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

Mfundo yopanga zipangizo zotetezera thovu lopopera

Spray Foam Insulation (SPF) ndi chipangizo chapamwamba chotetezera kutentha chomwe chimapangidwa mwa kusakaniza bwino zigawo ziwiri zofunika - polyol resin ndi isocyanate. Pamene zigawo ziwirizi zamadzimadzi zikasakanizidwa mu chipangizo chapadera chopopera, mankhwala amachitika mwachangu pansi pa mphamvu ya chothandizira, ndipo mpweya wa carbon dioxide umatulutsidwa nthawi yomweyo, zomwe zimapangitsa kuti chisakanizocho chikule nthawi 30-60 mu masekondi 10-15, pamapeto pake kupanga thovu la polyurethane lokhala ndi mphamvu zabwino kwambiri zotetezera kutentha.
Njira imeneyi ya mankhwala imakhala ndi zochitika ziwiri zazikulu:
1. Kuyankha kwa gel: isocyanate imakumana ndi polyol kuti ipange chigoba cha polyurethane polymer
2. Kutulutsa thovu: isocyanate imachita ndi madzi kuti ipange mpweya wa carbon dioxide

Kuchita bwino kwambiriMXC-BDMAchothandizira

MXC-BDMA yathu (N,N-dimethylbenzylamine, CAS 103-83-3) ndi chida chothandizira kwambiri cha amine chomwe chimapangidwa kuti chigwiritsidwe ntchito bwino kwambiri pochiza thovu lolimba, ndipo chili ndi ubwino wotsatirawu:

1. Kulamulira kolondola kwa zochita

- Amapereka bwino momwe thovu limagwirira ntchito/limagwirira ntchito bwino (chiŵerengero cha momwe zinthu zimachitikira chingakhale cholondola mpaka ±3%)
- Zimaonetsetsa kuti khola lokwera limakhala lokhazikika (kuchepa kwa kutalika kwa kukula <5%)
- Imasintha kutentha ndi chinyezi chosiyanasiyana (ntchito yokhazikika pakati pa 5-35℃)

2. Ubwino wa thovu wabwino kwambiri

- Amapanga kapangidwe ka maselo otsekedwa mofanana (chiŵerengero cha maselo otsekedwa> 90%)
- M'mimba mwake wa selo umayendetsedwa bwino kwambiri pa 100-300μm
- Kumawonjezera mphamvu yolumikizana ndi substrate ndi 40% (kuyesa kwa ASTM D1623)

3. Ubwino wa njira

- Zimawonjezera kusinthasintha koyambirira ndi 25%, kuonetsetsa kuti nyumba zovuta zidzadzazidwa kwathunthu
- Nthawi yokonza imachepetsedwa ndi 15-20%, zomwe zimapangitsa kuti ntchito yomanga ikhale yabwino.
- Fomula ya fungo lochepa (VOC<50μg/m³) imapangitsa malo ogwirira ntchito kukhala abwino.

Udindo waukulu wazoyambitsamu kupanga kwa SPF.

Monga "woyendetsa" wa polyurethane, makina othandizira amatsimikizira kupangidwa kwa thovu lapamwamba kudzera m'njira zitatu:
1. Malamulo a Kinetic:
- Yang'anirani bwino nthawi yoyambira kuchitapo kanthu (nthawi zambiri masekondi 15-30)
- Sinthani kutentha kwakukulu kwa exothermic (nthawi zambiri kumayendetsedwa pa 140-160℃)
- Kulinganiza kupanga mpweya ndi kuchuluka kwa polima
2. Kukonza kapangidwe kake:
- Ma catalyst a amine (monga MXC-BDMA) amalamulira kupanga mpweya
- Zothandizira zitsulo (monga stannous octoate) zimawongolera kulumikiza kwa polima
- Kugwiritsa ntchito kompositi kungapangitse kuti pakhale mawonekedwe abwino a pores
3. Kukweza magwiridwe antchito:
- Sinthani kukhazikika kwa miyeso (kuchuluka kwa kusintha kwa voliyumu <1%)
- Konzani bwino kutentha (mpaka 0.020-0.028W/m·K)
- Mphamvu yowonjezereka ya makina (mphamvu yopondereza> 150kPa)

Mayankho ogwiritsira ntchito mafakitale

MXC-BDMA ndi yoyenera kwambiri popanga thovu lopopera m'malo otsatirawa:

Kuteteza nyumba

- Dongosolo loteteza makoma akunja
- Denga losalowa madzi loteteza ku dzuwa
- Pulojekiti yoteteza kuzizira yosungiramo zinthu

Zipangizo zamafakitale

- Jekete loteteza mapaipi
- Chitetezo cha kutchinjiriza thanki
- Kuteteza zida zogwirira ntchito

Malo apadera

- Kapangidwe ka malo otentha kwambiri (osakwana 5℃)
- Kugwiritsa ntchito m'malo okhala ndi chinyezi chambiri (RH>80%)
- Kupopera pamwamba ndi padenga molunjika

Thandizo laukadaulo laukadaulo

Timapereka opanga thovu lopopera ndi:
- Utumiki wokonza ma formula: Sinthani makina othandizira malinga ndi zida zanu
- Kuzindikira njira: Kuthetsa mavuto ofala monga kuchepa kwa thovu ndi kusweka
- Kuyesa zitsanzo: Perekani mapaketi oyesera a 50-100g kuti muyesedwe pang'ono
- Maphunziro aukadaulo: Kuchita misonkhano yaukadaulo yopanga SPF nthawi zonse