Kev cuam tshuam ntawm ib puag ncig cov av noo ntawm PU foaming txheej txheem yog feem ntau cuam tshuam hauv npuas stability, cov tshuaj tiv thaiv tus nqi thiab cov khoom zoo. Cov kev cuam tshuam tshwj xeeb thiab cov lus teb yog raws li hauv qab no:
Cov teebmeem ntawm Environmental Humidity ntawm PU Foaming Process
1. Txo npuas stability
Nyob rau hauv ib puag ncig siab - av noo, noo noo nyob rau hauv cov huab cua nyob rau saum npoo ntawm cov khoom noj, ua rau cov pa gases los ntawm decomposition ntawm foaming agents reacts nrog noo noo los tsim carbon dioxide, tsim ua npuas ncauj. Cov npuas no feem ntau ua rau tawg lossis sib koom ua ke thaum kho, ua rau cov qauv ntawm tes tsis sib xws, npuas tawg lossis deg tsis zoo. Piv txwv li, yog tias tsis tswj cov av noo thaum lub caij ntuj sov tsim, koob qhov los yog lub hnab ntim cua tuaj yeem tshwm rau ntawm qhov chaw ntawm PU gaskets.
Cov tshuaj tiv thaiv txawv txav
2. Cov av noo ntau dhau: qhov sib ntxiv ntawm cov dej noo yuav ua rau kom lub decomposition ntawm tus neeg sawv cev tshuab, cov tshuaj tiv thaiv ntawm cov tshuab tshuab yog ceev heev, cov cell membrane phab ntsa coagulates ntxov dhau, nws yog ib qho nyuaj rau tsim pore qauv, txhim kho tus nqi kaw.
Tsawg av noo: Tsis muaj dej noo nyob rau hauv cov ntaub ntawv raw tuaj yeem ua rau tsis tiav decomposition ntawm foaming agents, txo cov roj ntau lawm, txo cell ceev, thiab txawm tias tsis txaus ntawm raw cov ntaub ntawv.
Khoom zoo deterioration
Cov av noo hloov pauv yuav cuam tshuam ncaj qha rau qhov ntom, elasticity thiab breathability ntawm PU npuas. Piv txwv li, polyurethane sponge ua nyob rau hauv siab - av noo ib puag ncig tej zaum yuav poob elasticity vim qhov chaw kaw, thaum nyob rau hauv qis - vaum ib puag ncig qhov ceev ntawm daim txhuam cev yuav tsis ua raws li tus qauv, cuam tshuam rau nws cov kev ua tau zoo.
3. Kev tiv thaiv
Tswj ambient humidity
Kev cob qhia ntau lawm: Ua kom cov av ruaj khov los ntawm 50% -60% los ntawm dehumidifiers lossis cua txias kom tsis txhob muaj av noo ntau tshaj 75% lossis qis dua 40%. Piv txwv li, thaum lub caij ntuj sov kev tsim kho, qhov rais thiab qhov rooj yuav tsum raug kaw kom tsis txhob muaj av noo ntau thaum hnub los nag. Nyob rau lub caij ntuj no, nws yuav tsum tau rhuab thiab dehumidified los tiv thaiv cov khoom raw los ntawm absorbing noo noo.
Cia cov ntaub ntawv raw: xyuas kom meej tias cov ntaub ntawv raw yog khaws cia rau hauv cov thawv airtight kom tsis txhob raug huab cua ntub. Cov dej noo ntawm cov khoom siv raw yuav tsum tau kuaj ua ntej siv. Yog tias siab tshaj tus qauv, nws yuav tsum tau qhuav.
Optimize txheej txheem tsis
Kho tus nqi ntawm tus neeg sawv cev foaming: nce lossis txo qhov feem ntawm tus neeg ua npuas dej raws li cov av noo. Txo tus nqi ntawm tus neeg sawv cev foaming thaum cov av noo siab thiab nce tus nqi ntawm tus neeg sawv cev foaming thaum cov av qis kom sib npaug ntawm cov roj ntau lawm.
4. Kev ua kom zoo ntawm kev sib xyaw ua ke ntawm catalyst: Qhib catalysts (xws li triethylenediamine derivatives) tau xaiv ua ke nrog cov pa catalysts ntawm qhov sib piv ntawm 1: 3-1: 5 los pab txhawb cell membrane phab ntsa tawg thiab txo cov cell kaw.
Tswj cov khoom siv kub: ua kom cov khoom siv raw kub ruaj khov ntawm 20-25 degree, tiv thaiv cov tshuaj tiv thaiv sai heev vim tias kub siab, lossis ua kom cov viscosity ntawm cov khoom siv raw vim qhov kub thiab txias, thiab do unevenly.
Kev txhim kho cov khoom siv thiab pwm tsim
Pwm tso zis optimization: tsim nyog lub qhov cua thiab qhov chaw nres nkoj tso rau hauv qhov tuag kom ntseeg tau tias cov pa paug du thiab tiv thaiv npuas rupture vim lub siab tsub zuj zuj. Piv txwv li, preheating pwm phim cov tshuaj tiv thaiv kub kom txo tau cov kev hloov hauv zos.
Do thiab ncuav tswj: Ua kom nrawm nrawm rau 2000-3000r / min thiab nplawm lub sij hawm mus rau 10-15 vib nas this kom ntseeg tau tias muaj kev sib xyaw ntawm cov khoom A thiab B. Tswj lub pouring ceev kom tsis txhob turbulence ua puas lub roj teeb qauv.
Kev tshaj tawm - txheej txheem ua tiav.
Mechanical perforation: For sponges with a high density of enclosed cells, acupuncture (50 to100 needles per square centimetre, 80 to 90 per cent of the thickness of the sponge) or rolling pressure (0.3 to0.5MPa, repeated 2-3 times) is used to facilitate cell connectivity.
Ntxuav thiab qhuav: Tom qab kho, ntxuav daim txhuam cev hauv dej sov ntawm 40-50℃kom tshem tawm cov khoom siv raw. Tom qab ntawd qhuav ntawm 80-100℃rau 2-3 teev kom ntseeg tau tias sab hauv lub roj teeb dries.