Cosolvent free waterbased aliphatic polyurethane dispersions offer excellent physical properties with very low VOC. NMP free waterbased aliphatic polyurethane dispersions are translucent single component dispersions that do not contain NMP. Waterbased aliphatic polyurethane dispersions provide superior properties ranging from flexible to hard offering the formulator a wide range of options for coatings and adhesives.
Chase Polymers are water-based polyurethane dispersions that are environmentally responsible and highly durable. Please feel free to request additional information. Polyurethane Dispersions. Solvent-Free Waterborne Polyurethane Dispersions Cosolvent free waterbased aliphatic polyurethane dispersions offer excellent physical properties with very low VOC.
Learn More. Waterborne Polyurethane Dispersions Waterbased aliphatic polyurethane dispersions provide superior properties ranging from flexible to hard offering the formulator a wide range of options for coatings and adhesives.
Flooring Industry. Industrial Paints. Resilient Floors. Contact Us.Aqueous polyurethane dispersion based on a special polyether for high-quality coatings, such as wood, building, parquet floor lacquers; to be combined with hard PU dispersions and self-crosslinking acrylate dispersions.
Aqueous polyurethane dispersion based on a special polyether for high-quality, water-vapour-permeable coatings, such as wood, building, parquet floor lacquers. Aqueous polyurethane dispersion based on a special polycarbonate for high-quality coatings, such as wood, building, parquet floor lacquers. Formaldehyde-free crosslinking component for aqueous polymeric dispersions, eg polyurethane, polyacrylate or polyvinyl acetate dispersion; booster for non-ionic and anionic fluorocarbon impregnating agents.
We are happy to assist you in implementing the process on your articles. Polyurethane Dispersions for aqueous systems. RUCOPUD B-WE Polyurethane dispersion Aqueous polyurethane dispersion based on a special polyether for high-quality coatings, such as wood, building, parquet floor lacquers; to be combined with hard PU dispersions and self-crosslinking acrylate dispersions. Learn more.We provide polyurethane raw materials for the formulation of waterborne and solvent-based heat-activated adhesives.
Thermoplastic polyurethanes and exceptional adhesive raw materials for flexible, durable sport and leisure footwear. Our waterborne adhesive systems offer a more environmentally conscious approach to laminating and bonding.
We provide high-quality raw materials for the cast polyurethane elastomers and adhesives needed to create flexible packaging.
Polyurethane and polychloroprene dispersions for waterborne adhesives used in wet-in-wet bonding applications. Products Products Materials Industries Certificates. It is an adhesives raw material for the formulation of adhesives for use in e. Show all.Crosh commands ipconfig
Dispercoll U Onepager. Raw Materials for High Performance Adhesives. Thermo-activated adhesives We provide polyurethane raw materials for the formulation of waterborne and solvent-based heat-activated adhesives. Waterborne Our waterborne adhesive systems offer a more environmentally conscious approach to laminating and bonding. Packaging We provide high-quality raw materials for the cast polyurethane elastomers and adhesives needed to create flexible packaging. Wet bonding Polyurethane and polychloroprene dispersions for waterborne adhesives used in wet-in-wet bonding applications.
Load More. Related topics Brand. Get in touch with our experts! Enter your message here. How can we contact you? First Name. Last Name. More detailed information and instructions on how you can revoke your consent at any time are provided in our Data Privacy Declaration.With this balance of properties, PUDs are key components of coatings for wood, metal, concrete, and plastic. PUDs are also excellent for blending with acrylic and styrene butadiene latex to cost-effectively create higher performance coatings.
SNP works as a team with the customer to determine the best product within the series to meet the desired properties and application needs. Learn more about our aqueous polyurethanes below. Please contact us for more information.
The reaction forms urethane linkages as seen below. Polyurethane Polymers Urethane Linkage There are two classes of polyurethane dispersions: aromatic and aliphatic. Since the film color stability of aromatic dispersions is suspect, SNP polyurethanes are all aliphatic. The functionality of the actual polymer is dependent upon the polyol and isocyanate used.La frazione di casalsottano nel comune di san mauro cilento (sa
By varying these, the characteristics of the resulting polyurethane can be changed. Three polyols are typically used in synthesizing SNP polyurethane dispersions for industrial coatings applications: polyether, polyester, and polycarbonate. With regard to the properties of durability and toughness, these are in ascending order of performance. The use of co-solvent is typical in PUDs. N-methylpyrrolidone NMP is a traditional co-solvent; but one that has fallen out of favor with many users.
Co-solvent free products offer the customer the option to compound without co-solvent or to use the co-solvent of their choice. However, if one is needed to meet specific end use properties, SNP has expertise in the proper crosslinking systems to be used with its products.
Water based polyurethanes are unique as they have great flexibility and outstanding hardness, which result in a very tough, durable coating. Unlike many polymeric materials, flexibility is maintained regardless of film hardness. Another thing that distinguishes polyurethanes is that they maintain flexibility across a wide range of temperatures. These materials are often used to replace or supplement the performance of synthetic latex in coatings applications.
Typical synthetic latex has difficulty achieving high tensile strength and good flexibility at the same time. Polyurethane dispersions have been shown to build strength, flexibility, durability, chemical, and water resistance into compounded coatings. This is particularly effective in improving the performance of elastomerics for roofing, caulks, and adhesives. Whether for penetrating or gloss concrete sealers polyurethanes have exceptional hardness, toughness, and chemical resistance.
The addition of fine silica sand, aluminum oxide or other aggregate can create a durable non-slip surface. SNP polyurethanes are well suited for the industrial coating of wood, metal, plastic, and masonry surfaces.
We work closely with customers to provide formulation guidance to create an abrasion resistant, tough, hard yet flexible material with excellent adhesion to multiple surfaces. SNP polyurethanes provide abrasion resistance and chemical resistance.
We can formulate our polyurethanes to have many different properties like gloss or matte finish. SNP water based polyurethanes can be used as components of overprint varnishes, printing primers, and ink binders due to their chemical resistance, adhesion properties, and hardness.
SNP polyurethane-based paper coating chemicals are synonymous with great performance. Our products are being used to improve the performance of a number of different paper types, including:. Key properties: Superior balance of strength and flexibility Low-temperature crack resistance Abrasion and chemical resistance Excellent adhesion to a wide variety of surfaces Compatibility with synthetic latexes Many products low VOC or co-solvent free 1K products give a combination of excellent performance and ease of use With this balance of properties, PUDs are key components of coatings for wood, metal, concrete, and plastic.This application is a division of application Ser.
This invention relates to a new water-based adhesive formulation. Specifically, a formulation having enhanced characteristics such as excellent adhesion without heat activation. More specifically, it relates to a one-component aqueous sulfonated polyurethane adhesive formulation having enhanced properties for use in applications where use of heat for activation is undesirable or unavailable.
Aqueous polyurethane dispersions have received a great deal of attention recently. These dispersions are compatible with many other water-based polymers, and adhesives made from them usually exhibit improved performance. Examples of these activities can be found in JP and JP These patents disclose heat curing, water-resistant and stable adhesive compositions comprising dispersions of partially saponified polyvinyl acetate, aqueous solutions of polyurethanes and dispersable polyisocyanate compounds.
The adhesive properties of these compositions are generated with a heat curing cycle. JP discloses another adhesive composition prepared by adding polyisocyanate crosslinking agents to a blend of aqueous polyurethane resins and polyvinyl latex. This polyurethane based adhesive composition is reported to exhibit high adhesion, and excellent heat and water resistance.
German Utility Model patent no. This water-based formulation describes a polymer blend of polyurethane dispersions, EVA's or methacrylic derivatives, characterized in that it comprises one essentially non-hydrophobic plasticizer.
A draw back for these prior art compositions is the need for heat activation, making them unsuitable for use where heat for activation is either unavailable or destructive to the substrates or parts being bonded together.
The present inventors have now discovered a one-component sulfonated aqueous polyurethane dispersion based adhesive formulation having excellent adhesive properties, good green strength, solvent resistance, and capable of forming moisture and heat resistant bonds without heat activation. The present invention is directed to a novel adhesive formulation comprising plasticized aqueous polyurethane dispersion blends.
The formulations of the invention provide excellent adhesion properties upon pressurized joining of coated substrates. This adhesion property, without heat activation, and the unexpected heat resistant properties of the resulting bonds on aging, are believed to be unique properties for polyurethane dispersion adhesive formulations. The inventive adhesive formulations have properties superior to polychloroprene e. The preferred formulations of the invention, when used with a crosslinker, have very long pot-lives, in some cases up to a month or more after addition of the crosslinker.
Surprisingly, such formulations even after a month exhibit excellent green strength characteristics without heat activation. This allows formulations containing crosslinking additives to be shipped by the manufacturer as one-component compositions, and provides a substantially improved convenience to the end user.
The applied adhesive films have a useful life or "open time" time between the making of said films and the using of said films to form the bonded structure ranging from about an hour to a few hours, depending on the composition of the dispersion and the crosslinkers chosen. The invention is also directed to the use of the inventive formulations as adhesives and to an adhesively bonded structure comprising said formulation as the adhesive. The invention also relates to a polyurethane dispersion based adhesive formulation containing an interpenetrating network having crosslinked matrixes for improved heat, moisture and solvent resistance, and to the process of manufacture and use of the same.While most polyurethanes are thermosetting polymers that do not melt when heated, thermoplastic polyurethanes are also available.
Polyurethane polymers are traditionally and most commonly formed by reacting a di- or triisocyanate with a polyol. Since polyurethanes contain two types of monomers, which polymerise one after the other, they are classed as alternating copolymers. Both the isocyanates and polyols used to make polyurethanes contain, on average, two or more functional groups per molecule.
Polyurethanes are used in the manufacture of high-resilience foam seating, rigid foam insulation panels, microcellular foam seals and gasketsspray foamdurable elastomeric wheels and tires such as roller coasterescalatorshopping cartelevatorand skateboard wheelsautomotive suspension bushingselectrical potting compounds, high-performance adhesivessurface coatings and sealants, synthetic fibers e.
These materials were also used to produce rigid foams, gum rubber, and elastomers. In DuPont introduced polyether polyols, specifically poly tetramethylene ether glycoland BASF and Dow Chemical started selling polyalkylene glycols in Polyether polyols were cheaper, easier to handle and more water-resistant than polyester polyols, and became more popular. Union Carbide and Mobaya U. The availability of chlorofluoroalkane blowing agents, inexpensive polyether polyols, and methylene diphenyl diisocyanate MDI allowed polyurethane rigid foams to be used as high-performance insulation materials.
Inurethane-modified polyisocyanurate rigid foams were introduced, offering even better thermal stability and flammability resistance. During the s, automotive interior safety components, such as instrument and door panels, were produced by back-filling thermoplastic skins with semi-rigid foam.
Formulating with polyurethane dispersions
Parts of this car, such as the fascia and body panels, were manufactured using a new process called reaction injection molding RIMin which the reactants were mixed and then injected into a mold. The addition of fillers, such as milled glass, micaand processed mineral fibres, gave rise to reinforced RIM RRIMwhich provided improvements in flexural modulus stiffnessreduction in coefficient of thermal expansion and better thermal stability.
This technology was used to make the first plastic-body automobile in the United States, the Pontiac Fieroin Further increases in stiffness were obtained by incorporating pre-placed glass mats into the RIM mold cavity, also known broadly as resin injection moldingor structural RIM. Starting in the early s, water-blown microcellular flexible foams were used to mold gaskets for automotive panels and air-filter seals, replacing PVC polymers.
Polyurethane foams have gained popularity in the automotive realm, and are now used in high-temperature oil-filter applications. In the early s, because of their impact on ozone depletionthe Montreal Protocol restricted the use of many chlorine -containing blowing agents, such as trichlorofluoromethane CFC By the late s, blowing agents such as carbon dioxidepentane1,1,1,2-tetrafluoroethane HFCa and 1,1,1,3,3-pentafluoropropane HFCfa were widely used in North America and the EU, although chlorinated blowing agents remained in use in many developing countries.
Polyurethane products often are simply called "urethanes", but should not be confused with ethyl carbamatewhich is also called urethane. Polyurethanes neither contain nor are produced from ethyl carbamate. Non-isocyanate based polyurethanes NIPUs have been developed to mitigate health and environmental concerns associated with the use of isocyanates to synthesize polyurethanes.
Polyurethanes are in the class of compounds called reaction polymerswhich include epoxiesunsaturated polyestersand phenolics. The properties of a polyurethane are greatly influenced by the types of isocyanates and polyols used to make it. Long, flexible segments, contributed by the polyol, give soft, elastic polymer. High amounts of crosslinking give tough or rigid polymers. Long chains and low crosslinking give a polymer that is very stretchy, short chains with many crosslinks produce a hard polymer while long chains and intermediate crosslinking give a polymer useful for making foam.
The crosslinking present in polyurethanes means that the polymer consists of a three-dimensional network and molecular weight is very high. In some respects a piece of polyurethane can be regarded as one giant molecule.Prova designs
One consequence of this is that typical polyurethanes do not soften or melt when they are heated; they are thermosetting polymers.
The choices available for the isocyanates and polyols, in addition to other additives and processing conditions allow polyurethanes to have the very wide range of properties that make them such widely used polymers.
Isocyanates are very reactive materials. This makes them useful in making polymers but also requires special care in handling and use.
Most of the isocyanates are difunctional, that is they have exactly two isocyanate groups per molecule.Ibrahim Bechara Polyurethane dispersion films are inherently more sensitive to moisture, however, when crosslinked they are an effective substitute for the solvent-based urethanes.
Different crosslinkers, their activation temperatures, typical crosslinking mechanisms and advantages of these resins as grinding vehicles and paint extenders for both organic and inorganic pigments are shown. Also discussed is their formulation with a variety of other water-borne resins and with different crosslinkers to optimize their properties. Examples of different formulations and their properties both clear and pigmented are shown.Synthesis of DNPO
Their versalitity and wide range of superior properties such as abrasion resistance, impact strength, and low temperature flexibility are the driving force to their continuously expanding usage in many applications. Table 1 shows a summary of some industrial applications for these environmentally friendly resins. The development of the PUDs is relatively new. In the early s they were considered exotic chemicals of academic interest. Today, as can be judged from the large number of patents on these resins and from the numerous companies producing them, they are an important industrial commodity.
The market for PUDs in the U. Figure 1 shows a typical particle size distribution for a semi-translucent PUD. They are free of isocyanate residues and have a zero or very low volatile organic content VOC. They are safe to handle and are a good choice for compliant coatings. PUDs can be made to have 30?
Water borne urethanes, although structurally similar to conventional polyurethane, are quite different in physical and film formation properties. Table 2 summarizes the key differences. PUDs are rarely used successfully as is. To obtain good films of optimum properties they need to be formulated skillfully.Auto shop liquidation auction
The formulation of PUDs into a good coating is a complex art that requires understanding of their chemical and physical properties. The intent of this paper is to highlight these properties and show how they can be used advantageously in formulating PUDs for a variety of end-uses. Polyurethane dispersions are no exception. Their polymeric structure is formed by usually reacting an excess of aliphatic isocyanates with a polyol or a mixture of polyols to form a prepolymer containing the so called soft segment.
The polyols are generally polyesters, polyethers, or polycarbonates. The hard segment is generally formed by chain extending the prepolymer with short chain diamines and from the short chains containing ions.Il marketing per crescere. 8 percorsi per vincere
Figure 2 summarizes these reactions. Due to incompatibility between the two segments of the polymer chain, the hard segment separates and aggregates into domains that act as reinforcing filler to the soft segment.
Figure 3 is a pictorial representation of a polyurethane with hard segment domains. The degree of phase separation as well as the concentration of the hard segment are contributing factors to the good properties of the polyurethane dispersions. In addition to the hard and soft segment morphology, the PUDs owe their properties, in part, to the association of the ionic groups which form pseudo cross-links at ambient conditions. In particular, the good low temperature and the excellent film forming properties of the PUDs are directly related to the afore mentioned morphologies.
There are three types of polyurethane dispersions that are commercially important. Figure 4 shows the distinctive feature of each type. An understanding of the structures of these dispersions is essential to formulating them successfully. The anionic PUDs which contain carboxylate or sulfonate ions are the most used commercially and they are generally stable under alkaline conditions of pH higher then 7.
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