Xov Xwm

Kev loj hlob ntawmunsaturated polyester cobcov khoom muaj keeb kwm ntawm ntau tshaj 70 xyoo. Nyob rau lub sijhawm luv luv, cov khoom lag luam tsis muaj polyester resin tau tsim sai heev nyob rau hauv cov nqe lus ntawm cov zis thiab kev ua haujlwm. Txij li thaum yav tas los unsaturated polyester resin cov khoom tau tsim los ua ib qho ntawm ntau yam loj tshaj plaws hauv kev lag luam thermosetting resin. Thaum lub sij hawm txoj kev loj hlob ntawm unsaturated polyester resins, kev qhia txog cov khoom patents, lag luam ntawv xov xwm, technicalbooks, thiab lwm yam. emerges ib tug tom qab lwm. Txog tam sim no, muaj ntau pua qhov kev tsim tawm patents txhua xyoo, uas muaj feem xyuam rau cov khoom siv tsis zoo polyester. Nws tuaj yeem pom tias kev tsim khoom thiab kev siv thev naus laus zis ntawm unsaturated polyester resin tau dhau los ua neeg paub tab nrog kev tsim khoom, thiab tau maj mam tsim nws tus kheej tshwj xeeb thiab ua tiav cov txheej txheem ntawm kev tsim khoom thiab kev siv txoj kev xav. Nyob rau hauv txoj kev loj hlob dhau los, unsaturated polyester resins tau ua ib qho tshwj xeeb pab rau kev siv dav dav. Nyob rau hauv lub neej yav tom ntej, nws yuav txhim kho rau qee qhov chaw tshwj xeeb, thiab tib lub sijhawm, tus nqi ntawm cov khoom siv dav dav yuav raug txo. Cov hauv qab no yog qee qhov nthuav thiab pheej hmoo tsis txaus siab polyester resin hom, suav nrog: qis shrinkage resin, nplaim retardant resin, toughening resin, tsis tshua muaj styrene volatilization resin, corrosion-resistant resin, gel coat resin, lub teeb curing resin Unsaturated polyester resins, nqi qis resins. nrog cov khoom tshwj xeeb, thiab cov ntoo ntiv tes ua haujlwm siab ua ke nrog cov ntaub ntawv tshiab thiab cov txheej txheem.

1. Tsawg shrinkage resin

Qhov ntau yam resin no tsuas yog ib lub ntsiab lus qub. Unsaturated polyester resin yog nrog los ntawm ib tug loj shrinkage thaum lub sij hawm kho, thiab lub dav ntim shrinkage tus nqi yog 6-10%. Qhov shrinkage no tuaj yeem deform loj lossis tawg cov khoom, tsis yog hauv cov txheej txheem compression molding (SMC, BMC). Txhawm rau kov yeej qhov tsis txaus no, cov thermoplastic resins feem ntau yog siv los ua cov khoom qis qis. Daim ntawv patent hauv cheeb tsam no tau muab rau DuPont xyoo 1934, tus lej patent US 1.945,307. Daim ntawv patent piav qhia txog copolymerization ntawm dibasic antelopelic acids nrog vinyl compounds. Kom meej meej, thaum lub sij hawm, qhov no patent pioneered qis shrinkage technology rau polyester resins. Txij thaum ntawd los, ntau tus neeg tau mob siab rau lawv tus kheej rau txoj kev kawm ntawm copolymer systems, uas tau raug suav hais tias yog cov yas alloys. Nyob rau hauv 1966 Marco tus qis shrinkage resins tau xub siv nyob rau hauv molding thiab industrial ntau lawm.

Plastics Industry Association tom qab hu cov khoom no "SMC", uas txhais tau hais tias daim ntawv molding compound, thiab nws low-shrinkage premix compound "BMC" txhais tau tias tej molding compound. Rau SMC cov nplooj ntawv, nws yog feem ntau yuav tsum tau cov resin-moulded qhov chaw muaj qhov haum haum, yoog raws thiab A-qib gloss, thiab micro-cracks ntawm qhov chaw yuav tsum tau zam, uas yuav tsum tau muab cov khoom sib txuam kom muaj qhov qis qis. Tau kawg, ntau cov patents txij li thaum txhim kho thiab txhim kho cov thev naus laus zis no, thiab kev nkag siab ntawm cov txheej txheem ntawm cov nyhuv qis qis tau maj mam matured, thiab ntau yam tsawg-shrinkage agents lossis low-profile additives tau tshwm sim raws li lub sijhawm xav tau. Feem ntau siv qis shrinkage additives yog polystyrene, polymethyl methacrylate thiab lwm yam.

drtgf (1) 2. nplaim retardant resin

Qee zaum cov khoom siv hluav taws xob hluav taws xob tseem ceeb xws li kev cawm cov tshuaj, thiab cov khoom siv hluav taws xob hluav taws xob tuaj yeem zam lossis txo qhov tshwm sim ntawm kev puas tsuaj. Hauv Tebchaws Europe, tus naj npawb ntawm cov hluav taws tuag tau txo qis li ntawm 20% hauv kaum xyoo dhau los vim yog siv cov nplaim hluav taws. Kev nyab xeeb ntawm cov khoom siv hluav taws xob hluav taws xob nws tus kheej kuj tseem ceeb heev. Nws yog txheej txheem qeeb thiab nyuaj rau kev ua qauv ntawm cov khoom siv hauv kev lag luam. Tam sim no, European Community muaj thiab tab tom ua kev soj ntsuam kev phom sij ntawm ntau yam halogen-raws li thiab halogen-phosphorus nplaim taws retardants. , ntau yam uas yuav ua tiav ntawm 2004 thiab 2006. Tam sim no, peb lub teb chaws feem ntau siv cov tshuaj chlorine-muaj los yog bromine-muaj diols los yog dibasic acid halogen hloov ua raw khoom los npaj reactive nplaim retardant resins. Halogen nplaim taws retardants yuav tsim ntau cov pa luam yeeb thaum hlawv, thiab nrog rau cov tiam ntawm heev irritating hydrogen halide. Cov pa luam yeeb hnyav thiab cov pa phem uas tsim tawm thaum lub sij hawm combustion ua rau muaj kev puas tsuaj loj rau tib neeg.

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Ntau tshaj 80% ntawm hluav taws kub sib tsoo yog tshwm sim los ntawm qhov no. Lwm qhov tsis zoo ntawm kev siv bromine los yog hydrogen-raws li nplaim hluav taws yog qhov corrosive thiab ib puag ncig-polluting gases yuav raug tsim thaum lawv raug hlawv, uas yuav ua rau puas tsuaj rau cov khoom hluav taws xob. Kev siv cov nplaim hluav taws tsis zoo xws li hydrated alumina, magnesium, canopy, molybdenum tebchaw thiab lwm cov nplaim hluav taws kub hnyiab tau tuaj yeem tsim cov pa taws tsawg thiab cov nplaim hluav taws kub tsis zoo, txawm hais tias lawv muaj kev cuam tshuam cov pa luam yeeb. Txawm li cas los xij, yog tias tus nqi ntawm cov nplaim hluav taws xob tsis zoo yog qhov loj heev, tsis yog tsuas yog cov viscosity ntawm cov resin nce, uas tsis tsim nyog rau kev tsim kho, tab sis kuj yog thaum muaj ntau cov nplaim hluav taws xob ntxiv rau cov resin, nws yuav cuam tshuam. mechanical zog thiab hluav taws xob khoom ntawm cov resin tom qab kho.

Tam sim no, ntau tus neeg txawv teb chaws patents tau tshaj tawm cov thev naus laus zis ntawm kev siv phosphorus-raws li cov nplaim hluav taws kub hnyiab los tsim cov tshuaj lom neeg tsawg thiab cov pa taws tsawg tsawg. Phosphorus-based nplaim retardants muaj cov nplaim hluav taws kub heev. Cov metaphosphoric acid generated thaum lub sij hawm combustion yuav ua tau polymerized rau hauv ib tug ruaj khov polymer lub xeev, tsim ib tug tiv thaiv txheej, npog lub nto ntawm lub combustion khoom, cais oxygen, txhawb lub cev qhuav dej thiab carbonization ntawm resin nto, thiab tsim ib tug carbonized tiv thaiv zaj duab xis. Li no tiv thaiv combustion thiab nyob rau tib lub sij hawm phosphorus-raws li nplaim retardants kuj siv tau ua ke nrog halogen nplaim retardants, uas muaj ib tug heev pom tseeb synergistic nyhuv. Tau kawg, kev tshawb fawb yav tom ntej ntawm cov nplaim hluav taws kub nyhiab yog cov pa luam yeeb tsawg, tsis muaj tshuaj lom thiab tsis muaj nqi. Cov resin zoo tshaj plaws yog tsis muaj pa luam yeeb, tsis muaj tshuaj lom, tsis tshua muaj nqi, tsis cuam tshuam rau cov resin, muaj cov khoom siv hauv lub cev, tsis tas yuav ntxiv cov khoom siv ntxiv, thiab tuaj yeem tsim ncaj qha rau hauv cov khoom siv cob.

3. Toughening resin

Piv nrog rau cov thawj unsaturated polyester resin ntau yam, tam sim no resin toughness tau zoo heev. Txawm li cas los xij, nrog rau txoj kev loj hlob ntawm kev lag luam downstream ntawm unsaturated polyester resin, ntau cov kev xav tau tshiab tau muab tso rau pem hauv ntej rau kev ua haujlwm ntawm unsaturated resin, tshwj xeeb tshaj yog nyob rau hauv cov nqe lus ntawm toughness. Lub brittleness ntawm unsaturated resins tom qab kho tau yuav luag dhau los ua ib qho teeb meem tseem ceeb txwv txoj kev loj hlob ntawm unsaturated resins. Txawm hais tias nws yog cov khoom lag luam cam khwb cia-molded los yog cov khoom siv molded los yog qhov txhab, qhov elongation ntawm kev tawg dhau los ua qhov taw qhia tseem ceeb rau kev ntsuam xyuas cov khoom zoo.

Tam sim no, qee cov tuam txhab txawv teb chaws siv txoj hauv kev ntxiv saturated resin los txhim kho toughness. Xws li ntxiv saturated polyester, styrene-butadiene roj hmab thiab carboxy-terminated (suo-) styrene-butadiene roj hmab, thiab lwm yam, txoj kev no belongs rau lub cev toughening txoj kev. Nws kuj tseem tuaj yeem siv los qhia txog cov khoom thaiv polymers rau hauv cov saw tseem ceeb ntawm cov khoom siv tsis zoo polyester, xws li cov qauv sib txuas sib txuas tsim los ntawm cov khoom siv tsis zoo polyester thiab epoxy resin thiab polyurethane resin, uas zoo heev txhim kho lub zog tensile thiab cuam tshuam lub zog ntawm cov resin. , txoj kev toughening no belongs rau chemical toughening method. Kev sib xyaw ua ke ntawm lub cev tawv thiab cov tshuaj toughening tuaj yeem siv tau, xws li kev sib xyaw ua ke ntau dua tsis muaj zog polyester nrog cov khoom siv tsawg dua kom ua tiav qhov xav tau yooj yim.

Tam sim no, cov ntawv SMC tau siv dav hauv kev lag luam tsheb vim lawv lub teeb yuag, lub zog siab, tiv thaiv corrosion, thiab tsim kom yooj yim. Rau qhov tseem ceeb xws li automotive panels, rear qhov rooj, thiab cov vaj huam sib luag sab nrauv, yuav tsum muaj qhov zoo toughness, xws li automotive sab nrauv panels. Cov neeg saib xyuas tuaj yeem khoov rov qab mus rau qhov txwv thiab rov qab mus rau lawv qhov qub qub tom qab muaj kev cuam tshuam me ntsis. Ua kom lub zog ntawm cov resin feem ntau poob lwm yam khoom ntawm cov resin, xws li hardness, flexural zog, kub tsis kam, thiab curing ceev thaum lub sij hawm tsim kho. Kev txhim kho cov tawv tawv ntawm cov resin yam tsis tau poob lwm yam khoom muaj txiaj ntsig ntawm cov resin tau dhau los ua ib lub ntsiab lus tseem ceeb hauv kev tshawb fawb thiab kev loj hlob ntawm unsaturated polyester resins.

4.Low styrene volatile resin

Nyob rau hauv tus txheej txheem ntawm kev ua unsaturated polyester resin, volatile toxic styrene yuav ua rau muaj kev puas tsuaj loj rau kev noj qab haus huv ntawm cov neeg ua haujlwm tsim kho. Nyob rau tib lub sijhawm, styrene raug tso tawm rau hauv huab cua, uas tseem yuav ua rau huab cua phem heev. Yog li ntawd, ntau tus tub ceev xwm txwv qhov tso cai concentration ntawm styrene nyob rau hauv cov huab cua ntawm lub rhiav ntau lawm. Piv txwv li, nyob rau hauv lub tebchaws United States, nws cov permissible exposure theem (tso cai exposure theem) yog 50ppm, thaum nyob rau hauv Switzerland nws PEL tus nqi yog 25ppm, xws li cov ntsiab lus uas tsis yog yooj yim mus cuag. Kev cia siab rau qhov cua muaj zog kuj txwv. Nyob rau tib lub sijhawm, qhov cua muaj zog kuj tseem yuav ua rau poob ntawm styrene los ntawm qhov chaw ntawm cov khoom thiab cov volatilization ntawm ntau cov styrene rau hauv cov huab cua. Yog li ntawd, txhawm rau nrhiav txoj hauv kev los txo cov volatilization ntawm styrene, los ntawm cov hauv paus hniav, nws tseem yuav tsum tau ua kom tiav cov haujlwm no hauv cov nroj tsuag resin. Qhov no yuav tsum tau tsim cov styrene volatility (LSE) resins uas tsis muaj kuab paug los yog tsis muaj kuab paug rau huab cua, los yog unsaturated polyester resins tsis muaj styrene monomers.

Txo cov ntsiab lus ntawm volatile monomers yog ib lub ntsiab lus tsim los ntawm txawv teb chaws unsaturated polyester resin kev lag luam nyob rau hauv xyoo tas los. Muaj ntau txoj kev siv tam sim no: (1) cov txheej txheem ntawm kev ntxiv cov volatility inhibitors tsawg; (2) lub formulation ntawm unsaturated polyester resins tsis muaj styrene monomers siv divinyl, vinylmethylbenzene, α-methyl Styrene los hloov vinyl monomers uas muaj styrene monomers; (3) Lub formulation ntawm unsaturated polyester resins nrog tsawg styrene monomers yog siv cov saum toj no monomers thiab styrene monomers ua ke, xws li siv diallyl phthalate Kev siv high-boiling vinyl monomers xws li esters thiab acrylic copolymer nrog styrene monomers: (4) Lwm txoj kev los txo cov volatilization ntawm styrene yog ua kom paub lwm yam xws li dicyclopentadiene thiab nws cov derivatives rau hauv unsaturated polyesters Resin skeleton, kom ua tau tsawg viscosity, thiab thaum kawg txo cov ntsiab lus ntawm styrene monomer.

Nyob rau hauv kev nrhiav ib txoj hauv kev los daws qhov teeb meem ntawm styrene volatilization, nws yog ib qho tsim nyog yuav tsum tau ua tib zoo xav txog qhov siv tau ntawm cov resin rau cov txheej txheem molding uas twb muaj lawm xws li tshuaj tsuag nto, txheej txheem lamination, SMC molding txheej txheem, tus nqi ntawm cov khoom siv raw rau kev tsim khoom, thiab lub compatibility nrog resin system. , Resin reactivity, viscosity, mechanical zog ntawm resin tom qab molding, thiab lwm yam nyob rau hauv kuv lub teb chaws, tsis muaj ib tug meej txoj cai ntawm kev txwv tsis pub lub volatilization ntawm styrene. Txawm li cas los xij, nrog kev txhim kho ntawm tib neeg txoj kev ua neej nyob thiab kev txhim kho ntawm tib neeg kev paub txog lawv tus kheej kev noj qab haus huv thiab kev tiv thaiv ib puag ncig, nws tsuas yog lub sijhawm ua ntej cov kev cai lij choj tsim nyog rau cov neeg siv khoom tsis txaus ntseeg zoo li peb.

5. Corrosion-resistant resin

Ib qho ntawm kev siv ntau dua ntawm cov khoom siv tsis zoo polyester yog lawv cov corrosion kuj rau cov tshuaj xws li organic solvents, acids, bases, thiab ntsev. Raws li kev qhia ntawm unsaturated resin network kws txawj, tam sim no corrosion-resistant resins tau muab faib ua pawg hauv qab no: (1) o-benzene hom; (2) hom iso-benzene; (3) hom p-benzene; (4) bisphenol A hom; (5) Vinyl ester hom; thiab lwm yam xws li xylene hom, halogen-muaj cov compound hom, thiab lwm yam. Tom qab ntau xyoo ntawm kev tshawb nrhiav txuas ntxiv los ntawm ntau tiam neeg ntawm cov kws tshawb fawb, cov kev txhim kho ntawm cov resin thiab cov txheej txheem ntawm kev tiv thaiv corrosion tau raug tshawb fawb. Cov cob yog hloov kho los ntawm ntau txoj hauv kev, xws li qhia cov pob txha molecular uas nyuaj rau kev tiv thaiv corrosion rau hauv unsaturated polyester resin, los yog siv unsaturated polyester, vinyl ester thiab isocyanate los tsim ib qho kev sib txuas network, uas yog ib qho tseem ceeb heev rau kev txhim kho corrosion kuj. ntawm cov resin. Cov tshuaj tiv thaiv corrosion zoo heev, thiab cov resin tsim los ntawm txoj kev sib xyaw acid resin tuaj yeem ua tau zoo dua corrosion kuj.

Piv nrogepoxy cob,tus nqi qis thiab kev ua haujlwm yooj yim ntawm unsaturated polyester resins tau dhau los ua qhov zoo. Raws li cov kws tshaj lij uas tsis muaj qhov tsis txaus ntseeg, qhov kev tiv thaiv corrosion ntawm unsaturated polyester resin, tshwj xeeb tshaj yog cov alkali tsis kam, yog qhov qis dua ntawm epoxy resin. Tsis tuaj yeem hloov epoxy resin. Tam sim no, qhov nce ntawm cov plag tsev los tiv thaiv corrosion tau tsim cov cib fim thiab cov kev sib tw rau cov khoom siv tsis zoo polyester resins. Yog li ntawd, kev txhim kho tshwj xeeb los tiv thaiv corrosion resins muaj kev cia siab dav.

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6.Gel coat resin

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Gel coat plays lub luag haujlwm tseem ceeb hauv cov khoom sib xyaw. Nws tsis tsuas yog ua lub luag haujlwm zoo nkauj ntawm qhov chaw ntawm FRP cov khoom, tab sis kuj tseem ua lub luag haujlwm hauv kev hnav tsis kam, kev laus ua haujlwm thiab tshuaj tiv thaiv corrosion. Raws li cov kws tshaj lij los ntawm unsaturated resin network, txoj kev loj hlob ntawm gel coat resin yog los tsim cov gel coat resin nrog qis styrene volatilization, huab cua kom qhuav thiab muaj zog corrosion kuj. Muaj kev lag luam loj rau cov gel tsho tiv thaiv tshav kub hauv gel coat resins. Yog tias cov khoom siv FRP tau muab tso rau hauv dej kub rau lub sijhawm ntev, cov hlwv yuav tshwm rau ntawm qhov chaw. Nyob rau tib lub sijhawm, vim tias maj mam nkag mus rau hauv cov khoom siv sib xyaw, cov hlwv ntawm qhov chaw yuav maj mam nthuav. Cov hlwv yuav tsis tsuas cuam tshuam Cov tsos ntawm cov gel lub tsho yuav maj mam txo lub zog ntawm cov khoom.

Cook Composites thiab Polymers Co. ntawm Kansas, Tebchaws USA, siv epoxy thiab glycidyl ether-txiav txoj hauv kev los tsim cov gel coat resin nrog tsawg viscosity thiab dej zoo heev thiab hnyav ua haujlwm. Tsis tas li ntawd, lub tuam txhab kuj tseem siv cov polyether polyol-hloov thiab epoxy-terminated resin A (flexible resin) thiab dicyclopentadiene (DCPD)-hloov resin B (rigid resin) compound, ob qho tib si uas muaj tom qab compounding, cov resin nrog dej kuj tsis tuaj yeem. Tsuas yog muaj dej tsis kam, tab sis kuj muaj qhov zoo toughness thiab lub zog. Cov kuab tshuaj los yog lwm yam tshuaj uas tsis muaj molecular nkag mus rau hauv cov khoom siv FRP los ntawm txheej txheej gel, dhau los ua cov dej-resistant resin nrog cov khoom zoo heev.

7. Lub teeb curing unsaturated polyester cob

Lub teeb curing yam ntxwv ntawm unsaturated polyester cob yog lub neej ntev lauj kaub thiab ceev curing ceev. Unsaturated polyester resins tuaj yeem ua tau raws li qhov yuav tsum tau ua rau kev txwv tsis pub hloov pauv ntawm styrene los ntawm kev kho lub teeb. Vim yog kev nce qib ntawm cov duab hluav taws xob thiab cov khoom siv teeb pom kev zoo, lub hauv paus rau kev txhim kho cov duab thaij duab tau raug tso. Ntau yam UV-curable unsaturated polyester resins tau ua tiav thiab muab tso rau hauv ntau lawm. Cov khoom siv, cov txheej txheem kev ua tau zoo thiab qhov hnav tsis kam yog txhim kho, thiab kev ua haujlwm ntawm cov khoom siv kuj tseem txhim kho los ntawm kev siv cov txheej txheem no.

8.Cov nqi qis nrog cov khoom tshwj xeeb

Xws li cov resins muaj xws li foamed resins thiab aqueous resins. Tam sim no, qhov tsis tshua muaj zog ntawm ntoo muaj qhov nce siab hauv qhov ntau. Kuj tseem muaj kev tsis txaus ntawm cov neeg ua haujlwm txawj ua haujlwm hauv kev lag luam ntoo, thiab cov neeg ua haujlwm no tau txais nyiaj ntau ntxiv. Cov xwm txheej zoo li no tsim cov xwm txheej rau engineering plastics nkag mus rau hauv kev lag luam ntoo. Unsaturated foamed resins thiab dej-muaj resins yuav raug tsim los ua cov ntoo dag hauv kev lag luam rooj tog vim lawv cov nqi qis thiab cov khoom muaj zog. Daim ntawv thov yuav qeeb thaum pib, thiab tom qab ntawd nrog kev txhim kho txuas ntxiv ntawm kev ua cov thev naus laus zis, daim ntawv thov no yuav tsim tau sai.

Unsaturated polyester resins tuaj yeem ua foamed los ua foamed resins uas tuaj yeem siv los ua phab ntsa panels, ua ntej tsim chav dej faib, thiab ntau dua. Lub toughness thiab lub zog ntawm foamed yas nrog unsaturated polyester cob raws li cov matrix zoo dua li ntawm foamed PS; nws yooj yim dua rau txheej txheem dua li foamed PVC; tus nqi qis dua li ntawm cov yas foamed polyurethane, thiab qhov sib ntxiv ntawm cov nplaim hluav taws kuj tuaj yeem ua rau nws nplaim hluav taws thiab tiv thaiv kev laus. Txawm hais tias daim ntawv thov thev naus laus zis ntawm resin tau tsim tiav, daim ntawv thov ntawm foamed unsaturated polyester resin hauv rooj tog tsis tau them nyiaj ntau. Tom qab kev tshawb nrhiav, qee cov tuam txhab resin muaj kev txaus siab los tsim cov khoom tshiab no. Qee qhov teeb meem loj (skinning, honeycomb qauv, gel-foaming lub sij hawm kev sib raug zoo, exothermic nkhaus tswj tsis tau tag nrho cov kev daws teeb meem ua ntej coj mus muag khoom, kom txog rau thaum ib tug teb tau txais, cov resin no tsuas yog siv tau vim nws cov nqi qis hauv kev lag luam rooj tog. cov teeb meem no tau daws, cov resin no yuav siv dav hauv thaj chaw xws li cov khoom siv hluav taws xob ua npuas ncauj es tsis yog siv nws txoj kev lag luam xwb.

Cov dej uas tsis muaj cov polyester resins tuaj yeem muab faib ua ob hom: hom dej-soluble thiab hom emulsion. Raws li thaum ntxov xyoo 1960s txawv teb chaws, muaj patents thiab ntaub ntawv qhia nyob rau hauv cheeb tsam no. Cov dej uas muaj cov resin yog ntxiv cov dej los ua cov khoom siv ntawm cov khoom siv tsis zoo polyester rau cov resin ua ntej resin gel, thiab cov ntsiab lus dej tuaj yeem siab li 50%. Xws li cov resin hu ua WEP resin. Cov resin muaj cov yam ntxwv ntawm tus nqi qis, lub teeb yuag tom qab kho, nplaim hluav taws zoo retardancy thiab qis shrinkage. Txoj kev loj hlob thiab kev tshawb fawb ntawm cov dej uas muaj cov resin hauv kuv lub teb chaws tau pib thaum xyoo 1980, thiab nws tau siv sijhawm ntev heev. Nyob rau hauv cov nqe lus ntawm daim ntawv thov, nws tau siv raws li ib tug anchoring neeg sawv cev. Aqueous unsaturated polyester cob yog ib hom tshiab ntawm UPR. Cov cuab yeej siv hauv chav kuaj tau dhau los ua neeg paub tab, tab sis muaj kev tshawb fawb tsawg dua ntawm daim ntawv thov. Cov teeb meem uas yuav tsum tau daws ntxiv yog qhov ruaj khov ntawm cov emulsion, qee qhov teeb meem hauv cov txheej txheem kho thiab molding, thiab qhov teeb meem ntawm cov neeg siv khoom pom zoo. Feem ntau, 10,000-tuj unsaturated polyester resin tuaj yeem tsim txog 600 tons ntawm cov dej khib nyiab txhua xyoo. Yog hais tias lub shrinkage generated nyob rau hauv cov txheej txheem ntawm zus tau tej cov unsaturated polyester resin yog siv los tsim cov dej uas muaj resin, nws yuav txo tau tus nqi ntawm resin thiab daws qhov teeb meem ntawm kev tiv thaiv ib puag ncig.

Peb cuam tshuam rau hauv cov khoom nram qab no: unsaturated polyester resin;vinyl cob; gel tsho tiv no resin; epoxy cob.

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