KR20180085131A - Manufacturing method of eco-friendly buoy and eco-friendly buoy using the same - Google Patents

Abstract

The present invention relates to a manufacturing method for an eco-friendly buoy which has a polyolefin-based outer wall manufactured from parison, by comprising: a step a) of introducing parison into the inside of a mold; a step b) of closing the mold; a step c) of blowing air to the inside of the parison by a blowing pin; a step d) of injecting a bead into one side of the mold through a communicating injection path; a step e) of charging the parison by foaming the bead; and a step f) of opening the mold and conducting blowdown of a buoy from the mold. Therefore, the manufacturing method for an eco-friendly buoy can mold an eco-friendly buoy in a desirable shape without any loss of a foaming body.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a manufacturing method of an eco-friendly buoy and an eco-friendly buoy manufactured therefrom,

The present invention relates to a method of manufacturing buoys comprising an envelope layer for preventing loss of foam.

A buoy is also referred to as a buoy or a buoy, and is used in various ways to indicate risk factors such as various farms, markings on fisheries, markings on the net, markings on fisheries, directions on the route, or sunken ship on the reef or seabed. These buoys have been mainly used for buoyant and low-cost materials for their intended use in the sea. Specifically, buoys conventionally used were mostly made of styrofoam.

However, such buoys of styrofoam material are vulnerable to impacts such as waves, which can break well, and cause serious pollution to the oceans due to not being well tolerated by sunlight but also not decaying.

Furthermore, in addition to the damage caused by the impact, such styrofoam buoys gradually lose their buoyancy while absorbing the water gradually, and eventually they become compressed to lose their buoyancy permanently. Due to such a problem, the styrofoam buoy is very short in use life, and causes problems such as environmental pollution described above.

In order to solve such a problem, Korean Patent No. 10-1599258 discloses a buoy of polyethylene foam or foamed polypropylene material having an accommodation space therein, but in this case, the problem of environmental pollution can be reduced because polystyrene is not used However, there is a problem that the foamed polyethylene or the foamed polypropylene itself is very weak to the impact due to its characteristics.

Korean Patent No. 10-1599258

The object of the present invention is to provide a method for manufacturing an eco-friendly buoy by preventing the loss of foam.

Another object of the present invention is to provide a method for manufacturing buoys which are resistant to external shocks.

It is still another object of the present invention to provide a method for manufacturing buoys which is not damaged by ultraviolet rays.

In the eco-friendly buoy manufacturing method according to the present invention,

A method of manufacturing an environmentally friendly buoy having a polyolefin outer wall manufactured from Parison,

a) introducing a parison into a mold;

b) closing the mold;

c) blowing air into said parison by means of a blowing pin;

d) injecting the bead through an injection passage communicated to one side of the mold;

e) foaming the beads to fill the parison; And

f) opening the mold and removing the buoy from the mold;

.

The eco-friendly buoy manufacturing method according to an embodiment of the present invention is characterized in that before step a)

a1) introducing the support into a mold comprising a cavity by means of a support loading pin;

a2) introducing the polyolefin-based parison into the mold so as to surround the periphery of the support.

In the eco-friendly buoy manufacturing method according to the embodiment of the present invention, in the step a1), the number of supports to be introduced into the mold may be 1 to 9.

The eco-friendly buoy manufacturing method according to an embodiment of the present invention is characterized in that, between steps b) and c)

b1) lowering the support loading pin.

In the method of manufacturing an eco-friendly buoy according to an embodiment of the present invention, the polyolefin-based parison may include at least one selected from low-density polyethylene and linear low-density polyethylene.

The polyolefin-based parison according to an embodiment of the present invention may further include an ultraviolet absorber.

In the method of manufacturing an eco-friendly buoy according to an embodiment of the present invention, the parison may be a multi-layer parison composed of an outer parison and an inner parison.

In the method of manufacturing an eco-friendly buoy according to an embodiment of the present invention, the parison further comprises a foaming agent, and the foaming ratio of the envelope foamed in step e) by the foaming agent may be 3 to 20.

The method of manufacturing an eco-friendly buoy according to an embodiment of the present invention may further include the step of wrapping the buoy drawn by the polyolefin-based sheet after the step (f).

The method of manufacturing an environmentally friendly buoy according to an embodiment of the present invention may further include spraying a foaming agent onto the inner surface of the parison before the step d).

The present invention also provides an eco-friendly buoy, and the affinity buoy according to the present invention is manufactured by a manufacturing method according to an embodiment of the present invention, and may include a polyolefin-based outer wall and a foamed bead filled therein.

According to the eco-friendly buoy manufacturing method of the present invention, it is possible to easily form the foam and the sheath by using the method of manufacturing the parison, inserting the foam beads, and foaming the foam to prevent the loss of the foam by the sheath, There is an advantage that can be prevented.

The eco-friendly buoy manufacturing method according to the present invention has the advantage that buoys which are resistant to external impact can be manufactured by further including a support.

The method of manufacturing an eco-friendly buoy according to the present invention is advantageous in that a buoy having excellent resistance to ultraviolet rays can be manufactured by further including an ultraviolet absorber on the outer layer.

1 is a view schematically showing a method of manufacturing a buoy according to an embodiment of the present invention.

Hereinafter, a method of manufacturing an eco-friendly buoy according to the present invention will be described in detail with reference to the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the following drawings may be exaggerated in order to clarify the spirit of the present invention. Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

According to the present invention,

A method of manufacturing an environmentally friendly buoy having a polyolefin outer wall manufactured from Parison,

a) introducing a parison into a mold;

b) closing the mold;

c) blowing air into said parison by means of a blowing pin;

d) injecting the bead through an injection passage communicated to one side of the mold;

e) foaming the beads to fill the parison; And

f) opening the mold and removing the buoy from the mold;

To a method of manufacturing an eco-friendly buoy,

The buoy manufactured according to the present invention is advantageous in that it can prevent the loss of the foam, and is eco-friendly. In addition, the buoy is easily molded by molding the parison and then foaming. Specifically, the buoy manufactured by the manufacturing method of the present invention does not cause loss of the foam even in the case of waves and other impacts, and can be used for a long period of time by preventing buoyancy loss due to water absorption of the foam. Furthermore, in the manufacturing method, the conventional manufacturing method of molding the foam and wrapping the envelope has difficulty in wrapping the envelope while maintaining the shape of the molded foam. However, in the eco-friendly buoy manufacturing method of the present invention, It is advantageous that the beads can be easily molded into a desired shape by foaming the beads.

In the method of manufacturing an eco-friendly buoy according to the present invention, the shell of the buoy can be produced from a polyolefin-based parison. When an outer shell of a buoy is manufactured from a polyolefin-based parison, it is excellent in weatherability and is particularly useful when used as a buoy shell. Specifically, the polyolefin-based resin may be at least one selected from low-density polyethylene, linear low-density polyethylene, high-density polyethylene and polypropylene, and more specifically, a sheath layer containing 80 wt% or more of high-density polyethylene may be used. When the high-density polyethylene is contained in an amount of 80% by weight or more as described above, it is advantageous in that it can protect the inner foam with a relatively high mechanical strength, while being excellent in waterproofness and weatherability with a dense structure.

Furthermore, it is preferable that the compound used as such a sheath has a glass transition temperature that is low enough to carry out the blowing process, without dissolving in heating for foaming in the foaming step described later. Specifically, the parison according to an embodiment of the present invention may use a resin composition having a melting point of 80 to 180 ° C, more specifically 100 to 160 ° C.

In addition, in the eco-friendly buoy manufactured according to the embodiment of the present invention, the shell is preferably formed to have a thickness of from 1 to 30 mm, more specifically from 3 to 20 mm, from the viewpoint of long- But is not limited thereto. Further, the thickness of the parison can be appropriately adjusted in consideration of the thickness of the outer shell.

Such a polyolefin parison may specifically include an ultraviolet absorber. When the ultraviolet absorber is used, it is possible to prevent the damage caused by ultraviolet rays of not only the polyolefin but also the inner foam, thereby improving the durability of the buoy.

Furthermore, one or more of these ultraviolet absorbers may be specifically selected from hydroxybenzophenone compounds, salicylic ester compounds, benzotriazole compounds and cyanoacrylate compounds. The ultraviolet absorber may be included in an amount that does not affect the waterproofness and flexibility of the shell, and may be 0.01 to 10% by weight, more specifically 0.1 to 5% by weight, of the parison.

In addition, the polyolefin-based parison according to an embodiment of the present invention may further include an inorganic filler to improve the mechanical properties and durability and lower the manufacturing cost. The inorganic filler may specifically include at least one selected from silica, diatomaceous earth, magnesium carbonate, calcium sulfate, aluminum hydroxide, zinc oxide, magnesium hydroxide, titanium oxide, alumina, mica, zeolite, talc and clay. The content of the inorganic filler is not particularly limited as long as it is added in such a ratio as to ensure the flexibility of the shell and to ensure waterproofness, but may be specifically included in the parison in an amount of 0.1 to 10% by weight, preferably 0.5 to 10% by weight .

Further, the parison according to an embodiment of the present invention may further include one or two or more additives selected from lubricants, antioxidants, pigments and dyes which are conventionally used as needed. In this case, the amount of the additive included depends on the purpose and type of the additive. Specifically, each additive may be included in the parison in an amount of 0.1 to 5 wt%.

In the method of manufacturing an eco-friendly buoy according to an embodiment of the present invention, the method may further include closing the mold for molding the envelope before the step d) and after the step c), and further, after the step of closing the mold, Of course, it is also possible to carry out secondary blowing which again blows air in order to make the shape completely match the mold.

In this case, the gas injected into the parison in the blowing or secondary blowing is not limited as long as it is a gas which does not cause a chemical reaction with parison or beads, but may be specifically nitrogen or air.

The method of manufacturing an eco-friendly buoy according to an embodiment of the present invention may further include the step of introducing the entire support into the cavity using a loading pin. Specifically, the method of manufacturing an eco-friendly buoy according to an embodiment of the present invention includes:

a1) introducing the support into a mold comprising a cavity by means of a support loading pin;

a2) introducing the polyolefin parison into the mold so as to surround the periphery of the support, and in this case,

Between the steps b) and c)

b1) lowering the support loading pin.

The support loading pin according to an embodiment of the present invention means a loading pin for introducing the support into a mold including a cavity. Further, such a support loading pin may preferably be located at the bottom center of the mold, and more particularly, when the support loading pin is removed from the mold, the support loading pin is integrated with the blowing pin to facilitate the blowing Can be done.

Through these steps, the support can be easily introduced into the buoy without any molding of the foam, and the buoy produced can be prevented from being damaged by the external impact. Furthermore, the method of manufacturing the buoy according to the present invention can improve the binding force between the foamed bead and the support by introducing the support into the parison, injecting the bead, and then foaming the bead in the parison. The buoy containing the conventional support has a problem that an open space between the support and the foam occurs inside the buoy, and the excited space causes a friction between the foam and the support inside the buoy when the external impact is applied. However, as in the case of the embodiment of the present invention, when the support is introduced and foamed, the binding force is improved and the problem of the internal friction can be solved.

Specifically, such a support is not limited as long as it can improve the impact resistance of a buoy inside a buoy, but may be specifically a polymer resin. Preferably, the support according to an embodiment of the present invention has a glass transition temperature Tg) of 10 占 폚 or less, more specifically, a glass transition temperature of 80 to 10 占 폚. When the glass transition temperature of the elastic support is in the above-mentioned range, since the support has some elasticity, the support absorbs the external impact applied to the buoy, thereby further improving the impact resistance of the buoy. More specifically, the elastic support satisfying the glass transition temperature may be one or two or more selected from polyurethane, styrene thermoplastic elastomer, olefin thermoplastic elastomer, urethane thermoplastic elastomer, amide thermoplastic elastomer and polyester thermoplastic elastomer have. Specifically, in the case of a styrenic thermoplastic elastomer, it may be a polystyrene-polybutadiene copolymer or a polystyrene-polyisoprene copolymer, and the polyolefin thermoplastic elastomer may be a polypropylene-poly (ethylene-alpha olefin) The polyester-based thermoplastic elastomer may be an aromatic polyester- (C2-C4) aliphatic polyether copolymer or a polyamide-based aromatic polyamide- (C2-C4) aliphatic polyether copolymer.

The method of manufacturing an environmentally friendly buoy according to an embodiment of the present invention is a method of manufacturing an environmentally friendly buoy by introducing a separate support into a mold and introducing parison into the mold as in the present invention without using a method of molding the support body and the shell layer, And the like, and a separate support having high mechanical strength and relatively low density can be used. By virtue of these advantages, there is an advantage that the mechanical strength can be improved by the support even while securing the flexibility of the shell. Further, such supports may be in the form of forming a space in the interior of the buoyancy enhancement, but are not limited thereto.

The shape of such a support may vary depending on the shape of the completed buoy, but may be two or more, preferably three to five, of the abutting portion where the support and the shell come into contact with each other. More specifically, it may be a star shape (*) including five contact portions or ten cross shape including four contact portions after completion of the buoy. Further, the number of the supports may be determined in consideration of the size of the buoys, the intended use of the buoys, and the use environment, and specifically, 1 to 9, more specifically 2 To 5 < / RTI >

The eco-friendly buoy manufacturing method according to the present invention, as described above,

d) injecting the bead through an injection passage communicated to one side of the mold; And

e) foaming the beads to fill the parison.

The method of manufacturing eco-friendly buoy according to the present invention can produce eco-friendly buoys in one step without the necessity of various molding steps after foaming through the foaming of the beads described above, There are advantages. In the present invention, foamed beads formed by foaming the beads are referred to as foams.

In this case, the bead is not limited as far as it is a material capable of being foamed by heat treatment to form a foam, but may be at least one selected from polystyrene beads, polyethylene beads, polypropylene beads, polylactic acid beads and polyurethane beads, In terms of ensuring buoyancy, polystyrene beads can be used.

In the method of manufacturing a natural buoy according to an embodiment of the present invention, the foaming agent may be a physical foaming agent or a chemical foaming agent, although it is not limited if the foaming agent is capable of forming an air layer on the polymer resin. For example, the physical foaming agent is not limited if it is conventionally used, but one or two or more selected from organic-based physical foaming agents such as aliphatic hydrocarbons, halogenated hydrocarbons and the like and inorganic physical foaming agents may be mixed and used. The aliphatic hydrocarbons mean C3 to C6 aliphatic hydrocarbons such as n-butane, i-butane or n-pentane, and the halogenated hydrocarbons include ethyl chloride, 2,3,3,3-tetrafluoro-1-propene Or a halogen-substituted aliphatic hydrocarbon such as trans-1,3,3,3-tetrafluoro-1-propene and the like. The chemical foaming agent may also be azodicarbon amide (ADCA), p, p'-oxybis (benzenesulfonyl hydrazide), dinitrosopentamethylene tetramine and one or more selected from dinitroso pentamethylenetetra mine (DPT), ptoluenesulfonylhydrazide and benzenesulfonyl hydrazide. More specifically, the blowing agent according to an embodiment of the present invention may be carbon dioxide. When carbon dioxide blowing agent is used, there is an advantage that the environmental pollution caused by the foaming agent can be reduced, and the foaming ratio suitable for the buoyancy can be exhibited.

In addition, the beads foamed by the foaming agent may have a foaming ratio of 30 to 80, more specifically 40 to 60, from the viewpoint of ensuring sufficient mechanical strength and buoyancy. Herein, the foaming ratio in the present invention means the ratio of the volume after foaming to the volume after foaming.

Further, the step of foaming the beads may be carried out differently depending on the foaming agent contained in the beads and the beads used, but it may be a step of heating to a high temperature, more specifically, You can use a blowing method inside the parison. Furthermore, it is needless to say that the temperature, the air injection time or the pressure can be appropriately controlled in consideration of the type of the bead used in a specific embodiment, the amount of the foaming agent contained in the bead, or the foaming rate.

In addition, according to an embodiment of the present invention,

In the step a), the parison may be a multi-layer parison composed of an outer parison and an inner parison. In the case of introducing such multi-layer parison, there is an advantage that the mechanical strength of the envelope itself can be improved while sufficiently securing the buoyancy of the buoy due to the comparatively small weight compared to simply increasing the thickness of the envelope itself.

Specifically, when constructing such a multi-layer parison, the outer parison and the inner parison may utilize a parison constructed of a different type of polymer resin. Specifically, the outer parison is in contact with water and may be a polyolefin-based resin having excellent weatherability in consideration of being directly exposed to the outside. Specifically, it may be a resin containing 80 wt% or more of high-density polyethylene. The inner parison does not require properties such as weatherability, but polyethylene terephthalate or polycarbonate can be used in terms of imparting high mechanical strength to the outer surface of the buoy, and more specifically, the coefficient of thermal expansion is a value between the sheath and the foam a can be used a polymer resin that has, in the case of the inner parison is more specifically a thermal expansion coefficient in a linear standard available ^-1 polymeric resin 7 × 10 ^-5 to 10 × 10 ^-5 ℃. When a polymer resin having a thermal expansion coefficient falling within the above range is used as an inner parison, the difference in thermal expansion coefficient described above causes a phenomenon in which the outer shell is lifted due to a difference in thermal expansion coefficient due to a difference in temperature between day and night and between summer and winter Can be prevented. By preventing lifting of the envelope, a relatively thin envelope is lost by lifting, and consequently, the inner foam can be prevented from being exposed to the outside. Furthermore, the outer and inner layers of the envelope made using the outer parison and the inner parison can each be between 1 and 20 mm, more specifically between 3 and 10 mm.

The inner parison and the outer parison may be introduced into the cavity in the form of a concentric circle, wherein the outer parison refers to a parison that is implanted in the outermost perimeter so as to abut the mold when the cavity is poured into the cavity An inner parison means a parison located inside the outer parison and then directly contacting the foam when the bead is foamed to form a foam.

According to another embodiment of the present invention, there is provided a method of manufacturing an environmentally friendly buoy, wherein the parison further comprises a foaming agent so that the outer layer is also foamed in the foaming step. At this time, the content of the foaming agent contained in the parison may vary depending on the type of the foaming agent used, but specifically, the foaming ratio of the parison foamed after the foaming step may be 3 to 20. In this case, after the buoy is taken out of the mold, it is further wrapped with a polyolefin-based sheet and sealed, whereby the outermost layer may be formed outside the buoy. Specifically, the step of forming the outermost layer may be carried out at 100 to 150 ° C, and in the case where the outermost layer is formed in the temperature range, some of the molten polyolefin outermost layer and a part of the sheathing layer may be mixed with each other, There is an advantage that the binding force can be further improved. The polyolefin resin forming the outermost layer may be a resin containing 80 wt% or more of high-density polyethylene as described above. The thickness of the outermost layer may be appropriately adjusted in consideration of buoyancy of the buoy, etc., 20 mm.

That is, the method of manufacturing an eco-friendly buoy according to an embodiment of the present invention foams the envelope. By forming the outermost layer once more, the foaming ratio increases toward the inside of the buoy, and the foam and the dense jacket do not come into direct contact with each other. It is possible to prevent lifting of the same outer layer.

The method of manufacturing an environmentally friendly buoy according to another embodiment of the present invention may further include spraying a foaming agent onto the inner surface of the parison before the step d). By spraying the foaming agent, the partially melted parison resin and the foaming agent can be mixed, and the inner surface of the sheath can be foamed at the foaming step, so that the foaming layer can be further included inside the sheath. More specifically, the foaming agent is sprayed onto the inner surface of the parison, and then the primary foaming process is carried out to form the inside of the envelope formed with the bent portion. By filling the bead inside the envelope formed with the bent portion and foaming the foam, And a foaming layer in the outer shell having the buffering action described above is further formed inside the outer shell layer to improve impact resistance.

At this time, the amount of the blowing agent sprayed on the inner surface of the shell varies depending on the type of the blowing agent used, and specifically, the blowing rate of the foam layer in the shell can be 3 to 20.

Specifically, a method of manufacturing an environment friendly buoy according to an embodiment of the present invention will be described in detail. First, the parison 100 is introduced into the cavity formed by the open molds 11 and 12. After the introduction of the parison, a blowing step of blowing air into the parison is performed, and then a bead inlet for injecting beads is formed on one side of the molded parison. The bead is injected into the formed bead injection port through the bead injection section 20 to be foamed, the mold is opened, and the bead injection port is sealed to finally complete the environmentally friendly buoy.

Hereinafter, the present invention will be described in detail with reference to examples. The embodiments described below are intended to facilitate the understanding of the present invention by those skilled in the art, and the scope of protection of the present invention is not limited to the embodiments described below.

[Example 1]

99.8% by weight of polypropylene (LG Chem, Grade: R-3410, MFR: 7.0 ± 1.0 (g / 10 min), MP: 144 ± 1.5 (C), H: 75 ± 5), ultraviolet absorber (Ciba Specialty Co., Tinuvin 918) and 0.1% by weight of an antioxidant (IRGANOX (R) 1010) is introduced into a blowing machine and heated so that the parison can be introduced into the mold. The thickness of the parison introduced into the mold was then 10 mm after blowing. After that, the mold was closed and air was injected by the blowing pin to form the shape of the envelope. Thereafter, the blowing pin was removed, a hole for filling the bead was formed on one side of the shell, polystyrene beads containing carbon dioxide blowing agent were injected, hot air of 110 DEG C was injected into the parison for 10 minutes, . After filling, the parison was taken out of the mold and an eco-friendly buoy was made by blocking the holes made for injection of the beads.

[Example 2]

The inner layer of the envelope formed by the inner corrugated sheet was made of the same material as that of Example 1 except that the parison composition was made into an outer parison and the polyethylene terephthalate resin was used as an inner corrugated sheet, Mm so as to produce an environment friendly buoy.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will recognize that many modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the claims set forth below, fall within the scope of the present invention.

11, 12 mold
100 parisons
20 bead injection part

Claims (11)

A method of manufacturing an environmentally friendly buoy having a polyolefin outer wall manufactured from Parison,
a) introducing a parison into a mold;
b) closing the mold;
c) blowing air into said parison by means of a blowing pin;
d) injecting the bead through an injection passage communicated to one side of the mold;
e) foaming the beads to fill the parison; And
f) opening the mold and removing the buoy from the mold;
Wherein the method comprises the steps of: The method of claim 1, wherein
Before step a)
a1) introducing the support into a mold comprising a cavity by means of a support loading pin;
a2) introducing the polyolefin parison into the mold so as to surround the periphery of the support. 3. The method of claim 2,
The method of manufacturing an eco-friendly buoy in which the support introduced into the mold is 1 to 9 in the step a1). 3. The method of claim 2,
Between the step b) and the step c)
b1) lowering the support loading pin. The method according to claim 1,
Wherein the polyolefin-based parison comprises at least one selected from low-density polyethylene and linear low-density polyethylene. The method according to claim 1,
Wherein the polyolefin-based parison further comprises an ultraviolet absorber. The method according to claim 1,
Wherein in the step a), the parison is a multi-layer parison composed of an outer parison and an inner parison. The method according to claim 1,
Wherein the parison further comprises a foaming agent, and the foaming ratio of the envelope foamed in the step (e) is 3 to 20 by the foaming agent. 9. The method of claim 8,
Further comprising the step of wrapping the taken-out buoy with a polyolefin-based sheet after the step (f). The method according to claim 1,
Spraying a foaming agent onto the inner surface of the parison prior to step d). A eco-friendly buoy manufactured by the method of any one of claims 1 to 10, comprising a foamed bead filled with a polyolefin-based outer wall and an interior.

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