KR101502119B1 - Luminous cellular materials foam for amusement park rides support - Google Patents

Abstract

[0001] The present invention relates to an accumulative foam material for use in a playground structure column, and more particularly, to an EVA foam material which is obtained by blending ethylene vinyl acetate (EVA), which is excellent in compatibility with low density polyethylene (LDPE), followed by foaming using a foaming agent, The present invention relates to an extensible foaming material having good safety and being easily manufactured by blending.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] Luminous cellular materials foam for amusement park rides support,

[0001] The present invention relates to an accumulative foam material for use in a playground structure column, and more particularly, to an EVA foam material which is produced by blending ethylene vinyl acetate (EVA), which is excellent in compatibility with low density polyethylene (LDPE), followed by foaming using a foaming agent, The present invention relates to an accumulative foamed material for a pillow of a playground structure, which is produced by blending an inorganic phosphorescent pigment with good safety and easy to manufacture.

2. Description of the Related Art Conventionally, simple structures and playground structures to be installed in amusement parks, playgrounds, and the like are variously constructed of wood, metal materials, synthetic resin, etc., and are installed so as to be supported by pillars serving as main spindles.

The pillars of these structures are made of wood or metal. Wood is an eco-friendly material, so natural beauty can be saved, but deformation and destruction occur after a certain period of time due to contraction and expansion due to external temperature. In addition, although the metal material is robust, it has a disadvantage in that it is not good in safety because it is difficult to expect shock absorption because it is not good in touch, and when it is used for a long time, corrosion occurs and appearance is deteriorated.

In the case of playgrounds, due to the nature of the structure installation, many playground structures are installed in many places, so that children are frequently hit and often encounter safety accidents.

Recently, for example, in the case of Korean Utility Model Registration No. 020566, a technique of installing a buffer piece on the corner of a rectangular column of a structure has been suggested as a typical example of an attempt to secure the stability of a playground structure. However, , The cushioning material can easily be removed, which is also a weak point for maintenance and durability.

In the case of Korean Patent Registration No. 0920250, a technique of assembling and installing a perimeter cover having elasticity on a circular column of a structure has been proposed. In this case, since it depends on the elastic fitting force between the engaging projections and the engaging grooves, Is easily removed by an external force, and problems arise in terms of durability and composition.

Another disadvantage common to all of the conventional methods as described above is that the auxiliary cushioning material applied to the base structure ages, deforms, and breaks as time passes, resulting in poor collision safety and appearance And color is imparted when various colors or various kinds of color materials are used, but it is insufficient to secure stability until night.

On the other hand, Korean Patent Laid-Open Publication No. 1998-14509 relating to a foam material of a photopolymerizable resin is characterized in that a phosphorescent pigment is incorporated into a polymer foam combination of a resin or a rubber component, and as the polymer, ethylene vinyl acetate, polyethylene , Blowing agents and other additives are added to at least one selected from among resin components such as polypropylene, polystyrene, ethylene ethyl acrylate and polyvinyl chloride, and butadiene rubber, isoprene rubber and ethylene-propylene diene copolymer, A polymer foam produced by injection molding has been proposed.

However, such foamed materials have undesirable drawbacks in the characteristics of the playground structure exposed to the atmosphere, durability, weatherability, stretchability, etc., and it is difficult to apply the foamable material easily because it is not suitable for the playground structure. Further, when a phosphorescent pigment is applied to such a foamed material, there is a problem that various physical properties are deteriorated.

In order to solve the problems of the prior art as described above, the present invention provides a phosphorescent pigment which is harmless to the human body by using the structure as a foaming material, It is possible to detect the structure and to produce a structure having a beautiful appearance. After a long period of research, if the foaming property and the photostabilizing property are given to a specific resin mixture, it is easy to manufacture due to excellent workability, Stability and night visibility are very useful as pillars of an excellent structure. Thus, the present invention has been completed.

It is therefore an object of the present invention to provide an accumulative foaming material for low-density polyethylene and ethylene vinyl acetate as a main component and for a playground structure column.

Another object of the present invention is to provide an evaporative foam material for a pillar of a playground structure which is excellent in workability and has excellent durability, cold resistance, impact resistance, safety and night visibility at the same time.

Still another object of the present invention is to provide an elastic member having low density polyethylene and ethylene vinyl acetate as main components and having foaming and shrinking properties, and a structure column using the elastic member.

In order to solve the above-mentioned problems, the present invention provides an accumulative foam material for a pillow of a playground structure, wherein the low density polyethylene and the ethylene vinyl acetate are mixed at a weight ratio of 10 to 50:50 to 90 and foamed and contain a phosphorescent pigment.

The present invention also provides an elastic member made of an accumulative foaming material for the column of the structure.

Further, the present invention provides a column in which the elastic member is assembled to the column main body.

In order to enhance the stability of the product which has been problematic in safety, the present invention can improve the safety and beauty of the product when the existing product is applied to the pillars of the structure of the playground using a safe structure and harmless materials to the human body .

Further, the accumulative foam material according to the present invention is excellent in workability and is very easy to manufacture as an elastic member.

Further, the photographic foamable material according to the present invention is excellent in cold resistance, impact resistance, safety, and night visibility, and therefore, when applied to a column of a structure of a playground

First, since the elastic member having a circular cross-section is installed in the arc-shaped seating portion of the column, even when children are struck, the elastic member can appropriately absorb the impact, .

Second, since the elastic member for shock absorption is formed in a simple shape having a circular cross section, it is easy to manufacture and can be manufactured at a low cost.

Third, the life of the structure is prolonged due to the improved weatherability compared with the existing wooden and metal structures.

Fourth, by providing phosphorescence characteristics to the elastic member, it is possible to improve the convenience and safety in nighttime use in which the facility such as the pillars can be easily identified at night.

Fifth, it can replace existing children's playground cushions and can be used as a material to be developed in other industrial fields such as poles, street lamp posts, and facility guide posts.

FIG. 1 is a schematic view showing a use state of a column for a play facility according to an embodiment of the present invention.
FIG. 2 is a perspective view and an exploded perspective view showing an expanded state of a column for a play facility in FIG. 1, which is an embodiment of the present invention.

Hereinafter, the present invention will be described in detail as an embodiment.

The present invention relates to an extensional foaming agent blended with ethylene vinyl acetate (EVA) having excellent compatibility with low density polyethylene (LDPE), and a foamed material and a phosphorescent pigment are mixed.

Specific examples thereof include blends of ethylene vinyl acetate having excellent compatibility with low-density polyethylene excellent in impact resistance and cold resistance to improve impact resistance and processability, foaming using a chemical foaming agent or a gas blowing agent, and simultaneously luminescent pigment, Is a composition prepared by blending an inorganic phosphorescent pigment which is an alkaline earth metal aluminate complex activated by a metal ion.

According to the present invention, the low density polyethylene and ethylene vinyl acetate as main components are mixed in a weight ratio of 10 to 50:50 to 90, preferably 20 to 30:70 to 80, more preferably 1: 3 It is good to mix. In the present invention, it is preferable to use low density polyethylene having a specific gravity of 0.921 g / cm ³ and a melt index of 3.0 g / 10 min. Ethylene vinyl acetate preferably has a specific gravity of 0.940 g / cm ³ , a melt index of 1.8 g / And an acetate content of 19% can be preferably used.

In the present invention, any one or more of zinc oxide, a processing aid, and a crosslinking agent may be further mixed.

In the present invention, stearic acid may be used as an activator, and zinc oxide may be used as a foaming promoter in order to reduce the decomposition temperature of the foaming agent.

In the present invention, it is preferable to use a cross-linking agent and a processing aid when mixing the main components, and a foaming agent is used to foam and a phosphorescent pigment is mixed to constitute a blended extensional foaming agent. Dicumyl peroxide (DCP) and perbutyle peroxide (PBP) may be used as the cross-linking agent, and Dicumyl peroxide (DCP) may be preferably used as the cross-linking agent. As the foaming agent, azodicarbonate, p, p'-Oxybisbenzenesulfonylhydadize (OBSH), sodium bicarbonate (Kycerol series) and the like can be used.

In the present invention, a phosphorescent pigment is included. As the phosphorescent pigment, an inorganic phosphorescent pigment which is an alkaline earth metal aluminate complex activated with a rare earth metal ion may be used. The rare earth metal is used to activate at least one selected from the group consisting of Europium (Eu), Gadolinium (Gd), Dicyclopentium (Dy), Turbium (Tb) and Yttrium (Yb). The alkaline earth metal aluminate complex is a complex of salts of aluminum oxide and calcium oxide, strontium oxide or magnesium oxide, and specific examples thereof include Al ₂ O ₃ CaO, Al ₂ O ₃ MgO, SrAl ₂ O ₄ , SrAl ₂ O ₄ ( OH), and Al ₂ O ₃ CaOSrOB ₂ O ₃ .

Preferred compositions according to one embodiment of the present invention include 17.8-26.7 wt% low density polyethylene, 62.3-71.2 wt% ethylene vinyl acetate, 1-5 wt% zinc oxide (ZnO), 0.1-1 wt% stearic acid, 0.1 to 1% by weight of a crosslinking agent, 1-5% by weight of a foaming agent, and 1-15% by weight of a phosphorescent pigment.

As an example of the method for producing the foaming material of the present invention, LDPE and EVA among the raw materials are mixed and mixed in a mixer adjusted to 115-135 캜 according to the above composition, as a mixing step, based on the above raw materials and composition, Stearic acid and a foaming agent are mixed and mixed together, and then a cross-linking agent is added and mixed. (Mixing screw RPM: 45)

Next, the expansion step, while maintaining the pressure of the formulations of the proper blowing agent been added in a hydraulic press decomposition temperature (150-200 ℃) and 150kgf / cm ² (14.7Mpa) prepared as described above; for 20-30 minutes After the pressurization, N ₂ , CO ₂ , and CO ₂ gases are released at the same time as the decompression pressure, and a foamed material is produced.

The phosphorescent foam according to the present invention produced by this composition and method has a tensile strength of 1.8 to 2.2 MPa, a tear strength of 1.8 to 3.7 N / mm, a shore A type of 25 to 40, a foaming ratio of 120 to 185% And the like.

The accumulative foam member according to the present invention can be applied to a column, particularly a structure such as a playground, or a column such as an ordinary installation structure, which is applied to a structure as shown in FIGS. 1 and 2 as an embodiment.

According to an embodiment of the present invention, when the accumulative foamed material of the present invention is applied to a playground structure as shown in FIG. 1, for example, the column body 3 is attached to the column 2 supporting the structure of the slide 1, Molded in the form of an elastic member 4 which is inserted and assembled into the outer surface portion. 2 is a view showing the structure of the structure body 2 in the form of a column assembled in such a manner that the elastic member 4 having the wing portion 5 is pressed and inserted outside the column main body 3 of the hollow structure Can be used. At this time, when the elastic member 4 is configured to have the wings 5 symmetrically symmetrical to each other and inserted into the outer wall of the column main body 3, the elastic member 4 preferably absorbs external impact to ensure safety, The visibility can be secured at night while the appearance is good due to the luminescent effect of the accumulative foam material which is the material of the air bag.

FIG. 1 is a schematic view showing a state of use of a pole for a play facility according to an embodiment of the present invention. FIG. 2 is a perspective view showing an expanded state of the pole for a play facility in FIG. 1, Fig.

According to one embodiment of the present invention, a structure column using the phosphorescent material foamed material has a groove formed in the main body of the column, wherein an elastic member is assembled and coupled to the main body of the groove-formed circular column, The body portion of the elastic member is engaged with the groove of the column body so that the elastic body is engaged with the elastic body, The wing portion of the pillar body may be manufactured to have a structure in which the pillar body is partially assembled with the exposed surface of the pillar body in a close contact manner.

1 and 2, an example of application to the playground structure 1 is an elastic member having a cylindrical body and a column body 3 constituting the column 2, Is applied to the structure column (2) in a structure in which it is assembled and connected to a circular column body (3) having grooves formed in substantially the same shape and size as the cylindrical body of the elastic member (4) The elastic member 4 can be used as the column 2 of the rigidly and stably assembled and coupled structure between the column main body 3 and the elastic member 4, Due to the characteristics, it is possible to manufacture easily by the extrusion process or the injection process, and the cost reduction effect can be expected by improving the composition. Since the elastic member 4 in the state of the pillar 2 assembled in this way has a shape protruded from the outer peripheral surface of the column main body 3 while exposing a part of the outer circumferential surface of the cylindrical body which is hollow or filled with the elastic member 4, The wing portion 5 of the form continuously formed along the longitudinal direction of the main body 4 is assembled in such a form that it covers a part of the exposed surface of the column main body 3 and is applied to the playground structure 1, It is possible to achieve the effect that can be achieved.

The accumulative foaming material according to the present invention has a low density and is light in weight, and the structure of the column 2 can also be lightly formed in a hollow shape, so that the construction is very convenient and a cushioning feeling can be given by the elastic member 4. In addition, since it has excellent processability and is not corroded or rotted by the material, its lifetime is semi-permanent and exhibits phosphorescence characteristics, which is a material having a more beautiful appearance.

Accordingly, the present invention includes an elastic member for a column of a structure made of an accumulative foaming material and integrally joined to a groove of a column main body.

The present invention also includes a column in which the elastic member is assembled to the column main body.

When the elastic member is manufactured using the accumulative foam member according to the present invention and applied to the column, the elastic member can appropriately absorb the impact even in the event of collision, thereby preventing a safety accident. In addition, since the processability is excellent, it can be manufactured at low cost, and a cost saving effect can be expected.

Particularly, when such an accumulative foamed material of the present invention is applied, the lifespan of the structure is prolonged due to the improved weatherability compared with the existing wood and metal structures, and the convenience and safety at night can be increased, And can be applied to other fields such as telephone poles, lamp posts and facility guide posts.

In particular, such structures can be suitably applied to parks, children's playgrounds, and elderly care facilities.

The present invention can be expected to greatly improve workability of existing facilities. For example, when installing a play facility, it is necessary to clamp a corner of a plate and a column with a clamp when assembling a plate and a column In this case, there is a problem that three or more people must support the plate with the column and it takes much time to align the plate horizontally even after the plate is connected. The weight of the plate (25 Kg) and the length of the column 3600mm or more), safety problems frequently occurred.

However, in the case of using the foamed material of the present invention, since the housing is first assembled to the perforated plate, then the column is inserted and joined, and there is no need to support the plate, so that one person can easily assemble easily. In addition, when the housing is turned upside down at the lower part of the column, it can be used for joining the floor and structure (anchor can be installed), and it can be used as the roof support (small roof, It is possible to combine various structures with one housing metal mold. In addition, although the conventional clamping method is exposed to the outside of the column, it becomes a factor of a child safety accident. However, when the foam material of the present invention is used, the housing itself is also located inside the plate, .

Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited to the examples.

Example 1

Based on the raw materials and composition as shown in Table 1 below, LDPE and EVA in the raw materials were mixed in a mixer adjusted to 135 ° C for 10 minutes (mixing screw RPM: 45) according to the composition shown in Table 1, Add a foaming agent such as phosphorescent pigment, zinc oxide, stearic acid and azodicarbonate (ADCA # 1, manufactured by Kumanyang Co., Ltd.) and a crosslinking agent, and mix for 10 to 15 minutes. Then, as the foaming step, the mixture was heated in a hydraulic press for 20 minutes while maintaining the decomposition temperature of the foaming agent at an appropriate decomposition temperature and pressurized to 150 kgf / cm ² (14.7 Mpa) Manufacture into ash.

Example 2

Based on the raw materials and composition as shown in Table 1 below, LDPE and EVA in the raw materials were mixed in a mixer adjusted to 135 ° C for 10 minutes (mixing screw RPM: 45) according to the composition shown in Table 1, Zinc oxide, stearic acid, an azocarbonate blowing agent (ADCA # 2, manufactured by Kumyang Co., Ltd.) different from that of Example 1, and a cross-linking agent are mixed and mixed for 10 to 15 minutes. The blowing agent used in Example 2 emits more gas when decomposition temperature is higher and decomposition of blowing agent when compared with the foaming agent (ADCA # 1) used in Example 1. [ As the foaming step, the mixture is heated in a hydraulic press for 20 minutes while maintaining an appropriate decomposition temperature of the foaming agent and pressurized at a pressure of 150 kgf / cm ² (14.7 Mpa). .

Example 3

Based on the raw materials and composition as shown in Table 1 below, LDPE and EVA in the raw materials were mixed in a mixer adjusted to 135 ° C for 10 minutes (mixing screw RPM: 45) according to the composition shown in Table 1, Add a phosphorescent pigment, zinc oxide, stearic acid, a foaming agent and a cross-linking agent and mix for 10 to 15 minutes. As the foaming agent used in Example 3, 4,4'-Oxydibenzenesulfonylhydrazide (OBSH) foaming agent (manufactured by Koyang Co., Ltd.) having different kinds of foaming agents used in Example 1 was used. 4,4'-Oxydibenzenesulfonylhydrazide (OBSH) differs from the azodicarbonate blowing agent in that it is in the form of a white powder and releases a relatively small amount of gas when the blowing agent decomposes. As the foaming step, the mixture is heated in a hydraulic press for 20 minutes while maintaining an appropriate decomposition temperature of the foaming agent and pressurized at a pressure of 150 kgf / cm ² (14.7 Mpa). .

Example 4

Based on the raw materials and composition as shown in Table 1 below, LDPE and EVA in the raw materials were mixed in a mixer adjusted to 135 ° C for 10 minutes (mixing screw RPM: 45) according to the composition shown in Table 1, A phosphorescent pigment, zinc oxide, stearic acid, an azocarbonate-based foaming agent (ADCA # 2) different from that of Example 1, and a cross-linking agent are added and mixed for 10 to 15 minutes. The blend ratio of LDPE to EVA in Example 4 was mixed with 100 g of LDPE and 100 g of EVA in the same amounts as in the other examples. As the foaming step, the mixture is heated in a hydraulic press for 20 minutes while maintaining an appropriate decomposition temperature of the foaming agent and pressurized at a pressure of 150 kgf / cm ² (14.7 Mpa). .

The same procedure as in Example 1 was carried out except that 100 g of LDPE and 100 g of EVA were used to produce an accumulative foam.

Comparative Example

Based on the raw materials and composition as shown in Table 1 below, LDPE and EVA in the raw materials were mixed in a mixer adjusted to 135 ° C for 10 minutes (mixing screw RPM: 45) according to the composition shown in Table 1, Add a phosphorescent pigment, zinc oxide, stearic acid, an azocarbonate-based foaming agent (ADCA # 1) and a crosslinking agent, and mix for 10 to 15 minutes. The blend ratio of LDPE to EVA in the comparative example was 150 g of LDPE and 50 g of EVA, and the content of LDPE was larger than that of Example. Then, as the foaming step, the mixture was heated in a hydraulic press for 20 minutes while maintaining the decomposition temperature of the foaming agent at an appropriate decomposition temperature and pressurized to 150 kgf / cm ² (14.7 Mpa) Manufacture into ash.

Example 1 Example 2 Example 3 Example 4 Comparative Example LDPE 50 50 50 100 150 EVA 150 150 150 100 50 Zinc oxide 10 10 10 10 10 Processing aid 2 2 2 2 2 Phosphorescent pigment 40 40 40 40 40 blowing agent 6
(ADCA # 1) 6
(ADCA # 2) 6
(OBSH) 6
(ADCA # 1) 6
(ADCA # 1) Cross-linking agent 2 2 2 2 2

In Table 1, each value is the amount of usage in g.

Experimental Example

Table 2 shows the results of measuring the physical properties of the foaming materials prepared in the above Examples and Comparative Examples.

The tensile strength and elongation were measured according to KS M 1798 and the tear strength was measured according to KS M 6518. The hardness was measured as Shore A type and the foaming rate was calculated using the following equation 1.

(1)

(One)

: 냉각된 발포체의 대각선 길이

: Diagonal length of the cooled foam

: mold의 대각선 길이

: diagonal length of mold

As shown in Table 2, it was confirmed that the foaming materials of the examples according to the present invention were superior in the composition ratios in various physical properties such as strength, hardness and elongation, compared with the comparative examples out of the range of the present invention. Particularly, in comparison with the embodiment 1 and the comparative example, the effect of the embodiment 1 of the present invention is remarkably excellent. However, the foaming ratio and some physical properties can be adjusted depending on the type and content of the foaming agent.

Therefore, it is possible to achieve the object by the solution means of the present invention, and therefore, it has been confirmed that the present invention exhibits excellent effects as a foam material for a playground structure and is very useful.

1 - Playground structure
2 - Column
3 - Column body
4 - Elastic member
5 - wing portion

Claims (9)

delete And an inorganic phosphorescent pigment, which is an alkaline earth metal aluminate complex activated by rare earth metal ions while being foamed with low density polyethylene and ethylene vinyl acetate as main components, is mixed with 17.8-26.7% by weight of low density polyethylene, 62.3-71.2% by weight of ethylene vinyl acetate, A playground structure column comprising 1-5% by weight of zinc oxide (ZnO), 0.1-1% by weight of stearic acid, 0.1-1% by weight of a crosslinking agent, 1-5% by weight of a foaming agent and 1-15% Condensable foaming agent.
The playground structure according to claim 2, wherein the rare earth metal is at least one selected from the group consisting of Europium (Eu), Gadolinium (Gd), Dysprosium (Dy), Terbium (Tb) and Yttrium Condensable foaming materials for columns.
3. The accumulative foam material according to claim 2, wherein the alkaline earth metal aluminate complex is a composite of aluminum oxide and a salt composed of calcium oxide, strontium oxide or magnesium oxide.
[Claim 3] The shrinkable foam according to claim 2, wherein at least one of zinc oxide, a processing aid, and a crosslinking agent is further mixed.
delete An elastic member composed of an accumulative foam member for a pillar of any one of the playground structures according to any one of claims 2 to 5.
A pillar of a structure in which an elastic member composed of an accumulative foam member for a pillar of a playground structure selected from any one of claims 2 to 5 is assembled to the pillar body.
[10] The structure of claim 8, wherein the structural column is formed with a groove in the body of the column, wherein the elastic member is assembled to the body of the circular column having the grooves, wherein the elastic member comprises a part of the outer circumferential surface of the hollow cylindrical body The body of the elastic member is engaged with the groove of the column main body so that the wing portion of the elastic member is engaged with the exposed surface of the column main body, And a structure that is partially assembled and bonded in a state of being covered in a close state.

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