Waterproof and Water Repellent Textiles and Clothing
First Edition
John Williams
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ISBN: 978-0-08-101212-3 (print)
ISBN: 978-0-08-101134-8 (online)
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Contributors
Riza Atav University of Namk Kemal, Tekirda, Turkey
Jeni Bougourd Consultant, London, United Kingdom
Seong-O Choi Kansas State University, Manhattan, KS, United States
Lumina Ciobanu Gheorghe Asachi Technical University of Iai, Iai, Romania
Irina Cristian Gheorghe Asachi Technical University of Iai, Iai, Romania
Prince Dabhi Institute of Chemical Technology, Matunga, India
Alice J. Davies University of Leeds, Leeds, United Kingdom
Angela Davies De Montfort University, Leicester, United Kingdom
Miyu Du University of Leeds, Leeds, United Kingdom
Nicholas W.M. Edward University of Leeds, Leeds, United Kingdom
Parikshit Goswami University of Leeds, Leeds, United Kingdom
Lauren Heine Northwest Green Chemistry, Spokane, WA, United States
Dorin Ionesi Gheorghe Asachi Technical University of Iai, Iai, Romania
Zehra Evrim Kanat Namk Kemal University, Tekirda, Turkey
Veronika Kapsali University of the Arts London, London, United Kingdom
Asimananda Khandual College of Engineering & Technology, Bhubaneswar, India
Jooyoun Kim Seoul National University, Seoul, Republic of Korea
Carmen Loghin Gheorghe Asachi Technical University of Iai, Iai, Romania
Emil Loghin Gheorghe Asachi Technical University of Iai, Iai, Romania
Ameersing Luximon The Hong Kong Polytechnic University, China
Ningtao Mao University of Leeds, Leeds, United Kingdom
Jan Marek INOTEX Ltd, Dvr Krlov n.L., Czech Republic
Lenka Martinkov INOTEX Ltd, Dvr Krlov n.L., Czech Republic
Jane McCann Design Consultant, Northern Ireland, United Kingdom
Roshan Paul University of Beira Interior, Covilh, Portugal
Silvia Pavlidou Materials Industrial Research and Technology Center, Athens, Greece
Natalie Pomerantz US Army Natick Soldier Research, Development and Engineering Center, Natick, MA, United States
Usha Sayed Institute of Chemical Technology, Matunga, India
Quoc T. Truong US Army Natick Soldier Research, Development and Engineering Center, Natick, MA, United States
Margaret H. Whittaker ToxServices LLC, Washington, DC, United States
Hikmet Ziya zek University of Namik Kemal, Tekirda, Turkey
Part One
Principles of waterproofing and water repellency in textiles
Introduction to waterproof and water repellent textiles
Carmen Loghin; Lumina Ciobanu; Dorin Ionesi; Emil Loghin; Irina Cristian Gheorghe Asachi Technical University of Iai, Iai, Romania
Abstract
Waterproof materials have an extraordinarily high use, with products for everyday clothing, sportswear and protective clothing for industrial or technical applications. The chapter begins with a review of the specific requirements imposed by the use of waterproofing and water repellent textile materials, on the assumption that waterproofing as a dominant function must harmonize with other functions by providing multifunctional products to the end user. Examples of this are breathable materials designed to create clothing that simultaneously provide waterproofing and wearing comfort. To fully understand how to make waterproof and water repellent materials, it is essential to have knowledge of textiles and clothing products and their behaviour in relation with the humidity, liquid and vapours. A key issue addressed in the chapter refers to technologies and methods for development of waterproof and water repellent textile materials, with emphasis on materials coated with polymers and those with surface treatments (plasma treatments, hybrid finishing, nano-coating, etc.).
Keywords
Multifunctional textiles; Breathable fabrics; Repellency; Contact angle; Coated fabrics; Laminated fabrics; Superhydrophobic fibres; Surface treatments
1.1 Introduction
Protection against environmental factors is the initial function of clothing. In a wet environment, the basic requirement for garments is to keep the wearer dry by being waterproof and or water repellent. The difference between the two terms is essential when characterizing the behaviour of textile materials in reference to liquid water. In contact with water, water repellent materials form drops that can be easily removed from the fabric surface but for longer contact with water or with a higher pressure difference, the material will absorb water. Water repellent textiles are often high density woven materials made of very fine yarns or common materials with hydrophobic surface treatment. Waterproofing is defined as the property of a material not to be penetrated by fluids. The waterproofness of a fabric can be measured using two testing methods: one that simulates raining and the other (more common) that subjects the fabric to hydrostatic pressure. The minimum value for the hydrostatic pressure without leaking at its surface, at which a fabric is considered rainproof is 5000 mm water column, while for waterproof materials the hydrostatic pressure can reach 10,00015,000 mm water column (). For high quality waterproof materials designed for aggressive conditions, the hydrostatic pressure varies between 15,000 and 30,000 mm water column. Such fabrics are completely waterproof even under very high pressure.