Thermosetting hmoov txheej yog hais txog kev siv cov thermosetting resin ua ib zaj duab xis- tsim cov tshuaj, thiab ntxiv cov tshuaj tua kab mob rau tus ntoo khaub lig- cov tshuaj tiv thaiv sib txuas tuaj yeem tsim cov txheej txheem tsis yooj yim thiab infusible tom qab cua sov. Thaum kub siab dua, cov txheej yuav tsis muag zoo li cov txheej txheem thermoplastic, tab sis tsuas yog decompose. Txij li cov resin siv nyob rau hauv lub thermosetting hmoov txheej yog ib tug prepolymer nrog ib tug tsawg degree ntawm polymerization thiab ib tug qis molecular luj, lub txheej muaj zoo leveling thiab zoo dua kho kom zoo nkauj, thiab cov uas tsis muaj molecular hnyav prepolymer yog kho. Nws tuaj yeem tsim cov network-xws li ntoo khaub lig- txuas macromolecules, yog li cov txheej txheem muaj kev tiv thaiv corrosion zoo dua thiab cov khoom siv kho tshuab. Yog li ntawd, txoj kev loj hlob ntawm thermosetting hmoov txheej yog tshwj xeeb yog ceev.
Raws li kev lag luam tam sim no muaj kev txhawj xeeb, thermosetting hmoov txheej feem ntau muab faib ua pawg hauv qab no raws li lawv cov yeeb yaj kiab- tsim cov tshuaj thiab siv ib puag ncig:
1.1 Epoxy hmoov txheej
Vim nws zoo heev adhesion rau hlau, corrosion kuj, hardness, saj zawg zog thiab cuam tshuam lub zog, nws yog thawj ntau yam siv nyob rau hauv thermosetting hmoov txheej.
Lub formulation ntawm epoxy hmoov txheej yog tsim los ntawm epoxy resin (Epoxy Resin), curing agent (curing agent), pigment (pigment), muab tub lim (filler) thiab lwm tus neeg pab (pab). Kev koom tes ntawm cov khoom no rau cov khoom ntawm cov hmoov txheej tsim yog kev sib koom ua ke thiab cuam tshuam. Lub formulation tsim nyog yog qhov tshwm sim ntawm kev sib koom tes ntawm ntau yam khoom.
1.2 Polyester hmoov txheej
Polyester hmoov txheej muaj cov khoom tshwj xeeb piv rau lwm hom hmoov txheej. Nws yog qhov zoo dua li 2 epoxy resin raws li huab cua tsis kam thiab UV tsis kam. Tsis tas li ntawd, vim polyester resin muaj pawg polar, cov hmoov hmoov yog siab dua li ntawm epoxy resin, nws tsis yooj yim rau daj thaum lub sij hawm ci, muaj gloss siab, zoo leveling, tag nrho cov xim zaj duab xis thiab lub teeb xim, thiab lwm yam zoo nkauj heev. . Feem ntau siv rau hauv tub yees, tshuab ntxhua khaub ncaws, tshuab nqus tsev, ntsuas vaj tse, tsheb kauj vab, rooj tog thiab lwm yam. Feem ntau polyester resin hmoov txheej yog muab faib ua TGIC huab cua-cov hmoov txheej tiv taus thiab epoxy-polyester hmoov txheej.
1.3 Acrylic hmoov txheej
Acrylic resin hmoov txheej yog muaj nyob rau hauv thermoplastic thiab thermoset. Qhov zoo tshaj plaws ntawm thermosetting acrylic resin hmoov txheej yog tias nws muaj huab cua zoo tiv thaiv, xim tuav, muaj kuab paug tsis kam, muaj zog hlau adhesion, thiab zoo heev zaj duab xis tsos, uas yog haum rau cov hniav hmoov txheej.
2. Thermoplastic
Thermoplastic hmoov txheej, uas tau nyob ib puag ncig txij li xyoo 1950, yaj ntawm qhov ntsuas kub thiab ua kom khov rau hauv zaj duab xis thaum txias. Vim txoj kev ua haujlwm yooj yim thiab txau, cov hmoov txheej tsuas yog yuav tsum tau rhaub, yaj, theem, txias lossis muab rho tawm kom khov rau hauv zaj duab xis, thiab tsis tas yuav siv cov cuab yeej kho kom yooj yim. Feem ntau ntawm cov khoom siv raw siv yog cov khoom siv polymers hauv kev ua lag luam, uas tuaj yeem ua tau raws li qhov yuav tsum tau ua nyob rau hauv feem ntau cov xwm txheej. Txawm li cas los xij, muaj qee qhov tsis zoo, xws li kub melting kub, qis xim xim, thiab tsis zoo adhesion rau hlau nto. Txawm li cas los xij, feem ntau siv cov hmoov txheej thermoplastic tseem muaj qee yam khoom tshwj xeeb, ntawm cov polyolefin hmoov txheej muaj cov kuab tshuaj zoo heev; polyvinylidene fluoride txheej muaj cov huab cua tsis zoo; polyamides muaj kev tiv thaiv zoo heev; Vinyl chloride muaj tus nqi zoo / kev ua tau zoo; thermoplastic polyester hmoov txheej muaj qhov zoo ntawm cov tsos zoo nkauj thiab kev ua haujlwm siab. Cov khoom no muab cov khoom siv thermoplastic hmoov coatings ib feem loj ntawm kev ua lag luam coatings.
(1) Polyvinyl chloride hmoov yog ib qho ntawm cov polymers pheej yig tshaj plaws rau kev lag luam loj. Nws muaj cov kuab tshuaj zoo heev, zoo corrosion tsis kam rau dej thiab kua qaub, cuam tshuam tsis kam, ntsev tsuag tsis kam, tiv thaiv cov khoom noj thiab muaj zog dielectric siab rau electrostatic txau. Feem ntau yog siv rau txheej hlau mesh panels, steel rooj tog, khoom siv tshuaj, thiab lwm yam.
(2) Polyethylene hmoov txheej muaj corrosion kuj zoo heev, tshuaj tiv thaiv thiab hluav taws xob rwb thaiv tsev zoo heev thiab ultraviolet hluav taws xob tsis kam. Qhov tsis zoo yog tias lub zog txhua yam tsis siab thiab qhov adhesion rau lub substrate tsis zoo. Nws tuaj yeem siv rau hauv cov tshuaj tso tsheb hlau luam, impellers, twj tso kua mis, sab hauv phab ntsa ntawm cov kav dej, cov khoom siv plhaub, cov ntawv hlau, cov tub yees sab hauv mesh panels, nws pib qhov chaw, thiab lwm yam.
(3) Nylon powder coating. Nylon is also known as polyamide. Because the N atom of the chlorine group on the molecular chain and the hydrogen atom on the adjacent segment are easy to form hydrogen bonds, the melting point of polyamide resin is generally higher. Nylon has the advantages of high mechanical strength, impact resistance, hardness, wear resistance, small friction coefficient, low dust absorption, etc., and can be used for parts with special requirements. Such as pump impellers, textile machinery parts, starting piston parts of diesel engines, sailboat propellers, car wheels, motorcycle brackets, agricultural machinery, construction and sports equipment, etc. In addition, due to nylon's resistance to salt water and inertness to mold and bacteria, it is very suitable for making coatings immersed in seawater or in contact with seawater. At the same time, nylon powder coatings are non-toxic, tasteless, not eroded by mold, and will not promote bacterial growth. Suitable for spraying food industry parts, drinking water pipes and food packaging, etc.
(4) Fluorine resin powder coating. There are many types of fluoropolymers that can be used to prepare powder coatings, such as polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PTFCE), and polyvinylidene fluoride (PVDF). The melting point of PTFE is as high as 327 degree , and it can be used for a long time in the range of -250 to 250 degree . In addition, it has excellent corrosion resistance, not even in aqua regia, excellent dielectric properties, extremely low friction coefficient and Self-lubricating, so it is known as the "Plastic King". It is widely used in petroleum and chemical anti-corrosion coatings, seals, bearing lubricating materials, electronic and electrical materials, ship launching rails and non-stick pan coatings. The price of polychlorotrifluoroethylene is cheaper than that of PTFE, the processing temperature can be reduced, the coating can be used for a long time below 130 degree , the corrosion resistance of alkali and hydrogen fluoride is better than that of acid-resistant enamel, and the corrosion resistance of hydrochloric acid, dilute sulfuric acid, hydrogen chloride and chlorine gas. Better than stainless steel equipment. It has been widely used in anti-corrosion equipment in chemical factories, pesticide factories, pharmaceutical factories, detergent factories, etc. The biggest advantage of polyvinylidene fluoride powder coating is that it has excellent weather resistance, high degradation resistance in outdoor exposure, and does not absorb dust, so it is easy to maintain the original gloss. 5 Chlorinated polyether powder coating. Chlorinated polyether has excellent chemical stability. The coating film has good anti-corrosion and anti-dissolution properties to various acids, alkalis and solvents. Its chemical stability is second only to PTFE, and its mechanical and friction properties are also very good. Chlorinated polyether powder coatings are mainly used in chemical equipment, pipeline linings, instrument equipment shells, etc. The disadvantage is poor adhesion to metal. Adhesion to metals can be improved by adding additives.
(5) Latex hmoov txheej. Latex hmoov yog npaj los ntawm cov tshuaj tsuag - ziab cov emulsion, feem ntau yog cov yas acetate copolymer. Cov xim uas ua los ntawm cov hmoov latex yog hu ua latex hmoov txheej. Nws yog cov xim zoo nkauj tshaj plaws hauv cov xim phab ntsa tam sim no.
