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Other Applications of Glycerine
Published in Eric Jungermann, Norman O.V. Sonntag, Glycerine, 2018
One of the important natural resins is rosin. Rosin is combined with glycerine and used as ester gum. The ester gum is resistant to water, the rosin itself is not, and in addition has a high acid value. When you react rosin with 12–15% glycerine at about 250°C, it becomes an important additive to formulations based on cellulose nitrate and acetate, vinyl resins, and rubber, both natural and synthetic. The alkyds previously discussed can be blended with a great variety of polymeric resins. They are excellent bonding agents for cellulosic films, rubber, wood, textiles, and wood.
Combining a bio-based polymer and a natural antifoulant into an eco-friendly antifouling coating
Published in Biofouling, 2020
Ho Yin Chiang, Jiansen Pan, Chunfeng Ma, Pei-Yuan Qian
It is common for AF coatings to show a reduced AF performance in later stages as the degradation or self-polishing rate of the polymer decreases with time. The addition of rosin can help improve the later performance of the coatings (Ma et al. 2017). Rosin is a naturally occurring resin extracted from trees (Yebra et al. 2005). It is a common raw material for AF coatings with the ability to form films. Rosin is soluble in water, thereby facilitating the hydrolysis of the polymer in water (Ma et al. 2017). In the present study, the results in the field test were consistent with the release rate measurements, suggesting that rosin could be added to improve the release rate of butenolide by increasing coatings’ self-polishing rate and thus improving the AF ability of the coating. Indeed, rosin improved the release rate of butenolide and enhanced the field performance of coatings. By adding different amounts of rosin, the release rate of butenolide can be controlled. All these properties make PLA-PU50 an attractive binder and carrier for future AF coating development.