Polyurethane Cob: Ob-tivthaiv Thiab Hydroactive Txhaj Tshuaj Rau Txoj Kab Nrum, Muaj Pes Tsawg Leeg Thiab Daim Ntawv Thov

2024 Tus sau: Beatrice Philips | [email protected]. Kawg hloov kho: 2023-12-16 05:41

Polyurethanes yog tsev neeg ntawm cov polymers uas tau tsim los ntawm kev txuas cov saw yooj yim, rov ua dua cov lwg me me. Ib tus neeg sawv cev ntawm chav kawm yog polyurethane cob.

Nws yog dab tsi?

Polyurethane cob yog cov khoom siv hluavtaws tsim hluavtaws. Nws yog cov khoom lag luam siv hauv kev tsim cov roj hmab, tshuaj thiab lwm yam.

Txhawm rau nkag siab zoo tias nws yog dab tsi, koj yuav tsum paub kev sib txuas.

Isocyanate yog cov khoom sib xyaw ua los ntawm nitrogen, carbon thiab oxygen . Thaum nws raug rau hydroxyl, cov khoom sib xyaw uas muaj hydrogen, urethane daim ntawv cog lus tau tsim. Diisocyanate yog cov khoom sib xyaw uas muaj ob isocyanates, yog li lawv kuj ua haujlwm nrog hydrogen.

Polyols feem ntau yog cawv uas muaj ntau dua ib qho hydrogen atom.

Kev tsim cov tshuaj polyurethane feem ntau cuam tshuam nrog cov tshuaj tiv thaiv ntawm polyether polyol thiab diisocyanate xws li toluene diisocyanate.

Cov cua sov lossis catalysts kuj tseem xav tau kom ua tiav cov txheej txheem, thiab thaum lawv ntxiv, cov khoom siv rau nws daim ntawv kawg thiab hloov tsis tau . Qhov no txhais tau tias nws tsis tuaj yeem hloov pauv txawm tias raug cua sov dua.

Polyurethane cob tau suav tias yog ntau yam vim tias nws tuaj yeem siv los ua ntau yam khoom lag luam, los ntawm cov inks mus rau yas. Qhov no dhau los ua tau, txij li cov khoom tuaj yeem hloov pauv nws cov khoom hauv kev xaiv sib txawv.

Nws tau tsim tawm hauv cov kua ua kua, tab sis tuaj yeem nchuav rau hauv pwm. Cov tshuaj muaj qhov ua haujlwm tsis zoo rau cov roj, tshuaj lom neeg, thiab muaj kev ua haujlwm zoo.

Lwm cov txiaj ntsig suav nrog:

• tshuaj tiv thaiv zoo heev, tshwj xeeb rau ib puag ncig alkaline;
• siab heev tensile, compressive thiab flexural zog;
• qis qis thaum lub sij hawm tawv;
• cov khoom siv hluav taws xob zoo heev;
• zoo heev corrosion kuj;
• qib siab ntawm kev tiv thaiv lub cev kev nyuaj siab;
• muaj peev xwm ua kom tawv nyob rau ntau qhov kub thiab txias.

Tsis zoo:

• qhov cuam tshuam ntawm hluav taws xob ultraviolet tau cuam tshuam tsis zoo;
• tsis tuaj yeem siv nrog cov kuab tshuaj organic.

Saib

Polyurethane cob tuaj yeem yog ob qho khoom siv thiab ib qho. Yog tias peb tham txog cov khoom lag luam hauv khw, tom qab ntawd muaj epoxy thiab hydroactive txhaj. Cov muaj pes tsawg leeg ntawm txhua hom sib txawv, yog li ntawd qhov kev thov siv kuj txawv.

Prepolymers yog lub hauv paus rau kev tsim cov tshuaj ib leeg.

Ntawm lawv qhov tshwj xeeb:

• nce ntim thaum sib cuam tshuam nrog kua;
• qis viscosity.

Txhawm rau ua haujlwm nrog cov cob, koj tsis tas yuav yuav cov cuab yeej ntxiv thiab sib xyaw cov khoom sib xyaw. Cov tshuaj tiv thaiv kab mob siab.

Cov khoom ntim txawm tias qhov me me tawg sai thiab yooj yim . Cov tshuaj tau pom dav siv hauv thaj tsam ntawm kev lim dej.

Hydroactive polyurethane yog lub hauv paus siv los tsim cov khoom ib leeg. Sib txawv nyob rau lub sijhawm luv ntawm ua npuas ncauj.

Nws yog qhov zoo tshaj rau kev kho cov dej xau. Thaum sib cuag nrog cov kua, cov khoom nce hauv ntim 40 zaug . Cov cob tau muab tso nrog cov cuab yeej tshwj xeeb - lub twj tso kua mis. Qhov tseeb vim tias nws muaj viscosity qis, txawm tias microcracks tau sau.

Yog tias koj xav tsim lub kaw ntom ntom ntom ntom ntom ntom ntom ntom, tom qab ntawd koj yuav tsum siv cov khoom sib xyaw ib qho.

Yog tias qhov dej xau tau tsim nrog cov dej ntws nquag, tom qab ntawd ob qhov sib xyaw ua ke tau zoo.

Kev sib raug zoo yog tsim nrog cov khoom siv xws li pob zeb ua vaj, cib, pob zeb ntuj . Nrog kev pab los ntawm kev muaj pes tsawg leeg, kev tsim vaj tsev kuj tseem muaj kev sib txuas thaum tsim qhov av los yog kev ua haujlwm drilling tseem tab tom ua. Cov yas tuaj yeem siv tau ntawm qhov kub ntawm -10 txog + 45 C.

Epoxies yog thermosetting polymer resins uas cov molecule muaj ib lossis ntau pawg epoxy. Muaj ob hom tseem ceeb ntawm epoxy resins: glycidyl thiab non-glycidyl.

Glycidyl: glycidylamine, glycidyl ether . Cov tsis-glycidyl epoxy resins yog aliphatic lossis cyclo-aliphatic resins.

Ib qho ntawm cov glycidyl epoxy resins feem ntau yog tsim los siv bisphenol A (BPA) thiab ua ke los ntawm cov tshuaj tiv thaiv nrog epichlorohydrin. Lwm hom nquag siv yog hu ua novolac raws epoxy.

Cov ntawv thov

Resins tau siv ntau dua li tsuas yog sau cov kab. Qee hom khoom lag luam tau paub rau peb:

• cov hlab ntsha siab;
• kav dej;
• lub cev ntaj ntsug;
• khoom siv ua si;
• pas nrig insulator;
• boom ncej;
• qhov chaw dav hlau;
• skis thiab snowboards;
• luam tawm Circuit Board;
• tsheb kauj vab ncej;
• hockey stick.

Tau kawg, ib qho ntawm thaj chaw tseem ceeb uas siv polyurethane cob yog siv rau hauv kev tsim kho thiab kho dua tshiab.

Nrog kev pab los ntawm cov khoom siv, kev kho dua tshiab ntawm cov tsev nyob hauv av tau ua tiav.

Cov voids hauv lub hauv paus tuaj yeem tshem tawm tau yooj yim nrog cov cuab yeej no. Tsis tas li ntawd, nws yog qhov tshwj xeeb thiab cov khoom siv tiv thaiv dej tsis zoo.

Nws kuj tseem tsim nyog sau cia tias polyurethane yog cov khoom yas uas muaj nyob hauv ntau hom ntawv:

• rwb thaiv tsev ntawm cov tub yees thiab lub tub yees;
• rwb thaiv tsev ntawm cov tsev;
• tsheb qhov chaw;
• nplaum;
• cov menyuam thiab cov log tsheb;
• ntoo vaj huam sib luag;
• khau ib leeg.

Yog tias peb tham tshwj xeeb txog cov txheej txheej uas tau ua los ntawm cov yas polyurethane, tom qab ntawd lawv txhua tus muaj kev tiv taus siab thiab muaj zog. Tsis tas li ntawd, lawv tau qhuas rau lawv cov nplaum zoo, tawv thiab ua kom zoo.

Nws yog tus neeg sawv cev tiv thaiv dej tsis zoo uas tsis cuam tshuam los ntawm cov kuab tshuaj thiab roj . Cov kab mob me me tsis cuam tshuam rau polyurethane resins.

Cov kab nrib pleb uas muaj pes tsawg leeg tau pub los ntawm kev txhaj tshuaj hoses tau ua tiav. Hauv txoj kev no, koj tuaj yeem ua qhov rov tsim kho lub hauv paus.