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분자량 조절제의 함량에 따른 수계 아크릴 점착부여제의 합성 및 점착 특성 연구
백란지,정부영,김세진,허필호,천정미,천제환 한국접착및계면학회 2022 접착 및 계면 Vol.23 No.3
In this study, water-based acrylic tackifier with different contents of 1-dodecanethiol(n-DM), a chain transfer agent(CTA), were synthesized to improve the performance and adhesive properties of water-based acrylic pressure sensitive adhesive(PSA). In order to investigate the change in physical properties according to the amount of water-based acrylic tackifier added, 10/20/30 phr of water-based acrylic tackifier was added to the water-borne acrylic emulsion to measure the physical properties. The molecular weight and glass transition temperature(Tg) of the synthesized water-based acrylic tackifier tended to decrease as the content of n-DM increased. When a water-based acrylic tackifier was added to the water-borne acrylic emulsion, the peel strength and heat-resistance were increased. Also, when the water-based acrylic tackifiers were added at 10 phr or 20 phr, the best value was shown.
아크릴 단량체 구조 및 조성에 따른 수계 점착부여제의 합성 및 물성 연구
김세진,백란지,정부영,허필호,천정미,천제환 한국접착및계면학회 2022 접착 및 계면 Vol.23 No.2
There has been a growing demand for water based-type PSA due to environmental regulations for solvent-type PSA. And accordingly, there is a growing expectation as well for tackifiers used to compensate for the problem of deterioration of physical properties. Therefore, In this study, water-based tackifiers were synthesized by changing the contents of hard and functional acrylic monomers CHMA, IBOA, and AA. And these were added to the pressure-sensitive adhesive at 10 phr and their physical properties were compared. Tackiness slightly decreased as CHMA increased and IBOA decreased. Since the intermolecular bonding force increased due to the increase in AA content, the lower the AA content showed better results. Peel strength increased as the tackifiers were added because the fluidity of the polymer chain increased. And higher AA content showed better results because more hydrogen bonds were formed. The holding power tended to decrease as CHMA increased because the content of IBOA relatively decreased which has a large influence on the holding power. And higher AA content showed better results.
Study on Biodegradable Resin Using Itaconic Acid for Coating Paper
심재학,백란지,김세진,천정미,천제환,황지원 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
전세계적으로 환경보호를 위한 일회용 플라스틱 컵 퇴출 캠페인과 더불어 일회용 종이컵의 환경문제와 자원낭비의 심각성에 대한 인식이 증가된다. 또한, 현재 전세계적인 감염병 증가로 다회용 컵 사용이 제한되기도 하므로 일회용 컵을 기존의 기술접근을 뛰어 넘는 신기술 개념이 도입된 리사이클링 및 생분해가 가능한 종이 코팅 기술이 필요하다. 친환경 기술요구에 대응이 가능하도록 자연유래 지방산과 같은 생분해성 물질을 주쇄에 도입하여 해리성을 높여 재활용성을 용이하게 하고 산화제로 사용하여 생분해성을 가진 코팅용기의 포장재를 만들고자 한다. 특히, Itaconic acid 와 같은 이중결합을 가지고 있어 가교 결합이 가능하도록 분자설계하여 내수성, 내유성 등의 요구에 대응하고자 한다. 본 연구에서는 위의 기술적 요구 사항을 충족시키기 위해 식물성 지방산과 디올의 탈수 축합 반응에 의한 에스테르 주쇄를 갖는 생분해성 수지를 연구하고자 한다. 또한 이중 결합이있는 Itaconic acid 와 생분해성이 높은 다관능성 모노머를 선별하여 공중합을 통해 알칼리 해리성과 내열성을 모두 만족하는 생분해성 수지를 연구하였다.
광경화형 바이오매스계 우레탄 아크릴레이트 올리고머의 합성 및 물성 연구
김세진,백란지,구병진,최정인,천정미,천제환 한국접착및계면학회 2023 접착 및 계면 Vol.24 No.1
Generally, solvent-type coatings generate a large amount of volatile organic chemicals(VOC), which are carcinogenic substances, in the manufacturing process, and their use is regulated due to environmental problems. There is also the problem of resource depletion due to limited fossil fuels. Therefore, in this study, UV-curable urethane acrylate oligomers were synthesized with different contents of isosorbide, which is a biomass material, and proceeded to evaluate the physical properties of coatings. As the isosorbide contents increased, the viscosity, glass transition temperature, tensile strength, stain resistance, and pencil hardness increased, but elongation and flexibility decreased, and BOI-3 showed the best adhesion. The isosorbide content of the oligomer fixed at 20%, UV-curable urethane acrylate oligomer was synthesized according to the content ratio of polycaprolactone diol(PCL) and Ecoprol H1000(Ecoprol). As the PCL/Ecoprol content ratio increased, the glass transition temperature, elongation, and flexibility increased, but the tensile strength and pencil hardness decreased. It was confirmed that the adhesion and stain resistance increased by improving the surface bonding strength of PCL. All films of oligomers synthesized were transparent without discoloration.