scholarly journals Preparation and characterization of waterborne alkyd-amino baking coatings based on waste polyethylene terephthalate

2020 ◽  
Vol 7 (1) ◽  
pp. 191447
Author(s):  
Xia Yun ◽  
Yang Xin-yi ◽  
Gong Dun-hong ◽  
Ding Yong-bo ◽  
Shen Liang
Keyword(s):  
Polyethylene Terephthalate ◽  
Chemical Resistance ◽  
Alkali Resistance ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Pet Waste ◽  
Amino Resin ◽  
Excellent Adhesion ◽  
Hydrolysis Of

The recycling of polyethylene terephthalate (PET) is the most attractive method for PET waste management because it not only decreases the load on landfill space, but also provides opportunities for reducing the use of raw petrochemical products. Therefore, in this investigation, neopentyl glycol is used for alcoholysis of waste PET, and glycolyzed PET product was applied for preparation of the waterborne alkyd resin. Furthermore, the waterborne alkyd-amino baking coatings were prepared from the waterborne alkyd based on glycolyzed waste PET and melamine formaldehyde resin and applied on tinplate. The waterborne alkyd-amino resin films showed excellent adhesion, balanced hardness and flexibility, high gloss and outstanding chemical resistance except for alkali resistance owing to hydrolysis of ester bonds.

Preparation and characterization of melamine-formaldehyde resin microcapsules containing fragrant oil

2006 ◽  
Vol 11 (4) ◽  
pp. 332-336 ◽  
Author(s):  
Jun-Seok Hwang ◽  
Jin-Nam Kim ◽  
Young-Jung Wee ◽  
Jong-Sun Yun ◽  
Hong-Gi Jang ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin

Polyurethane resin derived from polyol of palm olein and recycled poly(ethylene terephthalate)

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Abbas Ahmad Adamu ◽  
Norazilawati Muhamad Sarih ◽  
Seng Neon Gan
Keyword(s):  
Thermal Stability ◽  
Palm Olein ◽  
Ethylene Terephthalate ◽  
Alkali Resistance ◽  
Pet Waste ◽  
Content Type ◽  
Pet Bottles ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Excellent Adhesion

Purpose Poly(ethylene terephthalate) (PET) waste from soft drink bottles was incorporated into palm olein alkyd to produce new polyol for use in polyurethane resins as surface protection on metal surfaces. Design/methodology/approach Alkyd was prepared from palm olein, glycerol and phthalic anhydride. PET underwent simultaneous glycolysis and transesterification reactions with the alkyd. Varying the amount of PET has led to polyols with different viscosities. Polyurethane resins were produced by reacting the polyols with toluene diisocyanate. The resins were coated on mild steel panels and cured. Performances of the cured films were tested. Findings The polyurethanes (PU) resin cured to a harder film with better thermal stability. Films showed excellent adhesion properties, while higher content of PET exhibited higher pencil hardness, better water, salt, acid and alkali resistance. Research limitations/implications Other vegetable oils could also be used. The alkyd structure could be changed by formulation to have different functionality and the ability to incorporate higher amount of PET waste. Rate of glycolysis of PET could be increased by higher amount of ethylene glycol. Practical implications This method has managed to use waste PET in producing new polyol and PU resins. The cured films exhibit good mechanical and chemical properties, as well as excellent adhesion and thermal stability. Social implications The non-biodegradable PET has created environmental pollution problems connected to littering and illegal landfilling. It has become necessary to pay greater attention to recycling PET bottles for obtaining valuable products. Originality/value This approach is different from the earlier reports, where PET was recycled to recover the raw materials.

Improving coating properties of shellac–epoxidised-novolac blends with melamine formaldehyde resin

2017 ◽  
Vol 46 (2) ◽  
pp. 92-99 ◽  
Author(s):  
Mohammad Fahim Ansari ◽  
Gautam Sarkhel
Keyword(s):  
Metal Surfaces ◽  
Water Resistance ◽  
Coating Material ◽  
Alkali Resistance ◽  
Formaldehyde Resin ◽  
Coating Properties ◽  
Melamine Formaldehyde ◽  
Novolac Resin ◽  
Content Type ◽  
Melamine Formaldehyde Resin

Purpose The purpose of this study is to improve the coating properties of shellac–epoxidised novolac blends by treatment with melamine formaldehyde resin (MF) at ambient temperature for its use as a coating material. Design/methodology/approach Epoxidised-novolac resin was synthesised by epoxidation of novolac resin with epichlorohydrin. Novolac resin was synthesised by reaction of phenol with formaldehyde in acidic medium. Shellac was blended with the epoxidised-novolac resin in solution in varying ratios and treated the blends with MF resin in fixed ratio. Coating properties of the treated compositions were studied using a standard procedure. The compositions were characterised with Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and scanning electron microscopic (SEM) spectroscopy. Findings Treatment of shellac–epoxidised-novolac blends with MF resin improved water and alkali resistance of the blends, besides enhancing gloss. Gloss in all the blends was uniformly increased on treatment with MF resin. Water resistance of the blends tremendously improved after treatment with MF resin. Contact angle of the blends against water increased while decreased against ethylene glycol and dioxane. The compositions were more resistant to polar solvent than non-polar ones, suggesting that the compositions shifted to hydrophobic (lipophilic) nature on treatment with the MF resin. Research limitations/implications A specified concentration of MF resin was used in the study. Different concentrations of the MF resin can also be tried for treatment of shellac–epoxidised-novolac blends to see the effect of the resin on the blends. Practical implications Treatment of shellac–epoxidised-novolac blend with MF resin improved the coating properties of the blends. The formulation SeNB-64 is the best with high gloss, good impact, scratch hardness and water resistance, and hence can be used as coating material for metal surfaces. Originality/value Blending of shellac with epoxidised-novolac resin and treatment of the blends with the MF resin was done for the first time. The formulation SeNB-64 can be used as coating material for metal surfaces.

Synthesis and Properties of Melamine-Formaldehyde/Montmorillonite Nanocomposites

2008 ◽  
Vol 8 (4) ◽  
pp. 1775-1781 ◽  
Author(s):  
Haitao Wang ◽  
Xiangfu Meng ◽  
Zhongzhong Qian ◽  
Hu Zhou ◽  
Yanfen Ding ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Raman Spectroscopy ◽  
Chemical Resistance ◽  
Formaldehyde Resin ◽  
Polycondensation Reaction ◽  
Melamine Formaldehyde ◽  
Formaldehyde Content ◽  
Acetyl Acetone ◽  
Modified Montmorillonite

In this paper, intercalated and partially exfoliated melamine-formaldehyde (MF)/montmorillonite (MMT) nanocomposites have been synthesized successfully via in-situ polymerization based on pristine montmorillonite, acidified montmorillonite and organic modified montmorillonite respectively. The obtained nanocomposites were characterized by XRD, TEM, TGA, and Raman spectroscopy. Free formaldehyde content of those composites was also determined by acetyl acetone technique. It was found that acidified montmorillonite and organic modified montmorillonite could catalyze the polycondensation reaction of methylolmelamines. The thermal stability and chemical resistance of those two nanocomposites were also improved dramatically compared to pure melamine-formaldehyde resin.

Synthesis and Characterization of Melamine-Formaldehyde Resin for Foaming Use

2014 ◽  
Vol 628 ◽  
pp. 24-27
Author(s):  
Jun Xia Liu ◽  
Lei Zhou ◽  
Qi Bin Jiang ◽  
Jin Yang ◽  
Jian Jun Xie
Keyword(s):  
Orthogonal Experiment ◽  
Solid Content ◽  
Formaldehyde Resin ◽  
Optimal Conditions ◽  
Melamine Formaldehyde ◽  
Solution Ph ◽  
Melamine Formaldehyde Resin ◽  
Size Uniformity ◽  
Evaluation Parameters

The effects of mole ratio of formaldehyde and melamine (F/M), solution pH, reaction temperature and time on the foaming melamine-formaldehyde resin (MF resin) with caprolactam as modifier were investigated by orthogonal experiment design where the solid content and the viscosity of the resin, the density and the size uniformity of the foam resin were used as performance evaluation parameters. The results had shown that the optimal conditions for preparing the foaming MF resin were F/M= 3.25, pH=8.0, T=90°C, t=45min. The MF resin prepared under the optimal conditions could be foamed well and its storage time was prolonged to 16 days. The structure and thermal properties of MF resin under the optimal conditions were investigated.

scholarly journals Fusion of Chitin-Binding Domain From Chitinolyticbacter meiyuanensis SYBC-H1 to the Leaf-Branch Compost Cutinase for Enhanced PET Hydrolysis

2021 ◽  
Vol 9 ◽  
Author(s):  
Rui Xue ◽  
Yinping Chen ◽  
Huan Rong ◽  
Ren Wei ◽  
Zhongli Cui ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Enzymatic Hydrolysis ◽  
Polyethylene Terephthalate ◽  
Binding Domain ◽  
Plastic Pollution ◽  
Pet Waste ◽  
Chitin Binding Domain ◽  
C Terminus ◽  
Measurable Activity ◽  
Hydrolysis Of

Polyethylene terephthalate (PET) is a mass-produced petroleum-based non-biodegradable plastic that contributes to the global plastic pollution. Recently, biocatalytic degradation has emerged as a viable recycling approach for PET waste, especially with thermophilic polyester hydrolases such as a cutinase (LCC) isolated from a leaf-branch compost metagenome and its variants. To improve the enzymatic PET hydrolysis performance, we fused a chitin-binding domain (ChBD) from Chitinolyticbacter meiyuanensis SYBC-H1 to the C-terminus of the previously reported LCCICCG variant, demonstrating higher adsorption to PET substrates and, as a result, improved degradation performance by up to 19.6% compared to with its precursor enzyme without the binding module. For compare hydrolysis with different binding module, the catalytic activity of LCCICCG-ChBD, LCCICCG-CBM, LCCICCG-PBM and LCCICCG-HFB4 were further investigated with PET substrates of various crystallinity and it showed measurable activity on high crystalline PET with 40% crystallinity. These results indicated that fusing a polymer-binding module to LCCICCG is a promising method stimulating the enzymatic hydrolysis of PET.

Preparation and Characterization of Melamine-Formaldehyde Resin Micro- and Nanocapsules Filled with n-Dodecane

2012 ◽  
Vol 51 (10) ◽  
pp. 1976-1990 ◽  
Author(s):  
Kongying Zhu ◽  
Hengzhi Qi ◽  
Shuang Wang ◽  
Jianwei Zhou ◽  
Yunhui Zhao ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin
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