associative thickener mechanism

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Technical Background Rheological Additives - TEGO

duce a network (fig. 5). Although the simplified model in fig. 5 is helpful in explaining associative thicken- ing clearly, the actual mechanisms of thickening by polyurethane thickeners are more complex. Investigations on solutions of polyur- ethane thickeners in water show that the thickener molecules are present in mono-.

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New Associative Thickeners and Their Use In Waterborne and High ...

The strengths and weaknesses of traditional thickeners are summarized in Table 1.1. In this article, the mechanisms, properties and applications of polyurethane associative thickeners in waterborne coatings will be addressed. Furthermore, a new class of associative thickeners, identified as solventborne associative...

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Preparation of Associative Polyurethane Thickener and Its ... - Hindawi

Sep 17, 2015 ... Associative PU thickeners have become one of the most important research areas in the additives of waterborne coatings. In addition, the molecular structure and thickening mechanisms of associative polyurethane thickeners are completely different from the traditional thickeners, and their rheological...

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A guide to understanding and mixing thickeners - Ross Mixers

form, an associative thickener is a water-soluble polymer containing several relatively ... HEUR's also belong to the category of associative thickeners. But ... mechanisms. Addition of alkali to an emulsion consisting of tightly coiled polymers generates anionic charges along the chains. Like charges repel each other and the.

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Syneresis and Rheology Mechanisms of a Latex-HEUR Associative ...

SYNERESIS AND RHEOLOGY MECHANISMS OF A LATEX-HEUR. ASSOCIATIVE THICKENER SYSTEM. A Project Report presented to the Faculty of California Polytechnic State University,. San Luis Obispo. In Partial Fulfillment of the Requirements for the Degree. Master of Polymers and Coatings Science by.

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Part A: THE USE OF NONIONIC ASSOCIATIVE POLYMERS FOR ...

The use of nonionic associative thickeners was proposed for personal care applications. ... thickener. There appeared to a clear effect of salt on the thickening and emulsifying capabilities of the nonionic associative polymers but the exact interaction was ..... They thicken by mechanisms of chain entanglement, hydrodynamic.

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Rheology Modifiers - BASF Dispersions & Pigments

cellulosics, polyacrylates or polyurethanes. Associative rheology modifiers: thickening by non-specific interactions of hydrophobic end-groups of a thickener molecule ... associative thickeners (HEUR, HMPE) as well as specialty clays. ..... Figure 19: Working mechanism of Efka® RM thixotropes in solvent-based coatings and.

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Acusol Rheology (US) - The Dow Chemical Company

ACUSOL™ ASE polymers thicken via a non-associative mechanism. Non- associative rheology modifiers do not interact with surfactant structures, particulates or insoluble emulsion droplets. (see illustration below). Non-associative polymers thicken by structuring the continuous phase and through chain entanglement.

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Thickeners + Rheology Guide - Scott Bader

Rheology is defined as the study of the deformation and flow of materials. When a force is applied to a liquid, the liquid will flow to relieve the strain from this force. Different systems will resist this flow more than others and the measurement of this resistance is a measure of the viscosity of the system. Newton first introduced...

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Syneresis and rheology mechanisms of a latex-HEUR associative ...

Aug 18, 2016 ... This study focuses on the phase behavior, rheology, and interactions of polymer latex particles and a hydrophobically modified ethoxylated urethane (HEUR) associative thickener in water. At constant...

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Rheology Modifier

conflict, a new category of HEUR thicken- ers has been ... Associative rheology modifiers are designed to thicken ... formulation pH. The pKa is the pH at which half of the amine groups are ionized. Since the thicken- ing mechanism of acid-suppressed HEURs is pH- triggered, the pKa of the hydrophobic amine must be such...

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Rheological Additives in Cosmetics - Elementis Specialties

based and Polyether Polyol based associative thickeners with superior performance in difficult systems such as those containing high salt levels or with extremes in ph. Due to its structure, RhEoLuxE® is soluble in water, but associates with lipophilic materials to build viscosity. Associative thickeners – mechanism of action.

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Download Note - TA Instruments

spatter resistance and leveling to the paint. Associative thickeners are low molecular weight, water soluble polymers like modified alkali swellable emulsions, and provide overall good performance to a waterborne coating. CROSSLINKING MECHANISMS OF ASSOCIATIVE. THICKENERS [1]. In a water-based system, water...

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HEUR - What does HEUR stand for? The Free Dictionary

Surfactants can provide nucleation sites to facilitate the hydrophobes from two different associative thickeners to build the viscosifying mechanism at low HEUR levels. Dispersion phase diagrams for HEUR-thickened acrylic paint systems. HEUR and PEPO thickening mechanisms are based on interaction and association...

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Alkali-Swellable and Alkali-Soluble Thickener Technology ...

Jul 22, 2009 ... These thickeners are broadly classified as either conventional (presumably nonassociative) or associative, depending on their chemical architecture and dominant mechanism of thickening. ASTs prepared by emulsion polymerization and supplied in latex form have received the greatest commercial...

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Thickeners (Rheology Control Agents) | PRODUCTS BY FUNCTION ...

The thickening mechanism is illustrated in the figure below where through hydrophobic interaction, the hydrophobic parts of the thickener assemble with itself or other hydrophobic substances, such as resin, to form a net-like structure and thicken the liquid. The nature of associative thickeners changes significantly with the...

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Thickening agent - Wikipedia

A thickening agent or thickener is a substance which can increase the viscosity of a liquid without substantially changing its other properties. Edible thickeners are commonly used to thicken sauces, soups, and puddings without altering their taste; thickeners are also used in paints, inks, explosives, and cosmetics.

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Organic Thickeners for Water-Borne Paints - Ingenta Connect

Keywords: Associative thickeners · Cellulose · Paint additives · Polyurethane · Thickeners. 1. ... Organic thickeners. • Inorganic thickeners. Organic thickeners are used in both water-borne and solvent-borne coatings. Main representatives are cellulose deriv- .... Thickening mechanism: cellulose thickener, pigment and binder...

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Thickening properties and emulsification mechanisms of new ... - NCBI

J Colloid Interface Sci. 2005 Feb 15;282(2):448-57. Thickening properties and emulsification mechanisms of new derivatives of polysaccharides in aqueous solution. Akiyama E(1), Kashimoto A, Fukuda K, Hotta H, Suzuki T, Kitsuki T. Author information: (1)Kao Corporation, Tokyo Research Laboratory, 2-1-3, Bunka,...

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Mechanism of alkali thickening of acid‐containing emulsion ...

Abstract. Viscosity-versus-pH relationships for a large number of methacrylic acid-containing emulsion polymers have been measured. The monomers chosen for this study were so selected because they represent synthesized latexes of high and low Tg and comparative hydrophilicity. These were styrene, methyl...

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Shear and elongational flow behavior of acrylic thickener ... - mvm kit

thickener solutions. Part I: Effect of intermolecular aggregation. Saeid Kheirandish · Ilshat Guybaidullin ·. Wendel Wohlleben · Norbert Willenbacher. Received: 4 February 2008 / Accepted: 26 April 2008 .... to the so-called associative thickeners which tend to .... tion mechanism of the FFF channel is then a function only of the...

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Hydrophobically Modified Polymers. Rheology and ... - Lund University

Jan 1, 2002 ... pronounced effect on paint viscosity. This is due to the thickening mechanism of the associative thickeners that to a large extent is dependent on associations between the hydrophobic groups on the thickener, since these also associate with other ingredients in the paint. The associations are very sensitive...

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Shear thinning and thixotropy of HMHEC and ... - Semantic Scholar

Thickeners traditionally used were water-soluble derivatives of cellulose, such as hy- droxyethyl celluloses of high molecular ... information about the thickening mechanism. However, it is not useful for ... Besides being shear dependent, a large number of associative polymers are thixotropic. Kästner 2001; Vittadello and...

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Performance Additives for Waterborne Systems - Elementis Specialties

A strong hydrophobically modified alkali swellable acrylic thickener that demonstrates both ionic and associative thickening mechanisms with an excellent balance of the respective properties. This provides both mid and high shear rate viscosity with balanced performance forsuperior package and application properties.

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Effect of synthetic modifiers on the rheology of coating ... - Theseus

May 25, 2015 ... The polymer chains adsorb on the surface of the pigment particles. The particles are then crosslinked by bridging mechanism. The increased viscosity is a result of cross- linking. [26, pp. 259]. 5.4.2 Associative thickeners. While the associative thickener is hydrophilic and water soluble, the hydrophobic termi...

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Lifetime and network relaxation time of a HEUR-C20 associative ...

Jenkins, R. D.,“The fundamental thickening mechanism of associative polymers in latex systems: A rheological study,” Ph.D. thesis, Lehigh University, Bethlethem, PA, 1991. ... Jenkins, R. D., C. A. Silebi, and M. S. El-Aasser, “Steady shear and linear viscoelastic properties of associative thickener solutions,” Polym. Mater.

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Types and Advantages and Disadvantages of Thickeners in ...

Oct 18, 2017 ... A lot of thickener varieties are available on the market currently, mainly inorganic thickeners, cellulose, polyacrylate and associative polyurethane thickener four ... Associated polyurethane thickeners have many properties over other thickeners, but due to their unique micellar thickening mechanism, the...

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Three Challenges of Formulating with Mild Surfactants | Prospector ...

Jul 1, 2016 ... To achieve viscosity, the main existing thickening technologies on the market are conventional thickeners or associative thickeners. Conventional ... gum or cellulose esters. The mechanism of thickening comes from chain entanglement, hydrodynamic volume and flocculation of dispersed components.

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The Role of Thickeners in Optimising Coating Formulations

Oct 28, 2015 ... 150 years Associative rheology modifiers Thickening mechanism of HEUR Micelle Surfactants Latex particle Mixed Micelle How to study the interaction between colloid particles and the rheology modifier? 15. 150 years Interactions between latex and rheology modifier Electrophoretic mobility -4 -3 -2 -1 0 1...

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Coating Rheology - Werner

Viscosity (cps) Consistency. Air. 1.00E-03. Gaseous. Water. 1.00E+00. Fluid. Olive Oil. 1.00E+02. Liquid. Glycerine. 1.00E+03. Liquid. Golden Syrup. 1.00E+05. Thick Fluid. Polymer Melts 1.0E+05 - 1.0E09. Toffee-Like. Pitch. 1.00E+12. Stiff. Glass. 1.00E+24. Rigid. 1000 cps = 10 poise = 1 Pa s...

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US7803864B2 - Associative thickener compositions and methods of ...

A method for improving the viscosity stability of an aqueous composition having a latex polymer and associative thickeners with at least one hydrophilic segment and at least two hydrophobic segments is provided. The associative thickeners are chosen such that one associative thickener has a lower molecular weight than...

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1100 Series - Associative Thickeners - DeCAL Grades | Speciality ...

The DeCAL 1100 Series of associative thickeners are used where improved flow is desirable, for example in alkaline water-borne decorative coatings. ... added at the final stage of coating manufacturing, not in the pigment grinding stage as unrecoverable damage to the thickening mechanism can occur at high shear stress.

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POSTER: Refreshing Cleansing - Lubrizol

Aqua polymers and NaCl. NEW GluCAMATE™ VlT THICKENER. INCI Name: PEG-120 Methyl Glucose Trioleate (and) Propanediol. Glucamate™ VLT thickener builds viscosity in surfactant systems through an associative mechanism (Figure 6). FIGURE 6: Associative thickening mechanism of Glucamate™ VLT thickener.

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US6602948B2 - Method of reducing syneresis in aqueous ... - Google

The HEUR thickeners are referred to as “associative thickeners” because the mechanism by which they thicken involves forming hydrophobic associations between the hydrophobic moieties in the thickener molecules and other hydrophobic surfaces, including other thickener molecules, pigments or latex particles. It is this...

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Synthesis and Properties of Hydrophobically-Modified Ethoxylated ...

The hydrophobically- modified ethoxylated urethane associative thickeners( HEUR) were synthesized by the reaction of prepolymer and 1,6-hexanediol as chain extender,further terminated by long- chain alkyl alcohol,wherein,the prepolymer was prepared from diisocyanate and polyethylene glycol. The structure of HEUR...

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New Insights into the Mechanism of Mobility Reduction by ...

Abstract New thickeners based on associative properties and their application in enhanced oil recovery are discussed. The new thickeners are anionic, water-soluble, hydrophobically modified copolymers. The rheological properties as well as the flow.

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Radiation Curable Additives Enabling Excellent Paint Surfaces

Surface tension effects drive two different mechanisms of flow: 1. To minimize the surface area of a .... Associative cellulose ethers. Associative acrylic thickeners. PUR - Thickener. Montmorillonite. Hectocrite. Silica. MODAFLOW® , CYXinhai®, ADDITOL®. Page 34. Associative Thickeners – Mechanism. ADDITOL® VXW 6360...

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Rheological Additive Selection For Printing Inks - Covering the ...

Abstract: The various types of rheology modifiers used in inks are reviewed from the point of their chemical composition, mechanism and application .... Associative Thickeners ... The thickeners interact with pigment and emulsion particles and form a continuous network throughout the system and increase viscosity. (Figure...

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Developments in acrylic - based thickeners as substitute of ... - NOPR

Keywords: Acrylic thickener, Emulsion thickener, Kerosene emulsion, Pigment printing. Synthetic thickener. 1 Introduction. Unlike printing with fibre-affinitive dyes, the pigments are fixed to the .... Associative monomer. MMA. BA. BA. Aam. MMA .... reaction mechanism, latex stability and properties of final product are greatly...

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Thickeners + Rheology Guide - Palmer Holland

Rheology is defined as the study of the deformation and flow of materials. When a force is applied to a liquid, the liquid will flow to relieve the strain from this force. Different systems will resist this flow more than others and the measurement of this resistance is a measure of the viscosity of the system. Newton first introduced...

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