Improved polyurethane dispersion stability via continuous process

Keyvani, M.

doi:10.1002/adv.10050

Cited by 20 publications

(22 citation statements)

References 9 publications

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“…Keyvani7 reported that the waterborne PU modified with acrylic resin had the lowering of cost and the improvements of water resistance, chemical resistance, gloss, hardness, and mechanical properties. So, for the requirements of environmental protection and reducing cost, the polyurethane‐acrylate (PUA) hybrid emulsion has been paid more attention as a type of environment‐friendly material.…”

Section: Introductionmentioning

confidence: 99%

Preparation, mechanical properties of waterborne polyurethane and crosslinked polyurethane‐acrylate composite

Qiu

Wang

et al. 2011

J of Applied Polymer Sci

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The waterborne polyurethane (PU) prepolymer was first prepared based on isophorone diisocyanate, polyether polyol (NJ-210), dimethylol propionic acid (DMPA), and hydroxyethyl methyl acrylate via in situ method. The crosslinked waterborne polyurethane-acrylate (PUA) dispersions were prepared with the different functional crosslinkers. The chemical structures, optical transparency, and thermal properties of PU and PUA were confirmed by Fourier transform infrared spectrometry, ultraviolet-visible spectrophotometry, and differential scanning calorimetry. Some physical properties of the aqueous dispersions such as viscosity, particle size, and surface tension were measured. Some mechanical performances and solvent resistance of PUA films were systemically investigated. The experimental results showed that the particle sizes of the crosslinked PUA aqueous dispersions were larger than the PU and increased from 57.3 to 254.4 nm. When the ratios of BA/St, BA/TPGDA, and BA/TMPTA were 70/30, PUA films exhibited excellent comprehensive mechanical properties. The tensile strength and elongation at break of the film were 2.17 MPa and 197.19%. When the ratio of BA/St was 30/70, the film had excellent water resistance and was only 6.47%. The obtained PUA composites have great potential application such as coatings, leather finishing, adhesives, sealants, plastic coatings, and wood finishes.

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Section: Introductionmentioning

confidence: 99%

Preparation, mechanical properties of waterborne polyurethane and crosslinked polyurethane‐acrylate composite

Qiu

Wang

et al. 2011

J of Applied Polymer Sci

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“…This process is necessary for the formation of a stable dispersion in water; the final particle size of the dispersion depends on both neutralization and agitation. 2,9,15,16 For all the libraries the controlled addition of TEA was done over a period of 5 or 10 min after the temperature reached 70°C while stirring at 400 rpm. Changing the rate of addition of TEA in one of the libraries, PUD-E, did not have a significant effect on the number of good PUDs formed.…”

Section: Resultsmentioning

confidence: 99%

“…This is because waterborne systems are very sensitive to the factors involved during the development of the coatings and during the application. 2,4 Some of the advantages of waterborne PUDs are low VOC, minimal toxicity and environmental issues, and freedom from flammability and explosion hazards. Another important structural and functional characteristic of waterborne PUDs is the presence of polar ionic groups (typically carboxylate or sulphonate) in the polymer chain.…”

Section: Introductionmentioning

confidence: 99%

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Automated parallel polyurethane dispersion synthesis and characterization

et al. 2008

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The synthesis of waterborne polyurethane dispersions (PUDs) using an automated parallel reactor system was explored. Waterborne PUDs are an important class of polymer dispersion that can be used in many applications such as coatings for wood finishing, glass fiber sizing, adhesives, automotive topcoats, and other applications. Herein, we present the synthesis of aqueous PUDs using a Chemspeed Autoplant A100 TM automated parallel reactor system. This is the first time a PUD has been synthesized using an automated parallel reactor system. The synthesis involves the formation of an isocyanate-terminated prepolymer followed by neutralization, dispersion in water, and chain extension. Details of the methodology are discussed with respect to the process of writing the program for the synthesis to synthesizing the PUD itself with the Chemspeed. It is demonstrated that an aqueous PUD can be synthesized with an automated parallel process and the unit-to-unit results are similar. Process variables such as agitator design, rate of neutralization, and rate of water dispersion are varied as these are the three major factors which lead to the desired end product property. The controlled addition of neutralizer, water, and chain extender is an added advantage with this automated technique and gave consistent results in all the units. The PUDs were characterized for their particle size, viscosity, and percent solids.

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“…Novel methods for synthesizing PUDs have attracted the interests of researchers. Peter and Arthur and Keyvani first synthesized isocyanate‐terminated prepolymer, and then dispersion and chain extension stages were carried out in a continuous mode to form PUDs . However, there are some differences in their synthesis processes.…”

Section: Introductionmentioning

confidence: 99%

Preparation of polyurethane ionomers by reactive extrusion and dispersions containing sulfonate groups and polyethylene glycol segments

Sun

2019

J of Applied Polymer Sci

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A synthesis method of polyurethane ionomers (PUIs) and anionic/nonionic polyurethane dispersions (PUDs) is introduced in this article. PUIs were synthesized in twin‐screw extruder without organic solvent. PUIs were then dissolved in acetone and dispersed in water. The PUDs were obtained after distilling off acetone and the solid content of PUDs was about 55% and had excellent stability. PUDs obtained were mainly used as adhesives. PUIs were synthesized from poly(1,4‐butylene adipate glycol) (PBA) as soft segments, 1,4‐butanediol (BDO) and diphenylmethane diisocyanate‐50 (MDI‐50) as hard segments, poly(ethylene glycol) methyl ether (MPEG) and polyether diol‐containing sulfonate (SPPG) as hydrophilic monomers, and dibutyltin dilaurate (DBTDL) as catalyst. The particle size, viscosity, and adhesive properties of the PUDs were measured and the results indicated that PUDs obtained have excellent stability and adhesive properties, such as the maximum initial peel strength and T‐peel strength were 2.38 and 11.82 N mm−1, respectively. The thermal properties, tensile stress–strain, and water resistance of the PUIs films were also characterized. The test results showed that films have good thermal properties and water resistance properties, and some typical characteristics of crystalline polymers were revealed in the tensile stress–strain curves. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47719.

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Improved polyurethane dispersion stability via continuous process

Cited by 20 publications

References 9 publications

Preparation, mechanical properties of waterborne polyurethane and crosslinked polyurethane‐acrylate composite

Preparation, mechanical properties of waterborne polyurethane and crosslinked polyurethane‐acrylate composite

Automated parallel polyurethane dispersion synthesis and characterization

Preparation of polyurethane ionomers by reactive extrusion and dispersions containing sulfonate groups and polyethylene glycol segments

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