Tom ntej: 1,4-Cyclohexanedicarboxylic Acid CAS 1076-97-7

CHDA yog ib qho tseem ceeb tshaj plaws monomers rau hmoov txheej polyester resin thoob ntiaj teb, nrog rau tus nqi noj txog li 40% -50%. Lub ntiaj teb hmoov txheej lag luam yuav tsum ncav cuag qhov loj ntawm kwv yees li 15 billion US las hauv 2023, nrog rau kev loj hlob txhua xyoo ntawm 6-8%. Nws qhov kom zoo dua ntawm xoom VOC emissions txuas ntxiv nthuav dav nyob rau hauv ob lub tsav ntawm EU's Solvent Emissions Directive thiab Tuam Tshoj "14th Tsib Xyoo Plan" VOCs tswj kev ntsuas. Cov kev sib tw tseem ceeb ntawm CHDA raws li polyester hmoov txheej yog nyob rau hauv lawv cov huab cua sab nraum zoov.

Tsoos PTA raws li polyester hmoov dhau los ntawm photooxidation ntawm lub nplhaib benzene nyob rau hauv ultraviolet lub teeb, ua rau cov hmoov txheej, yellowing, thiab poob gloss, nrog rau sab nraum zoov kev pab lub neej tsuas yog 5-8 xyoo. Cyclic qauv ntawm CHDA fundamentally tshem tawm cov tiam txoj kev ntawm chromophores - tsis muaj ntxhiab rings, yuav tsis muaj tiam ntawm quinone chromophores. Cov ntaub ntawv xeem tiag tiag qhia tau hais tias tom qab 3000 teev ntawm kev tawm sab nraum zoov hauv Florida, CHDA raws cov hmoov txheej muaj Δ E xim sib txawv tus nqi tsawg dua 1.5, thaum PTA raws li txheej txheej muaj Δ E tus nqi tshaj 5.0 nyob rau tib lub sijhawm.

Cov ntawv thov tshwj xeeb suav nrog: hmoov txheej ntawm aluminium alloy rau tsheb log hubs (tiv taus rau pob zeb cuam tshuam thiab ntsev tsuag rau ntau tshaj 1000h), txheej txheej xim thiab yob rau cov phab ntsa sab nrauv ntawm lub tsev (sab nraum zoov 20 xyoo lub teeb thiab xim tuav), cov khoom siv hauv tsev (tiv thaiv cov ntiv tes thiab tshuaj ntxuav tes), cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob.

Yob txheej yog cov txheej txheem tseem ceeb rau kev kho saum npoo ntawm lub tsev hlau, nrog rau txhua xyoo kev noj haus thoob ntiaj teb ntau dua 2 lab tons. Sab nrauv phab ntsa xim panels ntawm lub tsev yuav tsum tau 15-25 xyoo tsis fading, tsis hmoov, thiab tsis tawg, uas tso tsis tshua muaj neeg xav tau ob qho kev xav tau ntawm huab cua tsis kam thiab yooj ntawm cov resin.

CHDA raws li polyester resin deb tshaj li 3T-4T tus qauv ntawm PTA raws li resin nyob rau hauv cov nqe lus ntawm T- dabtsi yog khoov kev ua tau zoo (tsis muaj cracking thaum khoov rau 1T), thaum lub lipid nplhaib qauv xyuas kom meej UV stability. Tam sim no, yuav luag 100% ntawm high-end sab nraum zoov coil txheej thoob ntiaj teb siv polyester tshuab hloov nrog CHDA los yog nws cov derivatives. AkzoNobel PPG, Cov khoom lag luam tseem ceeb ntawm cov neeg loj xws li Nippon Xim yog txhua qhov chaw nyob ib puag ncig CHDA.

CHDA reacts with polyols such as neopentyl glycol and trimethylolpropane to produce polyester polyols, which are then acrylated to obtain UV curable resins with a curing speed of seconds. Applications include: wood coatings (high gloss>95 °, scratch resistant 3H pencil hardness), phone cases and electronic product cases (both hardness and flexibility), fiber optic coatings (light transmittance>99%, shrinkage<3%), and flexible packaging gravure ink (high-speed curing, low VOC). The global UV cured coating market is expected to reach approximately $8 billion in 2023, with an annual growth rate of 8-10%. CHDA based UV resin is the fastest-growing category among them.

1,4-cyclohexanedicarboxylic acid has better hydrolytic stability than aromatic acids or linear fatty acids in the synthesis of waterborne polyester resins. Research has shown that in waterborne polyurethane resins, the dispersion stability of CHDA is superior to that of phthalic acid (PIA) and adipic acid (AD), in the order of CHDA>PIA>AD. Lub caij no, CHDA tuaj yeem ua tiav qhov sib npaug zoo ntawm qhov tawv thiab qhov yooj yim ntawm cov resin, thiab tuaj yeem siv los txhim kho cov dispersibility thiab cia ruaj khov ntawm acrylic resin.

Pure PET resin is prone to yellowing due to thermal oxidation during processing (280 ° C melt) and use, which is a fatal flaw in the fields of transparent packaging and optical films. After CHDA is introduced into the PET main chain as a comonomer, the cycloaliphatic structure does not contain conjugated double bonds, making it difficult to generate quinone chromophores. At the same time, it reduces the density of aromatic rings in the molecular chain and decreases the number of photo oxidative active sites. Without sacrificing mechanical strength (tensile strength retention>95%), kev xa tawm tau nce mus rau ntau dua 92% (PET ntshiab yog li 88%).

CHDA raug txo mus rau 1,4-cyclohexanedimethanol (CHDM) los ntawm catalytic hydrogenation, thiab tom qab ntawd condensed nrog dimethyl terephthalate (DMT) los ua PCT (poly (1,4-cyclohexanedimethanol terephthalate), uas yog qhov tseem ceeb tshaj plaws hauv kev lag luam hauv nruab nrab ntawm PCT8, CHDA. Kev khiav hauj lwm tas mus li ntawm 130-150 ° C, flexural kub ntawm 243-260 ° C, thiab melting point ntawm 285 ° C. Nws muaj cov yam ntxwv xws li tshuaj tiv thaiv, tsis tshua muaj noo noo nqus, thiab lub zog txhua yam.