Chidziwitso choyambirira cha ufa wa polima wotayika

1. mfundo zofunika

Redispersible polima ufandicho chowonjezera chachikulu cha ufa wouma wokonzeka kusakaniza matope monga simenti kapena gypsum.

Redispersible latex ufa ndi emulsion ya polima yomwe imawumitsidwa ndikuwunikiridwa kuchokera ku 2um yoyambira kupanga tinthu tating'onoting'ono ta 80 ~ 120um. Chifukwa pamwamba pa tinthu tating'onoting'ono takutidwa ndi inorganic, zolimba zosagwira ufa, timapeza youma polima ufa. Ndiosavuta kutsanulira ndi thumba kuti asungidwe m'malo osungira. Pamene ufawo umasakanizidwa ndi madzi, simenti kapena matope opangidwa ndi gypsum, ukhoza kubalalitsidwanso, ndipo tinthu tating'onoting'ono (2um) mmenemo timapanganso m'malo ofanana ndi latex oyambirira, choncho amatchedwa redispersible latex powder.

Iwo ali wabwino redispersibility, kachiwiri disperses mu emulsion pa kukhudzana ndi madzi, ndipo ali ndendende chimodzimodzi mankhwala katundu monga choyambirira emulsion. Powonjezera ufa wa polima wosakanizika pamatope opangidwa ndi simenti kapena gypsum, zinthu zosiyanasiyana zamatope zitha kusinthidwa, monga:

Kupititsa patsogolo kumamatira ndi mgwirizano wamatope;

Kuchepetsa kuyamwa kwamadzi kwazinthu ndi zotanuka modulus zakuthupi;

Flexural mphamvu, kukana mphamvu, kukana abrasion ndi kulimba kwa zida zolimbikitsira;

Kupititsa patsogolo ntchito yomanga ya zipangizo, etc.

2. Mitundu ya ufa wa polima wotayika

Pakadali pano, ntchito zazikulu pamsika zitha kugawidwa kukhala disperse latex:

Vinyl acetate ndi ethylene copolymer rabara ufa (Vac/E), ethylene ndi vinilu kloride ndi vinilu laurate ternary copolymer rabara ufa (E/Vc/VL), vinilu acetate ndi ethylene ndi apamwamba mafuta asidi vinilu ester terpolymerization Rubber ufa (Vac/E/ VeoVa), vinyl acetate ndi apamwamba mafuta acid vinilu ester copolymer rabara ufa (Vac/VeoVa), acrylate ndi styrene copolymer rabara ufa (A/S), vinilu acetate ndi acrylate ndi apamwamba mafuta asidi Vinyl ester terpolymer rabara ufa (Vac/A/ VeoVa), vinyl acetate homopolymer rabara ufa (PVac), styrene ndi butadiene copolymer rabara ufa (SBR), etc.

3. The zikuchokera dispersible polima ufa

Dispersible polymer powders nthawi zambiri amakhala ufa woyera, koma ochepa amakhala ndi mitundu ina. Zosakaniza zake ndi:

Utomoni wa polima: Umapezeka pakatikati pa tinthu tating'ono ta mphira, ndipo ndiyenso gawo lalikulu la ufa wa polima wopangidwanso.

Zowonjezera (zamkati): pamodzi ndi utomoni, zimagwira ntchito yosintha utomoni.

Zowonjezera (zakunja): Zida zowonjezera zimawonjezedwa kuti zipititse patsogolo magwiridwe antchito a ufa wa polima wotayika.

Kuteteza colloid: wosanjikiza wa zinthu hydrophilic wokutidwa pamwamba redispersible latex ufa particles, zoteteza colloid ambiri redispersible latex ufa ndi polyvinyl mowa.

Anti-caking agent: Fine mineral filler, yomwe imagwiritsidwa ntchito makamaka kuletsa ufa wa rabara kuti usagwedezeke panthawi yosungira ndi kuyendetsa ndikuwongolera kutuluka kwa ufa wa rabara (kutaya m'matumba a mapepala kapena akasinja).

4. Udindo wa dispersible polima ufa mu matope

The redispersible latex ufa amamwazikana mu filimu ndi amachita ngati kulimbikitsa wothandizira ngati chomatira chachiwiri;

Colloid yoteteza imatengedwa ndi matope (sidzawonongedwa ndi madzi pambuyo popanga mafilimu, kapena "kubalalitsidwa kwachiwiri";

Mafilimu opangidwa ndi polima utomoni amagawidwa mu matope dongosolo monga kulimbikitsa zinthu, potero kuwonjezera kugwirizana kwa matope;

5. Ntchito ya ufa wa polima wotayika mumatope onyowa:

Kupititsa patsogolo ntchito yomanga;

Kupititsa patsogolo kayendedwe kabwino;

Wonjezerani thixotropy ndi sag resistance;

onjezerani mgwirizano;