Nkuzi Mgbanwe nke EVA

Ethylene-vinyl acetate copolymer, nke a na-akpọ EVA, bụ plastik nke nwere monomers vinyl kristal na monomers vinyl acetate (VA) na-abụghị nke kristal. Mgbanwe EVA, ike ya, iguzogide mgbawa nrụgide, nghọta ya, na ndakọrịta ya na ihe ndị na-ejupụta ya ka mma karịa polyethylene (PE). Enwere ike ịmepụta EVA ka ọ bụrụ ngwaahịa dị iche iche site na usoro ịkpụzi ihe dịka extrusion.

Site na teknụzụ mgbanwe ngwakọta, enwere ike ime ka arụmọrụ EVA ka mma nke ọma, a pụkwara ịgbasa oke na mgbanwe nke ojiji ya. Iji mee ka onye ọ bụla ghọta ngwakọta na mgbanwe nke EVA, Xiaobian chịkọtara ihe ndị dị mkpa ka onye ọ bụla gụọ.

Ihe ndị na-emetụta arụmọrụ EVA.

01. Mmetụta nke Ọdịnaya VA na Arụmọrụ EVA

Mmetụta nke ọdịnaya VA na arụmọrụ nke EVA na-egosipụtakarị n'akụkụ abụọ.

① Ndị otu akụkụ Va na-ebibi mpaghara kristal nke akụkụ yinye polyethylene mepụtara, ka ọdịnaya VA na-abawanye, kristal nke EVA na-ebelata nwayọ nwayọ, mgbe ọdịnaya VA na-aga n'ihu na-abawanye ruo 40% ruo 50%, EVA copolymer na-aghọ usoro enweghị usoro kpamkpam;

② Ebe ọ bụ na VA bụ otu polar, ka ọdịnaya VA na-abawanye, polarity nke EVA na-abawanye, nke mere na ọtụtụ n'ime ihe onwunwe ya agbanweela, dịka ike nrụgide, iguzogide mgbanwe okpomọkụ, iguzogide nchara kemịkalụ na ihe ndị ọzọ ebelatala, ebe coefficient esemokwu permeability, iguzogide mgbawa nrụgide gburugburu ebe obibi na ihe ndị ọzọ emeziwanyela.

02. Mmetụta nke Nkesa Ibu Molekụla na Arụmọrụ EVA

EVA nwere oke nkesa molekul, agbụ ogologo dị mfe ijikọ onwe ha karịa agbụ mkpụmkpụ, molekul ogologo nwere ike ịmịkọrọ ọtụtụ ike mgbanwe ma gosipụta nzaghachi dị elu nke na-agbanwe agbanwe, yabụ EVA nwere oke nkesa molekul nwere nnukwu viscosity mgbe a na-etinye ya obere ihe mgbochi, nke na-adịghị mfe ịgba, mana ọ dị mfe ịgba. Na nhazi na mmepụta n'ezie, mmekọrịta viscosity/shear a n'ihi nkesa molekul dị iche iche ga-enwe mmetụta ụfọdụ na nhọrọ nke ihe ndị dị mkpa EVA.

Na mgbakwunye, mgbe ibu molekul nke EVA na-abawanye, ike nke ịgbado ọkụ, viscosity agbaze, mgbagọ, ike siri ike, iguzogide mgbawa nrụgide na ihe ndị ọzọ nke EVA na-aka mma.

03. N'eziokwu nke Ọkwa Njikọta nke Agbụ Molekụla na Arụmọrụ EVA

Ma e jiri ya tụnyere molekul EVA na PE, EVA na-emebi ọnọdụ kristal mbụ n'ihi mmalite nke alaka dị mkpụmkpụ nke otu polar mejupụtara n'ime agbụ molekul ndị nwere alaka, nke mere na EVA na-enwekarị "mmetụta plastik", na-amụba anya dị n'etiti agbụ molekul polymer, si otú a na-ebelata kristal nke polymer, na-eme ka EVA dị nro ma dịkwuo nro karịa PE; ihe mgbochi steric nke nhazi otu CH3COO na agbụ molekul EVA na-eme ka kristal na okpomọkụ iko dị iche na nke polyethylene dị ala (LDPE). Nkwụsi ike okpomọkụ, ịka nká na ihe ndị ọzọ metụtara anụ ahụ na igwe nke EVA na-emetụtakwa.

Ụzọ Mgbanwe nke EVA

01. Emegharịrị ihe

Ndochi bụ ụzọ dị mfe ma dị irè isi gbanwee polima, nke na-enweghị ike ịnọgide na-enwe uru nke polima ahụ n'onwe ya, kamakwa iji mmetụta njikọta ahụ melite ntụpọ ndị ahụ, iji mezuo ebumnuche nke imeziwanye arụmọrụ zuru oke nke polima ahụ. Ugbu a, mgbanwe ndochi nke EVA nwere usoro na-aga n'ihu na teknụzụ nano-functionalization na mgbanwe elu ihe nzacha.

① Ijupụta EVA na nkume hydrotal (LDHs) nwere ike ime ka ike mgbagọ nke EVA ka mma.

②Ijuputa EVA na magnesium hydroxide (Mg(OH)2) nwere ike ime ka nkwụsi ike okpomọkụ nke EVA ka mma, melite ike nrụgide na nhazi mmiri.

③ Mgbanwe nke ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe na-eme ka ọ dị ọkụ nke ọma (EVA) nwere ike ime ka ihe na-eme ka ọ dị ọkụ dịkwuo mma ma melite mmiri ya n'ime oke ụfọdụ.

④ NANO-SiO2 nwere obere ihe mejupụtara olu nke 4% nwere ike ime ka ike nrụgide nke ihe mejupụtara EVA/SiO2 dịkwuo elu.

Ụdị ihe e ji emeju ihe e ji emeju ihe na mgbanwe ihe e ji emeju ihe na EVA na-abawanye, mana ọtụtụ nsogbu ka dị na mgbanwe ihe e ji emeju ihe, otu esi eme ka mgbasa nke ihe e ji emeju ihe na EVA matrix ka mma, wdg. Mkpebi nke nsogbu ndị a na-enyere aka ime ka arụmọrụ EVA ka mma.

02. Mgbanwe Ngwakọta

Ịgwakọta na ịgbanwe EVA nwere ike ime ka njikọta nke njirimara nke polima dị iche iche dịkwuo mma, ka EVA wee nwee ike nweta ihe onwunwe ọhụrụ ma melite arụmọrụ nke akụkụ ụfọdụ. Ịgwakọta EVA na polima ndị ọzọ nwere ezigbo ndakọrịta bụ akụkụ dị mkpa nke nyocha mgbanwe EVA n'afọ ndị na-adịbeghị anya.

① Mgbe etinyere 15% EVA-g-MAH na sistemụ ngwakọta EVA/halogen-free flame retardant copoly polyester (P-PET), enwere ike imeziwanye ndakọrịta ya, usoro nhazi ya na retardant ọkụ.

② N'ime sistemụ ngwakọta EVA/polyethylene dị elu (HDPE), mgbe ọdịnaya HDPE dị 15%, ihe ndị dị na eriri na-agbagharị na ngwakọta kachasị mma.

③ Na sistemụ ngwakọta EVA/NBR, enwere ike nweta okpomọkụ kachasị elu nke mmebi okpomọkụ site na ịgbakwunye oxidized diisobenzotride (DCP).

Site na mmepe nke ọgbọ nke atọ nke teknụzụ polymer alloy, dị ka teknụzụ netwọkụ polymer interpenetrated, teknụzụ vulcanization dynamic,teknụzụ mmịpụta mmeghachi omume, teknụzụ nke mejupụtara molekul, wdg, a ga-emepụta ihe ngwakọta EVA arụmọrụ zuru oke ka mma iji mezuo ihe achọrọ nke teknụzụ injinia dị iche iche maka ihe.

03. Mgbanwe Ndị Ọzọ

Na mgbakwunye na nyocha ọdịnala gbasara mejupụta na ngwakọta nke EVA, enwewokwa ọganihu dị ukwuu na nyocha na njikọta kemịkalụ na njikọ nke EVA n'afọ ndị na-adịbeghị anya, nke atọọla ezigbo ntọala maka mmepe nke ọtụtụ ụdị ngwaahịa EVA.

① A na-eji Benzoyl peroxide (BPO) eme ihe dị ka ihe na-ejikọ ọnụ iji melite ọsọ mgbake ọdịdị nke ihe ahụ.

② E nwetara polima EVA-g-PU site na usoro ịgbaze agbaze, nke nwetara ike nrụgide na ogologo oge ka mma mgbe ezumike karịa ihe ndị e ji emepụta ihe. Na mgbakwunye nke PU prepolymers nwekwara ike ime ka arụmọrụ okpomọkụ nke EVA dịkwuo mma nke ọma.