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Synthesis and characterization of water-thinnable thermosetting acrylic resins for low-cure surface coatings in PAINTINDIA, Vol. LVIII, N° 1 (01/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 1 (01/2008) . - p. 67-74 Titre : Synthesis and characterization of water-thinnable thermosetting acrylic resins for low-cure surface coatings Type de document : texte imprimé Année de publication : 2008 Article en page(s) : p. 67-74 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basses températures Caractérisation Copolymères Polyacryliques Polymères -- Synthèse Revêtements:Peinture Thermodurcissables Index. décimale : 667.9 Revêtements et enduits Résumé : Among the various binders used for industrial finishes, thermosetting acrylics (TSAs) are gaining importance. There are two main reasons for this ; firstly they possess inherently superior properties ; such as water clear appearance, colour retention, good durability, low pigment reactivity, excellent chemical resistance and excellent flexibility. Secondly, thermosetting acrylics provide greater formulation latitude as they can be tailor made to suit specific applications. Presently, thermosetting acrylics are commonly used in the two major forms: (a) Solvent soluble thermosetting acrylics for conventional solids coatings. (b) Thermosetting acrylics for high solids coatings. . In the present work, water-thinnable acrylic resins have been developed wherein water is used in place of volatile organic solvent which is the main source of VOC emission. Water-thinnable thermosetting acrylics are getting more prominence day after day because of their eco-friendly nature, cost effectiveness and superior films performance. However, ordinary water-thinnable thermosetting acrylic resins cure at high temperature (≈120-150°C) and hence involve high energy consumption. Through this work, efforts have also been directed towards developing such water-thinnable thermosetting acrylic resins which can be cured at lower temperature to yield low-cure surface coatings. For achieving this, a series of TSA resins were prepared by reacting 2-hydroxy ethyl methacrylate (HEMA) and acrylic acid (AA) as monomers in butanol as solvent in presence of benzoyl peroxide as initiator. The prepared TSA resins were made water soluble by neutralizing with ammonia solution. The coating films-were then baked at 90°C for 30 minutes to effect film cure. Cured films were evaluated for their various optical, mechanical and chemical resistance properties to ascertain the commercial utility of low-temperature curable water-thinnable TSA resins. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Analysis - Preparation of coating films and their curing - RESULTS & DISCUSSION : IR-spectra - evaluation of film properties - Mechanical properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12091 [article]

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Cool interiors in hot summer days : Application of infrared reflecting coatings / Indrajit Banerjee in PAINTINDIA, Vol. LVIII, N° 1 (01/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 1 (01/2008) . - p. 89-94 Titre : Cool interiors in hot summer days : Application of infrared reflecting coatings Type de document : texte imprimé Auteurs : Indrajit Banerjee, Auteur Année de publication : 2008 Article en page(s) : p. 89-94 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Pigments inorganiques Rayonnement infrarouge Réflectivité thermique Index. décimale : 667.2 Colorants et pigments Résumé : In tropical countries, during the hot summer days, as the surrounding temperature rises the solar heat absorbed by the walls of buildings is conducted into the interiors making them uncomfortable to live. Ordinary paints, apart from whites, do not have the capacity to protect the substrate from heat accumulation and consequent conduction. However a new generation coating system formulated with Complex Inorganic Colour Pigments (CICP) actually cut-off this heat. They are infrared reflecting pigments and can reflect IR radiation incident on them to a great extent. Room temperature of buildings whose exteriors are coated with these paints is found to be lower by 40-60. This saves energy (in form of air-conditioner bills). The foregoing paper discussed in brief the principle of heat reflection by these CICPs, their usage and method of evaluating the same. Note de contenu : - Infrared reflecting coatings - Advantages : IR reflecting coating benefits (general benefits, roofing benefits) - Infrared reflecting pigments - Evaluating infrared reflecting pigments - Handling of IRR pigments : Dispersion - Blending - Role of substrate in IRR coating's performance. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12101 [article]

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Dispersing technology / Manoj Sathyan in PAINTINDIA, Vol. LVIII, N° 1 (01/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 1 (01/2008) . - p. 95-128 Titre : Dispersing technology Type de document : texte imprimé Auteurs : Manoj Sathyan, Auteur Année de publication : 2008 Article en page(s) : p. 95-128 Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Couleurs -- Stabilité Dispersions et suspensions Floculation Noir de carbone Pigments Stabilisants (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : Coating is a complex subject if formulators want to formulate defects free and yet obtain the best stable performance coating. The most complex part of coating is the wetting and dispersing of stabilizing solid particles in the system. Thus, dispersion of solid in liquids involveds extensive colloid chemistry in order for us to understand how these particles can be wetted, dispersed and eventually stabilized. Stabilization of pigments is the most important factor in coating to ensure a well dispersed pigmented coating. Below are the definitions for wetting, dispersing as well as stabilization in relation to coating. Note de contenu : Wetting - Dispersing - Stabilization - AGGLOMERATION, AGGREGATES AND FLOCCULATION : Flocculation forces - WAYS TO DO STABILIZATION : Pigments pre-treatment - Dispersing resins - Resins in the system - Dispersant as additives - BASIC DISPERSANT CRITERIA : Compatibility - Low surface tension - Pigment affinity group, anchoring group - DISPERSANT ADDITIVES AND THEIR HISTORY : Conventional wetting and dispersing agent - High molecular weight dispersants - TEST METHODS FOR OPTIMAL STABILITY BY DISPERSING AGENT : Rub out test - Pour out test - PROBLEMS RELATED TO POOR STABILIZATION : Poor color strength/tinging strength - Color stability - Flooding and floating - Synaeresis - Poor gloss/loss of gloss - Transparency of organic pigment and carbon black - Leveling and flow - Influence of other factors toward the efficiency of dispersants - Compatibility - Amount of milling resins- Milling viscosity Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12102 [article]

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Waterborne resins technology for industrial coatings / Ad Van den Elshout in PAINTINDIA, Vol. LVIII, N° 1 (01/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 1 (01/2008) . - p. 132-150 Titre : Waterborne resins technology for industrial coatings Type de document : texte imprimé Auteurs : Ad Van den Elshout, Auteur Année de publication : 2008 Article en page(s) : p. 132-150 Langues : Anglais (eng) Catégories : Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Note de contenu : - Industrial coating segmentation - Position of WB industrial wood technology in Europe - Wood coating segmentation - Sub segments industrial wood - Trends - Specific area directed - Technologies to replace - Development need - Technology choice - Wood wetting/wood warmening - Self-crosslinking emulsions - Sequential polymerization - Surfactant free polymers - Surfactant free chemistry - Fatty acid modification - Water based UV-curing - Products - Combination of technologies - Special types - Self cross-linking emulsions - Resistance 2-component WB - Acrylic copolymers 30 % gloss - Hydroxy acrylic emulsions - NeoCryl XK-102 tests results - NeoPac E-160 - Urethane acrylic co-polymer - NeoPac E-160 - FA-modified dispersions - Colloidal acrylic emulsions - Metal coatings - Trends - Metal sub segments for water based - Technology selection - Salt spray resistance - Outdoor durability - NeoCryl XK-87 - NeoCryl XK-87 formulation D-2120 - Haloflex - Haloflex "water based chlorinated rubber" - Rust converters - Atrust - Rust converters - plastic coatings - NeoCryl A-667 - Film formation - MFT Curve - Film formation Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12103 [article]

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