Chii chinonzi girazi-shanduko tembiricha (Tg) yezve dispersible polymer hupfu?

Iyo tembiricha yegirazi-shanduko (Tg) yeadhispersible polymer hupfu inogona kusiyana zvichienderana neiyo chaiyo polymer kuumbwa uye magadzirirwo. Redispersible polymer powders anowanzo kugadzirwa kubva akasiyana mapolymers, anosanganisira ethylene-vinyl acetate (EVA), vinyl acetate-ethylene (VAE), polyvinyl doro (PVA), acrylics, uye vamwe. Imwe neimwe polymer ine yayo yakasarudzika Tg, inova tembiricha iyo iyo polymer inoshandura kubva kune ine girazi kana kuomarara mamiriro kuenda kune rubbery kana viscous state.

Iyo Tg ye redispersible polymer poda inokanganiswa nezvinhu zvakaita se:

1. Polymer Kuumbwa: Mapolymer akasiyana ane akasiyana Tg maitiro. Semuyenzaniso, EVA kazhinji ine Tg siyana inosvika -40°C kusvika -20°C, ukuwo VAE inogona kuva neTg siyana inosvika -15°C kusvika 5°C.
2. Additives: Kusanganisirwa kwezvinowedzera, senge plasticizers kana tackifiers, zvinogona kukanganisa iyo Tg ye redispersible polymer poda. Izvi zvinowedzera zvinogona kuderedza Tg uye kuwedzera kushanduka kana kunamatira zvivakwa.
3. Particle Saizi uye Morphology: Iyo particle saizi uye morphology yezve inodispersible polymer poda inogonawo kukanganisa Tg yavo. Finer particles anogona kuratidza akasiyana ekupisa zvimiro zvichienzaniswa neakakura zvidimbu.
4. Kugadzira Maitiro: Iyo yekugadzira maitiro anoshandiswa kugadzira zvakare dispersible polymer poda, kusanganisira nzira dzekuomesa uye mushure-matanho ekurapa, anogona kukanganisa iyo Tg yechigadzirwa chekupedzisira.

Nekuda kwezvinhu izvi, hapana imwechete Tg kukosha kune ese anodispersible polymer hupfu. Panzvimbo iyoyo, vagadziri vanowanzopa zvakatemwa uye tekinoroji data mapepa anosanganisira ruzivo nezve polymer kuumbwa, Tg renji, uye zvimwe zvine chekuita nezvigadzirwa zvavo. Vashandisi vehupfu hwepolymer hunogona kudzokororwa vanofanirwa kubvunza magwaro aya kune chaiwo Tg kukosha uye rumwe ruzivo rwakakosha rwune chekuita nekushandisa kwavo.