KR20010076084A - Method manufacturing buoy with double structure - Google Patents

Abstract

PURPOSE: A method for manufacturing a buoy having dual structure is provided to improve durability, shock resistance and oil resistance by filling foamed resin or poly urethane in a buzzer, to keep buoyancy by making fishes and calms separated easily, and to minimize pollution. CONSTITUTION: A buoy having dual structure is manufactured by the following steps. An outer member 2-4mm in thickness is formed by extruding a resin selected from the group consisting of high density polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, nylon or ABS(Acrylonitrile-Butadiene-Styrene copolymer) resin in 2-5kg/cm2 of pressures and at 190-210deg.C of temperatures. Polyurethane foaming body or waste foamed resin is filled in the outer member in 40-60kg/m2 of foam density, and then, the outer member is sealed. Therefore, a buoy consisting of an outer member made of a thermoplastic resin is produced.

Description

Method for manufacturing rich double structure {Method manufacturing buoy with double structure}

The present invention relates to a method for producing a rich man made of foamed resin, and more particularly, by extrusion molding a resin selected from high-density polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, nylon and ABS resin with excellent durability After making the outer material of the rich, foamed filling of the rich with polyurethane or filling with foamed resin waste to produce the double structure of the rich structure, compared to the case of using a single foam, the desorption of fish and shellfish due to the high density of the surface The present invention relates to a method for producing a double-structured rich, which is easy and has excellent buoyancy and durability and can be used for a long time.

The conventionally used rich (buoy) is mainly used to foam the expanded polystyrene (expandable polystyrene, hereinafter EPS). However, the EPS may be easily damaged by light impact or friction during use due to insufficient adhesion of the molded product, and easily damaged due to lack of solvent resistance and friction resistance, and the secondary environmental pollution caused by the waste due to frequent replacement. Bring. In addition, deformation and damage of the shape during the friction is impossible to detach when attaching the shellfish, and even if some detachment, the environmental pollution due to the part attached to the shellfish becomes more serious. In addition, over time, buoyancy decreases, requiring one or two complete replacements per year, and reusability is impossible due to the attachment of fish and shellfish. As a result, there were various waste stages such as environmental pollution caused by waste at the time of disposal, and easily eroded and damaged by spore propagation of various seaweeds.

Thus, in order to solve the above problems, the foam was prepared by foaming alone with polyethylene and polyurethane having superior durability than EPS. However, this also has the disadvantage of poor durability due to the pores of the cross-section foam and the desorption of fish and shellfish is not smooth. Accordingly, the surface hardness and the high density of the rich are required to improve the reusability and the polymer single foam alone cannot satisfy the required properties.

Polystyrene foaming agents used in the manufacture of conventional rich has a problem that the durability and desorption of fish and shellfish is not easy, and the buoyancy is reduced during long-term use.

Therefore, in the present invention, after the extrusion of a resin selected from high-density polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, nylon and ABS resin with excellent durability to produce a rich external material, the inside of the rich By foaming or filling foamed polyurethane with polyurethane, it is excellent in durability, impact resistance and oil resistance, and can be easily detached from fish and shellfish to maintain buoyancy for a long time when using it for a long time, thereby minimizing waste contamination. It is an object of the present invention to provide a method for manufacturing a rich double-structured structure.

The present invention is a method for producing a rich man made of foamed resin, high pressure polyethylene (HDPE), polypropylene (PP), polycarbonate (PC), polyethylene terephthalate at an extrusion pressure of 2 ~ 5 kg / ㎠, temperature 190 ~ 210 ℃ (PET), polyvinyl chloride (PVC), a process for producing a rich external material having a thickness of 2 to 4 mm by extrusion molding a resin selected from nylon and ABS resin,

It is characterized by producing a rich double structure by the step of filling the polyurethane foam or the waste foaming resin into the outer material so as to have a foam density of 40 to 60 kg / m 2.

The present invention will be described in more detail as follows.

The present invention is made of a thermoplastic resin having excellent durability, foamed filling the inside with polyurethane and waste foaming resin to produce a double structure rich, excellent durability, impact resistance and oil resistance can be used for a long time and detachment of fish and shellfish It is related to the dual structure rich improved to be easy.

First, in order to be used as the external material of the present invention, it should be able to be used for a long time, so it is preferable to use it with a high density resin which is excellent in durability and oil resistance and can suppress spore propagation of various seaweeds. In the case of polystyrene foam (EPS), which is conventionally used as a rich man, the impact strength of 0.6 to 10 kgf · cm / cm 2 has a disadvantage in that the rich easily breaks during self-collision caused by waves and typhoons. Therefore, in the present invention, a resin selected from high density polyethylene (HDPE), polypropylene (PP), polycarbonate (PC), polyethylene terephthalate (PET), polyvinyl chloride (PVC), nylon and ABS resin may be used, among which The use of HDPE is economically desirable. The HDPE resin has a density of 0.940 to 0.965 g / cm 3, and when used as a rich external material, spore breeding of various seaweeds is difficult because the surface is smooth due to high density. In addition, the impact strength of 25 to 40 kgf · cm / ㎠ has the characteristics of excellent durability, impact resistance and oil resistance.

The outer material of the dual structure rich of the present invention is manufactured in the form of a polyurethane raw material injection hole, the manufacturing method is the most suitable extrusion process and can be applied by those skilled in the art. The external material of the present invention is applied to a general extruder such as a single screw extruder, a twin screw extruder, and a multi-wheel screw extruder by adding 2 to 4 parts by weight of pigment to 100 parts by weight of a resin selected from HDPE, PP, PC, PET, PVC, Nylon and ABS resin. Can be used. At this time, the extrusion pressure is preferably carried out in the range of 2 ~ 5 kg / ㎠, temperature 190 ~ 210 ℃. In addition, the thickness of the outer material of the rich manufactured through the extrusion process is 2 ~ 4mm, wherein if the thickness is less than 2mm, the durability and impact resistance properties required as the external material is lowered, if more than 4mm by weight The buoyancy and cost increase caused by this are uneconomical and undesirable.

In addition, in order to fill the inside of the double-structure rich of the present invention, the polyurethane foam or waste foaming resin is filled in the outer material so as to have a foam density of 20 to 60 kg / ㎡ and sealed to the outer material prepared in the double To prepare the rich in the structure.

The two methods for the internal filling process of the dual structure rich are described in more detail as follows.

For example, 100 parts by weight of polypropylene glycol, 120 to 180 parts by weight of methylene diisocyanate, 25 to 35 parts by weight of foam, 5 to 10 parts by weight of catalyst and silicone foam stabilizer are injected into the external material of the rich manufactured through the extrusion process. Filling with polyurethane through the process to prepare the double-structure rich.

As another method of filling the rich inside of the present invention, the discarded polystyrene foam or polyurethane foam is crushed into 5 to 10 cm 3, respectively, treated with an acrylic binder and injected into an external material, followed by a space with an external material and an injection hole. Polypropylene glycol, methylene diisocyanate, foam, catalyst, and silicone thickener are added to the mixture to fill the rich interior to prepare a double structured rich.

Referring to the foaming process of the polyurethane of the present invention in more detail as follows.

Polyurethane foam is produced by foaming urethane group by addition polymerization reaction of active hydroxyl group (-OH) and isocyanate (-N = C = O). The polyurethane of the present invention is foamed by containing polyol, methylene diisocyanate, catalyst, blowing agent and foam stabilizer.

First, the polyol used in the present invention is mainly used polypropylene glycol (PPG), the PPG is a bifunctional in which the -OH group is present at the sock end, the weight average molecular weight of 400 to 2,000 to the required physical properties Mix accordingly.

As for diphenylmethinediamine (MDI) used for this invention, polymeric MDI is used, the average functional group number is 2.3-3.0, and the molecular weight 360-400 is used. The content used in the present invention is 120 to 180 parts by weight, preferably 130 to 160 parts by weight based on 100 parts by weight of PPG. At this time, if the content is small, the foaming is small and the density is high, so the difference of buoyancy is generated. If the content is too large, the surface of the foam is broken, the durability of the cell is decreased, and the adhesion to the external material is very poor. Becomes undesirable.

Tertiary amine is used as the catalyst used in the present invention, and two or more kinds of catalysts are used in combination according to the characteristics of each product. As the catalyst used in the present invention, dimethylcyclohexylamine (DMCHA) and tetramethylenediethylene (TMHDA) are used. The content used in the present invention is added 5 to 10 parts by weight with respect to 100 parts by weight of PPG, respectively, if more or less than the content affects the reaction rate to form the surface / core layer of the product, such as fluidity and foam of the reaction mixture and This will affect the physical properties of the product.

The blowing agent used in the present invention is added to form bubbles during the polymer reaction and to control the foaming density of 20 to 60 kg / m 3 for use as rich. The blowing agent is conventional and mainly fluorine-based compounds such as HCFC-14b and CFC 11 are used. In general, the foaming may be water-foaming using water, but in the case of such water-foaming, there is a fear that the buoyancy of the rich is lowered. The content used in the present invention is added to 25 to 35 parts by weight based on 100 parts by weight of PPG, when the content is out of the above range affects the required foam density of the rich, which is undesirable for the optimal quality composition .

In addition, as the foaming agent (surfactant) used in the present invention, a silicone foaming agent is mainly used. The foam stabilizer is characterized by facilitating the mixing of the raw materials, lowering the surface tension of the urethane system to help bubble growth, and improve the fillability during foaming to uniform product density. The content used in the present invention is 0.5 to 3 parts by weight based on 100 parts by weight of PPG, in which case the urethane cells do not grow uniformly due to bubble instability when the content is out of the above range.

Therefore, the double-structured rich prepared with the above composition and content is excellent in durability, it is possible to produce a rich with a foam density of 20 to 60 kg / ㎥ for use as a rich. The lifespan of the dual structure rich according to the present invention is semipermanent for 10 to 20 years or more as compared to the life span of the rich made of the conventional polystyrene foam is half a year to one year, and can be used for a long time. In addition, due to the high-density of the resin of the external material, the double structure is difficult to spore breeding of various seaweeds, and has excellent durability, impact resistance and oil resistance, and is very useful for fishing operations such as aquaculture, anchor net fishing, etc. Can be used.

In particular, by using the discarded polystyrene foam and the polyurethane foam to fill the inside of the rich, waste can be recycled, thereby suppressing secondary environmental pollution.

On the other hand, the method for producing the polyurethane foaming agent of the present invention using the above composition components is not particularly limited, it can be easily prepared by those skilled in the art.

In addition, the dual structure of the present invention can be produced by varying the size and shape of the various in accordance with the use.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by Examples.

Examples 1-6 and Comparative Examples 1-3

An outer material having a length of 47 mm, a diameter of 37 mm, and a thickness of 2.5 mm of the rich was prepared by extrusion processing using a high density polyethylene resin at an extrusion strength of 3 kg / cm 2 and a temperature of 210 ° C.

Next, according to the composition of Table 1, the polyurethane material was injected into the prepared outer material and foam-filled to prepare a double structure rich. The physical properties of the prepared double structure was measured by the following method, and the results are shown.

(1) Cold resistance test: After the filling was completed, the temperature was reduced to -25 ° C in the freezer compartment, and after 24 hours, it was dropped at a height of 5m and observed for cracks and ruptures inside and outside.

(2) Impact test: After the filling was completed, the 10 kgh beam was dropped horizontally at a height of 5 m to observe the presence of cracks and breaks inside and outside.

(3) Heat test: After completion of filling, it was immersed in boiling water (70-80 ° C.) to observe internal and external deformation after 10 hours.

As described above, the rich of the dual structure according to the present invention is excellent in durability, impact resistance and oil resistance can be used for a long time. In addition, it is less damaged by typhoons, waves, and self-impact between each other, and it is easy to remove the fish and shellfish, so it is possible to prevent secondary environmental pollution as well as to reduce buoyancy over time, which is useful for aquaculture. Can be used.

Claims (3)

In the manufacturing method of the rich consisting of foamed resin, high pressure polyethylene (HDPE), polypropylene (PP), polycarbonate at an extrusion pressure of 2 ~ 5 kg / ㎠, temperature 190 ~ 210 ℃ (PC) extruded resin selected from polyethylene terephthalate (PET), polyvinyl chloride (PVC), nylon and ABS resin to produce a rich external material having a thickness of 2 to 4 mm, A method for producing a double-structured rich, characterized in that the polyurethane foam or the foamed foamed resin is filled and sealed in the outer material so that the foaming density is 20 to 60 kg / ㎡. The method of claim 1, wherein the high density polyethylene has a density of 0.940 ~ 0.965 g / cm3. The method of claim 1, wherein the polyurethane foam is contained in 100 parts by weight of polypropylene glycol, 120 to 180 parts by weight of methylene diisocyanate, 25 to 35 parts by weight of foam, 5 to 10 parts by weight of catalyst and silicone foam stabilizer, respectively. The manufacturing method of the dual structure rich.