Abrasion resistant coating composition with inorganic metal oxides
A composition and coating technology, applied in the direction of coatings, radiation-absorbing coatings, primers, etc., can solve the problems of other coating properties such as optical transparency, adhesion and wear resistance.
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[0051] Contains CeO 2 Preparation of the coating solution
[0052] Example S-1. Preparation of a Silicone Hardcoat Solution Containing Cerium Oxide.
[0053] The ceria-containing resin solution was prepared by hydrolyzing methyltrimethoxysilane (MTMS) in a colloidal ceria solution. A colloidal cerium oxide dispersion (Sigma Aldrich: 20% by weight solids, 2.5% by weight acetic acid stabilized, aqueous) was charged to a vial. Add MTMS to the chilled ceria solution over about 20 min. The mixture was left to stand and stirred at room temperature for several hours. Then, 1-methoxy-2-propanol (MP) was mixed in and the reaction was left to stand at room temperature for a few more days. The reaction mixture was then further reduced with isopropanol. A curing catalyst is added to the solution, followed by other additives, such as flow control additives. Table 1 shows example formulations of cerium oxide sols. The ceria and catalyst charges used to formulate the ceria sols were a...
Embodiment S-2
[0056] Example S-2. Alternative Preparation of Silicone Hardcoats Containing Cerium Oxide.
[0057] Cerium oxide-siloxanol hydrolysis was prepared by adding cerium oxide sol (Sigma Aldrich, 20 wt% solids, 2.5 wt% acetic acid stabilized, aqueous) to an Erlenmeyer flask and cooling to 2 sol while stirring the mixture. The resulting hydrolyzate was allowed to warm to room temperature and stirred for an additional 16 hours. The hydrolyzate was then diluted by adding 1-methoxy-2-propanol and isopropanol and left to age at room temperature for 3 days. Then by adding NH 4 OH solution adjusted the pH of the hydrolyzate to 5.1. Then to the ceria-siloxanol hydrolyzate mixture was added 331 polyether modified polydimethylsiloxane (available from Byk-Chemie GmbH) and tetrabutylammonium acetate (as a 39.9% by weight aqueous solution). Table 2 shows the charge used to formulate ceria siloxanol coating solution Example S-2, which formulation had a measured solids of 25.8% by weight. Th...
Embodiment S-3
[0060] Example S-3. Preparation of a Silicone Hardcoat Containing Cerium Oxide and Colloidal Silica.
[0061] Cerium oxide-siloxanol hydrolysis was prepared by adding cerium oxide sol (Sigma Aldrich, 20 wt% solids, 2.5 wt% acetic acid stabilized, aqueous) to an Erlenmeyer flask and cooling to 2 sol while stirring the mixture. The resulting hydrolyzate was allowed to warm to room temperature and stirred for an additional 16 hours. The hydrolyzate was then diluted by adding 1-methoxy-2-propanol. The hydrolyzate was then aged by standing at room temperature for three days.
[0062] Colloidal silica-siloxanol hydrolyzate was prepared by adding colloidal silica sol (Nalco 1034A, 34.7 wt% solids, aqueous) to an Erlenmeyer flask and cooling to 2 sol while stirring the mixture. The resulting hydrolyzate was allowed to warm to room temperature and stirred for an additional 16 hours. The hydrolyzate was then diluted by adding isopropanol. The hydrolyzate was then aged by standing at...
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