Kouch poud thermosetting refere a itilizasyon résine thermosetting kòm yon sibstans ki fòme fim -, ak adisyon nan yon ajan geri pou kwa-reyaksyon ki lye ka fòme yon kouch difisil ensolubl ak enfuzibl apre chofaj. Nan pi wo tanperati, kouch la pa pral adousi tankou yon kouch tèrmoplastik, men li pral sèlman dekonpoze. Depi résine yo itilize nan kouch poud thermosetting la se yon prepolymer ki gen yon degre pi ba nan polimerizasyon ak yon pwa molekilè ki pi ba, kouch la gen pi bon nivelman ak pi bon dekorasyon, ak prepolymer ki ba pwa molekilè geri. Li ka fòme rezo-tankou makromolekil kwa-, kidonk kouch la gen pi bon rezistans korozyon ak pwopriyete mekanik. Se poutèt sa, devlopman nan kouch poud thermosetting se patikilyèman rapid.
Osi lwen ke mache aktyèl la konsène, kouch poud thermosetting yo sitou divize an kategori sa yo dapre fim yo -fòme sibstans ak anviwònman itilizasyon:
1.1 Kouch poud epoksidik
Paske nan adezyon ekselan li yo nan metal, rezistans korozyon, dite, fleksibilite ak fòs enpak, li se premye varyete yo itilize nan kouch poud thermosetting.
Se fòmilasyon nan kouch epoksidik poud ki konpoze de résine epoksidik (rezin epoksidik), ajan geri (ajan geri), pigman (pigman), filler (filler) ak lòt asistan (asistan). Kontribisyon yo nan eleman sa yo nan pwopriyete yo nan kouch poud ki te fòme yo mityèlman restriksyon ak enfliyanse. Yon fòmilasyon apwopriye se aktyèlman rezilta kowòdinasyon divès eleman.
1.2 Polyester poud kouch
Kouch poud Polyester gen pwopriyete inik konpare ak lòt kalite kouch poud. Li pi bon pase 2 résine epoksidik an tèm de rezistans move tan ak rezistans UV. Anplis de sa, paske résine polyester gen gwoup polè, pousantaj poud la pi wo pase sa yo ki nan résine epoksidik, li pa fasil jòn pandan pwosesis la boulanjri, gen gwo enteprete, bon nivelman, fim penti plen ak koulè limyè, elatriye Trè dekoratif. . Anjeneral yo itilize nan frijidè, machin lave, aspiratè, lojman enstriman, bisiklèt, mèb ak lòt jaden. Kouch poud polyestè komen yo divize an TGIC move tan-revti poud ki reziste ak epoksidik-revti poud Polyester.
1.3 Acrylic kouch poud
Kouch poud résine Acrylic yo disponib nan tèrmoplastik ak tèrmoset. Avantaj nan pi gwo nan kouch poud résine Acrylic thermosetting se ke li gen ekselan rezistans move tan, retansyon koulè, rezistans polisyon, adezyon metal fò, ak aparans fim ekselan, ki se apwopriye pou kouch poud dekoratif.
2. Thermoplastik
Kouch poud tèmoplastik, ki te alantou depi 1950, fonn nan tanperati a flite ak solidifye nan yon fim lè refwadi. Akòz pwosesis senp ak metòd flite, kouch poud sèlman bezwen chofe, fonn, nivelman, refwadi oswa ekstrè solidifye nan yon fim, epi pa gen okenn aparèy geri konplike ki nesesè. Pifò nan matyè premyè yo itilize yo se polymère komen sou mache a, ki ka satisfè kondisyon pèfòmans yo nan pifò kondisyon yo. Sepandan, gen kèk defisyans, tankou tanperati k ap fonn segondè, nivo koloran ki ba, ak adezyon pòv sou sifas metal yo. Men, souvan itilize kouch thermoplastic poud toujou montre kèk pwopriyete inik, nan mitan ki kouch poud polyolefin gen ekselan rezistans sòlvan; kouch fliyò polivinilidèn gen rezistans move tan eksepsyonèl; poliamid gen ekselan rezistans abrasion; Klori vinil gen yon bon rapò pri / pèfòmans; thermoplastique polyestè poud revêtements gen avantaj bèl aparans ak atis anwo nan syèl la. Pwopriyete sa yo bay kouch poud thermoplastic yon gwo pati nan mache a kouch.
(1) Poud klori polyvinyl se youn nan pi bon mache polymère pou pwodiksyon an mas endistriyèl. Li gen ekselan rezistans sòlvan, bon rezistans korozyon nan dlo ak asid, rezistans enpak, rezistans espre sèl, anpeche kontaminasyon manje epi li gen gwo fòs dyelèktrik pou flite elektwostatik. Sitou itilize pou kouvri panno may metal, mèb asye, ekipman chimik, elatriye.
(2) Kouch poud polyethylene gen ekselan rezistans korozyon, rezistans chimik ak ekselan izolasyon elektrik ak rezistans radyasyon iltravyolèt. Dezavantaj la se ke fòs mekanik la pa wo epi adezyon an nan substra a se pòv. Li ka itilize nan tank chimik, roue, ponp, mi anndan tiyo, kokiy enstriman, fèy metal, frijidè panno may enteryè, pati oto, elatriye.
(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) Kouch poud an latèks. Poud an latèks prepare pa espre-seche emulsyon an, pi fò nan yo se copolymers acetate vinil. Penti a ki pwodui ak poud an latèks yo rele kouch an latèks poud. Li se penti ki pi zanmitay anviwònman an nan penti miray aktyèl la.
