• 한국응용과학기술학회지
• /
• 제21권4호
• /
• pp.300-305
• /
• 2004

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, $60^{\circ}$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 $T_g$ values of cured films increased with dynamic $T_g$ values.

• 한국응용과학기술학회지
• /
• 제21권1호
• /
• pp.62-68
• /
• 2004

PU flame-retardant coatings (APHD) containing phosphorous were prepared by blending of hexamethylene diisocyanate-trimer, white pigment, dispersing agent, flowing agent, and previously prepared benzoic acid modified polyester (APTB) that contains phosphorous. Physical properties of the prepared APHD were examined. With the introduction of BZA (contained in APTB), the film viscosity and film hardness of APHD decreased. With the introduction of caprolactone group, the flexibility, impact resistance, accelerated weathering resistance of APTBs increased. Flame retardancy of the coatings was tested. In a vertical burning method, APHD shows 210${\sim}$313 seconds, and in a $45^{\circ}$ Meckel burner method, shows 1.3${\sim}$4.0$cm^2$ of char length, which indicates that the coatings are good flame-retardant coatings. Moreover, the amount of afterglow and flame retardancy of the coatings are decreased with increasing BZA content.

• 폴리머
• /
• 제30권3호
• /
• pp.238-246
• /
• 2006

본 연구에서는 인과 염소를 공유한 폴리우레탄(PU) 난연도료를 제조하여 인과 염소기의 시너지 효과에 의해 난연성을 더욱 향상시키는데 그 연구목적을 두었다. 합성은 tetramethylene bis (orthophosphate) 중간생성물(TMBO)과 neohexanediol trichlorobenfoate 중간생성물(TBA-adduct)인 이들 2종류 중간생성물과 1,4-butanediol 및 adipic acid의 4종류 단량체를 축합중합을 수행하여 4원공중합물(TTBA)을 얻은 다음, 합성된 TTBA류와 hexamethylene diisocyanate(HDI)-trimer인 경화제를 상온경화시켜 2성분계 PU 난연도료(TTBA-10C/ HDI-trimer=TTHD-10C, TTBA-20C/HDI-trimer=TTHD-20C, TTBA-30C/HDI-trimer=TTHD-30C)를 제조하였다. 제조된 TTHD류의 난연도료로서 도막시편을 제작하여 도막물성 측정용 시료로 사용하였다. 도막물성 측정 결과, 전반적으로 인 단독 함유보다 인과 염소를 공유한 쪽의 도막물성이 저하되는 경향을 나타내었다. 또한 난연성 시험으로서 수직법과 수평법의 연소성 시험법 및 $45^{\circ}$ Meckel burner법을 선정하여 난연성을 알아본 결과, 인 단독 함유보다 인과 염소를 공유한 TTHD류 쪽의 난연성이 더 좋게 나타난 것으로 보아 인과 염소에 의한 난연 시너지 효과가 일부 일어남을 인지할 수 있었다.

• 폴리머
• /
• 제34권6호
• /
• pp.574-578
• /
• 2010

본 연구에서는 고리화합물인 카프로락톤으로부터 2-hydroxyethyl acylate(2-HEA)를 개시제로 사용하여 caprolactone modified hydroxy acrylate(CHA)를 합성한 후, hexamethylene diisocyanate trimer(HDT)와 축중합을 통해 카프로락톤 변성 우레탄 아크릴레이트(UA) 올리고머를 합성하였다. 카프로락톤과 2-HEA의 몰비에 따른 CHA의 분자량은 수산가를 이용하여 계산되었으며, 계산된 분자량은 이론분자량과 거의 일치하였다. UA 올리고머의 점도는 2-HEA 대한 CHA의 함량이 증가할수록 감소하는 경향을 보였다. UA 올리고머와 반응형 희석제를 광개시제와 함께 광경화한 후, 형성된 경화필름의 내열성 및 내열 변색성을 측정하였다. 경화필름의 가교밀도가 증가할수록 내열성 및 내열변색성이 우수하였으나 가교밀도가 증가할수록 경도는 증가하지만, 신율은 상대적으로 감소하였다.

• 한국응용과학기술학회지
• /
• 제20권3호
• /
• pp.237-242
• /
• 2003

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, $60^{\circ}C$ 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 $T_g$ value. With the increase in $T_g$, log damp value was lowered and dynamic viscoelasic $T_g$ of a cured film was increased.

• 한국응용과학기술학회지
• /
• 제23권2호
• /
• pp.110-114
• /
• 2006

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 $60^{\circ}$ 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.

• 한국응용과학기술학회지
• /
• 제23권1호
• /
• pp.77-84
• /
• 2006

Modified polyesters (TTBA-10C, -20C, -30C) that contain phosphorus and chlorine were synthesized by the condensation polymerization of tetramethylene bis(orthophosphate), neohexanediol trichlorobenzoate, 1,4-butanediol and adipic acid, in which tetramethylene bis(orthophosphate) and neohexanediol trichlorobenzoate were prepared previously in our laboratory. In this study, two-component flame-retardant polyurethane coatings (TTBA-10C/HDI-trimer=TTHD-10C, TTBA-20C/ HDI-trimer= TTHD-20C, TTBA-30C/HDI-trimer= TTHD-30C) were obtained by curing at room temperature with the synthesized TTBAs and hexamethylene diisocyanate (HDI)-trimer as a curing agent. The obtained TTHDs were made into coating samples and used as test samples for various physical properties. The physical properties of the flame-retardant coatings containing chlorine and phosphorus groups were generally inferior to those containing only phosphorus group. Flame retardancy was tested by vertical and horizontal combustion method, and $45_{\circ}$ Meckel burner method. Since the retardancy of flame-retardant coatings containing chlorine and phosphorus groups was better than that containing only phosphorus group, it could be concluded that the retardancy by the synergism effect of chlorine and phosphorus groups exhibited.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2021년도 가을 학술논문 발표대회
• /
• pp.160-161
• /
• 2021

To prepare polyurethane coatings for top coatings of automobiles, acrylic resins containing 75% of solids were synthesized by a radical polymerization. The viscosity of the acrylic resins was increased with increasing OH values. Crosslinked acrylic-urethane clear coatings were obtained by curing reaction between the synthesized acrylic resins and hexamethylene diisocyanate(HDI) trimer(Desmodur N-3600). The physical properties from the following studies were carried out : viscosity(Zahn cup #2), adhesion, pensil hardness, and 60° specular gloss. Various properties of the acrylic-urethane clear coatings as top coatings of mobile coat were evaluated on the coating specimens. Adhesion property to a substrate, 60° specular gloss, and pencil hardness of prepared paint showed quite good properties.

• 한국응용과학기술학회지
• /
• 제38권2호
• /
• pp.476-487
• /
• 2021

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(T_g)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.

• 한국응용과학기술학회지
• /
• 제25권2호
• /
• pp.151-159
• /
• 2008

The flame-retardant coatings were prepared by blending the synthesized triphosphorus modified polyester 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. It was confirmed that no deterioration of physical properties of PU coatings was observed with the increasing phenylphosphonic acid (PPA) contents. Flame retardancy was tested by a $45^{\circ}$ Meckel burner method and LOI method. With the $45^{\circ}$ Meckel burner method, CATBTP-20C and CATBTP-30C that contain 20 wt% and 30 wt% of PPA, flame retarding component, respectively, showed the first grade flame retardancy with $2.8{\sim}3.9\;cm$ of char length ; and, with LOI method, they exhibited a good flame retardancy as a range of $30{\sim}32%$ of combustion values.