Hydroxypropyl Methyl Cellulose (HPMC)inowanzoshandiswa mvura-soluble cellulose ether, iyo inoshandiswa zvakanyanya mukuvaka zvinhu, machira, mishonga uye zvokudya. Mune simende-yakavakirwa zvivakwa zvekuvaka, HPMC, sechigadziriso, inowanzowedzerwa kune simende dhaka kuti ivandudze mashandiro ayo, kunyanya mukugadzira uye kushandiswa. Iyo ine simba rakakosha pamvura, kuchengetwa kwemvura, kushanda uye kutsemuka kuramba kwedhaka.

 

1. Mhedzisiro yeHPMC pane fluidity yesamende dhaka
Iyo fluidity yesamende dhaka chiratidzo chakakosha chekuyera kuita kwayo kwekuvaka, iyo inokanganisa zvakananga kushanda kwekuvaka uye kunaka. Sechinhu chepolymer, HPMC ine yakanaka solubility yemvura uye chiitiko chepamusoro. Mushure mekuwedzera kune simende dhaka, inogona kuumba firimu rakatetepa kuburikidza ne intermolecular interactions, kuwedzera viscosity yedhaka, uye nokudaro kuvandudza fluidity uye kushanda kwedhaka. Kunyanya, HPMC inogona kunyatso gadzirisa kuwirirana kwedhaka, zvichiita kuti zvive nyore kuisa uye kugovera zvakaenzana panguva yekuvaka, kudzivirira matambudziko ekuvaka anokonzerwa nekuoma-kuoma kwedhaka.

HPMC inogona zvakare kuwedzera iyo yakavhurika nguva yedhaka, ndiko kuti, kuwedzera nguva yekushandiswa kwedhaka panguva yekuvaka, uye kudzivirira mhedzisiro yekuvaka yakakanganiswa nekumhanya kwakanyanya kubuda kwemvura, kunyanya mukupisa kwakanyanya uye kwakaoma nharaunda.

 

2. Mhedzisiro yeHPMC pakuchengetedza mvura yesamende dhaka
Kuchengetedzwa kwemvura kwesamende dhaka kwakakosha pakuoma kwayo nekusimbaradza kwayo. Sezvo simenti hydration process inoda mvura yakakwana, kana kurasikirwa kwemvura kwedhaka kwakakurumidza uye simenti hydration isina kukwana, ichakanganisa zvakananga simba rekupedzisira uye kusimba kwedhaka. HPMC inogona kunyatso kuvandudza kuchengetwa kwemvura kwedhaka. Iwo hydroxypropyl uye methyl mapoka ari mune ayo mamorekuru chimiro ane yakasimba hydrophilicity, iyo inogona kugadzira yunifomu yekuchengetedza mvura mudhadha uye kuderedza chiyero chekubuda kwemvura.

Kunyanya mukupisa kwakanyanya uye kwakadzika humidity nharaunda, kuwedzera kweHPMC kunogona kunonoka zvakanyanya kuomeswa kwesamende dhaka, kuve nechokwadi chekuzara kwesamende, uye nekudaro kuvandudza simba rekupedzisira uye kutsemuka kuramba kwedhaka. Zvidzidzo zvakaratidza kuti kusimba kwesimba uye kusimba kwedhaka ine huwandu hwakakodzera hweHPMC yakawedzerwa kazhinji zviri nani pane izvo zvisina HPMC mukuomesa kwenguva refu.

 

3. Mhedzisiro yeHPMC pane kutsemuka kuramba kwesamende dhaka
Kutsemuka idambudziko rakajairika rinokanganisa kunaka kwesamende dhaka, kunyanya pasi pesimba rezvinhu zvakadai sekuomesa shrinkage, kushanduka kwekushisa, uye masimba ekunze, dhaka rinowanzo kuputika. Kuwedzerwa kweHPMC kunogona kunyatso kuvandudza kutsemuka kwedhaka, kunyanya kuburikidza nezvinotevera zvinhu:

Kuvandudza elasticity uye plasticity yedhaka: HPMC ine imwe elasticity uye plastikiity, iyo inogona kudzoreredza kushushikana kunokonzerwa nekuomesa shrinkage panguva yekurapa maitiro edhaka, nekudaro ichideredza kuitika kwekutsemuka.
Wedzera kunamatira uye kusimba kwesimba redhaka: HPMC inogona kukwidziridza kunamatira uye kusimba kwesimba redhaka, kunyanya kana iyo substrate yepamusoro isina kuenzana kana iyo substrate adhesion isina kunaka.
Kudzora simende hydration rate: Nekudzora simenti hydration rate, HPMC inogona kunonoka kurasikirwa kwakanyanya kwemvura mudhaka resimende uye kuderedza shrinkage stress inokonzerwa nekukurumidza kubuda kwemvura, zvichidaro ichidzivirira kuitika kwekutsemuka.

 

4. Mhedzisiro yeHPMC pakusimba uye kusimba kwesamende dhaka
Ichiri kuvandudza kushanda uye kutsemuka kuramba kwesamende dhaka, HPMC inewo imwe mhedzisiro pakusimba kwayo uye kusimba. Kunyangwe kuwedzera kweHPMC kuchizoderedza zvishoma simba rekutanga redhaka nekuti chimiro chayo chemomecular chinotora chikamu chemvura inodiwa simende hydration, nekufamba kwenguva, HPMC inobatsira iyo yakazara hydration yesimende, nekudaro ichivandudza simba rekupedzisira redhaka.

Pamusoro pezvo, HPMC inogona kuvandudza kupindirana kwekusamira kwesamende dhaka, kuderedza kukukurwa kwedhaka nemvura kana makemikari, uye kuwedzera kusimba kwayo. Izvi zvinoita kuti dhaka rine HPMC riwedzere kuita zvirinani kwenguva refu munzvimbo dzakanyorova kana dzinoparadza, kunyanya yakakodzera kushongedza kwekunze kwemadziro, paving pasi nemimwe minda.

 

5. Tarisiro yekushandiswa kweHPMC mune simende-based kuvaka zvinhu
Nekuwedzera kuri kuda kwedhaka rekuita-pamusoro muindasitiri yekuvaka, HPMC, sechinhu chakakosha chekuwedzera, yakaratidza tarisiro yakafara yekushandiswa mune simende-yakavakirwa zvinhu zvekuvaka. Pamusoro pechinyakare mashandisirwo akadai semadziro plastering uye pasi dhaka, HPMC inogona zvakare kushandiswa mukugadzira yekuzvimisikidza dhaka, kugadzirisa dhaka, yakaoma-yakasanganiswa dhaka uye zvimwe zvigadzirwa kuti uwedzere kuvandudza kushanda kwedhaka.

Nekuvandudzwa kwezvinodiwa pakuvaka kuchengetedza kwezvakatipoteredza uye kuenderera mberi, iyo yakaderera kusvibiswa uye yakaderera VOC (volatile organic compound) maitiro eHPMC anoitawo kuti ive neyakakura mukana wekushandisa mune zvakasvibirira zvekuvakisa. Panguva imwecheteyo, nekuenderera mberi kwekuvandudza matekinoroji ane hukama, gadziridzo uye mafomu ekushandisa eHPMC anozove akasiyana, achipa mikana yakawanda yekuvandudza uye kusimudzira simende-yakavakirwa zvinhu zvekuvaka.

 

Seyakakosha sement mortar modifier, hydroxypropyl methylcellulose (HPMC) inonyanya kunatsiridza mashandiro ekuvaka uye kushandisa simende-based zvivakwa zvekuvaka kuburikidza nekuvandudza fluidity, kuchengetedza mvura, kusagadzikana kwekuputika uye simba redhaka. Nekuenderera mberi kwekuvandudzwa kwezvinodiwa zvekuvaka, huwandu hwekushandisa hweHPMC huchawedzerwa, huchive chimwe chezvinhu zvakakosha mukusimudzira kuvandudzwa kwezvinhu zvemazuva ano zvekuvaka.