Dzidziso yekuchinja yeEVA

Ethylene-vinyl acetate copolymer, yakapfupikiswa seEVA, ipurasitiki inoumbwa nema non-polarity, crystalline vinyl monomers uye non-crystalline vinyl acetate (VA) monomers. Kuchinjika, kuomarara, kuramba kupwanyika kwestress, kujeka, uye kuenderana nemafillers zviri nani pane polyethylene (PE). EVA inogona kugadzirwa kuita zvigadzirwa zvakasiyana-siyana kuburikidza nemaitiro ekuumba akadai se extrusion.

Kuburikidza netekinoroji yekugadzirisa musanganiswa, mashandiro eEVA anogona kuvandudzwa zvinobudirira, uye huwandu uye kuchinjika kwekushandiswa kwayo kunogona kuwedzerwa. Kuti munhu wese anzwisise kusanganiswa nekugadzirisa kweEVA, Xiaobian akaunganidza zvinhu zvakakodzera kuti munhu wese averenge.

Zvinhu zvinokanganisa mashandiro eEVA.

01. Mhedzisiro yeVA Content paEVA Performance

Kukanganiswa kwezviri muVA pakushanda kweEVA kunonyanya kuratidzwa muzvikamu zviviri.

① Mapoka eVa anoparadza nzvimbo yekristaro inoumbwa nechikamu che polyethylene cheni, nekuwedzera kwehuwandu hweVA, kristaro yeEVA inoderera zvishoma nezvishoma, kana huwandu hweVA huchiramba huchiwedzera kusvika 40% kusvika 50%, EVA copolymer inova chimiro chisina kurongeka zvachose;

② Sezvo VA iri boka re polar, nekuwedzera kwehuwandu hweVA, polarity yeEVA inokura, zvekuti hunhu hwayo hwakawanda hwachinja, hwakadai sekusimba kwekusimba, kuramba kupisa, kuramba ngura kwemakemikari nezvimwe hunhu hwaderera, nepo permeability friction coefficient, kuramba kuputika kwemhepo nekumanikidzwa kwezvakatipoteredza nezvimwe hunhu hwavandudzika.

02. Mhedzisiro yekugoverwa kwehuremu hwemamorekuru pakushanda kweEVA

EVA ine kugoverwa kwakakura kwehuremu hwemamorekuru, cheni refu dziri nyore kusanganisana kupfuura cheni pfupi, uye mamorekuru echeni refu anogona kupinza simba rakawanda rekuchinja uye kuratidza mhinduro yakakwira, saka EVA ine kugoverwa kwakakura kwehuremu hwemamorekuru ine kupenya kukuru kana ikashandiswa zvishoma pakuchekwa, izvo zvisiri nyore kuyerera, asi zviri nyore kuyerera. Mukugadzirisa chaiko uye kugadzirwa, hukama uhwu hwekupenya/kuchekwa hunokonzerwa nekugoverwa kwakasiyana kwehuremu hwemamorekuru huchava nemhedzisiro pakusarudzwa kwezvinhu zveEVA.

Pamusoro pezvo, kana huremu hweEVA hukawedzera, simba rekupisa, kunyunguduka, kutsauka, kuomarara, kuramba kupwanyika kwesimba, nezvimwewo zveEVA zvinovandudzika.

03. Kukanganisa kweChikamu cheMaketani eMolecular pakushanda kweEVA

Zvichienzaniswa nemamorekuru eEVA nePE, EVA inokanganisa mamiriro ekutanga ecrystallization nekuda kwekuunzwa kwematavi mapfupi akaumbwa nemapoka epolar mumaketani ane matavi emamorekuru, zvekuti EVA inowanzoita "plasticizing effect", ichiwedzera daro pakati pemaketani emamorekuru epolymer, nokudaro ichideredza crystallinity yepolymer, zvichiita kuti EVA ive yakapfava uye inonamira kupfuura PE; chipingamupinyi chespatial steric chekuumbwa kweboka reCH3COO paEVA molecular chain chinoita kuti crystallinity negirazi tembiricha zvakasiyana neiyo yelow-density polyethylene (LDPE). Kugadzikana kwekupisa, kukwegura uye zvimwe zvinhu zvemuviri uye zvemakanika zveEVA zvinokanganiswawo.

Nzira yekushandura yeEVA

01. Zadza Rakagadziriswa

Kuzadza inzira iri nyore uye inoshanda yekugadzirisa polymer, iyo isingangogone kuchengetedza mabhenefiti epolymer pachayo, asiwo kushandisa simba rekuwedzera zvikanganiso, kuzadzisa chinangwa chekuvandudza mashandiro akazara epolymer. Parizvino, kushandurwa kwekuzadza kweEVA kune mafambiro ekuita nano-functionalization uye filler surface modification technology.

① Kuzadza EVA nematombo emvura (LDHs) kunogona kuwedzera simba rekukombama kweEVA.

②Kuzadza EVA nemagnesium hydroxide (Mg(OH)2) kunogona kuvandudza kugadzikana kwekupisa kweEVA, kuwedzera simba rekudhonza uye kuyerera kwekushanda kwayo.

③ Kugadziriswa kweEVA hot melt adhesive ne ferric oxide (Fe3O4) particles kunogona kuvandudza kunamira kwehot melt adhesive uye kuvandudza kuyerera kwayo mukati meimwe nzvimbo.

④ NANO-SiO2 ine chikamu chekuzadza che4% inogona kuwedzera simba rekudhonza rezvinhu zvakagadzirwa neEVA/SiO2.

Mhando dzemafiller anoshandiswa pakugadzirisa EVA filler dziri kuramba dzichiwedzera, asi kuchine matambudziko akawanda mukugadzirisa filler, maitiro ekuvandudza kupararira kwemafiller muEVA matrix, nezvimwewo. Kugadziriswa kwematambudziko aya kunobatsira kuwedzera kushanda kweEVA.

02. Kuchinja Kusanganisa

Kusanganisa nekugadzirisa EVA kunogona kugadzirisa musanganiswa wehunhu hwemapolymer akasiyana, kuitira kuti EVA iwane hunhu hutsva uye ivandudze mashandiro echimwe chinhu. Kusanganisa EVA nemamwe mapolymer ane hukama hwakanaka chinhu chakakosha mukutsvagisa kwekugadzirisa EVA mumakore achangopfuura.

① Kana 15% EVA-g-MAH ikaiswa muEVA/halogen-free flame retardant copoly polyester (P-PET) blend system, inoenderana, kufamba kwayo uye kunonoka kwemurazvo zvinogona kuvandudzwa.

② Muhurongwa hwekusanganisa hweEVA/high-density polyethylene (HDPE), kana huwandu hweHDPE huri 15%, hunhu hwemuchina wekutenderera neshinda dzakasanganiswa ndihwo hwakanakisa.

③ MuEVA/NBR blend system, tembiricha yepamusoro yekuora kwemafuta inogona kuwanikwa nekuwedzera oxidized diisobenzotride (DCP).

Nekuvandudzwa kwechizvarwa chechitatu chetekinoroji yepolymer alloy, senge tekinoroji ye polymer network yakapindirana, tekinoroji ye dynamic vulcanization,tekinoroji yekuwedzera maitiro, tekinoroji yemakemikari akabatanidzwa, nezvimwewo, mashandiro akawandisa uye ari nani ekubatanidza EVA zvinhu zvichagadzirwa kuti zvienderane nezvinodiwa netekinoroji dzakasiyana dzeinjiniya yezvinhu.

03. Dzimwe shanduko

Pamusoro pekutsvagisa kwechinyakare pakuzadza nekushandura EVA, kwave nekufambira mberi kukuru mukutsvagisa mukubatanidza nekubatanidza EVA nemakemikari mumakore achangopfuura, izvo zvakaisa hwaro hwakanaka hwekuvandudzwa kwemhando dzakasiyana dzezvigadzirwa zveEVA.

① Benzoyl peroxide (BPO) inoshandiswa senzira yekubatanidza zvinhu kuti iwedzere kudzoreredza chimiro chazvo.

② EVA-g-PU polymer yakawanikwa nenzira yekunyungudutsa grafting, iyo yakawana simba rekusimba uye kureba kuri nani pakuputsika kupfuura zvinhu zvakagadzirwa. Uye kuwedzerwa kwePU prepolymers kunogonawo kuvandudza mashandiro ekupisa kweEVA.