Classifications

• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
  • B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
• • 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
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/16—Making multilayered or multicoloured articles
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L57/00—Compositions of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J177/00—Adhesives based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Adhesives based on derivatives of such polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
  • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/01—Hydrocarbons

Definitions

• the present invention relates to a metal adhesive molding method and a product made by the method, and more specifically, to a metal adhesive molding method and a product made by the method which can prevent metal and resin from separating when injection molding is performed.
• Fig. 1 the method is as follows. [4] (I) A metal is formed in a predetermined shape by a press molding process or a cutting process using a lathe. [5] (2) A thermal bonding tape is prepared.
• a resin molding product having a predetermined shape is prepared by a general injection molding method.
• the invention is directed to a metal adhesive molding method in which a metal having an adhesive coated thereon is inserted into an injection mold and synthetic resin is directly injected onto the surface of the adhesive-coated metal.
• the adhesive is composed of 70-80wt% polyamide, 10-20wt% petroleum resin, 2-7wt% mineral oil, and 3-7wt% amino silane.
• the metal may be any one selected from stainless steel (SUS), aluminum (Al), titanium (Ti), magnesium (Mg), and zinc (Zn).
• the synthetic resin may be any one selected from polycarbonate (PC), acrylic resin, and Acrylonitrile-Butadiene-Styrene (ABS) resin.
• the synthetic resin may be injection-molded in a state where the adhesive is dried at normal temperature for more than 20 minutes after coating, and maintained at a temperature of 100-120 0 C for 20-40 minutes.
• the coating thickness of the adhesive may range from 40 to 80D.
• the temperature of an injection-molding cylinder may be set in the range of 280 to
• the pressure of the injection-molding cylinder may be set in the range of 58 to 65kgf/cm
• the temperature of the mold may be set in the range of 65 to 95 0 C
• cooling maintenance time may be set to more than 8 seconds.
• the invention is directed to a metal adhesive molding product in which the surface of a stainless steel or aluminum base material is combined with polycarbonate by an adhesive.
• the adhesive is composed of 70-80wt% polyamide, 10-20wt% petroleum resin, 2-7wt% mineral oil, and 3-7wt% amino silane.
• FIG. 1 is a process diagram showing an example of a conventional metal adhesive molding method.
• FIG. 2 is a process diagram showing a metal adhesive molding method according to an exemplary embodiment of the invention.
• a metal adhesive molding method involves first forming a metal in prescribe shape, coating the metal with liquid adhesive, and inserting the metal having the adhesive coated thereon into an injection mold such that resin is then directly injection-molded.
• stainless steel (SUS) or aluminum is used as the metal.
• the forming of the metal is performed by a general forming method such as a press forming process, a cutting process, or a casting process.
• PC Poly Carbonate
• the adhesive is composed of 70-80wt% polyamide, 10-20wt% petroleum resin, 2-7wt% mineral oil, and 3-7% amino silane.
• the polyamide serving as basic resin provides adhesive strength such that bonding across a wide range of surfaces can be achieved. Further, the polyamide allows heterogeneous surfaces (SUS+PC, AL+PE or the like) having a large difference in surface energy to be easily bonded each other. If the amount of polyamide is less than 70wt%, the effect is insufficient. If the amount of polyamide exceeds 80wt%, the effect does not increase. Therefore, it is preferable that the amount of polyamide is set to 70-80wt%.
• the petroleum resin serving as a tackifier reduces a fusing temperature of adhesive and imparts a functional group in some cases such that a wetting property and adhesive strength at the initial stage of bonding can be enhanced. Further, the petroleum resin can adjust solidification time and the like. If the amount of petroleum resin is less than 10wt%, the above-described effect is not obtained. Further, if the amount of petroleum resin exceeds 20wt%, only a relative amount of polyamide is reduced without any improvement of the effect. Therefore, it is preferable that the amount of petroleum resin is set to 10-20wt%.
• the wetting property refers to a property of the adhesive getting tangled while spreading over surface of plastic injection-molding product.
• the petroleum resin which is distillate generated as a by-product in a refining process of petroleum or a petrochemical process, is the general term for plastic which is polymerized by various methods using raw materials including olefin and diolefin.
• the mineral oil is a plasticizer and serves as a lubricant of mixed resin so as to even out the fluidity and distribution of a mixture. Further, the mineral oil serves to prevent a mixture from being biased into a portion of a product. If the amount of mineral oil is less than 2wt%, it interferes with a flow of resin such that a finalized product is distorted. Further, if the amount of mineral oil exceeds 7wt%, fluidity excessively increases, so that resin can overflow from a mold in an injection-molding process.
• the amino silane which is an adhesive promoter or a curing agent, serves to enhance adhesive strength between a metallic base material and resin and to increase a wetting property between resin and inorganic matter.
• adhesive strength, curing time, and mechanical strength can be significantly changed. Therefore, the amount used needs to be carefully determined.
• 3-7wt% is preferable.
• the adhesive strength of the adhesive becomes the maximum. This is because, if the curing temperature of the adhesive is too low or the curing time is short, the adhesive can fall off or overflow, and if the curing temperature is too high or the curing time is long, the adhesive can be cured too fast or only partially cured before injection molding is performed, so that adhesive strength is weakened. Further, if the drying time at normal temperature is short, bubbles can occur in the adhesive, thereby decreasing adhesive strength.
• the adhesive is coated to a thickness of 40-80D. This is because, if the coating is too thin, the adhesive may partially come in contact with resin in the high- temperature injection molding process such that adhesive strength is weakened, and if the coating is too thick, the adhesive may fall off and overflow from the mold such that adhesive strength is weakened. Further, the adhesive may be included in synthetic resin which is to be bonded, thereby having an adverse effect.
• the adhesive is manufactured by a typical mixing method. That is, the above- described four components are put into a container and agitated using a general agitator, thereby forming the adhesive. Further, the adhesive can be kept in an airtight container at normal temperature.
• the adhesive used in the invention is thermosetting resin. When a temperature of more than 100 0 C is applied to the coated adhesive, a strong adhesive strength with metal is maintained while the adhesive is cured.
• the curing of the adhesive is maintained for about ten days after the adhesive is coated on metal. That is, when injection molding is performed within ten days after the adhesive is coated, an injection-molding product with a predetermined adhesive strength can be obtained.
• the adhesive strength of the adhesive is measured by measuring a force (or pressure) required to separate the injection-molded resin and the metallic base material using a vacuum nozzle.
• the temperature of a cylinder is set in the range of 280 to 300 0 C such that resin has a proper fluidity when injection molding is performed. That is, if the temperature is too low, the resin may be solidified before a product is molded. Further, if the temperature is too high, the adhesive melts and falls off from the metallic base material, thereby having an adverse effect upon an injection-molded product.
• the pressure of the injection-molding cylinder is set in the range of 58 to 65kgf/cm . If the pressure of the injection cylinder is too low, the shape of an injection-molding product is not well formed, and adhesive strength is weakened. Further, if the pressure of the injection-molding cylinder is too high, the adhesive may overflow.
• the temperature of the mold is set in the range of 65 to 95°C and cooling maintenance time is set in the range of 8 to 20 seconds. This is because, if the temperature of the mold is too low, synthetic resin may solidify before the molding is completed, and if the temperature is too high, the adhesive may fall off or overflow so that the adhesive strength between the resin and the base material is weakened. Further, if the cooling maintenance time is too short, the synthetic resin may deform before solidifying. If the cooling maintenance time is too long, productivity decreases. Of course, if productivity is not a concern, the cooling maintenance time may be set to more than 8 seconds.
• Injection-molding liquid of synthetic resin may be filled into the mold within 1.5 to
• Table 1 shows results where, when PC resin is combined with an SUS base material, the adhesive strength of the adhesive is measured while a weight ratio of the respective components composing the adhesive is changed.
• Table 2 lists measurements taken when PC was injection-molded into SUS, applying an adhesive composed of 75wt% polyamide, 15wt% petroleum resin, 5wt% mineral oil, and 5wt% amino silane, under eight different sets of conditions. [59] #1 corresponds to the present invention and all other numbers represent comparative examples. [60] As shown in Table 2, when the adhesive was applied under the conditions according to the invention, the adhesive strength of the adhesive was maintained.
• Table 3 lists results obtained when PC was injection-molded into SUS, applying an adhesive composed of 75wt% polyamide, 15wt% petroleum resin, 5wt% mineral oil, and 5wt% amino silane, under seven different sets of injection-molding conditions.
• a resin injection-molding product can be reliably combined with metal of a predetermined shape by an adhesive. Therefore, it is possible to obtain a reliable metal adhesive molding product.
• the metal adhesive molding method of the invention is simpler than a conventional method. Therefore, the number of processes and work can be reduced, which in turn reduces cost.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Adhesives Or Adhesive Processes (AREA)

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• 2007
  • 2007-05-09 KR KR1020070044976A patent/KR100792524B1/ko active IP Right Grant
  • 2007-06-05 JP JP2010500807A patent/JP2010522654A/ja active Pending
  • 2007-06-05 WO PCT/KR2007/002715 patent/WO2008140143A1/en active Application Filing
  • 2007-06-05 CN CNA2007800445728A patent/CN101547778A/zh active Pending
  • 2007-06-05 EP EP07807931A patent/EP2142350A4/de not_active Withdrawn

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