Definisie van kleefmiddel

Kleefkennis Natuurlike of sintetiese, organiese of anorganiese stowwe wat twee of meer dele of materiale met mekaar kan verbind deur die effekte van koppelvlakhechting en samehang van stowwe, gesamentlik kleefmiddels genoem.

① 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

Moet in staat wees om die vloeistof op een of ander manier in 'n vaste of geliese toestand te transformeer om 'n taai en stabiele lymlaag te vorm

After Dit moet 'n sekere sterkte hê na u genesing. In staat om betroubaar te verbind, spanning oor te dra en skade te weerstaan

⑤ Kan 'n temperatuur van meer as 0 ° C weerstaan ​​en 'n sekere tydperk weerstaan

Klassifikasie van gom

Geklassifiseer volgens voorkoms: oplosmiddelgebaseerde emulsiesoort (waterig); plak of plak; soliede tipe; film tipe.

Volgens die uithardingsmetode: verdampingstipe op waterbasis, tipe verdampingsmiddel, smelttipe, chemiese reaksietipe, drukgevoelige tipe.

Basiese samestelling van kleefmiddel

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.

Tipe basismateriaal: Die basismateriaal is die hoofkomponent van die kleefmiddel, die hoofmiddel of die belangrikste polimeer, en speel 'n kleefrol. Volgens die chemiese samestelling is die bronne van die basiese materiaal anorganiese verbindings en organiese verbindings. Organiese verbindings is polimeerbande vir polimeersintese.

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

Uithardingsmiddel (verhardingsmiddel): Die grondstof in die grondtoestand ondergaan chemiese reaksies om polimerisasie, polikondensasie of verknopingsreaksies te ondergaan om in lineêre polimere of netwerkpolimere te verander. Dit is 'n stof wat meganiese sterkte en stabiliteit het.

Die rol van oplosmiddels:

① Polimerisasiereaksiemedium: matige reaksie en maklike temperatuurbeheer

② Oplos van basismateriaal: voorbereiding van oplosmiddelgebaseerde kleefkennis

Verdunner: Verdun die kleefmiddel tot 'n sekere viskositeit, wat goed is om te benat en te bedek.

④ Pas die verdampingsnelheid van die kleefmiddel aan

⑤ Voorkom gel, gebruik om die bergingstabiliteit te verhoog

⑥ Oppervlakkige skoonmaakmiddel voor heg

⑦ Direkte binding, sommige plastiek

⑧ Verminder koste en verhoog voordele