Effects of BaSO<sub>4</sub>, CaCO<sub>3</sub>, kaolin and quartz fillers on mechanical, chemical and morphological properties of cast polyurethane

Shahzamani, Mahnaz; Rezaeian, Iraj; Loghmani, M. S.; Zahedi, Payam; Rezaeian, Ali

doi:10.1179/1743289811y.0000000035

Cited by 14 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1.2 mol L −1 , a reactant feed flow rate of 10.42 m s −1 , and an impingement angle of 60°. 19,20 A suspension of nano-barium sulfate of known solid content was poured into a fournecked flask. A constant temperature water bath was adjusted to the experimental temperature and heated.…”

Section: Discussionmentioning

confidence: 99%

“…Nano-barium sulfate with particle size of 30 nm was prepared using an impingement flow reactor with a feed cross-sectional area of 1.56 mm 2 , a reactant concentration of 1.2 mol L −1 , a reactant feed flow rate of 10.42 m s −1 , and an impingement angle of 60°. 19,20 A suspension of nano-barium sulfate of known solid content was poured into a four-necked flask. A constant temperature water bath was adjusted to the experimental temperature and heated.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A study on the modification of nano-barium sulfate using a grafting method

Liu,

Li,

2023

Journal of Chemical Research

View full text Add to dashboard Cite

In this paper, the wet modification method is compared with the grafting method to modify nano-barium sulfate. The effects of the modification method, the modification time, the modifier dosage, the modification temperature, and other factors on the degree of activation of modified nano-barium sulfate are investigated to solve the nano-barium sulfate agglomeration problems and to make it a suitable process for industrial production. Thermogravimetric analysis, infrared spectroscopy, and scanning electron microscopy are used to characterize the morphology and encapsulation of modified nano-barium sulfate. The grafting method is used to modify nano-barium sulfate with a modification time of 120 min, a modifier dosage of 27%, and a modification temperature of 80 °C. From the experimental results, a hydrophobic nano-barium sulfate in powder form with 76.86% activation degree and 77.41% oil absorption value is obtained.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

A study on the modification of nano-barium sulfate using a grafting method

Liu,

Li,

2023

Journal of Chemical Research

View full text Add to dashboard Cite

show abstract

“…Morphological examination of the foam revealed that the cell geometry characteristics exert a significant influence on the observed mechanical characteristics. M. Shahzamani et al [16] proposes the the mechanical, chemical and morphological properties of cast polyurethane samples containing barium sulphate, Brazilian Journal of Development, Curitiba, v.10, n.1, p. 1605-1622, jan., 2024 calcium carbonate, kaolin and quartz fillers were investigated. And the results of mechanical property tests, such as tear resistance, tensile strength, elongation at break, hardness and abrasion resistance, were evaluated.…”

Section: Related Workmentioning

confidence: 99%

Variable pressure foaming on functionality and structural properties correlation in flexible polyurethane foam

Singh,

Gopalasamudram,

Maitra

2024

Braz. J. Develop.

View full text Add to dashboard Cite

The production cost of flexible polyurethane foam is significantly dependent on the cost of polyol, which constitutes the largest percentage of materials used in foam production with the characteristics to induce superior mechanical properties. Suitable fillers that are relatively cheap can be introduced in the foam as replacement for polyol. Certain compositions of filler have deleterious effect on some relevant mechanical properties of the foam. This paper investigates the Effects of Variable Pressure Foaming on functionality and structure property correlation in polyurethane foam using different percentage of inorganic fillers at different pressure in flexible polyurethane foam for the dual purposes of achieving sustained mechanical properties of polyurethane foam and reduction in the production cost by using the VPF Technique. Government restricts the use of certain auxiliary blowing agents like chlorofluorocarbon, trichloroethane, carbon dioxide, methylene chloride, acetone, pentane and water. VPF machine, in which we can make different densities of foam without adding auxiliary blowing agents which are banned in the Europe and other countries. These blowing agents are highly carcinogenic and ozone depletors, which are also harmful for human beings’ health and greenhouse effect. Water is a natural blowing agent, producers have tried to raise the water level substantially as an ABA agent, With the high exotherm associated with high water level formulations, there is so much urea formation that it is difficult to make flexible PU foams and inferior foam quality and durability, scorching in the foam and pose a fire hazard during foam manufacturing. For the rapid cooling process, it required excess Toluene Diisocyanate usage and allowed excess TDI vapour to be released into the atmosphere. In VPF, enclosed chamber and the exhaust is vented through carbon beds, it filters the TDI fumes which are very harmful for human beings’ health and for the environment. Foams can be achieved by foaming under vacuum, thus substantially reducing the water level and TDI usage. VPF technique offers a unique combination of environmental friendliness, superior product consistency and unique foam properties. It provides us with a platform for new product technology and a reliable process to meet the increasingly stringent environmental regulations.

show abstract

“…Most of them are iron-rich metal oxides (with prevailing Fe along with variable amounts of Zn, Cu, Cr, Mn, Ni; Figure A1), others are silicates (mainly mica and feldspar grains; Figure A1), while some granules consist of barium sulfate. All these particles are ascribed to the fillers used to regulate and improve rubber properties such as wet grip and rolling resistance of the tire treads (e.g., [34][35][36]). Rubber is the most widespread material within the MM line as the tire tread of the wheels of both the cabins and the braking system are made of rubber.…”

Section: As a Source Of Pmmentioning

confidence: 99%

Characteristics and Extent of Particulate Matter Emissions of a Ropeway Public Mobility System in the City Center of Perugia (Central Italy)

et al. 2021

View full text Add to dashboard Cite

Minimetrò (MM) is a ropeway public mobility system that has been in operation in the city of Perugia for about ten years to integrate with urban mobility and lighten vehicular traffic in the historic city center. The purpose of this work was to evaluate the impact of MM as a source of pollutants in the urban context, and the exposure of people in the cabins and the platforms along the MM line. These topics have been investigated by means of intensive measurement and sampling campaigns performed in February and June 2015 on three specific sites of the MM line representative of different sources and levels of urban pollution. Stationary and dynamic measurements of particle size distribution, nanoparticle and black carbon aerosol number and mass concentrations measurements were performed by means of different bench and portable instruments. Aerosol sampling was carried out using low volume and high-volume aerosol samplers, and the samples nalysed by off-line methods. Results show that MM is a considerable source of atmospheric particulate matter having characteristics very similar to those of the common urban road dust in Perugia. In the lack of clear indications on road dust effect, the contribution of MM to the aerosol in Perugia cannot be neglected.

show abstract

Effects of BaSO₄, CaCO₃, kaolin and quartz fillers on mechanical, chemical and morphological properties of cast polyurethane

Cited by 14 publications

References 29 publications

A study on the modification of nano-barium sulfate using a grafting method

A study on the modification of nano-barium sulfate using a grafting method

Variable pressure foaming on functionality and structural properties correlation in flexible polyurethane foam

Characteristics and Extent of Particulate Matter Emissions of a Ropeway Public Mobility System in the City Center of Perugia (Central Italy)

Contact Info

Product

Resources

About

Effects of BaSO4, CaCO3, kaolin and quartz fillers on mechanical, chemical and morphological properties of cast polyurethane

Cited by 14 publications

References 29 publications

A study on the modification of nano-barium sulfate using a grafting method

A study on the modification of nano-barium sulfate using a grafting method

Variable pressure foaming on functionality and structural properties correlation in flexible polyurethane foam

Characteristics and Extent of Particulate Matter Emissions of a Ropeway Public Mobility System in the City Center of Perugia (Central Italy)

Contact Info

Product

Resources

About

Effects of BaSO₄, CaCO₃, kaolin and quartz fillers on mechanical, chemical and morphological properties of cast polyurethane