Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
New Formaldehyde and Isocyanate Free Adhesive Systems: Evaluation of Curing Process and Mechanical Properties
KTH, School of Chemical Science and Engineering (CHE).
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Nytt formaldehyd- och isocyanatfritt limsystem : Utvärdering av härdningsprocess och mekaniska egenskaper (Swedish)
Abstract [en]

Two important raw materials in adhesives are isocyanate and formaldehyde. In high concentrations these chemicals cause safety and health problems during manufacturing and gluing application. Therefore, the demand for development of formaldehyde- and isocyanate free chemistries and methods have increased. Previous methods showed that formaldehyde and  isocyanate free (FIF) systems  can  be obtained  through reacting xxx with xxx,  to avoid XXX  XXX  groups. The main reactions for XXX  XXX are XXX  XXX  XXX,  which leads to XXX.

In this project, formaldehyde and isocyanate free, FIF, adhesive systems with suitable curing catalyst were evaluated for xxx xxx xxx xxx. Pure and formulated systems were investigated through three various bonding tests, according to industry testing standards. Further, comparison with approved and commercially used xxx (xxx) systems was performed. In addition, performance regarding curing, pot life and storage life were evaluated for  the systems with viscometer, rheometer, FT-IR and NMR.

Evaluations of the systems showed that formulations with the tested xxx xxx and xxx improved the tensile shear strength compared to pure systems. It also showed that higher degree of xxx gave higher strength result. However, it could be seen that formulations containing resin and the tested xxx xxx did not improve the tensile strength compared to the pure systems. Furthermore, the addition of xxx was also shown to improve the  water resistance compared to the pure system. There were also indications that formulations that were evaluated during higher heat conditions obtained improved tensile shear strength compared to cold conditions. For formulations with the tested xxx xxx it was discovered that the resins and the xxx were not compatible with each other. Furthermore, the resins and xxx had significantly xxx xxx xxx, which complicated the xxx process. By addition of the tested xxx xxx the compatibility could be improved. None of the formulated systems  obtained tensile shear strengths comparable to the xxx systems. However, it was shown that the formulated systems of xxx reached higher tensile shear strength than the pure resins.

From the curing evaluations, it could be seen that it was possible to regulate  the  curing process to some extent. By varying the catalyst concentration and resin to catalyst ratio it was possible to control the rate of the xxx, which altered the time until the xxx affected the viscosity. Additionally, it was discovered that xxx xxx were harder to regulate than xxx xxx. From the rheometry measurements and the FT-IR analysis it could be seen that the hardening processes could be correlated. The storage samples showed that the viscosity was increasing for all the tested formulations over time, which indicate onset of xxx and/or xxx xxx  xxx. From the NMR analysis, of one of the stored samples, the xxx xx xxx could be confirmed.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Adhesive, formaldehyde and isocyanate free systems, mechanical properties, cunng process
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-212986OAI: oai:DiVA.org:kth-212986DiVA, id: diva2:1136125
External cooperation
AkzoNobel
Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2017-08-25Bibliographically approved

Open Access in DiVA

No full text in DiVA

By organisation
School of Chemical Science and Engineering (CHE)
Polymer Technologies

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 41 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf