Found that after PTFE was treated in a sodium-naphthalene solution, it was bonded with a chloroprene-phenolic adhesive. When in contact with PTFE, sodium PTFE Fusing Belts can break the C\u0026mdash;F bond and remove part of the fluorine atoms on the surface of PTFE, thus leaving a carbonized layer and some polar groups on the surface.
The chemical treatment method is mainly through the chemical reaction between the corrosive liquid and the PTFE to tear off part of the fluorine atoms on the surface of the material, leaving a carbonized layer and some polar groups on the surface.Due to the extremely low surface activity and non-stickiness of PTFE, it is limited to its compounding with other composite materials, especially the bonding of PTFE film with other framework materials, so certain surface modification of FE material must be carried out to improve its surface activity.
Na transfers the outermost electrons to the empty orbital of naphthalene to form anion radicals, and then forms an ion pair with Na, releasing a large amount of resonance energy, forming a dark green metal organic compound mixed solution. The basic design ideas of these methods are either to introduce polar groups to enhance the bonding force of the interface; or to eliminate the weak interface layer to form a strengthened surface layer; or to adjust the surface roughness to give an anchoring effect. The infrared spectrum shows that the modified PTFE surface introduces polar groups such as C=0, C:C, COOH, etc. Li Zidong et al. Studies have shown that the introduction of polar groups such as hydroxyl, carbonyl and unsaturated bonds on the surface of PTFE can increase the surface energy, reduce the contact angle, improve the wettability, and change from difficult to sticky.
This is the current research Among all the surface treatment methods, the effect is better and one of the more commonly used methods. At present, the sodium-naphthalene solution method is commonly used. Sodium-naphthalene solution is formed by dissolving or complexing sodium and naphthalene in active ethers such as tetrahydrofuran and ethylene glycol dimethyl ether. The results of these two studies show that the surface properties of PTFE have been well improved after this treatment.
These groups can increase the surface energy, reduce the contact angle, improve the wettability, and change from difficult to stick. These compounds have high reactivity. To be sticky, this is a more classic method with better practical effects. Commonly used surface modification techniques for PTFE include chemical treatment, high temperature melting, radiation grafting, plasma treatment and laser radiation modification [11]. Xu Baoguo used sodium-naphthalene solution to activate the PTFE surface, and analyzed the activated and unactivated PTFE surface with an electron energy spectrometer
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