Dab tsi yog qhov txawv ntawm PVC thiab EVA cov ntaub ntawv?

Nrog rau kev loj hlob zuj zus ntawm lub sijhawm, tib neeg lub neej tau hloov pauv ntau, thiab kev siv ntau yam khoom siv tshiab tau dhau los ua ntau dua. Piv txwv li, PVC thiabEVACov ntaub ntawv tshwj xeeb yog siv dav hauv lub neej niaj hnub no, tab sis feem ntau cov neeg yooj yim tsis meej pem. . Tom ntej no, cia peb nkag siab qhov txawv ntawm PVC thiab EVA cov ntaub ntawv.

1. Cov tsos thiab kev ntxhib los mos sib txawv:
PVC hauv Suav teb loj tuaj yeem muab faib ua ob hom: tsis tshua muaj tshuaj lom thiab ib puag ncig tus phooj ywg thiab tsis muaj tshuaj lom thiab ib puag ncig tus phooj ywg. EVA cov ntaub ntawv yog tag nrho cov ntaub ntawv zoo ib puag ncig. Qhov saum npoo ntawm EVA yog mos; nws tensile toughness muaj zog dua li ntawm PVC, thiab nws xav tias nplaum (tab sis tsis muaj kua nplaum rau ntawm qhov chaw); nws yog dawb thiab pob tshab, thiab pob tshab Siab, qhov kev xav thiab kev xav zoo ib yam li PVC zaj duab xis, yog li yuav tsum tau them nyiaj rau qhov txawv ntawm lawv.

2. Cov txheej txheem sib txawv:
PVC yog ib qho thermoplastic resin polymerized los ntawm vinyl chloride nyob rau hauv qhov kev txiav txim ntawm tus pib. Nws yog homopolymer ntawm vinyl chloride. Vinyl chloride homopolymer thiab vinyl chloride copolymer yog sib sau ua ke hu ua vinyl chloride resin. PVC yog ib zaug uas yog cov khoom siv dav siv dav hauv ntiaj teb thiab tau siv dav. Cov mis mos molecular ntawm EVA (ethylene vinyl acetate copolymer) yog C6H10O2 thiab nws qhov hnyav molecular yog 114.1424. Cov khoom siv no yog siv los ua ntau yam yeeb yaj kiab, cov khoom ua npuas ncauj, cov nplaum kub yaj thiab cov khoom siv polymer.

3. Txawv softness thiab hardness: lub ntuj xim ntawm PVC yog me ntsis daj, translucent thiab ci. Lub pob tshab yog zoo dua li polyethylene thiab polystyrene, tab sis phem dua polystyrene. Nyob ntawm tus nqi ntawm cov khoom ntxiv, nws muab faib ua cov mos thiab tawv polyvinyl chloride. Cov khoom muag muag yog hloov tau thiab tawv thiab hnov ​​​​ntxhiab, thaum cov khoom tawv tawv muaj zog dua li cov polyethylene tsawg. , thiab qis dua polypropylene, whitening yuav tshwm sim ntawm inflection point. EVA (ethylene vinyl acetate copolymer) yog softer dua PVC.

4. Cov nqi sib txawv:
Cov khoom siv PVC: Tus nqi ib tuj yog nyob nruab nrab ntawm 6,000 thiab 7,000 yuan. EVA cov ntaub ntawv muaj qhov sib txawv thicknesses thiab tus nqi. Tus nqi yog kwv yees li 2,000 / cubic meter.

5. Cov yam ntxwv sib txawv:
PVC muaj cov khoom siv hluav taws xob zoo, tuaj yeem siv los ua cov khoom siv hluav taws xob tsawg tsawg, thiab nws cov tshuaj lom neeg ruaj khov kuj zoo. Vim tias qhov tsis zoo thermal stability ntawm polyvinyl chloride, cua sov mus sij hawm ntev yuav ua rau decomposition, tso HCl roj, thiab discoloration ntawm polyvinyl chloride. Yog li ntawd, nws daim ntawv thov ntau yog nqaim, thiab kev siv kub yog feem ntau ntawm -15 thiab 55 degrees. EVA yog khoom nyob rau hauv chav tsev kub. Thaum rhuab, nws yaj mus rau ib qho twg thiab dhau los ua cov kua uas tuaj yeem ntws thiab muaj qee yam viscosity.