Sab hauv thiab sab nraud phab ntsa wilty hmoov, vuas luaj taw tes, sab nraud cug, cov dej sib xyaw ua kom zoo nkauj, kev sib xyaw ua kom zoo nkauj
Nyob rau hauv cug lub tshuaj khib, nws yog txhawm rau txhim kho qhov brittleness, high elastic mapulus thiab lwm yam tsis muaj zog thiab ncua lub cim cug kab nrib pleb. Txij li cov polymer thiab cov tshuaj khib ua cov qauv kev sib txuas lus hauv lub qhov hws, yog li cov tshuaj khib nyiab polymer tom qab ua kom huv si yog qhov zoo dua li xis tsw qab. Muaj kev txhim kho loj heev.
Lub luag haujlwm ntawm redispersible looj hmoov hauv putty yog feem ntau nyob rau hauv cov nram no:
1. Txhim kho cov nplaum thiab cov kws kho mob ntawm cov zaub mov. Redispersible looj cov hmoov yog cov hmoov nplaum nplaum ua los ntawm cov emulsion tshwj xeeb (siab molecular polymer) tom qab ua kom qhuav. Cov hmoov no tuaj yeem redincers sai rau hauv emulsion tom qab kev hu rau dej, thiab muaj cov khoom qub, nws tuaj yeem tsim ib zaj yeeb yaj kiab tom qab dej evaporates. Zaj duab xis no muaj siab dua, huab cua siab tsis kam thiab kev tawm tsam thiab kev tawm tsam rau ntau yam adhesion siab rau substrates. Tsis tas li ntawd, lub hydrophobic looj hmoov tuaj yeem ua cug tshuaj pleev hluav taws xob.
2. Txhim kho cov cohesion ntawm putty, zoo heev tiv, alkali tsis kam, hnav tsis kam, thiab txhim kho lub zog yooj yim.
3. Txhim kho cov dej tsis muaj dej thiab permeability ntawm putty.
4. Txhim kho cov dej khaws cia kom muaj putty, nce lub sijhawm qhib, thiab txhim kho kev ua haujlwm.
5. Txhim kho qhov cuam tshuam tsis kam ntawm putty thiab txhim kho lub durability ntawm putty.
2. Lub luag haujlwm ntawm redispersible looj cov hmoov av nplaum yog feem ntau hauv cov hauv qab no:
1. Raws li tus nqi ntawm xis mas nce, thawj lub zog ntawm cov vuas nplaum nce. Nyob rau tib lub sijhawm, lub tsho tshaj lub zog tom qab siv zog hauv dej thiab cov tensile nplaum lub zog tom qab kev laus tshav kub kuj nce ntxiv. Tus nqi ntawm cov xis mas yuav tsum tau siab dua 35%.
2. Nrog rau qhov nce ntawm redispersible looj cov dej ua kom muaj zog ntxiv tom qab lub zog tensile nce ntxiv tom qab kev sib tw thermal no tau pom tseeb.
3. Nrog qhov nce ntawm tus nqi ntawm cellulose ether, lub tensile lub zog nce ntxiv, thiab lub zog tensile nce ntxiv, thiab lub zog ua ntej nce ntxiv thiab tom qab ntawd txo qis. Cov nyhuv yog qhov zoo tshaj plaws thaum lub cellulose cov ntsiab lus yog ib puag ncig 0.3%.
Thaum siv recispersible looj hmoov, peb yuav tsum them sai sai rau qhov ntau, kom nws ua si nws lub luag haujlwm.
Lub Sijhawm Post: Jun-05-2023