Methods to improve the performance of polyurethane resin - polyurethane, resin, leather - the plastics industry

HC WIRE: Water-based polyurethane has a lot of advantages

, it is widely used in: paint, ink, adhesives, leather finishing agents, leather, gloves Lubricants And so on. Leather finishing agent as an example: the manufacturing process of leather finishing is an important part. It can increase the beauty and durability properties of leather, improve grades, increase the variety, to expand usage. Which polyurethane coating finish film performance, high opacity, strong bond, excellent physical properties of the coating can greatly improve the level of leather, this was a focus of widespread concern. Present, most water-based PU is mainly prepared from the emulsion to contain hydrophilic groups of the PU main curing ingredients, dry film can not be effective if the hydrophilic component into the crosslinked network, the drying of the coating formed membrane swelling with water easily. Also like its lack of two-component PU coating solvent can be cross-linking density and high molecular weight, and thus the dispersion coating of water resistance, solvent resistance, heat resistance and gloss of less serious limits the scope of its use. Therefore, often used to improve the crosslinking density of the coating to improve the water resistance of the coating emulsion. Commonly used cross-linking two ways: one is the synthesis of PU prepolymer, adding functionality greater than 2, polyols, direct health-linked PU prepolymer, the prepolymer will be well dispersed water, and the formation of extended chain molecules, and finally the formation of emulsion. This method is also called the former cross-linking method, defects are easy to make the prepolymer viscosity increases, more difficult to disperse in the water, affecting the stability of emulsion. In recent years new Crosslinker And polyfunctional chain extender of the filter and the synthesis of very active, has become a water-based PU to improve mechanical properties and water resistance is one major way. Another way to cross-linking methods, using the anion with a carboxyl PU emulsion cross-linking, cross-linking reaction of the carboxyl group in the PU molecules, there aziridine, imine carbon and metal salts, carried out at room temperature crosslinking. This type of Crosslinker Normally when using the PU emulsion added, because of its fast rate of crosslinking reaction, gelation and emulsion breaking short period of time. Cross-linking method can be successfully resolved hydrophilic PU emulsion coating problems, but additional cross-linking agent to form a two-component coating agent to the construction inconvenience, this method uses less. We will now a series of modified silicone resin introduced into the PU leather, polyurethane coating, polyurethane adhesives, shoe sole materials, polyurethane coatings, printing ink and going through the comparison of test engineers find and solve the current water-based PU PU products oily problems exist. A copy of the products described below: 1, adhesive: The series for the modified silicone cross-linking agent, can enhance the synthetic leather with PU coating different substrate materials, the adhesion between, so a corresponding increase in coating resistance, and adhesion, and bring water solution and Smooth feel. Can replace more toxic aziridine crosslinker. 2, wetting agent: This series is designed to improve between the polyurethane and polyurethane coating materials, coating materials and different wettability between the substrate and also can be used as synthetic leather, polyurethane foam regulating agents and leveling agents. 3, uniform pore: The series products are mainly used to improve the coating into the muscle, thereby improving the final touch of leather and surface mobility. This series does not contain hydroxyl groups can serve as an effective wetting agent and uniform pore. 4, leveling agent: The family can give polyurethane synthetic leather surface smoothness. Wet process to improve the surface water vapor permeability bass, leveling; dry process, the increase in the anti-sticking of PU leather, and a silky feel. 5, Cell Regulators: This series is designed for wet slurry into the leather of polyurethane foam in the process of control of cell structure and bundle vertical slab to the uniform circular type.

Methods to improve the performance of polyurethane resin - polyurethane, resin, leather - the plastics industry

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