Coating classification: balance of elasticity, rigidity and stain resistance of coating

Core hints: polymers have three states: glassy state, elastic state and viscous flow state There are two transition points corresponding to temperature Tg is the glass transition temperature of polymer, and the polymer is transformed from glass to elastic state Tf is that polymer is transformed from elastic state to viscous flow dynamic temperature, and elastic emulsion requires Tg~Tf to have a wide temperature range The elastic coating film can extend and shrink with the change of stress, and has proper modulus and tensile strength when it is stretched The elasticity of the coating of elastic coating is determined by the composition and structure of the elastic emulsion polymer, and the polymer is in glass state below its glass transition temperature Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Coatings home news: polymers have three states: glass state, elastic state, viscous flow state, corresponding to two transition point temperatures, Tg is the polymer glass transition temperature, is polymer from glass state to elastic state temperature, Tf is polymer from elastic state to viscous flow dynamic temperature, elastic emulsion requirements Tg~Tf has a wide temperature range The elastic coating film can extend and shrink with the change of stress, and has proper modulus and tensile strength when it is stretched The elasticity of the coating of elastic coating is determined by the composition and structure of the elastic emulsion polymer When the polymer is below the glass transition temperature, it is in glass state and becomes hard solid without elasticity Generally, the coating film is in this glassy state within the use temperature range When the polymer is in the rubbery state above its glass transition temperature and below TF, the mechanical property presented is high elasticity Elastic latex paint is made based on this mechanical property of polymers The molecules of this kind of polymers are highly crimped, and the force between molecules is weak, which is easy to deform under the action of external force After removing the external force, the deformation disappears and has high elasticity The key to the composition of the elastic coating is the elastic emulsion, which is different from the ordinary emulsion Its glass transition temperature is low (below 0 degrees Celsius), lower than the ambient temperature used, and the elastomer is used at the ambient temperature Because of the elasticity of the elastic coating film, the ambient temperature of the coating is within the range of Tg~Tf, it is soft and easy to stain, and the elasticity is a pair of contradictions with the film strength Therefore, the adhesion, tensile strength, stain resistance and waterproof and breathability of the elastic coating are adjusted when designing the elastic coating It is usually balanced through the choice of emulsion and the reasonable PVC adjustment The elastic source of elastic emulsion is related to the internal and external plasticizers The vitrification temperature of the elastic emulsion is at 0-40 C, and the use of different plasticizers is different from the durability of the coating elasticity and the anti fouling ability of the coating The following table shows the advantages and disadvantages of elastic polymer coatings with different structures The advantages and disadvantages of plasticizing method external plasticizer elastic film has excellent extensibility, easy to contaminate, plasticizer external migration, easy to be eroded by mold, only in a narrow temperature range, in a short time, there is extensibility block copolymerization elastic film has good extensibility, plasticizer does not migrate, and the extension time is long, easy to resist pollution internal soft external hard core shell polymerization elastic film Good extensibility, plasticizer without migration, long lasting time, good resistance to contamination, poor adhesion, soft outer hard half moon core shell structure, elastic film, plasticizer do not migrate, extend for a long time, good resistance to dirt, good adhesion, polymerization control is difficult Besides the elasticity of the emulsion itself, the PVC content of the coating formula is also an important factor In a certain range of PVC (PVC < CPVC), the higher the PVC is, the higher the film strength is, the lower the elasticity is, the higher the pollution resistance is, and the higher the film permeability is; otherwise, the lower the PVC is, the better the film elasticity is, the lower the strength is, and the better the film sealing property is In order to achieve the balance of elasticity, strength, stain resistance and water vapor permeability, the formula of the elastic emulsion paint is suitable for PVCC of 20% - 35% Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,