Coating knowledge: Analysis on the composition and characteristics of polyurethane powder coating

It is pointed out that polyurethane powder coating, as a kind of powder coating, has many excellent properties, such as high glossiness, excellent decorative performance, strong wear resistance, good adhesion, good weather resistance, corrosion resistance, electrical performance and mechanical performance It can be said that it takes into account the advantages of epoxy and acrylic powder coating, and has more advantages than pure polyester powder coating Non toxic advantages In many applications including industry, agriculture, transportation and aerospace, the powder coating can play its advantages 1、 The composition of polyurethane powder coating Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Home of coatings: polyurethane powder coating, as a kind of powder coating, has many excellent properties, such as high glossiness, excellent decorative performance, strong wear resistance, good adhesion, as well as good weather resistance, corrosion resistance, electrical performance and mechanical properties Performance, it can be said that it takes into account the advantages of epoxy and acrylic powder coating, but also has the advantages of non-toxic than pure polyester powder coating In many applications including industry, agriculture, transportation and aerospace, the powder coating can play its advantages 1、 The composition of polyurethane powder coating polyurethane powder coating is based on hydroxyl polyester resin and blocked isocyanate curing agent, with leveling agent and pigments and fillers mixed, melted, extruded and crushed Isocyanate, which is in a closed state when the coating is baked, is released and used for curing The whole curing reaction is as follows: 2 The composition and characteristics of polyurethane powder coating isocyanate can react with any compound containing active hydrogen, in addition to the formation of carbamate with hydroxyl group, it can also generate amide with carboxyl group, and generate amine, urea, biuret and acyurea with water, amine, urea, carbamate and amine respectively The characteristics of polyurethane powder coating polyurethane powder coating has not only the general characteristics of general powder coating, but also the following characteristics: 1 The melting viscosity of powder coating is low at ordinary melting flow, and the film leveling is good In particular, the sealer does not have chemical reaction before unsealing, so that the paint has enough leveling time, and it is easy to get smooth and smooth coating 2 Good adhesion to the coating, generally no need to apply primer 3 The preparation range of the coating is wider than that of pure polyester powder By changing the resin structure, hydroxyl value and the content of polyurethane resin, the powder coating with different performance requirements and curing speed can be prepared The color matching performance of the powder coating is good 4 The physical and mechanical properties and chemical resistance of the coating film are excellent 5 Aromatic isocyanate cured powder coating has good corrosion resistance and is suitable for indoor use; aliphatic isocyanate cured powder coating has good weather resistance and is suitable for outdoor high decoration use 6 The coating has good workability, mainly by electrostatic powder spraying The biggest drawback of polyurethane powder coating is the release of sealer when the film is solidified in the oven, which causes the pollution of the environment and atmosphere In addition, when the coating is too thick, pinholes or bubbles are easily generated due to the release of the sealer Therefore, we should try to reduce the amount of sealer, reduce the emission to the atmosphere, and consider the use of non-toxic sealer [focus on WeChat official account "paint net"; pay attention to surprises, scan code to see if your husband is selling paint.. "Paint group: 92525666] coatings house is focused on coatings, diatom mud, paint and coatings, coating technology, fire retardant coatings news information and coatings, diatom mud, paint and coating, coating technology, fire retardant coatings decoration knowledge and decoration effect map.