Synthesis of waterborne polyurethane ink binder with high T‐peel strength and its application in biaxially oriented polypropylene film printing

In order to improve adhesion properties of waterborne polyurethane (WPU) inks on biaxially oriented polypropylene (BOPP) films, herein, a liquid polyester polyol BY3003 with long‐branched aliphatic chains was used to prepare WPU latexes suitable for BOPP films printing. The application of BY3003 mad...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-05, Vol.138 (17), p.n/a
Main Authors: Zhang, Mingguang, Lian, Xiuye, Cui, Jialiang, Li, Xiaoyu, Wang, Haiqiao
Format: Article
Language:English
Subjects:
Adhesion
BOPP film
Butyric acid
Chain branching
Ink
Inks
Latex
Materials science
Peel strength
Polymers
Polypropylene
Polyurethane resins
Strength
Surface tension
T‐peel strength
Waterborne polyurethane
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Summary:In order to improve adhesion properties of waterborne polyurethane (WPU) inks on biaxially oriented polypropylene (BOPP) films, herein, a liquid polyester polyol BY3003 with long‐branched aliphatic chains was used to prepare WPU latexes suitable for BOPP films printing. The application of BY3003 made the surface tension of the prepared latexes not more than 43 mN/m, while that of traditional WPU latex exceeded 55 mN/m. Accordingly, the T‐peel strength of the inks made from these latexes was all above 0.8 N/15 mm. In addition, post chain extension degree, dimethylol butyric acid content, and NCO/OH molar ratio also had significantly effect on latex and film properties of WPU, especially on the T‐peel strength of the corresponding inks. By optimizing these factors, a WPU latex with surface tension as low as 39.6 mN/m and adhesion fastness over 95% on BOPP film were obtained, and the T‐peel strength of its corresponding ink was up to 2.05 N/15 mm, which is the highest value recorded in the literature as far as we know. Waterborne polyurethane latex was synthesised by using a long alkyl side chain containing polyester polyol, and the water‐based ink was prepared by using the as prepared latex as a binder. It is worth noting that the ink has good T‐peel strength, which is up to 0.25 N/15 mm.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.50273