Primer and preparation method thereof, raw material formula, coating process and BOPET film
A primer and raw material technology, applied in polyester coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor versatility of primers
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[0025] Further, the present invention also provides a preparation method of the primer, comprising: mixing deionized water, a wetting agent, and a stock solution.
[0026] In the preparation method of the primer in this embodiment, the equipment used is a stirring tank with automatic metering of deionized water, an electronic scale and the like. According to the primer formula, weigh in proportion and add to the mixing tank in order, deionized water→wetting agent→stock solution, the temperature of the mixing tank is 20-25°C, the stirring speed is 150-200 rpm, and the stirring time is 15-20 minutes , ready to use.
[0027] Further, the present invention also provides a primer prepared by the aforementioned preparation method.
[0028] Further, the present invention also provides a BOPET film, comprising: a base film, and an undercoat layer on the surface of the base film; wherein the undercoat layer is suitable for being formed by coating the aforementioned undercoat agent.
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Embodiment 1
[0034] The off-line coated BOPET film is prepared by the off-line coating process. The main equipment, tools and materials are as follows: coating machine production line (including coating machine head, drying oven, cooling winder), bottom-coated BOPET film roll (thickness 0.125 mm), wire rod (10u), electronic scale, etc. The off-line coating process is as follows: off-line coating of the aforementioned primer; drying at 80-120°C; cooling and winding to obtain an off-line coated BOPET film. Wherein the primer raw material formula includes: deionized water, acrylic emulsion (model is but not limited to DSM A1127, solid content is 44%), polyurethane emulsion (model is but not limited to Jietu 408A, solid content is 20%, In this case, the mass ratio defined as polyurethane emulsion Ⅰ) and wetting agent (mixture of isopropanol and the like) is 75:10:10:5.
Embodiment 2
[0036] The BOPET film of off-line coating is prepared by off-line coating process. The difference between Example 2 and Example 1 is that polyurethane emulsion I (model is but not limited to Jietu 408A, solid content is 20%) is replaced by an equivalent amount of polyurethane Emulsion II (the model is but not limited to Changxing 89216, with a solid content of 35%, defined as polyurethane emulsion II in this case).
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Abstract
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