• Polymer(Korea)
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• v.26 no.5
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• pp.615-622
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• 2002

Weather-resistant coatings were prepared by mixing a synthesized mill-base and let-down silicone/acrylic resin in weight ratios of 4 : 6, 3 : 7, and 2 : 8. The weatherability of the prepared coatings was tested. The thermal stability, general physical properties, and weatherability of the films of the coatings were improved with silicone content. Among the three mixing ratios mentioned, the ratio of 2 : 8 was the most suitable for the preparation of weather-resistant Coatings. The coatings containing 30 wt% of silicone proved to be a high weather-resistant coating.

• Journal of Adhesion and Interface
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• v.2 no.2
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• pp.20-27
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• 2001

Recently polycarbonate material has been utilized as windows in aircraft, buildings, and optical lens. However, while polycarbonate has excellent optical transparency, impact strength and many beneficial mechanical properties, it possesses poor abrasion resistance and weatherability. Then, there is a need for developing optically clear, anti-abrasive and weather resistant hard coating agents for polycarbonate. In this study, N-triethoxy silyl propyl quinine urethane(TESPQU) was synthesized with quinine and 3-isocyanato propyl triethoxy silane(3-IPTES). In order to introduce optically active silane in the main siloxane network, TESPQU was co-hydrolysed and co-condensed with methyl triethoxy silane(MTES) under acidic conditions. Polycarbonate sheets were coated with silica coating agents by the sol-gel method, and their abrasion resistance, ability of UV absorption and weatherability were evaluated. Coating agents containing hydroxybenzophenone as a UV absorber were also prepared to compare weatherability with TESPQU containing coating agent. TESPQU containing coating agent had good weatherability in accelerated QUV test.

• Proceedings of the Korean Fiber Society Conference
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• 2003.10a
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• pp.106-106
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• 2003

6 woven geotextiles for reinforcement were used to examine the effects of weatherability and reduction factor on the tensile properties. Decrease of tensile strength as the tool of these evaluations of woven geotextile was examined.

• International Journal of Highway Engineering
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• v.11 no.2
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• pp.133-139
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• 2009

Joints on concrete road prevent failure and crack securing the moderate space when concrete slab expands and contracts as a function of varying temperature throughout all seasons. Filling joint sealants in joints can prevent the interruption of slab movement and failure due to the infiltration of alien substances, and also can prevent crack caused by freezing and thawing and Dowel bar corrosion resulted from water - rainfall and snowfall infiltration through the inside the pavement. They lead to the improvement of the commonality of road. This paper evaluates physical strength, weatherability and deicer resistance of a two-year aged sample from joint on concrete road and its virgin sample. It was found that there are significant differences in aspects of weatherability and adhesive force between the tested sample and silicon materials.

• Elastomers and Composites
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• v.48 no.2
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• pp.167-171
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• 2013

Weatherability was examined according to aluminum particle size and its orientation used in PCM(Paint Coated Metal). Substrate delamination was checked by different UV transmission rate with QUV$^{(R)}$ (Q-LAB) equipment that can make accelerated UV irradiation. Film was prepared using three different types of conflake aluminum pastes under a PCM coating process and clearcoat was sprayed. UV transmission test results showed low transmission rate when EKART #790 having the smallest particle size and horizontal orientation was used. From the gloss retention results, gloss retention was highest in EKART #790 and followed by #770, #750.

• Journal of the Korean Applied Science and Technology
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• v.25 no.1
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• pp.1-14
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• 2008

To prepare weather-resistant modified silane acrylic resin coatings for an architectural purpose, tetrapolymers were synthesized by 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 composition of monomers was adjusted to fix the glass transition temperature of acrylic polymer for $20^{\circ}C$. 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 on weatherability were examined. The presence of MPTS in modified silane 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 modified silane acrylic resins containing 30 wt% of MPTS had superior weathering properties.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2002.05a
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• pp.151-154
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• 2002

The durability of two kinds of CFRP plates, carbon/UP and carbon/V, was studied under severe environmental conditions. Immersion into the chemical solutions and accelerated weathering were executed on the CFRP plates and the weight change under each condition was measured. After those treatments, the plates were tested by tensile testing machine to measure the mechanical properties and observed by SEM to find the damage behaviour of the surface. Comparing the virgin plates and the chemically exposed plates, both plates show severe deterioration of the mechanical properties. But, the plates subjected to alkali solution show much larger reduction than those of acidic solution and carbon/V has better chemical resistance than carbon/UP. The material properties of CFRP plate exposed to the weathering were deteriorated linearly proportional to the exposure time.

• Journal of the Korean Applied Science and Technology
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• v.24 no.3
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• pp.253-263
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• 2007

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.

• Applied Chemistry for Engineering
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• v.5 no.4
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• pp.722-730
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• 1994

The effects of antioxidant and carbon black on weatherability of crosslinked polythylene(XLPE) for electrical insulation were investigated. 16 compositions were prepared in other to determine the weathering resistance. Samples were exposed in xenon-arc lamp Weather-Ometer for 500, 1000, 1500, 2000 hours respectively. Tensile strength, elongation at break, dielectric strength and tan ${\delta}$ were measured to evaluate the weatherability of XLPE. The results indicated that the effect of carbon black was more prominent than antioxidant and synergistic effect, was observed when two additives were mixed.

• Korean Chemical Engineering Research
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• v.55 no.5
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• pp.579-585
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• 2017

Acrylic resins containing tertiary amine were synthesized by a radical polymerization of monomers including n-butyl acrylate (BA), methyl methacrylate (MMA), n-butyl methacrylate (BMA) and dimethylaminoethyl methacrylate (DMAEMA), and diethylaminoethyl methacrylate (DEAEMA) containing tertiary amine. Synthesized acrylic resins were applied to develope coatings of acrylic resins containing tertiary amine. And ${\gamma}$-glycidoxypropyl trimethoxysilane (GPTMS) or ${\gamma}$-glycidoxypropyl triethoxysilane (GPTES) was used as hardener. Developed coatings were white colored ones to use titanium dioxide and were hardened with hardener for measuring their physical properties. Measured physical properties were basic properties, adhesivity and weatherability. As a result, developed acrylic resins coatings containing tertiary amine showed excellent adhesivity on various substrates and also showed the same result on weatherability on dry weather condition.