A PRESENTATION ON: 1 RECYLING OF POLYESTEReNG OF POLYESTERPresented by-Ashish Kumar Dua 2012TTF2406
2POLYSTER & POLYESTER BOTTLES:Most synthetic fibers (approximately 70%) are made from polyester, andthe polyester most often used in textiles is polyethylene terephthalate(PET).The majority of the world’s PET production – about 60% – is used tomake fibers for textiles; about 30% is used to make bottles.It’s estimated that it takes about 104 million barrels of oil for PETproduction each year – that’s 70 million barrels just to produce thevirgin polyester used in fabrics.The reason recycled polyester (often written rPET) is considered agreen option in textiles today is twofold, and the argument goes likethis: Saving energy (33% to 53% less energy than produce from virgin) Estimate at 54.6% fewer CO2 emissions Keeping bottles and other plastics out of the landfills. Some major companies in recycling- 1. Tex America,inc 2. Napcar,USA 3. Fleissner GmbH and Co. INDIAN INSTITUTE OF TECHNOLOGY, DELHI
3FUN FACTS ABOUT POLYSTER :First PET bottle was recycled in 1977FACTS about PET: Recycling 1 ton of PET bottles saves 7.4 cubic yards of landfill space It takes 5 recycled two-liter PET bottles to make one square foot of carpet. PET bottles and containers are actually a form of polyester, which is why it is so easy to recycle bottles into T-shirts, sweaters and socks. It takes 35 liter recycled PET bottles to make the soft filling inside a sleeping bag, called “fiberfill.” Plastic makes up 8% of our trash by weight, but is 24% of the volume
4Introduction: Chemical Structure Rigid Flexible Its having crystallinity around 60-65%. Its having high glass transition temp. around 70-80 ºC . It is produced basically two routes by step growth polymerization. POLYESTER DMT PTA Dimethyl terphththalate Purified terephthalic acid
Glycolysis process .. 6 180-2000C N2 Bis(2-hydroxyetylterphthalate(BHET). EG+ PET are taken in molar basic ratio 1:4 t0 1:6 & .5 % zinc acetate as a catalyst. Applications-1.Resins 2.Coating 3.Laminates 4.Dyes
7 RECYLING OF POLYESTER BOTTLES. Common PET depolymerisation treatments for recycling.Note- Current work aims at effective recycling of waste PET from soft drink bottles byglycolysis method and thereby utilization of recycled product for coating application. INDIAN INSTITUTE OF TECHNOLOGY,DELHI
8PET WASTE USING TO VARIOUS TEXTILE AUXILLARIES :1.Softners-Conversion of BHET TO BHECL form. Fatty acid BHET+thionyl chloride +.5% dimethyl formaldehyde in toluene as a dissolved in catalyst after reaction excess toluene was collected via vacuum distillation.toluene with stirring BHECLAdd amine salt continuously to drop wise After that BHECL Amine added to flask(1:1) derivatives for 3 hr
9CONTINUED: Quaternarization of the amine derivative was carried out by adding dimethyl sulfate (1:1). Sodium carbonate was added as an acid quencher and the mixture was kept at 70 °C for 3 h. Upon distillation of toluene, the cationic softener product was obtained. Following were the fatty acids and amines tried. It gives the details of the reactants Since DETA reacted to BHECL has two free amine groups, whereas EDA reacted to BHECL has one free amine group and hence one mole of this amine combines with one mole of fatty acid. S.R. Shukla et al. / Waste Management 28 (2008) 51–56
Alkyd resins derived from glycolized waste: 14
15Contiuned… European Polymer Journal 41 (2005) 201–210 INDIAN INSTITUTE OF TECHNOLOGY, DELHI
16PREPARTION OF PET POLYOL :Glycolzed product is used for synthesis for PE polyol. Adpic acid+pthallic anhydride +neopentyl BHET PE polyol glycol .5 % of P-toluene sulphonic acid+xylene,inert atm. Prepartaion of PE polyol coating It is used with different isocyanete curing agent ratio NCO:OH (1:1) OF 1:1 Dimetyl formamide is used as a solvent to system. Curing film applied at substrate for 1800c for 1 hr.
RECYCLE PAPER TREATED WITH PET RESIN OR PET 19 COATNG : 1.The PET dispersion can be used with other wet strength resin,such as poly amide-epichlorohydrin. 2. PET not only add additional dry & wet strength but not repulable wet strength resin repulable. .Figure 1. Dry tensile strength of sheets treated with different polyesters. Stephen A Fischer, Repulping wet-strength paper, TAPPI Journal, 141-147, Vol. 80, No. 11
continued : 20 Figure 2. Wet tensile of the sheets treated with different polyestersLSE-Low surface energy productHSE-High surface energy productHTG-High Tg productAdvantages-Its having the high potential to save a large amount of treesand energy while limiting filling.
Recycled pet fibre in concrete –reinforcement 21fibre: Cement & Concrete Composites 29 (2007) 448–455 INDIAN INSTITUTE OF TECHNOLOGY, DELHI
23Development in process technology &processchemistry: INDIAN INSTITUTE OF TECHNOLOGY, DELHI
CONTINUED… 24 T. Ochi et al. / Cement & Concrete Composites 29 (2007)
CONCLUSION: 251.The water dispersible polymer used in coating recyclable paper can be used as a wet endadditive to improve paperdry dry & wet strength. We can make paper water respellent ,paperstiff with good dry strength or both dry & wet strength good by treating with different resins.2. Waste PET was depolymerized via glycolysis product was used for synthesis of new polyesterpolygol. This was used for coating application having excellent mechanical properties like asflexibility ,impact resistance ,scratch & hardness ,good chemical resistance.3.To produce a new material from plastic waste, PET was oligomerized by a poly-functionalalcohol and mixed temp. The presence of oligomers enhanced thermal stability.4. PET waste is used in useful textile finishing softeners. By the high purity of virtual mannerBHET ,it can further converted into quaternary compound which used as softeners in textilefinishing. 5. Recycled PET does not adversely affect the resins properties based on recycled PET canhelp decrease the cost of polymer end product & reduce environment pollution.