Ethyl acrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate 모노머와 도막물성 향상과 가교밀도를 극대화시켜줄 관능성 모노머인 acetoacetoxy ethyl methacrylate(AAEM) 혹은 caprolactone acrylate(CLA)를 각각 반응시 켜 4원공중합체인 고형분 70%의 아크릴수지(HSA류 : EA/EMA/2-HEMA/AAEMAAEM 혹은 HSC류 : EA/EMA/2-HElMA/CLA)를 합성하였다. AAEM 성분이 함유된 HSA류 및 CLA 성분이 함유된 HSC류의 아크릴수지의 ...
Ethyl acrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate 모노머와 도막물성 향상과 가교밀도를 극대화시켜줄 관능성 모노머인 acetoacetoxy ethyl methacrylate(AAEM) 혹은 caprolactone acrylate(CLA)를 각각 반응시 켜 4원공중합체인 고형분 70%의 아크릴수지(HSA류 : EA/EMA/2-HEMA/AAEMAAEM 혹은 HSC류 : EA/EMA/2-HElMA/CLA)를 합성하였다. AAEM 성분이 함유된 HSA류 및 CLA 성분이 함유된 HSC류의 아크릴수지의 점성도는 203∼550cps와 245∼515cps, 수평균분자량은 2590∼2850과 2670∼2840, 전환율은 82∼89%와 83∼91%였다. 4종의 개시제 benzoyl peroxide(BPO), α, α‘azobisisobutyronitrile(AIBN), tert-amylperoxy-2-ethyl hexanoate(APEH), di-tert-butyl peroxide(DTBP)로서 아크릴수지를 합성한 결과 DTBP>APEH >AIBN>BPO의 순서로 점성도가 증가되었으며, 본 연구의 적정 개시제는 APEH임을 확인하였다. 합성된 아크릴수지와 이소시아네이트인 hexamethylene isocyanate trimer를 블렌드하여 상온경화시켜 하이솔리드 도료를 제조한 후, 도막시편을 제작하여 도막물성을 측정한 결과 60˚경면광택도, 내충격성, 접착력 및 내열성은 양호하게, 연필경도와 건조시간은 다소 나쁘게 나타났다. 또한 내열성은 극히 우수한 결과를 보였는데, 이 물성의 향상은 아크릴 모노머 중 알킬기로 동일한 에틸기의 도입에 의한 에틸렌기의 규칙정연한 배열의 결정성을 아크릴수지 구조중에 많이 보유한 때문인 것으로 해석되었다. 한편 Rigid-body pendulum법에 의한 점탄성측정에서 Tg값이 증가할수록 경화가 빨리 진행됨을 확인하였다. 또한 Tg값이 상승함에 따라 점탄성비인 log damp값이 낮아지고, 경화된 도막의 동적 Tg값은 증가하는 경향을 나타내었다.
Ethyl acrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate 모노머와 도막물성 향상과 가교밀도를 극대화시켜줄 관능성 모노머인 acetoacetoxy ethyl methacrylate(AAEM) 혹은 caprolactone acrylate(CLA)를 각각 반응시 켜 4원공중합체인 고형분 70%의 아크릴수지(HSA류 : EA/EMA/2-HEMA/AAEMAAEM 혹은 HSC류 : EA/EMA/2-HElMA/CLA)를 합성하였다. AAEM 성분이 함유된 HSA류 및 CLA 성분이 함유된 HSC류의 아크릴수지의 점성도는 203∼550cps와 245∼515cps, 수평균분자량은 2590∼2850과 2670∼2840, 전환율은 82∼89%와 83∼91%였다. 4종의 개시제 benzoyl peroxide(BPO), α, α‘azobisisobutyronitrile(AIBN), tert-amylperoxy-2-ethyl hexanoate(APEH), di-tert-butyl peroxide(DTBP)로서 아크릴수지를 합성한 결과 DTBP>APEH >AIBN>BPO의 순서로 점성도가 증가되었으며, 본 연구의 적정 개시제는 APEH임을 확인하였다. 합성된 아크릴수지와 이소시아네이트인 hexamethylene isocyanate trimer를 블렌드하여 상온경화시켜 하이솔리드 도료를 제조한 후, 도막시편을 제작하여 도막물성을 측정한 결과 60˚경면광택도, 내충격성, 접착력 및 내열성은 양호하게, 연필경도와 건조시간은 다소 나쁘게 나타났다. 또한 내열성은 극히 우수한 결과를 보였는데, 이 물성의 향상은 아크릴 모노머 중 알킬기로 동일한 에틸기의 도입에 의한 에틸렌기의 규칙정연한 배열의 결정성을 아크릴수지 구조중에 많이 보유한 때문인 것으로 해석되었다. 한편 Rigid-body pendulum법에 의한 점탄성측정에서 Tg값이 증가할수록 경화가 빨리 진행됨을 확인하였다. 또한 Tg값이 상승함에 따라 점탄성비인 log damp값이 낮아지고, 경화된 도막의 동적 Tg값은 증가하는 경향을 나타내었다.
A copolymer(HSAs : EA/EMA/2-HEMA/AAEM or HSCs : EA/EMA/ 2-HEMA/CLA) which is an acrylic resin containing 70% solid content was synthesized by the reaction of monomers, including ethyl acrylate, ethyl methacrylate, and 2-hydroxyethyl methacrylate with a functional monomer, such as acetoacetoxyethyl m...
A copolymer(HSAs : EA/EMA/2-HEMA/AAEM or HSCs : EA/EMA/ 2-HEMA/CLA) which is an acrylic resin containing 70% solid content was synthesized by the reaction of monomers, including ethyl acrylate, ethyl methacrylate, and 2-hydroxyethyl methacrylate with a functional monomer, such as acetoacetoxyethyl methacrylate or caprolactone acrylate, which may give improvements in cross-linking density and physical properties of films. The physical properties of prepared acrylic resins, HSA(containing AAEM) and HSC(containing CLA), are as follows: viscosities, 203-550 cps and 245-515 cps; number average molecular weights, 2590-2850 and 2670-2840 and conversions, 82-89% and 83-91%, respectively. To prepare acrylic resins, four kinds of initiators including benzoyl peroxide(BPO), α , α ' -azobisisobutyronitrile(AIBN), tert-amylperoxy-2-ethyl hexanoate(APEH), and di-tert-butyl peroxide(DTBP) were used. The viscosity of the acrylic resins prepared with these initiators increased in the order of DTBP>APEH>AIBN>BPO. APEH proved to be a suitable initiator in this study. The high-solid coatings were prepared by blending the synthesized acrylic resin and hexamethylene diisocyanate-trimer and curing it at room temperature. The characterization of the films of the prepared coatings was performed. The impact resistance, 60˚ specular gloss, cross-hatch adhesion, and heat resistance of the films proved to be good, and the pencil hardness and drying time proved to be slightly poor. Especially, there was a remarkable improvement in the heat resistance. This improvement may stem from the regular arrangement of ethyl groups introduced into the acrylic resin. From a viscoelastic measurement using a rigid-body pendulum, curing was accelerated with the T_g value. With the increase in T_g, log damp value was lowered and dynamic viscoelastic T_g of a cured film was increased.
A copolymer(HSAs : EA/EMA/2-HEMA/AAEM or HSCs : EA/EMA/ 2-HEMA/CLA) which is an acrylic resin containing 70% solid content was synthesized by the reaction of monomers, including ethyl acrylate, ethyl methacrylate, and 2-hydroxyethyl methacrylate with a functional monomer, such as acetoacetoxyethyl methacrylate or caprolactone acrylate, which may give improvements in cross-linking density and physical properties of films. The physical properties of prepared acrylic resins, HSA(containing AAEM) and HSC(containing CLA), are as follows: viscosities, 203-550 cps and 245-515 cps; number average molecular weights, 2590-2850 and 2670-2840 and conversions, 82-89% and 83-91%, respectively. To prepare acrylic resins, four kinds of initiators including benzoyl peroxide(BPO), α , α ' -azobisisobutyronitrile(AIBN), tert-amylperoxy-2-ethyl hexanoate(APEH), and di-tert-butyl peroxide(DTBP) were used. The viscosity of the acrylic resins prepared with these initiators increased in the order of DTBP>APEH>AIBN>BPO. APEH proved to be a suitable initiator in this study. The high-solid coatings were prepared by blending the synthesized acrylic resin and hexamethylene diisocyanate-trimer and curing it at room temperature. The characterization of the films of the prepared coatings was performed. The impact resistance, 60˚ specular gloss, cross-hatch adhesion, and heat resistance of the films proved to be good, and the pencil hardness and drying time proved to be slightly poor. Especially, there was a remarkable improvement in the heat resistance. This improvement may stem from the regular arrangement of ethyl groups introduced into the acrylic resin. From a viscoelastic measurement using a rigid-body pendulum, curing was accelerated with the T_g value. With the increase in T_g, log damp value was lowered and dynamic viscoelastic T_g of a cured film was increased.
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