Page 44 - Handbook of Surface Improvement and Modification

2.4 Properties and Application data 39

The anti-scattering film comprises a transparent film and a hard coating layer formed
71
on the top of the transparent film. The hard coating layer comprises inorganic nanoparti-
71
cles, a UV-curable acrylate resin, a photoinitiator, and azo-based dye.
Optically clear abrasion (or scratch) and chemical-resistant coating for use on plastic
surfaces includes silane which has non-hydrolyzable radical containing an epoxy group
(3-glycidoxypropyltrimethoxysilane), aluminum alkoxide (aluminum sec-butoxide),
hydrolyzable silicone compound (tetraethylorthosilicate), acid (nitric acid), and water. 72
The coating can also be used on metallic substrates to improve their hardness and anti-cor-
72
rosion (or barrier) properties.
Functionalized coatings preferentially coated on the tin-side of float glass used in
solar and other applications include silane-based precursors that are used to form coatings
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through a sol-gel process including hydrolyzed alkoxysilane-based sols. The coatings
are characterized by anti-reflective, abrasion resistant, and anti-soiling properties and the
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tunability of those properties with respect to different applications.
1
The coating composition comprises a mixture of silanes having the formula R n-Si-
1
2
(OR ) , wherein R is selected from substituted and unsubstituted alkyl, substituted and
4-n
unsubstituted cycloalkyl, substituted and unsubstituted heterocycloalkyl, substituted and
unsubstituted aryl, substituted and unsubstituted heteroaryl, substituted and unsubstituted
alkylthio, substituted and unsubstituted alkylamino, substituted and unsubstituted perfluo-
2
roalkyl, and substituted and unsubstituted alkyl halide, having 1-15 carbon atoms, R is
C -C alkyl, n=0-4, and n is, on average, not greater than 1, and not less than 0.54; a sec-
1
3
ond component containing an aqueous dispersion of functionalized nano-particles having
the functional groups which are capable of condensing with hydroxyl groups; and an inor-
74
ganic and/or organic acid catalyst. The composition forms a coating with high hardness,
high scratch resistance, good thermal impact resistance, inertia to acid and stains, UV
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transparency, and excellent adhesion to substrates such as metal and glass.
Hybrid latex emulsion can be used in coating compositions having good blush resis-
75
tance, abrasion resistance, blister resistance, hardness, and scratch resistance. The coat-
ing composition can be used to coat substrates such as cans and packaging materials for
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the storage of food and beverages. Hybrid latex emulsion is prepared by mixing an eth-
ylenically unsaturated monomer component and a stabilizer in a carrier to form a mono-
mer emulsion, and reacting the monomer emulsion with an initiator to form the hybrid
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latex emulsion. The ethylenically unsaturated monomer component may include an
organosilane compound, which may include a reactive organic group and a hydrolyzable
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inorganic alkoxysilane.
The polyrotaxane (caprolactone-grafted polyrotaxane polymer A1000, Advanced
Soft Material Inc.) compound is used in a photocurable coating composition having excel-
lent scratch resistance, chemical resistance, abrasion resistance as well as excellent self-
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healing capability.
REFERENCES
1 Browning, R; Sue, H-J; Minkwitz, R; Charoensirisomboon, P, Polym. Eng. Sci., 51, 2282-94, 2011.
2 Xiao, S; Hossain, MM; Liu, P; Wang, H; Hu, F; Sue, H-J, Mater. Design, 132, 419-29, 2017.
3 Hamdi, M; Puopolo, M; Pham, H; Sue, H-J, Tribology Intl., 103, 412-22, 2016.
4 Zhu, Z; Xia, Y; Niu, G; Liu, J; Wang, C; Jiang, H, Wear, 376-377, 1314-20, 2017.
5 Hossain, MM; Xiao, S; Sue, H-J; Kotaki, M, Mater. Design, 128, 143-9, 2017.
6 Hamdi, M; Zhang, X; Sue, H-J, Wear, 380-381, 203-16, 2017.