Influence of Chemical Activation of Aluminoborosilicate Glass Fabric on Its Hydrophobization with Radiation-Synthesized
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ATION CHEMISTRY
Influence of Chemical Activation of Aluminoborosilicate Glass Fabric on Its Hydrophobization with Radiation-Synthesized Tetrafluoroethylene Telomers G. A. Kichiginaa, *, P. P. Kushcha, D. P. Kiryukhina, **, V. G. Dorokhova, and V. V. Barelkoa aInstitute
of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia *e-mail: [email protected] **e-mail: [email protected] Received March 23, 2020; revised March 23, 2020; accepted April 20, 2020
Abstract—The process of hydrophobization of aluminoborosilicate glass fabric subjected to chemical activation by acid etching has been studied. The solutions of radiation-synthesized tetrafluoroethylene telomers having different chain lengths and chemically active terminal hydroxyl and amino groups have been used as a hydrophobizing agent. A comparative analysis of the efficiencies of various fiberglass activation methods and the use of telomers with different end groups for the production of hydrophobic materials has been performed. It has been found that treatment with tetrafluoroethylene telomer solutions makes it possible to obtain a hydrophobic fluorine-containing coating of fiberglass, which is characterized by a water contact angle of about 140°. Keywords: tetrafluoroethylene telomers, hydrophobization, aluminoborosilicate glass fabric, radiation synthesis, chemical activation DOI: 10.1134/S0018143920050082
In the production of hydrophobic fluoroplastic varnished fabrics, fiberglass is used as a base and a suspension of 4D fluoroplastic or Teflon powders is used as an impregnating medium. The fluoroplastic content of these fabrics is ~60–80 wt % [1]. This work is a continuation of previous studies [2–4], which proposed a new approach to the manufacture of fluorinecontaining hydrophobic aluminoborosilicate and silica fabrics. Radiation-synthesized solutions of tetrafluoroethylene (TFE) telomers with the general formula R1(C2F4)nR2 (R1 and R2 are the fragments of solvent molecules in which the synthesis was carried out, and n is the chain length) were used as water-repellent agents. The fluoropolymer content of a hydrophobic material does not exceed 5–10 wt %. The fiberglass was preliminarily subjected to desizing treatment and the fiberglass filler was chemically activated by acid etching to ensure better adhesion of telomers to the fiberglass surface. This treatment of the fabric has a positive effect on the process of hydrophobization and the production of a high-quality hydrophobic fluoropolymer coating of fiberglass. The novelty of the technical solution related to the activation of fiberglass surfaces and methods for the preparation of a glass– polymer composite material was protected by patents [5, 6]. In addition to the pretreatment of fiberglass, the properties of TFE telomers (thermal stability, adhesion, etc.), which primarily depend on their chain
length, composition, and chemical activity of terminal groups, affect the quality of the hydrophobic coating. The aim of this work was to perform a radiationchemica
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