SciELO - Scientific Electronic Library Online

 
vol.20 número2Biocompósitos de matriz glioxal-fenol reforçada com celulose microcristalinaBiodegradação de filmes de polipropileno (PP), poli(3-hidroxibutirato) (PHB) e blenda de PP/PHB por microrganismos das águas do Rio Atibaia índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Polímeros

versão impressa ISSN 0104-1428

Resumo

MAZO, Paula; LOPEZ, Lysa; RESTREPO, David  e  RIOS, Luis. Synthesis and characterization of pressure-sensitive adhesives of waterborne polyurethane from maleinizated castor oil. Polímeros [online]. 2010, vol.20, n.2, pp.134-140.  Epub 11-Jun-2010. ISSN 0104-1428.  https://doi.org/10.1590/S0104-14282010005000022.

This work focused on the production of aqueous dispersions of polyurethane using the emulsification method by phase inversion. For the synthesis two polyols were employed, viz. a commercial polyester and Maleinizated Castor Oil (MACO), with two diisocyanates: one aromatic, toluene diisocyanate (TDI) and another aliphatic, hexamethylene diisocyanate (HDI), which are not common for this application. Citric acid was used as internal emulsifier which is inexpensive and readily available. The parameters were the amount of citric acid and the mole ratio of isocyanate groups to hydroxyl (NCO/OH), generating a 32 factorial design, with minimization of the sedimented solids. The surface methodology was used to obtain a quadratic polynomial equation by multiple regression analysis. Polyurethanes synthesized were evaluated for their mechanical and adhesive properties (tack, loop tack, hold, peel). These measurements allowed classifying the polyurethanes synthesized as repositionable adhesives, for use in labels.

Palavras-chave : Repositionable adhesives; polyurethane; dispersions; castor oil.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons