Oxford PU coating agents are classified according to composition: polyester polyurethane; polyether polyurethane; aromatic isocyanate polyurethane; aliphatic isocyanate polyurethane Polyurethane. According to the medium used, it is divided into solvent type and water type.
Solvent-based PU coating glue
Solvent-based PU has good strength and water resistance Sexy, but highly toxic and flammable. In terms of components, it is also divided into two-group classification and single-group classification. The two-component product consists of a prepolymer and a cross-linking agent. The prepolymer is a prepolymer with hydroxyl groups at the end produced by the reaction of isocyanate and oligomeric polyol. Cross-linking agents are compounds containing multiple (three or more) isocyanate groups. Most solvent-based PU coating glues use DMF or a mixture of toluene and isopropyl alcohol as the solvent. In order to achieve waterproof and moisture-permeable effects, solvent-based coating finishing agents generally use wet coating processes to process fabrics.
Water-based PU coating glue
Water-based type is divided into two types: water-soluble and water-dispersible. Water-based PU is used for fabric coating and finishing, with large quantities and wide coverage, and has good waterproof properties. Water-based PU coating glue is usually used for dry coating. In order to improve the water resistance, softness and durability of the coated product, front and rear waterproofing should be carried out.
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