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Coatings
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New Advances in Polyurethane Coatings and Its Application
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New Advances in Polyurethane Coatings and Its Application

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Functional Polymer Coatings and Films".

Deadline for manuscript submissions: closed (1 September 2022) | Viewed by 7520

Special Issue Editor

Dr. Gurunathan Thangavel

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Nanyang Technological University, Singpore
Interests: sol–gel coatings; smart coatings; sealants; UV-cure coatings, inks, and adhesives; waterborne and solventborne; vitrimers; PUDs; structure–property relationship; surface modification; latex coating; wood coatings; direct to metal coating; architecture coating, marine coating; oil-modified urethane; emulsions and colloids; bio-based raw materials

Special Issue Information

Dear Colleagues,

The polymers termed as binding media or resins are at the heart of coating formulations, since they not only hold the different ingredients of coating formulation together but also help to attain the desired physical, chemical, and mechanical properties. In general, polymeric systems used in coating formulations mainly determine the environmental footprint of the coating and, therefore, the development and selection of appropriate polymeric systems is very important. Various polymeric systems such as alkyd, polyester, epoxy, acrylics, polyurethane, polyamides/imides, amines, etc., have been used in the coatings arena. Amongst them, polyurethane (PU) is emerging as a polymeric system of choice for the development of eco-friendly sustainable functional coatings due to its versatile nature. Today, PUs can be found in virtually everything we touch – our desks, chairs, cars, clothes, footwear, appliances, beds, insulation in our walls and roofs, and moldings on our homes etc. PU coatings are applied to products to improve their appearance and lifespan. On cars, PU coatings give the exterior a high gloss and improved color retention while offering improved scratch and corrosion resistance. Other types of PU coatings are used in construction, where building floors, steel trusses, and concrete supports are spray coated to make them more durable and less costly to maintain.

In particular, the topics of interest include but are not limited to the following:

  • Coatings, adhesives, sealants, and elastomers
  • Tackifier chemistry and function
  • Polymers and coatings based on renewable bio-based raw materials
  • UV-cure, solventborne, and waterborne coatings
  • Polyurethane and vitrimer chemistry
  • Advanced next-generation self-healing polymers

Dr. Gurunathan Thangavel
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Published Papers (2 papers)

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Research

17 pages, 4453 KiB  
Article
Synthesis and Application of a Low Dye Absorption Waterborne Polyurethane for Microfiber Synthetic Leather
by Wenyu Cai, Wei Xin, Haonan Zhang and Yunjun Luo
Coatings 2022, 12(6), 728; https://doi.org/10.3390/coatings12060728 - 25 May 2022
Cited by 6 | Viewed by 2296
Abstract
As increasing attention is being paid to harmful residual dye pollution in the dyeing effluent from the microfiber synthetic leather industry, there is an urgent need to explore innovative ways to alleviate such pollution. Here, a low-polarity waterborne polyurethane (WPU) was synthesized using [...] Read more.
As increasing attention is being paid to harmful residual dye pollution in the dyeing effluent from the microfiber synthetic leather industry, there is an urgent need to explore innovative ways to alleviate such pollution. Here, a low-polarity waterborne polyurethane (WPU) was synthesized using hydroxyl-terminated polybutadiene (HTPB) and polypropylene glycol (N220) as soft segments to react with –NCO on isophorone diisocyanate (IPDI). The structure and properties of modified waterborne polyurethane were characterized by Fourier Transform Interferometric Radiometer (FTIR), and emulsion characterization was performed, including particle size and zeta potential analysis, tensile test, thermal properties test, and contact angle test. The SEM and alkali reduction rate results showed that increasing the HTPB content decreases the alkali reduction rate by blocking the penetration of corrosive ions by the double bond cross-link structure, but higher HTPB addition (>40%) leads to an enhancement in phase separation, which contributes to an increase in the alkali reduction rate. The results of the UV spectrum analysis showed that when the amount of HTPB added was 50%, the coloration rate reached 81.27% compared with 13.18%, which was 68.09% higher than that of the unmodified microfiber leather. The binding of the dry and wet rubbing color of the modified microfiber leather with the addition of 50% HTPB reached grades of 4–5 and 3–4, respectively, which meets most application requirements without subsequent washing. Full article
(This article belongs to the Special Issue New Advances in Polyurethane Coatings and Its Application)
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14 pages, 2497 KiB  
Article
UV Curable Coatings Based on Urethane Acrylates Containing Eugenol and Evaluation of Their Antimicrobial Activity
by Paulina Bednarczyk, Agnieszka Wróblewska, Agata Markowska-Szczupak, Paula Ossowicz-Rupniewska, Małgorzata Nowak, Marcin Kujbida, Adrianna Kamińska and Zbigniew Czech
Coatings 2021, 11(12), 1556; https://doi.org/10.3390/coatings11121556 - 17 Dec 2021
Cited by 5 | Viewed by 3775
Abstract
This work presents studies on the obtaining of UV-curable coatings with antimicrobial activity. Urethane acrylates (UAs) have excellent physicochemical properties including high reactivity in systems with radical photoinitiators in the presence of UV radiation and good balance between hardness and flexibility in the [...] Read more.
This work presents studies on the obtaining of UV-curable coatings with antimicrobial activity. Urethane acrylates (UAs) have excellent physicochemical properties including high reactivity in systems with radical photoinitiators in the presence of UV radiation and good balance between hardness and flexibility in the formed coatings. At the same time, eugenol is well known as the compound hindering the growth of various microorganisms. Hence, the materials obtained by the modification of UA resins with eugenol can be used to protect various surfaces, especially against microorganisms. This study aimed to examine the influence of the amount of eugenol on the chemical, physical, thermal, and mechanical properties of the obtained UA coatings and find the conditions at which the optimal properties for industrial applications such coatings can be achieved. These materials were successfully obtained. Taking into account that eugenol is a very cheap reactant, and it can be obtained from natural sources by the simple distillation method, the proposed method combined the good points of obtaining protective coatings by UV curing with the utilization of vegetable, renewable reactants (biomass), such as components giving special properties to these materials, in this case, antimicrobial properties. In this study, photoreactive coatings with antimicrobial properties for the following microorganisms: fungi (C. albicans), Gram-positive bacteria (S. epidermidis) as well as Gram-negative bacteria (E. coli), were obtained. The obtained coatings were cured over a short time. They were colorless and characterized by a wide range of properties and applications. Full article
(This article belongs to the Special Issue New Advances in Polyurethane Coatings and Its Application)
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