Synthesis and properties of novel water‐dispersible polyisocyanates

Li, Guo; Wang, Lei; Huang, Shan; Qu, Jinqing

doi:10.1002/app.44735

Cited by 11 publications

(5 citation statements)

References 21 publications

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“…The T gs remarkably decreased and the T gh slightly increased, which increased the Δ T g and caused a strong microphase separation. Consequently, the movement of the two-component waterborne polyurethane chains was weakened by 1,5-dihydroxy naphthalene due to the strong intermolecular interactions and poor soft segment movement [ 3 ]. The microphase separation of NOWPU-0.5 and NOWPU-1.0 was lager than that of the NOWPU-0 because the T gs of 1,5-dihydroxy naphthalene is much larger than that of NOWPU-0.…”

Section: Discussionmentioning

confidence: 99%

“…Two-component waterborne polyurethanes are important in coatings, adhesives, wood products, and automobiles because of their non-toxic, excellent properties, and an outstanding weatherability [ 1 , 2 , 3 ]. Two-component waterborne polyurethanes consist of a hydroxyl component and an isocyanate component, and are combustible materials if they are not modified with flame-retardant treatments.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Multifunctional Two-Component Waterborne Polyurethane Coatings: Fluorescence, Thermostability and Flame Retardancy

Yin

Luo

2017

Polymers

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Fluorescent and flame-retardant two-component waterborne polyurethane coatings were synthesized using 1,5-dihydroxy naphthalene, a halogen-free polyphosphate and a hydrophilic curing agent, and their properties were systematically characterized. The average particle sizes and zeta potential values were below 170 nm and −30 mV. Meanwhile, the multifunctional two-component waterborne polyurethane coatings had strong fluorescence intensities. When comparing with the coatings with 0.5 wt % 1,5-dihydroxy naphthalene, the coatings with 1.0 wt % 1,5-dihydroxy naphthalene had a stronger microphase separation. Interestingly, the thermostability of the multifunctional coatings was remarkably improved through 1.0 wt % 1,5-dihydroxy naphthalene, and besides it belonged to nonflammable materials. Additionally, all of the coating films passed the solvent resistance testing. These samples with different amounts of 1,5-dihydroxy naphthalene are environmental friendly, especially applications that require transparent and fluorescent coatings.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Multifunctional Two-Component Waterborne Polyurethane Coatings: Fluorescence, Thermostability and Flame Retardancy

Yin

Luo

2017

Polymers

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“…Since this reaction could convert the hydrogen bonding into chemical bonds between fibers [4], paper can become a new high-strength, water-resistant, oil-resistant special paper after the treatment. This work can open up broader prospects for the application of paper in packaging, printing, construction, and other industrial and agricultural production [5,6].…”

Section: Introductionmentioning

confidence: 95%

Scanning Electron Microscopy Investigation for Monitoring the Emulsion Deteriorative Process and Its Applications in Site-Directed Reaction with Paper Fabric

et al. 2021

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The O/W isocyanate emulsion can be used as a sizing agent to improve the waterproof performance of paper. However, the -NCO content in the emulsion diminishes with the prolongation of standing time. What is happening to this seemingly stable emulsion, especially concerning its microstructure evolution? We propose to monitor the emulsions deteriorative process by combining freeze-drying technique and SEM. Thus, the emulsion containing -NCO active group was obtained by the synthetic polymer emulsification of HDI trimers. The results of SEM demonstrate that the emulsion deteriorative process actually represents the collapsing and fusion of stable honeycomb structure with the prolongation of standing time and increasing temperature. This is possibly due to the fact that the inner aggregative HDI trimers are reacting with outside water to form urethane macromolecules, and this results in the collapsing and fusion of the honeycomb structure, as observed in SEM images. Moreover, the measurement results of -NCO content and FT-IR spectroscopy present the -NCO content as reducing with increasing standing time and temperature. This conclusion further proves our hypotheses. Additionally, the emulsions are used to treat the paper by site-directed reaction. The results show that the with the increase of the standing time and temperature, the contact angles and surface free energy show a decrease and an increase, respectively, whereas surface free energy appeared at a minimum of 29.19 mJ·m−2 when the standing time and temperature was 1 h and 25 °C.

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“…One reason is that HFPO is a soft modifier, which reduces the content of hard segments in the PU system and lifts the restraint on the soft segments and enhances mobility at low temperatures. 113 Another reason is that there is –O–CH 3 in the sidechains, which provides strong chain flexibility. Details of the mechanical properties and flame-retardance are listed in Table 2 .…”

Section: One-component Hifwpumentioning

confidence: 99%

Halogen-free instinct flame-retardant waterborne polyurethanes: composition, performance, and application

Yin

Pang

et al. 2022

RSC Adv.

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Synthesis and properties of novel water‐dispersible polyisocyanates

Cited by 11 publications

References 21 publications

Synthesis and Characterization of Multifunctional Two-Component Waterborne Polyurethane Coatings: Fluorescence, Thermostability and Flame Retardancy

Synthesis and Characterization of Multifunctional Two-Component Waterborne Polyurethane Coatings: Fluorescence, Thermostability and Flame Retardancy

Scanning Electron Microscopy Investigation for Monitoring the Emulsion Deteriorative Process and Its Applications in Site-Directed Reaction with Paper Fabric

Halogen-free instinct flame-retardant waterborne polyurethanes: composition, performance, and application

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