Construction and demolition waste as a source of PVC for recycling

2011 ◽  
Vol 30 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Sabrina Moretto Darbello Prestes ◽  
Sandro Donnini Mancini ◽  
Antonio Rodolfo ◽  
Raquel Carramillo Keiroglo
Keyword(s):  
Ethylene Terephthalate ◽  
Ash Content ◽  
Construction And Demolition Waste ◽  
Particle Sizes ◽  
Virgin Material ◽  
Demolition Waste ◽  
Poly Ethylene Terephthalate ◽  
Application Potential ◽  
Poly Ethylene ◽  
Recycled Material

Construction and demolition waste can contain considerable amounts of polyvinyl chloride (PVC). This paper describes a study of the recycling of PVC pipes collected from such waste materials. In a sorting facility for the specific disposal of construction and demolition waste, PVC was found to represent one-third of the plastics separated by workers. Pipes were sorted carefully to preclude any possible contamination by poly(ethylene terephthalate) (PET) found in the waste. The material was ground into two distinct particle sizes (final mesh of 12.7 and 8 mm), washed, dried and recycled. The average formulation of the pipes was determined based on ash content tests and used in the fabrication of a similar compound made mainly of virgin PVC. Samples of recycled pipes and of compound based on virgin material were subjected to tensile and impact tests and provided very similar results. These results are a good indication of the application potential of the recycled material and of the fact that longer grinding to obtain finer particles is not necessarily beneficial.

Microwave Accelerated Methanolysis of Poly(ethylene terephthalate)

2021 ◽  
Author(s):  
Bryn Monnery
Keyword(s):  
Hot Spots ◽  
Energy Use ◽  
Ethylene Terephthalate ◽  
Economic Value ◽  
Active Surface ◽  
Virgin Material ◽  
Microwave Reactor ◽  
Poly Ethylene Terephthalate ◽  
Order Of Magnitude ◽  
Poly Ethylene

Poly(ethylene terephthalate) (PET) is an important commodity polymer that has the potential to be 100% recycled, but this is currently not economically viable as the costs of recovering the starting materials are greater than virgin materials. As well as PET, there are a number of other interesting poly(terephthalate)s which have higher economic value. However, for many of these, virgin material is necessary to avoid contamination with ET units. This can be avoided by chemically deconstructing the PET to simple terephthalates. In this work, we show that dimethyl terephthalate (DMT) can be easily obtained from PET, in high purity (> 99.5% for the crude) with a relatively low energy use (ca. 0.3 Mj.g-1), by using a microwave reactor. In a microwave reactor the methanolysis proceeds an order of magnitude faster than in a conventional reactor. This is apparently due to cavitation caused by hot-spots, which break up the PET, increasing the active surface, and an increased population of PET particles above the Ea in the hot zones.

Assessing changes on poly(ethylene terephthalate) properties after recycling: Mechanical recycling in laboratory versus postconsumer recycled material

2014 ◽  
Vol 147 (3) ◽  
pp. 884-894 ◽  
Author(s):  
María del Mar Castro López ◽  
Ana Isabel Ares Pernas ◽  
Mª José Abad López ◽  
Aurora Lasagabaster Latorre ◽  
J.M. López Vilariño ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Mechanical Recycling ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Recycled Material

scholarly journals Recycled PET ((Poly) Ethylene-erephthalate) used as straps for rebar binding

2016 ◽  
Vol 14 (3) ◽  
pp. 319-329
Author(s):  
Miodrag Grbic ◽  
Milan Glisic ◽  
Radojko Obradovic
Keyword(s):  
Experimental Method ◽  
Ethylene Terephthalate ◽  
Concrete Construction ◽  
Recycled Pet ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Annealed Wire ◽  
Eligibility Assessment ◽  
Recycled Material ◽  
Environment Preservation

Recycling has an important role in modern production and in environment preservation. Introduction of recycled PET ((Poly) Ethylene-terephthalate) as straps for reinforcement bars in concrete construction elements can help these important issues. By using an experimental method it is shown that PET straps made with minimal investment, on site and with manual production can replace "annealed" wire as element for connection of reinforcement bars. An overview of some regulation and procedures is presented and used for eligibility assessment of the proposed straps made of recycled material. Also an overview of commonly used connections is given so it can be compared with the proposed ones.

Structure and Properties of r-PET/TPEE/LDPE-g-AA Blends

2014 ◽  
Vol 884-885 ◽  
pp. 320-323
Author(s):  
Qiao Ling Huang ◽  
Hua Ji Zhang ◽  
Wen Zhang ◽  
Xin Tu Lin
Keyword(s):  
Ethylene Terephthalate ◽  
Mechanical Test ◽  
Charpy Impact ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Particle Sizes ◽  
Structure And Properties ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Charpy Impact Strength

The blends of recycled poly (ethylene terephthalate) (r-PET)/thermoplastic polyester-ether elastomer (TPEE)/acrylic acid grafted low density polyethylene (LDPE-g-AA) were prepared by extrusion and injection molding. The mechanical, morphological and rheological properties of the blends were investigated by mechanical test, SEM and torque rheometer, respectively. The results show that the Charpy impact strength of the blends increases to the maximum when adding 3 wt % LDPE-g-AA and then decreases with the further increase of LDPE-g-AA contents, while the tensile strength of the blends decreases with the increase of LDPE-g-AA contents. The SEM shows that the particle sizes of TPEE in the blend containing 3wt% LDPE-g-AA become much smaller than that in the uncompatibilized blends, and a more uniform and better islands-in-sea morphology is obtained. Furthermore, the addition of LDPE-g-AA decreases the viscosity of the blends, leading to an overall improvement of processability. From these results above, it can be concluded that the introduction of LDPE-g-AA increases the compatibility and processability of r-PET/TPEE blends effectively.

Sign in / Sign up

Export Citation Format

Share Document