KR20030038034A - Epoxy Functional Silane Effects on Durability of FPL Treated Aluminum Alloy Bond - Google Patents

Epoxy Functional Silane Effects on Durability of FPL Treated Aluminum Alloy Bond Download PDF

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KR20030038034A
KR20030038034A KR1020010069440A KR20010069440A KR20030038034A KR 20030038034 A KR20030038034 A KR 20030038034A KR 1020010069440 A KR1020010069440 A KR 1020010069440A KR 20010069440 A KR20010069440 A KR 20010069440A KR 20030038034 A KR20030038034 A KR 20030038034A
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aluminum
fpl
epoxy
functional silane
bonding
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KR1020010069440A
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Korean (ko)
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우호광
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현대자동차주식회사
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Publication of KR20030038034A publication Critical patent/KR20030038034A/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • 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
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • 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
    • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins

Abstract

PURPOSE: A method for joining the oxidation-treated aluminium is provided, to improve the adhesive durability of aluminium by using an epoxy functional silane compound having an affinity to an epoxy adhesive. CONSTITUTION: The method comprises the steps of dipping the aluminium oxide which is formed by the forest products laboratory (FPL) oxidation method, into a solution of an organic functional silane represented by X3Si-R; washing the dipped aluminium oxide; and joining the washed aluminium oxide with an epoxy-based adhesive, wherein X is OH, and R is an epoxy functional group.

Description

산화처리된 알루미늄의 에폭시 기능성 실란을 통한 접합 내구강도 향상{Epoxy Functional Silane Effects on Durability of FPL Treated Aluminum Alloy Bond}Epoxy Functional Silane Effects on Durability of FPL Treated Aluminum Alloy Bond}

본 발명은 내구강도가 향상된 알루미늄의 접합방법에 관한 것으로서, 더욱 상세하게는 기존의 알루미늄 산화처리방법에 의해 생성된 알루미늄 산화물 층에 추가로 에폭시 기능성 실란 용액을 적용하여 알루미늄 접합 내구강도를 추가로 향상시키는 접합방법에 관한 것이다.The present invention relates to a method for bonding aluminum having improved oral resistance, and more particularly, to further improve aluminum bonding oral cavity by applying an epoxy functional silane solution to the aluminum oxide layer produced by a conventional aluminum oxidation treatment method. It relates to a bonding method to make.

현재 세계적인 자동차산업은 환경보호, 연비향상 및 대체 에너지원 자동차개발 등을 목표로 차체를 중심으로 한 구조물 경량화를 추구하고 있다. 상기 자동차 차체 경량화를 위하여 사용 가능한 재료로는 알루미늄, 플라스틱, 그리고 복합재료 등이 있으며, 현재 알루미늄의 경우 이미 차량 차체의 전반에 걸쳐 적용되고 있다.At present, the global automobile industry is pursuing the weight reduction of structures centering on the car body with the aim of protecting the environment, improving fuel efficiency and developing automobiles as alternative energy sources. The materials that can be used to reduce the weight of the vehicle body include aluminum, plastic, and composite materials, and at present, aluminum has already been applied to the entire body of the vehicle body.

이러한 강판을 포함하는 알루미늄 재질의 제조방법으로는 차체 조립을 위하여 일반적으로 용접 또는 리벳, 볼트/너트 등이 사용되어 왔다. 그러나, 최근 고분자 접착제를 이용한 접합기술이 개발되어 2차적 경량화 및 부식방지, 용접 후 도장공정 중 높은 오븐 온도에 노출시 발생 가능한 변형 방지, 및 용접시 발생되는 유해 가스의 작업환경 개선 등을 실현하고 있다.As a method of manufacturing an aluminum material including such a steel sheet, welding or rivets, bolts / nuts, etc. have been generally used for vehicle body assembly. However, recently, bonding technology using polymer adhesive has been developed to realize secondary weight reduction and corrosion prevention, prevention of deformation that may occur when exposed to high oven temperature during painting after welding, and improvement of working environment of harmful gas generated during welding. have.

상기 고분자 접착제를 이용한 차체 접합은 접합하고자 하는 면의 상태에 의해 결정적으로 좌우되므로 알루미늄의 경우에는 일반적으로 표면을 산화처리 한다. 이러한 처리방법은 알루미늄의 표면에 다공성 미세 산화물 층을 형성시켜 표면적, 즉 표면 조도를 증대시킴으로써 원하는 접착력을 얻을 수 있는 방법이다. 다음 표 1에 포레스트 프러덕트 래보래토리(Forest Products Laboratory, 이하, FPL라 함) 산화처리 방법을 나타내었다.Since the vehicle body bonding using the polymer adhesive depends critically on the state of the surface to be bonded, in the case of aluminum, the surface is generally oxidized. This treatment method is a method of obtaining a desired adhesion by forming a porous fine oxide layer on the surface of aluminum to increase the surface area, that is, the surface roughness. In Table 1, Forest Products Laboratory (hereinafter referred to as FPL) oxidation treatment method is described.

그러나, 상기 산화처리 방법은 높은 온도와 습한 지역에서 장기간 사용될 경우 접합 계면으로 확산되는 고온의 습기에 의해 산화물 층이 파괴되어 접합강도가 현저히 감소되는 문제점이 있다. 이와 같은 산화층 파괴에 의한 접합강도의 감소는 건조가 되어도 회복이 되지않아 구조물로서 계속 사용이 불가능하다.However, the oxidation treatment method has a problem in that the bonding strength is significantly reduced because the oxide layer is destroyed by high temperature moisture diffused to the bonding interface when it is used for a long time in a high temperature and a humid region. The decrease in the bonding strength due to the oxide layer breakdown is not recovered even when dried, and thus it is impossible to continue using the structure.

이에, 본 발명자들은 상기와 같은 문제점을 해결하기 위하여 연구한 결과, 기존의 알루미늄 산화처리(FPL 산화처리법)에 의해 생성된 알루미늄 산화물 층 위에 추가로 유기 기능성 실란 용액을 담금처리하여 내구 접합강도를 향상시킨 알루미늄의 접합방법을 개발함으로써 본 발명을 완성하게 되었다.Accordingly, the present inventors have studied to solve the above problems, and as a result, the organic functional silane solution is immersed on the aluminum oxide layer produced by the conventional aluminum oxidation treatment (FPL oxidation treatment) to improve the durability bond strength. The present invention has been completed by developing a method of joining aluminum.

따라서, 본 발명은 내구강도가 향상된 알루미늄의 접합방법을 2차적으로 개선 및 향상시키는데에 그 목적이 있다.Therefore, an object of the present invention is to secondaryly improve and improve the joining method of aluminum with improved oral resistance.

도 1은 본 발명에 따른 알루미늄 접합방법에 대하여 물성을 시험하기 위한 ASTM D 1002-72 표준시험 시편 및 방법을 나타낸 것이고,Figure 1 shows the ASTM D 1002-72 standard test specimens and methods for testing the properties of the aluminum bonding method according to the invention,

도 2는 본 발명에 따른 알루미늄 접합방법에 대하여 물성 시험 기기를 나타낸 것이다Figure 2 shows the physical property test apparatus for the aluminum bonding method according to the present invention.

본 발명은 FPL(Forest Products Laboratory) 산화처리방법에 의해 생성된 알루미늄 산화물 층 위에 다음 화학식 1로 표시되는 유기기능성 실란 용액을 담금처리한 후, 세척하고 에폭시계 접착제와 접합을 수행하는 내구강도가 향상된 알루미늄의 접합방법을 그 특징으로 한다:The present invention is improved after the immersion of the organic functional silane solution represented by the following formula (1) on the aluminum oxide layer produced by the FPL (Forest Products Laboratory) oxidation treatment, washing and bonding with the epoxy adhesive The method of joining aluminum is characterized by:

X3Si-RX 3 Si-R

상기 화학식 1에서, X는 물에 용해되어 OH그룹을 형성하게 되고, R은 에폭시 기능성 그룹을 나타낸다.In Formula 1, X is dissolved in water to form an OH group, and R represents an epoxy functional group.

이와 같은 본 발명을 더욱 상세하게 설명하면 다음과 같다.The present invention will be described in more detail as follows.

본 발명은 기존의 알루미늄 산화처리방법에 의해 생성된 알루미늄 산화물 층 위에 추가로 유기 기능성 실란 용액을 담금처리하여 사용하는데 특징이 있다. 이렇게 유기 실란 용액에 의해 표면이 활성화된 알루미늄은 에폭시계 접착제와 강한 화학결합을 이루게 된다.The present invention is characterized in that the organic functional silane solution is immersed in addition to the aluminum oxide layer produced by the conventional aluminum oxidation treatment method. The surface activated aluminum by the organic silane solution thus forms a strong chemical bond with the epoxy adhesive.

본 발명에서 사용하는 유기 기능성 실란 화합물은 상기 화학식 1로 표시되는 실란 화합물을 사용하며, 이는 무기물질 표면과 접착제 계면에서 강한 화학결합을 제공하는 물질이다.The organic functional silane compound used in the present invention uses the silane compound represented by Chemical Formula 1, which is a material that provides a strong chemical bond at the surface of the inorganic material and the adhesive.

상기 유기 실란 화합물의 무기물질 표면에서의 실란 반응은 다음 반응식 1 및 2에 나타낸 바와 같다. 반응식 1에서 보면, X 그룹은 물에 용해되어 (HO)3-Si-을 형성한 후 무기물질 표면의 OH 그룹 및 주위의 OH 그룹과 응축결합하고, 또한 R 그룹은 반응식 2에 나타낸 바와 같이 고분자 접착제와 화학결합을 형성한다. 따라서, 상기 R 그룹은 사용하고자 하는 접착제와의 화학적 반응성을 고려하여 선택하는 것이 바람직하다. 일례로, 무기물질 중 글래스(Glass)와 실란과 화학반응이 있으며, 이러한 반응은 금속(예를 들면, 강판)이나 알루미늄의 경우에도 동일하게 일어난다.The silane reaction on the surface of the inorganic material of the organosilane compound is shown in the following schemes 1 and 2. In Scheme 1, X group is dissolved in water to form (HO) 3-Si-, and then condensed with OH group and surrounding OH group on the surface of inorganic material, and R group is polymer as shown in Scheme 2. It forms a chemical bond with the adhesive. Therefore, the R group is preferably selected in consideration of chemical reactivity with the adhesive to be used. For example, there is a chemical reaction between glass and silane in the inorganic material, and the same reaction occurs in the case of metal (eg, steel sheet) or aluminum.

또한, 상기 유기 실란 화합물에 의한 알루미늄과 접착제의 화학결합은 다음반응식 3에 나타낸 바와 같다. 반응식 3에서 보면, 접착제와 실란, 실란과 금속으로 이어지는 1차적 화학결합을 나타내고 있으며, 이러한 1차적 결합의 결합력은 2차적 결합보다 약 50 ∼ 250 배 가량 강하다.In addition, the chemical bond of the aluminum and the adhesive by the organosilane compound is shown in the following scheme 3. In Scheme 3, primary chemical bonds leading to adhesives, silanes, silanes, and metals are shown, and the binding force of these primary bonds is about 50 to 250 times stronger than the secondary bonds.

상기 반응식 3에서와 같이, 접착제-실란-금속 간 반응이 형성된 후 높은 온도와 습기에 장시간 노출될 경우 실란과 금속간 화학결합이 끊어질 수 있으나, 이 결합은 건조시 다음 반응식 4와 같은 가역반응에 의해 다시 회복된다.As in Scheme 3, after the adhesive-silane-metal reaction is formed, when exposed to high temperature and moisture for a long time, the silane and the metal bond may be broken, but the bond may be reversible as shown in Scheme 4 below. Is recovered again.

M-O-Si + H2O ↔ M-O-H + H-O-Si-MO-Si + H 2 O ↔ MOH + HO-Si-

따라서, 본 발명은 알루미늄 금속을 상기 화학식 1로 표시되는 유기 기능성 실란 용액에 60 ℃의 온도에서 15분 동안 담금 처리한 후, 물로 세척하고 보관한다. 이때, 상기 실란 용액은 실란 화합물 : 메탄올 : 증류수의 혼합용액으로서, 그 혼합비는 1 : 25 : 74 (부피%)인 것이 바람직하다Therefore, the present invention, after immersing the aluminum metal in the organic functional silane solution represented by the formula (1) for 15 minutes at a temperature of 60 ℃, washed with water and stored. At this time, the silane solution is a mixed solution of silane compound: methanol: distilled water, and the mixing ratio is preferably 1:25:74 (vol%).

상기 과정 다음으로 유기 기능성 실란 화합물로 표면이 처리된 알루미늄을 에폭시계 접착제와 접합시킴으로써, 본 발명을 완성한다.After the above process, the present invention is completed by bonding aluminum treated with an organic functional silane compound with an epoxy adhesive.

이와 같이, 본 발명은 에폭시 접착제와 친화성이 있는 에폭시 기능성 실란 화합물을 사용하여 알루미늄 접합모재를 표면처리함으로써, 종래 산화처리 보다 내구강도 측면에서 더욱 향상되고, 1%의 용액으로 다량의 알루미늄 표면을 처리할 수 있어 원가도 절감될 뿐만 아니라 고분자 접착제를 사용함으로써 경량화와 같은 바람직한 결과를 얻을 수 있다.As described above, the present invention is further improved in terms of oral resistance than the conventional oxidation treatment by surface treatment of the aluminum bonding base material using an epoxy functional silane compound having affinity with an epoxy adhesive, and a large amount of aluminum surface with 1% solution Not only can the processing cost be reduced, but the use of a polymer adhesive can achieve desirable results such as weight reduction.

이하, 본 발명을 다음의 실시예에 의거하여 상세하게 설명하겠는바, 본 발명이 이들에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in detail based on the following examples, but the present invention is not limited thereto.

시험예Test Example

알루미늄 시편과 에폭시 접착제를 이용하여 ASTM D 1002-72 표준 시험방법 (Single Lap Shear Test)에 따라 각 조건 당 5개의 시편을 준비하여 시험/평가 하였다.Five specimens for each condition were prepared and tested / evaluated according to ASTM D 1002-72 Single Lap Shear Test using aluminum specimens and epoxy adhesive.

[기본 실험조건][Basic Experimental Conditions]

① 접합모재 (Adherend): 알루미늄 2024-T3(실험 전 아세톤 용액으로 표면 불순물 제거함).① Bonding substrate (Adherend): Aluminum 2024-T3 (remove surface impurities with acetone solution before experiment).

② 접착제 (Adhesive): 상온 응고되는 3-성분 에폭시를 사용하였다(Epon 433, Miller-Stephenson 사 제조).② Adhesive (Adhesive): A three-component epoxy solidified at room temperature was used (Epon 433, manufactured by Miller-Stephenson).

③ 산화처리: FPL 산화처리법(상기 표 1 참조)③ Oxidation treatment: FPL oxidation treatment (see Table 1 above)

④ 접합 가압력: 13.8 kPa④ Bonding force: 13.8 kPa

⑤ 시험편 제작 및 시험: ASTM D 1002-72(도 1)⑤ Test piece preparation and test: ASTM D 1002-72 (Fig. 1)

⑥ 접합강도 측정: 만능인장시험기 (Cross Head Speed 0.1 in/min)[INSTRON 사]를 사용하여 측정하였다(도 2).⑥ Bonding strength measurement: measured using a universal tensile tester (Cross Head Speed 0.1 in / min) [INSTRON company] (Fig. 2).

비교예Comparative example

실란 처리 없이 접합 초기강도 및 내구강도 측정하였다.Bonding strength and internal oral cavity were also measured without silane treatment.

즉, 상기 시험예의 기본 실험조건에 따라 접합 후 상온에서 7일간 응고 (Curing)하였다. 응고 후 즉시 상기 측정기를 이용하여 초기강도를 측정하였다. 내구강도 측정을 위해 60 ℃, 95% 상대습도 하에서 30일 보관하고, FPL 산화처리 후 상기 측정기를 이용하여 접합강도를 측정하였고 그 결과를 다음 표 2에 나타내었다.That is, it was solidified (Curing) for 7 days at room temperature after bonding according to the basic experimental conditions of the test example. Immediately after solidification, the initial strength was measured using the measuring device. In order to measure the internal oral cavity, it was stored at 60 ° C. and 95% relative humidity for 30 days. After FPL oxidation, the bond strength was measured using the measuring device. The results are shown in Table 2 below.

실시예Example

상기 시험예의 기본 실험조건에서와 같이 에폭시 접착제와 친화성이 있는 에폭시 기능성 실란()을 선택하여 사용하였다. 처리방법은, 1 vol.%의 실란을 25 vol.% 메탄올과 74 vol.% 증류수 용액에 섞은 후 약 1시간 동안 저어주었다. 접합모재의 접합될 부위를 본 용액에 약 15분 동안 담근 후 물로 세척하고 60 ℃에서 약 1시간 보관하였다. 이후 기본 실험조건에 따라 접합하여 접합 초기강도 및 내구강도를 측정하였다.Epoxy functional silane having affinity with epoxy adhesive as in the basic experimental conditions of the test example ( ) Was used. In the treatment method, 1 vol.% Of silane was mixed with 25 vol.% Methanol and 74 vol.% Distilled water solution, and then stirred for about 1 hour. The part to be bonded to the bonding base material was immersed in this solution for about 15 minutes, washed with water and stored at 60 ° C. for about 1 hour. Then, the initial strength and the oral cavity strength were measured by bonding according to the basic experimental conditions.

상기 재료와 시험 조건, 방법을 각 조건당 5회 시험 후 평균값을 취하여 그결과를 다음 표 2에 나타내었다.The material, test conditions, and methods were averaged after five tests for each condition, and the results are shown in Table 2 below.

상기 표 2에서 보면, 실란 처리가 알루미늄 내구강도의 추가적 향상에 매우 효과적임을 확인할 수 있었다.In Table 2, it was confirmed that the silane treatment is very effective in further improving the oral cavity of aluminum.

특히, 온도와 습도에 의해 감소되는 접합강도, 즉 계면에서 실란이 제공하는 화학결합의 분해반응은 건조시 회복되는 반응이므로 산화처리에 의한 경우보다 장기간 동안 실제 사용시 더욱 바람직함을 알 수 있다.In particular, it can be seen that the bonding strength reduced by temperature and humidity, that is, the decomposition reaction of the chemical bonds provided by the silane at the interface is more preferable in actual use for a long time than the case by the oxidation treatment because it is a reaction that is recovered during drying.

따라서, 본 발명은 생산성을 고려하여 적당한 접착제를 선정하고 차체 구조물 설계시 구조/응력해석과 병행된다면 승상용 차체 구조물(강판 및 알루미늄)에 효과적으로 적용 가능하다. 더욱이, 유기물질 (고분자 접착제, 페인트 등)과 무기물질 (금속 등)의 접합계면 강화방법이므로 차체 도장이나 복합재료 제조에도 응용 가능하다.Therefore, the present invention can be effectively applied to the ascending body structure (steel plate and aluminum) if the appropriate adhesive is selected in consideration of productivity and parallel to the structure / stress analysis when designing the body structure. Moreover, the method of strengthening the bonding interface between organic materials (polymer adhesives, paints, etc.) and inorganic materials (metals, etc.) is applicable to vehicle body coating and composite material manufacturing.

상기에서 설명한 바와 같이, 본 발명은 에폭시 접착제와 친화성이 있는 에폭시 기능성 실란 화합물을 사용하여 산화처리된 알루미늄 접합모재를 추가로 표면처리함으로써, 알루미늄 접합 내구강도를 추가적으로 향상시키는데 그 효과가 있다.As described above, the present invention has an effect of further improving the oral hardness of the aluminum bonding by further surface treatment of the aluminum bonded base material oxidized using an epoxy functional silane compound having affinity with the epoxy adhesive.

Claims (1)

FPL(Forest Products Laboratory) 산화처리방법에 의해 생성된 알루미늄 산화물 층 위에 다음 화학식 1로 표시되는 유기기능성 실란 용액을 담금처리한 후, 세척하고 에폭시계 접착제와 접합을 수행하는 것을 특징으로 하는 내구강도가 향상된 알루미늄의 접합방법:After the immersion treatment of the organofunctional silane solution represented by the following formula (1) on the aluminum oxide layer produced by the FPL (Forest Products Laboratory) oxidation method, the oral resistance characterized in that the washing and bonding with the epoxy-based adhesive Improved bonding method of aluminum: 화학식 1Formula 1 X3Si-RX 3 Si-R 상기 화학식 1에서, X는 OH그룹이고, R은 에폭시 기능성 그룹을 나타낸다.In Formula 1, X is an OH group, R represents an epoxy functional group.
KR1020010069440A 2001-11-08 2001-11-08 Epoxy Functional Silane Effects on Durability of FPL Treated Aluminum Alloy Bond KR20030038034A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020053175A (en) * 2000-12-27 2002-07-05 이계안 A method for boding aluminum adherend using secondary amine silane as a bonding promotor
KR20020053174A (en) * 2000-12-27 2002-07-05 이계안 A method for bonding aluminum adherend using primary amine silane as a bonding promotor
KR100391303B1 (en) * 2001-07-11 2003-07-12 현대자동차주식회사 Epoxy Functional Silane Deposition Effect on Untreated Aluminum Bond Strength

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020053175A (en) * 2000-12-27 2002-07-05 이계안 A method for boding aluminum adherend using secondary amine silane as a bonding promotor
KR20020053174A (en) * 2000-12-27 2002-07-05 이계안 A method for bonding aluminum adherend using primary amine silane as a bonding promotor
KR100391303B1 (en) * 2001-07-11 2003-07-12 현대자동차주식회사 Epoxy Functional Silane Deposition Effect on Untreated Aluminum Bond Strength

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