Oct 22, 2020   10:47 p.m. Sergej
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Ing. Anton Lisý
Identification number: 61256
University e-mail: anton.lisy [at] stuba.sk
 
2811V02  Technology of Polymer Materials D-TPOLMI
FCFT D-TPOLMI den [year 3]
Doctoral type of study, full-time, attendance method form
3rd year of study

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Final thesis     Projects
     
     

Basic information

Basic information about a final thesis

Type of thesis:
Diploma thesis
Thesis title:
Preparation and application of lignin for partial or complete replacement of polyvinyl acetate based adhesive
Written by (author):
Ing. Anton Lisý
Department: Department of Wood, Pulp and Paper (IPM FCFT)
Thesis supervisor: Ing. Aleš Ház, PhD.
Opponent:
Final thesis progress:
Final thesis was successfully defended.


Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:Slovak

Slovak        English

Title of the thesis:
Preparation and application of lignin for partial or complete replacement of polyvinyl acetate based adhesive
Summary:
Aim of this thesis was to precipitate lignin from black liquors, and looking for suitable conditions of precipitation. Subsequently, the precipitated lignin was meant to be used as replacement, additive or filler to glue of polyvinyl acetate basis used in veneer bonding. In theoretical introduction to problematic, thesis briefly address subjects of lignin, its isolation and use, as well as production of wood composites, glues, and potential of replacing them with lignin. Experimental part is separated into precipitation of lignin and amelioration of its properties as well as its characterization and use of this lignin in veneer bonding. To precipitate lignin sulphuric, nitric, acetic and hydrochloric acids were used. Best properties were observed at lignin precipitated by sulphuric acid. Lignin used in thesis was also modified by purification in an effort to lower ash content and acetylation, in effort of improving compatibility with PVAc glue. Pressing and bonding of veneers was realized at heated press, in temperatures range from 50 to 140°C, pressure 1,51 N/mm2 during 5 minutes. Next step was testing of bonds in tensile and shear strength. Testing was realized by norm STN EN 314-1. Shear strength in bond was stronger, that one in wood veneer and thus we were no able to determine exact shear strengths. Results of tensile strengths were depending upon used temperature, lignin and its amount added to mixture. As suitable addition for technological use was 5% addition of lignin to glue mixture at pressing temperature less than 80°C, meanwhile addition of 15% lignin isolated from black liquor of deciduous woody plants has to be made at pressing temperature of 140°C. At these conditions, observed tensile strengths increased by 50 to 70%, compared to pure PVAc glue at same conditions. Highest observed tensile strength was 7,78 N/mm2 . From measured data we can assume that addition of lignin to PVAc glues may lead to improvement in strengths if processing conditions are set properly. This may lead to increased use of PVAc glue in plywood manufacturing.
Key words:
lignin, wood composites, glue, polyvinyl acetate

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