KR20030075304A - Manufacturing process of interior finishing using urethan - Google Patents

Abstract

PURPOSE: A method for manufacturing building interior materials as wood substitutes using wasted hard urethane is provided to minutely crush collected wasted hard urethane, and to mix sawdust with adhesives or sawdust with melamine resin and adhesives, then to press and mold the urethane as supplying high-temperature steam, thereby implementing environment-friendly features. CONSTITUTION: Wasted hard urethane is collected, and is minutely crushed to have less than 1mm size(1). Powder of the minutely-crushed wasted hard urethane is mixed with 10-50% of sawdust in a weight ratio(2). The mixed materials are mixed with 10-50% of wet-hardening adhesive in a weight ratio(3). The mixed materials with the adhesive are put into a mold, and heated by supplying more than 100 degrees Celsius steam, then are pressed to mold a board until thickness thereof is reduced to 1/3-1/5(4). A product is demolded after a pressing process, and is dried in a drying furnace at 40 to 60 degrees Celsius(5).

Description

Manufacturing process of building interior materials as wood substitute using waste hard urethanes {Manufacturing process of interior finishing using urethan}

The present invention relates to a method for producing a building interior material as a wood substitute using waste hard urethane.

Recently, due to indiscreet deforestation, environmental pollution, and industrialization, timber, which is a natural building material, is in depletion crisis. Therefore, there is an urgent need to develop substitutes for wood.

Accordingly, after processing wood, the remaining wood or wood is crushed, and then the fiber is extracted through chemical treatment, and then compressed into panels and hardened boards made by compressing sawdust.

The MDF plate is widely used as a substitute for natural wood because it can be molded without deformation, has a strong strength, and has a large surface area.

However, the MDF and the like as well, the main raw material is only timber, it can not prevent the reckless logging of forests to obtain timber.

In addition, MDF has a problem that it is relatively weak to fire due to its high specific gravity and heavy weight and flammability.

On the other hand, a refrigerator or a freezing container and a building, etc. are required to use a heat insulating material in order to suppress the heat exchange with the outside, a hard urethane is used as a heat insulating material used in many of these.

Accordingly, when disposing of the refrigerator and the freezing container, a large amount of waste urethane is generated. In the conventional case, there has been a problem of causing environmental pollution by treating the waste urethane with landfill or incineration.

Accordingly, the present invention has been proposed in view of the above, and its object is to recover waste urethane from recycled refrigerators, refrigerated containers, and building insulation materials, and to produce recycled plates, making them lightweight, environmentally friendly, and excellent in thermal insulation. To provide a method for manufacturing the building interior material as a wood substitute having a waterproof effect and non-combustible.

1 is a flow chart showing a manufacturing process of building interior materials according to the present invention

Figure 2 is a view showing a compression molding process by the mold of the present invention

Figure 3 is a view showing the building interior panel manufactured by the present invention

※ Explanation of codes for main parts of drawing

1: collection process 2: grinding process

3: mixing process 4: adhesive mixing process

5: compression molding process 6: demolding process

7: drying process 10: mixture

11: lower mold 12: steam supply passage

13 steam supply hose 14 steam equipment

15: upper mold 16: building interior materials

In order to achieve the above object, the manufacturing method of building interior materials as a substitute for wood using the waste hard urethane of the present invention

(1) a step of pulverizing the waste light urethane to be discarded and pulverizing it to a particle size of 1 mm or less;

(2) mixing the sawdust of 10 to 50% by weight relative to the finely ground waste urethane powder;

(3) mixing a moisture curable adhesive of 10 to 50% by weight with respect to the mixture mixed in the above step;

(4) forming a sheet by compressing the mixture of the adhesive into a mold and compressing it until the thickness is reduced to 1/3 to 1/5 while heating by supplying steam of 100 ° C. or more;

(5) demolding the product after the compression step and drying in a drying furnace with an internal temperature of 40 ~ 60 ℃.

In addition, it is possible to provide a fire-resistant building interior material by mixing 20 to 100% melamine resin powder in a weight ratio with respect to the mixture of the above-mentioned hard urethane powder and sawdust.

And it is characterized by using a one-component polyurethane as the adhesive.

EMBODIMENT OF THE INVENTION Below, this invention is explained in full detail.

1 is a view showing the manufacturing method of the building interior material according to the present invention by process, after the collection step (1) of separating and recovering waste light urethane, such as sandwich panels from a discarded refrigerator or a freezing container and a redevelopment building, etc. The pulverized urethane collected is pulverized finely so that the particle size may be 1 mm or less.

When the finely ground pulverized urethane powder is 100, a mixing step (3) is carried out for mixing with the sawdust of 10 to 50% by weight.

The reason for the addition of sawdust here is that waste urethane itself is not enough strength when forming panels, so it is inexpensive to reinforce the strength and recycles sawdust which is generated as a by-product during wood processing and discarded.

When the mixture is set to 100, 10-50% of the moisture-curable adhesive is evenly mixed in the weight ratio thereof.

At this time, it is preferable to use a one-component polyurethane as the adhesive, and it is preferable to use a product having a curing time of less than two hours for the one-component polyurethane adhesive.

As an example which can be used for such an adhesive, PT-301 product of Korea Polyol Co., Ltd. is mentioned as a urethane type adhesive agent.

Before the adhesive is mixed, the melamine resin powder may be further mixed in a ratio of 20 to 100% by weight with respect to the mixture of hard urethane and sawdust, and when the melamine resin is added, a fire resistant building interior material is produced.

Moreover, it is preferable to keep the amount of adhesive higher than usual about the mixture which melamine resin mixed, ie, to contain 35-50 weight ratio close to an upper limit.

The mixture formed as described above is subjected to a compression molding process (5) in which a mixture is put into a mold having a rectangular shape, which can be produced in a plate shape, and then compressed and molded.

In this case, as shown in FIG. 2, a steam supply passage 12 is formed in the lower mold 11 into which the mixture 10 is injected, and steam 100 ° C. or more from the steam facility 14 through the steam supply hose 13. Pressing the upper mold 15 while performing the supply process at the same time to perform a compression operation.

The reason for supplying steam in the above compression process (5) is to supply steam so that curing can occur quickly and surely because the adhesive moisture curing type used in the mixture, and the mold is suitable for curing reaction by steam supply. (80 ℃ ~ 110 ℃) to maintain the compression if you do not supply the steam takes too long, economic efficiency is greatly reduced in terms of productivity.

Here, the mixture 10 injected into the mold 11 is pressurized for 20 to 30 minutes until its thickness is reduced to 1/3 to 1/5 through compression, thereby obtaining a high density and strength plate.

After the above compression process, after demolding to separate the plate (6), a drying process (7) which is dried for 12 to 48 hours in a drying furnace in which the internal temperature is maintained at 40 to 60 DEG C. You get a building interior 16.

At this time, if the drying temperature is lower than 40 ℃, the drying time is too long, if it is higher than 60 ℃ may be a deformation of the plate material is the optimum temperature around 50 ℃.

(Example)

The heat insulating material (closed urethane) collected from the waste refrigerator was ground to a particle size of 0.5 mm to obtain 5 kg of powder.

2 kg of sawdust was mixed with the 5 kg of powder, 1.4 kg of one-component polyurethane (trade name PT-301, manufactured by Poriol Korea Co., Ltd.) was mixed and stirred well to obtain 8.4 kg of the mixture.

In order to obtain a plate for various tests, a thickness of 45 mm is added to a mold having a height of 100 mm × 100 mm × 100 mm, and the steam is supplied at 120 ° C. in contact with all sides of the mixture through the mold. Pressurized with the upper mold for 25 minutes to become 1/3.

Next, the sheet material obtained by demolding was put into the drying furnace of internal temperature 45 degreeC, left for 24 hours, and taken out and obtained the board | plate material of thickness 15mm.

On the other hand, the composition ratio of the component content of the waste urethane and sawdust, melamine and adhesives were changed as shown in Table 1 below to obtain the plates required for each test.

Table 1

Example Lung Hard Urethane sawdust Melamine glue Compression Ratio Thickness change Pressurization time (minutes) One 30 g 30 g - 25 g (42%) 3: 1 45 mm → 15 mm 20 2 45 g 15 g - 15 g (25%) 3: 1 45 mm → 15 mm 20 3 54 g 6 g - 9 g (15%) 3: 1 45 mm → 14 mm 20 4 15 g 15 g 30 g 30 g (50%) 4: 1 45 mm → 11 mm 30 5 30 g 10 g 20 g 20 g (33%) 3.8: 1 45 mm → 12 mm 30

Physical properties including mechanical strength of the plates obtained as described above are shown in Table 2 below.

Table 2 Property Value

Example Specific gravity (g / cm 3) Compressive strength (㎏ / ㎠) Absorption rate (%) Flameproof degree Standard Remarks One 0.48 0.9 78 × ICSM 3809 2 0.53 0.8 83 × ″ 3 0.46 0.7 92 × ″ 4 0.78 1.0 90 Nonflammable ″ 5 0.65 0.8 85 Nonflammable ″

Here, the compressive strength was measured using a universal testing machine, and the flame resistance was measured using a general flame retardant tester.

In order to match the test conditions, the plate was molded and then each specimen was naturally dried at room temperature for 48 hours and then experimented.

As described above, the present invention recovers finely divided waste polyurethane that forms a thermal insulation material and a sandwich panel for building a home appliance which is usually incinerated or buried, and then finely crushed and mixed sawdust and adhesive or sawdust and melamine resin and adhesive together. By compressing while supplying high-temperature steam, forming, and drying, there is an effect of providing a building interior material that can substitute for wood, the specific usefulness of which is as follows.

1. It is eco-friendly because it is a recycled product using waste light urethane.

2. If melamine is mixed, it becomes a fire-resistant lining.

3. Light weight compared to wood for the same strength.

4. Since 90% or more of rigid urethane is a closed cell structure, water absorption is low due to low water absorption and condensation phenomenon can be obtained.

5. Insulation is superior to wood.

6. It has the advantage of easy processing for various applications because of its good secondary workability.

Claims (3)

(1) a step of pulverizing the waste light urethane to be discarded and pulverizing it to a particle size of 1 mm or less; (2) mixing the sawdust of 10 to 50% by weight relative to the finely ground waste urethane powder; (3) mixing a moisture curable adhesive of 10 to 50% by weight with respect to the mixture mixed in the above step; (4) forming a sheet by compressing the mixture of the adhesive into a mold and compressing it until the thickness is reduced to 1/3 to 1/5 while heating by supplying steam of 100 ° C. or more; And (5) demolding the product after the compression step and drying the product in a drying furnace having an internal temperature of 40 to 60 ° C .; The method of claim 1, A method for producing a building interior material as a substitute for wood using waste urethane, characterized in that 20 to 100% of melamine resin powder is further mixed in a weight ratio with respect to the mixture of the waste urethane powder and sawdust. The method according to claim 1 or 2, The moisture-curable adhesive is a one-component polyurethane adhesive, characterized in that the manufacturing method of building interior materials as a substitute for wood using waste urethane.