Coatings for Solderable Wires for the Modern Electric Industry

Rost, Simon

doi:10.1002/mame.200700366

Macro Materials & Eng

2008

DOI: 10.1002/mame.200700366

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Coatings for Solderable Wires for the Modern Electric Industry

Simon Rost¹

Abstract: The scientific and industrial history of polyurethane wire enamels during the previous six decades is reviewed. Their main use is as coatings for wires in miniature electrical devices and in electronics, where fast solderability at low temperatures is crucial. Market trends for polyurethane enamels are discussed, and an outlook is provided as to how future developments might influence the industrial use of polyurethane wire enamels.magnified image

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Cited by 3 publications

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Preparation and characterization of polyurethane electrical insulating coatings derived from novel soybean oil‐based polyol

Jalilian¹,

Yeganeh²,

Nekoomanesh‐Haghighi³

2009

Polymers for Advanced Techs

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As a viable alternative to the petrochemical polyols in polyurethanes (PUs), a new soybean oil‐based polyol (PSBO) with high functionality of hydroxyl groups and built‐in (preformed) urethane bonds was introduced. At first, a facile and improved method was developed for the transformation of epoxidized soybean oil (ESBO) to carbonated soybean oil (CSBO). Then ring‐opening reaction of carbonated oil with ethanolamine (ETA) led to the polyol. After characterization by conventional spectroscopic and analytical methods, PSBO was used for the formulation of novel one‐pack PU electroinsulating wire enamels. Tunable mechanical, thermal, and electrical properties for the final PUs were achieved by replacing 10 wt% of PSBO with poly(propylene glycol) (PPG) at different number average molecular weights of 725, 1000, 2000, 4000. Investigation of the results showed that these soy‐based PUs offer excellent thermal and electrical insulating properties. Copyright © 2009 John Wiley & Sons, Ltd.

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Preparation and characterization of polyurethane electrical insulating coatings derived from novel soybean oil‐based polyol

Jalilian¹,

Yeganeh²,

Nekoomanesh‐Haghighi³

2009

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

Synthesis and properties of polyurethane networks derived from new soybean oil‐based polyol and a bulky blocked polyisocyanate

Jalilian¹,

Yeganeh²,

Nekoomanesh‐Haghighi³

2008

Polymer International

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BACKGROUND: Developing vegetable oil‐based polyols for polyurethane manufacturing is becoming highly desirable for both economic and environmental reasons. Most vegetable oils do not bear hydroxyls naturally. The objective of this work was to prepare a new soybean oil‐based polyol with high functionality of hydroxyl groups and built‐in (preformed) urethane bonds. RESULTS: A facile and improved method was developed for the transformation of epoxidized soybean oil into carbonated soybean oil under ambient pressure of CO2 gas, with tetrabutylammonium bromide/calcium chloride as catalyst/co‐catalyst couple. Ring‐opening reaction of the carbonated oil with ethanolamine led to the desired polyol. A one‐pack polyurethane system was prepared via combination of the polyol and a blocked polyisocyanate. The polyol and final polyurethanes were fully characterized, and their physical, mechanical, viscoelastic and electrical insulating properties were studied. CONCLUSION: The application of this newly developed soybean oil‐based polyol for preparation of electroinsulating casting polyurethanes was examined. The prepared soy‐based polyurethanes offered excellent thermal and electrical insulating properties. Also, tunable physical and chemical properties for the final polyurethanes were achieved by replacing part of the soybean oil‐based polyol with poly(propylene glycol) (Mn = 1000 g mol−1). Copyright © 2008 Society of Chemical Industry

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Preparation and properties of one‐pack polybenzoxazine‐modified polyurethanes with improved thermal stability and electrical insulating properties

Jamshidi¹,

Yeganeh²,

Mehdipour‐Ataei³

2010

Polymer International

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A novel method has been developed for the combination of polyurethanes and polybenzoxazines. For this purpose, firstly, p‐nitrophenol blocked polyurethanes (BPUs) were prepared via the reaction of poly(tetramethylene ether) glycol of various molecular weights, 2,4‐tolylene diisocyanate and p‐nitrophenol. The BPUs were then mixed with 2,2‐bis(3,4‐dihydro‐3‐phenyl‐2H‐1,3‐benzoxazine)propane (Ba) at various weight ratios. To prepare poly(urethane‐co‐benzoxazine) networks, the BPU/Ba mixtures were subjected to a heating programme derived from detailed differential scanning calorimetry and gel content measurements. Results showed about 30 to 40 °C reduction of polymerization temperature for complete curing of BPU/Ba mixtures in comparison to neat Ba. This phenomenon was related to catalytic action of librated p‐nitrophenol molecules. The thermal, mechanical, viscoelastic and electrical properties of prepared thermoset polymers were measured and correlated with their chemical structures. A significant improvement of thermal stability and dielectric strength in comparison to neat polyurethanes was found. Also, enhancement of tensile properties, ease of curing and ability to be transformed into thin films are fascinating features of these newly developed materials in comparison to neat polybenzoxazines. Therefore, these polymers have potential applicability as high‐performance materials in modern electrical industries. Copyright © 2010 Society of Chemical Industry

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Coatings for Solderable Wires for the Modern Electric Industry

Cited by 3 publications

References 10 publications

Preparation and characterization of polyurethane electrical insulating coatings derived from novel soybean oil‐based polyol

Preparation and characterization of polyurethane electrical insulating coatings derived from novel soybean oil‐based polyol

Synthesis and properties of polyurethane networks derived from new soybean oil‐based polyol and a bulky blocked polyisocyanate

Preparation and properties of one‐pack polybenzoxazine‐modified polyurethanes with improved thermal stability and electrical insulating properties

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