Butadiene acrylonitrile roj hmab: Properties, npaj, daim ntawv thov

Looj-butadiene roj hmab (NBR), - qhov yooj yim raw khoom rau zus tau tej cov saib txhua yam ntawm roj hmab nrog pom stability. Nws yog ib tug hluavtaws polymeric khoom tau los ntawm copolymerization ntawm butadiene nrog acrylonitrile (Nak). Nws yuav hu ua looj, looj-butadiene, styrene-butadiene roj hmab los yog butakrilom. Thoob teb chaws, qhov no los muaj ib tug npav khoom NBR (looj-butadienerubber), nyob rau hauv domestic - NBR (looj hluavtaws roj hmab).

qhov uas siv tau

Qhov no hom rubbers yog feem ntau siv nyob rau hauv qhov chaw kev lag luam qhov twg nws yog ib qho tseem ceeb zoo stability ntawm roj hmab khoom mus sib txhoj puab heev media. Ntawm kuj zoo kawg tseem ceeb yog lub thaj chaw ntawm xws butadiene-looj roj hmab, xws li cov elasticity thiab ib tug me me tas mus li deformation. Qhov no cov ntaub ntawv uas yog dav siv nyob rau hauv zus tau tej cov roj hmab ntsiab uas yog nyob rau hauv ncaj qha kev sib cuag nrog lub sib active khoom - tej zaum nws yuav ua tau tag nrho cov hom ntawm cov ntsaws ruaj ruaj, gaskets, roj hmab expansion pob qij txha, roj roj hoses, tsav koj cov menyuam, cov roj, lub tsheb tso tsheb hlau luam, huab cua thiab roj kev lag luam, printing offset phaj thiab lwm yam khoom.

Khoom manufactured nyob rau hauv lub hauv paus ntawm no roj hmab tsis swell nyob rau hauv oily kua, dej ntsuab thiab dej. Ib txhia hom xws li ib tug cov ntaub ntawv uas yog ua hluav taws xob thaiv sheath thiab roj hmab cov hnab looj tes uas muaj tshwj xeeb siab zog thiab hnav kuj. Nws siv nyob rau hauv qhuav ntawm ntau yam adhesives, sealants thiab los ua ke ua npuas ncauj. Roj Hmab yog lub hauv paus nyob rau hauv qhuav ntawm adhesives.

Thaum twg thiab nyob qhov twg puas tau qhov no roj hmab?

Tau NBR twb kaw nyob rau hauv 1934 nyob rau hauv lub teb chaws Yelemees. Nyob rau ntawm lub sij hawm, German zaum tau tsim ib tug tshwj xeeb cov ntaub ntawv uas muaj zog thiab patented nws nyob rau hauv lub npe buna-N. Thaum lub sij hawm ob ntiaj teb rog, cov khoom tshiab tau ua tsis tshua muaj nrov nyob rau hauv cov tub rog hom kev lag luam.

Vim tsis muaj natural resources lub siab tshaj plaws US tsoom fwv tau launched ib tug tshwj xeeb kev pab cuam, uas implies active kev loj hlob ntawm zus tau tej cov looj roj hmab thiab lwm yam khoom cua raw cov ntaub ntawv rau roj hmab. Manufactured nyob rau hauv qhov kev pab cuam cov ntaub ntawv uas twb hu ua GR-N. Rau hnub tim, BOC kuj yog ib qho ntawm feem nrov tshwj xeeb-lub hom phiaj rubbers. Nws yuav ua nyob rau hauv ntau tshaj li 20 lub teb chaws nyob ib ncig ntawm lub ntiaj teb no.

zus tau tej cov BOC

Qhov no hom ntawm cov ntaub ntawv uas yog ua los ntawm constructive polymerization nyob rau hauv aqueous emulsion. Cov txheej txheem yog nqa tawm ob nyob rau high school thiab tsawg kub. Lub ntsiab monomers rau lawv lawm - yog 1,3-butadiene thiab acrylonitrile (NAC), tov nyob rau hauv ib tug tej yam kev faib ua feem. Cov tshuaj tsis yog nyob ntawm seb kub. Noj rau hauv cov nyiaj rau cov kev cai ntawm statistical copolymerization, nws yuav tsum tau muab sau tseg hais tias qhov no tandem monomers yuav tsum muaj cov khoom ntawm ib tug azeotropic muaj pes tsawg leeg muaj txog 40% acrylonitrile nyob rau hauv lub monomer sib tov.

Nyob rau hauv zus tau tej cov no yam roj hmab yuav tsim nyog thaum zoo purification ntawm coagulation emulsifiers siv rau polymerization. Lub rubbers ua pub ib tug me me npaum li cas ntawm cov mineral tshauv thiab volatile impurities (nyiaj pab ntau tshaj 1%). Lawv yuav tsum tau ntsaws tsuas los yog uas tsis yog-tsuas antioxidants.

Yuav ua li cas yog BNK

Nyob rau hauv peb lub teb chaws, manufactured roj hmab hom xws li NBR-18 (SKN-18), NBR-26 (SKN-26) thiab butadiene-acrylonitrile roj hmab 40 (SKN-40). Tus nab npawj qhia nyob rau hauv lub stamp qhia tus xov tooj ntawm acrylonitrile units nyob rau hauv lub polymer. Lawv tej zaum yuav muaj feem 18, 26 los yog 40% ntawm acrylonitrile.

By ua tus xov tooj ntawm constituent Cheebtsam, koj yuav cuag tau ntau yam khoom ntawm lub resultant khoom. Nyob ntawm seb qhov feem pua ntawm acrylonitrile rubbers zog tej zaum yuav hloov nyob rau hauv hardness, cov viscosity ntawm cov roj - thiab petrol-resistant. Qhov feem pua ntawm NAC muaj feem xyuam rau cov intermolecular los units. Qhov no zoo tshaj muaj feem xyuam rau cov kev siv ntawm butadiene looj roj hmab nyob rau hauv ntau yam teb ntawm lub teb chaws kev khwv nyiaj txiag. Cuaj kaum, nws yog siv raws li ib tug raw khoom rau qhov siv thiab ua ib tug loj ntau yam ntawm roj hmab cov khoom rau industrial siv.

disadvantages khoom

Txawm tias muaj tseeb hais tias cov roj hmab khoom manufactured nrog rau qhov sib ntxiv ntawm BOC muaj ib tug tag nrho pawg ntawm zoo heev zoo (siab zog thiab tensile ductility, elongation, tsim kua muag kuj thiab abrasion kuj, roj zoo heev rau thiab petrol-resistant), yog muaj rau cov khoom no thiab ib co tsis zoo.

Tighter kev khiav hauj lwm tej yam kev mob txuam nrog ib qho kev nce nyob rau hauv lub tshaj tawm los ntawm lub cua txias mechanisms thiab tsis muaj ntawm cov roj ua rau lub fact tias roj hmab ntsiab tsuas khiav lag luam ntawm kub txog li 150 degrees. Los ua lub khiav hauj lwm kub saum toj no cov nqi no, cov structuring, thiab ces tus roj hmab puas tsuaj tsim raws li BNK. Nyob rau hauv lwm yam lus, lub rhuab roj hmab yuav nyuaj thiab nkig.

Tsis tshua muaj kub kuj adversely muaj feem xyuam rau cov roj hmab khoom, uas yog siv nyob rau hauv qhuav ntawm looj roj hmab. Qhov zoo tshaj plaws rau lawv yog cov kub yog hauv qab no -35˚S.

Niaj hnub nimno versions rubbers

Yuav kom tsim roj hmab khoom, nrog ib tug cim txheej ntawm thaj chaw uas thov ntau tshaj kev hloov kho ntawm rubbers. Ib qho ntawm feem pheej uas nyob rau hauv qhov suav hais tias kev hloov kho ntawm hydrogenated looj butadiene rubbers. Lawv muaj zoo heev ua zog nyob rau hauv ntau hom roj hmab lawm.

Log Tsheb ua raws li nyob rau hauv hloov rubbers, polyvinyl tshuaj dawb, muab ib tug ruaj khov kev ntsuas ntawm huab cua durability (-50 degrees) thiab huab khiav hauj lwm kub txog li 160 degrees. Nws yog ntau superior rau cov khoom uas siv manufactured nyob rau hauv lub hauv paus ntawm butadiene-looj rubbers, rau kua muag kuj thiab abrasion kuj. Nws muaj zoo heev tsis kam mus rau active sib txhoj puab heev tej kev kawm. Txawm li cas los, qhov no roj hmab yog tsis raws li muaj zog thiab resilient. Yog li ntawd, los txhim kho lub hauj thaj chaw ntawm cov khoom, nws yog feem ntau siv nyob rau hauv ua ke nrog nrog pa hom looj-butadiene rubbers.

vulcanization

Tus txheej txheem ntawm vulcanization ntawm looj butadiene roj hmab los ntawm txoj kev leej faj thiab thiuram, organic peroxides, resins alkilfenolformaldegidnyh thiab organochlorines. Kub yuav sib txawv ntawm 140˚ rau 190˚ Celsius. Nyob rau hauv nqa tawm no, yog cov tsos ntawm loj curing toj siab. Kom ntau ntau cov NAC tsub kom thiaj ruaj khov ceev. Qhov zoo tshaj ntawm cov roj hmab twb soj ntsuam los ntawm xam qhovkev yam ntxwv ntawm curatives.

zog

Properties NBR acrylonitrile cov ntsiab lus txiav txim. Qhov no yam roj hmab yog heev soluble nyob rau hauv ketones, ib co hydrocarbon kev daws teeb meem thiab esters. Aliphatic hydrocarbons thiab haus dej haus cawv yuav luag tsis ntxim rau cov xaus ntawm lub NBR. Qhov nce nyob rau hauv muaj pes tsawg leeg txhawb intermolecular acrylonitrile khoom raug ntawm lub polymer chains: tus loj dua cov NAC nyob rau hauv nyob tus yeees ntawm cov khoom, ntau dua qhov lub ceev thiab tsub kom lub iav hloov kub hom. Kom ntau ntau cov NAC thiaj li dielectric zog thiab thiaj li cov neeg kawm ntawv ntawm solubility nyob rau hauv uas muaj ntxhiab kuab tshuaj thiab tsub kom cov kuj mus o nyob rau hauv aliphatic hydrocarbons.

Nyob rau hauv chav kawm ntawm polymerization ntawm roj hmab, nws yuav ua tau ntau yam plastoelasticheskimi ntsuas. Lawv yuav ua tau:

• Heev zog (hardness ntawm Defoe 21,5 - 27,5 N). tsab ntawv "T" no ntxiv thaum labeling xws roj hmab los nws lub npe.
• Khoom (txhav Defoe 17.5 - 21,5 N).
• Mos (txhav Defoe 7.5 - 11.5 N). tsab ntawv "M" yog ntxiv thaum labeling xws roj hmab los nws lub npe.

Rau NBR, tsim nrog kev koom tes los ntawm sulfonates li emulsifiers, labeling ntxiv tsab ntawv "C". Piv txwv li, SKN-26MS - ib tug mos mos roj hmab nyob rau hauv uas 26% ntawm txhua yam tam sim no NAC thiab npaj tau siv biodegradable alkylsulfonate emulsifier.