The compatibility of (natural) polyols with heavy metal- and zinc-free poly(vinyl chloride): Their effect on rheology and implications for plate-out

Es, Daan S. van; Steenwijk, Johan; Frissen, Guus E.; Kolk, Hans C. van der; Haveren, J. van; Geus, J.W.; Jenneskens, Leonardus W.

doi:10.1016/j.polymdegradstab.2007.10.016

Cited by 20 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although insufficient E420 replaced part of the active chlorine on the PVC chain in the mixing process, it deteriorated the compatibility of the composite stabilizer with PVC and plasticizer which inhibited the ability of PVC to absorb HCl. [29,30] The role of polyhydroxy became more prominent with the increase of E420 content, and "zinc burning" was completely inhibited, so the coloring of PVC was significantly improved. Excessive E420 deteriorated the compatibility of the PVC system, and significantly reduced its long-term thermal stability time and initial whiteness.…”

Section: Effect Of Dbm On the Performance Of Pvc With Dajmentioning

confidence: 99%

Preparation and performance of PVC long‐term heat stabilizer based on the synergistic effect of uracil and metal complexes

Zhang

Xia

Song

et al. 2022

Vinyl Additive Technology

View full text Add to dashboard Cite

In order to improve the deficiency of traditional polyvinyl chloride (PVC) heat stabilizer, triazole-based zinc-containing complex (abbreviated as [Zn(ttr) (OAc)]) with good compatibility with PVC and a strong ability to absorb HCl was prepared in this paper, which was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM) and thermogravimetric analysis (TGA). PVC sheets were prepared by mixing PVC with composite heat stabilizer (DAJ) composed of [Zn(ttr)(OAc)] and 1,3-dimethyl-6-aminouracil (DAU). Different kinds and amounts of common auxiliary heat stabilizers were selected and added to the DAJ system to study the effect of thermally stable system on PVC by Congo red test, Discoloration test, Dynamic thermal stability test, SEM, TGA and Transmittance test and the relevant mechanism was explored. The PVC sheets with DAJ blended by 1.2 phr DAU and 0.8 phr [Zn(ttr)(OAc)] showed relatively excellent coloring properties, long-term thermal stability, and high light transmittance. Compared with dibenzoylmethane (DBM), 0.5 phr sorbitol and 1.5 phr epoxy soybean oil (ESBO)/Antioxidant 168 showed good synergistic effect with DAJ. Due to the polyhydroxy nature of sorbitol, the thermal stability of PVC was significantly improved, and the transmittance of PVC benefited from the similar miscibility of ESBO long chain. This was also confirmed by TGA and SEM of PVC sheet.

show abstract

Section: Effect Of Dbm On the Performance Of Pvc With Dajmentioning

confidence: 99%

Preparation and performance of PVC long‐term heat stabilizer based on the synergistic effect of uracil and metal complexes

Zhang

Xia

Song

et al. 2022

Vinyl Additive Technology

View full text Add to dashboard Cite

show abstract

“…It is cost-effective, highly versatile and is used in many construction applications as water, sewage and drainage pipes, and a variety of extruded profiles (van Es et al, 2008). Though PVC is one of the most important commercial plastic materials but it is thermally unstable at processing temperature.…”

Section: Bangladesh Journal Of Scientific and Industrial Researchmentioning

confidence: 99%

Zinc stearate from galvanizing waste materials and its use as thermal stabilizer in PVC industries

Rony

Ray

Hoque

et al. 2016

Bangladesh J. Sci. Ind. Res.

View full text Add to dashboard Cite

Galvanizing industries of Bangladesh produce profuse amount of environmentally hazardous solid waste materials like zinc dross which contains significant amount of valuable zinc and harmful heavy lead. Zinc was extracted as zinc chloride (ZnCl 2 ) from zinc dross. Zinc stearate (ZnSt 2 ) samples were prepared by precipitation method from stearic acid, sodium hydroxide and ZnCl 2 by varying the amount of the reagents and product yield found within the range 96.06-99.18%. Characteristic peaks of ZnSt 2 were investigated by Fourier Transform Infrared Spectroscopy (FTIR). Differential Scanning Calorimeter (DSC) onset curve assigned accurate melting point within the range 122.84-124.03°C. Surface morphology of ZnSt 2 was observed by Scanning Electron Microscope (SEM) and products had semi-crystalline structure. Thermal stability of ZnSt 2 was evaluated by Thermo-gravimetric Analyzer (TGA) that complied with literature. A combination of ZnSt 2 and Calcium stearate (CaSt 2 ) at 1:1 ratio was used as thermal stabilizer in the powder commercial grade PVC resin and performed better thermal stability. The dehydrochlorination temperature of PVC with mixed stearates was 344.67±1.04°C for 10% (w/w) loading whereas for PVC, PVC with 10% (w/w) ZnSt 2 and PVC with 10% (w/w) CaSt 2 , it was 269.83±1.04°C, 317.33±1.26°C and 323.33±2.08°Crespectively.

show abstract

“…As an alternative heavy metal-free thermal stabilizers for PVC are usually used natural polyols; however, these additives cause excessive die plate-out. 117 To conclude this subsection, it should be mentioned that despite the fact that filled polymers are widely used in worldwide plastics extrusion there exists no deep fundamental scientific research work focused on die drool in such polymers.…”

Section: Filled Polymersmentioning

confidence: 99%

Historical Review of Die Drool Phenomenon in Plastics Extrusion

Musil

Zatloukal

2014

Polymer Reviews

View full text Add to dashboard Cite

Die drool phenomenon is defined as unwanted spontaneous accumulation of extruded plastics on die exit face(s) of extrusion die during plastics extrusion process. Such accumulated material builds up on die exit face(s) and frequently or continually sticks onto the extruded product and by this way reduces the quality of the product. When the die drool appears, the extrusion process must be shut down and the die exit face(s) must be manually cleaned, which is time consuming as well as money consuming.Die drool has been observed from the beginning of plastics extrusion and the first published remark about it was made in 1946. For a long time it was considered as only an engineering problem and even if a wide range of suppressing ideas based on modification of extrusion dies, plastics materials, and processing conditions have already been patented, its source remained unclear. During the last few years, a number of experimental as well as theoretical research papers focusing on its fundamental nature have been published. Nowadays, die drool is considered as a fundamental rheological phenomenon.The force which drives the building up of extruded plastics on die exit face(s) is negative pressure (suction) occurring in the die exit edge(s) region where the free surface of the extruded plastics is created. Moreover, two different die drool types (external and internal) exist. The formation mechanisms of external/internal die drool are based on negative pressure occurring in the die exit region together with deformation of free extrudate surface/material separation wherever inside the extrusion equipment, respectively. From the processing point of view, the internal die drool is much more problematic than the external one, primarily due to a higher build up rate and compact shapes of the accumulated drool mass. Two theories of internal die drool formation mechanism based on wall slip theories (flow-induced molecular weight fractionation and stress-induced cohesive chain disentanglement) have been recently proposed and tested.In this historically ordered review, breakthrough works in the field of die drool research are presented, many ways to suppress it are shown, techniques for its quantitative evaluation and experimental methods for its analytical investigation are introduced, external and internal die drool types are explained, and theories of external as well as internal die drool formation mechanism are presented and discussed in depth, which

show abstract

The compatibility of (natural) polyols with heavy metal- and zinc-free poly(vinyl chloride): Their effect on rheology and implications for plate-out

Cited by 20 publications

References 11 publications

Preparation and performance of PVC long‐term heat stabilizer based on the synergistic effect of uracil and metal complexes

Preparation and performance of PVC long‐term heat stabilizer based on the synergistic effect of uracil and metal complexes

Zinc stearate from galvanizing waste materials and its use as thermal stabilizer in PVC industries

Historical Review of Die Drool Phenomenon in Plastics Extrusion

Contact Info

Product

Resources

About