Teflon chemical treatment
Since PTFE low surface activity and is not limiting its viscosity composite materials with other compound, especially PTFE film adhesion with other reinforcing materials, the FE material must be some surface modification in order to improve its surface activity. PTFE surface modification technologies commonly used chemical treatment, high temperature melting, radiation grafting method, a plasma processing method and laser radiation modification method [11]. The basic design idea of these methods, or to introduce polar groups, enhance the interface binding force; or eliminate weak boundary layer formed on the surface layer of strengthening; or adjust the surface roughness of the anchor effect is given.
Chemical etching treatment mainly through chemical reaction with PTFE, tear off portion on the material surface fluorine atom, the carbon layer left on the surface, and some polar groups. Studies have shown that the introduction of the PTFE surface hydroxyl group, a carbonyl group and an unsaturated bond such as polar groups, to make the surface energy increases, the contact angle, wettability is improved, the viscosity becomes difficult to be sticky, it is of All surface treatment method is better, but also more commonly used methods. The most commonly used is a sodium naphthalene solution method.
Solution is a sodium naphthalene, sodium naphthalene in tetrahydrofuran, ether, ethylene glycol dimethyl ether, dissolving or complexing activity made. Na the outermost electron transfer to the empty orbital of naphthalene to form a radical anion, and then with Na ion pair formation, the release of a large amount of resonance energy, generated a dark green mixed solution of organometallic compound. High reactivity of these compounds, when in contact with PTFE, sodium can damage the C-F bond, removal of PTFE fluorine atoms on the surface of the part, so that left on the surface of the carbide layer and some polar groups. IR spectra show that the introduction of the modified PTFE surfaces of C = 0, C: C, COOH and other polar groups, such groups can surface energy increases, the contact angle, wettability improved, changed from hard stick to be sticky, which is a more classic, and practical method is better.
LI Zi-dong et al found that PTFE in a sodium naphthalene solution treated, neoprene - phenolic adhesive bonding. XU Bao activated using a sodium naphthalene solution PTFE surface, with the electron spectrometer for activation and without activation of the PTFE surface were analyzed. Both studies indicate that after this treatment the surface properties of PTFE have been very good improvement.
Chemical etching treatment mainly through chemical reaction with PTFE, tear off portion on the material surface fluorine atom, the carbon layer left on the surface, and some polar groups. Studies have shown that the introduction of the PTFE surface hydroxyl group, a carbonyl group and an unsaturated bond such as polar groups, to make the surface energy increases, the contact angle, wettability is improved, the viscosity becomes difficult to be sticky, it is of All surface treatment method is better, but also more commonly used methods. The most commonly used is a sodium naphthalene solution method.
Solution is a sodium naphthalene, sodium naphthalene in tetrahydrofuran, ether, ethylene glycol dimethyl ether, dissolving or complexing activity made. Na the outermost electron transfer to the empty orbital of naphthalene to form a radical anion, and then with Na ion pair formation, the release of a large amount of resonance energy, generated a dark green mixed solution of organometallic compound. High reactivity of these compounds, when in contact with PTFE, sodium can damage the C-F bond, removal of PTFE fluorine atoms on the surface of the part, so that left on the surface of the carbide layer and some polar groups. IR spectra show that the introduction of the modified PTFE surfaces of C = 0, C: C, COOH and other polar groups, such groups can surface energy increases, the contact angle, wettability improved, changed from hard stick to be sticky, which is a more classic, and practical method is better.
LI Zi-dong et al found that PTFE in a sodium naphthalene solution treated, neoprene - phenolic adhesive bonding. XU Bao activated using a sodium naphthalene solution PTFE surface, with the electron spectrometer for activation and without activation of the PTFE surface were analyzed. Both studies indicate that after this treatment the surface properties of PTFE have been very good improvement.
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