Crystallization behavior of stable urea formaldehyde resin dispersed by polyvinyl alcohol

2014 ◽  
Vol 24 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Yunfei Zhang ◽  
Chenghua Yang ◽  
Jian Zheng ◽  
Mangeng Lu
Keyword(s):  
Polyvinyl Alcohol ◽  
Crystallization Behavior ◽  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin

Study on Urea-Formaldehyde Resin for Glass Wool Products

2013 ◽  
Vol 774-776 ◽  
pp. 1232-1236
Author(s):  
Nan Zhe Zhang
Keyword(s):  
Polyvinyl Alcohol ◽  
Water Resistance ◽  
Urea Formaldehyde ◽  
Glass Wool ◽  
Orthogonal Test ◽  
Urea Formaldehyde Resin ◽  
Molar Ratio ◽  
Formaldehyde Resin ◽  
Resin Adhesive ◽  
Uf Resin

In order to prepare urea-formaldehyde (UF) resin adhesive with good performance for glass wool products, we used polyvinyl alcohol (PVA), p-toluenesulfonamide (PTSA) and methanol to modify UF resin, optimized the molar ratio of formaldehyde (F) / urea (U) and reaction components ratio by orthogonal test, reduced the content of free formaldehyde in UF resin, and enhanced the water resistance, flexibility and stability of UF resin.

Synthesis of Wood Lignin-Urea-Formaldehyde Resin Adhesive

2012 ◽  
Vol 560-561 ◽  
pp. 242-246 ◽  
Author(s):  
Zhe Wang ◽  
Jing Wen Xue ◽  
Jian Bo Qu ◽  
Wen Xia Liu
Keyword(s):  
Polyvinyl Alcohol ◽  
Lignin Content ◽  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Formaldehyde Content ◽  
Binding Strength ◽  
Resin Adhesive ◽  
Alkali Lignin

Lignin-urea-formaldehyde resin adhesive was synthesized with alkali lignin from gramineae waste pulping liquor. Alkali lignin was purified and hydroxymethylated with HCHO and then crosslinked with urea-formaldehyde resin, polyvinyl alcohol and melamine. Results showed that lignin content in purified alkali lignin was 86.91%, both binding strength and free HCHO content of urea-formaldehyde resin synthesized from hydroxymethylated lignin reached the optimum value. The proper lignin amount for preparing resin was 30%, and the binding strength at this condition was 4.56MPa, and free formaldehyde content was 0.049%.

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

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

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

RSC Advances ◽  
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.

Effect of spent sulfite liquor on urea-formaldehyde resin performance

2018 ◽  
Vol 136 (17) ◽  
pp. 47389 ◽  
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

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

2013 ◽  
Vol 815 ◽  
pp. 367-370 ◽  
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.

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