Urea-formaldehyde resins: ntau lawm, lub zog thiab daim ntawv thov

Urea-formaldehyde resins yog lug siv nyob rau hauv kev tsim kho, ntoo thiab lwm yam lag luam. Muaj txoj kev uas yuav ua lawv xub pib nyob rau hauv lub US nyob rau hauv 1927. Dag zog thiab kev dej kuj polyesters thiab epoxy resins xws ntaub ntawv yog dog dig tsis tau zoo. Nyob rau lwm cov tes, thiab ua rau lawv npaum li cas cheaper.

Yuav ua li cas yuav ua rau

Tau cob CFS, raws li twb tau pom los ntawm lub npe, los ntawm polycondensation ntawm formaldehyde nrog urea. Lawv sawv cev rau ib tug uas tsis yog-flammable aqueous ncua kev kawm ntawv nyob rau lub viscosity thiab xim yuav sib txawv nyob ntawm seb lub qib. Qhuav ntawm urea-formaldehyde resins feem ntau yuav siv cov tshwj xeeb, jacketed thiab stirrer particular, apparatuses. Tag nrho raug txheej txheem ntawm tej khoom yuav peb tej kauj ruam:

• polycondensation;

• acidic hws;

• kom qhuav.

Lub polycondensation cob yog nqa tawm nyob rau hauv ib tug alkaline nruab nrab ntawm ib tug pH ntawm cov tshuaj tiv thaiv cov tshuaj sib npaug zos rau 7.5-8. Thaum lub sij hawm tsim txoj kev yuav xyuas kom meej tias cov hniav puas piv urea: formaldehyde yog 1: 1.6-1.9.

Lub acidic hws yog nqa tawm nyob rau hauv ib tug nruab nrab nrog pH = 4.5-4.8. Rau ntawm no theem, vim lub zog molecular yuag pib nce dramatically cov viscosity ntawm cov tshuaj. еще одну порцию карбамида. Thaum kawg ntawm lub acidic hws cov tshuaj tiv thaiv nyob rau hauv lub cob ntxiv rau lwm ntawm lub urea. Qhov yuav tsum tau npaum li cas ntawm qhov no yam khoom uas yog xam yog li ntawd lub hniav puas piv ntawm lub Cheebtsam nyob rau hauv lub resulting tov yog 1: 1.3-1.4. Nyob rau hauv lub qhuav kauj ruam cov cob yog tom mus rau lub yam txheeb ze viscosity qhov tseem ceeb. продукт охлаждают и модифицируют с целью снижения его токсичности. Thaum lub theem kawg cov khoom yog txias thiab yog kho kom txo nws toxicity.

Scope ntawm kev siv

Urea-formaldehyde cob yog siv (Formula N = CH2 C = O thiab NH2 HOCH2NH C = NH2) tau nyob rau hauv lub ntau lawm:

• Fiberboard thiab particleboard;

• plywood;

• putties, xim tsev thiab varnishes;

• ya raws resistant ntawv thiab paperboard (impregnation);

• ua npuas ncauj.

карбамидоформальдегидная (КФ-МХ2) в бурении . Tsis tas li ntawd feem ntau siv urea cob (KF-MX2) nyob rau hauv drilling. Nyob rau hauv cov ntaub ntawv no nws yog siv raws li ib lub hauv paus MAAs slurry. Cov yav tas, nyob rau hauv lem, yog khov sib tov uas muaj peev xwm tawv sai sai nyob rau hauv cov huab cua. Maas slurries yog siv mas rau phiaj lub casing thiab los tiv thaiv lawv los ntawm corrosion.

Av nplaum-raws li CFS

Thaum lub qhauj ntawm ntoo kev lag luam nyob rau hauv nws cov ntshiab daim ntawv yog tsis tshua muaj siv CFS. Ntau ntau yog lub ntsiab keeb raws li siv nyob rau hauv ntoo urea cob nplaum. Lub ntsiab ntawm ntau yam khoom ua rau lub hauv paus ntawm CFS, muaj tsib:

• EC-B - ceev curing nplaum;

• CF-O - General hom phiaj (formaldehyde cov ntsiab lus tsis siab tshaj 0.25%);

• KF-MT - tsis muaj tshuaj lom, siv rau zus tau tej cov fiberboard thiab particleboard;

• KF-F - nrog nce nqi;

• KF-BZ - combines qhov zoo ntawm lub hom EC-B thiab KF-F.

Quick-CF-B adhesives txua ntoo qhauj ntawm kev lag luam no mas siv nyob rau hauv qhuav ntawm plywood thiab rooj tog zaum hauv ob sab phlu laug cam rau ib leeg-ncua presses. Malotokischny khoom CF-O yog siv tau nyob rau feem ntau tsuas rau gluing ntawv. Tsis tas li ntawd, qhov no nplaum tej zaum yuav siv nyob rau hauv qhov siv thiab ua plywood. Chipboard thiab fiberboard nrog nws siv yog tsis ua. Zus tau tej cov paib raws li nyob rau hauv lub nti los yog fiber khoom yog thov CF-MT cim.

Nplaum uas muaj nqi yog zoo meej rau txuas tag nrho cov hom ntawm cov rooj tog qhov chaw. Plan tej zaum nws kuj yuav siv tau ntxiv dag zog rau cov tsis muaj zog xau. Universal adhesives KF-BZ yog feem ntau siv nyob rau hauv qhov siv thiab ua plywood thiab rooj tog zaum. Tsis tas li ntawd, lawv yuav tsum tau siv nyob rau hauv qhuav ntawm ntau hom ntawm joinery khoom. Nyob ntawm seb lub hom tua tag nrho cov adhesives raws li nyob rau hauv lub FSC yuav siv tau rau ob leeg kub thiab txias gluing.

Tej zaum nyob rau hauv kev tsim kho, ntoo thiab thiaj li nyob. D. Yog siv thiab tshwj xeeb adhesives nrog ib tug txawv tsi hloov kho additives.

Cov khoom ntawm cob MT-mob CF lub cev

Specifications ntawm urea-formaldehyde resins, nyob ntawm seb daim ntawv thov tej zaum yuav txawv. Los ntawm cov lus hauv qab no qhia rau thaj chaw ntawm cov feem ntau nrov KF-MT cob siv nyob rau hauv qhuav ntawm fiberboard thiab particleboard.

Lwm yam hom KF KF-MT-resins yog distinguished los ntawm cov txo viscosity ntawm ib tug kuj siab qhuav teeb meem. Tej yam no cia kom paub nws nyob rau hauv mixers nrog airless tsuag. Cov kev siv ntawm tej khoom, nyob rau hauv lem, ua tau ib tug tseem ceeb yuav txo tau nyob rau hauv dej ntawm cov ntoo kho nrog cob hais thiab raws li txo lub sij hawm ntawm nias daim hlau.

Impregnating cob (SKFP)

Qhov no zoo ntawm CFS yog siv nyob rau hauv qhov siv thiab ua cov dej-resistant duab los qhia thiab daim ntawv. Tej zaum nws kuj yog siv rau impregnate lub hniav yob films, plywood thiab particleboard thiab fiberboard. Cov nram qab no cov lus qhia tau hais tias tus yam ntxwv ntawm cov khoom.

Cov yam ntxwv ntawm cov cob siv rau zus tau tej cov coatings

Rau lub hom phiaj no, feem ntau thov khoom hom K-421-02 Nruab nrab yog melaminokarbamidoformaldegidnaya pob tshab cob kua muaj li nram qab no cov khoom:

Properties KF-MX2

Urea-formaldehyde resins siv los tsim MAAs slurries yuav tsum tau tag nrho ua raws li GOST.

Urea formaldehyde ua npuas ncauj: lub Scope ntawm siv

Cov khoom no yog tsuas yog siv nyob rau hauv kev tsim kho raws li lub rwb thaiv tsev ntaub. Nws yuav siv tau rau rwb thaiv tsev ntawm tus mob khaub thuas:

• phab ntsa;

• ru tsev chaw;

• intermediate plag tsev thiab ceilings.

Nyob rau hauv kev sib piv nrog cov pa txhab polystyrene, polystyrene CFS muaj ib tug tseem ceeb kom zoo dua. Qhov no cov ntaub ntawv uas yog kiag li uas tsis yog-flammable. urea-formaldehyde cob yog ib pab pawg neeg ntawm thermosetting cov ntaub ntawv. Qhov ntawd yog qhov rov qab cov tshuaj tiv thaiv nyob rau hauv lawv muaj peev xwm tsis yog los ntawm txhais. Raws li, CFS-ua npuas ncauj thaum lub sij hawm qhov hluav taws kub tsis tsim ib tug yaj. Cov xwb - nyob rau hauv tus ntawm kub nws loses hnyav me ntsis los ntawm allocating uas tsis yog-tej rau tib neeg noj qab haus huv, nitrogen thiab cov pa roj carbon dioxide. Cov kev pab cuam lub neej ntawm lub ua npuas ncauj nyob rau hauv no hom yog txog tib yam li hais tias ntawm lub extruded polystyrene - txog 80 xyoo. Qhov no cov ntaub ntawv uas yuav siv tau nyob rau hauv daim ntawv ntawm daim hlau thiab nyob rau hauv kua hauv lub xeev. Nyob rau hauv lub caij nyoog kawg no cov ntaub ntawv, qhov loj yog tsuas poured mus rau hauv cov kab noj hniav ntawm ntau hom ntawm lub tsev lug.

Yuav ua li cas yuav ua rau ua npuas ncauj CFS

Rau cov thawj lub sij hawm no nthuav tsab xov xwm nyob rau hauv lub lig 30-ies nyob rau hauv lub teb chaws Yelemees. Nyob rau hauv Teb chaws Europe, nws yog dav siv nyob rau hauv kev tsim kho ntawm vaj tse cov lug. Nyob rau hauv 30% ntawm cov neeg nrog ntau yam ntawm rwb thaiv tsev walling siv cov khoom siv no. Nyob rau hauv xyoo tsis ntev los ntau thiab ntau nrov mob CFS-ua npuas ncauj yuav nyob rau hauv Russia.

Raug technology ntawm no rhaub yog tus yooj yim. Ntawm kev muag khoom muaj txawm tias ib tug tshwj xeeb, kuj pheej yig khoom, yuav hais tias, nyob rau hauv tus, yuav ua tau leej twg. Khiav lag luam xws sib raws li nram no:

• nyob rau hauv ib tug ntawm cov ntim uas muaj nrog ib tug dej tshuaj ntawm phosphoric acid thiab ib tug npuas tawm neeg sawv cev;

• nyob rau hauv lwm lub thawv nws tus kheej tso rau kom zoo urea cob;

• nyob rau hauv ib tug thoob qhib ub.

Rau nws cov khoom Cheebtsam siv haib twj tso kua mis. Urea-formaldehyde cob thiab ua npuas ncauj kwj yog distilled lawv nyob rau hauv ib tug tshwj xeeb tov. Cov uas ua loj nyob rau hauv lub thawv yog poured mus rau hauv cov kab noj hniav los ntawm cov bight Siv nozzle.

Lub zog ntawm cov cob siv rau zus tau tej cov ua npuas ncauj

Rau lub hom phiaj no, qhov kev siv feem ntau yog siv cov khoom hom KFZH-PV. Qhov no kua cob yog dawb los yog lub teeb-xim av xim, specifications uas yuav tsum phim yuav tsum GOST.

Raws li sau tias CF-cob

Yog li, kuv pom heev ntau nyob rau hauv qhov kev siv kev lag luam thiab urea cob daim ntawv thov. Cov khoom no yog cim raws li cov uas yuav tsum tau ntawm GOST 14192. Lub daim ntawv lo rau ntawm lub khob nrog CFS los yog invoice yuav tsum tam sim no:

• Cov chaw tsim tshuaj paus lub npe nrog nws trademark;

• net luj;

• Cob cim;

• lub hnub ntawm kev siv thiab ua;

• batch tooj;

• lub los ntawm tus txheej txheem nws tus kheej.

Raws li nws yuav tsum tau ntim cob

Loj txua ntoo thiab siv tuam txhab uas muag yuav cov khoom no feem ntau yog nyob rau hauv loj heev ntau. Nyob rau hauv cov ntaub ntawv no, lub urea-formaldehyde cob KF yog tauj mus rau nws lo lus uas peb nyob rau hauv railway tsheb hlau luam. me batch sau rau hauv steel drums. Tsis ntev los no ua ntej yuav siv, raws li GOST 13950, yuav tsum tau kom huv si rinsed. Standards cia casting cob xws li nyob rau hauv lub multi-chim nrog me sab nraud tsis xws luag.

xeem txoj kev

Noj urea cob batches nroj tsuag (nrog rau cov tib yam ntxwv thiab uas tsis muaj ntau tshaj li 200 tons). Mus xyuas qhov zoo ntawm cov khoom raug sim. Nyob rau hauv thawj theem ntawm lawv lub chaw ua khoom:

• sampling point kuaj hlau raj;

• compound nrog muab tag nrho cov qauv tso rau hauv ib khob hub;

• Cov ntawv lo nrog cov hnub thiab qhov chaw ntawm cov qauv.

Tiag tiag, cov kev xeem rau lawv tus kheej tuaj yeem suav nrog kev tshuaj xyuas pom kev, nrog rau kev txiav txim siab hauv kev kuaj xyuas:

• Qhov loj ntawm cov khoom seem qhuav ntawm txhua tus qauv;

• Pawg feem ntawm dawb formaldehyde;

• Concentration ntawm hydrogen ions;

• Gelatinization sijhawm;

• Miscibility nrog dej;

• Tensile zog.

Yuav ua li cas coj thiab khaws cia kom raug

Thauj urea cob (Class ntawm kev txaus ntshai ntawm lub substance - II) yuav nyob rau hauv tag nrho cov thauj hom. Thaum kub hauv qab 0 ° C, tsuas muaj cov tso tsheb hlau luam nrog cov txee cua kub lossis cov thermal insulation coatings. Nyob rau tom kawg rooj plaub, lub cua sov yog nqa tawm los ntawm kev pub dej kub rau hauv lub thawv ntoo. CFS kub tom qab txoj kev ua no yuav tsum tsis pub tshaj 25 ^C. Los tsim chav cua kub forbidden khoom.

Nyob rau hauv lub caij ntuj sov, thaum huab cua los ntawm t 25 ^C, thauj cob tsis tau ntev tshaj li 10 hnub. Khaws cov khoom ntawm qhov kub ntawm tsis pub tsawg tshaj 5 ° C thiab tsis tshaj 20 ° C rau hauv lub thawv kaw nruj nreem. Nws tsis muaj cai khaws cov thauv av los yog tso tsheb hlau luam nrog kev ua tshav ntuj ncaj qha. Tsis tas li ntawd, GOST sau cia kom ntim khoom nrog cov khoom no nyob rau hauv ib daim nplooj, tsis pub kom muaj kev cuam tshuam ntawm kev ntxhov siab atmospheric rau nws.

Urea-formaldehyde resin: manufacturers thiab hom

Rau hnub no nyob rau hauv Russia nws yog ua txog 500 txhiab tons ntawm CFS ib xyoos twg. Cov tuam txhab kev koom tes hauv cov koom txoos no yog:

• Yugorsky lespromholding;

• Shatura;

• Cherepovets thiab Povolzhsky plywood thiab rooj tog nroj tsuag;

Tsis tas li, peb tau koom nrog cov khoom siv xws li carbamide-formaldehyde resin, cov Lavxias teb sab-Finnish cov producers hauv peb lub teb chaws. Tshwj xeeb nyob rau hauv cov khoom ntawm no cov ntaub ntawv, piv txwv li, CJSC "Metadineya" thiab lub tuam txhab Kronostar-Vostok, ib feem ntawm cov European kev txhawj xeeb Swiss Krono Group. Tsis tas li ntawd, tus CFS yog ib qho ntawm ntau cov khoom uas tau ua los ntawm kev lag luam xws li Giants ntawm cov tshuaj ua lag luam li Acron thiab Metafax.