Vim Li Cas Cov Kev Tsis Zoo No Thiaj Rov Qab Los Hauv Kev Tsim Khoom

Hauv cov txheej txheem polyurethane casting thiab molding,cov qhov me me, cov qhov ntsws me me, thiab cov cim ntwsyog cov teeb meem ntawm qhov chaw uas rov tshwm sim ntau tshaj plaws hauv ob qho tib si polyurethane uas yoog tau thiab tawv.

Txawm tias tom qab hloov kho ntau zaus, cov teeb meem no feem ntau rov tshwm sim, qhia tias qhov ua rau tsis tshua muaj qhov yuam kev ua haujlwm. Hloov chaw, lawv yog los ntawm ib qhokev tsis sib npaug ntawm theem systemuas muaj xws li:

• Kev tswj cov dej noo ntawm cov khoom siv raw
• Kev sib xyaw ua ke ntawm cov tshuaj tiv thaiv (kev ua npuas dej vs kev sib npaug ntawm cov gelation)
• Kev ntsuas thiab kev sib tov ruaj khov
• Kev tsim cov pa tawm thiab kev sau pwm
• Kev tswj qhov kub thiab txias

Rau kev tsim khoom ruaj khov, ib qho tsim kom zoopolyurethane formulation systemyog qhov tseem ceeb.

Kawm ntxiv txog cov txheej txheem zoo tshaj plaws rau ntau daim ntawv thov sib txawv:
Cov Kev daws teeb meem ntawm Polyurethane System

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1. Cov Qhov Me Me (Cov Qhov Me Me, Cov Qhov Me Me, Cov Qhov Los Ntawm)

1.1 Cov hauv paus ua rau rov tshwm sim dua

(1) Kev Ua Phem Los Ntawm Dej - Qhov Ua Rau Tseem Ceeb

Cov dej noo hauv polyols, catalysts, silicone surfactants, lossis additives yog qhov ua rau muaj qhov pinholes feem ntau.

Cov peev txheej tseem ceeb suav nrog:

• Cov khoom siv raw hygroscopic nqus
• Kev sib sau ua ke hauv cov thoob dej cia khoom
• Kev hydrolysis ntawm isocyanate
• Cov pwm ntub dej los yog cov tshuaj tso tawm uas muaj dej
• Cov av noo siab heev

Dej ua rau isocyanate (NCO) ua rau muaj CO₂ roj. Yog tias cov npuas dej tsis tuaj yeem tawm ua ntej ua kom gelation,cov qhov pinholes raug xauv mus tas li rau hauv qhov qauv.

Cov tshuaj uas rhiab rau dej yuav tsum tau tsim qauv zoo tshaj plaws:
Lub Tsev Polyurethane System

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(2) Huab Cua Nkag Thaum Lub Sijhawm Sib Tov

• Kev sib xyaw ceev dhau heev
• Qhov siab poob thaum lub sijhawm nchuav
• Kev tsim lub taub hau sib xyaw ua kom tsis muaj zog

Cov xwm txheej no ua rau muaj cov npuas me me uas tsis tuaj yeem khiav tawm raws sijhawm.

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(3) Kev Ua Npuas Ncauj-Gelation Tsis Sib Npaug

• Cov gelation sai dhau → cov npuas daig rau hauv phab ntsa khov kho
• Ua npuas sai dhau → npuas tawg
• Kev sib raug zoo ntawm cov tshuaj silicone surfactant tsis zoo → Cov qauv cell tsis ruaj khov

Kev xaiv cov tshuaj catalyst ua lub luag haujlwm tseem ceeb hauv kev sib npaug ntawm qhov ceev ntawm cov tshuaj tiv thaiv:
Cov tshuaj polyurethane amine catalysts

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(4) Cov Qhov Tsis Zoo ntawm Qhov Pa Tawm ntawm Pwm

• Cov qhov cua uas raug thaiv
• Kev tsim qhov cua tsis zoo
• Kev kaw pwm ua ntej lub sijhawm ua rau huab cua ntes tau

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1.2 Kev daws teeb meem engineering

• Txhim kho cov khoom siv raw khoom kaw thiab kev saib xyuas dej noo
• Siv cov kev tiv thaiv nitrogen hauv cov chaw noo noo
• Ua kom cov pwm sov thiab qhuav kom zoo
• Txhim kho lub zog sib tov thiab txo qhov cua nkag
• Kho qhov sib npaug ntawm amine/tin catalyst rau lub sijhawm teb ruaj khov
• Txhim kho qhov tsim qhov cua thiab qhov kaw pwm

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2. Cov Qhov Me Me (Cov Cim Qhov Dej, Qhov Nto Nto, Qhov Ntug Ntsug)

2.1 Cov hauv paus ua rau rov tshwm sim dua

(1) Tom Qab Ntsws Ntau Dhau

• Qhov ceev ntawm qhov sib txuas qis
• Cov NCO qis
• Qhov piv ntawm kev nthuav dav ua npuas ncauj siab

Ua rau sab hauv contraction tom qab txias thiab nto vau.

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(2) Kev Kho Tsis Sib Xws thiab Kev Faib Kub

• Cov ntu tuab kho qeeb dua li cov ntu nyias
• Qhov sib txawv ntawm kev ntxhov siab hauv zos
• Kev tsis sib xws ntawm qhov ntom ntawm cov khoom

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(3) Tsis txaus sau lossis tsim lub rooj vag tsis zoo

• Cov qhov tsis puv
• Kev ntws tsis zoo hauv thaj chaw kawg
• Qhov chaw txhaj tshuaj tsis raug

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(4) Kev rhuav tshem ua ntej lub sijhawm

Kev rhuav tshem thaum ntxov ua rau cov qauv puas tsuaj vim yog kev kho sab hauv tsis tiav.

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2.2 Kev daws teeb meem engineering

• Nce me ntsisNCO index (1.05 → 1.10 range)
• Ua kom qhov hnyav ntawm lub pob zoo dua thiab xyuas kom meej tias muaj dej ntau dhau
• Sib npaug qhov kub ntawm pwm thiab qhov kub ntawm cov khoom
• Ntev lub sijhawm kho ua ntej demolding
• Txhim kho qhov sib npaug ntawm cov mis siv kev ua kom zoo dua ntawm theem system

Kev txhawb nqa kev txhim kho qhov system:
Cov Kev daws teeb meem ntawm Polyurethane System

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3. Cov Cim Ntws (Cov Kab Ntws, Cov Kab Weld, Cov Kab Streaks, Cov Nto Nto)

3.1 Cov hauv paus ua rau rov tshwm sim dua

(1) Kev Nqus Dej Tsis Ruaj Khov

• Kev hloov pauv ntawm lub twj tso kua mis
• Kev tsis ruaj khov ntawm qhov ntsuas piv
• Kev txhaj tshuaj tsis sib haum

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(2) Qhov Kub Tsis Sib Xws

• Qhov kub ntawm pwm qis ua rau tawv nqaij ntxov ntxov
• Kev sib xyaw tsis zoo ntawm cov dej ntws
• Kev hloov pauv ntawm qhov kub thiab txias ua rau muaj qhov tsis sib xws

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(3) Tsim Rooj Vag Tsis Zoo

• Ib lub rooj vag nrog txoj kev ntws ntev
• Ntau qhov ntws ua rau cov kab vuam
• Kev ntws dej vim yog qhov loj ntawm lub rooj vag me me

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(4) Cov Teeb Meem Txog Kev Nqus Dej Tsis Zoo / Cov Neeg Ua Haujlwm Tso Tawm

• Kev ua kom cov mis tsis muaj zog
• Cov tshuaj pleev xim tsis sib npaug
• Kev sib xyaw ua ke ntawm cov av uas ua rau muaj kuab paug

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3.2 Kev daws teeb meem engineering

• Ua kom lub tshuab ntsuas thiab twj tso kua dej ruaj khov
• Tswj kom pwm thiab cov khoom kub sib xws
• Ntxiv cov ntsiab lus txhaj tshuaj rau cov qhov ntev
• Txhim kho qhov flowability siv kev hloov kho formulation

Txhim kho kev ua haujlwm ntawm lub cev nrog cov khoom ntxiv kom zoo:
Cov Tshuaj Tiv Thaiv Hluav Taws Kub & Cov Tshuaj Ntxiv

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4. Kev daws teeb meem raws li txoj cai

Thaum muaj qhov tsis zoo tshwm sim ntau zaus, siv txoj kev kuaj mob uas muaj cov qauv no:

Kauj Ruam 1: Kev Tswj Xyuas Ib Puag Ncig

• Kev ruaj khov ntawm qhov kub thiab av noo
• Cov dej noo ntawm cov khoom siv raw
• Cov xwm txheej ntawm kev kaw cia khoom

Kauj Ruam 2: Kev Tshawb Xyuas Lub Tshuab Ntsuas

• Kev sib xws ntawm A/B piv
• Kev ruaj khov ntawm lub twj tso kua mis
• Kev hloov pauv ntawm tus nqi ntws

Kauj Ruam 3: Kev Tshawb Xyuas Lub Tshuab Tshuaj Xyuas

• Qhov sib npaug ntawm cov khoom siv thiab pwm kub
• Kev xaiv lub kaw lus catalyst
• Lub sijhawm ua npuas ncauj piv rau lub sijhawm gelation

Kauj Ruam 4: Kev Tshawb Xyuas Lub Tshuab Pwm

• Tsim qhov cua
• Kev teeb tsa rooj vag
• Kev sib npaug ntawm tus neeg sawv cev tso tawm
• Lub sijhawm rhuav tshem

Kauj Ruam 5: Kev Ua Haujlwm Sib Xws

• Kev sib xyaw ua ke
• Kev tswj hwm cov txheej txheem nchuav
• Qhov tseeb ntawm qhov hnyav ntawm kev txhaj tshuaj

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Xaus lus

Cov qhov me me, cov qhov ntsws me me, thiab cov cim ntws tsis yog cov qhov tsis zoo uas cais tawm - lawv yogCov tsos mob ntawm qhov tsis sib npaug ntawm lub kaw lus thoob plaws kev tsim qauv, txheej txheem, thiab kev tsim pwm.

Kev tsim cov polyurethane ruaj khov yuav tsum tau tswj hwm ua ke ntawm:

• Cov khoom siv raw zoo
• Kev sib xyaw ua ke ntawm cov tshuaj tiv thaiv
• Kev siv tshuaj catalytic
• Kev tsim pwm
• Kev qhuab qhia txog cov txheej txheem

Rau kev ua tau zoo tas li thiab txo cov kev ua yuam kev, ib qho tsim kom zookev daws teeb meem polyurethaneyog qhov tseem ceeb.

Tiv tauj peb pab neeg txog kev tsim cov tshuaj kom haum rau koj tus kheej, xaiv cov tshuaj catalyst, thiab kev txhawb nqa lub kaw lus:

Lub Tsev Polyurethane System