Effect of microfibrillated cellulose addition on thermal properties of three grades of urea-formaldehyde resin

Abstract Urea formaldehyde (UF) resins are brittle and to improve their tensile properties poly(vinyl alcohol) (PVA) has been used to modify the UF resin. An easy improved procedure was developed to make PVA modified UF resin on the basis of conventional synthesis of UF resin. Prepolymer of UF was mixed with different weight percentages of PVA (1-5%) to synthesize modified UF resin which can be used to make adhesive for forest products. Both UF and modified UF resins were characterized by FTIR, physico-mechanical and thermal properties analyses. Modified UF resin containing 2 wt. % PVA exhibited better results than the UF.

Download Full-text

Effects of Three Biomass Fillers on the Properties of Melamine Modified Urea-Formaldehyde Resin

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/782/2/022077 ◽

2020 ◽

Vol 782 ◽

pp. 022077

Author(s):

Shanfeng Xu ◽

Sanshan Xia ◽

Yuzhu Chen ◽

Hui Xiao ◽

Maoyu Yi ◽

...

Keyword(s):

Urea Formaldehyde ◽

Urea Formaldehyde Resin ◽

Formaldehyde Resin ◽

Modified Urea

Download Full-text

Calcium carbonate modified urea–formaldehyde resin adhesive for strength enhanced medium density fiberboard production

RSC Advances ◽

10.1039/d1ra04316a ◽

2021 ◽

Vol 11 (40) ◽

pp. 25010-25017

Author(s):

Li Lu ◽

Yan Wang ◽

Tianhua Li ◽

Supeng Wang ◽

Shoulu Yang ◽

...

Keyword(s):

Calcium Carbonate ◽

Urea Formaldehyde ◽

Medium Density Fiberboard ◽

Urea Formaldehyde Resin ◽

Formaldehyde Resin ◽

Medium Density ◽

Ionic Bond ◽

Resin Adhesive ◽

Uf Resin ◽

Modified Urea

Reactions between CaCO3 and CH2O2 during polycondensation of UF resin produce Ca2+. Ionic bond complexation binds Ca2+ with UF resin. The UF resin crystalline percentage decreases from 26.86% to 22.71%. IB strength of resin bonded fiberboard increases from 0.75 to 0.94 MPa.

Download Full-text

Effect of spent sulfite liquor on urea-formaldehyde resin performance

Journal of Applied Polymer Science ◽

10.1002/app.47389 ◽

2018 ◽

Vol 136 (17) ◽

pp. 47389 ◽

Cited By ~ 1

Author(s):

Ana Maria Ferreira ◽

João Pereira ◽

Margarida Almeida ◽

João Ferra ◽

Nádia Paiva ◽

...

Keyword(s):

Urea Formaldehyde ◽

Urea Formaldehyde Resin ◽

Formaldehyde Resin ◽

Spent Sulfite Liquor

Download Full-text

Preparation and Characterization of Hexadecane Microcapsule Phase Change Materials by In Situ Polymerization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.815.367 ◽

2013 ◽

Vol 815 ◽

pp. 367-370 ◽

Cited By ~ 4

Author(s):

Xiao Qiu Song ◽

Yue Xia Li ◽

Jing Wen Wang

Keyword(s):

Particle Size ◽

Phase Change ◽

Phase Change Materials ◽

In Situ Polymerization ◽

Urea Formaldehyde ◽

Agitation Speed ◽

Urea Formaldehyde Resin ◽

Formaldehyde Resin ◽

Mass Ratio

Hexadecane microcapsule phase change materials were prepared by the in-situ polymerization method using hexadecane as core materials, urea-formaldehyde resin and urea-formaldehyde resin modified with melamine as shell materials respectively. Effect of melamine on the properties of microcapsules was studied by FTIR, biomicroscopy (UBM), TGA and HPLC. The influences of system concentration, agitation speed and mass ratio of wall to core were also investigated. The results indicated that hexadecane was successfully coated by the two types of shell materials. The addition of melamine into the urea-formaldehyde resin microcapsule reduced microcapsule particle size and microencapsulation efficiency. The influences of factors such as system concentration, agitation speed and mass ratio of wall to core to different wall materials microcapsules presented different variety trends of the microcapsule particle size.

Download Full-text