Nekukurumidza kusimukira kweindasitiri yemapepa, kunyanya mapepa akavharidzirwa akagadzirwa nekukurumidza, indasitiri yekudhinda pamapepa akavharidzirwa emhando yezvinodiwa ari kuramba achikwira. Kuti uve nechokwadi chekudhinda kunaka, pamusoro pepepa rakaputirwa rinofanira kuve nekugona kupikisa kukwesha kwemvura. Wet friction resistance (wet friction resistance) zvinoreva mwero wekukuvadzwa pamusoro pebepa mushure mekunge imwe nzvimbo yebepa nekadhibhodhi yaiswa kudhonzwa nekunyorova pasi peimwe pressure, iyo inoratidza kugona kwepamusoro pebepa kuti risaparadzwe nekukwesha kwemvura.
Uye kune iyo isina mvura yakavharwa bepa rine zvakakosha zvinodiwa, kuti iite kuti iwane kugona kwepamusoro kusapinda mvura uye kuramba mvura, mukugadzira bepa maitiro, mukuwedzera kune iyo saizi process mune saizi ajenti uye pamusoro saizi mumiriri, kukurumidza mhedzisiro ndeyekuwedzera mvura inodzivirira mugadziriro yekugadzira, kuitira kuti iyo yekuputira layer iwane yakanaka yekudzivirira mvura.
Panguva imwecheteyo, zvichibva pakufunga nezvekuchengetedza uye kuchengetedzwa kwezvakatipoteredza, zvinodiwa zvemhando yenyika papepa rekuputira chikafu uye bepa remumba zviri kuramba zvichinyanya kuomarara, uye iko zvino zvakanyanya kushandiswa kwe polyamide polyurea formaldehyde resin (PAPU) inodzinga mvura. PAPU inoshandiswa zvakanyanya, nekuti haina yemahara formaldehyde, uye inokurumidza, inoshanda kana yabva pamushini, uye inogona zvakare kuvandudza zvinobudirira kuchinjika kwepepa rakavharwa mukudhinda.
PAPU ine yakasimba application kune pH kukosha, uye viscosity yePAPU yakawedzerwa papende yakagadzikana uye kukurumidza kurapa kunokurumidza. PAPU molecular cheni ine chloroethanol boka uye polyamine boka maviri anoshanda anoshanda mapoka, ayo chloroethanol boka uye pendi adhesive inoburitsa makemikari bonding bond, polyamine boka uye pendi adhesive musanganiswa kuumba ionic chisungo, muchinjika-yakabatana kurapa kuumba network yekurapa firimu, inova ndiyo huru yePAPU mvura inopokana, asiwo seyakavharira mvura inodzivirira.
Mukushandiswa chaiko, PAPU haingogone kuumba zvisungo zvemakemikari zvine starch yakavharwa, asi zvakare inogadzira zvisungo zveionic ne styrene butadiene latex, uye kunyorova kwekupokana kwejasi kunowedzera. Uye zvakare, iyo isina kusimba cationic zvimiro zvePAPU mvura inodzivirira agent inogona zvakare kuburitsa micro-flocculation ine anions mujasi, inovandudza puffiness, porosity uye permeability yeiyo coating layer, uye kugadzirisa kudhinda mashandiro epepa rakapedzwa.
Rheological pfuma chiratidzo chakakosha chependi, PAPU mhando yemvura inodzivirira inogona kuwedzera viscosity yepende, ichiwedzera PAPU mhando yemvura inodzivirira mumiriri mushure mekurasikirwa kwemvura kukosha kwependi, kuchengetedza mvura kuri nani. PAPU mhando inodzivirira mvura mumiririri inokodzera kugadzirira kwependi yeviscosity yakakwira, uye kuchengetedza kwemvura kuita kwepende kuri nani.
Nguva yekutumira: Jul-25-2024