The preparation of high solid content waterborne polyurethane by special physical blending

Chai, Chunpeng; Ma, Yifei; Li, Guoping; Zhang, Ge; Ma, Shao-yu; Luo, Yunjun

doi:10.1016/j.porgcoat.2017.10.021

Cited by 40 publications

(18 citation statements)

References 22 publications

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“…For WPU-S 2 , there were few sulfonic acid groups, the charge was weak, the segments were flexible, and the blocking phenomenon was obvious. Compared to the PDI of WPU-L, the PDI of WPU-H containing s-polyester was larger, which is advantageous for the formation of a high solid content emulsion [20].…”

Section: Particle Size Of Emulsionsmentioning

confidence: 90%

“…The emulsion particle adhesion phenomenon occurs in high solid content carboxylic acid type waterborne polyurethane, but not in sulfonic acid type waterborne polyurethane. In our previous research [17,20], the relationship between particle size ratio and solid content was preliminarily studied. A high solid content waterborne polyurethane with particle bimodal distribution was prepared by a special physical blending method.…”

Section: Introductionmentioning

confidence: 99%

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The Relationship between Solid Content and Particle Size Ratio of Waterborne Polyurethane

Hou

Zhang

et al. 2019

Coatings

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A series of high solid content carboxylic acid/sulfonic acid waterborne polyurethanes was prepared by the emulsion dispersion method. The particle size and solid content were measured. By changing the particle size of the large particles to achieve different particle size ratios, high solid content waterborne polyurethanes were obtained at specific particle size ratios. When the particle size ratio was >7, 4–5 or 2–3, the aqueous polyurethane could reach a higher solid content (more than 56%). This indicated that solid content is related to particle size distribution in high solid content waterborne polyurethane. Moreover, the corresponding three-dimensional stacked models (simple cubic accumulation, face-centered cubic accumulation, cubic close packing and hexagonal closest packing) were established.

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Section: Particle Size Of Emulsionsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

The Relationship between Solid Content and Particle Size Ratio of Waterborne Polyurethane

Hou

Zhang

et al. 2019

Coatings

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show abstract

“…Gao et al [15] prepared a flexible conductive polymer nanofiber composite (FCPNC) with the addition of carbon nanotube (CNT) and found that the good electrical conductivity and interconnected porous structure of the FCPNC made it possible to be used as a chemical vapor sensor. However, MWCNTs are inclined to aggregate due to their characteristics of high aspect ratio and specific surface area [16]. When the MWCNT content is low, the number of agglomerated MWCNTs might be reduced to a certain extent.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Multi-Walled Carbon Nanotube/Waterborne Polyurethane Conductive Coatings Prepared by Electrostatic Spraying

Wang

2019

Polymers

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Electrostatic spraying (ES) was used to prepare multi-walled carbon nanotube (MWCNT)/waterborne polyurethane (WPU) abrasion-proof, conductive coatings to improve the electrical conductivity and mechanical properties of WPU coatings. The dispersity of MWCNTs and the electrical conductivity, surface hardness, and wear resistance of the coating prepared by ES (ESC) were investigated. The ESC was further compared with coatings prepared by brushing (BrC). The results provide a theoretical basis for the preparation and application of conductive WPU coatings with excellent wear resistance. The dispersity of MWCNTs and the surface hardness and wear resistance of ESC were obviously better than those of BrC. With an increase in the MWCNT content, the surface hardness of both ESC and BrC went up. As the MWCNT content increased, the wear resistance of ESC first increased and then decreased, while the wear resistance of BrC decreased. It was evident that ESC with 0.3 wt% MWCNT was fully capable of conducting electricity, but BrC with 0.3 wt% MWCNT failed to conduct electricity. The best wear resistance was achieved for ESC with 0.3 wt% MWCNT. Its wear rate (1.18 × 10−10 cm3/mm N) and friction coefficient (0.28) were the lowest, which were 50.21% and 20.00% lower, respectively, than those of pure WPU ESC.

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“…Corrosive mediums can conveniently penetrate through these interfaces to the equipment surfaces and can deteriorate the protective ability of the conductive coating. In addition, nanoscale conductive mediums are prone to agglomeration [8,9], generally resulting in poorer adhesive strength between the conductive coating and the steel substrate and in its worst properties of corrosion resistance and electrical conductivity [10,11]. In order to solve the practical issues above, waterborne polyurethane (WPU) with a safe and reliable ability was used as a polymer matrix [12], and multi-walled carbon nanotubes (MWCNTs) with good properties of corrosion resistance and electroconductibility was used as a conductive medium [13,14].…”

Section: Introductionmentioning

confidence: 99%

Properties of Waterborne Polyurethane Conductive Coating with Low MWCNTs Content by Electrostatic Spraying

Wang

Liu

2018

Polymers

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Because flammable organic solvents are emitted during the construction process, oil-based conductive coatings generally result in potential safety problems. A high content of conductive mediums can also weaken the adhesive and protective abilities of existing conductive coatings. Therefore, an anticorrosive and conductive coating was prepared on Q235 steel substrate by spraying the multi-walled carbon nanotubes (MWCNTs)/waterborne polyurethane (WPU) dispersion with a low MWCNT content in this work. The effect of the MWCNT content on the electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating was investigated. It was concluded that a spatial network structure of MWCNTs-WPU was formed to make the coating structure more compact. The electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating first increased and then decreased as the MWCNT content increased. When the MWCNT content was only 0.2 wt % (which was far lower than that of the existing conductive coatings at 1 wt %), the coating began to conduct electricity; its resistivity was 12,675.0 Ω·m. The best combination property was the 0.3 wt % MWCNTs/WPU conductive coating. Its adhesive strength was 19.99% higher than that of pure WPU coating. Its corrosion rate was about one order of magnitude lower than that of pure WPU coating after being immersed in 3.5 wt % NaCl solution for 17 days.

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The preparation of high solid content waterborne polyurethane by special physical blending

Cited by 40 publications

References 22 publications

The Relationship between Solid Content and Particle Size Ratio of Waterborne Polyurethane

The Relationship between Solid Content and Particle Size Ratio of Waterborne Polyurethane

Mechanical Properties of Multi-Walled Carbon Nanotube/Waterborne Polyurethane Conductive Coatings Prepared by Electrostatic Spraying

Properties of Waterborne Polyurethane Conductive Coating with Low MWCNTs Content by Electrostatic Spraying

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