Post-crosslinking of water-borne urethanes

Coogan, Richard G.

doi:10.1016/s0300-9440(97)00010-6

Cited by 45 publications

(26 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…waterborne polyurethane, WPU) with its low volatile organic compound (VOC) levels and non-toxicity has been rapidly developed and applied [21,22]. Environmentally-friendly WPU can be applied to leather and textile finishing, floor coverings, adhesives, pressure sensitive adhesives, and so on [23][24][25][26][27]. Starch [28], soy protein [29], lignin [30], and chitin derivative [31] have been incorporated into WPU for the purposes of reducing cost, improving biodegradability, and enhancing mechanical performance.…”

mentioning

confidence: 99%

New waterborne polyurethane-based nanocomposites reinforced with low loading levels of chitin whisker

Huang¹,

Zou²,

Chang³

et al. 2011

Express Polym. Lett.

View full text Add to dashboard Cite

New waterborne polyurethane (WPU)-based nanocomposites were prepared by incorporating low loading levels of chitin whiskers (ChWs) as the nanophase. The resultant WPU/ChW nanocomposites exhibited prominent enhancement in both strength and Young's modulus, and maintained an elongation of greater than ca. 500%. The ChW loading level of 3 wt% showed the maximum tensile strength (28.8 MPa) and enhanced Young's modulus (6.5 MPa), ca.1.8- and 2.2-fold over those of neat WPU. The active surface and rigidity of ChW facilitated formation of the interface for stress transferring and contributed to higher stress-endurance. As the ChW loading level increased, self-aggregation of ChWs resulted in a decrease in strength; however, the rigidity of ChW still supported the increase in Young's modulus, and the nanocompositescontaining 5 wt% ChWs had the highest Young's modulus (9.6 MPa). This work enriches the research into achieving high mechanical performance of waterborne polyurethane-based nanocomposites by introducing a natural nanofiller, and this high performance 'green' bionanocomposites will likely have promising prospects

show abstract

mentioning

confidence: 99%

New waterborne polyurethane-based nanocomposites reinforced with low loading levels of chitin whisker

Huang¹,

Zou²,

Chang³

et al. 2011

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…The carbodiimide cross-linkers [26][27][28][29][30][31][32][33] exhibit good pot-life in aqueous systems. Mul# func# onal water dispersible polycarbodiimides display a higher performance, when used as a cross-linker.…”

Section: Pot-lifementioning

confidence: 99%

Polycarbodiimide and polyurethane cross-linkers for leather finishing

Ramkumar¹,

Murali²,

Preethi³

et al. 2017

LFJ

View full text Add to dashboard Cite

ABSTRACT. This review focuses on polyurethane and carboxylic acid-carbodiimide cross-linked systems for leather fi nishes. Recently, these cross-links have become very popular in leather fi nishing. The cross-links in leather fi nishes improve the strength proper# es of the fi nished leather, the excess of cross-links causes bri$ leness. The mul# func# onal carbodiimide cross-linkers are useful for leather surface proper# es improvement. The carbodiimide groups are sensi# ve to hydrolysis; life # me of this func# onal group during polymeriza# on is enhanced. Water dispersible isocyanates, polyurethane copolymers and polyisocyanate cross-links have applica# ons in new technologies are discussed in this review. KEY WORDS: cross-linker, polycarbodiimide, diisocyanate, leather, polyurethane AGENŢI DE RETICULARE PE BAZĂ DE POLICARBODIIMIDĂ ŞI POLIEURETAN PENTRU FINISAREA PIELIIREZUMAT. Acest ar# col se concentrează asupra sistemelor de re# culare pe bază de poliuretan şi acid carboxilic-carbodiimidă pentru fi nisarea pielii. Recent, aceste # puri de re# culări au devenit foarte populare în fi nisarea pieilor. Re# cularea pielii la fi nisare îmbunătăţeşte proprietăţile de rezistenţă ale pieii fi nite, în # mp ce excesul de legături încrucişate determină fragilitate. Agenţii de re# culare mul# funcţionali carbodiimidici sunt u# li pentru îmbunătăţirea proprietăţilor de suprafaţă ale pielii. Grupările carbodiimidice sunt sensibile la hidroliză; durata de viaţă a acestui grup funcţional în # mpul polimerizării este sporită. Re# culările cu izocianaţii dispersabili în apă, copolimerii poliuretanici şi poliizocianaţi discutate în această lucrare au aplicaţii în tehnologii noi. CUVINTE CHEIE: agent de re# culare, policarbodiimidă, diizocianat, piele, poliuretan AGENTS DE RÉTICULATION POLYCARBODIIMIDE ET POLYURÉTHANE POUR LA FINITION DU CUIRRÉSUMÉ. Cet ar# cle met l'accent sur les systèmes de ré# cula# on à base de polyuréthane et de l'acide carboxylique-carbodiimide pour la fi ni# on du cuir. Récemment, ces types de ré# cula# ons sont devenus très populaires dans la fi ni# on du cuir. La ré# cula# on du cuir dans l'opéra# on de fi ni# on améliore les propriétés de résistance du cuir fi ni, tandis que la ré# cula# on excessive entraîne une fragilité. Les agents de ré# cula# on mul# fonc# onnels de carbodiimide sont u# les pour améliorer les propriétés de surface du cuir. Les groupes carbodiimide sont sensibles à l'hydrolyse; la durée de vie de ce groupe fonc# onnel pendant la polymérisa# on est augmentée. Les ré# cula# ons avec des isocyanates dispersables dans l'eau, des copolymères de polyuréthane et des polyisocyanates décrits dans cet ar# cle ont des applica# ons dans de nouvelles technologies. MOTS CLÉS: agent de ré# cula# on, polycarbodiimide, diisocyanate, cuir, polyuréthane

show abstract

“…Economical aspect is another reason as they do not contain the expensive solvents [3]. Compared to their solvent counterparts, polyurethane dispersions can offer the following advantages: viscosity and flow properties independent of molecular weight, the absence of external emulsifiers, environmental safety, good adhesion, and rheology characteristics [4]. Other advantages which make them attractive as waterborne coatings are the outstanding properties of solvent, stain, chemical resistance, and toughness with flexibility [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoalumina on the Electrochemical and Mechanical Properties of Waterborne Polyurethane Composite Coatings

Dhoke

Rajgopalan

Khanna

2013

Journal of Nanoparticles

View full text Add to dashboard Cite

A nanocomposite coating was formed by incorporating nanoalumina pigment in a waterborne polyurethane dispersion (WPUD) to different loading levels (0.1% and 1.0% by weight). Electrochemical performance of the nanocomposite coating was evaluated by applying these nanomodified coatings on mild steel substrate and exposing them to salt-spray, humidity, and accelerated UV weathering. The surface morphology of the composite coating was evaluated using various analytical techniques. SEM and AFM were used to investigate the dispersion of nanoalumina pigment and surface morphological changes of the nanomodified coating, before and after exposure to the test environment. Mechanical properties like scratch resistance were studied by using nanoscratch technique (Nanoindenter TI-900, Hysitron Inc, USA) and hardness using pencil hardness test method. The results showed an improvement in the corrosion, UV weathering, and mechanical properties of the coatings at lower concentration (0.1% by wt), indicating the positive effect of addition of nanoalumina pigment to the coating.

show abstract

Post-crosslinking of water-borne urethanes

Cited by 45 publications

References 0 publications

New waterborne polyurethane-based nanocomposites reinforced with low loading levels of chitin whisker

New waterborne polyurethane-based nanocomposites reinforced with low loading levels of chitin whisker

Polycarbodiimide and polyurethane cross-linkers for leather finishing

Effect of Nanoalumina on the Electrochemical and Mechanical Properties of Waterborne Polyurethane Composite Coatings

Contact Info

Product

Resources

About