method thereof, and regenerated polystyrene and molding composite using the same - Google Patents

Abstract

The present invention is used to recycle waste polystyrene used in the beverage container and packaging container of the lactic acid bacteria, and impurities such as water and oil are naturally separated and polystyrene forms a flowable gel by acetone, which is useful for forming a composite molding. The present invention relates to a flowable gel of polystyrene and a method for producing the same, and to regenerated polystyrene and a composite molded product manufactured using the same.

The polystyrene fluid gel according to the present invention is characterized in that the polystyrene fluidized gel of polystyrene formed by plasticization with acetone includes an alkaline substance, and the polystyrene fluid gel is used in waste polystyrene containing water, oil and insoluble miscellaneous materials. By adding and mixing acetone and alkaline substances, moisture and oil are naturally phase-separated and converted into easily removable states, while minimizing the influence of moisture contained in additives added for the purpose of manufacturing composite moldings. It can be usefully used for the preparation of.

Polystyrene, acetone, alkali, moisture, oil, contamination, fluidity, gel, filler

Description

Polystyrene fluid gel and its preparation method, and regenerated polystyrene and composite method using the same

The present invention relates to a polystyrene fluid gel, a method for producing the same, and a regenerated polystyrene and a composite molded product using the same, and more particularly, in the collection and recycling of waste polystyrene collected and used as a packaging container, such as moisture or oil. The impurities are easily separated and the polystyrene plasticized with acetone forms a flowable gel, and the flowable gel of polystyrene which is useful for the production of a composite molded article, a method for producing the same, and a regenerated polystyrene and a composite molded using the same It is about.

Polystyrene is a material that is widely used throughout the industry because of its unique lightness, buffering properties and warmth. In particular, due to the light weight and the advantage of producing a large amount of products with a small amount of raw materials, it is widely used as a disposable packaging container or sanitary ware.

However, polystyrene, like other synthetic resins, is recognized as a leading cause of environmental pollution as a biodegradable substance, and there are social movements such as regulation on the use of disposable devices and encouraging reuse, and technology development for recycling it is actively underway.

The method of recycling polystyrene is to recover heat energy through incineration, to lower molecular weight through decomposition, to melt using heat, to manufacture recycled materials such as artificial wood, building molding, and frame frames, and to dissolve by using a solvent. Or a method for producing a coating agent and the like have been developed.

However, each of the above methods is problematic. In particular, in the method of dissolving polystyrene using a solvent to use a liquid substance, the residual amount of solvent is released to the finally manufactured product, causing indoor air pollution and air pollution. There is a problem that causes secondary pollution.

In addition, when manufacturing products such as artificial wood, building moldings and picture frames after melting using heat, waste polystyrene melted at a high temperature is used first, so that it is impossible to apply a weak additive to heat. Due to the viscosity, it is not easy to separate impurities, and the process of manufacturing recycled products by molding molten polystyrene through molding molds by extrusion method is very sensitive to the type and amount of additives. There is a problem that only high purity waste polystyrene is limitedly applicable due to the problem that it cannot be developed by the technology.

Meanwhile, U.S. Patent No. 6,326,408 discloses a method and an apparatus for converting solid polystyrene into a flowable liquid using acetone or benzene, chloroform, methylene chloride, ethylene tetrachloride, toluene and the like. Compared with other solvents that dissolve polystyrene, acetone acts as a plasticizer of polystyrene and simply expands polystyrene to impart fluidity, so it is easy to completely remove and remove from polystyrene during molding or after molding. Silver viscosity is relatively low, there is an advantage that easy removal of insoluble miscellaneous, there is an advantage in that it is possible to manufacture a valuable fluid gel in practical terms.

By the way, most of the waste polystyrene collected as household waste contains a large amount of one-time containers contaminated with not only insoluble miscellaneous materials, but also various pollutants such as moisture, oil, and soluble miscellaneous products. The method of preparing a fluidized gel into a fluidized gel is difficult to apply immediately when water or oil is contained at a predetermined level or more. That is, when the moisture is contained at a certain level or more, there is a problem in that the plasticizing effect due to acetone is sharply dropped to make the fluid gel itself impossible. In addition, the oil is dissolved in acetone and mixed in the flowable gel, but there is a problem that it is not easy to remove it. Therefore, even when the composite product is manufactured using the contaminated polystyrene gel, there is a problem such as stickiness caused by post-contamination of contaminants, so it is difficult to expect the utilization in practical terms.

Therefore, the development of a technology for immediately recycling the waste polystyrene containing the collected water and oil is required.

The present invention has been made to solve the problems of the prior art in the recycling of waste polystyrene as described above, it is possible to simply manufacture using waste polystyrene contaminated with various contaminants such as moisture, oil, etc. It is an object of the present invention to provide a polystyrene flowable gel and a method for producing the same, and a recycled polystyrene resin and a composite molded product produced using the polystyrene flowable gel.

The polystyrene fluid gel according to the present invention for achieving the above object is characterized in that an alkaline substance is contained in the fluid gel made of acetone and polystyrene.

The present invention has been made in order to plasticize waste polystyrene containing some contaminants including water and oil into a flowable gel without removing these contaminants. That is, the plasticization of polystyrene by acetone is significantly slowed to plasticize the polystyrene by acetone even if the acetone contains only about 5% by weight of water, and when contained in more than 10% by weight, plasticization is not achieved at all, water, oil and When acetone is added to waste polystyrene containing miscellaneous matter, the water content of acetone is increased, and thus, plasticization of polystyrene by acetone is not stable.

However, the present invention utilizes a phenomenon in which water which becomes alkaline through the method of mixing waste polystyrene, acetone, and an alkaline substance is incompatible with acetone and polystyrene gel, and is naturally separated into an upper and lower layer, and acetone is added by adding alkali. Moisture dissolved in is removed, and polystyrene is stably plasticized by acetone without mixing with moisture, thereby forming a fluid gel.

The added alkaline substance forms a pH of 12 or higher, such as sodium hydroxide, potassium hydroxide and sodium carbonate, and weakly alkaline substances forming a pH below that do not effectively separate moisture from acetone and polystyrene. That is, when the pH of the water is 12 or more, the water is well separated from the acetone, and acetone having a low water content effectively plasticizes the polystyrene to form a flowable gel. These alkalis may be used alone or in combination thereof.

In the state in which the water layer is not separated from the flowable gel of the polystyrene thus produced, 5% by weight or more of the polystyrene flowable gel with respect to the weight of acetone is mixed with the phase separated water. If less than this water is present, it can be effectively plasticized by acetone even without adding an alkaline substance.

Since the added alkaline material is dissolved in water and is present in the water layer, it is naturally separated from the polystyrene fluid gel by separation of the water layer, but a small amount of alkaline material may remain in the fluid gel even after separation of the water layer. The amount of alkaline material remaining in the fluid gel may vary depending on the amount of alkaline material added or the degree of removal of the water layer, but only a small amount of 3% by weight or less with respect to the polystyrene resin component remains, and usually a small amount of less than 1% by weight. Only remains.

Apart from the water layer, the vegetable or animal oil of the oily contaminant of waste polystyrene is subjected to saponification by alkali, separated from the fluid gel of polystyrene plasticized by acetone, and dissolved and collected in the lower water layer.

The flowable gel of polystyrene thus prepared is passed through a filter to remove insoluble miscellaneous material, and then dried to remove acetone to obtain a regenerated polystyrene resin. The regenerated polystyrene may contain less than 3% by weight of alkaline materials compared to polystyrene, and may contain less than 2% by weight of acetone, depending on the degree of drying. Since the regenerated polystyrene is removed from moisture, oil and insoluble matters, it can be recycled to various fields without problems as in the conventional regenerated polystyrene through the molding method by melting or the like.

Meanwhile, the composite molded article using the polystyrene fluid gel according to the present invention is a composite molded article made of polystyrene and a solid filler, and is characterized by containing an alkaline substance and acetone.

The composite molded article to which the solid filler is added can be prepared by putting the solid filler into the above-mentioned polystyrene fluid gel and mixing it uniformly, and then putting it in a mold to press to form a primary shape, and then solidifying by removing acetone. have. The composite molded product thus prepared has a foam structure in which fine bubbles are formed in the polystyrene resin as acetone is evaporated. The composite molded product thus prepared is preferably heat treated at a temperature of 240 ° C. or higher for the purpose of improving surface smoothness, improving strength, or improving water resistance.

On the other hand, in order to prepare a polystyrene fluid gel, acetone may be added at least 40% by weight based on the weight of the polystyrene resin, but in order to have a viscosity suitable for producing a composite molding, the acetone is 70 to the weight of the polystyrene resin It is preferable to include from 200% by weight.

The solid filler may be selected from wood powder, stone powder, metal powder, earth powder, inorganic fibrous material and organic fibrous material, but is not particularly limited.

In particular, the plate-shaped composite molded product made by mixing wood powder can be usefully used for the production of substitutes for wood-based fiber boards such as particle board (PB), medium density fiber board (MDF), wherein the above-mentioned principle As a result, the action of solidifying the polystyrene fluid gel is suppressed, so that the polystyrene gel and the wood powder, which have a constant fluidity, can be uniformly mixed, thereby making it possible to produce a composite molded article having a uniform physical property. In addition, if necessary, an alkaline substance may be further added during mixing of the filler to remove unnecessary impurities such as moisture in the manufacturing process of the composite molding.

As described above, the composite molded product manufactured using the polystyrene fluid gel according to the present invention may have an alkali substance of 3% by weight or less based on polystyrene and 3% by weight or less of acetone based on polystyrene. The residual amount of alkaline material or acetone may vary depending on the working conditions such as the amount of the alkaline material added, the degree of drying, and the type of solid filler. However, solid fillers such as wood flour have the property of absorbing an alkaline component or acetone, and the addition of such solid fillers results in a higher residual amount of alkaline substances and acetone than fluid gels or regenerated polystyrene.

On the other hand, in the method for producing a polystyrene fluid gel according to the present invention, acetone and an alkaline substance are added to and mixed with waste polystyrene containing water, and the water contained in the waste polystyrene is separated, and the polystyrene is plasticized by acetone. It is characterized by having a fluidity.

The acetone and the alkaline material may be added at the same time, the acetone may be added first and then the alkaline material may be added, and the acetone may be added after the alkaline material is added first.

In addition, the alkaline substance, as described above, forms a pH of 12 or more, such as sodium hydroxide, potassium hydroxide, and sodium carbonate, and may be added as it is, but it is more useful in terms of work by dissolving in water and in the form of an aqueous solution.

According to the present invention, since waste polystyrene contaminated with contaminants such as moisture and oil used as a lactic acid bacteria beverage container or packaging container can be regenerated in a simple process, it can greatly contribute to efficient use of resources and prevention of environmental pollution. It works.

In addition, the present invention is relatively easy to handle, use a less harmful acetone, there is no problem in the working environment, acetone has a low affinity unlike the solvents of polystyrene, it is easy to remove when used in the production of a composite molding, environmentally friendly It is useful in that the product can be manufactured.

In addition, it is possible to effectively remove the influence of impurities such as moisture contained in the solid filler such as wood powder, soil powder and the like in the production of artificial wood, there is an advantage that it is possible to stably produce a uniform composite molding.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Comparative Examples 1 to 6: Polystyrene Plasticization of Acetone According to Water Content

6 g of acetone was added to each of the six 500 ml beakers, and then water was added to 0 (Comparative Example 1), 0.5 (Comparative Example 2), 0.6 (Comparative Example 3), 0.7 (Comparative Example 4), and 0.9 (Comparative). Example 5) and 1.1 g (Comparative Example 6) were added and mixed with acetone. 2g each of the expanded polystyrene particles was added thereto, and the collapse time was observed visually.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Water addition amount (g) 0 0.5 0.6 0.7 0.9 1.1 Morphological collapse 23 seconds 34 seconds 50 seconds 58 seconds 3 minutes No form collapse Remarks Volume reduction only until 3 minutes

As a result of judging the time required for plasticization on the basis of the shape collapse time, as shown in Table 1, even if only about 5 parts by weight of water mixed with pure acetone (Comparative Example 2), the plasticization of polystyrene is not smoothly made It was confirmed that the plasticization rate is significantly slowed. In addition, plasticization proceeded only when water of about 9 parts by weight or less was mixed (Comparative Example 5) to form a flowable gel, and when more water was mixed (Comparative Example 6), plasticization of polystyrene was performed even with longer time. It was confirmed that morphological collapse was not achieved and fluid gel could not be formed.

That is, through the above comparative examples, plasticizing polystyrene using acetone to prepare a flowable gel is possible only when there is little water contained, and even if a small amount of water is mixed, the ability of plasticizing polystyrene by acetone is significantly reduced. You can see that.

Comparative Example 7: Preparation of Flowable Gel of Oil-Containing Polystyrene

After putting 5 g of pure acetone into a 50 ml beaker, 1 g of vegetable cooking oil and 4 g of expanded polystyrene particles were added and stirred. The vegetable cooking oil was completely dissolved in acetone and mixed uniformly, and the expanded polystyrene particles were disintegrated and converted into a flowable gel in the same manner as the plasticizing action of pure acetone.

The photo of the obtained polystyrene flowable gel is shown in FIG. 1, and as shown in FIG. 1, the obtained flowable gel was in a state in which oil was completely mixed.

Thus, waste polystyrene containing oil impurity can be prepared as a flowable gel by acetone, but this oil is completely mixed with the polystyrene fluid gel and remains uniformly in the molding because it is not evaporated or separated even during the production of acetone. Done.

Comparative Example 8 Preparation of Flowable Gel of Oil-Containing Polystyrene

 After putting 10 g of pure acetone into a 500 ml beaker, 2 g of animal shortening oil and 8 g of expanded polystyrene particles were mixed. Animal shortening oil was also completely dissolved in acetone and mixed in the same manner as in the vegetable cooking oil of Comparative Example 7, and expanded polystyrene particles were disintegrated and converted into a flowable gel in the same manner as the plasticizing action of pure acetone.

The polystyrene fluid gel obtained at this time is completely mixed with the oil as shown in FIG. However, some floats appear to be due to animal oil.

Example 1 Preparation of Flowable Gel Using Water-Containing Polystyrene and Regenerated Polystyrene Using the Same

5 g of acetone, 4 g of expanded polystyrene particles, and 0.4 g of water were added to a 50 ml beaker, and the state was observed while stirring, and the state after the moisture was taken was shown in FIG. 3. In FIG. 3 and in this state, the expanded polystyrene particles were not softened, and a fluid gel was not produced.

However, when 0.5 g of caustic soda was mixed again, the caustic soda was exothermic and dissolved in water mixed with acetone, and the expanded polystyrene particles were plasticized by acetone to form a flowable gel. At this time, acetone vapor was generated by the exothermic reaction.

The resulting flow gel was photographed and shown in FIG. 4, and as shown in FIG. 4, the water and the flow gel in which caustic solubilized were naturally separated from each other.

On the other hand, the flowable gel layer and the water layer were separated from each other, the water was evaporated from the separated water layer, and the weight of the remaining caustic soda was found to be 0.47 g. From this, it was confirmed that a small amount of caustic soda remained in the flowable gel layer of polystyrene.

In addition, the fluid gel layer from which the water layer was separated was heated to acetone to evaporate to obtain a lumped regenerated polystyrene. As a result of measuring the weight of the regenerated polystyrene, it was found to be 4.07 g, and it was confirmed that the regenerated polystyrene had a small amount of unvaporized acetone with a small amount of alkaline components.

Example 2: Preparation of Flowable Gel Using Water-Containing Polystyrene

Through the same method as in Example 1, except that 0.5 g of potassium hydroxide was used instead of caustic soda, a fluid gel obtained by phase separation with a fluid gel of potassium hydroxide dissolved water and polystyrene plasticized with acetone was obtained.

Example 3: Preparation of a Flowable Gel Using Water-Containing Polystyrene

A polystyrene fluid gel was prepared in the same manner as in Example 1, except that 0.4 g of a 50% aqueous solution of caustic soda was mixed instead of the caustic soda of Example 1. The prepared polystyrene fluid gel was photographed and shown in FIG. 5.

Through this embodiment, it was confirmed that the use of caustic soda solution is relatively less heat generation in the mixing process compared to Example 1 in which caustic soda is directly mixed, thereby reducing the amount of acetone evaporated and lost. .

Example 4 Preparation of Flowable Gel Using Polystyrene Mixed with Water and Oil

6 g of acetone, 3.5 g of water, 1 g of vegetable cooking oil, and 4 g of expanded polystyrene particles were added to a 50 ml beaker and mixed. 1 g of caustic soda solution dissolved at a concentration of 40% by weight was added thereto and mixed.

As a result, a flowable gel in which polystyrene was plasticized was formed as shown in FIG. As shown in FIG. 6, even when a large amount of water and oil are contained, the expanded polystyrene particles are plasticized by acetone to form a flowable gel, which is present in the upper layer, and the vegetable cooking oil is water-resistant by reaction with an aqueous solution of caustic soda. Converted to material, mixed with water and aqueous caustic solution and separated naturally into the bottom of the beaker.

In this example, it was indirectly confirmed that even when using waste polystyrene contaminated with contaminants including a large amount of water and oil, a polystyrene fluid gel plasticized by acetone could be obtained.

Example 5: Preparation of Flowable Gel and Regenerated Polystyrene Using Waste Polystyrene

A: Determination of average residue weight of fermented milk packaging

Thirty fermented milk packaged in a 150 ml polystyrene container was purchased on the market, and ten test subjects were drinking three times as usual, and 30 packaging containers were collected.

The collected container was weighed, washed with water to remove the residual amount of fermented milk remaining inside, and dried at a temperature of 65 ° C. for 12 hours to measure the weight of the packaging container.

The difference between the weight of the first collected container and the weight of the container was determined, and the residual amount of fermented milk remaining in the container after drinking was measured and shown in Table 2.

division 1 time Episode 2 3rd time Tare weight (average of ten people) 8 g 8 g 8 g Fermented milk remaining amount (average of ten people) 1.063 g 0.818 g 0.754 g

As a result, the weight of the fermented milk container of 150ml capacity was 8g, the residual amount of fermented milk remaining in the container after drinking was 0.88g, it was confirmed that about 10% of the fermented milk packaging container remaining in the container.

B: Preparation of Polystyrene Flowable Gel Using Fermented Milk Packaging Container

Meanwhile, 50 polystyrene fermented milk containers collected after drinking were pulverized in a flake state without drying to prepare 366.4 g of waste polystyrene.

20 g of acetone was added to the container containing 10 g of the waste polystyrene flakes, followed by mixing. Then, 5 g of a 25% by weight aqueous solution of caustic soda was added, followed by stirring for 2 hours using a magnetic bar at room temperature. As a result, as shown in Fig. 7, waste polystyrene was plasticized by acetone and converted into a completely flowable gel-like substance, which was present in the middle part, and the saponified milk fat mass and water were separated into the lower portion, and the acetone which was not absorbed was It was on top of the beaker.

Therefore, according to the present invention, it was confirmed that the polystyrene fluid gel could be prepared from waste polystyrene collected on the market, such as fermented milk packaging containers, as raw materials.

C : Preparation of Regenerated Polystyrene Using Polystyrene Flowable Gel

The water and saponified milk fat mass present in the lower layer were removed and filtered to remove insoluble miscellaneous material. The regenerated polystyrene resin was obtained by drying the fluid gel of polystyrene from which impurities were removed through hot air to remove acetone.

Comparative Example 9 Preparation of Polystyrene Flowable Gel Using Fermented Milk Packaging Container

15 g of acetone was added to a container containing 5 g of waste polystyrene flakes prepared in Example 5, and stirred for 10 hours using a magnetic bar at room temperature.

After 10 hours have elapsed, as shown in FIG. 8, as shown in FIG. 8, water and milk fat derived from residual fermented milk are mixed with acetone to increase turbidity of acetone, but polystyrene is not fluidized at all and remains in a solid state. In the presence of a contaminated waste polystyrene containing a large amount of water and oil, it was confirmed that the preparation of a flowable gel of polystyrene using acetone was impossible.

Example 6 Preparation of Homogeneous Mixture Using Polystyrene Flowable Gel and Wood Powder

A: Determination of moisture content of wood flour

After purchasing commercially available dry wood powder for particle board, put it in a 250 ml beaker, weigh it, dry it for 48 hours at a temperature of 65 ° C., and weigh it again to obtain a difference from the weight measured before drying. The moisture content in the wood meal was calculated.

As a result, it was confirmed that commercially available dry wood powder contained about 7 to 8% by weight of water.

B: Preparation of a homogeneous mixture of polystyrene flowable gel and wood flour

1 g of aqueous potassium hydroxide dissolved at a concentration of 40% by weight was added to 8 g of polystyrene fluid gel obtained by mixing 9 g of acetone and 9 g of polystyrene, and mixed uniformly. To this mixture, 8 g of the dry wood powder for commercial particle board manufacture was added and mixed uniformly using a reagent spoon.

9 shows a state in which the mixing is performed. Solidification of the polystyrene fluid gel did not occur during the mixing process, and as shown in FIG. 9, a mixture of wood flour and the polystyrene fluid gel was uniformly formed. In addition, it was confirmed that a small amount of phase separated alkaline water present in the lower portion of the beaker.

Comparative Example 10 Preparation of a Mixture Using Polystyrene Flowable Gel and Wood Powder

Using a dry wood powder for commercial particle board 8g to prepare a homogeneous mixture using a polystyrene fluid gel and wood flour in the same manner as in Example 6. However, 1 g of aqueous potassium hydroxide solution dissolved at a concentration of 40 wt% was not added.

In the process of mixing using a reagent spoon, a part of the polystyrene fluid gel caused solidification, which is seen as the effect of water emanating from the wood meal, and thus uniform mixing was not possible. The state after completion of mixing is shown in FIG. 10. The white part of FIG. 10 is solidified polystyrene, and it can be seen that wood powder that is not properly mixed is present in the vicinity.

Example 7: Preparation of Composite Molds Using Polystyrene Flowable Gel and Wood Powder

A: Preparation of Flowable Gel Using Waste Polystyrene

100 kg of polystyrene products (disposable products such as lactobacillus beverage containers, cups and plates, and mixtures of children's toys) were purchased at the household waste recycling site, and pulverized into flake particles through a grinder, and left for 72 hours. .

30 g of acetone was added to a 250 ml mixer, and then 1 g of 10% by weight aqueous solution of caustic soda was added, followed by stirring using a stirrer, and 40 g of waste polystyrene in a flake state, optionally taken, was stirred for 60 minutes.

 Thereafter, the flowable mixture was placed in a fractionation flask and allowed to stand for 30 minutes to stabilize, thereby obtaining a purified polystyrene flowable gel by removing a phase-liquid aqueous liquid at the bottom. The pH of the bottom phase separated material thus obtained was determined to be 13.

B: Mixing of Dry Wood Powder and Polystyrene Flowable Gel

50 g of the polystyrene fluid gel obtained in step A was added to a 250 ml beaker, and 28 g of dry wood powder was added and mixed, followed by stirring for 3 minutes to obtain a uniform mixture.

C: Molding of the composite molding of polystyrene fluid gel and wood flour

After the homogeneous mixture obtained in step B was inserted into a mesh frame having a thickness of 1 cm, the mixture was put into a constant temperature water bath containing hot water at 95 ° C. together with the mesh frame to remove acetone and formed into a plate-shaped composite molding. At this time, the polystyrene was stably bonded to the mixed wood powder by foaming with acetone evaporation, it was also easy to remove the mesh frame.

 D: drying of the composite molding

The plate-shaped composite molded product obtained in step C was introduced into a drier and dried at a temperature of 60 ° C. for 4 hours to obtain a composite molded product from which moisture was removed. As a result of measuring the weight of the dried composite molding, it appeared that 61g, it was confirmed that the composite molding can be dried in a state containing less than 5% moisture at about 4 hours drying at a temperature of 60 ℃.

E: Foundation

As a result of cutting the edge of the dried composite molding using a general woodworking saw, it could be seen that the same as normal wood, particle board, MDF, and the like can be cut.

F: surface heat treatment

The composite molded product cut in step E is compressed for 1 minute using a molding press heated to a temperature of 260 ° C., and then cooled to 80 ° C., thereby increasing the surface smoothness as shown in FIG. 12. Could get

1 is a photograph of a polystyrene flowable gel prepared in Comparative Example 7.

2 is a photograph of a polystyrene flowable gel prepared in Comparative Example 8.

Figure 3 is a photograph showing the state before the addition of caustic soda in Example 1.

4 is a photograph of a polystyrene flowable gel prepared in Example 1. FIG.

5 is a photograph of a polystyrene flowable gel prepared in Example 3. FIG.

6 is a photograph of a polystyrene flowable gel prepared in Example 4. FIG.

7 is a photograph of a polystyrene flowable gel prepared in Example 5. FIG.

FIG. 8 is a photograph of the resultant which does not form a polystyrene flowable gel in Comparative Example 9. FIG.

9 is a photograph of a mixture of polystyrene fluid gel and wood flour uniformly mixed in Example 6. FIG.

FIG. 10 is a photograph of a polystyrene mixture heterogeneously mixed with wood flour prepared in Comparative Example 10 and partially solidified with a polystyrene flowable gel. FIG.

Figure 11 is a post-cut photograph of the composite molding prepared in Example 7.

12 is a photograph after the surface heat treatment of the composite molding prepared in Example 7.

Claims (15)

A polystyrene fluid gel comprising acetone and a polystyrene fluid gel containing an alkaline substance forming a pH of 12 or more. The polystyrene fluid gel of claim 1, wherein the alkaline material contains 3% by weight or less (excluding 0%) of the polystyrene. The method according to claim 1 or 2, wherein the alkaline substance is any one selected from sodium hydroxide, potassium hydroxide and sodium carbonate, or any two or more of them, or an aqueous solution of the substances characterized in that the pH is 12 or more. Polystyrene fluid gel. The method of claim 1, wherein the waste polystyrene contaminated with impurities, acetone, and an alkaline substance forming the pH 12 or more is added and mixed, and the water and oil contained in the waste polystyrene are separated by phase separation, and polystyrene is added to the acetone. Obtained by plasticizing by making it have fluidity, The fluidic gel of polystyrene characterized by the above-mentioned. To a waste polystyrene contaminated with impurities, acetone and an alkaline substance forming a pH of 12 or more are added and mixed, and the water and oil contained in the waste polystyrene are separated by phase separation, so that the polystyrene is plasticized by acetone to have fluidity. Method for producing a polystyrene fluid gel, characterized in that. To waste polystyrene contaminated with impurities, acetone and an alkaline substance forming a pH of 12 or more are added and mixed to phase-separate water and oil contained in the waste polystyrene, so that polystyrene is stably plasticized by acetone to have fluidity. The obtained polystyrene is obtained by passing a flowable gel of polystyrene through a filter to remove insoluble misc and then removing acetone. The regenerated polystyrene according to claim 6, wherein the alkaline substance contains 3% by weight or less of the polystyrene (excluding 0). The regenerated polystyrene according to claim 6 or 7, wherein acetone of 2% by weight or less (excluding 0%) is contained relative to the polystyrene. 8. The regenerated polystyrene according to claim 7, wherein the alkaline substance includes any one selected from sodium hydroxide, potassium hydroxide and sodium carbonate, or any two or more thereof. A composite molding comprising polystyrene and a solid filler, wherein the composite molding contains an alkaline substance and acetone forming a pH of 12 or higher. The composite molding according to claim 10, wherein the alkaline material contains 3 wt% or less (excluding 0) based on polystyrene, and the acetone contains 3 wt% or less (excluding 0) based on polystyrene. The composite molding according to claim 10 or 11, wherein the polystyrene has a foam structure. According to claim 10 or 11, To the waste polystyrene contaminated with impurities, acetone and an alkaline substance forming the pH 12 or more is added and mixed, and the water and oil contained in the waste polystyrene is separated by phase separation, The polystyrene is plasticized by acetone to have a fluidity, the solid gel is obtained by adding a solid filler to the fluid gel of the polystyrene obtained by mixing uniformly, having a uniform form, and then acetone is removed to solidify the composite Moldings. The composite molding according to claim 13, wherein the acetone removal is performed by immersion in hot water. 14. The composite molding according to claim 13, wherein the surface is heat-treated after solidification by removal of acetone.

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