Fluoropolymer compositions and coatings
A technology of composition and polymer, which is applied in the direction of coating, etc., can solve the problems of perfluoroelastomers and coating compositions that are difficult to prepare
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[0135] Preparation of Fluoropolymer Compositions
[0136] Fluoropolymer compositions can be prepared by mixing polymers, optional curing system and optional additives, and solvents. Preferably, the fluoropolymer is first compounded together with the other solid ingredients, and especially with the curing system. Compounding may be performed in conventional rubber processing equipment to provide a solid mixture, ie, a solid polymer with additional ingredients, also referred to in the art as a "compound." Typical equipment includes rubber mills, internal mixers (such as Banbury mixers), and mixing extruders. During mixing, the components and additives are uniformly distributed throughout the resulting fluorinated polymer "compound" or polymer flake. The compound is then preferably comminuted (for example by cutting into smaller pieces) and then dissolved in a solvent.
[0137] Method of preparing the coating
[0138] The coating can be prepared by adding the fluoropolyme...
Embodiment 1
[0155] In this example, a clear coat was prepared.
[0156] First, a perfluoroelastomer composition was prepared as follows: 100 parts by weight of a curable perfluoropolymer with the trade name PFE40Z (available from 3M Company, St. Paul, MN, USA) and 0.5 parts by weight of a peroxide curing agent with the trade name Trigonox (available from AkzoNobel Functional Chemicals, The Netherlands) and 0.5 parts by weight of an auxiliary agent (available from, for example, Lyman Wirth ( Lehman & Voss)) mixed.
[0157] This compounded preparation was cut into small pieces with a size of about 0.5 cm. These pieces were added to solvent-partially fluorinated polyether (1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl )-pentane) in a beaker. The solvent was added in an amount to make a solution containing 15% by weight of perfluoroelastomer. Place the beaker on a tumbler mixer and continue mixing overnight. Allow the perfluoroelastomer to completely dissolve. The viscosit...
Embodiment 2
[0161] In this example, similar to Example 5 but using PFE 7502 BZ - a black perfluoroelastomer compound (commercially available from 3M Company, St. Paul, MN, USA) ), to prepare a black coating. This compounded preparation was cut into small pieces with a size of about 0.5 cm. These pieces were added to the solvent (3-ethoxy-1,1,1,2,3,4,4,5,5,6,6,6-dodecafluoro-2-trifluoromethyl-hexane ) in the beaker. The solvent was added in an amount constituting a composition containing 10% by weight of the perfluoroelastomer compound. The beaker was placed on a tumbler mixer and stirring continued overnight, after which the compounds dissolved and formed a solution. The resulting formulation had a viscosity of 900 mPas.
[0162] The coating composition was then rod coated onto aluminum flakes measuring 15 cm x 7.5 cm using a standard rod coater, cured in an oven at 140°C for 5 minutes and optionally post-cured for a further 15 minutes at 200°C. Get a black coat.
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