Synthesis of stable high hydroxyl content self‐emulsifying waterborne polyacrylate emulsion

Zhang, Chaoying; Zhu, Zhewen

doi:10.1002/app.44844

Cited by 14 publications

(16 citation statements)

References 22 publications

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“…Waterborne polyurethane (WPU) has attracted considerable attention as a promising environmentally friendly polymer, with excellent processability, low volatile organic compounds, and other superior properties . However, the use of WPU in coatings, leathers, textiles, membranes, and adhesives is greatly limited because of its intrinsic flammability . So, there is a strong need to improve the poor flame retardancy of WPU to increase its application.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a phosphorus‐ and nitrogen‐containing flame retardant and evaluation of its application in waterborne polyurethane

Wang

Cheng

et al. 2018

J of Applied Polymer Sci

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A phosphorus-and nitrogen-containing intumescent flame retardant, pentaerythritol di-N-hydroxyethyl phosphamide (PDNP), was synthesized with phosphorus oxychloride, pentaerythritol, and ethanolamine as raw materials. Using the prepared PDNP as a chain extender, a series of flame-retardant waterborne polyurethanes (WPU) were prepared, and their structures were characterized using NMR and Fourier transform infrared spectroscopy (FTIR). Additionally, the thermal properties and flame retardancy of WPU films were investigated by thermogravimetric analysis, limiting oxygen index (LOI) tests, cone calorimeter tests, and thermogravimetry-FTIR. These results indicated that PDNP materials exhibit good char-forming ability at high temperature and that PDNP-modified waterborne polyurethane obtained an LOI value of 26.0% for a PDNP content of 9 wt %. Finally, the morphology and the element distributions of char residues of WPU were analyzed by scanning electron microscopy and energy dispersive spectrometry after combustion.

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Section: Introductionmentioning

confidence: 99%

Synthesis of a phosphorus‐ and nitrogen‐containing flame retardant and evaluation of its application in waterborne polyurethane

Wang

Cheng

et al. 2018

J of Applied Polymer Sci

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“…Methyl methacrylate homopolymer has a T g of about 105 °C, and the butyl acrylate homopolymer has a T g of about −57 °C, while the difference in glass transition temperature decreases because of the binary copolymerization. The former's T g decreases to 40 °C, and the latter's T g rises to −26 °C, it means that PMMA‐ co ‐PBA has a significant phase separation, that is, the methyl methacrylate polymer component corresponds to the hard segment phase and the butyl acrylate polymer component corresponds to the soft segment phase.…”

Section: Resultsmentioning

confidence: 99%

Robust, Transparent, Thermally Healable Copolyacrylate Elastomer: The Effect of β‐Hydroxyethyl Acrylate on its Properties

Zhao

Chen

Dai

et al. 2019

Macro Chemistry & Physics

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as the hard segment phase. Montana et al. [14] discovered that the block copolymer PMMA-PBA-PMMA could toughen PMMA up to an elongation at break about 17.5%, but decrease its tensile strength. It can be seen from the above-mentioned literatures that the toughness of PMMA can be greatly improved by introducing inorganic nanofillers, polymers with lower T g , or copolymerization units. However, the methods can cause relatively low strength of polyacrylate, and reduce its transparency at visible light deriving from the presence of phase separation structure. The incorporation of the third or more monomer units into binary polyacrylate can increase the compatibility of original polymers, that is, a narrower T g gap between the soft and hard phases, [16] thereby changing the phase separation structure. [17,18] The particle-brush and star polymers with the core-shell structure are prepared by atom transfer radical polymerization of BA with styrene and acrylonitrile, and then blended with PMMA. [19] The toughness of the blend prepared is better than PMMA, and its transparency is close to that of PMMA. The polymer films prepared by methyl methacrylate, butyl methacrylate, and glycidyl methacrylate exhibit different T g s with the increase of glycidyl methacrylate content, so the phase separation structure was modified and the latex film cast on the glass plate was transparent. [20] It can be seen that the copolyacrylate is still an elastomer and has good visible-light transmittance after the incorporation of the third or more monomer units.The transmittance of elastomer will be significantly reduced after damage, while the self-healing of transparent elastomer can improve its application performance and service life. The self-healing effect derived from dynamic non-covalent interactions, such as hydrogen bonding, [21][22][23] electrostatic, [7] dipoledipole, [3] host-guest, [24,25] intermolecular interactions, [26,27] and so on, can be applied to the transparent elastomer. The copolyacrylate is still an elastomer after the incorporation of the third or more monomer units, which will provide the mobility of molecular chain and contribute to intermolecular interactions, promoting self-healing, but will decrease the mechanical strength of copolyacrylate. So the healing of transparent copolyacrylate elastomer remains to be further studied. [28,29] The copolymerization of BA and MMA can improve the toughness of PMMA, but its transparency is reduced by the phase separation behavior. The glass transition temperature of HEA homopolymer is between those of PMMA and PBA. HEA will be incorporated into the copolymerization system as a third Transparent ElastomersThe contradiction between mechanical properties, transparency, and healing effects for polyacrylate elastomers is not solved yet. The copolyacrylate elastomers are prepared based on the bulk copolymerization with methyl methacrylate (MMA) and butyl acrylate (BA), incorporating the β-hydroxyethyl acrylate (HEA) monomer. Compared with PMMA-co-PBA, with the incorporation of HEA...

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“…However, in the process of emulsion film formation, small molecule emulsifiers easily desorb from polymer particles and migrate to the surface of the coating, a weak boundary layer is produced at the bonding site, resulting in shrinkage of the film, affecting the water resistance and adhesion of the coating. Moreover, commonly used emulsifiers contain sulfonic acid groups, which remain in the film and are corrosive to the metal substrate, the dosage of emulsifier should be reduced as much as possible . Xu et al .…”

Section: Introductionmentioning

confidence: 99%

Preparation of high hydroxyl self‐emulsifying polyester and compounding with acrylate

Huang

Gong

2019

J of Applied Polymer Sci

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Waterborne saturated polyester (WSP) with high hydroxyl content was prepared through solution polymerization by using stepwise feeding and stage heating methods. The stability of polyester dispersion was enhanced in terms of molecular structure and polymerization process. The conditions of polymerization process, monomer types, and catalyst type were determined. The effects of the ratio of alcohol-to-acid, trimethylolpropane (TMP) content and the feeding method, the content of terminal monomer and branched monomer on the dispersion were investigated. The stability of the self-emulsifying polyester and the water resistance of the film were proved to be excellent. Through transesterification, waterborne unsaturated polyester (WUP) was synthesized by WSP. Polyester-acrylate composite emulsion can be obtained by physical blending or chemical copolymerization of synthetic waterborne polyester. The viscosity of the composite emulsion was improved, and the hardness and water resistance were improved.

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Synthesis of stable high hydroxyl content self‐emulsifying waterborne polyacrylate emulsion

Cited by 14 publications

References 22 publications

Synthesis of a phosphorus‐ and nitrogen‐containing flame retardant and evaluation of its application in waterborne polyurethane

Synthesis of a phosphorus‐ and nitrogen‐containing flame retardant and evaluation of its application in waterborne polyurethane

Robust, Transparent, Thermally Healable Copolyacrylate Elastomer: The Effect of β‐Hydroxyethyl Acrylate on its Properties

Preparation of high hydroxyl self‐emulsifying polyester and compounding with acrylate

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