Chii chinonzi redispersible latex powder?

Danho rekutanga mukugadzira redispersible polymer poda kugadzira polymer dispersion, inozivikanwawo semulsion kana latex. Muchiitiko ichi, mvura-emulsified monomers (yakasimbiswa ne emulsifiers kana macromolecular protective colloids) inobata nevanotanga kuti vatange emulsion polymerization. Kuburikidza nekuita uku, mamonomers anobatanidzwa kuita mamorekuru-cheni mamorekuru (macromolecules), kureva mapolymers. Munguva iyi yekuita, monomer emulsion madonhwe anoshanduka kuita polymer "yakasimba" zvidimbu. Mumapolymer emulsion akadai, iwo anodzikamisa pachikamu chepasi anofanirwa kudzivirira latex kubva munzira ipi neipi kubatana uye nekudaro kukanganisa. Musanganiswa wacho unobva wagadzirirwa kupfapfaidza kuomeswa nekuwedzera zvakasiyana-siyana, uye kuwedzerwa kwekudzivirira colloids uye anti-caking agents inobvumira iyo polymer kuti iite poda yakasununguka inogona kuparadzirwa mumvura mushure mekupfapfaidza kuoma.

Iyo redispersible latex poda inogovaniswa mune yakanyatso kusanganiswa yakaoma poda dhaka. Mushure mokunge dhaka yasanganiswa nemvura, polima yehupfu inoparadzirwa zvakare mumucheka mutsva wakasanganiswa uye emulsified zvakare; nekuda kwe hydration ye simenti, evaporation pamusoro uye / kana kubatwa kwechigadziko chepasi, mapeji emukati akasununguka Kushandiswa kunoramba kuripo kwemvura kunoita kuti latex particles iome kuti iite mvura-isingasviki firimu inopfuurira mumvura. Iyi firimu inoenderera inoumbwa nekubatanidzwa kwezvikamu zvimwechete zvakapararira mu emulsion kupinda mumuviri wakafanana. Kuti igone kugonesa redispersible latex poda kuti igadzire firimu mudhaka rakaomarara, inofanirwa kuve nechokwadi chekuti tembiricha yekugadzira firimu yakadzikira pane inorapa tembiricha yedhaka rakagadziridzwa.

Iyo chidimbu chimiro cheiyo redispersible polymer poda uye yayo-yekugadzira firimu zvimiro mushure mekuparadzirwa patsva inoita kuti zvikwanise kuve neanotevera mhedzisiro pakuita kwedhaka munzvimbo nyowani uye yakaoma:

1. Kushanda mumatope matsva

◆ Iyo "lubricating effect" yezvimedu inoita kuti musanganiswa wedhaka uve nemvura yakanaka, kuitira kuti uwane kushanda kwekuvaka kwakanaka.

◆ Mhepo-intraining effect inoita kuti dhaka rigadzikane, zvichiita kuti troweling zvive nyore.

◆ Kuwedzera marudzi akasiyana-siyana e-redispersible latex powder anogona kuwana dhaka rakagadziridzwa nepurasitiki iri nani kana kuti yakawanda viscous.

2. Kushanda mudhaka rakaoma

◆ Firimu ye latex inogona kuvhara kuputika kwe shrinkage pa-base-mortar interface uye kuporesa kuputika kwekuputika.

◆ Kuvandudza kuvharika kwedhaka.

◆ Kuvandudza kusimba kwakabatana kwedhaka: kuvapo kwepamusoro-soro uye yakanyanyisa elastic polymer nzvimbo inovandudza kushanduka uye elasticity yedhaka,

Inopa yakabatana uye ine simba maitiro kune akaomarara skeleton. Kana simba rikaiswa, nekuda kwekuvandudzwa kuchinjika uye elasticity iyo

Microcracks inononoka kusvika kushushikana kwakanyanya kwasvika.

◆ Interwoven polymer domains inotadzisawo kubatana kwe microcracks mukupinda mukati. Naizvozvo, iyo redispersible polymer poda inovandudza kutadza kushushikana uye kutadza dhizaini yechinhu.

Izvo zvinodikanwa kuwedzera redispersible latex poda kuomesa simende dhaka, nekuti redispersible latex poda inonyanya kuve neanotevera mabhenefiti matanhatu, uye inotevera sumo kwauri.

1. Kuvandudza simba rekubatanidza uye kubatana

Redispersible latex poda inoita basa rakakura mukuvandudza kusimba kwekubatanidza uye kubatana kwezvinhu. Nekuda kwekupinda kwezvikamu zvepolymer mumapores uye capillaries esimende matrix, kubatana kwakanaka kunoumbwa mushure memvura ine simenti. Iyo polymer resin pachayo ine yakanakisa zvivakwa. Inonyanya kushanda mukuvandudza kunamatira kwezvigadzirwa zvesimende kune ma substrates, kunyanya kusabatana kwakashata kwemainorganic binders senge simende kune organic substrates sehuni, fiber, PVC, uye EPS.

2. Kuvandudza kugadzikana kwechando-thaw uye zvinobudirira kudzivirira kuputika kwezvinhu

Redispersible latex poda, iyo plasticity ye thermoplastic resin yayo inogona kukunda kukuvadzwa kunokonzerwa nekuwedzera kwekupisa uye kudhonzwa kwesamende dhaka zvinhu zvinokonzerwa nekusiyana kwekushisa. Kukunda maitiro ehombe yakaoma shrinkage uye kuputika nyore nyore kwesamende dhaka, inogona kuita kuti zvinhu zvigadzirike, zvichiita kuti zvigadzirise kugadzikana kwenguva refu kwezvinhu.

3. Kuvandudza kukotama uye kusagadzikana kwekudzivirira

Mune skeleton yakaoma yakaumbwa mushure mekunge simende yedhaka yave hydrated, iyo polymer membrane yakanyungudika uye yakaoma, uye inoshanda semubatanidzwa unofambiswa pakati pemasimende edhaka zvimedu, izvo zvinokwanisa kumira zvakanyanya deformation mitoro uye kuderedza kushushikana. Kuwedzera tensile uye kukotama kuramba.

4. Kuvandudza kukanganisa kwemaitiro

Redispersible latex powder is thermoplastic resin. Iyo firimu rakapfava rakaputirwa pamusoro pevhu revhu rinogona kutora kukanganiswa kwesimba rekunze uye kuzorora pasina kutyora, nekudaro kuvandudza mhedzisiro yekudzivirira kwedhaka.

5. Kuvandudza hydrophobicity uye kuderedza kunyura kwemvura

Kuwedzera cocoa redispersible polymer poda inogona kuvandudza microstructure yesamende dhaka. Iyo polymer yayo inoumba network isingadzokerike panguva ye simenti hydration process, inovhara iyo capillary mune simende gel, inovhara kupinda kwemvura, uye inovandudza kusamira.

6. Kuvandudza kupfeka kusagadzikana uye kusimba

Kuwedzera redispersible latex poda inogona kuwedzera compactness pakati pesimende dhaka zvimedu uye polymer firimu. Kukwidziridzwa kwesimba rakabatana kunonatsiridza kugona kwedhaka kuti rimire kushushikana kweshear, kunoderedza chiyero chekupfeka, kunonatsiridza kuramba kwekupfeka, uye kurebesa hupenyu hwebasa redhaka.