High temperature resistant pi white label ink and preparation method thereof

Abstract

The invention discloses high-temperature-resistance PI white label ink and a preparation method thereof. The method comprises the following steps: mixing saturated polyester resin, partial organic solvent and a dispersing agent, and stirring for the first time; then, sequentially adding titanium dioxide and filler; stirring for the second time to obtain mixture; sanding the mixture; adding partial solvent, and uniformly dispersing to obtain a main ingredient; adding a curing agent and the rest solvent into the main ingredient, and uniformly dispersing to obtain the high-temperature-resistance PI white label ink. The high-temperature-resistance PI white label ink has reasonable composition and good ingredient coordination and excellent comprehensive performance of the system, and has the viscosity applicable to scraper coating with good storage performance. The system does not use matting agent to avoid adverse influence on product appearance and resin curing, has good curing performance and short curing time, can meet the product requirement for high temperature resistance, and is suitable for thermal transfer ribbon printing, so that an unexpected technical effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of inks, in particular to a high-temperature-resistant white ink used for PI substrates. Background technique [0002] Polyimide film (PolyimideFilm) is the best film insulating material in the world. It is made of pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (DDE) in a strong polar solvent through polycondensation and parallel flow. The extended film is formed by imidization, it is yellow and transparent, and the relative density is 1.39-1.45. The polyimide film has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and medium resistance. It can be used for a long time in the temperature range of -269°C to 280°C, and can reach a high temperature of 400°C in a short time; the glass transition temperatures are 280°C (Upilex R), 385°C (Kapton) and above 500°C (Upilex S). The tensile strength is 200MPa at 20°C and greater than 100MPa at 200°C. It...

AI Technical Summary

Problems solved by technology

The domestic PI white label ink has the problems of poor high temperature resistance and poor printing effect stability / / serious wire drawing during mass production and low yield

The existing PI white label ink has the following defects and deficiencies: ①The main problem of PI white label ink is the adhesion between the ink layer and the PI material. The PI film material is an emerging polymer material, and its adhesion problem has a high The difficulty is that the existing white ink has almost no adhesion on the film material to a large extent; ②Because it is a label ink, the printing performance of the ribbon is extremely high, and the printing performance of many existing inks is not good, and the barcode cannot be clearly transferred to the ink Coating; ③Existing inks cannot be mass-produced due to various reasons such as viscosity, and there are various defects in the coating process; ④Because electronic labels are often used in electrical labels such as circuit boards, their temperature resistance requirements are very high High, but the ink produced by the existing process cannot withstand high temperature after coating

[0004] At present, the country mainly relies on foreign imports, but the price is too high, reaching 300 yuan / square meter; at the same time, the coating of existing label inks is not ideal on PI, and the physical properties cannot meet the requirements.

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