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Making adhesives tougher with weaker bonds in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 4 (04/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 4 (04/2020) . - p. 14 Titre : Making adhesives tougher with weaker bonds : Researchers have found that adding sacrificial weak bonds can improve the toughness of an adhesive system Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 14 Langues : Américain (ame) Catégories : Adhésifs dans l'industrie aérospatiale Adhésifs dans la construction Adhésifs dans les automobiles Assemblages collés Collage Colles:Adhésifs Energie Liaisons chimiques Index. décimale : 668.3 Adhésifs et produits semblables Résumé : How do you make adhesives for electronics, vehicles, and construction tougher? By making them weaker. That’s the proposed solution from a Purdue University research team. "We have been using inspiration from sea creatures to develop several new adhesives", said Jonathan Wilker, a Purdue professor of chemistry and materials engineering who helps lead the research team. "Recently we have been seeking strategies for making adhesives tougher. One way to get there can be viewed as making the materials tougher by, first, making them weaker". Note de contenu : - Creating sacrificial bonds - Commercialization opportunities - Fig. 1 : To strengthen the adhesive, the Purdue team added bonds that are broken easily throughout En ligne : https://www.adhesivesmag.com/articles/97711-making-adhesives-tougher-with-weaker [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34044 [article]

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Controlling VOC emissions from silicone-based coatings / Stephen H. Klostermeyer in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 4 (04/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 4 (04/2020) . - p. 16-19 Titre : Controlling VOC emissions from silicone-based coatings : For processes such as tape manufacturing, a recuperative thermal oxidizer specially designed for high levels of silicone may be most effective Type de document : texte imprimé Auteurs : Stephen H. Klostermeyer, Auteur Année de publication : 2020 Article en page(s) : p. 16-19 Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression Atmosphère -- Pollution -- Lutte contre Composés organiques volatils -- Oxydation Composés organiques volatils -- Toxicologie Oxydation thermique Rubans adhésifs Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Silicone-based coatings are among the most versatile materials used in a variety of industrial applications, including pressure-sensitive tapes, protective coatings, and the protection of printed text on packaging. They are chosen over other materials for their technical and mechanical characteristics, as well as their flexibility. Silicone-based coatings have excellent properties such as strong adhesion to most substrates and high chemical, thermal, UV, and water resistance. The application of these solvent, silicone-based paints, coatings, and adhesives releases significant levels of volatile organic compounds (VOCs) into the environment. When evaporated during the coating process, these VOCs react with nitrogen oxide (NOx) in the presence of sunlight to form ground-level ozone. As such, they are regulated as ozone precursors under the U.S. Environmental Protection Agency’s criteria pollution program. In sufficient quantities, VOCs can cause adverse effects on human health, including eye, nose, and throat irritations ; headaches ; dizziness ; visual disorders ; and memory impairment. The web coating and converting industry is a primary user of silicone-based coatings and is therefore faced with many challenges to control these air emissions from the manufacturing process. Web coating or converting involves applying specialized coatings over a variety of substrates or webs, including paper, foil, plastic, film, metal, and wire. The coating process consists of applying a coating material to a moving web of flexible substrate. Different types of coating lines may be found in each application, but broadly speaking, each system is based on a roll design and consists of a metering system for applying the coating material to the substrate, followed by a drying tunnel to dry the coated web before it is rewound. The coatings provide the substrate with enhanced aesthetic and physical properties derived from the coating material. Note de contenu : - Understanding thermal oxidation - Recuperative thermal oxidizers - Case study : pressure-sensitive tape manufacturer - Effective air pollution control En ligne : https://www.adhesivesmag.com/articles/97714-controlling-voc-emissions-from-silic [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34045 [article]

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Changing the packaging landscape with pressure-sensitive adhesives / Chris Blackwell in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 4 (04/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 4 (04/2020) . - p. 21-25 Titre : Changing the packaging landscape with pressure-sensitive adhesives : Adhesive manufacturers are developing new technologies that converters can present to their packaged goods customers and enable them to capture more market share Type de document : texte imprimé Auteurs : Chris Blackwell, Auteur Année de publication : 2020 Article en page(s) : p. 21-25 Langues : Américain (ame) Catégories : Adhésifs -- Emballages Adhésifs à usages médicaux Adhésifs sensibles à la pression Aliments -- Emballages Boissons Couches minces Rubans adhésifs Rubans adhésifs double face Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Pressure-sensitive adhesives (PSAs) continue to gain traction in the broad category of packaging. PSAs are rapidly changing the way goods are packaged and delivered to consumers in traditional retail and via ecommerce. They also enhance the food packaging that enables the contents to remain fresher for a longer period of time in the original container while also helping to sell those goods (and others) on the sales floor. In addition, PSAs help deliver medical devices safely and securely to medical professionals. Corrugated and cardboard/paper make up one segment of the packaging arena, and plastic the other. Adhesives in the two segments are differentiated in terms of appearance and price points. Cardboard/paper applications are typically opaque; the color and clarity of the adhesive are not an issue because consumers typically will not see it. This is the more mature marketplace of the two, with adhesives squaring off against glues. Since this means lower price points, adhesives must be economical and work well in order to be considered. The plastic marketplace typically requires clear adhesives, especially in clear packaging applications. Price points are higher in this area, as higher demands on performance and items critical to quality drive the cost. In both segments, however, adhesive manufacturers that can develop new technologies are providing solutions that converters can present to their packaged goods customers and enable them to capture more market share. Note de contenu : - Changing the game for ecommerce - Faster packaging using the same package - Adding style and sustainability to wine boxes - Ringing up sales for retail - Feeding the need for food freshness and sustainability - Maintaining the integrity of medical goods and devices - Ensuring safety and compliance - A bright future - Fig. 1 : Double-coated PEt tapes play a role in helping online retailers meet consumer expectations for shipping carton seals - Fig. 2 : Pre-adhered tape constructions for point-of purchase displays eliminate the need for fasteners and tabs - Fig. 3 : PSAs provide a secure seal for the bubble of plastic that encloses medical devices and allows a fast peel for medical professionals to access the devices when needed En ligne : https://www.adhesivesmag.com/articles/97658-changing-the-packaging-landscape-wit [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34046 [article]

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How do stabilizers improve durability ? in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 4 (04/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 4 (04/2020) . - p. 26-30 Titre : How do stabilizers improve durability ? : Raw materials in adhesives and sealants formulations are often protected from degradation by suitable stabilizer packages or through appropriate packaging Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 26-30 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs Antioxydants Colles:Adhésifs Mastics Stabilisant à la lumière de type amine encombrée Stabilisants (chimie) Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Stabilizing additives such as antioxidants (AOs), ultraviolet (UV) absorbers, and hindered amine light stabilizers enable formulators to create durable adhesives and sealants, thereby extending the life of adhesively bonded goods. These high-performance products are key contributors to sustainable product development and help to promote the advancement of a circular economy. Although often invisible, adhesives and sealants are part of our daily lives. They ensure that our food is packaged and advertised safely, that our houses are wind- and waterproof, and that our communication and mobility needs are served in safe and efficient ways. Thousands of everyday items such as mobile phones, washing machines, personal hygiene products, shoes, clothing, building products, batteries, automobiles, rail cars, ships, and airplanes are nowadays only practical due to the use of high-performing adhesives and sealants. A broad range of chemistries and polymeric organic materials is required to cover the multitude of adhesive and sealant bonding parameters. Adhesive formulators have taken on the challenge and created the art of matching bonding performance requirements with products and application processes. Their core expertise lies in selecting chemistries, curing mechanisms, and raw materials and combining them to create a product that can be processed efficiently and economically in the respective application environment. Polymers and organic materials have an inherent tendency to change properties and degrade throughout their value chain—from manufacturing, processing, transportation, and storage right to end use. Note de contenu : - Incorporation and processing - Enabling high-performance formulations - Fig. 1 : Overview of degradation causes and stabilization effects along the value chain - Fig. 2 : Protection effects of antioxidants (AOs), UV absorbers (UVSs), and hindered amine light stabilizers (HALS) - Table 1 : Typical structures En ligne : https://www.adhesivesmag.com/articles/97681-how-do-stabilizers-improve-durabilit [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34047 [article]

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Polyurethane adhesive for untreated polypropylene / Yoshihiko Shiraki in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 4 (04/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 4 (04/2020) . - p. 32-37 Titre : Polyurethane adhesive for untreated polypropylene : A new polyurethane-based adhesive has been developed to address adhesion challenges associated with bonding untreated polypropylene Type de document : texte imprimé Auteurs : Yoshihiko Shiraki, Auteur ; Tadayuki Kawaguchi, Auteur ; Takaki Jono, Auteur Année de publication : 2020 Article en page(s) : p. 32-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs dans les automobiles Adhésion Angle de contact Assemblages collés Energie de surface Matières plastiques dans les automobiles Polypropylène Polyuréthanes Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Adhesives incorporating polyurethane resin have been widely used in industry due to many desirable characteristics, such as a high adhesive property, chemical resistance, and flexibility. For example, these adhesives are used in the automotive industry, in both interior and exterior applications such as car body assembly, synthetic leather door panels, and center consoles. Polypropylene (PP) is also commonly used as an important material due to its useful properties, including high chemical resistance and good heat resistance, as well as low specific gravity. In fact, PP is the most consumed engineering plastic for interior vehicle parts, finding applications in dashboards, door panels, sidewalls, roof linings, center consoles, break and accelerator pedals, and air bags. As a result, PP contributes to the reduction of car body weight and raw materials costs. Note de contenu : - Fig. 1 : Sketch of test piece - Fig. 2 : Zisman plot of HPO-MDI PUs and PP - Table 1 : HPO-MDI polyurethane properties - Table 2 : Contact angle of each probe liquide - Table 3 : Surface free energy of each HPO-MDI and PP - Table 4 : Adhesive strength of each HPO-MDI PU and PP at 80°C post-heat treatment conditions - Table 5 : Adhesive strength of HPO-MDI PU1 and PP at various post-heat treatment temperature conditions En ligne : https://www.adhesivesmag.com/articles/97665-polyurethane-adhesive-for-untreated- [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34048 [article]

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Elastic strand bonding without the use of end-block resins / Paul Dalley in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 4 (04/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 4 (04/2020) . - p. 38-39 Titre : Elastic strand bonding without the use of end-block resins : Styrene-isoprene-styrene polymers can be used to eliminate the need for end-block resins in elastic laminate bonding applications Type de document : texte imprimé Auteurs : Paul Dalley, Auteur Année de publication : 2020 Article en page(s) : p. 38-39 Langues : Américain (ame) Catégories : Adhésifs thermofusibles Assemblages collés Collage Copolymère styrène isoprène styrène Formulation (Génie chimique) Stratifiés Index. décimale : 668.3 Adhésifs et produits semblables Résumé : It is common in the hygiene industry to make elastic laminates by bonding elastic strands using an adhesive. The laminate comprises a layer of non-woven, elastic strands, and a polypropylene back sheet. These three components are held together using an adhesive. Many kinds of adhesives are viable, but hot-melt adhesives are typically used and those based on styrenic block copolymers are favored. Of the types of block copolymers available, styrene-isoprene-styrene (SIS) block copolymers are preferred. An elastic strand bonding adhesive is typically formulated with several co-ingredients. Along with the polymer, it’s common to add a resin, an oil, an antioxidant, and optionally a wax. Moreover, the resin portion of the formula may consist of two different types of resin. One resin typically is soluble in mid-block, and the second resin is typically soluble in the end block. The mid-block resin provides tack and adhesion, while the end-block resin raises the modulus of the adhesive to make the bond stronger. Note de contenu : - Fig. 1 : Styrenic block copolymer structures - Fig. 2 : Initial creep (%) - Fig. 3 : Aged creep results (%) - Table 1 : Adhesive formulae for elastic strand bonding (% wt/wt) - Table 2 : SIS polymer properties En ligne : https://www.adhesivesmag.com/articles/97698-elastic-strand-bonding-without-the-u [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34049 [article]

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Real-time monitoring of adhesive and sealant properties in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 4 (04/2020)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 4 (04/2020) . - p. 40-45 Titre : Real-time monitoring of adhesive and sealant properties : The correct adjustment of flow characteristics of sealants and thermosetting adhesives is crucial to their performance in automated, high-speed production environments Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 40-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automatisation Colles:Adhésifs Epoxydes Essais (technologie) Films plastiques Mastics Rhéologie Stratifiés Thermodurcissables Viscosité Index. décimale : 668.3 Adhésifs et produits semblables Résumé : The automated application of sealants and adhesives in settings such as automotive production requires that predictable, reproducible quantities are applied, and that they flow properly and remain in place during the final setting period. In the printing industry, lamination of plastic films is done on specialized high-speed machines that require close control of adhesive viscosity. Resins that are applied to fiber textiles and mats to make composite prepregs require exact staging of the matrix resin. Note de contenu : - Rheometers vs. viscometers - Inline viscosity monitoring - Monitoring cure in batch-mixed adhesives - Potential applications - Fig. 1 : Inline viscometer and installed in a flowline adapter for inline applications - Fig. 2 : Adhesive reservoir in a high-speed laminating machine - Fig. 3 : A device currently in testing is based on a viscosity sensor with a luer taper on its tip to enable the connection of a conventional disposable dosing needle to extend its sensitive element - Fig. 4 : Curing curves of a fast-curing consumer epoxy adhesive. The plot shows the damping and frequency of the instrument with the adhesive's liquid, gelled, and solid-cured phases - Fig. 5 : Curing curves of a slow-curing epoxy laminating resin with hardener in a 100:30 weight ratio. The plot shows the resin's liquid, gelled, and solid-cured phases En ligne : https://www.adhesivesmag.com/articles/97688-real-time-monitoring-of-adhesive-and [...] Format de la ressource électronique : Html Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34050 [article]

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Adhesives & sealants industry (ASI) Vol. 27, N° 4 URL