Coatings and methods for particle reduction
A coating and substrate technology, applied in the field of high-purity equipment, can solve the problems of medium and read/write head damage, difficult to uniform coating, difficult particle shedding, etc., to improve cleaning resistance, handling and wear resistance. , the effect of low surface energy
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Embodiment 1
[0087] Into a flask equipped with a stirrer was added 25 g HFPOMA, 10 g BA (from Aldrich Chemical Company of Milwaukee, Wisconsin), 10 g A174 (from United Chemical Technologies of Bristol, New Jersey), 5 g MPTS (from United Chemical Technologies, Inc.) and 250g of 3M NOVEC7200 engineering fluid (methoxy-perfluorobutane (C 4 f 9 OC 2 h 5 ) from 3M Company, St. Paul, Minnesota) to prepare copolymers. ) The solution was purged with nitrogen for 5 minutes. Then, 1 g of LUPEROX 26M50 initiator (tert-butyl peroxy(2-ethylhexanoate), 50% solids, available from Arkema, Inc. of Philadelphia, Pennsylvania) was added to the flask. The solution was stirred under nitrogen and heated to 65°C for 18 hours. The solution was diluted to 10% polymer with 3M NOVEC 7200 Engineering Fluid. The polymer solution was catalyzed by the addition of KRYTOX 157FSL (polyperfluoroalkyl ether carboxylic acid, available from E.I. du Pont De Nemours Company of Deepwater, New Jersey) at 2% of the polymer, i...
Embodiment 2
[0090]Copolymers were prepared by adding 30 g HFPOMA, 5 g BA, 10 g A174, 5 g MPTS and 250 g 3M NOVEC 7200 Engineering Fluid to a flask equipped with a stirrer. The solution was purged with nitrogen for 5 minutes. Then, 1 g of LUPEROX 26M50 initiator was added to the flask. The solution was stirred under nitrogen and heated to 65°C for 18 hours. The solution was diluted to 10% polymer with 3M NOVEC 7200 Engineering Fluid. The polymer solution was catalyzed by the addition of KRYTOX 157FSL at 2% of the polymer, ie about 0.2% of the overall solution.
[0091] Clean the Al5052H32 test piece with Cleaning Method 1. These coupons were then coated with the polymer solution using the method described above at a pull rate of 2.54 mm / sec (6 in / min). A two-step cure was employed, with the first step curing at 85°C for 1 hour and the second step curing at 150°C for 1 hour. Solvent extraction testing showed the coating to be 86% cured. Table 1 shows the LPC extraction results for the...
Embodiment 3
[0102] Add 15g FBSEA, 26g BA, 4.5g A174, 1.5g MPTS, 3.0g CN973J75 (from Sartomer Company, Inc. of Exton, Pennsylvania) to a flask equipped with a stirrer, 100g 3M TM Copolymers were prepared with NOVEC 7200 engineering fluid and 100 g of ethyl acetate (product number EX0241 from EMD Chemicals, Inc. of Gibbstown, New Jersey). The solution was purged with nitrogen for 5 minutes. Then, 0.5 g of VAZO67 (from DuPont) was added to the flask. The solution was stirred under nitrogen and heated to 65°C for 16 hours. use 3M TM A 50 / 50 mass blend of NOVEC 7200 Engineering Fluid and ethyl acetate diluted the solution to 10% polymer. The polymer solution was catalyzed by the addition of KRYTOX 157FSL at 3% polymer, ie about 0.3% of the overall solution.
[0103] Clean Al5052H32 and SS304 test coupons with Cleaning Method 2. These coupons were then coated with the polymer solution using the method described above at a pull rate of 2.54 mm / sec (6 in / min). A two-step cure was employed, ...
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