• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2005.11a
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• pp.413-416
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• 2005

The study has been performed on the improvement of bonding process and bond strength of HTPB propellant and liner using a polymeric curative. In case of liner using polymeric curative prepared from reaction of HTPB and TDI, migration of curative was decreased at bond interface. So EPDM insulation sanding and Desmodur RE coating process could be omitted in motor case preparation and bond strengths between the HTPB propellant and liner were increased. Also deterioration phenomena of bond strength could not be observed in accelerated aging test.

• Journal of the Korean Society of Propulsion Engineers
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• v.10 no.2
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• pp.110-114
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• 2006

The study has been performed on the improvement of bonding process and bond strength of HTPB propellant and liner using a polymeric curative. In case of liner using polymeric curative prepared from reaction of HTPB and TDI, migration of curative was decreased at bond interface. So EPDM insulation sanding and Desmodur RE coating process could be omitted in motor case preparation and bond strengths between the HTPB propellant and liner were increased. Also deterioration phenomena of bond strength could not be observed in accelerated aging test.

• Journal of Adhesion and Interface
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• v.19 no.1
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• pp.5-12
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• 2018

The purpose of this study is to evaluate the adhesive properties of polyurethane mixed aqueous dispersions by omitting the primer, dealing with the preparation of skins for synthetic leather with excellent adhesion by omitting the pre-treatment process. The two-component mixed polyurethane water dispersion was prepared by synthesizing an ester-based polyurethane resin (PU-T) and a carbonate-based polyurethane resin (PU-C) to obtain the final resin. As a result of measuring the peel strength of the adhesive specimens omitting the pre-treatment agent, it was confirmed that the state adhesive strength (ethylene vinyl acetate (middle): $4.2kg_f/cm$ and rubber (outsole): $4.4kg_f/cm$) there was. This makes it possible to omit the pre-treatment process which has been indispensably used in the shoe manufacturing process, thereby reducing the process time and reducing the amount of volatile organic compounds (VOCs) generated in the pre-treatment product, resulting in environmentally advantageous.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.03a
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• pp.23-23
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• 2003

PCB 회로기판용 전해동박은 드럼형태의 음극 표면에 연속적으로 전기 도금한 후 벗겨내어 권취하는 원박 제조공정과 접착성, 내열성, 내화학성, 방청성을 부여하기 위한 후처리 공정으로 나눈다. 이 후처리 공정 중 동박과 수지와의 접착성을 부여하기 위해 일반적으로 전기도금을 통해 조화(Nodule)처리를 실시하는데, 최근 LCD, PDP 등의 평판 디스플레이 장치의 구동칩이 실장되는 TCP용 동박의 경우 2$\mu\textrm{m}$이하의 낮은 조도(Rz)와 함께 높은 접착강도(Peel Strength)가 요구되고 있다. 그러나, Reel to Reel 형태의 연속도금공정으로 진행되는 조화처리에 있어 일반 비이커 실험결과는 실제 양산공정과의 재현성에 있어서 상당한 제한성이 노출된 바 있다. 이에 본 연구에서는 Reel to Reel 형태의 연속도금공정을 모사 할 수 있는 실험장치를 설계, 제작하여 동박표면의 노듈형성에 있어 주요인자를 정량적으로 분석하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.117-118
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• 2011

• Journal of Adhesion and Interface
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• v.19 no.2
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• pp.55-59
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• 2018

In this study, to overcome a complicated shoe adhesion process such as buffing, pre-treatment by primer in the rubber component of the shoe, we studied adhesion mechanical properties with rubber compound added water-soluble salt for the purpose of improving the adhesion between midsole and outsole. Acid salts, basic salt and neutral salts were evaluated, rubber containing basic salts showed excellent adhesion to water-based adhesion. Since the basic salt is present as the hydroxy salt, the surface of rubber is hydrophilized. The results are confirmed by contact angle and IR spectroscopy measurement. In addition, in the case of rubber compound added basic salts, NBS abrasion resistance and hardness were increased by increasing crosslink density, but crosslink time was delayed.

• Journal of Adhesion and Interface
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• v.25 no.1
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• pp.152-156
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• 2024

We conducted research on a two-component epoxy adhesive material based on acid graft polyolefin using maleic anhydride to address the lack of formability due to epoxy adhesives' hard segments. To understand the graft efficiency according to reaction conditions, we conducted studies based on polyolefin molecular weight, initiator half-life, and initiator concentration for each process. The maleic anhydride grafted polyolefin produced was used as an adhesive material for aluminum and CPP film lamination after mixing with epoxy hardener. The graft efficiency in the solution process was approximately 30% superior to that in the melt process, and an increase in graft ratio confirmed an increase in peel strength.

• International Journal of Highway Engineering
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• v.10 no.3
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• pp.239-246
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• 2008

In this study, the influence of reaction temperatures, mixing time and flexible modifier for crumb rubber modified asphalt(CRMA) as processing conditions were investigated. The temperature susceptibility and adhesion properties of neat and modified asphalts at low temperature measured using the penetration and tensile adhesion test. It was found that processing temperatures and flexible modifier were important factors for tensile adhesion strength and toughness energy at low temperature. The CRMA in the higher processing temperature and flexible modifier exhibited improved tensile adhesion properties which indicated the flexible structure of neat and modified asphalt binder. In general, the improvements of the physical properties in the CRMAs were due to the improvements of miscibility between CR and asphalt binder. It was found that the adhesion properties of the flexible agent modified CRMA were higher than CRMA were related to the flexible agent tend to penetrate into CR particles and asphalt binder.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.37 no.8
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• pp.751-758
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• 2009

Failure strengths of composite single-lap adhesive joints were investigated with various parameters such as manufacturing method, overlap length and adherend thickness. A total of 335 single-lap joint specimens were tested under tension. Specimens were fabricated with 4 different manufacturing processes; cocuring without and with adhesive, secondary bonding and co-bonding. Each manufacturing process has 5 different overlap lengths and 4 different thicknesses, respectively. As expected, failure strength is higher in thicker adherend joints and lower in larger overlap length specimens. Interesting result is that the secondary bonded joints show the higher strength than the cobonded and cocured joints with adhesive, and give close or even higher strength compared with non-adhesive cocured case.

• Journal of Adhesion and Interface
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• v.18 no.2
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• pp.53-58
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• 2017

In this study, to overcome a complicated shoe adhesion process such as buffing, pre-treatment by primer in the rubber component of the shoe, we studied adhesion and mechanical properties with rubber compound added $MgCl_2$. We determined adhesion properties of $MgCl_2$ content. Especially, the rubber containing $MgCl_2$ exhibited good adhesion properties to water-based adhesion. Since $MgCl_2$ is a water-soluble salt, it was judged that this phenomenon occurred. The results are confirmed by contact angle and surface morphology measurement. In addition, in the case of rubber compound added $MgCl_2$, the crosslinking efficiency was increased and the NBS resistance was increased.