Rheological diagram yekuongorora viscosity yePUR inopisa inonyunguduka inonamatira

1.Rheological Dudziro

Rheological kuyedzwa ndeyekutevedzera maitiro ese emvura yakanyungudutswa colloid kubva pakupotera kusvika pakutonhodza.

Kana iyo elastic modulus yakadzikira kupfuura 1000 Pa, imvura inopisa uye yakanyungudika. Panguva ino, inogona kunyorova iyo yekubatanidza substrate asi haina simba. Mushure mekunge glue yaiswa, iyo colloid inotanga kutonhora uye modulus inotanga kuwedzera, asi muhuwandu hwe1,000-50,000 Pa, iyo colloid ichiri kunyanya mvura, saka inogona kunyorova uye kubatana asi simba rakaderera kugadzirisa substrate. Simba rekutanga harisati ravepo.

Iyo colloid inoramba ichitonhora. Kana iyo modulus inosvika payakakomba huwandu hwe50,000-500,000 Pa, iyo colloid inonyanya kusimba uye semi-mvura. Panguva ino, ine zvese kumwe kunyorova uye kubatanidza kugona uye kumwe kugona kugadzirisa iyo substrate. Kugona, simba rekutanga rinoumbwa. Dunhu rine elastic modulus ye50,000-500,000 Pa inodaidzwa kunzi Dahlquist criterion. Iyo colloid munharaunda iyi inogona kunyorova uye kusungira uye kugadzirisa iyo substrate. pressure senitivity.

Mushure mokunge colloid ichiwedzera kutonhora, modulus yakakura kudarika 500,000 Pa. Panguva ino, inonyanya kusimba, uye haigoni kunyorova uye kusungirirwa zvakare asi ine simba rakanaka. Iyo yekupedzisira modulus yegel yakanyatsotonhorera uye yakaomeswa kazhinji inosvika 1E + 7 kusvika 1E + 8 Pa.

2.Viscosity analysis

Pane kazhinji zvikonzero zviviri zvehurombo viscosity yePUR inopisa melt adhesives: kunamatira kwenhema kana kushomeka kwekutanga simba.

Chikonzero chekunamatira kwenhema ndechokuti nguva yekugara yeglue muDashi pressure-sensitive tape yakanyanyisa, uye kunyorova uye kusungirirwa kwe substrate hakuna kukwana. Iyo PUR inopisa inonyunguduka inonamatira yakavakirwa pacrystalline polyester iri nyore kuumba manyepo adhesion kune dense substrates kana ichishandiswa kusungirira, senge glue mumufananidzo.

Chikonzero chekushaya simba kwekutanga ndechekuti modulus inokwira zvishoma nezvishoma uye yotadza kupinda muDarby pressure sensitive bhendi kana chibatiso chabviswa. Kana iyo PUR inopisa inonyunguduka inonamatira yakavakirwa papolyether kana yemvura polyester ichishandiswa kushungurudza bonding kana kusanganisa, iyo yekutanga simba haina kuumbwa kana iyo gadziriso yabviswa, uye zviri nyore kubuda nekubvisa, sezvakaratidzwa mune b glue mune mufananidzo.

3.perfect curve

Iyo yakakwana rheological curve inofanira kunge iri c mumufananidzo. Haisi chete ine simba rekutanga kana ichinge yabviswa kubva pachibatiso, asi zvakare inogara muDarby pressure-sensitive tepi yakareba zvakakwana kuti inyorovese chisungo kune substrate. Muchidimbu, ine zvese zvakavhurika nguva refu uye yakakwirira yekutanga simba.

Iyo yakajairwa yekugadzira zano ndeyekusanganisa polyether, yemvura polyester uye crystalline polyester, kuwedzera thermoplastic polymers senge acrylic acid uye TPU, uye kuwedzera tackifying resin kana doro ester. Nekudaro, zvakaoma kuwana curve yakakwana zvinoenderana neyakajairwa fomula, uye polyester kana prepolymer ine yakakosha chimiro, senge fumaric acid-based polyester, inodiwa.

Isu tinoturikira dhayagiramu yakadzama yePurkingkuyerera. Isu tine inopisa inonyungudutsa adhesive tsvakiridzo uye kusimudzira uye mhando yekuongorora timu. Isu tinoziva zvakawanda nezve inopisa melt adhesives uye tinokupindura iwe.Bata nesu izvozvikuti tidzidze nezveduinopisa nyunguduka adhesive nyaya, dzidza nezve inopisa inonyungudutsa adhesive application, uye gadzirisa akanakisa, akakodzera, uye aunofarira anonamira iwe!