Interactions between light stabilizers and pigment particles in polymeric coatings

Haacke, G.; Longordo, E.; Andrawes, Fikry F.; Campbell, B. H.

doi:10.1016/s0300-9440(97)00119-7

Cited by 17 publications

(12 citation statements)

References 11 publications

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“…Acid/base interactions and van der Waals forces are considered to be responsible. 2 Covalent bonding (chemisorption) is assumed to be dominating in contact with carbon-black surfaces. 1 As a consequence, a part of HAS (even monomeric) is present in a non-extractable form, fully hindering any migration.…”

Section: Uv Stabilizers and Other Components Of Formulationsmentioning

confidence: 99%

“…5 Adsorption isotherms were determined for UV absorbers and hindered amine light stabilizers compounds used in coatings. 2 HAS monomeric stabilizers (Hostavin 3058, Tinuvin 123, 292, 770) were studied. UV absorbers under study included: benzotriazole (Cyasorb UV-2337, Tinuvin 384 and 1130) and triazine (Cyasorb UV-1164) stabilizers.…”

Section: Uv Stabilizers and Other Components Of Formulationsmentioning

confidence: 99%

“…UV absorbers under study included: benzotriazole (Cyasorb UV-2337, Tinuvin 384 and 1130) and triazine (Cyasorb UV-1164) stabilizers. 2 Pigments and fillers included carbon black, titanium dioxide, and several inorganic and organic pigments. Carbon black was the most absorbing filler.…”

Section: Uv Stabilizers and Other Components Of Formulationsmentioning

confidence: 99%

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Uv Stabilizers and Other Components of Formulations

2015

Handbook of UV Degradation and Stabilization

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Section: Uv Stabilizers and Other Components Of Formulationsmentioning

confidence: 99%

Section: Uv Stabilizers and Other Components Of Formulationsmentioning

confidence: 99%

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Uv Stabilizers and Other Components of Formulations

2015

Handbook of UV Degradation and Stabilization

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“…24 The degree of chemisorption is a function of the HALS basicity as well as the nature of the pigment, that is, the surface charge. 25 Today, most of the pigments used in 26 For an efficient and economic use of HALS in pigmented coatings, the knowledge about possible interactions is key. To learn more about HALS and pigment interactions, a systematic study was made together with the company Kronos International.…”

Section: How To Get Best Uva/hals Synergismmentioning

confidence: 99%

Hindered amine light stabilizers in pigmented coatings

2008

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It is common practice to combine hindered amine light stabilizers (HALS) with UV absorbers (UVA) for optimal protection of coatings and plastics. The ratio of UVA and HALS strongly depends on the concentration of pigments (acting as UVA) used in the paint; that is, a clearcoatings require higher amounts of UVA, whereas opaque pigmented coatings require higher amounts of HALS. Here, especially basic HALS types can interfere with paint components like, for example, pigments due to acid/base interactions. In this article, we want to discuss the influence of HALS basicity on long-term performance in opaque white pigmented solventborne (SB) and waterborne (WB) coatings for industrial applications in correlation to the quality of the used TiO 2 .

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“…There is a danger of surface adsorption of basic HAS [NH, [NCH 3 , or [NO . on silica gel (van der Waals forces are considered to be responsible) [40]. Covalent bonding (chemisorption) is assumed to be dominating in contact with carbon-black surfaces.…”

Section: Has In Contact With Fillers and Colorantsmentioning

confidence: 99%

Exploitation of the complex chemistry of hindered amine stabilizers in effective plastics stabilization

Pospı́šil

Pilař

Nešpůrek

2007

Vinyl Additive Technology

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Hindered amine stabilizers (HAS) remain a prominent class of stabilizers having a fortunate development with continuous interest in shaping the future properties of plastics: increase in polymer durability, application extension, reaching new effects. Commercial tests provided much information. Insufficient mechanistic interpretations of the complex effects of environmental factors (harshness of testing, penetration of radiation and oxygen, superposition of temperature, atmospheric impurities) and those of the microenvironment (morphology of the polymer matrix, physical relations of HAS-polymer, interference between HAS and other additives) are a drawback. Model experiments complement commercial studies and explain some phenomena. A careful transfer of information from model experiments must be done to avoid misinterpretation of mechanisms, particularly of the HAS regenerative cycle. A critical analysis of primary steps of the HAS activity mechanism in the polymer matrix based on HAS-related primary nitroxides, formation of their stationary concentration and concentration gradients influenced by polymer morphology, spatial competition between autoreactions, and oxidation of polymerdeveloped alkyl radicals and their scavenging by nitroxides (the key process of HAS efficiency) is outlined. Cyclic regeneration of nitroxides affected by the structure of the amino moiety in the HAS molecule, influence of acid environment, atmospheric ozone or singlet oxygen, cooperative mixtures of HAS with UV absorbers, combinations with additives increasing the thermal stabilization effect and improving color retention, assessment of the heat stabilization performance of HAS by proper testing, and influence of the molecular weight of HAS are mentioned together with examples of the chemical consumption of HAS in the final phases of their lifetime.

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Interactions between light stabilizers and pigment particles in polymeric coatings

Cited by 17 publications

References 11 publications

Uv Stabilizers and Other Components of Formulations

Uv Stabilizers and Other Components of Formulations

Hindered amine light stabilizers in pigmented coatings

Exploitation of the complex chemistry of hindered amine stabilizers in effective plastics stabilization

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