scholarly journals Impact of blowing agents in poly(vinyl chloride) cellular extrusion process

2017 ◽  
Vol 21 (1) ◽  
pp. 22-30
Author(s):  
Tomasz Garbacz ◽  
Ľudmila Dulebová
Keyword(s):  
Vinyl Chloride ◽  
Extrusion Process ◽  
Blowing Agents ◽  
Poly Vinyl Chloride

Study of the rheology and foaming processes of poly(vinyl chloride) plastisols with different foaming agents

2019 ◽  
Vol 39 (2) ◽  
pp. 117-123 ◽  
Author(s):  
Yubi Ji ◽  
Heng Luo ◽  
Min Shi ◽  
Zhao Yang ◽  
Wei Gong ◽  
...  
Keyword(s):  
Vinyl Chloride ◽  
Complex Viscosity ◽  
Mechanical Analysis ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Foaming Agents ◽  
Blowing Agents ◽  
Poly Vinyl Chloride ◽  
Chemical Blowing Agents

AbstractPoly(vinyl chloride) (PVC) plastisols are widely used in the production of flexible PVC foams. In this study, we investigated the evolution of the complex viscosity of PVC plastisol by dynamic oscillatory tests, the storage modulus of the PVC compound by dynamic mechanical analysis, and the thermal behavior including the decomposition of three chemical blowing agents (CBAs), namely, azodicarbonamide, 4,4′-oxybis(benzenesulfonyl hydrazide), and sodium bicarbonate, by differential scanning calorimetry. Furthermore, the morphology and quality of the foams obtained from the corresponding plastisols were characterized by scanning electron microscopy. The results indicated that the onset decomposition temperature T2(5%) of a CBA in plastisol is the most critical indicator of the foam quality. The temperature difference corresponding to [T2(5%) – Tηmax] was also proved to be another important parameter. When T2(5%) is within the optimum temperature range of a PVC plastisol, the bigger the [T2(5%) – Tηmax] difference, the better the quality of the foams.

The extrusion of plasticized poly(vinyl chloride) in an extruder with a modified feed zone. Part 1: extrusion process

2015 ◽  
Vol 35 (2) ◽  
pp. 191-198 ◽  
Author(s):  
Janusz W. Sikora ◽  
Bronisław Samujło ◽  
Andrzej Stasiek
Keyword(s):  
Vinyl Chloride ◽  
Experimental Studies ◽  
Extrusion Process ◽  
Screw Extruder ◽  
Pocket Depth ◽  
Single Screw Extruder ◽  
Poly Vinyl Chloride ◽  
Feed Zone ◽  
Process Energy ◽  
Opening Width

Abstract The work presents the results of experimental studies of plasticized poly(vinyl chloride) (PVC) extruded by a single-screw extruder with a modified feed section. The variable factors were the feed opening width, the feed pocket depth in the extruder barrel, and the rotational speed of the screw. The following parameters were studied: extrudate temperature Tw (°C), screw torque M (Nm), polymer mass flow rate G (kg/h), unit consumption of energy supplied to the extruder Ejc (J/g), and extrusion process energy efficiency κ (%). It was found that the increase in the depth of the pocket and the decrease in the width of the feed opening influence the extrusion process in a positive way.

Influences of Modified Chemical Blowing Agents on Foaming of Wood Plastic Composites Prepared from Poly(Vinyl Chloride) and Rice Hull

2011 ◽  
Vol 306-307 ◽  
pp. 869-873 ◽  
Author(s):  
Nawadon Petchwattana ◽  
Sirijutaratana Covavisaruch
Keyword(s):  
Sodium Bicarbonate ◽  
Vinyl Chloride ◽  
Rice Hull ◽  
Wood Plastic Composites ◽  
Blowing Agents ◽  
Blowing Agent ◽  
Maximum Reduction ◽  
Plastic Composites ◽  
Poly Vinyl Chloride ◽  
Chemical Blowing Agents

The influences of the types of chemical blowing agent (CBA) namely endothermic, exothermic and their mixture, on the properties of the foamed poly(vinyl chloride) (PVC) and rice hull wood plastic composites (WPC) were investigated in the current research. Specifically, azodicarbonamide and sodium bicarbonate were selected to represent the exothermic the endothermic CBA respectively. Particles of sodium bicarbonate and azodicarbonamide were modified with 25 wt% citric acid and 20 wt% ZnO respectively, and they were used at 0 to 3.0 wt%. Maximum reduction of density by 45% was achieved when the exothermic CBA was applied at 2.0% by weight. Overall, the flexural properties decreased as the level of the CBA was increased from 0-2.0 wt%, but there was an upturn when the CBA reached 3.0 wt%. The mixture of exo/endothermic CBA illustrated the mechanical properties averaged between their parents.

Effects of kaolin and maleic anhydride contents on melt elasticity and flexural behaviour of polypropylene/kaolin and unplasticised poly(vinyl chloride)/kaolin composites

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
A. Ariffin ◽  
Z.M. Ariff ◽  
S.S. Jikan
Keyword(s):  
Maleic Anhydride ◽  
Vinyl Chloride ◽  
Low Cost ◽  
Extrusion Process ◽  
Sem Analysis ◽  
Morphological Properties ◽  
Melt Fracture ◽  
Extrudate Swell ◽  
Melt Mixing ◽  
Poly Vinyl Chloride

AbstractPolypropylene/kaolin and unplasticised poly(vinyl chloride)/kaolin composites were prepared by directly melt mixing polypropylene (PP) and unplasticised poly(vinyl chloride) (UPVC) with maleic anhydride (MAH) and low cost kaolin via in situ extrusion process. The influences of kaolin particles and MAH in PP and UPVC matrix were discussed through investigating the flexural and morphological properties of filled PP and UPVC composites. The extrudates obtained from the extrusion process were carefully collected in order to investigate the elastic properties (extrudate swell and melt fracture). Results revealed that the above mentioned properties are strongly dependent on the presences of kaolin and MAH in both composite systems. Observation on scanning electron microscopy (SEM) analysis showed that the kaolin books (stacks of kaolin particles) were successfully delaminated thus lead to a well dispersed of kaolin particles in PP and UPVC matrix.

The impact of selected granulometric properties of poly(vinyl chloride) on the effectiveness of the extrusion process

2013 ◽  
Vol 33 (1) ◽  
pp. 77-85 ◽  
Author(s):  
Bronisław Samujło ◽  
Janusz W. Sikora
Keyword(s):  
Vinyl Chloride ◽  
Extrusion Process ◽  
Poly Vinyl Chloride ◽  
Unit Energy ◽  
Basic Parameters ◽  
Screw Diameter ◽  
Unit Energy Consumption ◽  
Pellet Density ◽  
The Impact ◽  
Polymer Unit

Abstract The article presents results of a study of the effect of selected granulometric features of plastified poly(vinyl chloride) granule on the basic parameters of extrusion. In the study, it was determined how mass polymer flow rate, power supplied to the extruder, power transmitted by the polymer, unit energy consumption, and energy efficiency of the extrusion process were related to pellet length and bulk pellet density. The tests were carried out using an extruder with a screw diameter of 25 mm and a length-to-diameter ratio of 25, and involved processing of pellets of different lengths at variable rotational speeds of the screw. It was established that the granulometric features of plastified poly(vinyl chloride) considered in this study, i.e., pellet length and pellet bulk density, affect the effectiveness of the extrusion process. It was shown that best effectiveness of extrusion is achieved with the use of a granule characterized by a pellet length that is close to the other characteristic dimension of granule – its pellet diameter.

Sign in / Sign up

Export Citation Format

Share Document