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

Molao-motheo oa tlhahiso ea thepa ea ho thibela foam ea spray

Spray Foam Insulation (SPF) ke thepa e tsoetseng pele ea ho thibela mocheso e entsoeng ka ho kopanya likarolo tse peli tsa bohlokoa ka nepo - polyol resin le isocyanate. Ha likarolo tsena tse peli tsa metsi li kopantsoe sesebelisoa se khethehileng sa ho fafatsa, karabelo e potlakileng ea lik'hemik'hale e etsahala tlas'a ts'ebetso ea catalyst, 'me khase ea carbon dioxide e lokolloa ka nako e le' ngoe, e leng se etsang hore motsoako o atolohe ka makhetlo a 30-60 ka metsotsoana e 10-15, qetellong ho thehoe foam ea polyurethane e nang le litšobotsi tse ntle tsa ho thibela mocheso.
Ts'ebetso ena ea lik'hemik'hale e na le liketso tse peli tsa mantlha:
1. Karabelo ea gel: isocyanate e arabela le polyol ho etsa masapo a polyurethane polymer
2. Karabelo ea moholi: isocyanate e arabela le metsi ho hlahisa khase ea carbon dioxide

Tshebetso e ntle haholo eaMXC-BDMAsesebelisoa sa ho baka

MXC-BDMA ea rona (N,N-dimethylbenzylamine, CAS 103-83-3) ke sesebelisoa sa amine se sebetsang hantle haholo se ntlafalitsoeng bakeng sa foam e thata ea spray, ka melemo e latelang ea mantlha:

1. Taolo e nepahetseng ea karabelo

- E fana ka tekanyo e ntle ea karabelo ea foam/gelling (karolelano ea karabelo e ka nepahala ho ±3%)
- E netefatsa hore mothapo o nyolohang o tsitsitse (phapang ea bophahamo ba katoloso <5%)
- E ikamahanya le mocheso o fapaneng le mongobo o tloaelehileng (ts'ebetso e tsitsitseng pakeng tsa 5-35℃)

2. Boleng bo botle ba foam

- E bopa sebopeho se tšoanang sa sele e koetsoeng (karolelano ea sele e koetsoeng >90%)
- Bophara ba sele bo laoloa ka tekanyo e ntle ea 100-300μm
- E eketsa matla a ho kopana le substrate ka 40% (teko ea ASTM D1623)

3. Melemo ea ts'ebetso

- E eketsa phallo ea metsi ea pele ka 25%, e netefatsa ho tlatsoa ka botlalo ha meaho e rarahaneng
- Nako ea ho lokisa e khutsufalitsoe ka 15-20%, e leng se ntlafatsang katleho ea kaho.
- Foromo e nang le monko o fokolang (VOC<50μg/m³) e ntlafatsa tikoloho ea mosebetsi.

Karolo ea bohlokoa eali-catalysttlhahiso ea SPF.

Jwalo ka "mokhanni wa karabelo" wa tlhahiso ya polyurethane, sistimi ya catalyst e netefatsa ho thehwa ha foam ya boleng bo hodimo ka mekgwa e meraro:
1. Taolo ea Kinetic:
- Laola nako ea ho qala karabelo ka nepo (hangata metsotsoana e 15-30)
- Fetola mocheso o phahameng ka ho fetisisa oa exothermic (ka kakaretso o laoloa ho 140-160℃)
- Ho leka-lekanya tlhahiso ea khase le sekhahla sa ho folisa sa polymer
2. Ntlafatso ea sebopeho:
- Li-catalyst tsa amine (tse kang MXC-BDMA) li laola ho thehoa ha khase
- Li-catalyst tsa tšepe (tse kang stannous octoate) li laola ho hokahanya ha polymer
- Tšebeliso ea motsoako e ka etsa hore ho be le sebopeho se setle sa masoba
3. Ntlafatso ea ts'ebetso:
- Ntlafatsa botsitso ba litekanyo (sekhahla sa phetoho ea molumo <1%)
- Ntlafatsa ho tsamaisa mocheso (ho fihlela ho 0.020-0.028W/m·K)
- Matla a ntlafalitsoeng a mechini (matla a khatello> 150kPa)

Litharollo tsa ts'ebeliso ea indasteri

MXC-BDMA e loketse haholo tlhahiso ea foam ea spray libakeng tse latelang:

Ho thibela moaho

- Sistimi ea ho thibela lebota ka ntle
- Lera la ho thibela metsi le sa keneleng metsi marulelong
- Morero oa ho thibela ho boloka lintho ka serameng

Lisebelisoa tsa indasteri

- Jakete ea ho thibela liphaephe
- Tšireletso ea ho thibela ho ruruha ka tanka
- Ho thibela ho tjheseha ha disebediswa tsa tshebetso

Tikoloho e khethehileng

- Kaho ea tikoloho ea mocheso o tlase (e ka tlase ho 5℃)
- Tšebeliso libakeng tse mongobo o phahameng (RH>80%)
- Ho fafatsa bokaholimo le siling ka ho otloloha

Tšehetso ea botekgeniki ea litsebi

Re fa bahlahisi ba foam ea spray ka:
- Tšebeletso ea ntlafatso ea foromo: Lokisa sistimi ea catalytic ho latela liparamente tsa lisebelisoa tsa hau
- Tlhahlobo ea ts'ebetso: Rarolla mathata a tloaelehileng a kang ho fokotseha ha foam le ho petsoha
- Teko ea sampole: Fana ka lipakete tsa teko tsa 50-100g bakeng sa liteko tse nyane
- Koetliso ea botekgeniki: Tšoara lithupelo tsa theknoloji ea tlhahiso ea SPF khafetsa