Ii. Cov ntsiab cai synthesis ntawm daim txhuam cev
Thaum lub sij hawm synthesis cov txheej txheem ntawm cov txhuam cev, muaj ntau txoj saw kev loj hlob kev sib txawv, uas cuam tshuam nrog cov qauv molecular, qhov hnyav, thiab hnyav molecular hnyav ntawm cov khoom siv raw.
2.1 Saw Txuas Ntxiv
Cov saw txuas txuas cov tshuaj tiv thaiv ntawm isocyanate thiab di -}}} Ua haujlwm Polyol tshwm sim. Vim yog qhov dhau ntawm isocyanate los ntawm kwv yees li 5%, cov khoom kawg ntawm cov saw txuas txuas tau yog Isocyanate pawg. Cov txheej txheem rov ua dua no txhawb nqa kev loj hlob sai ntawm txoj saw hlau.
2.2 Ua npuas ncauj tiv thaiv nrog cov saw kev loj hlob
Thaum lub sij hawm tau tsim cov txhuam cev, cov foaming roj feem ntau yog los ntawm cov tshuaj tiv thaiv ntawm TDI nrog dej, uas tsim cov nyiaj ntau ntawm CO2 roj. Nyob rau tib lub sijhawm, cov amine tsim kho tshiab nrog isocyanate los ua urea txoj cai sib txuas. Cov txheej txheem rov qab no yog nrog cov saw kev loj hlob.
2.3 crosslinking cov tshuaj tiv thaiv
Cov kev hla hla yog qhov tseem ceeb rau kev npaj ntawm daim txhuam cev. Yog tias nws tshwm sim ntxov dhau los yog lig dhau lawm, nws yuav ua rau poob qis hauv qhov zoo ntawm daim txhuam cev lossis txawm tias nws rhuav tshem.
2.3.1 crosslinking ntawm polyfunctional tebchaw
Cov kev tawm tsam ntawm polyether polyols thiab isocyanates ncaj qha cuam tshuam rau ntom ntawm daim txhuam cev. Qhov hnyav molecular ntawm cov ntsiab lus hla kev yog 2000-20000. Tus me dua cov molecular hnyav, ntau dua cov crosslinking ntom, thiab siab dua lub hardness ntawm foam, thaum lub mos mos thiab elasticity yuav poob qis.
2.3.2 Diurea Crosslinking
Dej reacts nrog isocyanates los tsim urea cov nyiaj sib txuas, uas ntxiv tau nrog etocyanates los ua peb lub}} txoj cai qauv Diureains Crosslinking tebchaw.
2.3.3 ureafinate crosslinking
Cov hydrogen ntawm cov nitrogen atom nyob rau hauv pab pawg aminoformate nrog isocyanates los ua ib tug peb {{} qhov chaw hla kev ntawm ureafhas.
III. Cov txheej txheem ntau lawm thiab ntws
Tam sim no, feem ntau ntawm cov txhuam cev ntau lawm adop for - theem box {}}} hom qauv ua npuas. Ntau cov ntaub ntawv tau sai ntxiv rau lub thawv tsim nyob rau hauv high}}} kev sib cav sib ceg, yog li ua tiav daim txhuam cev ntau lawm. Qhov zoo ntawm cov txheej txheem no yog cov txheej txheem luv luv, cov khoom siv me me, txuag kev txuag yooj yim, txuag hluav taws xob me me, thiab cov peev txheej dav hauv qhov chaw ntom ntom.
3.1 Txheej Txheem
Nws tau muab faib ua ob feem: tivthaiv A, Polyether Polyol, dej caticalyst, silicone roj, yog sib xyaw rau 20 vib nas this nyob rau hauv high- ceev nplawm. Cheebtsam B, TDI, nplaim taws retardant, organic tin, yog do 10 vib nas this. Cov khoom sib xyaw thiab cov khoom siv B yog sib xyaw thiab nplawm ntawm qhov kev kub ceev rau 10 vib nas this, tom qab ntawd tau nchuav sai sai rau hauv lub thawv. Cov pwm tuav lub sijhawm yog 6-8 vib nas this, thiab lub sijhawm ua npuas ncauj yog li 1 feeb. Tom qab kev laus rau 2 teev, nws tuaj yeem txiav mus rau qhov uas yuav tsum tau tom qab 24 teev. Daim Txhuam Cev Ntau Lawm Technology Txheej Txheem