Preparation and Application of Polyurethane from Liquefied Waste Paper for Controlled Release Fertilizer

Zhang, Yanfei; Li, Yufeng; Jia, Cong; Zhang, Xiao; Zhang, Min; Lu, Peng; Chen, Hongkun

doi:10.1166/jbmb.2018.1808

Cited by 10 publications

(3 citation statements)

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“…Several studies developed a sequence of coated fertilizers by curing liquefaction products of wheat straw, starch and wastepaper on the surface of the fertilizer, resulting in coatings that had satisfactory biodegradability in soil. The investigations of the impact of coating microstructure on the performance of fertilizer, specifically for the ultrathin coating have been investigated by several scientists (Tian et al, 2019;Lu et al, 2016;Zhang et al, 2018). They optimize the microstructure via blending and fabrication of nanocomposite (Wang et al, 2019).…”

Section: Coatings Based On Polyurethane Nanocompositementioning

confidence: 99%

Coating Properties of Alkyd Resin, Epoxy Resins and Polyurethane Based Nanocomposites: A Review

Ifijen

Udokpoh

Onaiwu

et al. 2022

mejs

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The uniqueness of alkyd resin, epoxy resin, and polyurethane nanocomposites has brought prominent recognition to the field of heavy-duty coating materials. This is expected due to the collaborative features of nano-sized materials such as the high surface area to volume ratio, great functionality per-unit space, extremely small sizes with high density, and that of alkyd resin, epoxy resin, and polyurethane (biodegradability, great gloss retention, adaptability, flexibility, durability, good drying properties, and weathering resistance). The objective of this review was to analyze the extent and currency of research and the development of alkyd, epoxy, and polyurethane nanocomposites in coating applications. Some of the several types of modifications discussed in this review are the incorporation of varying types of nanoclay and metal nanoparticles materials into alkyd resins, the incorporation of carbon nanotubes, MGel-graphene oxide (GO)/gelatin (MGel), Ni (II) Complex-Zeolite and starch-modified nano-ZnO into epoxy resin and the incorporation of (Rb2Co(H2P2O7)2.2H2O), modified nanoparticles of ZnO, diminished graphene oxide (dGO) into polyurethane and their effects on coating applications. The various studied modifications resulted in nanocomposite end-products with much improved properties. However, there are several challenges to the development of nanocomposites that need urgent attention. Some of the challenges discussed are the difficulty involved in transforming fabricated nanocomposites from laboratory to commercialized scale, the capital-intensive nature of synthesizing large nanopowder, etc.

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Section: Coatings Based On Polyurethane Nanocompositementioning

confidence: 99%

Coating Properties of Alkyd Resin, Epoxy Resins and Polyurethane Based Nanocomposites: A Review

Ifijen

Udokpoh

Onaiwu

et al. 2022

mejs

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show abstract

“…The addition reaction of isocyanate and polyol is basic for polyurethane synthesis. After the direct catalytic liquefaction of crop residues, the obtained bio-polyols can substitute petroleum-based polyols to react with isocyanates for polyurethane-coated fertilizer [15,16]. The incorporation of bio-based units into the polyurethane structure is an important strategy for promoting polyurethane biodegradability [17,18].…”

Section: Introductionmentioning

confidence: 99%

Preparation of High Bio-Content Polyurethane Coatings from Co-Liquefaction of Cellulosic Biomass and Starch for Controlled Release Fertilizers

et al. 2023

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To manufacture high bio-content degradable polyurethane-coated fertilizer, the co-liquefaction of corn straw and starch was carried out to convert more biomass into bio-polyol so as to substitute petroleum-based polyol. The effect of the corn straw to starch ratio on liquefaction behavior was mainly investigated by monitoring acid value, hydroxyl value, and liquefaction rate. Both chemical structures and properties of bio-polyols and their coatings were characterized by Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), etc. The results indicated that adding a certain amount of starch to corn straw for co-liquefaction could contribute to a higher hydroxyl content of bio-polyol than that from sole biomass. Compared to molecular weight, the hydroxyl value was a more significant index to ensure coating quality. The incorporation of starch segments to bio-polyol led to good thermal stability, limited residual small molecules, and high crosslinking density of the coating. The controlled-release ability of coated urea prepared by co-liquefied bio-polyol was better than that of corn-straw-based bio-polyol, and the optimal ratio of corn straw to starch was 3:1. Overall, this study provides a new route to fabricate corn straw as a cost-effective and degradable coating with good controlled-release properties, which benefits solid biomass recycling.

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“…Zhang et al . 14 – 16 designed a series of coated fertilizers by curing liquefaction products of starch, wheat straw and waste paper to the fertilizer surface, and the resulted coatings had the good biodegradability in soil. The effect of coating microstructure on fertilizer performance is particularly obvious especially for the ultrathin coating.…”

Section: Introductionmentioning

confidence: 99%

Bio-based polyurethane nanocomposite thin coatings from two comparable POSS with eight same vertex groups for controlled release urea

Wang

et al. 2021

Sci Rep

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Nanocomposite modification has attracted much attention in improving properties of bio-based polymer coating material for coated fertilizer. Herein two comparable polyhedral oligomeric silsesquioxanes (POSS), with eight poly(ethylene glycol) (PEG) and octaphenyl groups attached to the cage, respectively, were successfully incorporated into thin castor oil-based polyurethane coatings via in-situ polymerization on the urea surface. The nanostructure coatings are environmentally friendly, easy to prepare, and property-tunable. The results show that the vertex group of POSS had a pronounced influence on dispersion level and interaction between polyurethane and POSS that well-tuned the release pattern and period of coated urea, even at the coating rate as low as of 2 wt%. The liquid POSS with long and flexible PEG groups had better compatibility and dispersibility in polyurethane matrix than the solid POSS with rigid octaphenyl groups, as evidenced by SEM/EDS. The unique properties were resulted from the different extents of physical crosslinkings. This modification of bio-based polyurethane coating with POSS provided an alternative method of regulating and controlling the properties of coated fertilizer.

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Preparation and Application of Polyurethane from Liquefied Waste Paper for Controlled Release Fertilizer

Cited by 10 publications

References 0 publications

Coating Properties of Alkyd Resin, Epoxy Resins and Polyurethane Based Nanocomposites: A Review

Coating Properties of Alkyd Resin, Epoxy Resins and Polyurethane Based Nanocomposites: A Review

Preparation of High Bio-Content Polyurethane Coatings from Co-Liquefaction of Cellulosic Biomass and Starch for Controlled Release Fertilizers

Bio-based polyurethane nanocomposite thin coatings from two comparable POSS with eight same vertex groups for controlled release urea

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