Blending AP230 with 2.5 and 5.0 wt % POO improves the VI from 104 to 162, while blending with PHO increases the VI up to 120. This is because a longer alkyl chain (e.g., POO) …

1. Introduction. Shear thickening fluid (STF) is a non-Newtonian fluid that exhibits an abrupt increase in viscosity by a few orders of magnitude with increasing shear rate [1,2,3].STF behaves as a solid-like material under applied stress due to increasing viscosity, and when the loading is removed from the medium, the STF turns to the initial …

Understanding shear thickening in colloidal suspensions is of great practical importance. Hsu et al. create responsive polymer-coated silica particles whose rheology can be tuned in situ ...

Polyglykol P41/3000. Polyglykol P41/3000 is a water-soluble polyalkylene glycol (PAG) to be used as thickener in fire-resistant hydraulic fluids and in water-based quenchants. Clariant is one of the world's leading suppliers of water-soluble polyalkylene glycols used as thickeners and quenching polymers.

There is a growing demand to understand the shear thickening mechanism to explain the mechanical behavior of STF in different applications. Thus, this review discusses five different shear thickening mechanisms, i.e., order-disorder theory, hydro-clustering theory, dilation theory, jamming theory, friction contact theory.

The use of polymers as independent thickeners for lubricating greases provides an alternative to the widely used lithium thickeners. This underlines the …

thickness in typical gear sets at operational temperatures, temperature reduction and energy efficiency. The results (seen in the illustrations above) reveal that OGLs with PPs …

Shear thickening fluids (STFs) are dense colloidal suspensions exhibiting an abrupt increase in viscosity with increasing shear rate [1], [2], [3], [4]. The main favorable …

As polymer additives are one of the most expensive components of a lubricant formulation, it is highly desirable to develop additives with high thickening efficiency. Moreover, polymeric additives undergo mechanical shear-induced chain breaking reactions, which determine a decrease of the lubricant viscosity.

Carbopol® ETD 2623 polymer It was designed to impart thickening, stabilizing, and suspension properties to a wide range of household applications. Carbopol ETD 2623 polymer was designed for use as a versatile rheology modifier in surfactant-based formulations where longer flow, enhanced ease of use, and electrolyte tolerance are key …

HiTEC ® 7389. Thickeners and viscosity index improvers are polymeric, and are added to reduce lubricant viscosity changes at high and low temperatures. Mineral oil lubricants become less effective at high temperatures because heat reduces their viscosity and film-forming ability. The traditional solution to this problem was to make seasonal ...

OCP VMs are primarily made of ethylene and propylene monomer units and are synthesized via Ziegler–Natta vanadium-based or metallocene catalysis [32, 33]. Variations in … See more

The chemistry, manufacture, dispersancy and utility of each class are described. The comparative functions, properties, thickening ability, dispersancy and degradation of VIIs are discussed. ... J.P.R. (1983) Degradation of polymers in multigrade lubricants by mechanical shear. Polym. Degrad. Stab. 5 425-447. Article CAS Google …

Here, linear polymer-based liquid lubricants were designed via a strategy of complementary advantages, by esterifying the hydrogenated hydroxyl-terminated …

SH-0178. Enjoy the rich, creamy foam of this sulfate-free** shampoo with natural extracts thought to maintain a healthy scalp and fullness of hair. The soothing visual aesthetics and flow are provided by Arbalon ® R-50 cellulose liquid and Schercemol™ LL ester in combination with Quickpearl™ PSB3 pearlizing agent. Merquat™ 3940 polymer ...

It is produced from a high quality, tallow derived fatty acid for grease, lacquer and polymer applications requiring a finely divided powder with good... view more. Calcium-12-Hydroxystearat by Baerlocher acts as a thickening agent. It is a calcium based hydroxy stearate. It acts as a lubricant and release agent.

The thickening efficiency is defined by the amount of polymer needed to increase kinematic viscosity and is often recorded as the kinematic viscosity of a blend of a polymer-containing product at a certain weight percent in a standard base oil. For shear stability, most oil and lubricant analysis measure and report the kinematic viscosity ...

How do shear-thickening, energy-absorbing materials actually work? A simple explanation. Shear-thickening plastics are gels, with long-chain polymers suspended in a liquid lubricant that lets them flow smoothly past one another at slow speeds. Coax them slowly and the chains have plenty of time to slither about, like …

Viscosity Modifiers. Viscosity Modifiers (VM) are used to reduce the influence of temperature on the viscosity of lubricants. Also known as Viscosity Index Improvers (VII) VMs used in crankcase lubricants are polymers. VMs are used in the majority of engine oils and many transmission oils. Viscosity Modifiers.

Progress. The Carbopol® polymer family is based on crosslinked acrylic acid chemistry. This technology provides highly efficient thickening and excellent clarity, suspending power and emulsion stability. As the inventor of this technology, Lubrizol has a team full of technical resources that deeply understand its use in formulating for ...

Lubricant oil performance is critical for machinery and engine longevity in a wide range of industrial and commercial applications [].The viscosity index (VI) is a key parameter that evaluates the effectiveness of lubricant oils, representing the degree of viscosity change as a function of temperature [].Polymer viscosity index improvers (VIIs) …

Section snippets Greases for thickener structure analysis, rheological characterisation, and bearing testing. The polymer grease used in this study was synthesised by following the general scheme of dissolving polypropylene in base oil at 180–200 °C, followed by rapid cooling to 80 °C or below in less than 30 s.Through the …

Carbopol ® Fusion S-20 polymer is an inherently biodegradable rheology modifier that provides thickening, suspension and clarity similar to acrylates copolymer and is ideal for skin cleansing and hair care applications. It is also the first Carbopol ® polymer to address all 12 Principles of Green Chemistry in its manufacturing process.

It is known that the disperse phase for polymer lubricants can cover a wide range of polymers, copolymers, and their mixtures [3,4,5,6,7,8].Polypropylene of various molecule weights is of greatest scientific and practical interest among the polymers of nonpolar structure that have been investigated as independent thickeners for lubricating …

The addition of a small optimum quantity of polymer based VII, which possesses viscosity thickening power [3,4] as a result of its high molecular weight [5,6], is able to minimize viscosity variation over a wide temperature range, increase the viscosity index (VI), improve the quality, and broaden the application temperature range of …

Lubricant Performance. Our primary goal was to test the performance of these polymers/oligomers as viscosity index improvers. In addition, the relatively high density of heteroatoms was expected ...

Effect of polymer structure and chemistry on viscosity index, thickening efficiency, and traction coefficient of lubricants

What is a Performance Polymer? PPs are a versatile class of polymers . with unique architecture that offer supe-rior thickening efficiencies, low trac-tion coefficients and high shear stabil-ity. Depending on the end use applica-tions, PPs can be used both as viscosity . Lowering the Temperature of Gear Oils . with Performance Polymer Technology

Hydrophobic-associated polymer is widely used as thickener in the presence of Ca2+ or Na+. Three polymers including partially hydrolyzed polyacrylamide (HPAM) and hydrophobically associating polymers (CHAP and CBHAP) were used to clarify the thickening mechanism. The fractal aggregation process, microstructure and …