Okpomọkụ dị obosara Teepu PTFE ga-ejikọta nke ọma na -70°C (ma ọ bụ ala) wee lanarị ikpughe na-aga n'ihu na 200-260°C - ogologo nke karịrị 300°C. Nke a na-achọ usoro nrapado nke na-anọgide na-agbanwe agbanwe na-enweghị ndakọrịta ọnụ ma ọ bụ nkwụsị nke ihu na nke ọ bụla.
Ngwunye nrapado bụ ihe nrapado siri ike pụrụ iche nke silicone (PSA) nke etinyere n'elu ihe nkiri PTFE emeziri n'elu ma ọ bụ akwa fiberglass nwere PTFE. Isi ihe na-eme ka arụmọrụ kwụsie ike n'ofe windo ọnọdụ okpomọkụ dị otú ahụ bụ ịmepụta netwọk na-agbanwe agbanwe - ihe nhazi nke na-eme ka mmiri na-ekpo ọkụ dị ala, nkwụsi ike na-ekpo ọkụ dị elu, na nkwụsị ọkụ ọkụ.
Aokai PTFE ewepụtala teepu PTFE dị oke ọkụ site na iji ụkpụrụ akọwara n'okpuru. Edemede a na-akọwa ihe anọ bụ isi imewe: nhazi oyi akwa mgbanwe, microstructure biphasic agwaetiti, gradient crosslinking, na ihe mejupụtara ihe mejupụtara okpomoku kwụsiri ike.
Ntugharị oyi akwa n'etiti mkpụrụ osisi na nrapado oyi akwa
1. Isi ihe ịma aka - PTFE elu ike
PTFE nwere ike dị ala nke ukwuu (18-20 dynes / cm). Mkpuchi ozugbo nke nrapado na-achọ ịpụpụ n'oge ịnya igwe ọkụ n'ihi ọnụọgụ mgbasawanye ọkụ na-adaghị adaba - PTFE gbasaa 30-40x karịa fiberglass.
2. Nkwalite elu elu na nrịbama primer
Iji dozie nke a, PTFE elu na-enweta kemịkal etching na sodium-naphthalene complexes ma ọ bụ ọgwụgwọ plasma iji webata C = C okpukpu abụọ na otu polar nwere oxygen. Mgbe nke ahụ gasịrị, a na-etinye silicone primer raara onwe ya nye nke dị obere (dịka ọmụmaatụ, onye na-ahụ maka njikọ njikọ silane nwere vinyl) iji mepụta akwa 'molecular bridge' na interface site na njikọ kemịkalụ.
3. Ihe na-eme ka nrụgide nrụgide
N'ụdị ụfọdụ, a na-etinye akwa modul dị ala, nke dị elu na-agbanwe oyi akwa etiti (jel-dị ka silicone nke nwere akụkụ ndị na-agbanwe agbanwe) n'etiti oyi akwa na-arụ ọrụ na akwa akwa akwa akwa. Nke a na-etinye nrụgide n'etiti ihu site na mgbanwe okpomọkụ dị nkọ na-ebute ma gbochie ibuli elu nke nrapado.
Iwu nke Microstructure nke oke osimiri-Agwaetiti
Isi nrapado matrix bụ a kpochapụwo PSA usoro nke nwere MQ silicone resin (agwaetiti agbasasịa na-adọ) na elu-molekul arọ polysiloxane (na-aga n'ihu oké osimiri na-adọ).
1. MQ silicone resin - akụkụ nke agwaetiti siri ike
Na-enye nchikota, njide ike, na oke okpomọkụ na-eguzogide. Kpọmkwem akara nke ya M/Q molar ratio (nke a 0.6-0.9) na urughuru size dispersion ana achi achi edo embedding n'ime na-aga n'ihu na-adọ na-etolite anụ ahụ crosslinking saịtị.
2. Polysiloxane na-aga n'ihu - oge mmiri dị nro
Na-enye ngwa ngwa, mmiri mmiri dị ala, na mgbanwe. A na-ahọrọkarị rọba silicone methyl vinyl dị arọ ma ọ bụ methyl phenyl vinyl silicone roba.
3. Nkwalite pụrụ iche maka oke okpomọkụ
A na-etinye obere akụkụ siloxane-phenyl dị elu . Ndị otu Phenyl na-egbochi kristal dị ala nke polydimethylsiloxane, na-eweda okpomoku nkuchi nke nrapado n'okpuru -100°C. Ka ọ dị ugbu a, ndị otu phenyl na-eme ka nguzogide nbibi nke thermal-oxidative na oke okpomọkụ, na-eme ka usoro mmiri na-aga n'ihu na-ejigide ngbanwe dị elu n'ofe windo okpomọkụ sara mbara.
Multi-Layer ma ọ bụ Gradient Crosslinking Design for thermal Shock Resistance
A na-anakwere usoro mkpuchi mkpuchi okpukpu abụọ iji dozie nkwụsi ike na-ekpo ọkụ na oke okpomọkụ:
1. N'ime oyi akwa (akụkụ substrate)
, Njupụta crosslink dịtụ elu na-ebuga ike na-ejide okpomọkụ dị elu na ike jikọrọ ọnụ dị ka usoro na-eguzogide shear.
2. N'elu oyi akwa (njikọ elu)
Njupụta crosslink dị ala dị ala nwere ụdọ molikula mkpanaka nke ukwuu, na-eme ka wetting ngwa ngwa na adherends na obere okpomọkụ yana ihe mbido mbụ zuru oke.
N'aka nke ọzọ, a na-etolite gradient na-aga n'ihu nke njupụta crosslink site n'ime ruo n'akụkụ mpụta n'ime otu oyi akwa site na usoro ọgwụgwọ, na-ejikọta mpaghara ọrụ siri ike ma na-agbanwe agbanwe.
Aokai PTFE na-eji teknụzụ gradient crosslinking technology iji hụ na teepu na-anọgide na-agbanwe na -70 ° C (na-enye aka na mbido mbụ) ka ọ na-ejigide ike na 260 ° C (na-egbochi nnyefe na ntanye).
Ngwakọta Ngwakọta Okpomọkụ kwụsiri ike
A na-agbasasị silica na-acha ọkụ na-acha ọkụ na-ekpo ọkụ na matriks nrapado maka nkwado, jikọtara ya na ụdị abụọ nke ihe na-arụ ọrụ:
1. Ihe mgbakwunye ọkụ na-eguzogide
Cerium oxide, ígwè oxide, na ihe ndị ọzọ na-eme ka ọkpụkpụ na-egbochi oxidative hardening nke agbụ akụkụ siloxane na mmebi ọkpụkpụ azụ n'okpuru nnukwu okpomọkụ. Ndị antioxidants ndị a na-agbatị ndụ ọrụ na 260 Celsius.
2. Thermal conductive fillers
Micron-sized aluminum nitride, alumina , wdg, na-ekpochapụ ọkụ ngwa ngwa iji belata mkpokọta okpomọkụ dị n'ime ma belata ịka nká. Nke a dị mkpa karịsịa maka ngwa ebe a na-eji teepu eme ihe dị ka ihe na-ekpo ọkụ ma ọ bụ ebe ikpo ọkụ sitere na mkpụrụ nwere ike ime ka mmebi nrapado dịkwuo ngwa.
Ihe ndochi niile chọrọ ngafe elu ma ọ bụ ọgwụgwọ silane iji zere oke modul ịrị elu na nrapado ike na obere okpomọkụ.
Nchịkọta – Netwọk na-eme mgbanwe maka ọnọdụ dị oke egwu
Ngwunye nrapado nke teepu PTFE obosara-okpomọkụ bụ n'ezie mgbakwunye platinum-catalyzed crosslinking microphase-kewapụrụ netwọk agbakwunyere na MQ resin chemical anchoring saịtị na ngwakọ phenyl ogologo yinye siloxanes. Site na gradient crosslinking na teknụzụ na-ejikọta ọnụ, ọ na-ejikọta nke ọma:
Wetting ngwa ngwa na mgbanwe dị elu na obere okpomọkụ
Njikọ siri ike na arụ ọrụ mgbochi oxidation na oke okpomọkụ
Aokai PTFE na-arụpụta teepu PTFE dị oke ọkụ site na iji usoro nrapado a. Nkọwapụta omenala - gụnyere ọkpụrụkpụ, crosslink gradient, na ntinye ndochi - dị maka mkpa ngwa akọwapụtara.
Anyị na-agbaso nkà ihe ọmụma ọrụ nke ọkachamara na iguzosi ike n'ezi ihe, raara onwe ya nye iji nye gị ngwọta zuru oke nke otu nkwụsị na nkwado echiche!
