고형분 70% 아크릴수지를 합성하기 위해 n-butyl methacrylate(BMA), methyl methacrylate(MMA), 2-hydroxyethyl methacrylate(2-HEMA) 및 acetoacetoxyethyl acrylate(AAEA)와 caprolactone acrylate(CLA)를 사용하여 공중합체의 유리전이온도(Tg)를 50 ℃로 조정하여 합성하였으며, 합성한 아크릴수지의 점도와 분자량은 수산기가(OH values)의 증가에 따라 증가되었다. 높은 고형분의 아크릴수지 합성에 적합한 반응개시제는 di-tert-amyl peroxide 이었으며, 최적의 합성조건은 반응 개시제 5 wt%, 연쇄이동제 4 wt%, 반응온도 140 ℃에서 적하시간은 4시간이었다. 합성수지의 구조는 FT-IR과 1H-NMR spectroscopy로 확인하였고, 수평균 분자량은 1900~2600, 분자량 분포도 1.4~2.1을 얻었다. 합성한 아크릴수지와 무황변성 폴리이소시아네이트인 hexamethylene diisocyanate trimer(Desmodur N-3300)의 NCO/OH 당량비를 1.2/1.0으로 조절하여 아크릴-우레탄 투명도료를 제조하였다. 도료의 물리적 특성으로 점도, 부착성, 건조시간, 가사시간, 연필경도 및 광택을 비교 검토한 결과 부착성, 건조시간, 가사시간, 연필경도 및 광택이 양호한 결과를 나타내었고, 특히 CLA를 10 % 도입한 도료는 부착성이 우수하고 낮은 점도와 높은 경도를 나타내었다.

본 연구에서는 ethyl acrylate monomer(EAM)을 사용한 수용성 아크릴 수지를 합성한 후 monoammonium phophate를 수용액 상태로 녹인 뒤 이를 아크릴 수지에 함양을 달리한 시료를 준비하 여 각각의 필름 상태 및 피혁 외부에 코팅하여 기계적 물성측정 및 열안정성 물성 측정 실시하여 각각 의 시료를 비교 검토 하였다. DSC를 이용한 열안정성 측정 결과 monoammonium phosphate 함량이 높은 시료(WAC-APS3) 의 Tm 값이 410℃ 로 가장 높은 열안정성을 확인할 수 있었다. 내용제성 측정 결과 아크릴 수지 및 브랜딩 된 수지 모두 높은 내용제성을 확인 할 수 있었다. 내마모성 측정결과는 monoammonium phosphate 함량이 높은 수지가 우수한 물성(68.729 mg.loss)을 보였으나, 인장 강도, 연신율 측정치에서는 monoammonium phosphate 함량이 높아질수록 물성이 저하되어 아크릴 수지의 인장력인 1.505 kgf/㎟ 보다 낮은 1.275 kgf/㎟ 이 측정되었으며, 연신율의 경우 수용성 아크릴 수지 단 독 시료의 연신율인 425% 보다 낮은 384% 가 측정되었다.

본 연구에서는 수용성 아크릴을 합성한 다음 수성 카제인 수지를 합성하여 기합성 완성된 아크릴 수지에 카제인 수지의 적하량을 점차 증가시켜 변화하는 물성을 피혁(Lamb leather)에 표면 코팅하여 물성을 측정 분석하였다. 내용제성 측정 결과 높은 내용제성 물성을 지닌 아크릴 수지와 카제인 수지의 함량이 물성 변화에 끼치지 않았으며 모두 높은 물성치를 나타내었다. 인장 강도 측정치에서는 아크릴 단독 코팅의 측정치가 1.399kgf/mm2로 가장 낮은 수치를 나타내었으며, 카제인 수지의 합량이 제일 높은 WAC-3가 가장 높은 인장력 1.426kgf/mm2을 나타내었다. 또한 내마모도 측정에서는 WAC-3가 제일 높은 69.774 mg.loss로 우수한 물성변화를 나타내었고, 연실률의 경우 아크릴 단독 코팅인 WAR이 820 %로 가장 높은 수치를 나타내었다.

본 연구에서는 도심지 열섬현상을 완화 시킬 수 있는 아크릴 수지와 차열안료를 혼합한 차열성 포장을 개발하였다. 태양 복사열에 의한 포장체의 온도상승을 모사한 실내 시험으로부터 60℃의 포장 온도에서 차열성 포장이 12℃ 이상의 온도 저감 효과를 나타냈다. 이러한 온도 감소 효과는 차열안료의 배합비가 증가함에 따라 증가하였고, 반면에 점도의 증가로 인하여 작업성은 떨어졌다. 이러한 결과로부터 아크릴 수지 대비 차열안료의 최적혼합비율을 15%로 결정하였다. 차열성 포장의 칸타브로 손실률은 일반 배수성 포장의 손실률 1/4 수준으로 골재 비산 저항성이 우수하게 나타났다. 휠트랙킹 시험결과 차열성 포장의 동적안정도가 일반 배수성 포장에 비해 두 배 증가하였다. 차열성 포장재의 높은 부착력으로 인하여 탈리에 의한 손상 가능성은 낮은 것으로 나타났다. 시험 시공 구간에서의 소음도 측정 시험 결과 일반 배수성 포장에 비하여 평균 3.7dB의 소음저감 효과가 있었고, 미끄럼 저항치는 일반 배수성 포장에 비해서 평균 30% 정도 높아 우수한 미끄럼 저항성을 가지는 것으로 판단된다. 투수 시험 결과 차열성 포장의 투수성은 일반 배수성 포장보다 다소 작았으나 국내 배수성 포장 기준을 만족하는 것으로 나타났다.

In this study we experimented that how polyurethane effect to acrylic-polyurethane resin in Full-Grain leather coatings. First of all, we consummated waterborne acrylic emulsion and waterborne polyurethane resin, Than we prepared F.G leathers which were coated by acrylic resin and acrylic-polyurethane resins. According to measured data for solvent resistance, acrylic resin and acrylic-polyurethane resins had good property. Sample a(WAC) had most low strength(2.10kgf/mm2) and sample d(WAC 93 : WPU 7) had most high strength(3.41kgf/mm2). Also we knew that most good property of abrasion is d(47.4 mg). In elongation case, a(WAC) had most good result(645 %) in this experiment.

In this study we experimented that how chain extension influences to waterborne urethane-acrylic hybrid resin for leather garment coatings. We knew that polyurethane-acrylic hybrid resins had 5 grades of solvent resistance. Tensile strength measured in the polyurethane-acrylic resin(EDA 5.37 g, 1.928 kgf/mm2) had the most strong strength. Also polyurethane-acylic hybrid resin(EDA 5.37 g. 30.2 mg. loss) had better result than other hybrid resins. EDA contents higher, we obtained low elongation and low flexibility. In this result, chain extension of waterborne polyurethane-acrylic hybrid resin showed the effect in leather coating with ratio of EDA.

For the synthesis of water soluble acrylic modified epoxyester resin, fatty acid/epoxy ratio of 50/50 was used, and introduced maleic anhydride. Ratio of styrene/acrylic acid of acrylic monomers was fixed 85/15 and ratio of epoxyester/acrylic monomer was controlled 80/20, 75/25, 70/30, 65/35, and degree of neutralization were changed 65%, 80%, to 100%. As a result, 40% solids acrylic modified epoxyester resins were synthesized. Resins were evaluated water soluble stability, drying time, water resistant, storage stability and physical properties. And the white paints were prepared, and were evaluated viscosity, drying time, water resistance, adhesion, sagging, spray workability, gloss, salt spray resistance, skinning, whiteness and flash rust. As a result, the degree of neutralization of 100% and the ratio of epoxyester/acrylic monomer of 75/25 showed the best properties.

본 연구는 배수성 아스팔트 포장의 표면을 아크릴 수지로 코팅 처리할 경우 내구성 측면 및 기능적 측면에서 어떠한 효과가 있는가를 실내시험을 통해 평가하는 기초적인 연구이다. 포장의 내구성 측면에서는 칸타브로 및 휠트래킹, 수분손상 간접 인장 피로 시험 등을 실시하였다. 시험결과 시편을 수지로 코팅을 한 경우 칸타브로 손실률이 3배 정도 감소되었고 균열에 대한 저항성도 대폭 향상되었으나 수분손상 및 소성변형의 저항성은 큰 차이가 없는 것으로 나타났다. 기능적인 측면에서는 코팅 전 후의 투수계수 및 공극률 BPT(British Pendulum Tester)를 사용한 미끄럼 저항성의 변화를 측정하였다. 시험결과 공극률 및 투수계수는 약간 저하되나 기능상의 문제는 없을 것으로 판단되며, 미끄럼 저항성은 규사를 살포하지 않을 경우 미끄럼 저항성이 감소되나 규사를 살포할 경우 코팅 전 수준 이상의 미끄럼 저항성을 확보하는 것으로 나타났다.

In order to synthesize high-solid coatings, acrylic resins (HSAs) containing 90% solid content were first synthesized, then the synthesized HSAs were cured with a curing agent, isocyanate, at room temperature to obtain high-solid coatings. In the HSAs synthesis, conversion was in a range of 82~87%, and viscosities and number-averaged molecular weight (Mn) of the HSAs were in a range of 4380~8010 cP and 1540~1660, respectively. From the correlation between Tg value, viscosity and Mn, it was found that, with increasing Tg value, viscosity increases rapidly and molecular weight increases slowly. From the visco-elasity measured by the pendulum method, it was found that the curing time decreased with increasing Tg values. From the tests of physical properties of the coatings' film, 60˚ specular gloss, impact resistance and heat resistance were proved to be good and pencil hardness, drying time and pot-life were proved to be poor.

Three different weather-resistant coatings were fabricated with the various weight ratios of a mill-base silicone/acrylic resin to let-down silicone /acrylic resin at 2:8, 3:7, and 4:6 respectively. The prepared coatings were tested to investigate the effect of composition of weather-resistant coatings on the physical properties. The thermal stability, salt spray exposure, and weather-resistance were improved with the increased silicone content. It was concluded that the optimum retio of mill-base silicone/acrylic resin to let-down silicone/acrylic resin would be 2:8 and the coating with 30 wt% of silicone content would have high weather-resistance.

In order to prepare high-solid coatings, acrylic resins, HSCs [poly (EA/EMA/2-HEMA/CLA)] that contain 90% solid, were synthesized by copolymerization of ethyl acrylate (EA), ethyl methacrylate (EMA), 2-hydroxyethyl methacrylate (2-HEMA) and caprolactone acrylate (CLA). The high-solid coatings named as CHSCs (HSCs/HDI-trimer) were prepared by the curing reaction between the acrylic resins containing 90% solid contents and the isocyanates (HDI-trimer) curing agent room temperature. The curing behavior and various properties were examined on the film coated with the both high-solid coatings. The glass transition temperatures (Tg) of CHSCs increased proportionally with increasing the predicted Tg value by Fox equation, and had nothing to do with the solid contents. The prepared film showed good properties for 60˚ specular gloss, impact resistance, cross-hatch adhesion and heat resistance, and bad properties for pencil hardness, drying time, and pot-life. Among the film properties, the heat resistance was very excellent and could be explained by the introduction of functional monomers of CLA.

To prepare weather-resistant silicone/acrylic resin coatings for an architectural purpose, tetrapolymers were synthesized by a radical polymerization. 3-Methacryloxypropyltrimethoxysilane (MPTS) as a silicone monomer and n-butyl acrylate, methyl methacrylate, and n-butyl methacrylate as acrylic monomers were used. The compositions of monomers were adjusted to fix the glass transition temperature of acrylic polymer for 20℃. The composition of MPTS in the synthesized polymer were varied from 10 wt% to 30 wt%. On the basis of synthesized resin amber paints were prepared and their physical properties and effects for weatherability were examined. The presence of MPTS in silicone/acrylic resins generally resulted in low molecular weight and broad molecular weight distribution, and also lowered the viscosity of the copolymers. The coated films prepared from these resins showed good and balanced properties in general. Adhesion to the substrate was outstanding in particular. Weatherability tests were carried out in three different types such as outdoor exposure, QUV, and SWO. The test results showed that the silicone/acrylic resins containing 30 wt% of MPTS had weather-resistant properties.

In order to prepare high-solid coatings, first acrylic resins (HSAs) which contain 80% solid were synthesized, and then the prepared resins were cured with isocyanate at room temperature. In the synthesis of HSAs, viscosity, number average molecular weight (Mn) and conversion were 1372~2700 cps, 1520~1650 and 83~87%, respectively. Among the four kinds of initiators used, tert-amylperoxy-2-ethyl hexanoate was the most proper one in the synthesis of HSAs. With increasing Tg values, viscosity increased rapidly and molecular weight increased slowly. As a result of the examination of coated films, it was found that 60˚ specular gloss, impact resistance, heat resistance and cross-hatch adhesion were good, and pencil hardness, drying time and pot life were poor.

The high-solid coatings were prepared by blending the synthesized acrylic resin in the previous paper, and hexamethylene diisocyanate-trimer and curing it at room temperature. The characterization of the films of the prepared coatings was performed. The 60˚ specular gloss, impact resistance, cross-hatch adhesion, and heat resistance of the films proved to be good, and the pencil hardness, drying time, and pot-life proved to be slightly poor. From a viscoelastic measurement using a rigid-body pendulum, curing was accelerated with the Tg value.

Acrylic resins (HSCs : EA/EMA/2-HEMA/CLA) which contain 80% solid content were synthesized by the copolymerization of monomers (ethyl acrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate) and functional monomer (caprolactone acrylate : CLA) which improves the crosslinking density and physical properties of films. The physical properties of the prepared acrylic resins (HSCs) containing CLA, are as follows: viscosity 1440~2630 cps ; Mn 1590~1660 ; and conversions, 81~86%, respectively. From the correlation of Tg values, viscosities, and Mn of the HSCs, it was found thst viscosity and Mn increased with Tg value.

Copolymers (HSA-98-20, HSA-98-0, HSA-98+20) which are acrylic resin containing 80% solid content were synthesized by the reaction of monomers, including methyl methacrylate, n-butyl acrylate, and 2-hydroxyethyl acrylate with a functional monomer, such as acetoacetoxyethyl methacrylate (AAEM), which may improve in cross-linking density and physical properties of films. The physical properties of prepared acrylic resins, containing AAEM, are as follows : viscosity, 1420~5760cps ; number average molecular weight, 2080~2300 ; polydispersity index, 2.07~2.19 ; conversions, 88~93%, respectively. To prepare acryl resins, four kinds of initiators including α,α'-azobisisobutyronitirile (AIBN), di-tert-butyl peroxide (DTBP), t-amylperoxy-2-ethyl hexanoate (APEH), benzoyl peroxide (BPO) were used. The viscosity of the acrylic resins prepared with these initiators was increased in the order of DTBP〉APEH〉AIBN〉BPO. APEH was proved as a suitable initiator in this study. Shear rates of acrylic resins were constant in respect to viscosity. From these results, it would appear that the resins have Newtonian flow characteristics and good workability.

High-solid coatings were prepared by blending of previosly synthesized acrylic resins and hexamethylene diisocyanate-trimer and curing it at room temperature. The characterization of the films of the prepared coatings was performed. The impact resistance, cross-hatch adhesion, 60˚specular gloss, 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. As a result of Rigid-body pendulum visco-elasticity measurement, dynamic Tg values of cured films increased with dynamic Tg values.

Acrylic resins (HSCs : EA/EMA/2-HEMA/CLA) which contain 70% solid content were synthesized by the copolymerization of monomers (2-hydroxyethyl methacrylate, ethyl acrylate, and ethyl methacrylate) and functional monomer (caprolactone acrylate : CLA) which improves the crosslinking density and physical properties of films. The physical properties of the prepared acrylic resins (HSCs) containing CLA, are as follows : viscosity 245~515 cps ; Mn 2670~2840 ; and conversions, 83~91%, respectively. From the correlation of Tg values, viscosities, and Mn of the HSCs, it was found that viscosity and Mn increased with Tg value.

The high-solid coatings were prepared by blending the synthesized acrylic resin in the previous paper 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 adhension, 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 Tg value. With the increase in Tg, log damp value was lowered and dynamic viscoelasic Tg of a cured film was increased.