Crosslinking reaction and properties of two-component waterborne polyurethane from terpene-maleic ester type epoxy resin

2012 ◽  
Vol 128 (1) ◽  
pp. 132-138 ◽  
Author(s):  
Guo-min Wu ◽  
Zhen-wu Kong ◽  
Cai-feng Chen ◽  
Jian Chen ◽  
Shu-ping Huo ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Waterborne Polyurethane ◽  
Crosslinking Reaction ◽  
Two Component

scholarly journals Preparation and Properties of Autocatalytic Biobased Waterborne Polyol from Rosin Based Epoxy Resin

2022 ◽  
Author(s):  
Guomin Wu ◽  
Jian Chen ◽  
Zhaozhe Yang ◽  
Can Jin ◽  
Guifeng Liu ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Tertiary Amine ◽  
Reaction Rate ◽  
Waterborne Polyurethane ◽  
Crosslinking Reaction ◽  
Forming Process ◽  
Waterborne Coatings ◽  
Ft Ir ◽  
Amine Groups ◽  
Heterogeneous Film

Abstract Due to the complex heterogeneous film forming process of two-component waterborne polyurethane (2K-WPU), the crosslinking reaction rate of 2K-WPU cannot meet the demand of efficient application in coatings. In order to improve the crosslinking reaction rate of 2K-WPU, a waterborne polyol containing tertiary amine groups was synthesized from rosin based epoxy resin and secondary amine compound, and then autocatalytic 2K-WPU was prepared by crosslinking the rosin based waterborne amino polyol with polyisocyanate. The structure of the polyol from rosin based epoxy resin was characterized with Fourier infrared (FT-IR) and nuclear magnetic resonance (NMR). The crosslinking kinetics and the crosslinked product of the rosin based waterborne amino polyol were also compared with a commercial acrylic polyol. It was shown from the results that the crosslinking reaction rate of the rosin based waterborne amino polyol was faster than that of the commercial acrylic polyol, which indicated the tertiary amine groups chemically bonded in the rosin based polyols could autocatalyze the crosslinking reaction of 2K-WPUs with catalysts free. The film of the rosin based waterborne amino polyol had excellent impact strength, adhesion, flexibility, hardness, gloss, fullness and solvent resistance, showing a good application prospect in the field of waterborne coatings.

scholarly journals The optical shielding performances and mechanisms of green flame-retardant two-component matte films under various application conditions

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12696-12702
Author(s):  
Xuan Yin ◽  
Yunjun Luo
Keyword(s):  
Flame Retardant ◽  
Waterborne Polyurethane ◽  
Two Component

Herein, we meticulously investigated the optical shielding performances and mechanisms of green flame-retardant two-component waterborne polyurethane matte films based on a previous study.

scholarly journals Study of the Effect of PGDA Solvent on Film Formation and Curing Process of Two-Component Waterborne Polyurethane Coatings by FTIR Tracking

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 461 ◽  
Author(s):  
Ruitao Wang ◽  
Chunxiang Li ◽  
Zhigang Liu ◽  
Zhongping Yao ◽  
Zhijiang Wang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Film Formation ◽  
Waterborne Polyurethane ◽  
Hydroxyl Groups ◽  
Curing Process ◽  
Polyurethane Coating ◽  
Polyurethane Coatings ◽  
Rate Of Reaction ◽  
Two Component

Waterborne polyurethane coatings were prepared using polyhydroxyacrylate dispersion, polyisocyanate, and propylene glycol diacetate (PGDA). The rate of reaction between hydroxyl and NCO groups in film formation and curing processes was studied by FTIR. The influence of PGDA amount on film formation and curing was also studied. Results showed that PGDA content had a significant effect on the curing process. With less than 10% PGDA, the role of PGDA was more to assist diffusion of polyhydroxyacrylate and polyisocyanate resin droplets. This promoted the reaction between hydroxyl groups and NCO. With more than 10% PGDA, its effect as a solvent was more and it inhibited the reaction between hydroxyl and NCO groups. When the amount of PGDA was about 10%, the synergy between both the roles promoted the crosslinking and curing reactions. The extent of the curing reaction of NCO was more than 70% in 4 h, which was significantly higher, compared with that of about 30% without PGDA. The good applicability and appearance of the waterborne polyurethane coating prepared in this study were verified for the application to carbon fiber metro vehicles.

Synthesis and characterization of non-ionic and anionic two-component aromatic waterborne polyurethane

2018 ◽  
Vol 47 (4) ◽  
pp. 290-299 ◽  
Author(s):  
Sainan Zhang ◽  
Xiankai Jiang
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Soft Segment ◽  
Aqueous Dispersion ◽  
Waterborne Polyurethane ◽  
Content Type ◽  
Hydrophilic Modification ◽  
Two Component ◽  
Better Than

Purpose The purpose of this paper is to synthesize and characterize a series of two-component aromatic waterborne polyurethane (2K-WPU) which is composed of non-ionic and anionic polyisocyanate aqueous dispersion and polyurethane polyol aqueous dispersion. Design/methodology/approach The polyisocyanate aqueous dispersion was synthesized through non-ionic and anionic hydrophilic modification procedures. The values of the hydrogen bonding index (HBI) and molecule structures of WPU were obtained by Fourier transform infrared (FTIR). The thermal, mechanical and water resistance properties of 2K-WPU films were investigated. Findings The appearance of non-ionic polyisocyanate aqueous dispersion and anionic polyisocyanate aqueous dispersion was colorless translucent pan blue and yellow opaque emulsions, respectively. FTIR not only showed that 2K-WPU was obtained from the polymerization of polyisocyanate component and polyhydroxy component by polymerization but also showed that the content of hydrogen bondings of anionic 2K-WPU (WPU 2) was higher than non-ionic 2K-WPU (WPU 1). The glass-transition temperature (Tg), storage modulus and water resistance of WPU 2 were higher than WPU1, whereas the thermal stability of WPU1 was better than WPU 2. Practical implications The investigation established a method to prepare a series of 2K-WPU which was composed of non-ionic or anionic polyisocyanate aqueous dispersion and polyurethane polyol aqueous dispersion. The prepared 2K-WPU film could be applied as substrate resin material in the field of waterborne coating. Originality/value The paper established a method to synthesize a series of 2K-WPU. The effect of HBI value and the molecule structure of soft segment on the thermal stability, mechanical and water resistance properties of 2K-WPU films were studied.

scholarly journals Fluorescence investigation of epoxy resin LG 285 and mathematical description of the curing process

2019 ◽  
Vol 292 ◽  
pp. 01025
Author(s):  
Michaela Mikuličová ◽  
Vladimír Vašek ◽  
Vojtěch Křesálek
Keyword(s):  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Epoxy Resin ◽  
Mathematical Description ◽  
Curing Process ◽  
Steady State Fluorescence ◽  
Two Component ◽  
Different Temperatures ◽  
Increasing Temperature ◽  
Steady State Fluorescence Spectroscopy

In this paper, steady-state fluorescence spectroscopy is used to investigate the curing of two-component epoxy resin LG 285. Moreover, the process of curing is mathematically described. The mixture of resin and hardener HG 287 is measured at five different temperatures (50 °C, 60 °C, 70 °C, 80 °C and 90 °C) for five and a half hours. The results indicate that the process of curing of epoxy resin decelerates with time and accelerates with increasing temperature. Furthermore, the energy of the barrier is calculated.

Preparation and stability of aqueous acrylic polyol dispersions for two-component waterborne polyurethane

2016 ◽  
Vol 14 (1) ◽  
pp. 215-223 ◽  
Author(s):  
Li Wang ◽  
Fei Xu ◽  
Hongxin Li ◽  
Yangyan Liu ◽  
Yali Liu
Keyword(s):  
Waterborne Polyurethane ◽  
Two Component

Study of the kinetic and crosslinking reaction of novolak with epoxy resin

Polymer ◽  
1998 ◽  
Vol 39 (11) ◽  
pp. 2247-2253 ◽  
Author(s):  
M.C. Gualpa ◽  
C.C. Riccardi ◽  
A. Vázquez
Keyword(s):  
Epoxy Resin ◽  
Crosslinking Reaction

scholarly journals STUDY OF THE INFLUENCE OF CONSTITUENT RATIO ON THE CROSSLINKING REACTION OF CASTOR OIL MODIFIED EPOXY RESIN BY 4.4’-DIAMINO DIPHENYLMETHANE

2016 ◽  
Vol 54 (4) ◽  
pp. 501
Author(s):  
Do Minh Thanh ◽  
Le Xuan Hien ◽  
Nguyen Tien Dung
Keyword(s):  
Epoxy Resin ◽  
Castor Oil ◽  
Impact Resistance ◽  
Crosslinking Reaction ◽  
Curing Time ◽  
Optimal Conditions ◽  
Swelling Degree ◽  
Gel Fraction ◽  
Relative Hardness ◽  
Modified Epoxy

The influence of the contents of epoxy resin modified by castor oil (ECO), 4,4’- diamino diphenyl methan (DDM) on the crosslinking reaction of ECO by DDM at 1800C have been studied and the mol ratio of A/E = 1, curing time of 270 min have been determined to be optimal conditions for formation of the cured coating having gel fraction, swelling degree, flexibility, adhesion, impact resistance, and relative hardness of 86%; 188 %; 1 mm, 0 point, 200 kG.cm and 0.33, respectively.

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