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conhecimento sobre adesivos é muito difundido, você realmente entende os adesivos?

xinst02 de abril de 2020

Definição de adesivo

Conhecimento adesivo Substâncias naturais ou sintéticas, orgânicas ou inorgânicas que podem conectar duas ou mais partes ou materiais através dos efeitos da interface de adesão e coesão de substâncias, coletivamente referidas como adesivos) Também chamado de adesivo, normalmente chamado de cola.

Adhesion (adhesion): refers to the state where two surfaces are held together by chemical, physical, or both forces

② The adhesive must first adhere to the surface of the adherend. This is due to the adhesion between the two phases, which is derived from the secondary or primary bond force.

Cohesion: That is, the state of each particle in a single substance is combined by primary valence (including ionic, covalent, coordination, metal, etc.) and secondary valence (including van der Waals, hydrogen bonding). The cohesive force of the adhesive is related to factors such as intermolecular force, relative molecular mass, degree of cross-linking, crystallization and molecular entanglement.

 

 

Adhesive requirements Adhesive knowledge

① Regardless of the state, it should be liquid when coating

② The surface of the adherend can be fully spread and fully wetted

③ Deve ser capaz de transformar o líquido em um estado sólido ou gel de alguma forma para formar uma camada de cola resistente e estável

④ Deve ter uma certa resistência após a cura. Capaz de se conectar de forma confiável, transferir estresse e resistir a danos

⑤ Pode suportar temperaturas acima de 0 ° C e resistir a um determinado período de tempo

 

Classificação de adesivos

Classificado por aparência: tipo de emulsão à base de solvente (aquosa); colar ou colar; tipo sólido; tipo de filme.

De acordo com o método de cura: tipo de evaporação à base de água, tipo de evaporação de solvente, tipo de hot-melt, tipo de reação química, tipo sensível à pressão.

 

Composição básica do adesivo

The basic composition of adhesives: the components of adhesives include base materials, curing agents, solvents, plasticizers, fillers, coupling agents, crosslinking agents, accelerators, tougheners, tackifiers, thickeners, diluents, Anti-aging agent, polymerization inhibitor, flame retardant, initiator, photosensitizer, defoamer, preservative, stabilizer, complexing agent, emulsifier.

Type of base material: The base material is the main component of the adhesive, the main agent or the main polymer, and plays an adhesive role. According to the chemical composition, the sources of the base material are inorganic compounds and organic compounds. Organic compounds are polymer binders for polymer synthesis.

① Common organic compounds: thermosetting synthetic resins: phenolic resin, epoxy resin, amino resin, polyurethane resin, unsaturated polyester and acrylic resin

② Thermoplastic synthetic resin: rubber base material, natural polymer material, water-based latex, base material

③ Rubber base adhesive

Selection principle of adhesive base material: According to the application object, application occasion and application performance of the adhesive. At the same time, the molecular structure of the molecular base is closely related to the adhesion properties.

① The polarity of polymer materials is related

② Crystallization of polymer materials

③ Molecular weight of polymer materials

Curing agent (hardening agent): The raw material in the ground state undergoes chemical reactions to undergo polymerization, polycondensation, or cross-linking reactions to change into linear polymers or network polymers. It is a substance that has mechanical strength and stability.

 

The role of solvents:

① Polymerization reaction medium: moderate reaction and easy temperature control

② Dissolving base material: preparing solvent-based adhesive knowledge

③ Thinner: Dilute the adhesive to a certain viscosity, which is good for wetting and coating.

④ Adjust the volatilization rate of the adhesive

⑤ Prevent gel, used to increase storage stability

⑥ Surface cleaning agent before bonding

⑦ Direct bonding, some plastics

⑧ Reduce costs and increase benefits

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