Ti o ba ti gbọ ti ọrọ naa “PCB ti ko ni halogen”Ati pe o fẹ lati ni imọ siwaju sii, o ti wa si aye ti o tọ. A pin itan naa lẹhin igbimọ Circuit ti a tẹjade.

Wa awọn otitọ nipa halogens ni PCB, halogens ni apapọ ati awọn ibeere fun ọrọ “halogen-free”. A tun wo awọn anfani ti halogen-ọfẹ.

Kini PCB ti ko ni halogen?

In order to meet the requirements of a halogen-free PCB, the board must contain no more than a certain amount of halogens in parts per million (PPM).

Halogens ni biphenyl polychlorinated

Halogens have a variety of uses in relation to PCBS.

Chlorine is used as a flame retardant or protective coating for polyvinyl chloride (PVC) wires. O tun lo bi epo fun idagbasoke semikondokito tabi fifọ awọn eerun kọnputa.

Bromine le ṣee lo bi imukuro ina lati daabobo awọn paati itanna tabi lati sọ di irin.

Ipele wo ni a ka si halogen-ọfẹ?

The International Electrochemistry Commission (IEC) sets the standard at 1,500 PPM for total halogen content by limiting halogen use. Awọn opin fun chlorine ati bromine jẹ 900 PPM.

Awọn opin PPM jẹ kanna ti o ba ni ibamu pẹlu opin Nkan eewu (RoHS).

Please note that various halogen standards exist on the market. Niwọn igba ti iṣelọpọ halogen kii ṣe ibeere labẹ ofin, awọn ipele iyọọda ti a ṣeto nipasẹ awọn nkan ominira, gẹgẹbi awọn aṣelọpọ, le yatọ.

Halogen-free board design

Ni aaye yii, o yẹ ki a ṣe akiyesi pe PCBS ti ko ni halogen ni o ṣoro lati wa. Awọn halogens kekere le wa lori awọn igbimọ Circuit, ati pe awọn akopọ wọnyi le farapamọ ni awọn aye airotẹlẹ.

Jẹ ki a ṣe alaye lori diẹ ninu awọn apẹẹrẹ. Igbimọ Circuit alawọ ewe ko ni halogen ayafi ti a ti yọ sobusitireti alawọ ewe kuro ni fiimu alaja.

Epoxy resins that help protect PCBS may contain chlorine. Halogens tun le farapamọ ninu awọn eroja bii gels gilasi, ọrinrin ati awọn aṣoju itọju, ati awọn olupolowo resini.

You should also be aware of the potential pitfalls of using halogen-free materials. Fun apẹẹrẹ, ni isansa ti awọn halogens, alaja si ipin ṣiṣan le ni ipa, eyiti o fa awọn eegun.

Ranti pe iru awọn iṣoro bẹẹ ko ni lati bori. Ọna ti o rọrun lati yago fun awọn fifẹ ni lati lo atako alatako (ti a tun mọ ni ataja tita) lati ṣalaye awọn paadi.

O ṣe pataki lati ṣe ifowosowopo pẹlu awọn aṣelọpọ PCB olokiki lati rii daju akoyawo ti akoonu halogen ninu PCB. Despite their recognition, not every manufacturer currently has the capacity to produce these boards.

Sibẹsibẹ, ni bayi ti o mọ ibiti awọn halogens wa ati kini wọn wa fun, o le ṣalaye awọn ibeere. O le nilo lati ṣiṣẹ ni pẹkipẹki pẹlu olupese lati pinnu ọna ti o dara julọ lati yago fun halogens ti ko wulo.

Botilẹjẹpe gbigba PCB ti ko ni halogen 100% le jẹ ipenija, o tun le ṣelọpọ PCB si ipele itẹwọgba ni ibamu pẹlu IEC ati awọn ilana RoHS.

Kini awọn halogens?

Halogens kii ṣe awọn kemikali funrararẹ tabi awọn nkan. Oro naa tumọ lati Giriki si “oluranlowo ṣiṣe iyọ” ati tọka si lẹsẹsẹ awọn eroja ti o ni ibatan ninu tabili igbakọọkan.

Iwọnyi pẹlu chlorine, bromine, iodine, fluorine ati A – diẹ ninu eyiti o le faramọ pẹlu. Otitọ igbadun: Darapọ pẹlu iṣuu soda ati halogens lati ṣe iyọ! Ni afikun, ipin kọọkan ni awọn abuda alailẹgbẹ ti o wulo fun wa.

Iodine is a common disinfectant. Awọn agbo ogun fluoride bii fluoride ni a ṣafikun si awọn ipese omi gbogbogbo lati ṣe igbelaruge ilera ehín, ati pe wọn tun rii ninu awọn lubricants ati awọn firiji.

Laanu pupọ, a ko loye iseda rẹ, ati pe Tennessee Tinge tun jẹ ikẹkọ.

Chlorine and bromine are found in everything from water disinfectors to pesticides and, of course, PCBS.

Why create halogen-free PCBS?

Although halogens play a vital role in PCB structures, they have a disadvantage that is hard to ignore: toxicity. Yes, these substances are functional flame retardants and fungicides, but they cost a lot.

Chlorine and bromine are the main culprits here. Ifihan si eyikeyi ninu awọn kemikali wọnyi le fa awọn aami aiṣan ti aibalẹ, gẹgẹbi inu rirun, iwúkọẹjẹ, hihun ara ati iran ti ko dara.

Mimu PCBS ti o ni awọn halogens jẹ ko ṣeeṣe lati ja si ifihan ti o lewu. Still, if the PCB catches fire and emits smoke, you can expect these adverse side effects.

If chlorine happens to mix with hydrocarbons, it produces dioxins, a deadly carcinogen. Unfortunately, due to the limited resources available to safely recycle PCBS, some countries tend to perform poor disposal.

Nitorinaa, didanu aibojumu ti PCBS pẹlu akoonu chlorine giga jẹ eewu si ilolupo eda. Burning these gadgets to eliminate them (which does happen) can release dioxins into the environment.

Benefits of using halogen-free PCBS

Ni bayi ti o ti mọ awọn otitọ, kilode ti o lo PCB ti ko ni halogen?

The main advantage is that they are less toxic alternatives to halogen filled alternatives. Pataki aabo rẹ, awọn onimọ -ẹrọ rẹ, ati awọn eniyan ti yoo mu awọn igbimọ lọ to lati ronu nipa lilo igbimọ kan.

In addition, the environmental risks are much lower than for equipment that contains large amounts of such hazardous chemicals. Paapa ni awọn agbegbe nibiti awọn iṣe atunlo PCB ti o dara julọ ko si, akoonu halogen kekere ṣe idaniloju didanu ailewu.

In an age of booming technology, where consumers are becoming increasingly aware of toxins in their products, the applications are almost limitless — ideally, halogen-free for the electronics in cars, mobile phones and other devices we keep in close touch with.

Ṣugbọn idinku majele kii ṣe anfani nikan: wọn tun ni anfani iṣẹ. Awọn PCBS wọnyi le kọju nigbagbogbo awọn iwọn otutu giga, ṣiṣe wọn ni apẹrẹ fun awọn iyika ti ko ni olori. Niwọn igba ti asiwaju jẹ idapọ miiran ti ọpọlọpọ awọn ile -iṣẹ gbiyanju lati yago fun, o le pa awọn ẹiyẹ meji pẹlu apata.

Idabobo PCB ti ko ni Halogen le jẹ idiyele-doko ati doko fun ẹrọ itanna isọnu. Lakotan, nitori awọn igbimọ wọnyi ṣe atagba ibawọn aisi -itanna kekere, o rọrun lati ṣetọju iduroṣinṣin ifihan.

Gbogbo wa yẹ ki o tiraka lati ni imọ -jinlẹ lati ṣe idinwo awọn eewu eewu ni awọn ohun elo to ṣe pataki bii PCBS. Botilẹjẹpe PCBS ti ko ni halogen ko ti ni ofin nipasẹ ofin, awọn akitiyan n ṣe ni iduro fun awọn ẹgbẹ ti o ni ifiyesi lati fagile lilo awọn agbo ogun ipalara wọnyi.