Zvenyama Uye Kemikari Zvivakwa zvePolyethylene Resin
Zvenyama Uye Kemikari Zvivakwa zvePolyethylene Resin
Chemical Zvivakwa
Polyethylene ine kugadzikana kwakanaka kwemakemikari uye inoshingirira kuderedza nitric acid, dilute sulfuric acid uye chero huwandu hwehydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia mvura, amines, hydrogen peroxide, sodium hydroxide, potassium hydroxide, nezvimwe. mhinduro. Asi haidziviriri kune yakasimba oxidative corrosion, yakadai sefuming sulfuric acid, concentrated nitric acid, chromic acid uye sulfuric acid musanganiswa. Pakupisa kwekamuri, zvinonyungudutsa zvataurwa pamusoro apa zvishoma nezvishoma zvinosvibisa polyethylene, nepo pa 90-100 ° C, yakanyanyisa sulfuric acid uye yakanyanyisa nitric acid inokurumidza kuparadza polyethylene, zvichiita kuti iparadzwe kana kuora. Polyethylene iri nyore kuve mafoto-oxidized, thermally oxidized, yakaora neozone, uye nyore kushatiswa pasi pechiito che ultraviolet rays. Carbon dema ine yakanakisa mwenje kudzivirira maitiro pa polyethylene. Kuita senge cross-linking, chain scission, uye kuumbwa kwemapoka asina kukwana anogona kuitika mushure mekuvhenekera.
yokungoitawo ehupfumi
Iyo mechanical properties ye polyethylene ijeniral, kusimba kwesimba kwakadzikira, kuramba kunokambaira hakuna kunaka, uye kupikisa kwacho kwakanaka. Impact simba LDPE> LLDPE> HDPE, mamwe ma mechanic properties LDPE crystallinity uye hama molecular uremu, nekuvandudzwa kwezviratidzo izvi, maitiro ayo emagetsi anowedzera. Kushushikana kwezvakatipoteredza kutyora kuramba hakuna kunaka, asi kana huremu hwemamorekuru huchiwedzera, hunovandudza. Yakanaka puncture kuramba, pakati peiyo LLDPE ndiyo yakanyanya kunaka.
Mamiriro ezvakatipoteredza
Polyethylene ndeye alkane inert polymer ine yakanaka kugadzikana kwemakemikari. Inoshingirira mukuora neasidhi, alkali uye munyu aqueous solutions patembiricha yekamuri, asi isingadziviriri kune yakasimba oxidants senge oleum, concentrated nitric acid uye chromic acid. Polyethylene hainyunguswi muzvinonyungudutsa zvakajairika pasi pe 60°C, asi inozvimba kana kutsemuka mukubatana kwenguva refu nealiphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, etc. Kana tembiricha yadarika 60℃, inogona kunyungudika mune shoma mutoluene. , amyl acetate, trichlorethylene, turpentine, yangural mafuta uye parafini; kana tembiricha yakakwira kupfuura 100 ℃, inogona kunyungudika mu tetralmu.
Sezvo polyethylene mamorekuru ane zvishoma zvisungo zviviri uye ether zvisungo, kubuda kwezuva uye kunaya kunokonzeresa kukwegura, izvo zvinoda kuvandudzwa nekuwedzera antioxidants uye light stabilizers.
Maitiro ekugadzirisa
Nekuti LDPE neHDPE zvine fluidity yakanaka, tembiricha yakaderera, viscosity iri pakati nepakati, tembiricha yekuora yakaderera, uye haiori pakupisa kwakanyanya kwe300 ℃ mugasi inert, iwo mapurasitiki ane maitiro akanaka ekugadzirisa. Nekudaro, iyo viscosity yeLLDPE yakakwira zvishoma, uye simba remota rinoda kuwedzerwa ne20% kusvika 30%; inowanzonyunguduka kuputsika, saka zvakakosha kuti uwedzere kupera kwekufa uye kuwedzera rubatsiro rwekugadzirisa; tembiricha yekugadzira yakakwira zvishoma, kusvika pa200 kusvika 215 °C. Polyethylene ine kunyura kwemvura yakaderera uye haidi kuomeswa isati yagadziriswa.
Polyethylene melt isiri yeNewtonian fluid, uye viscosity yayo inoshanduka zvishoma nekushisa, asi inoderera nekukurumidza nekuwedzera kweshear rate uye ine hukama hwemutsara, pakati peiyo LLDPE ine inononoka kuderera.
Polyethylene zvigadzirwa zviri nyore kupenya panguva yekutonhora, saka, kutarisisa kunofanirwa kubhadharwa kune tembiricha yekuumbwa panguva yekugadzira. Kuti uchengetedze crystallinity yechigadzirwa, kuitira kuti ive nezvinhu zvakasiyana. Polyethylene ine hombe yekuumba shrinkage, iyo inofanirwa kutariswa pakugadzira mold.
Zvenyama Uye Kemikari Zvivakwa zvePolyethylene Resin