Anti-Wetting, Low Adhesion Coatings For Aqueous Ink Printheads
A technology of water-based ink and inkjet printing head, which is applied in coating, printing, polyurea/polyurethane coating, etc., and can solve problems such as failure and low salivation pressure
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example 1
[0082] Example 1 - Preparation of coating
[0083] 38.3 grams of E10H was added to a 3 neck round bottom flask equipped with dropping funnel, temperature probe and condenser. 245mL of Novec TM 7200, 170 mL of ethyl acetate and 0.333 g of dibutyltin dilaurate catalyst were added to the 3 necked round bottom flask, stirring and heating the contents to gentle reflux (-71 °C) under nitrogen atmosphere. By adding 11.6 grams of 3790 dissolved in 445 mL of ethyl acetate and 145 mL of Novec TM 7200 to prepare the second solution. The triisocyanate solution was then transferred to a dropping funnel attached to a round bottom flask and added dropwise to E10H solution. The resulting reaction mixture was stirred overnight (about 18 hours). After cooling to room temperature, use the Millipore The product solution was filtered through an XL filter (0.2 micron pore size) to produce a product solution. The solids concentration of the product solution was -4-5%.
[0084] By addin...
example 2
[0086] Example 2. Contact Angle and Sliding Angle
[0087] The coatings prepared according to Example 1 were evaluated for contact and sliding angles on an OCA20 goniometer from Dataphysics. In a typical static contact angle measurement, about 10 microliters of aqueous ink was gently deposited on the surface of the coating of Example 1, and the static angle was determined by computer software (SCA20). Each reported data is the mean of >5 independent measurements.
[0088] Slip angle measurements were accomplished by tilting the base unit with approximately 10 microliters of droplet aqueous ink (from Collins Inkjet Corporation, Cincinnati, Ohio) at a rate of 1° / sec. The sliding angle is defined as the inclination angle at which the test drop starts to slide.
[0089] An offline test (so-called stacking) was used to simulate bonding during printhead manufacturing. The coatings were subjected to high pressure and high temperature stress, ie 290° C. at 350 psi for 30 min, after...
example 3
[0097] Example 3. Contact and sliding angles of aqueous inks after head construction
[0098] The print head was fabricated as follows. By applying the low-adhesion moisture-resistant coating 26 as described in Example 1 to a polyimide film available from Ube Industries (Ube Industries) On the outer surface of the prepared orifice plate 24, prepare figure 2 The polyimide hole assembly shown in. Using high temperature thermoplastic adhesives (i.e. from ELJ-100 thermoplastic polyimide film) at 350 psi at 290° C. for half an hour to bond the stainless steel sparger 22 to the orifice plate (coated polyimide film). Use a laser to ablate the nozzles in the orifice plate. The resulting polyimide orifice assembly was then attached and bonded to the jet stack / PZT assembly and manifold to create a printhead.
[0099] Commercial aqueous inks were evaluated for contact angle (CA) and sliding angle (SA) before and after head build as described above in Example 2. Fluoropolymer (PF...
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