Aqueous dispersions of polyurethanepolyvinyl pyridine cationomers and their application as binder in base coat for leather finishing author links open overlay panel saimani sundar a narasiman vijayalakshmi a sanjeev gupta b r. A new approach for hydrophobic modification and crosslinking, colloid polymer science 283, 209 218. The effects of the molar ratio of dpsabdsa on the properties of the. Chain extension study of aqueous polyurethane dispersions. Modification of aqueous polyurethane dispersions by. Synthesis, characterization and properties of waterborne. Polyurethane dispersions polyurethane dispersions can be safely handled when simple precautions are understood and followed. In the field of aqueous based polyurethanes, polyurethane dispersions, we are perhaps the pioneers in india, that complete the chain of manufacturing the puds, from the designing and synthesis of the backbone polyol, to the finished product customized for end use application. Polyurethane dispersions s1400 aqueous polyurethane dispersions snps s1400 series contains a complete range of 1k water based aliphatic polyurethane products, which can be used in many different industries and applications. The lower chain mobility of the polyurethanes from dmba leads to their high performance. Most conventional pu dispersions are high molecular weight ionic polymers which are commonly prepared by one of two processes. The main application areas of puds include adhesives. A number of aqueous polyurethane dispersions based on polytetramethylene glycol ptmg, 1,4butanediol 1,4bdo, dimethylol propionic acid dmpa and diisocyanates of. Waterbased polyurethane dispersions market 2019 to 2024.
The complex hydrophilic chainextending agent consisted of dpsa and bdsa. Innovative aqueous dispersions for use in coating applications. Water based polyurethane dispersions, elastomeric, anionic. Pdf biobased materials for polyurethane dispersions. Pu dispersion water based coatings water borne coatings. A comparative study of polymerization processes barni 2003 journal of applied polymer science wiley online library. Synthesis and properties of aqueous polyurethane dispersions.
Improved aqueous anionic polyurethane dispersions with a high crystallization rate, low heat activation temperature, high green strength, stability at low ph, which show good compatibility with other water based polymers and with crosslinkers. Norwalk ct abstract polyurethane dispersions are being used increasingly in industrial applications. Aqueous dispersions of polyurethanepolyvinyl pyridine. Alcoholamines were used as endcappers to prepare hydroxylterminated polyurethane aqueous dispersion. This paper starts with the chemistry and the general composition of standard puds and subsequently urethaneacrylic hybrid dispersions are presented with special emphasis on the relation between. The effect of the emulsifiers and their ratios on the polyurethane properties were investigated. Aqueous polyurethane dispersions pud are fullyreacted polyurethane systems produced as small discrete particles, 0. Table 3 displays the general characteristics of the waterborne polyurethane dispersions thus synthesised.
Nov 28, 1995 the novel aqueous polyurethane dispersions are obtainable from the aqueous polyurethane dispersions which can be prepared as described above and contain only the component a, for example by adding to them effective amounts of at least one polymer b, if necessary at elevated temperatures, and bringing the ph to the required value. The relationship between solid content and particle size. As conventional polyurethane is insoluble in aqueous media, for making it dispersible in water, ionic andor non. An aqueous polyurethane dispersion comprising at least one isocyanate terminated polyurethane. The polyurethane is the reaction product of an isocyanate terminated polyurethane prepolymer, and a chain extender. An aqueous chemically resistant self crosslinking aliphatic polyurethane dispersion with high hardness and clarity. Developments in aqueous polyurethane and polyurethane. Pdf the waterborne polyurethane dispersions based on. In order to comply with current environmental legislation and to maintain competitiveness, most companies rely on the use of waterborne polyurethane dispersions puds. Polyurethane dispersions are aqueous based systems consisting of pu particles ranging from 50nm to 500nm in diameter, frequently with some additional organic solvent present. Our aqueous polyurethane dispersions are very versatile and are used in a diverse array of applications including interior automotive plastics, concrete and wood flooring, roof coatings, leather and textiles. Aqueous polyurethane dispersion based on a special polyether for highquality coatings, such as wood, building, parquet floor lacquers. This work describes the reaction of chain extension step chain extended reaction as the variation of residual nco group and subsequent wt.
Modification of aqueous polyurethane dispersions by polybutadiene s. Aqueous polyurethane dispersions used in adhesives for manufacturing laminate structures are provided with improved dispersion properties, which provide improved shelflife stability of the dispersion and greater transparency and handling characteristics in application machinery for adhesives formulated therefrom, when a tertiary amine is present during an initial polyurethane prepolymer. Pdf preparation and properties of aqueous polyurethane. An aqueous pud is a binary colloid system in which polyurethane particles are stabilized and dispersed in a continuous aqueous medium. Japan aqueous polyurethane dispersion market industry. Films were prepared by casting the aqueous dispersions on levelled. The films were prepared by casting the aqueous dispersions onto a teflon plate at room temperature, followed by drying for 3 days. Alberdingk boley waterbased polyurethane dispersions alberdingk waterbased polyurethane dispersions are based on polyether, polyester, polycarbonate and natural castor and linseed oil polyols for high quality surface coatings. Pdf three waterbased polyurethane dispersions pud were synthesized by modified. The aqueous anionic polyurethane dispersions have high heat resistance after curing or blending with a crosslinker.
The rheological properties of these environmentally friendly dispersions were found to be. Dispersions for the adhesive industry innovative raw materials for numerous applications. Synthesis, characterization and properties of waterborne polyurethanes based on two different ionic centers hengameh honarkar, mohammad barmar, and mehdi barikani polyurethane and advanced polymers department, faculty of science, iran polymer and petrochemical institute, tehran 14977 115, iran. Aqueous polyurethane dispersions were prepared from. The chemistry of the polyurethane dispersion will dictate the performance properties.
Rheological behavior of aqueous polyurethane dispersions. Jan 30, 2015 water based polyurethanes dispersionspuds are one of the most growing segment for the surface coating industry due to their technological advances, that has made them an effective substitutes. Study of ionicnonionic polyurethane dispersions with high. Introduction water based polyurethanes dispersionspuds are one of the most growing segment for the surface coating industry due to their technological advances, that has made them an effective. Various papers and patents show that an amine chain extender with more than two functionalities such as. Aqueous polyurethane pu dispersions have been widely used in coatings and adhesives mainly due to environmental considerations. Request pdf preparation and properties of aqueous polyurethane dispersions waterborne polyurethane as a new polymer dispersion was synthesized by. Preparation and characterization of aqueous polyurethane. Custom polyurethane dispersions lynn, massachusetts hauthaway. Synthesis and properties of anionic aqueous polyurethane dispersions article in journal of applied polymer science 8614.
Aqueous polyurethane dispersions puds have recently emerged as important alternatives to their solventbased counterparts for various applications due to increasing health and environmental awareness. Aqueous dispersion adhesives of anionic polyurethanes which have high heat resistance and low activation temperature, even when employed without addition of a crosslinker. Mar 31, 2005 rheological behavior of waterborne polyurethane dispersions was investigated with smallamplitude oscillatory shear flow experiments over wide ranges of concentration, degree of neutralization, chain extension, and temperatures to accelerate efforts to understand their film formation characteristics. Jun, 20 it has been found that the object can be achieved through use of the polyurethane adhesive dispersions described hereinafter. Methods to improve the relatively poor water and solvent resistance of aqueous polyurethane dispersions which is introduced by the hydrophilicity and linear structure of polyurethane have been discussed with an emphasis on acrylate incorporations. A novel contribution to the modeling of the matting.
Water dispersions of polyurethanes are successfully replacing solv. Preparation and properties of aqueous polyurethane. Stable aqueous dispersions were obtained by dropwise addition of water to the reaction mass by using peristaltic pump coupled with high shear stirring. Material safety data sheets msds or sds for polyurethane dispersions are available from the dow chemical company. Custom polyurethane dispersions lynn, massachusetts. The pu particles typically comprise from 30 to 45 weight percent of the total dispersion % solids. Suggested uses include high gloss clear topcoats for wood, concrete, metal and plastics. Yoon center for advanced functional polymers, korea advanced institute of science and technology, 373. An aqueous solvent free aliphatic polyurethane designed for high hardness and clarity with very low voc and good flexibility. A series of aqueous polyurethane dispersions containing carboxylate anion as hydrophilic pendant groups were synthesized through step.
Nonaqueous dispersions of particles and their applications. Waterborne polyurethane dispersions puds are coatings and adhesives that use water as the primary solvent. Synthesis and characterization of anionic polyester polyurethane dispersion as environmentallyfriendly water based resins najafi f. The polyurethane dispersion can be used as a singlecomponent, heatcured system, or part of a twocomponent curable system. Feb 04, 2020 press release waterbased polyurethane dispersions market 2020 industry analysis by future demand, top players, size, share, opportunities, revenue and growth rate through 2024 research reports. Aqueous polyurethane dispersions are prepared by reacting a dihydroxy compounds having a molecular weight of from 500 to 5,000, b diisocyanates and, if required, c chain extenders having at least two hydrogen atoms which are reactive toward isocyanate groups and a molecular weight of less than 300 in the melt or in the presence of a watermiscible, inert organic solvent s which boils. This reacts with the carboxylic acid forming a salt which is water soluble. Waterbased polyurethane dispersions puds are a rapidly growing segment of the polyurethane coating industry due to environmental legislations such as the clean air act and also due to technological advances, that has made them an effective substitute for the solventbased analogs. Ep0746579b1 aqueous anionic polyurethane dispersions. Wo20147701a1 aqueous cationic polyurethane dispersions. At hauthaway, we specialize in the development and testing of custom polyurethane dispersions.
Water based polyurethane dispersion pud is a colloidal system of two components formed by dispersing thermoplastic polyurethane particles, incorporated with internal emulsifying groups in polymer chains, in aqueous medium. Aqueous polyurethane pu dispersion is a binary colloidal system in which pu particles are dispersed in a continuous aqueous media mohaghegh et al. Synthesis and characterization of anionic polyester. Ionicliquidbased polyurethane dispersions for stabilizing. A guide to formulating polyurethane dispersions for use in. Polyester polyols for waterborne polyurethanes and hybrid. Aqueous polyurethane dispersions derived from polycarbonatediols, isophorone diisocyanate, and carboxylic diols including dimethylol propionic acid and dimethylol butyric acid were prepared. Rheological behavior of waterborne polyurethane dispersions was investigated with smallamplitude oscillatory shear flow experiments over wide ranges of concentration, degree of neutralization, chain extension, and temperatures to accelerate efforts to understand their film formation characteristics. Highsolids systems and aqueous polyurethane dispersions ameliorate this problem, but do not go far enough.
Usually diamine chain extender is then added to produce a polyurethane dispersed in water with no free nco groups. The polyurethane prepolymer is the reaction product of a polyol component and a diisocyanate. Alberdingk boley waterbased polyurethane dispersions dur 95 ohfunctional pu dispersion, very hard, high scratch resistance and very high chemical resistance, good adhesion on difficult substrates, fast curing. Us5270383a preparation of aqueous polyurethane dispersions. Aqueous anionic polyurethane dispersions from castor oil. An ionicnonionic polyurethane dispersion with high solid content and low viscosity with a complex hydrophilic chainextending agent was prepared using isophorone diisocyanate as a hard segment and propylene oxide glycol as a soft segment. The effect of dispersing procedure is investigated by ft ir, gpc, and the tensile film properties. Abstract aqueous dispersions of polyurethane pu ionomers were prepared from hydrogenated diphenylmethane diisocyanate. Aqueous polyurethane dispersions basf aktiengesellschaft. Polyurethane water based coatings water borne coatings. Us5608000a aqueous polyurethane dispersion adhesive.
Synthesis and properties of highfunctionality hydroxyl. Because of the use of little or no organic solvent in aqueous pu dispersions, they are nontoxic and non. A series of aqueous polyurethane dispersions containing carboxylate anion as hydrophilic pendant groups were synthesized through step growth polymerization reaction using. Aqueous polyurethanepolyurea dispersions 9102781 peacock. Waterbased polyurethane dispersions market 2020 industry. Iranian polymer journal 14 2, 2005, 163167 preparation and properties of aqueous polyurethane dispersions s. An aqueous polyurethane dispersion is a binary colloidal system in which pu particles are dispersed in a continuous aqueous media 2. Effects of dmpa and bisphenol a polyol on dispersion and physical properties of emulsion cast films young min lee department of polymer science and engineering, pusan national university, pusan 609.
Polyurethane dispersions pud the trend towards waterbased systems is also noticeable in the field of polyurethane adhesives. Synthesis, characterization and properties of waterborne polyurethanes based on two different ionic centers. All aqueous dispersions are stabilized in water to maintain low viscosity during shipping, formulating and application, yet coalesce rapidly into a continuous film upon water evaporation. Msds are provided to help customers satisfy their own handling, safety and disposal needs, and those that. Regarding the methods of preparation, four major processes are described and compared. With increasing federal regulation on the amount of volatile organic compounds vocs and hazardous air pollutants haps that can be emitted into the atmosphere, puds are being used in many industrial and commercial applications.
Preparation and properties of aqueous polyurethane dispersions. Nov 25, 2019 the aqueous polyurethane resin application on the market today are basically pu aqueous dispersions and pu aqueous emulsion, the market is often known as the two types of waterbased pu resin. Apud and aqueous polyurethaneacrylic dispersions apuad technology was recently published. Water based polyurethanes dispersionspudsan overview. The water resistance of the polyurethane films were studied and discussed. We demonstrate that these hoc 11 c 1 imbrbased puds stabilize aqueous graphene dispersions at 1% by weight graphene in ultrasonicated topdown liquid phase exfoliation. The solid contents of dispersions were adjusted to 30% by weight. Aqueous polyurethane apu dispersions having a solid content of 50% were synthesized using dimethyol propionic acid dmpa as the stabilizing moiety. This is accomplished only by balancing the dispersive stability of the syntegra polyurethane dispersion with its tendency to form a film. Polyurethane dispersion, or pud, is understood to be a polyurethane polymer resin dispersed in water, rather than a solvent. An obvious solution to the deficiencies of 2k solventborne polyurethanes and aqueous polyurethane dispersions is a reactive 2k polyurethane system with water as the carrier. Aqueous polyurethane dispersion is a binary colloidal system having dispersed in water polyurethane particles. U 042 excellent hydrolysis resistance, excellent flexibility, outstanding colorfastness, high heat stability, excellent. To investigate the influence of endcappers types on the properties of ohpuds and 2kwpu films, alcoholamines with different hydroxyl functionality were added after the polymer dispersion and before the eda chainextension, and the results.
Its manufacture involves the synthesis of polyurethanes having carboxylic acid functionality or nonionic hydrophiles like peg incorporated into, or pendant from, the polymer backbone. Bip manufacture a range of aqueous polyurethane dispersions for use in a wide variety of applications. Dow waterbased polyurethane dispersions consist of a polyurethane laminating adhesive and water or a watersolvent mixture. Their formation quantitatively follows an analytical model of exfoliation kinetics of layered materials and a stretched exponential kinetic model. Polyurethane dispersions pud selection this guide will endeavor to direct the formulator through the process of selecting polyurethane dispersions for a specific adhesive formulation and enduse requirement. Because of the high cost of these dispersions they are being employed where the performance achieved with waterborne acrylic, alkyd, polyester and epoxy resins is not. Developments in aqueous polyurethane and polyurethaneacrylic.
885 816 1078 227 231 1289 884 502 174 475 1161 1284 473 426 896 1504 1274 1180 1317 171 1459 515 854 808 1218 1125 1126 498 463 357 533