One-part UV and abrasion resistant pigmented surfacing film composition for prepregs
A technology of veneer and composition, applied in the field of paint and traditional veneer substitute, alicyclic epoxy resin system, can solve the problem of no overhang function in the contour area, increase the weight of aerospace vehicles, etc., and achieve the elimination of harmful waste , reduce weight, reduce labor and cost effects
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Embodiment 1
[0062] Take 100 parts of Epalloy5000 cycloaliphatic epoxy resin, add 30 parts of bisphenol A and 10 parts of NIPOL1472 resin, and prepare a solution with a concentration of 20% (the solvent is methyl ethyl ketone (MEK)). The mixture was heated to 130°F while stirring, then 0.1 part of triphenylphosphine catalyst was added and the mixture was heated to 300°F. The temperature was maintained at 300°F for 1 hour, then the mixture was cooled to below 200°F, and MEK was added to reduce the solids content to 80%. The cycloaliphatic resin prereactant is used as a base for the surfacing film composition.
Embodiment 2
[0064] By weight, get 100 parts of cycloaliphatic resin pre-reactants in embodiment 1, add 20 parts of novolac epoxy resin DEN439 (Dow Chemical provides), hollow microspheres G-200 ceramic microspheres (3M provides, Minneapolis Lithium) 90 parts, amorphous silicon 8 parts, in order to control the viscosity of the above mixture, add the necessary solvent (MEK) to a solid content of about 80%. After mixing the above ingredients, add a curing agent (such as 8 parts of dicyandiamide and 2 parts of Omicure52 (provided by CVC Chemical)).
[0065] The above mixture was degassed to 80% solids by weight and then coated into a film with a film weight of 0.035 psf. The film was then dried to less than 1% by weight volatiles and the polyester random mat carrier was pressed into the film under low pressure so that the mat just adhered to the film.
Embodiment 3
[0067] Follow the same steps as in Example 2, except that 140 parts of alumina is used as filler instead of hollow microspheres.
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