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WO2017030335A1 - Rotational molding method for product having functional surface, and product molded by same method - Google Patents

Rotational molding method for product having functional surface, and product molded by same method Download PDF

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Publication number
WO2017030335A1
WO2017030335A1 PCT/KR2016/008959 KR2016008959W WO2017030335A1 WO 2017030335 A1 WO2017030335 A1 WO 2017030335A1 KR 2016008959 W KR2016008959 W KR 2016008959W WO 2017030335 A1 WO2017030335 A1 WO 2017030335A1
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WIPO (PCT)
Prior art keywords
product
mold
article
raw material
functional
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PCT/KR2016/008959
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French (fr)
Korean (ko)
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최병훈
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(주)엘렉스폴리테크
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Publication of WO2017030335A1 publication Critical patent/WO2017030335A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/52—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles

Definitions

  • an antimicrobial agent having an antimicrobial function on the inner surface of the article before the article is completely cooled, or other water-improving functions, etc.
  • the rotational powder molding method used to manufacture a large storage tank including a septic tank or a water supply tank utilizes the fluidity, floatability, and dispersibility of a powder resin polyethylene (HDPE, LDPE, LLDPE, etc.) itself.
  • the storage tank is heated by melting above the melting point by using a gas torch while supplying powder resin to the surface of the cavity or the workpiece of the preheated mold by using electrical characteristics. It is a method that can be easily manufactured, it does not need a facility for applying a separate pressure during the process, the mold can be manufactured inexpensively with a thin steel plate, and the hollow such as a water tank or buoyancy body by the rotation of the mold It is used to make articles.
  • an antibacterial agent having an antimicrobial effect on the powder resin in order to prevent the pinch (moss, etc.) or the growth of microorganisms in the state of storing water inside, or to prevent odor or other deterioration due to long-term storage of water
  • the masterbatch mixed with additives such as particles (metals and other minerals) and binders is used.
  • the surface of the antimicrobial particle is covered with a resin. Since the antimicrobial particles are mostly exposed to the inner surface of the water tank without being exposed to the inner surface of the water tank, a substantial antimicrobial function is not exhibited.
  • the coating surface is easily peeled off from the wall of the water tank due to the temperature change and the passage of time. A secondary pollution problem arises.
  • Patent Literature 1 discloses a technique for molding a powder containing a powder of pegmatite having an antimicrobial function by mixing it with a plastic raw material composition
  • Patent Literature 2 discloses a nano silver solution or powder in a weight of 0.01 to 10% by weight of a water bottle.
  • a pet water bottle containing nano silver and fragrance prepared by adding a natural fragrance into 0.01 to 3% by weight.
  • Patent Document 3 discloses a method of coating a substrate with a coating layer in which fungicide particles are dispersed, wherein the antimicrobial particles are placed on the substrate to be in contact with the environment.
  • Patent Document 1 Korean Registered Patent No. 10-0865117 (October 17, 2008) Name of the invention; Manufacturing method of plastic product with excellent antibacterial and antifungal properties
  • Patent Document 2 Korean Patent Publication No. 10-2006-0083542 (July 21, 2006) Name of the invention; Pet Bottle with Nano Silver and Scent
  • Patent Document 3 Korean Patent Publication No. 10-2011-0106269 (2011.09.28.) The name of the invention; Manufacturing method of antimicrobial coating
  • the present invention has been made to solve the above problems, but the inner surface of the article manufactured by rotational molding, such as water tank to have an excellent antibacterial or water quality improvement function, but can be manufactured at a low cost, such a function SUMMARY OF THE INVENTION
  • a method of rotationally molding an article having a functional surface that can be continuously maintained and various kinds of articles molded by the method is provided.
  • the present invention is the input step of injecting the powdered resin raw material into the mold, by rotating and heating the mold, the powdered resin raw material is fused or sintered adjacent powder resin raw materials while melting the powder resin raw material according to the shape of the mold inner wall Molding step; Cooling step of cooling while rotating the mold; And a demolding step of demolding the cooled product by opening the mold, wherein various functional particles including an antimicrobial agent, a water quality improving agent, etc. before the surface of the product is cured between the molding step and the cooling step are formed on the inner surface of the product.
  • Articles that can be molded by the manufacturing method of the present invention is a water tank (storage tank), a septic tank, various fluid storage tanks and a storage tank or buoyancy body (buoy) for aquatic products or aquatic structures, etc. It can impart excellent and lasting antibacterial and water quality functions to the inner surface of the article.
  • FIG. 1 is a flow chart showing a rotational molding process according to an embodiment of the present invention
  • Figure 2 is an enlarged cross-sectional view and main portion of the water tank with the antimicrobial agent applied to the inner surface by the manufacturing method of the present invention.
  • Figure 1 shows a rotational molding process according to an embodiment of the present invention
  • Figure 2 is a cross-sectional view and enlarged view of the main portion of the water tank coated with the antimicrobial agent by the manufacturing method of the present invention.
  • the raw material input step (S10) for injecting the powdered resin raw material into the mold A molding step (S20) in which the powder resin raw material is fused or sintered with adjacent powder resin raw materials while the mold is rotated and heated to melt the powder resin raw material according to the shape of the inner wall of the mold; Spraying the antimicrobial particles on the inner surface or the surface of the product before the surface of the product is cured so as to be deposited on the surface of the product molded from the powdered resin raw material (S30); Cooling step (S40) for cooling while rotating the mold; And a demolding step (S50) of demolding the cooled product by opening the mold.
  • the rotational molding method according to the present invention is a general rotational molding process of the input step (S10), the molding step 20, the cooling step (S40), the demolding step (S50) is carried out, the molding step (S20) and the cooling step ( The step (S30) of spraying the antimicrobial agent is added between S40), and the injection step (S10), molding step (S20), cooling step (S40) and demolding step (S50) of the powdered resin raw material are added to the present invention. Since it will be known by those skilled in the art in the field of rotational molding belonging to the specific description thereof will be omitted.
  • the spraying of the antimicrobial agent in the step (S30) may be carried out manually by using a spray gun according to the size of the article, by installing a separate mechanical spraying equipment on the inner surface (2) of the rotating article (1) nozzle stand, etc. It is possible to spray to the entire inner surface by injecting at the same time, or by spraying the nozzle unit forward and backward while locally spraying to make a uniform density throughout the inner surface.
  • the antimicrobial agent 4 is sprayed in a state where the surface temperature of the article 1 molded from the powdered resin material is lower than the molding step S20 at 280 ° C to 80 ° C. At the same temperature as the molding temperature, the surface of the article 1 is melted to a certain depth to the inside, and the sprayed antimicrobial agent 4 has a higher specific gravity than the powdered resin raw material, and the particle size of the antimicrobial agent 4 is in a powder state.
  • the particles of the antimicrobial agent 4 are subjected to centrifugal force and settle inside the surface 1 (inner surface; 2) of the article 1 formed of a powdered resin raw material. This is because the surface coating is not made.
  • the antimicrobial agent 4 when the antimicrobial agent 4 is sprayed in the state of the temperature of 280 °C to 80 °C while gradually lowering the surface temperature of the molded article (1) in the molding step (S20) article of the semi-melt state Partially deposited on the surface of the antimicrobial agent (4) particles are exposed to the outside of the inner surface (2) of the article 1 as shown in Figure 2, so that water or other stored inside the article
  • the antimicrobial agent (4) when the particles are subjected to the cooling step (S40) in a state where the particles are partially deposited (root embedded) (1) Since even the surface of the) is completely cured, the antimicrobial agent 4 deposited on the inner surface 2 of the molded article 1 is not easily separated and can exhibit a continuous antimicrobial effect.
  • the antimicrobial particles are sprayed onto the inner surface of the semi-molten state between the molding step and the cooling step, and are deposited on the inner surface. Since it exists on the surface (inner surface) that is needed, it will be able to exert a continuous and excellent antibacterial effect.
  • the functional particles such as the antimicrobial agent is preferably a mineral antimicrobial agent (zeolite, etc.) having a size of 150 ⁇ m ⁇ 0.01 ⁇ m, because the nozzle size of the conventional powder coating and other spray guns can be only 150 ⁇ m or less If the particle size is large, the part seen inside the product may have a feeling of sticking of foreign matter or make an uneven surface, which may cause misunderstanding of the quality of the product. Particle sizes of 150 to 0.01 ⁇ m are suitable for this purpose.
  • zeolite, etc. zeolite, etc.
  • the injection nozzle when the size of the functional particles increases, the injection nozzle must be manufactured separately. However, when the functional particles having the below-specified specifications are used, the process improvement is not required so that additional cost is not required. There is an advantage that can be manufactured at a cost.
  • the surface temperature and the rotational speed of the article 1 may be applied differently depending on the kind or size of the functional particles 4 so that the state in which the functional particles 4 are deposited on the surface of the article may be optimal. Can be.
  • the present invention is capable of selectively using only the particle size at a low production cost of various inorganic materials, such as not only the above-mentioned zeolite antimicrobial agent, but also have been studied to have an effect such as ocher, charcoal, and other water quality improvement, and decay inside the product as in the prior art. It is economical because it is possible to prevent the addition of more functional inorganic substances than necessary due to the part that is (settled) and does not function.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

The present invention relates to rotational molding of a relatively large resin product, such as a water tank or a float, which enables the product to exhibit excellent antibacterial or water quality improvement function by applying particles with water quality improvement function on the inner surface or the outer surface of the product. Provided is a rotational molding method comprising: an injecting step for injecting powdered resin material into a mold; a molding step for rotating and heating the mold so that the powdered resin material is molten according to the shape of the inner wall of the mold to be fused and sintered together with adjacent powdered resin material; a cooling step for cooling the mold by rotating the same; and a demolding step for opening the mold and removing a cooled product therefrom, wherein the method further comprises a step, between the molding step and the cooling step, for spraying functional particles on the inner surface or the surface of the product before the surface of the product is cured such that the particles are deposited on the surface of the product molded with the powdered resin material.

Description

기능성 표면을 갖는 물품의 회전성형방법 및 이 방법에 의해 성형된 물품Methods of rotational molding of articles having functional surfaces and articles molded by the methods
본 발명은 예를 들면 물탱크나 부력체와 같은 비교적 대형의 플라스틱 물품을 회전성형함에 있어서, 성형단계에 이어 물품이 완전히 냉각되기 전에 물품의 내면에 항균기능을 갖는 항균제나 기타 수질개선 기능 등을 갖는 기능성 입자를 분사하여 물품 표면에 침착(沈着)되도록 함으로써 우수한 항균기능 또는 수질개선기능을 지속적으로 발휘할 수 있도록 한 것이다.In the present invention, for example, in rotational molding of a relatively large plastic article such as a water tank or a buoyancy body, an antimicrobial agent having an antimicrobial function on the inner surface of the article before the article is completely cooled, or other water-improving functions, etc. By spraying the functional particles having to be deposited on the surface of the article (沈着) to be able to continue to exhibit excellent antibacterial function or water quality improvement function.
일반적으로 정화조나 급수탱크 등을 포함하는 대형 저장탱크를 제조하는 데 사용되는 회전분말성형공법은 분말 수지인 폴리에틸렌(HDPE, LDPE, LLDPE 등) 자체의 유동성과 부유성 및 분산성을 이용하여, 경우에 따라서는 전기적 특성을 이용하여 예열된 금형의 캐비티 혹은 피도장물의 표면에 분말 수지를 빈틈없이 공급하면서 가스 토치 등을 이용하여 융점 이상으로 가열하여 인접한 분말 수지끼리 융착 또는 소결이 이루어지게 됨으로써 저장탱크를 간편하게 제조할 수 있는 방법인데, 이는 공정 중 별도의 압력을 인가하기 위한 설비가 필요 없고, 금형도 얇은 철판 등으로 저렴하게 제조할 수 있으며, 금형의 회전에 의해 물탱크나 부력체와 같은 중공품(中空品)을 제조하는데 사용되고 있다.In general, the rotational powder molding method used to manufacture a large storage tank including a septic tank or a water supply tank utilizes the fluidity, floatability, and dispersibility of a powder resin polyethylene (HDPE, LDPE, LLDPE, etc.) itself. Depending on the electrical properties, the storage tank is heated by melting above the melting point by using a gas torch while supplying powder resin to the surface of the cavity or the workpiece of the preheated mold by using electrical characteristics. It is a method that can be easily manufactured, it does not need a facility for applying a separate pressure during the process, the mold can be manufactured inexpensively with a thin steel plate, and the hollow such as a water tank or buoyancy body by the rotation of the mold It is used to make articles.
한편, 물탱크의 경우에는 내부에 물이 저장된 상태에서 물때(이끼 등)가 끼거나 미생물이 번식하게 되는 것을 방지하거나 물의 장기 저장으로 인한 악취 또는 기타 변질을 방지하기 위하여 분말 수지에 항균성을 갖는 항균제 입자(금속 기타 광물) 및 바인더 등의 첨가제를 혼합한 마스터배치를 사용하고 있는데, 이와 같은 항균제를 혼합한 마스터배치를 사용하여 회전성형을 하게 되면 항균제 입자의 표면이 수지로 덮이게 되는 것은 물론, 항균제 입자가 물탱크의 내면에 대부분 노출되지 않고 물탱크 벽면의 내부에 위치하게 됨으로써 실질적인 항균기능이 발휘되지 못하게 되는 단점이 있다.Meanwhile, in the case of the water tank, an antibacterial agent having an antimicrobial effect on the powder resin in order to prevent the pinch (moss, etc.) or the growth of microorganisms in the state of storing water inside, or to prevent odor or other deterioration due to long-term storage of water The masterbatch mixed with additives such as particles (metals and other minerals) and binders is used. When rotation molding is carried out using the masterbatch mixed with such an antimicrobial agent, the surface of the antimicrobial particle is covered with a resin. Since the antimicrobial particles are mostly exposed to the inner surface of the water tank without being exposed to the inner surface of the water tank, a substantial antimicrobial function is not exhibited.
또, 가시적인 항균 효과를 발휘하기 위해서는 고가(高價)의 항균제를 다량 투입하여야 함으로써 마스터배치의 조제에 상당한 비용이 소요되게 되어 제품의 가격 경쟁력이 떨어지게 되는 문제점이 있으며, 항균제와 기타 첨가제의 다량 투입으로 인한 제품의 물성 약화로 인해 제품의 내구성이 저하되는 등의 부작용도 발생하고 있다.In addition, in order to exhibit visible antimicrobial effect, a large amount of expensive antimicrobial agent must be added, which requires a considerable cost to prepare a masterbatch, which reduces the price competitiveness of the product, and adds a large amount of antimicrobial agent and other additives. Due to the weakening of the physical properties of the product is also a side effect such as lowering the durability of the product.
또, 항균제를 물탱크의 내면에 바인더와 함께 도포하여 코팅하는 경우에는 온도변화 및 시간의 경과에 의해 코팅면이 물탱크 벽면으로부터 쉽게 박리되는 문제점이 발생하게 됨으로써 항균성능의 저하는 물론, 이물질로 인한 부차적인 오염 문제가 발생한다. In addition, when the antimicrobial agent is coated on the inner surface of the water tank together with a binder, the coating surface is easily peeled off from the wall of the water tank due to the temperature change and the passage of time. A secondary pollution problem arises.
특허문헌 1에는 항균 기능을 갖는 페그마타이트 미분쇄물을 함유하는 파우더를 플라스틱 원료 조성물에 혼합하여 성형하는 기술이 개시되어 있고, 특허문헌 2에는 나노 실버 용액 또는 분말을 물병의 중량에 0.01 내지 10 중량 %로 투입하고 천연 향기제를 0.01~3 중량 %로 투입하여 제조하는 나노 실버와 향이 함유된 애완동물용 물병이 개시되어 있다. 특허문헌 3에는 항균 입자가 기판에 위치하여 환경과 접촉하도로 하는, 살균제 입자가 분산된 코팅층으로 기판을 코팅하는 방법이 개시되어 있다. Patent Literature 1 discloses a technique for molding a powder containing a powder of pegmatite having an antimicrobial function by mixing it with a plastic raw material composition, and Patent Literature 2 discloses a nano silver solution or powder in a weight of 0.01 to 10% by weight of a water bottle. Disclosed is a pet water bottle containing nano silver and fragrance prepared by adding a natural fragrance into 0.01 to 3% by weight. Patent Document 3 discloses a method of coating a substrate with a coating layer in which fungicide particles are dispersed, wherein the antimicrobial particles are placed on the substrate to be in contact with the environment.
[선행기술문헌][Preceding technical literature]
[특허문헌][Patent Documents]
(특허문헌 1) 한국등록특허 제10-0865117호(2008.10.17.등록) 발명의 명칭; 우수한 항균 및 항곰팡이 특성을 갖는 플라스틱 제품의 제조방법(Patent Document 1) Korean Registered Patent No. 10-0865117 (October 17, 2008) Name of the invention; Manufacturing method of plastic product with excellent antibacterial and antifungal properties
(특허문헌 2) 한국공개특허 제10-2006-0083542호(2006.07.21.공개) 발명의 명칭; 나노 실버와 향이 함유된 애완 동물의 물병(Patent Document 2) Korean Patent Publication No. 10-2006-0083542 (July 21, 2006) Name of the invention; Pet Bottle with Nano Silver and Scent
(특허문헌 3) 한국공개특허 제10-2011-0106269호(2011.09.28.공개) 발명의 명칭; 항균 코팅의 제조방법(Patent Document 3) Korean Patent Publication No. 10-2011-0106269 (2011.09.28.) The name of the invention; Manufacturing method of antimicrobial coating
본 발명은 상기한 문제점을 해결하기 위하여 안출된 것으로, 물탱크 등과 같이 회전성형에 의해 제조되는 물품의 내면이 우수한 항균 또는 수질개선 기능 등을 갖도록 하되, 저렴한 비용으로 제조가 가능하고, 이러한 기능이 지속적으로 유지될 수 있는 기능성 표면을 갖는 물품의 회전성형방법 및 이 방법에 의해 성형된 다양한 종류의 물품을 제공하는 데 있다.The present invention has been made to solve the above problems, but the inner surface of the article manufactured by rotational molding, such as water tank to have an excellent antibacterial or water quality improvement function, but can be manufactured at a low cost, such a function SUMMARY OF THE INVENTION There is provided a method of rotationally molding an article having a functional surface that can be continuously maintained and various kinds of articles molded by the method.
상기한 목적을 달성하기 위하여 본 발명은 금형 내부에 분말 수지 원료를 투입하는 투입단계, 금형을 회전 및 가열하여 분말 수지 원료가 금형 내벽의 형상에 따라 용융되면서 인접한 분말 수지 원료끼리 융착 또는 소결이 이루어지는 성형단계; 금형을 회전시키면서 냉각시키는 냉각단계; 및 금형을 개방하여 냉각된 제품을 탈형하는 탈형단계로 이루어지는 회전성형방법으로, 상기 성형단계와 냉각단계 사이에 제품의 표면이 경화되기 전에 항균제나 수질개선제 등을 포함하는 각종 기능성 입자를 제품의 내면 또는 표면에 분사하여 분말 수지 원료로 성형된 제품의 표면에 침착(沈着)되도록 하는 단계를 추가한 기능성 표면을 갖는 물품의 회전성형방법을 제공하여 기능성 입자의 표면이 물품의 벽면 내부에 완전히 매립되지 않고 일부만 침착되고 일부는 외부로 노출된 상태를 이루어 물이나 기타 저장물과의 접촉시 항균기능 또는 수질개선기능 등을 효과적으로 발휘할 수 있도록 한다. In order to achieve the above object, the present invention is the input step of injecting the powdered resin raw material into the mold, by rotating and heating the mold, the powdered resin raw material is fused or sintered adjacent powder resin raw materials while melting the powder resin raw material according to the shape of the mold inner wall Molding step; Cooling step of cooling while rotating the mold; And a demolding step of demolding the cooled product by opening the mold, wherein various functional particles including an antimicrobial agent, a water quality improving agent, etc. before the surface of the product is cured between the molding step and the cooling step are formed on the inner surface of the product. Or by spraying the surface and depositing it on the surface of the molded article made of powdered resin raw material, thereby providing a rotational molding method of the article having a functional surface so that the surface of the functional particles is not completely embedded in the wall of the article. Some of them are deposited and some are exposed to the outside, so that they can effectively exert antibacterial or water quality functions when contacted with water or other storage.
본 발명의 제조방법에 의해 성형될 수 있는 물품은 물탱크(저수탱크), 정화조, 각종 유체 저장조 및 수산물 양식 또는 수상 구조물을 위한 저장조나 부력체(부구) 등이며, 이 외에도 다양한 용도로 사용되는 물품의 내면에 우수하고도 지속적인 항균, 수질개선 등의 기능을 부여할 수 있다.Articles that can be molded by the manufacturing method of the present invention is a water tank (storage tank), a septic tank, various fluid storage tanks and a storage tank or buoyancy body (buoy) for aquatic products or aquatic structures, etc. It can impart excellent and lasting antibacterial and water quality functions to the inner surface of the article.
종래 마스터 배치를 사용하는 물품의 항균처리 방법에서는 항균제를 분말 수지와 혼합하여 마스터배치를 제조하는데 고가의 비용이 소요되고, 고가의 항균제 또한 다량 투입되는 반면에 항균효과는 미미하였고, 바인더를 이용한 코팅방법에서는 코팅이 쉽게 벗겨지게 되는 문제점이 있었으나, 본 발명에 의하면 회전성형공정에서 물품이 냉각되기 전에 항균제를 분사하여 침착되도록 함으로써 미량의 항균제를 사용하여 물품의 표면에서 외부로 노출되도록 결합되므로 항균 효과가 우수하고 항균성이 장기간 지속될 수 있는 효과를 갖는다.In the antimicrobial treatment method of articles using a master batch, it is expensive to prepare a master batch by mixing an antimicrobial agent with a powder resin, and an expensive antimicrobial agent is also added in a large amount while the antimicrobial effect is insignificant, and the coating using a binder In the method, there was a problem in that the coating was easily peeled off, but according to the present invention, by spraying the antimicrobial agent and depositing the antimicrobial agent before the article is cooled in the rotational molding process, the microbial agent is used to expose the external surface from the surface of the article. Has excellent and antimicrobial effect that can last for a long time.
도 1은 본 발명의 일 실시 예에 의한 회전성형공정을 도시한 플로우차트,1 is a flow chart showing a rotational molding process according to an embodiment of the present invention,
도 2는 본 발명의 제조방법에 의해 내면에 항균제가 도포된 물탱크의 단면도 및 요부 확대도이다.Figure 2 is an enlarged cross-sectional view and main portion of the water tank with the antimicrobial agent applied to the inner surface by the manufacturing method of the present invention.
이하, 본 발명을 한정하지 않는 바람직한 실시 예를 첨부된 도면에 의하여 상세히 설명하기로 한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments that do not limit the present invention will be described in detail.
이하의 설명에서는 항균기능을 갖는 실시 예에 대하여서만 설명하지만, 본 발명은 이에 한정되지 않고 수질개선기능이나 방오기능 등을 포함하는 다양한 기능성 표면을 갖는 물품의 성형에도 그대로 적용될 수 있음은 물론이다.In the following description, only an embodiment having an antimicrobial function will be described, but the present invention is not limited thereto, and the present invention can be applied to molding of articles having various functional surfaces including water quality improvement and antifouling functions.
도 1에는 본 발명의 실시 예에 의한 회전성형공정이 도시되어 있고, 도 2에는 본 발명의 제조방법에 의해 내면에 항균제가 도포된 물탱크의 단면도 및 요부 확대도가 도시되어 있다.Figure 1 shows a rotational molding process according to an embodiment of the present invention, Figure 2 is a cross-sectional view and enlarged view of the main portion of the water tank coated with the antimicrobial agent by the manufacturing method of the present invention.
본 실시 예에서는 금형 내부에 분말 수지 원료를 투입하는 원료 투입단계(S10); 금형을 회전 및 가열하여 분말 수지 원료가 금형 내벽의 형상에 따라 용융되면서 인접한 분말 수지 원료끼리 융착 또는 소결이 이루어지는 성형단계(S20); 제품의 표면이 경화되기 전에 항균제 입자를 제품의 내면 또는 표면에 분사하여 분말 수지 원료로 성형된 제품의 표면에 침착(沈着)되도록 하는 단계(S30); 금형을 회전시키면서 냉각시키는 냉각단계(S40); 및 금형을 개방하여 냉각된 제품을 탈형하는 탈형단계(S50)로 이루어져 있다.In the present embodiment, the raw material input step (S10) for injecting the powdered resin raw material into the mold; A molding step (S20) in which the powder resin raw material is fused or sintered with adjacent powder resin raw materials while the mold is rotated and heated to melt the powder resin raw material according to the shape of the inner wall of the mold; Spraying the antimicrobial particles on the inner surface or the surface of the product before the surface of the product is cured so as to be deposited on the surface of the product molded from the powdered resin raw material (S30); Cooling step (S40) for cooling while rotating the mold; And a demolding step (S50) of demolding the cooled product by opening the mold.
본 발명에 의한 회전성형방법에서는 일반적인 회전성형공정인 투입단계(S10), 성형단계(20), 냉각단계(S40), 탈형단계(S50)로 진행되며, 상기 성형단계(S20)와 냉각단계(S40) 사이에 항균제를 분사하여 침착시키는 단계(S30)가 추가되는 것으로, 분말 수지 원료의 투입 단계(S10), 성형단계(S20), 냉각단계(S40) 및 탈형단계(S50)에 대하여는 본 발명이 속한 회전성형분야에서 통상의 당업자에 의해 주지하는 바이므로 이에 대한 구체적인 설명은 생략하기로 한다.In the rotational molding method according to the present invention is a general rotational molding process of the input step (S10), the molding step 20, the cooling step (S40), the demolding step (S50) is carried out, the molding step (S20) and the cooling step ( The step (S30) of spraying the antimicrobial agent is added between S40), and the injection step (S10), molding step (S20), cooling step (S40) and demolding step (S50) of the powdered resin raw material are added to the present invention. Since it will be known by those skilled in the art in the field of rotational molding belonging to the specific description thereof will be omitted.
이하에서는 상기 항균제 침착 단계(S30)에 대하여 설명하기로 한다.Hereinafter, the antimicrobial agent deposition step (S30) will be described.
상기 단계(S30)에서 항균제의 분사는 물품의 크기에 따라서 스프레이 건을 사용하여 수작업으로 진행할 수도 있고, 별도의 기계적인 분사설비를 설치하여 회전중인 물품(1)의 내면(2)에 노즐대 등을 투입하여 전체 내면에 대하여 동시에 분사하거나 또는 국부적으로 분사하면서 노즐대를 진퇴작동시켜 내면 전체에 균일한 밀도가 되도록 분사시킬 수 있다.The spraying of the antimicrobial agent in the step (S30) may be carried out manually by using a spray gun according to the size of the article, by installing a separate mechanical spraying equipment on the inner surface (2) of the rotating article (1) nozzle stand, etc. It is possible to spray to the entire inner surface by injecting at the same time, or by spraying the nozzle unit forward and backward while locally spraying to make a uniform density throughout the inner surface.
상기 항균제 침착 단계(S30)는 분말 수지 원료로 성형된 물품(1)의 표면 온도가 상기 성형단계(S20) 보다는 낮은 280℃~80℃의 상태에서 항균제(4)가 분사되는 것이 바람직한데, 이는 성형온도와 같은 온도에서는 물품(1)의 표면은 물론 내부까지 어느 정도 깊이까지도 용융된 상태이고, 분사된 항균제(4)가 분말 수지 원료보다 비중이 높으며, 항균제(4)의 입자 크기가 파우더 상태이며, 반 용융 상태의 물품(1)은 회전하고 있으므로 항균제(4) 입자가 원심력을 받게 되면서 분말 수지 원료로 형성된 물품(1)의 표면(내면; 2)을 지나 내부로 침강(沈降)하게 됨으로써 표면 코팅이 이루어지지 않게 되기 때문이다.In the antimicrobial agent deposition step (S30), it is preferable that the antimicrobial agent 4 is sprayed in a state where the surface temperature of the article 1 molded from the powdered resin material is lower than the molding step S20 at 280 ° C to 80 ° C. At the same temperature as the molding temperature, the surface of the article 1 is melted to a certain depth to the inside, and the sprayed antimicrobial agent 4 has a higher specific gravity than the powdered resin raw material, and the particle size of the antimicrobial agent 4 is in a powder state. Since the article 1 in the semi-melt state is rotating, the particles of the antimicrobial agent 4 are subjected to centrifugal force and settle inside the surface 1 (inner surface; 2) of the article 1 formed of a powdered resin raw material. This is because the surface coating is not made.
따라서, 상기 성형단계(S20)에서 성형된 물품(1)의 표면 온도를 단계적으로 낮추면서 상기 온도인 280℃~80℃의 상태에서 항균제(4)를 분사하게 되면 항균제 입자가 반 용융 상태의 물품 표면에 부분적으로 침착(沈着)되어 항균제(4) 입자의 일부는 도 2에 도시된 바와 같이 물품(1)의 내면(2) 외부로 노출된 상태를 이루게 되므로 물품의 내부에 저장되는 물이나 기타 유체와의 접촉시 항균기능을 발휘할 수 있게 되는 것이며, 항균제(4) 입자가 물품(1)에 일부 침착된 상태(뿌리가 박힌 상태)에서 상기 냉각단계(S40)를 거치게 되면 성형된 물품(1)의 표면까지도 완전히 경화되므로 성형된 물품(1)의 내면(2)에 침착된 항균제(4)는 쉽게 분리되지 않게 되어 지속적인 항균 효과를 발휘할 수 있는 것이다.Therefore, when the antimicrobial agent 4 is sprayed in the state of the temperature of 280 ℃ to 80 ℃ while gradually lowering the surface temperature of the molded article (1) in the molding step (S20) article of the semi-melt state Partially deposited on the surface of the antimicrobial agent (4) particles are exposed to the outside of the inner surface (2) of the article 1 as shown in Figure 2, so that water or other stored inside the article When the contact with the fluid will be able to exert an antimicrobial function, the antimicrobial agent (4) when the particles are subjected to the cooling step (S40) in a state where the particles are partially deposited (root embedded) (1) Since even the surface of the) is completely cured, the antimicrobial agent 4 deposited on the inner surface 2 of the molded article 1 is not easily separated and can exhibit a continuous antimicrobial effect.
이와 같이 본 실시 예에 의한 회전성형방법에서는 항균제 입자를 성형 단계와과 냉각 단계의 사이에 반 용융상태의 물품 내면에 분사하여 내면에 침착된 상태가 되며 이와 같은 상태에서 냉각 단계를 거치게 되면 항균제 입자가 필요로 하는 표면(내면)에 존재하게 되므로 지속적이면서도 우수한 항균 효과를 발휘할 수 있게 되는 것이다.As described above, in the rotational molding method according to the present embodiment, the antimicrobial particles are sprayed onto the inner surface of the semi-molten state between the molding step and the cooling step, and are deposited on the inner surface. Since it exists on the surface (inner surface) that is needed, it will be able to exert a continuous and excellent antibacterial effect.
본 발명에서, 상기 항균제 등의 기능성 입자는 그 크기가 150㎛~0.01㎛인 광물성 항균제(제올라이트 등)인 것이 바람직한데, 그 이유는 기존의 분체도장 및 기타 스프레이 건의 노즐 사이즈가 150㎛ 이하만 가능하며, 입자 크기가 클 경우에는 제품의 내부에서 보여지는 부분이 이물질이 달라붙은 느낌이 있거나 고르지 못한 표면을 이루게 됨으로써 제품의 품질에 대한 오해를 불러일으킬 수 있기 때문이며, 항균제 등의 분사시 균일한 분포를 위해 150~0.01㎛의 입자 크기가 적합하다.In the present invention, the functional particles such as the antimicrobial agent is preferably a mineral antimicrobial agent (zeolite, etc.) having a size of 150㎛ ~ 0.01㎛, because the nozzle size of the conventional powder coating and other spray guns can be only 150㎛ or less If the particle size is large, the part seen inside the product may have a feeling of sticking of foreign matter or make an uneven surface, which may cause misunderstanding of the quality of the product. Particle sizes of 150 to 0.01 μm are suitable for this purpose.
또한, 기능성 입자의 크기가 커지면 분사용 노즐을 별도로 제작하여야 하나 위에서와 같이 제시된 규격 이하로 된 기능성 입자를 사용하게 되면 공정개선이 그다지 필요하지 않아 추가비용이 소요되지 않으므로 부가가치가 높은 제품을 최소의 비용으로 제조할 수 있는 이점이 있다.In addition, when the size of the functional particles increases, the injection nozzle must be manufactured separately. However, when the functional particles having the below-specified specifications are used, the process improvement is not required so that additional cost is not required. There is an advantage that can be manufactured at a cost.
본 발명에서, 상기 물품(1)의 표면 온도 및 회전속도는 기능성 입자(4)의 종류나 크기 등에 따라 다르게 적용함으로써 기능성 입자(4)가 물품의 표면에 침착되는 상태를 최적의 상태가 되도록 할 수 있다.In the present invention, the surface temperature and the rotational speed of the article 1 may be applied differently depending on the kind or size of the functional particles 4 so that the state in which the functional particles 4 are deposited on the surface of the article may be optimal. Can be.
본 발명은 상술한 제올라이트 항균제뿐만 아니라 황토나 숯, 기타 수질개선 등의 효과가 있다고 연구된 다양한 무기물 등을 낮은 생산단가로 입자크기만 선택적으로 사용하여 작업이 가능하며, 종래와 같이 제품 내부에 함몰(침강)되어 기능을 발휘하지 못하는 부분 때문에 필요 이상의 기능성 무기물 등을 첨가하는 것을 방지할 수 있어 경제적이다.The present invention is capable of selectively using only the particle size at a low production cost of various inorganic materials, such as not only the above-mentioned zeolite antimicrobial agent, but also have been studied to have an effect such as ocher, charcoal, and other water quality improvement, and decay inside the product as in the prior art. It is economical because it is possible to prevent the addition of more functional inorganic substances than necessary due to the part that is (settled) and does not function.
[부호의 설명][Description of the code]
1 : 회전 성형 물품1: rotationally molded articles
2 : 내면2: inside
3 : 외면3: exterior
4 : 항균제(기능성 입자)4: antibacterial agent (functional particle)

Claims (5)

  1. 금형 내부에 분말 수지 원료를 투입하는 원료 투입 단계, 금형을 회전 및 가열하여 분말 수지 원료가 금형 내벽의 형상에 따라 용융되면서 인접한 분말 수지 원료끼리 융착 또는 소결이 이루어지는 성형 단계; 금형을 회전시키면서 냉각시키는 냉각 단계; 및 금형을 개방하여 냉각된 제품을 탈형하는 탈형 단계로 이루어지는 회전성형방법으로,A raw material input step of injecting the powder resin raw material into the mold, and a molding step in which the powder resin raw material is fused or sintered between adjacent powder resin raw materials while the powder resin raw material is melted according to the shape of the mold inner wall by rotating and heating the mold; A cooling step of cooling while rotating the mold; And a demolding step of demolding the cooled product by opening the mold.
    상기 성형 단계와 냉각 단계 사이에 제품의 표면이 경화되기 전에 기능성 입자를 제품의 내면 또는 표면에 분사하여 분말 수지 원료로 성형된 제품의 표면에 침착(沈着)되도록 하는 단계가 추가되는 것을 특징으로 하는 기능성 표면을 갖는 물품의 회전성형방법.Between the forming step and the cooling step, before the surface of the product is cured, the step of spraying the functional particles on the inner surface or the surface of the product is characterized in that the step of being deposited on the surface of the product molded of powdered resin raw material A method of rotational molding of an article having a functional surface.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 기능성 입자 침착 단계는 분말 수지 원료로 성형된 제품의 표면 온도가 280℃~80℃의 상태에서 기능성 입자가 분사되는 것을 특징으로 하는 기능성 표면을 갖는 물품의 회전성형방법.The functional particle deposition step is a rotational molding method of an article having a functional surface, characterized in that the functional particles are sprayed in the state that the surface temperature of the product molded from the powdered resin raw material is 280 ℃ ~ 80 ℃.
  3. 청구항 1에 있어서,The method according to claim 1,
    상기 기능성 입자는 입자크기가 150㎛~0.01㎛인 항균제 또는 수질개선제인 것을 특징으로 하는 기능성 표면을 갖는 물품의 회전성형방법.The functional particles are a rotational molding method of the article having a functional surface, characterized in that the particle size of the antimicrobial agent or water quality improver 150㎛ ~ 0.01㎛.
  4. 청구항 1에 있어서,The method according to claim 1,
    상기 기능성 입자는 에어 스프레이 건이나 노즐대로 분사되는 것을 특징으로 하는 기능성 표면을 갖는 물품의 회전성형방법.Wherein said functional particles are sprayed with an air spray gun or nozzle.
  5. 청구항 1 내지 4항 중의 어느 한 항에 의한 방법으로 성형된 기능성 표면을 갖는 물품.An article having a functional surface shaped by the method according to claim 1.
PCT/KR2016/008959 2015-08-20 2016-08-16 Rotational molding method for product having functional surface, and product molded by same method WO2017030335A1 (en)

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JPH10113938A (en) * 1996-10-11 1998-05-06 Tosoh Corp Rotational molding method and apparatus
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KR960010203A (en) * 1994-09-10 1996-04-20 황용순 Double structure molding method using resin
JPH10113938A (en) * 1996-10-11 1998-05-06 Tosoh Corp Rotational molding method and apparatus
KR20030028083A (en) * 2001-09-27 2003-04-08 김정모 Manufacturing method of resin concrete pipe using centrifugal force and manufacturing machine thereof
KR20100107870A (en) * 2009-03-27 2010-10-06 (주)신명 Mold for manufacturing of rotomoulded articles, rotomoulded articles using the mold and preparing for it
KR20140035599A (en) * 2012-09-14 2014-03-24 주식회사 쎄타텍 A method for powder injection molding and powder injection molded part

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