Otu esi eme ka oge mmalite ụfụfụ (cream time) kwụsie ike na mmepụta nke ogwe osisi Sanwichi PU n'oge oke iru mmiri

Maka ndị na-emepụta panel Sanwichi na-agba ọsọ ahịrị lamination na-aga n'ihu, nsogbu mmepụta ole na ole na-akụda mmụọ karịa nke oge oge mmalite ụfụfụ (cream time). Bọdụ ndị na-agba ọsọ nke ọma n'oge ọkọchị na-etolite na mberede ntụpọ elu, oge ịghọ gel (gel time) na-agbatị, na ọnụego jụrụ ịrị elu - ihe niile n'ihi na iru mmiri ikuku gafere ebe a na-adịghị ahụ anya gburugburu 85% RH.

Nke a abụghị nkwekọrịta nrụpụta. Ọ bụ nsogbu kemistri nwere atụmatụ mbelata atọ ghọtara nke ọma.

Ihe Mere Iru Mmiri Ji Ebibie oge mmalite ụfụfụ (cream time)

A na-ekpebi oge mmalite ụfụfụ (cream time) nke sistemu polyurethane site na ọnụego mbụ nke mmeghachi omume NCO-OH, nke ndị na-eme ka amine tertiary na-akwado. N'ime sistemu kwụsiri ike, mmeghachi omume a na-aga n'ihu n'ọ̀tụ̀tụ̀ a pụrụ ịkọ amụma site na:

• Ụdị na ibu nke Catalyst (nke a na-akpọkarị 0.3-1.5 phr nke amine tertiary)
• Okpomọkụ sistemụ (nke a na-ejide na 20-25°C n'oge a na-ekesa ya)
• Polyol na isocyanate index (nke a na-akpọkarị 1.05-1.15 maka sistemụ siri ike)

Mgbe iru mmiri ikuku na-ebili n'elu 85% RH, usoro abụọ yiri ya na-akpaghasị nguzozi a:

1. Mba mmiri n'ime akụkụ polyol. Polyether polyols dị nwayọọ hygroscopic. N'ebe iru mmiri dị elu, mmiri ikuku na-agbasa n'ime polyol drum n'oge mmeghe, na-ekesa, na mgbasa ozi. Mmiri gbazere wee soro ndị otu polyol hydroxyl asọmpi maka isocyanate, na-emepụta CO₂ ma na-eme ngwa ngwa exotherm mmalite.
2. ** Ọbụlagodi na nchekwa drum na-achịkwa, igwe ihu igwe na-abanye n'ahịrị na-aga n'ihu na-ebu mmiri dị n'elu nke na-emeghachi omume na kọntaktị na ụfụfụ na-ebili, na-eme ka ọdịdị akpụkpọ ahụ dịkwuo elu.

Usoro abụọ a na-eme ka oge mmalite ụfụfụ (cream time) dị mkpụmkpụ, mana ha na-eme ya n'ụzọ na-ezighi ezi - mmeghachi omume dị ukwuu mgbe mmeghachi omume elu na-aga n'ihu. Ihe si na ya pụta: ntụpọ elu a na-ahụ anya (blisters, cratering, knit line) ọbụna mgbe nnukwu ụfụfụ na-ele anya nke ọma.

Atụmatụ Mbelata Atọ

Atụmatụ 1: Nhazigharị nke Catalyst

Ụzọ kachasị zie ezie bụ ịgbanwe ngwungwu ihe na-akpali akpali gaa na kemistri na-egbu oge.

• Belata ihe mkpali gel (PMDETA, DMCHA) site na 10-15%
• Mee ka ọnụọgụ blow catalysts (BL-11) bawanye n'ụzọ nha nhata
• Tinye obere amine nke na-egbu oge (dịka ọmụmaatụ, DABCO BL-17 ma ọ bụ ihe ndị yiri ya)

Azụmaahịa: oge iwepụ ngwaahịa site na mould (demould time) dị ntakịrị ogologo (nke na-abụkarị +5 ruo +10 sekọnd), nke nwere ike ịchọ obere mgbanwe ọsọ ahịrị.

Nsonaazụ a tụrụ anya ya: oge mmalite ụfụfụ (cream time) na-eme ka ọ kwụsie ike n'ime ±1 sekọnd n'ofe iru mmiri gburugburu 60-92% RH.

Atụmatụ 2: Mgbanwe nke Surfactant

Silicone surfactants na-achịkwa nhazi cell n'oge ụfụfụ na-ebili. N'okpuru ọnọdụ iru mmiri dị elu, ọkọlọtọ surfactants nwere ike ghara ịdị irè n'ime ka mgbidi cell guzosie ike n'oge mmeghachi omume mbụ nke ngwa ngwa.

• Gbanwee site na arọ molekul dị ala (MW) silicone surfactant ọkọlọtọ gaa na ụdị arọ molekul ka elu (MW) nke e mere maka ịnagide mmiri
• Mgbanwe nkịtị: 1.5-2.5 phr nke ọkwa na-anabata mmiri

Azụmahịa-mgbanwe: Ọnụ ego ihe eji arụ ọrụ dị ntakịrị elu na ihe ahịrị surfactant (ọkachasị +5-10% na ihe ahụ).

Nsonaazụ a tụrụ anya ya: Ọdịdị akpụkpọ ahụ elu na-adịgide adịgide n'agbanyeghị iru mmiri. Na-ebelata ọnụego ntụpọ elu site na 4-6% ruo n'okpuru 1%.

Atụmatụ 3: Mkpọcha Polyol Tupu Akpọcha

Maka arụmọrụ ebe mgbanwe na-agaghị ekwe omume (dịka ọmụmaatụ, nkọwa ndị ahịa ruru eru na-akpọchi usoro ahụ), ihe ọzọ bụ njikwa mmiri dị elu.

• Wụnye nkụ sieve molekul na ahịrị nchekwa polyol
• Debe ọdịnaya mmiri polyol n'okpuru 0.05% (nkọwapụta Karl Fischer nkịtị)
• Jiri ihe mkpuchi nitrogen kpọrọ nkụ na polyol barel n'oge a na-enye ya

Azụmahịa-mgbanwe: Itinye ego na akụrụngwa nkụ (ọkachasị $15,000-30,000 USD dabere na ikike ahịrị). Achọghị mgbanwe nhazi.

Nsonaazụ a tụrụ anya ya: Na-ewepụ usoro ahụ kpamkpam site na iru mmiri gburugburu, mana ọ chọrọ nlekọta akụrụngwa na-aga n'ihu.

Ịhọrọ Atụmatụ Ziri Ezi

Na omume, ọtụtụ ndị ahịa anyị na-arụkọ ọrụ na-agbaso Strategies 1 na 2 na nchikota - ngbanwe nke na-eme ka ọ dịkwuo mma jikọtara ya na mmiri na-anabata mmiri. Ngwakọta a na-enyekarị mmepụta kwụsiri ike n'ofe oke iru mmiri na-achọghị itinye ego ego.

Nnwale Ubi: Ihe A Ga-anwale

Tupu itinye aka na sistemụ emegharịrị n'ọ̀tụ̀tụ̀ mmepụta ihe, kwadoo na nnwale ahịrị onye nnọchi anya:

1. oge mmalite ụfụfụ (cream time) na oge ịghọ gel (gel time) A tụrụ ya na ọnọdụ iru mmiri atọ (60% RH, 75% RH, 90% RH e mere ka ọ dị ka ihe atụ)
2. Ọnụego ntụpọ dị n'elu gafee 100 panel na-esochi n'ọnọdụ iru mmiri ọ bụla.
3. Ike mkpakọ nke panel emechara (kwa EN 14509 ma ọ bụ ọkọlọtọ mpaghara kwekọrọ)
4. oge iwepụ ngwaahịa site na mould (demould time) a tụrụ ya na oge okirikiri mmepụta ugbu a
5. B1 ma ọ bụ B2 arụmọrụ na-egbochi ọkụ ka edobere maka ọkọlọtọ mpaghara SNI, EN ma ọ bụ ọdabara.

Nkwenye zuru oke na-ewe izu 2-4 site na nnata nlele ruo n'ụdị mmepụta tozuru oke.

Ịrụ ọrụ na MENGWEI na Nsogbu oge mmalite ụfụfụ (cream time)

Ọ bụrụ na ị na-agba ahịrị lamination na-aga n'ihu nke iru mmiri oge mmalite ụfụfụ (cream time) na-ebugharị, ndị otu teknụzụ anyị nwere ike ịnye:

• Ihe nlele mgbanwe emere ka ọ dị na akụkụ isocyanate gị dị ugbu a
• Nkwado nnwale ahịrị na usoro nkwenye ubi
• Akwụkwọ nkwado maka iwu ọkụ B1/B2 maka ọkọlọtọ mpaghara gị
• Akụkọ ịdị mma nke ogbe-site-otu-otu na-aga n'ihu

Nweta site na mpempe akwụkwọ Rịọ ọnụ ahịa yana ebumnuche oge mmalite ụfụfụ (cream time)/oge ịghọ gel (gel time) gị ugbu a, oke iru mmiri ikuku yana ọsọ ahịrị. Ụlọ nyocha R&D anyị dị na Jinshan na-anabatakarị n'ime ụbọchị azụmahịa ise site na usoro nhazi akwadoro.