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

Nheyo yekugadzira zvinhu zvekudzivirira furo respray

Spray Foam Insulation (SPF) chinhu chekupisa chakagadzirwa nekusanganisa zvinhu zviviri zvakakosha - polyol resin neisocyanate. Kana zvikamu zviviri izvi zvemvura zvikasanganiswa mumudziyo wekupfapfaidza wakakosha, makemikari anokurumidza kuitika pasi pesimba re catalyst, uye gasi re carbon dioxide rinoburitswa panguva imwe chete, zvichiita kuti musanganiswa uwedzere ka30-60 mumasekonzi gumi kusvika gumi nemashanu, zvichizopedzisira zvaita furo re polyurethane rine hunhu hwakanaka hwekupisa.
Maitiro aya emakemikari ane maitiro maviri makuru:
1. Kupindura kwejel: isocyanate inopindirana nepolyol kuti igadzire skeleton yepolyurethane polymer
2. Kubuda kwefuro: isocyanate inopindirana nemvura kuti ibudise gasi recarbon dioxide

Kushanda kwakanaka kwazvoMXC-BDMAkataviridzi

MXC-BDMA yedu (N,N-dimethylbenzylamine, CAS 103-83-3) imushonga weamine unoshanda zvakanyanya wakagadzirirwa furo re spray rakapfapfaidzwa, rine mabhenefiti anotevera:

1. Kudzora maitiro nemazvo

- Inopa mukana wakakodzera wekuita furo/gelling reaction balance (reaction ratio inogona kuva chaiyo kusvika ±3%)
- Inoita kuti curve ikwire yakasimba (kuwedzera kutsauka kwekukwirira <5%)
- Inoenderana nekupisa kwakasiyana-siyana uye hunyoro (kushanda kwakagadzikana pakati pe5-35℃)

2. Hunhu hwakanaka hwefuro

- Inogadzira chimiro chakafanana chemasero akavharwa (chiyero chemasero akavharwa>90%)
- Dhayamita yemasero inodzorwa munzvimbo yakakodzera ye100-300μm
- Inowedzera simba rekubatana ne substrate ne40% (ASTM D1623 test)

3. Zvakanakira maitiro

- Inowedzera kuyerera kwekutanga ne25%, zvichiita kuti zvivakwa zvakaoma zvizadzwe zvakakwana
- Nguva yekugadzika inopfupikiswa ne15-20%, izvo zvinovandudza kushanda zvakanaka kwekuvaka.
- Fomura yekunhuhwirira kushoma (VOC<50μg/m³) inovandudza nzvimbo yekushanda.

Basa guru rezvinokonzeresamukugadzirwa kweSPF.

Se "reaction conductor" yekugadzira polyurethane, sisitimu ye catalyst inovimbisa kuumbwa kwefuro remhando yepamusoro kuburikidza nenzira nhatu:
1. Mutemo weKinetic:
- Kudzora nguva yekutanga kwekuita (kazhinji masekondi 15-30)
- Gadzirisa tembiricha yepamusoro ye exothermic (inowanzo dzorwa pa 140-160℃)
- Kuenzanisa kugadzirwa kwegasi uye mwero wekupisa kwepolymer
2. Kugadzirisa chimiro:
- MaAmine catalysts (akadai seMXC-BDMA) ndiwo anotungamira pakuumbwa kwegasi
- Zvinhu zvinokonzeresa simbi (zvakadai se stannous octoate) zvinodzora polymer cross-linking
- Kushandiswa kwemusanganiswa kunogona kuita kuti pave nechimiro chakanaka cheburi
3. Kuvandudza mashandiro:
- Kuvandudza kugadzikana kwezvikamu (huwandu hwekuchinja kwehuwandu <1%)
- Gadzirisa kufambiswa kwemhepo nekupisa (kusvika ku0.020-0.028W/m·K)
- Simba remuchina rakawedzerwa (simba rekudzvanya>150kPa)

Mhinduro dzekushandisa muindasitiri

MXC-BDMA inonyanya kukodzera kugadzirwa kwefuro rekupfapfaidza munzvimbo dzinotevera:

Kudzivirira chivakwa

- Sisitimu yekudzivirira madziro ekunze
- Denga rinodzivirira mvura
- Chirongwa chekudzivirira kuchengetwa kwechando

Midziyo yeindasitiri

- Jaketi rekudzivirira mapaipi
- Kudzivirira kuputira tangi
- Kudzivirira michina yekugadzira

Nzvimbo yakakosha

- Kuvakwa kwenzvimbo ine tembiricha yakaderera (yakaderera se5℃)
- Kushandiswa munzvimbo dzine hunyoro hwakawanda (RH>80%)
- Kupfapfaidza pamusoro nepadenga

Rutsigiro rwehunyanzvi hwehunyanzvi

Tinopa vagadziri vemafuro ekupfapfaidza ne:
- Sevhisi yekugadzirisa fomura: Gadzirisa sisitimu ye catalytic zvichienderana neparamita yemidziyo yako
- Kuongorora maitiro: Gadzirisa matambudziko akajairika akadai sekupwanyika kwefuro uye kutsemuka
- Kuyedza kwemuenzaniso: Ipai mapaketi ekuyedza e50-100g ekuyedza madiki
- Kudzidziswa kwehunyanzvi: Kugara uchiita misangano yetekinoroji yekugadzira SPF