The key role of polyurethane catalysts in the production of spray foam insulation materials

Lub hauv paus ntsiab lus ntawm kev tsim cov khoom siv rwb thaiv tsev ua npuas dej

Cov Khoom Siv Ua Npuas Ncauj Tsuag (SPF) yog cov khoom siv rwb thaiv tsev kub uas ua los ntawm kev sib xyaw ob yam khoom tseem ceeb - polyol resin thiab isocyanate. Thaum ob yam khoom ua kua no sib xyaw ua ke hauv lub tshuab txau tshwj xeeb, cov tshuaj tiv thaiv sai sai tshwm sim hauv qab kev ua haujlwm ntawm cov catalyst, thiab cov pa roj carbon dioxide raug tso tawm tib lub sijhawm, ua rau cov khoom sib xyaw nthuav dav 30-60 zaug hauv 10-15 vib nas this, thaum kawg tsim cov ua npuas ncauj polyurethane nrog cov khoom rwb thaiv tsev kub zoo heev.
Cov txheej txheem tshuaj lom neeg no muaj ob qho kev cuam tshuam tseem ceeb:
1. Gel reaction: isocyanate reacts nrog polyol los tsim ib lub pob txha polyurethane polymer
2. Kev ua npuas ncauj: isocyanate ua rau dej sib xyaw ua ke los tsim cov pa roj carbon dioxide

Kev ua tau zoo heev ntawmMXC-BDMAcov tshuaj ua kom lub cev muaj zog

Peb lub MXC-BDMA (N,N-dimethylbenzylamine, CAS 103-83-3) yog ib qho tshuaj amine ua haujlwm tau zoo uas tau tsim los rau cov ua npuas dej khov kho, nrog rau cov txiaj ntsig tseem ceeb hauv qab no:

1. Kev tswj hwm cov tshuaj tiv thaiv kom meej

- Muab qhov sib npaug zoo tagnrho ntawm kev ua npuas dej / gelling (qhov sib piv ntawm cov tshuaj tiv thaiv tuaj yeem raug rau ± 3%)
- Xyuas kom meej tias muaj qhov nkhaus nce siab ruaj khov (qhov siab ntawm qhov nthuav dav <5%)
- Kho kom haum rau qhov kub thiab txias sib txawv thiab av noo (kev ua haujlwm ruaj khov hauv qhov ntau ntawm 5-35 ℃)

2. Zoo heev ua npuas ncauj zoo

- Tsim ib lub qauv kaw-cell sib xws (closed-cell ratio> 90%)
- Lub cheeb ntawm lub cell raug tswj hwm hauv qhov zoo tshaj plaws ntawm 100-300μm
- Ua kom lub zog sib txuas nrog lub substrate nce ntxiv 40% (ASTM D1623 test)

3. Cov txiaj ntsig ntawm cov txheej txheem

- Ua kom cov dej ntws pib nce ntxiv 25%, ua kom tiav cov qauv nyuaj
- Lub sijhawm kho kom zoo luv dua 15-20%, uas ua rau kev tsim kho zoo dua.
- Cov mis tsw qab tsawg (VOC <50μg / m³) txhim kho qhov chaw ua haujlwm.

Lub luag haujlwm tseem ceeb ntawmcov tshuaj catalystshauv kev tsim khoom SPF.

Raws li "tus neeg ua haujlwm tiv thaiv" ntawm kev tsim cov polyurethane, lub kaw lus catalyst ua kom muaj kev tsim cov ua npuas ncauj zoo los ntawm peb txoj hauv kev:
1. Kev tswj hwm Kinetic:
- Tswj lub sijhawm pib ua haujlwm kom raug (feem ntau yog 15-30 vib nas this)
- Kho qhov kub siab tshaj plaws ntawm exothermic (feem ntau tswj tau ntawm 140-160 ℃)
- Sib npaug ntawm cov roj tsim thiab cov polymer kho kom zoo
2. Kev txhim kho cov qauv:
- Cov tshuaj amine catalysts (xws li MXC-BDMA) tswj cov pa roj tsim
- Cov tshuaj catalysts hlau (xws li stannous octoate) tswj cov polymer cross-linking
- Kev siv cov khoom sib xyaw ua ke tuaj yeem tau txais cov qauv pore zoo tagnrho
3. Kev txhim kho kev ua tau zoo:
- Txhim kho qhov ruaj khov ntawm qhov ntev (qhov hloov pauv ntawm qhov ntim <1%)
- Txhim kho qhov ua kom thermal conductivity zoo (txog li 0.020-0.028W/m·K)
- Txhim kho lub zog kho tshuab (lub zog compression> 150kPa)

Kev daws teeb meem kev siv hauv kev lag luam

MXC-BDMA yog qhov tsim nyog rau kev tsim cov tshuaj tsuag ua npuas ncauj hauv cov cheeb tsam hauv qab no:

Kev rwb thaiv tsev

- Lub kaw lus rwb thaiv tsev phab ntsa sab nraud
- Txheej txheej rwb thaiv tsev tsis pub dej nkag
- Qhov project rwb thaiv tsev cia khoom txias

Cov khoom siv hauv kev lag luam

- Lub tsho tiv thaiv dej hauv cov kav dej
- Kev tiv thaiv rwb thaiv tsev ntawm lub tank
- Kev rwb thaiv tsev ntawm cov khoom siv ua haujlwm

Ib puag ncig tshwj xeeb

- Kev tsim kho qhov kub thiab txias tsawg (qis li 5 ℃)
- Daim ntawv thov nyob rau hauv cov cheeb tsam siab humidity (RH> 80%)
- Kev txau rau saum npoo thiab qab nthab

Kev txhawb nqa kev tshaj lij

Peb muab cov chaw tsim khoom siv ua npuas dej nrog:
- Kev pabcuam txhim kho cov mis: Kho cov catalytic system raws li koj cov khoom siv
- Kev kuaj mob txheej txheem: daws cov teeb meem uas tshwm sim xws li ua npuas ncauj ntsws thiab tawg
- Kev kuaj qauv: Muab 50-100g pob sim rau kev kuaj me me
- Kev cob qhia txuj ci: Tsis tu ncua tuav cov kev cob qhia txog kev siv tshuab SPF tsim khoom