Surface-modified cellulose nanofibres, bio composite resin composition and method for producing the same
AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsSanna Virtanen, Sauli Vuoti, Panu Lahtinen, Harri Setälä
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Abstract
The present invention relates to surface-modified cellulose nanofibers, which are used to improve fiber-matrix adhesion, resulting in biodegradable nanofibrillated cellulose (NFC)-polyvinyl alcohol (PVOH) composites, which can be used to form structures such as films, with excellent mechanical performance. Particularly, the present invention relates to a bio composite resin composition wherein the surface of cellulose nanofibers have been chemically modified, a method for producing such composite resin composition and a casting-sheet composite body.
Claims6
A method for producing a bio composite resin composition, wherein the method comprises the following steps:
- a) allylating cellulose fibres,
- b) epoxidising the allylated cellulose fibres to yield epoxy-cellulose dispersion(s),
- c) adding the epoxy-cellulose dispersion(s) to a thermoplastic polyvinyl alcohol resin solution(s),
- d) cross-linking the allylated and epoxidized cellulose groups and thermoplastic resin(s) by means of heating or by a catalyst or by both to obtain a reaction dispersion, and
- e) heating and mixing the reaction dispersion provided in step d),
- wherein the cellulose fibres are defibrillated prior to step a), or after step b) to obtain cellulose nanofibres (NFC fibres).
A method for producing a bio composite resin composition, wherein the method comprises the following steps:
- a) allylating cellulose fibres,
- b) epoxidising the allylated cellulose fibres to yield epoxy-cellulose dispersion(s),
- c) refining the epoxy-cellulose fibres directly in a thermoplastic polyvinyl alcohol resin with 1,6 diaminohexane and by heating the suspension,
- wherein the cellulose fibres are defibrillated prior to step a), or after step b) to obtain cellulose nanofibres (NFC fibres).
Dependencies are inferred from the claim text.