Ingaba indawo yokunyibilika ephezulu ivuthelwa njani imathiriyeli yePP?

Kutshanje, izixhobo zemaski zifumene ingqwalasela enkulu, kwaye abasebenzi bethu bepolymer abathintelwanga kweli dabi lokulwa nobhubhane. Namhlanje siza kwazisa indlela izinto zePP ezinyibilikayo eziveliswa ngayo.

Imfuno yemarike yendawo ephezulu yokunyibilika kwePP

Ukunyibilika kokunyibilika kwepolypropylene kuhambelana ngokusondeleyo nobunzima bayo bemolekyuli. Ubunzima bobunzima bemolekyuli ye-polypropylene resin yorhwebo elungiselelwe yinkqubo ye-catalytic ye-Ziegler Natta ngokuqhelekileyo phakathi kwe-3 × 105 kunye ne-7 × 105. Isalathisi sokunyibilika kwezi ntlambo eziqhelekileyo ze-polypropylene ziphantsi ngokubanzi, ezithintela uluhlu lwabo lwesicelo.

Ngophuhliso olukhawulezayo loshishino lwefayibha yeekhemikhali kunye neshishini loomatshini belaphu, ishishini lelaphu elingalukwanga linyuke ngokukhawuleza. Uluhlu lweenzuzo zepolypropylene zenza ukuba ibe yinto ekhethiweyo ekrwada kwiilaphu ezingalukwanga. Ngophuhliso loluntu, imimandla yokusetyenziswa kweendwangu ezingalukwanga zivame ukuba zibanzi: kwintsimi yezonyango kunye nempilo,amalaphu angalukwangaingasetyenziselwa ukwenza iingubo zodwa, iimaski, iingubo zotyando, i-napkins yabasetyhini, i-diapers yabantwana, njalo njalo; Njengesakhiwo kunye nezixhobo ze-geotechnical, amalaphu angalukwanga angasetyenziselwa ukuvalela amanzi eluphahleni, ukwakhiwa kweendlela, kunye neeprojekthi zogcino lwamanzi, okanye uphahla oluphezulu oluvakalisiweyo lunokuveliswa kusetyenziswa i-spunbond kunye nenaliti ehlatyiweyo yetekhnoloji ehlanganisiweyo. Ubomi bayo benkonzo ngamaxesha angama-5-10 ubude kune-asphalt yendabuko evakalelwa; Izinto zokucoca zikwayenye yezona mveliso ziphuhlayo ngokukhawuleza kumalaphu angalukwanga, angasetyenziselwa ukuhluza igesi kunye nolwelo kumashishini afana neekhemikhali, amayeza, kunye nokutya, kwaye anamandla amakhulu entengiso; Ukongeza, amalaphu angalukwanga angasetyenziselwa ukwenziwa kwesikhumba sokwenziwa, iingxowa, iilaphu zempahla, amalaphu okuhombisa, amalaphu okusula kubomi bemihla ngemihla kunye nokusetyenziswa kwendlu.

Ngenxa yophuhliso oluqhubekayo lwamalaphu angalukwanga, iimfuno zemveliso kunye nokusetyenziswa kwazo zihlala zisanda, ezifana nokunyibilika, ukuveliswa kwesantya esiphezulu, kunye neemveliso ezincinci. Ke ngoko, iimfuno zokusetyenzwa kweresin yepolypropylene, eyona mpahla iphambili yelaphu elingalukwanga, iye yanda ngokuhambelanayo; Ukongeza, ukuveliswa kwe-speed-speed spinning okanye i-fine denier polypropylene fibers nayo ifuna i-polypropylene resin ukuba ibe neepropati ezintle zokunyibilika; Ezinye ii-pigments ezingakwaziyo ukumelana nobushushu obuphezulu zifuna ukucutshungulwa kwe-polypropylene njenge-carrier kumaqondo aphantsi kakhulu. Zonke ezi zifuna ukusetyenziswa kwe-ultra-high melt index polypropylene resin njengento eluhlaza enokuthi iqhutywe kumaqondo aphantsi.

Izinto ezikhethekileyo zeendwangu ezinyibilikayo ziphezulu ze-melt index polypropylene. Isalathisi sokunyibilika sibhekisa kubunzima bezinto ezinyibilikisiweyo ezidlula kwi-standard die capillary rhoqo ngemizuzu eli-10. Ixabiso elikhulu, ngcono ukusetyenzwa kwe-fluidity yezinto. Okukhona siphezulu isalathiso sokunyibilika kwepolypropylene, kokukhona imicu evuthelweyo icolekileyo, kwaye kokukhona ukusebenza ngcono kohluzo lwelaphu eliveliswe linyibilika elivuthelweyo.

Indlela yokulungiselela isalathisi esiphezulu se-polypropylene resin

Enye kukulawula ubunzima bemolekyuli kunye nokusabalalisa ubunzima bemolekyuli yepolypropylene ngokulawula inkqubo yokuphendula i-polymerization, njengokusebenzisa iindlela zokunyusa ukuxinana kwee-inhibitors ezifana ne-hydrogen ukunciphisa ubunzima bemolekyuli yepolymer, ngaloo ndlela ukwandisa isalathisi sokunyibilika. Le ndlela inqunyelwe yizinto ezifana nenkqubo ye-catalytic kunye neemeko zokusabela, okwenza kube nzima ukulawula ukuzinza kwesalathisi sokunyibilika kunye nokuphunyezwa.

IYanshan Petrochemical ibisebenzisa izixhobo zemetallocene ukwenza upholiso oluthe ngqo lwemathiriyeli enyibilikayo enesalathisi esinyibilikayo esingaphezu kwe-1000 kule minyaka imbalwa idlulileyo. Ngenxa yobunzima bokulawula ukuzinza, i-polymerization enkulu ayizange iqhutywe. Ukusukela oko kwaqhambuka ubhubhane kulo nyaka, iYanshan Petrochemical yamkele ukuthotywa okulawulekayo kwe-polypropylene melt blown itekhnoloji yokuvelisa izinto eziphuhliswe ngo-2010 ukuvelisa i-polypropylene enyibilikayo evuthelweyo yelaphu elingalukiweyo imathiriyeli ekhethekileyo nge-12 kaFebruwari. Ngelo xesha, iimvavanyo zamashishini zenziwa kwisixhobo kusetyenziswa i-metallocene catalysts. Imveliso iye yaveliswa kwaye ngoku ithunyelwa kubasebenzisi abasezantsi ukuze bavavanywe.

Enye indlela kukulawula ukuthotywa kwepolypropylene efunyenwe ngepolymerization eqhelekileyo, ukunciphisa ubunzima bayo bemolekyuli kunye nokwandisa isalathisi sayo sokunyibilika.

Ngaphambili, iindlela zokunciphisa ubushushu obuphezulu zazisetyenziswa ngokuqhelekileyo ukunciphisa ubunzima bemolekyuli yepolypropylene, kodwa le ndlela yokutshatyalaliswa komatshini wokushisa ophezulu inemiqobo emininzi, njengokulahleka kwezongezo, ukuchithwa kwe-thermal, kunye neenkqubo ezingazinzanga. Ukongezelela, kukho iindlela ezifana nokuchithwa kwe-ultrasonic, kodwa ezi ndlela zihlala zifuna ubukho be-solvents, okwandisa ubunzima kunye neendleko zenkqubo. Kwiminyaka yakutshanje, indlela yokuchithwa kweekhemikhali ye-polypropylene ngokuthe ngcembe isetyenziswe ngokubanzi.

Ukuveliswa kwesalathisi esiphezulu se-PP ngendlela yokutshatyalaliswa kweekhemikhali

Indlela yokuthotywa kweekhemikhali ibandakanya ukusabela kwe-polypropylene kunye nee-agent zokutshatyalaliswa kweekhemikhali ezifana ne-peroxides ye-organic kwi-screw extruder, ebangela ukuba i-molecular chain of polypropylene iphuke kwaye inciphise ubunzima bayo be-molecular. Xa kuthelekiswa nezinye iindlela zokuthotywa, ineengenelo zokuthotywa ngokupheleleyo, ukunyibilika okulungileyo kokunyibilika, kunye nenkqubo elula nenokwenzeka yokulungiselela, nto leyo eyenza kube lula ukwenza imveliso yemizi-mveliso emikhulu. Le yeyona ndlela isetyenziswa ngokuqhelekileyo ngabavelisi beplastiki abalungisiweyo.

Iimfuno zezixhobo

Indawo yokunyibilika ephezulu ibhekisa kwisixhobo esahluke ngokupheleleyo kwisixhobo esiqhelekileyo sokuguqula iPP. Izixhobo ezisetyenziselwa ukutshiza izinto ezityhidiweyo zifuna umlinganiselo omde kunye nentloko yomatshini othe nkqo, okanye zisebenzisa igranulation engaphantsi kwamanzi (i-Wuxi Huachen inomlinganiselo ofanayo ongaphantsi kwamanzi); Izinto eziphathekayo zincinci kwaye zifuna ukudibana namanzi ngokukhawuleza emva kokuphuma kwintloko yomatshini ukupholisa lula;

Ukuveliswa kwepolypropylene eqhelekileyo kufuna isantya sokusika i-extruder yeemitha ezingama-70 ngomzuzu, ngelixa i-polypropylene ephezulu yokunyibilika idinga isantya sokusika esingaphezu kweemitha ezili-120 ngomzuzu. Ukongezelela, ngenxa yesantya sokuhamba ngokukhawuleza kwe-polypropylene ephezulu yokunyibilika, umgama wokupholisa nawo kufuneka unyuswe ukusuka kwiimitha ezi-4 ukuya kwi-12 yeemitha.

Umatshini wokwenza izinto ezinyibilikayo ezinyibilikayo ufuna i-mesh eqhubekayo yokutshintsha, ngokuqhelekileyo usebenzisa umtshini we-mesh station ezimbini. Imfuno yamandla emoto iphezulu kakhulu, kwaye iibhloko zokucheba ezingaphezulu zisetyenziswa kumalungu esikrufu;

1: Ukuqinisekisa ukutya okugudileyo kwezinto ezifana nePP kunye neDCP;

I-2: Qinisekisa umlinganiselo ofanelekileyo we-aspect ratio kunye ne-axial position yokuvula ngokusekelwe kwisiqingatha sobomi befomyula edibeneyo (eye yavela kwisizukulwana sesithathu ukuqinisekisa ukugqithiswa kakuhle kwe-CR-PP reaction);

I-3: Ukuqinisekisa isivuno esiphezulu seminwe enyibilikisiweyo ngaphakathi koluhlu lokunyamezela (ngaphezu kwe-30 imicu egqityiweyo inexabiso eliphezulu eliphezulu kunye nesiseko sokuxuba xa kuthelekiswa nemicu yeshumi elinesibini kuphela);

4: Iintloko zokungunda ezikhethekileyo phantsi kwamanzi kufuneka zixhotyiswe. Ukunyibilika kunye nokushisa kufuneka kuhanjiswe ngokulinganayo, kwaye inani lenkunkuma kufuneka libe lincinci;

I-5: Kunconywa ukuxhobisa i-granulator epholileyo ekhulileyo yezinto ezincibilikayo (ezinegama elihle kwishishini) ukuqinisekisa umgangatho weegranules ezigqityiweyo kunye nezinga eliphezulu lesivuno;

6: Ukuba kukho ingxelo yokukhangela kwi-intanethi, kuya kuba ngcono.

Ukongeza, umqalisi wokuthomalalisa owongeziweyo kwifidi esecaleni enolwelo ufuna ukuchaneka okuphezulu ngenxa yomlinganiselo omncinci wokongezwa. Kwizixhobo zokutya ezisecaleni ezifana neBrabenda ethunyelwa ngaphandle, iKubota, kunye neMatsunaga eveliswa ekhaya.

Isixhobo sokuthotywa kwesidima esisetyenziswayo ngoku

1: I-Di-t-butyl peroxide, ekwaziwa ngokuba yi-di tert butyl peroxide, initiator a and vulcanizing agent dTBP, lulwelo olungenambala ukuya kumthubi kancinane olubonakeleyo olunganyibilikiyo emanzini kwaye luxubene nezinyibilikisi zendalo ezifana ne-benzene, toluene, kunye ne-acetone. I-oxidizing kakhulu, inokutsha, izinzile kwiqondo lobushushu begumbi, ayinamvakalelo kwimpembelelo.

I-2: I-DBPH, efinyeziweyo njenge-2,5-dimethyl-2,5-bis (tert butylperoxy) i-hexane, inobunzima be-molecular 290.44. Ulwelo olumthubi olukhanyayo, intlama efana nobisi olumhlophe, kunye noxinzelelo oluyi-0.8650. Indawo yokukhenkceza 8 ℃. Indawo yokubilisa: 50-52 ℃ (13Pa). Isalathiso se-refractive 1.418 ~ 1.419. I-viscosity yolwelo yi-6.5 mPa. s. Indawo edanyazayo (indebe evulekileyo) 58 ℃. Inyibilika kuninzi lwezinyibilikisi zendalo ezifana neealkoholi, ii-ethers, iiketones, iiesters, kunye neehydrocarbons ezinevumba elimnandi, ezinganyibilikiyo emanzini.

3: Uvavanyo lokunyibilika kweminwe

Uvavanyo lwe-melt finger kufuneka luqhutywe ngokuhambelana ne-GB / T 30923-2014 Polypropylene Melt Spray Izinto ezikhethekileyo; Abavavanyi abaqhelekileyo beminwe yenyibilika abanakuvavanywa. Indawo yokunyibilika ephezulu ibhekisa kusetyenziso lwendlela yomthamo kunendlela yobunzima bovavanyo.

Dongguan Liansheng Non woven Technology Co., Ltd.yasekwa ngoMeyi 2020. Lishishini elikhulu lemveliso yelaphu elingalukiweyo elidibanisa uphando nophuhliso, imveliso, kunye neentengiso. Inokuvelisa imibala eyahlukeneyo ye-PP spunbond amalaphu angalukwanga kunye nobubanzi obungaphantsi kwe-3.2 yeemitha ukusuka kwi-9 grams ukuya kwi-300 grams.