Development of a non-fluorinated oil / grease resistant
Shun Shibata
Daikin Industries, Ltd.,
1. Introduction
2. Features of XP-8001
2-1. Monomer synthesis / polymer design
For stable oil resistance at high temperatures, CH3 ends must be placed into an ideal arrangement. Through our proprietary monomer synthesis technology, we accomplished this by constructing a molecular structure that generates an anchor at the base of the side chain that contacts the main chain. This resulted in higher contact angles compared to general-purpose technologies. Furthermore, by increasing the heat resistance of the molecular structure that generates the anchoring, stable oil resistance becomes possible even at high temperatures.Fig.1 Contact angle comparison of XP-8001 and general-purpose technologies
2-2. Properties
Table 1 shows the properties of XP-8001 for surface treatments, developed as a coating in order to use existing application methods such as a size press. The cationic self-dispersing oil-resistant agent was designed to promote anionic adhesion to the pulp surface. The combined use of starches is essential as a binder.Table.1 General physical properties of XP-8001
* The above numeric values are representative and not guaranteed.
2-3. Evaluation example
The following effect can be obtained by using XP-8001, and the evaluation effect is shown in Table 2. Combining starches makes it possible to obtain good oil resistance with a relatively thin film. Because oil resistance can be obtained even with a thin film coating, re-defibration remains possible for treated paper due to water dispersibility that retains air permeability.Table.2 Evaluation example of XP-8001
- Treatment conditions
- - Processing method: Size press
- - Modified starch: Ethylated modified starch
- - Evaluation method: KIT (TAPPI T 559 cm-2)
- Physical properties of base paper
- - Basis weight: 48 gsm
- - Cobb 60: 45 gsm
- - Air permeability: 200 sec
2-4. Oil resistance
Oil resistance was evaluated by KIT: TAPPI T 559 cm-02. It is important to note that the oil-resistant agent exhibits excellent oil resistance even when the coating amount is small. XP-8001 showed high oil resistance even with a low coating amount. compared with starch-coated products, KIT: 5 was achieved with a coating amount of 1/12 or less.Fig.2 Relation between coating amount of each oil-resistant agent and KIT value
2-5. Air permeability
Air permeability was evaluated by the Gurley test method using air resistance as an index. Fig. 3 measures the number of seconds it takes for 100 cc of compressed air to pass through the test piece at the air resistance corresponding to KIT in Fig. 2. In general, when the coating amount of the agent is increased, gaps between the fibers become smaller and density increases, so the air permeability of the treated paper decreases. As a result, the air resistance increased in the order of TG-8111, XP-8001, and starch in proportion to the amount of coating. The air resistance of the XP-8001-coated product was about 1/25 lower than that of the starch-coated product. From this, XP-8001 was able to impart oil resistance without significantly impairing the air permeability of the base paper.Fig.3 Relationship between KIT value and air resistance of each oil-resistant agent
2-6. Recyclabilitys
Paper can be recycled as a raw material by defibrating used paper and wastepaper. Recycling paper helps reduce deforestation. Defibration is an important element of recyclability and we evaluated whether XP-8001 inhibited the defibration. Results confirmed that paper treated with XP-8001 could be returned to pulp slurry when processed with a defibering machine. Furthermore, when the degree of dispersion of the sample after defibration was observed with a microscope, it was confirmed that the dispersion was almost the same as that of the base paper. From this fact, XP-8001 does not impede the defibration properties of the base paper, enabling even treated paper to be recycled.Fig.4 Results of re-defibration of base paper and treated paper
3. Comparative evaluation with other existing technologies
Table.3 General physical properties of XP-8001
4. Practical evaluation
Fig.5 Evaluation according to actual use
(Oil resistance)
Fig.6 Evaluation according to actual use
(Folded part)
5. Conclusion
1) Nobuo Ishikawa, Yoshiro Kobayashi, Fluorine Compounds - Their Chemistry and Applications, Kodansha Scientific, Ltd., 1979, p. 237
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