Improvement on properties of Chinese lacquer by polyamidoamine

Zhang, Ding; Xia, Jianrong; Xue, Hanyu; Zhang, Yuchi; Lin, Qi

doi:10.1002/pen.25371

Cited by 18 publications

(18 citation statements)

References 18 publications

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“…Urushiol, a long‐chain hydrocarbon phenol from lacquer sap, is a mixture of 3‐alkyl‐substituted catechol derivatives with n = 15 linear carbon chains containing 0–3 olefins, together with other minor phenolic liquids, such as those having n = 17 carbon chains. [ 25‐28 ] Scheme 1 shows a typical structure of urushiol. [ 25 ] The compound is obtained through the extraction of lacquer sap from the trees Rhus vernicifera (China, Korea, and Japan), Rhus succedanea (North Vietnam and Formosa), and Melanorrhoea usitate (Thailand and Burma).…”

Section: Introductionmentioning

confidence: 99%

Sustainable phenolic thermosets coatings derived from urushiol

Xia

Xue

Gao

et al. 2020

Polymer Engineering & Sci

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The over‐exploitation of finite fossil resources and/or the increased environmental and sustainable awareness inspire scientists and technologists to search for inexpensive alternatives from renewable chemicals. Phenol formaldehyde (PF) resins, the oldest type of synthetic polymers with good mechanical properties and heat resistance, are widely used in the production of coatings, laminates, molding compositions, and glues. Here, biobased urushiol‐derived PF resins were synthesized from the alkali‐catalyzed reaction between urushiol and formaldehyde. The chemical compositions and molecular structures of resole resins were characterized by carbon‐13 nuclear magnetic resonance and Fourier transform infrared spectroscopy, and their curing behaviors were studied by differential scanning calorimetry. The as‐prepared urushiol‐derived resole resins had methylol (Ph−CH2OH), ortho‐ and para‐hemiformal groups (Ph−CH2OCH2OH), and the para−para/ortho−para/ortho−ortho links of methylene groups (Ph−CH2−Ph), whereas the resole resins had low curing temperatures at about 100–113°C. Additionally, given the long side alkyl group moiety on the aromatic rings of urushiol, the films of cured urushiol‐derived resole resins had low glass transition temperatures of 132 ± 2°C. Furthermore, the as‐prepared urushiol‐derived coatings exhibited excellent physical and mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Sustainable phenolic thermosets coatings derived from urushiol

Xia

Xue

Gao

et al. 2020

Polymer Engineering & Sci

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“…The natural lacquer membranes do not have discoloration, wrinkles, blisters, and chips. Moreover, the addition of 10-20% of IFR reinforces the adhesion of lacquer membranes and the IFR does not fall off from the matrices, which suggests that the incorporation of IFR improves the adhesion level of lacquer membranes [15].…”

Section: Chemical Corrosion Resistance Of Combustion Resistant Rl/ifr Filmsmentioning

confidence: 94%

“…Zhang et al incorporated different contents of dendritic polyamidoamine (PAMAM) with raw lacquer, examining the effects of PAMAM over the curing process and properties of raw lacquer films. The test results showed that the comprehensive performances of raw lacquer films were improved [15]. In addition, the cross-linking between PAMAM and urushiol also helped reduce the curing time and strengthen the alkali resistance for raw lacquer.…”

Section: Introductionmentioning

confidence: 98%

Synthesis of a Compound Phosphorus-Nitrogen Intumescent Flame Retardant for Applications to Raw Lacquer

Shiu

Lou

et al. 2021

Polymers

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Raw lacquer (RL) is a natural polymer compound with highly promising applications; however, its inflammable attribute restricts the industrial applications. In this study, melamine is used to formulate tri (1-melamine-2-propanol) phosphate (FR-1), after which it is synthesized with ammonium phosphate (FR-2) and diatomite to form a compound phosphorus-nitrogen intumescent flame retardant (IFR). Next, IFR is used as the filling agent that then cross-links with RL, and as such RL/IFR membranes are formed after the curing. The limiting oxygen index (LOI) measurement, the vertical combustion test (UL-94), the microshape calorimetric analysis (CCT), and the thermal gravimetric analysis (TGA) are conducted to examine the combustion resistance and thermal stability of the membranes. Fourier transform infrared spectroscopy (FT-IR) and electron scanning microscope (SEM) are performed to separately characterize the structure and compatibility; the mechanical properties of the membranes are also evaluated. The vertical combustion test results confirm that with 30 wt% of IFR, RL/IFR membranes acquire 12.3% higher LOI and a vertically combustion of V-0 level. The TGA indicates that RL/IFR membranes demonstrate a greater adhesion level, a higher rigidity, and better luster than pure RL membranes.

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“…The enzyme-catalysed polymerisation of oriental lacquer sap collected from lacquer trees in Asia allows it to be used as an energy-saving and environmentally friendly coating material with antibacterial, antiseptic, waterproof, and chemically resistant actions [1] , [2] , [3] , [4] , [5] , [6] , [7] . The lacquer thin films ensure excellent physicochemical properties such as high thermal stability, superior durability, anti-corrosiveness, good adhesion, and high gloss [8] , [9] , [10] .…”

Section: Introductionmentioning

confidence: 99%