KR20000012801A - Manufacturing method of soft urethane foam isolation material using wasted-polyurethane - Google Patents

Abstract

PURPOSE: A method for manufacturing a soft urethane foam warm keeping material recycling waste polyurethane is provided to increase working efficiency and productivity, to reduce the cost and to produce the environmental product. CONSTITUTION: The method comprises: a collecting process that selects and collects recycled urethane; a pulverizing process that pulverizes or crushes collected and selected recycled urethane; a smashing process that regularly smashes to make the particle size of the recycled urethane 1mm-10mm; an agitating and mixing process that coats the surface layer of pulverized particle in a gel state by inputting silicon, water and recycled urethane into a mixing tub; a compressing process that compresses the mixing material from the mixing process by injecting continually into a regular shaped frame; and a drying process.

Description

Manufacturing method of rigid urethane foam insulation using waste polyurethane {MANUFACTURING METHOD OF SOFT URETHANE FOAM ISOLATION MATERIAL USING WASTED-POLYURETHANE}

The present invention is a foamed urethane recycled polyurethane (used as waste polyurethane, polyurethane, abbreviated hereinafter) as a polyurethane used as a heat insulator for home appliances and footwear, or a waste disposal target polyurethane produced in the process of producing foamed urethane. As a interior material of various buildings that have been constructed or pre-built, the present invention relates to a method of manufacturing a rigid polyurethane foam insulation using waste polyurethane, which is not only used for insulation, sound insulation and exterior materials, but also greatly improved in density, combustibility, and flame retardancy.

Due to the rapidly changing diversification of modern industrial society, various industrial wastes are increased and generated differently every day, causing a lot of pollution, causing deterioration of water quality and environmental pollution, and thus adversely affecting residential life.

Among them, polyurethane, which is used in various ways such as refrigerators, freezers, various home appliances and footwear soles, has been classified as a special waste and has been recognized as non-recyclable.

Such polyurethane is usually used for the purpose of thermal insulation to improve the cooling efficiency by preventing heat conduction between the inner and outer plates forming the body of home appliances such as refrigerators,

Such insulation and thermal insulation materials have a problem in processing due to their material properties when a certain period of use has elapsed and the household appliances such as refrigerators are disposed of.

If you look at the process of discarding the waste polyurethane in the above for a short time, there is a treatment method by incineration and landfill method, the former method of incineration, soot, odor and its toxicity (phosgene gas, dioxin, etc.) during incineration Is the main cause of air pollution,

The treatment by incineration is unreasonable because it causes a second environmental pollution due to the formation of carbon caused by its toxicity.

In order to alleviate this problem somewhat, the latter method, which is treated in a landfill or similar form, is expected to cause considerable dissatisfaction on the environmental level because the polyurethane is a non-corrosive material.

In particular, the above general insulation is attached to the inner wall of the building in contact with the air, or used as insulation for sandwich panels and buildings, but there is a high risk of exposure to the fire and the existing it is vulnerable to the flame retardancy when the fire occurs It causes a large disaster and has a low density.

Therefore, the applicant has developed a technology to combine waste polyurethane with a specific material and use it as a building material while continuing to research the waste polyurethane so that it can be recycled and reused as building materials. It has already been patented by domestic patent No. 143930.

In the pre-registered invention is a pulverizing step of pulverizing the waste polyurethane to a predetermined size, 8 to 5 wt% polyurethane stock solution, 4 to 1 wt% liquefied freon per 100 wt% of the waste polyurethane pulverized by the crushing process ( A mixing process of mixing 3 to 1 wt% of CFC) and 3 to 1 wt% of water;

Filling the mixed waste polyurethane mixed by the mixing process in the jig (Zig), but the molding process of molding the mixed waste polyurethane by filling by ½ ~ ⅓ amount of the entire jig,

The heat treatment process is performed to heat the mixed waste polyurethane filled in the jig by the molding process with dry heating air at 30 to 40 ° C. to expand the volume to 200 to 300% of the waste polyurethane injected into the jig, and then at 10 to 30 ° C. A method for producing a heat insulating material based on waste polyurethane, characterized in that it takes a cooling step,

It can be seen that the heat-insulating material manufactured by the manufacturing method and the manufacturing apparatus which is a specific means for manufacturing the same are the claims.

Insulation material manufactured from waste polyurethane according to the prior invention has excellent thermal insulation and sound insulation effect because the thermal insulation and sound insulation effect is lower than conventional styropol fiberglass, rock wool, etc. It provides the advantages.

However, in the above-mentioned invention, it is inevitable to add a polyurethane stock solution in the process of regenerating waste polyurethane, and to input relatively expensive raw materials such as a hardener and a freon stock solution. Nonetheless, there are problems to be improved, such as problems in profitability and flame retardancy.

Accordingly, the present invention has been made in order to fundamentally solve the problems of the above-described prior application of the present applicant and has the following objects.

The main purpose of the present invention is to improve the pollution prevention and economic efficiency by allowing the waste polyurethane to be recycled out of the conventional polyurethane disposal method that was disposed by incineration or landfill.

Another object of the present invention is to improve the density and combustibility and flame retardancy significantly while maintaining the same or superior thermal insulation as the heat insulating material made of various other materials, even if inevitably exposed to fire, it is to be extinguished immediately to prevent large catastrophe.

Another object of the present invention is a waste polyurethane obtained by crushing or crushing waste polyurethane to a certain size and by curing and drying the mixture agglomerated due to silicon, waste polyurethane, and a small amount of additives as a raw material. It is to provide a method for producing a rigid urethane foam insulation.

Still another object of the present invention is to improve the profitability that has been a problem in the applicant's prior invention by providing the above manufacturing method.

Another object of the present invention is to provide a very easy and mass-produced material to significantly improve workability and productivity, to provide a low cost and to provide an environment-friendly product.

1 is a process chart showing the manufacturing method of the present invention.

In order to achieve the above object, the present invention provides a construction method of the following insulation.

First, a grinding step of crushing or pulverizing the collected and sorted waste polyurethane is carried out through a collecting step of collecting and sorting ordinary waste polyurethane.

At this time, the particle size (diameter) of the pulverized waste polyurethane (hereinafter abbreviated as "regenerated urethane") is crushed evenly so as to be 1 mm to 10 mm in a nearly powder state.

In this case, the amount of the mixture to be added may be added or subtracted according to the size of the particles, so that the screening process may be performed separately.

In such a state, silicon, water, and regenerated urethane are added to a mixing tank having a certain area, respectively, at a predetermined ratio, and stirred and mixed at a normal temperature for a predetermined time to obtain a gel-like mixture.

After continuously injecting and compressing the mixture obtained in the above mixing process into a mold having a certain shape, the waste polyurethane is produced by successively performing a series of manufacturing processes which take a drying process to complete the product and cut it according to the use and installation conditions. It provides a method of producing a rigid urethane foam insulation.

In the mixing process, the waste polyurethane, which is pulverized and chipped, is easily burned when it comes into contact with the fire and generates a toxic gas, so that the chip surface of the waste polyurethane is coated with silicon for flame retardant treatment. Stir and mix for a period of time to allow the mixture to penetrate and coat the particle skin layer.

The basic manufacturing method of the present invention has various embodiments.

For example, it includes a series of manufacturing processes in which the adhesive coating material obtained by mixing silicon and styrofoam adhesive at a predetermined ratio on the surface of the product completed by the above process is applied, followed by a secondary drying step, and then cutting. .

In this case, the Schiropol adhesive is a mixture of acetone, toluene, gasoline, and MC, which is a low-boiling solvent, is mixed with Schiropol. It is preferable to coat by the coating method.

This is described in detail in Table 1 below, which is a mixture of silicon and waste polyurethane and polysol or acrylamide polymer or latex or styropol adhesive in a ratio, injected into a mold and compressed, and then the primary as described above. The product can be completed through a drying process (such as an ultrasonic dryer with far-infrared rays).

In order to make up for the weakness of the surface in order to improve or enhance the value of the product, the adhesive obtained by dissolving waste sciropol in a low boiling point solvent such as MC is applied to the surface of the finished product after the first drying process.

At this time, the coating method may be completed by the second drying process after coating by spraying or roller driving according to the manufacturing process or working conditions, and may be cut to an appropriate size according to the use.

In addition, the finished product after the primary drying may be used directly as described above, but the appearance is beautiful by attaching a thin film iron plate, wood board, paper or other finishing materials on the both sides, the surface in a conventional manner In case of making sandwich panel, it can be used as insulation board located in the middle part.

In addition, after the first drying and coating on the surface of the insulation board, the finished product after the second drying process can be directly installed and used as an insulation board that also serves as decoration on the inner and outer walls of the building.

In particular, the drying process in the above has a very important effect on the thermal insulation, if not completely dried when using other solvents and adhesives, solvents and adhesives that are absorbed and wrapped by coating the particles and particles of the waste polyurethane in the form of water vapor It remains, which causes a problem in thermal conductivity.

Therefore, the removal of moisture contained in the trace amount and the moisture contained in the adhesive can be a key factor in determining the quality.

However, the use of water to lower the thermal conductivity is a problem that when the surface coating of the pulverized particle surface of the waste polyurethane using only silicon, excessive amount of silicon is required, resulting in high thermal insulation, too high density and poor profitability. Improves combustibility and flame retardancy

In order to reduce the thermal conductivity which is an inherent function of the insulation, a certain amount of water is mixed with silicon,

In particular, as the water evaporated during the drying process, the desired result as a flame retardant insulation material was obtained even if the amount of silicon was reduced.

However, if there is a lot of water and the amount of silicon is too small, there is a problem such as the flame retardancy and combustibility is lowered, and the adhesive strength as the insulation board is lowered, so the amount of water must be properly adjusted.

The drying process of the present invention is most preferably used in combination by adopting an ultrasonic dryer that emits far infrared rays,

It can be used as a curved oscillator or a ceramic oscillator for oscillating the ultrasonic wave, by combining the far-infrared radiator to emit ultrasonic waves, that is, microwaves at the same time.

This is because when the direction of the microwave electric field fluctuates drastically, it resonates with it, and the molecular motion becomes active, and it acts to directly heat the inside of the aggregate, that is, the board, and evaporates moisture within a short time.

Liquid silicon is swelled and dried a little to fill the minute spaces between the recycled urethanes, resulting in an effective drying effect in a minimum amount of time.

On the other hand, in order to obtain a rigid polyurethane foam insulation according to the present invention can be mixed according to the composition to be mixed,

When mixing the recycled urethane with water and silicon, the mixture is added to a cyclone having a certain content in accordance with each composition ratio and stirred and mixed.

In the case where silicon, water, regenerated urethane and other solvents are mixed together, each of the other solvents is first mixed with water, then silicon is mixed in a predetermined ratio, and then regenerated urethane is added and stirred and mixed.

At this time, in order to improve the mixing property, the installation of a plurality of inlets of the mixing agent and the regenerated urethane in the upper part of the mixing tank having a constant internal area doubles the stirring mixing rate.

As a result of requesting the product completed by the above manufacturing method to the Korea Institute of Construction Materials, (Test Method KS M 3809-'97) is tabulated in the table below.

Category (wt%) Density (kg / m ³ ) Combustibility Thermal Conductivity (kcal / m.h. ℃) Length (mm) Time (seconds) Average temperature 20 ℃ Silicon 40, Water 40 Regenerated Urethane 20 (Coating) 129 36 61 0.041 Silicon 32.2, Water 35.7, Regenerated Urethane 17.8, Wallpaper Bond (Polyzol) 113 31 78 0.041 Silicon 35.4, MC 31.5, Urethane Bond 14.2, Regenerated Urethane 18.9 164 28 60 0.049 Silicon 39.4, Latex 3.9, Water 39.4, Regenerated Urethane 17.3 124 29 70 0.043 Silicon 30, Polymer 20, Regenerated Urethane 16.6, Water 33.4 93 31 61 0.038 Silicon 42.4, MC 8.5, Schiropol 4.2, Water 25.4, Regenerated Urethane 19.5 192 37 60 0.049 Silicon 46.4, Latex 3.6 Recycled Urethane 14.3, Water 35.7 231 39 61 0.050 Silicon 37.3, Water 37.3, Polymer 7.5, Regenerated Urethane 17.9 111 42 79 0.045

※ Test Institution: Korea Institute of Construction Materials

The test results in the above is a density of 93 ~ 231kg / m ³ , it can be seen that there is almost no strain even over time or transport,

Due to the nature of construction, even if it is used for a long time, it does not become deformed, transformed or damaged, so that it can be obtained with the side benefit of maintaining long life.

In addition, the thermal conductivity is 0.38 ~ 0.050kcal / m.h. ℃ based on the average temperature of 20 ℃ it can be seen that the heat insulation effect is very excellent, which satisfies the use as a heat insulating material.

In addition, combustibility is provided in the wire mesh on the support frame with a plurality of test pieces of about 13mm thickness, about 150mm length and less than about 13mm width in the sample,

At the bottom, the heat source was removed for about 60 seconds into a heat source (such as a benzene burner), which held about 38 mm on the outside flame and about 6.5 mm on the inside flame.

At this time, the length of time (seconds) until the light of the test piece turned off after touching the test piece and the length of the longest burning length among the burnt parts of the test piece were measured. Later (almost simultaneously), an improvement in combustibility was achieved with complete digestion.

In particular, the flame retardancy test of the insulation material made of the composition ratio indicated in Table 1 was tested in accordance with the Korean Standards Association's Test Method for Flame Retardancy of Building Materials and Structures (KS F2271-98).

It is equipped with a plurality of test pieces of 220mm × 220mm × 30mm and put into a heating furnace maintaining about 305 ℃, and after heating for a certain time, it is detrimental to melting, cracking, residual fire plug test, coefficient of smoke, temperature time area, and gas. By performing the hazard test and passing the flame retardancy test as shown in Table 2, it was found that the flame retardancy at a high temperature is very excellent.

This is expected to be used as interior and exterior materials of buildings, and it can be seen that there are various effective effects such as preventing large catastrophes even when exposed to the danger of fire due to safety.

The product obtained according to the above example was tested by the rigid urethane foam thermal insulation test method (KS M 3809). First, in the case of mixing the silicon and the polysol used as a wallpaper bond, It can be seen that the compression and bending strength are improved.

In addition, the result obtained by mixing MC, urethane bond, and regenerated urethane together with silicon was able to be extinguished simultaneously with the removal of the heat source in combustibility.

In addition, although the result obtained by mixing silicon, latex, water, and recycled urethane together is not shown in the table, the compressive strength and the bending strength were found to be somewhat different, and the thermal conductivity was improved.

In addition, in the case of a mixture of silicon, MC, Schiropol, water and regenerative urethane, it can be seen that it is extinguished at the same time as removing the heat source, which is very combustible.

In addition, in the case of a mixture made of silicon, latex, zesengurethane and water, the density is very high, and thus the compressive and bending strengths are improved, and combustibility is also excellent.

In addition, the result obtained from the mixture of silicon, water, polymer, and recycled urethane is relatively low in density, so that the compressive and bending strengths are slightly decreased, and the combustibility is slightly lowered. Able to know.

As a result of the above test, it can be seen that the density, combustibility, and thermal conductivity are mutually opposite or comparable to each other according to the type and ratio of the mixture, and thus, the products can be differentiated according to the use.

Test result (Test method: KS F 2271-98) Item Name Flame retardant (grade 2) Surface test Part Test Molten variant Crack (mm) Fine salt (seconds) Coefficient of Smoke (C _A ) Temperature time area (℃ .min) Fine salt (seconds) Coefficient of Smoke (C _A ) Temperature time area (℃ min) Within 3 minutes 3 minutes later P U panel One none 0 0 9.0 0 0 0 11.4 0 2 none 0 0 13.8 0 0 0 11.4 0 3 none 0 0 12.0 0 0 0 10.8 0 Item Name Gas test Mouse behavior stop time (minutes: seconds) P U panel One 14: 48 2 14: 49

※ Test Institution: Korea Institute of Construction Materials Testing

According to the present invention as described above, it is possible to recycle the waste polyurethane by incineration or landfill, and thus it can be recycled.

While maintaining the same or superior insulation properties as the insulation materials made of various other materials, the density, combustibility, and flame retardancy are dramatically improved, so that even if exposed to fire, it is immediately extinguished to prevent a catastrophe.

It is obvious that this invention is a very advantageous invention that can obtain various effective effects at the same time as the supply and availability of materials are very easy and mass production can be greatly improved to provide a low cost.

Claims (12)

A collecting step of collecting and sorting ordinary recycled urethane, a crushing step of crushing or crushing the collected and sorted recycled urethane, The crushing process of crushing the particle size of the pulverized regenerated urethane evenly so as to be 1 mm to 10 mm A stirring mixing step of coating silicon, water, and regenerated urethane into a mixing tank having a predetermined area at a predetermined ratio, and coating the pulverized particle skin layer of the regenerated urethane in a gel state at a normal temperature for a predetermined time; A compression step of continuously injecting and compressing the mixture obtained in the above mixing step into a mold having a certain shape; A method for producing a rigid urethane foam insulation using waste polyurethane, in which a series of manufacturing steps are completed, followed by a drying process. The method according to claim 1, A series of preparations are carried out after taking the adhesive coating material obtained by mixing silicon and styrofoam adhesive at a predetermined ratio on the surface of the product completed by the above steps, the coating step and the secondary drying step of drying the coating material. Process for producing a rigid urethane foam insulation using waste polyurethane, characterized in that it comprises a step. The method according to claim 1, Hard urethane foam using waste polyurethane comprising the manufacturing process of a sandwich panel by attaching a thin film iron plate, wood board, paper or other finishing material to the surface of the finished product after the first drying in a conventional manner Method of manufacturing insulation. The method according to claim 1, The coating material Schiropol adhesive is selected by mixing one of acetone, toluene, gasoline, low boiling point solvent MC to Schiropol, The coating material in the above is a method of producing a rigid polyurethane foam insulation using waste polyurethane, characterized in that the silicon and styropol adhesives are mixed by a predetermined ratio, respectively, by a spray method or a coating method using a roller. The method according to claim 1 or 2, The composition to be added to the mixing process is a method for producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, water, recycled urethane is mixed at a predetermined ratio. The method according to claim 1 or 2, The composition to be added to the mixing process is a method for producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, water, regenerated urethane, and polyazole is mixed at a predetermined ratio. The method according to claim 1 or 2, The composition to be added to the mixing process is a method for producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, MC, urethane bonds, recycled urethane is mixed at a predetermined ratio. The method according to claim 1 or 2, The composition introduced into the mixing process is a method for producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, latex, water, recycled urethane is mixed in a predetermined ratio. The method according to claim 1 or 2, The composition introduced into the mixing process is a method for producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, polymer, regenerated urethane, water is mixed at a predetermined ratio. The method according to claim 1 or 2, The composition to be added to the mixing process is a method for producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, MC, Schiropol, water, recycled urethane is mixed at a predetermined ratio. The method according to claim 1 or 2, The composition to be added to the mixing process is a method of producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, latex, regenerated urethane, water is mixed at a predetermined ratio. The method according to claim 1 or 2, The composition to be added to the mixing process is a method for producing a urethane foam insulation using waste polyurethane, characterized in that the silicon, water, polymer, recycled urethane is mixed in a sperm ratio.