摘要:
Methods of printing a three-dimensional object using co-reactive components are disclosed. Thermosetting compositions for three-dimensional printing are also disclosed.
摘要:
A polyether having a functional group that is reactive to isocyanate with at least one polyisocyanate, which has an average isocyanate functionality in the range of 2.4 to 3.5, and at least one vinyl compound, which has a functional group that is reactive to isocyanate, wherein the molar ratio of polyether to vinyl compound lies in the range of 3:1 to 1:3 and the ratio of the sum of the molar quantities of polyether and vinyl compounds to isocyanate groups lies in the range of 1.5:1 to U.5. Corresponding vinylterminated prepolymers have the advantage of low visocity together with good water solubility and therefore can be used advantageously for applications as injection agents.
摘要:
Multi-piece golf balls containing a dual-core structure are provided. The core structure includes an inner core (center) comprising a foam composition, preferably foamed polyurethane. The outer core layer is preferably formed from a non-foamed thermoplastic composition such as ethylene acid copolymer ionomer. Preferably, the specific gravity (density) of the foam inner core is less than the density of the outer core layer. The ball further includes a cover of at least one layer and may include at least one casing layer. The core structure and resulting ball have relatively good resiliency.
摘要:
A one-part moisture-curable polyurethane composition of the present technology comprises: a preliminary composition containing a urethane prepolymer (A); and an adhesion promoter (B); the adhesion promoter being a reaction product of a compound (b1) having three or more isocyanate groups; and a compound (b2) of at least one type of a compound selected from the group consisting of compounds represented by Formula (1) to (4) described below and hydrogenated compounds of compounds represented by Formula (1) to (3) described below; wherein a ratio (NCO/OH) between an isocyanate group (NCO) of the compound (b1) and a hydroxy group (OH) of the compound (b2) is 1.2 to 3.2; and a content of the adhesion promoter (B) being 0.1 to 10 parts by mass per 100 parts by mass of the preliminary composition.
摘要:
Provided is a method for producing a one-component moisture-curing polyurethane composition, the method comprising: a mixing step in which a liquid component (A) containing a polyol compound is mixed with a powder component (B) containing a filler so as to obtain a paste-like mixture of the liquid component (A) and the powder component (B); a dehydration step in which, following the mixing step, at least a portion of the residual moisture in the paste-like mixture is removed; a prepolymer generation step in which a polyisocyanate compound (C) is mixed with the paste-like mixture following the dehydration step so as to obtain a mixture containing a urethane prepolymer generated by a reaction between the polyisocyanate compound (C) and the polyol compound in the paste-like mixture; and a composition generation step in which the mixture is mixed with an aliphatic isocyanate compound (D) so as to obtain a one-component moisture-curing polyurethane composition.
摘要:
A thermosetting composition containing a compound an oligomer thereof, or both, wherein each R is independently selected from aliphatic alkyl groups having, on average, five or more carbon atoms, which are solid when the alkyl groups have, on average, less than six carbon atoms, has reduced aquatic toxicity. Overspray from spray application of the thermosetting composition can be safely discharged, directly or indirectly, to a sewer.
摘要:
The invention relates to a component system for a two-component coating composition comprising a hydroxy-functional binder or a mixture of hydroxy-functional binders, tris(alkoxycarbonylamino)triazine or a mixture of tris(alkoxycarbonylamino)triazines and free isocyanates or a mixture of free polyisocyanates. It is characterized in that a first component (I) is formed at least from the hydroxy-functional binder or the mixture of hydroxy-functional binders and in that a second component (II) is formed at least from the free isocyanates or the mixture of free polyisocyanates, where the tris(alkoxycarbonylamino)triazine or the mixture of tris(alkoxycarbonylamino)triazines is alternatively a constituent of the first component (I), the second component (II) or both components (I) and (II).
摘要:
The present disclosure relates to a two-component, solvent-based coating composition comprising i) a base component comprising one or more polyesterdiols with a hydroxyl value in the range of from 150 to 500 mg KOH/g and one or more organosilane-modified inorganic fillers, and ii) a polyisocyanate curing component. Said composition can be formulated such that it has a viscosity suitable for spray application (low viscosity under high shear rate) and yield coatings with very good erosion resistance. The present disclosure further relates to a method for coating a substrate using said two-component coating composition, to a coated substrate obtainable by such method, and to use of such coating composition for improving erosion resistance of a substrate.
摘要:
Methods of printing a three-dimensional object using co-reactive components are disclosed. Thermosetting compositions for three-dimensional printing are also disclosed.
摘要:
Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties. Various properties of such networks of polyurethane particles (e.g., strength, stiffness, flexibility, thermal conductivity) may be tailored depending on which monomers are provided in the reaction.