Measuring adhesion to poly(olefins) / Rose Ann Ryntz in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 921 (10/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 921 (10/2001) . - p. 107-115 Titre : Measuring adhesion to poly(olefins) : The role of adhesion promoter and substrate Type de document : texte imprimé Auteurs : Rose Ann Ryntz, Auteur ; Russ Pierce, Auteur ; Dennis M. Mihora, Auteur ; Dottie Britz, Auteur Année de publication : 2001 Article en page(s) : p. 107-115 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau  revêtement'  Peinture  Adhérence  Thermoplastique  Polyoléfine  'Industrie  automobile'  'Matière  plastique'  'Méthode  mesure'  Adjuvant Index. décimale : 667.9 Revêtements et enduits Résumé : The use of thermoplastic poly(olefins) in the automotive industry continues to proliferate due to their decreased cost and weight and increased recyclability in comparison to thermoplastics such as poly(carbonate) alloys or poly(urethanes). An attribute that continues to hamper the widespread introduction of thermoplastic poly(olefins), in particular thermoplastic olefin (TPO, a blend of impact copolymer and elastomer), into additional automotive components however is its poor surface wettability and adhesion. Adhesion promoter formulation, both in terms of resin composition and solvent variation, has been known to influence the adhesive propensity of topcoats when analyzed by typical tests such as peel strength. It has long been disputed, however, that peel strength is not a true measure of paint adhesion since it artificially introduces a film between the paint and the adhesion promoter to enable one to perform the test. In contrast, this paper discusses the use of a newly developed in-situ adhesion test, described as compressive shear delamination (CSD), to quantify the adhesive/cohesive propensity of coatings to a variety of TPO substrates. The effect of solvent type and chlorinated poly(olefin) (CPO) adhesion promoting resin on the adhesion/cohesion of topcoats to TPO is described. Chlorinated poly(olefin) type, followed by solvent variation, was shown to have the most significant impact on the adhesion/cohesion of topcoats. This newly described CSD protocol for determining the weak link in painted plastic may have a significant impact on the choice of topcoat, adhesion promoting primer formulation, and substrate in particular automotive applications. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5765 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001229	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Scratch resistance behavior of automotive plastic coatings / Rose Ann Ryntz in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 925 (02/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 925 (02/2002) . - p. 77-81 Titre : Scratch resistance behavior of automotive plastic coatings Type de document : texte imprimé Auteurs : Rose Ann Ryntz, Auteur ; Dottie Britz, Auteur Année de publication : 2002 Article en page(s) : p. 77-81 Note générale : Bibliogr. Langues : Américain (ame) Tags : Microdureté  Dureté  Etude  expérimentale  Essai  rayage  Résistance  rayure  Feuil  Propriété  mécanique  Matière  plastique  Peinture  Matériau  revêtement  Industrie  automobile Index. décimale : 667.9 Revêtements et enduits Résumé : The sensitivity of automotive coatings particularly coatings for plastics, to scratching, has been a growing concern among automakers. Scratching may result from such predelivery events as polishing of minor defects embedded in the paint, or post-delivery events such as car wash ristles, dirt embedded under a cloth utilized in polishing the car, tree branches, and the like. Warranty cannot separate out which event is the more prevalent (e.g., predelivery or post-delivery to the customer) form of damage on plastics. Data available on coatings for metal, however, does suggest thot isocyanate-based crosslinked systems perform more poorly than their melamine-based crosslinked counterparts when exposed to in-plant (predelivery) handling. This work attempts to correlate the scratch resistance behavior of hydroxyl-functional acrylic or polyester-isocyanate-functionalized carbamate-melamine-, functionalized silane-melamine-, and hydroxyl-functional acrylic or polyester-melamine-crosslinked systems, both in their green state (right out of the oven, less than one week post-cure time) and in their infancy in the field (simulated 250 kJ Xenon arc Weather-ometer), to surface attributes such as toughness, hardness, and elasticity. Known scratch methodologies, namely the crockmeter and Ford five-finger laboratory test methods, in addition to a newly described compressive shear loading device (herein termed Scratcho), are used to compare the clearcoat systems as applied over one-component hydroxyl functional acrylic or polyester melamine crosslinked black basecoats. It is shown that the scratch testing methodology utilized to assess the scratch resistance of the coating system dictates results, and that Scratcho compares very well with crockmeter results. Functional carbamate-melamine crosslinked one-component coatings and functionalized silane-melamine crosslinked one-component coatings appear to outperform selected two-component coatings, which in turn outperform one-component hydroxyl functional acrylic or polyester melamine crosslinked coatings. Material attributes such as surface hardness, toughness (as measured through the method of essential work), and the ability to recover from an applied load are most important in the ability of the coating to resist damage. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5676 [article]

Réservation

Réserver ce document

Exemplaires (2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001234	-	Périodique	Bibliothèque principale	Documentaires	Disponible
001235	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Structure/property relationships in flexible alkoxysilane automotive coatings / Phillip V. Yaneff in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 933 (10/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 933 (10/2002) . - p. 135-141 Titre : Structure/property relationships in flexible alkoxysilane automotive coatings Type de document : texte imprimé Auteurs : Phillip V. Yaneff, Auteur ; Karlis Adamsons, Auteur ; Rose Ann Ryntz, Auteur ; Dottie Britz, Auteur Année de publication : 2002 Article en page(s) : p. 135-141 Note générale : Bibliogr. Langues : Américain (ame) Tags : Silane(alcoxy)  polymère  Vieillissement  Dégradation  Essai  mécanique  Vernis  Résistance  intempérie  Contrainte  compression  Cisaillement  Indentation  rayure  Flexibilité  Feuil  Propriété  Liant  Formulation  Relation  structure  propriété  Industrie  automobile  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Flexible automotive coatings are susceptible to scratch and mar damage, especially during finishing and assembly operations. One-component (1K) flexible clearcoats exhibit very good scratch and mar resistance, but unfortunately suffer from poor durability and environmental etch resistance. Two-component clearcoats offer improvements in both etch and durability, but at the expense of scratch and mar. In this paper, the concept and properties of 1K flexibilized silane clearcoats for use on automotive plastics will be introduced and their structure/ property relationships examined as they apply to scratch and mar. The role of coating crosslink density, toughness, glass transition temperature (Tg), and surface profile on the scratch damage of coated plastic substrates will be described. In addition, a new scratch methodology, termed Scratcho, is utilized to determine relative scratch performance and is compared to conventional scratch resistance testing. Results to date indicate that hardness, as affected by the glass transition temperature, and crosslink density, as it contributes to higher essential work values, both affect resultant scratch propensityofthe flexible coatings. The relative ranking of different-coating systems employing alternate crosslinkers (e.g., isocyanate and melamine) is also presented and compared to the newly developed silane crosslinked coatings. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5620 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001244	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Understanding the effect of processing conditions on the scratch and mechanical behavior of automotive plastic coatings on TPO / Dottie Britz in COATINGS TECH, Vol. 3, N° 6 (06/2006)  

[article]  inCOATINGS TECH > Vol. 3, N° 6 (06/2006) . - p. 40-46 Titre : Understanding the effect of processing conditions on the scratch and mechanical behavior of automotive plastic coatings on TPO Type de document : texte imprimé Auteurs : Dottie Britz, Auteur ; Rose Ann Ryntz, Auteur ; Vincent Jardret, Auteur ; Phillip V. Yaneff, Auteur Année de publication : 2006 Article en page(s) : p. 40-46 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Scratching of plastic components has been a growing concern among automakers. Scratching may result from pre-delivery or post-delivery events. The coatings chemist may formulate differently for "green" properties, such as those related to pre-delivery, than for those properties resulting from aged, weathered coatings. Unfortunately, manufacturers’ warranties cannot separate out which event is the more prevalent contributor to damage of coatings on plastics. While automotive coating producers measure such properties as tensile strength, modulus, and hardness in attempts to relate these mechanical properties back to the "green" scratch resistance, little has been done to show how mechanical properties change as a function of weathering. This article attempts to correlate the scratch resistance behavior of different one-component (1K) crosslinked systems to the mechanical properties developed as a function of processing conditions and weathering. Of the parameters studied, cure temperature was found to be more critical than time at temperature, thus negating the concept of bake equivalents for coatings on plastics. In addition, it was found that for some 1K cured coatings, scratch resistance did not change significantly with the processing conditions used, while mechanical properties did, especially after accelerated weathering. En ligne : https://drive.google.com/file/d/1-GeIisRWMjVWJBaVfr1KVKmJ2DdLAo0n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5485 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
005064	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 4 / 4)