Aliphatic polyamides ea meaho e fapaneng e hlahisitsoe khoebong, eo PA6, PA66, PA46, PA11 le PA12 ke tsa bohlokoa ka ho fetisisa.Ho senyeha ha oxidative ho PA ho itšetlehile ka tekanyo ea crystallinity le bongata ba karolo ea amorphous.Ho ea ka mokhoa oa setso, li-aliphatic polyamides li tsitsisoa ka letsoai le lenyenyane la koporo (ho fihlela ho 50 ppm) le kopantsoe le li-ion tsa halogen (tse kang iodine le bromide ions).Ho sebetsa hantle ha sistimi ena ea stabilizer hoa makatsa hobane li-ion tsa koporo li nkuoa e le thuso ea botsofali ho polyolefin.Mokhoa oa ho tsitsisa phello ea koporo / halogen composite system e ntse e ithutoa.
Li-amine tse nkhang hamonate ke li-stabilizer tse tloaelehileng tse eketsang LTTS, empa ha li sebelisoa PA, li ka baka ho fifala ha li-polymers.Phenol antioxidants e ka ntlafatsa 'mala oa mantlha kamora polycondensation ho tsitsisa aliphatic polyamide.Ka kakaretso, antioxidant ena e eketsoa pele karabelo ea polycondensation e felisoa.
Tafole e ka tlase e bapisa thepa ea li-stabilizer tse fapaneng tse sebelisetsoang aliphatic polyamide.
| Sistimi ea AO | Molemo | Bofokodi |
| Matsoai a koporo/iodide | E sebetsa haholo maemong a tlase Ha mocheso oa botsofali o ka holimo ho 150 ° C, o kenya letsoho haholo ho LTTS ea polymer. | Ho haella ha dispersibility ho li-polymers Leaching e etsahala ha bonolo ha e kopane le metsi kapa metsi / solvents E ka baka 'mala |
| Li-amine tse nkhang hamonate | E kenya letsoho haholo ho LTTS ea li-polymers | E-ba maemong a holimo phetoho mmala |
| Phenols | E kenya letsoho haholo ho LTTS ea li-polymers Ts'ebetso e ntle ea mebala E ka ekeletsoa nakong ea ts'ebetso ea mahloriso Ha ho na karabelo ea lehlakore e hlahang le li-polymer tse ling nakong ea ho kopanya |
Lithempereichara tse phahameng tsa botsofali (mohlala, ka holimo ho 150 ° C), lisebelisoa tsa copper/iodide stabilizer li bontša liphello tse ntle ka ho fetisisa.Leha ho le joalo, ka mocheso o tlase oa botsofali, phenolic antioxidants feela kapa hammoho le phosphites e ka sebetsa haholoanyane.Molemo o mong oa ho sebelisa li-antioxidants tsa phenolic ke hore li boloka 'mala o ka sehloohong oa li-polypolymers ho fihlela mocheso o tsofala ka katleho ho feta li-stabilizer tsa letsoai la koporo.
Ho fifala ha polymer ka mor'a ho tsofala ha mocheso ha ho fokotsehe ka tsela e tšoanang le thepa ea eona ea mochine.Ho fetoha ha 'mala ho ka etsahala le ka nako e khuts'oane ea lilemo, empa matla a ho tiea le bolelele ba polymer e ke ke ea ameha ho fihlela hamorao.
Lingoliloeng tse ngata li hlalosa lits'ebetso tse ngata tsa li-polyamide tse matlafalitsoeng ka khalase indastering ea likoloi, joalo ka li-blades tsa enjene, li-radiator caps le li-grilles, mariki le li-accumulators tse tsamaisang matla, matsoho a li-valve, lithaere, li-air brake contactors le li-hoods.Phenolic antioxidants, ekaba e le mong kapa e kopane le phosphite, ke li-stabilizers tse ntle ka ho fetisisa tsa GFR PA66.
Mokhoa oa motheo oa motsoako oa phenol + phosphite ke 1098 + 168, o ka sebelisoang ho mocheso o batlang o le tlase o sa ntlafatsoang, 'me 'mala oa extrusion oa ntlafatsoa.Leha ho le joalo, bakeng sa litsamaiso tsa polyamide tse kang khalase ea fiber e matlafatsang, mocheso oa ho sebetsa o phahame (hoo e batlang e le 300 ° C), 168 mocheso o phahameng oa ho senyeha ha mocheso, ka nako ena, hangata re sebelisa 1098 + S9228 motsoako o joalo oa ho hanyetsa mocheso o motle, oo hape o leng teng. foromo e sebelisoang haholo ho nylon ea mocheso o phahameng.
Kamora liphetho tsa liteko tse hlophisitsoeng, ho fumanoe hore 1098 + S9228 e ntse e na le sebaka sa ntlafatso ea ntlafatso ea mebala ea nylon e phahameng ea mocheso, mme Sarex Chemical e phatlalalitse lihlahisoa tse ntlafalitsoeng SARAFOS 2628P5 (phosphorus-based axiliary resistance) le SARANOX PA2624 (e sitisang phenol le phosphite). kopanelo) e na le ts'ebetso e ntle ho nylon e mosehla o mocheso o phahameng, 'me lintlha tse nepahetseng tsa tlhahlobo ke tse latelang:
PA66, 270 ° C extrusion e ngata le teko ea ho baka e chesang
| ■0.1%1098+0.2%9228 | 8.32 | 15.5 | 21.11 | 33.71 |
| ■0.1%109810.2%2628P5 | 3.85 | 10.88 | 17.02 | 21.16 |
| ■3%PA2624 | -3,25 | 1.87 | 4.94 | 12.21 |
Lintlha tse ka holimo li khethiloe ke Sarex Chemical Laboratory
Ha ho bapisoa le palo e tšoanang ea tlatsetso ea SARAFOS 2628P5 le S9228, 'mala oa extrusion e ngata le 120 °C polokelo ea mocheso bakeng sa 12h e na le ts'ebetso e ntle,' me ho hanyetsa ha hydrolysis ea sehlahisoa ka boeona ho boetse ho molemo ho feta S9228, e nang le kopo e ntle. menyetla ea ho fetola PA.
Ha ho na le litlhoko tse phahameng bakeng sa 'mala oa pele, ho kgothaletswa ho eketsa SARANOX PA2624, ho phaella ho foromo ea phofo, re ka boela ra fana ka bareki ba PA antioxidant masterbatches le likaroloana tse sa lefelloeng tsa li-antioxidant, tse loketseng ho eketsa le ho li hasanya, le ho thusa. workshop ya tlhahiso ho hloka lerole.
| PA66, extrusion e ngata ho 270 °C | 0.1%1098+0.2%9228 | 0.1%1098+0.2%2628P5 | 0.3% PA2624 |
| 1 extrusion |  |  |  |
| 3 extrusions |  |  |  |
| 5 extrusions |  |  |  |
| Bake ka 120 ° C, 12h
|  |  |  |
Lintlha tse ka holimo li khethiloe ke Sarex Chemical Laboratory
Nako ea poso: Nov-14-2022