Dị ka anyị niile maara, ọganihu na -aga n’ihu nke ngwa elektrọnik na teknụzụ sekit, ọnụ ọgụgụ kacha elu nke nka nka na imewe, mmepe na imepụta ya bọọdụ sekit biri ebi (PCB) agbaala ndị mmadụ gburugburu ụwa ama. Our planet is full of highly intelligent machines, automated robots and scientific marvels, and of course, there are plenty of PCBS in every corner of the planet, no matter what country or city it is. Agbanyeghị, PCBS ndị a dị iche n’ịrụ ọrụ, mgbagwoju anya, ọnụ ahịa nrụpụta, ogo na ntụkwasị obi. Edemede a lekwasịrị anya na isi ihe abụọ ikpeazụ, ogo na ntụkwasị obi nke PCBS.

Ee, ndị ahịa nwere ike na -achọ elektrọnikịịị dị elu, mana nke a dị oke ọnụ ma nwee ike itinye usoro nrụpụta dị mgbagwoju anya. N’ime usoro dị mgbagwoju anya nke nrụpụta PCB, mgbakọ na nnwale, enwere usoro dị oke mkpa a na -akpọ “mkpuchi mkpuchi” nke PCB. Mkpuchi mkpuchi a dị oke mkpa na PCBS n’ihe gbasara ịdị mma na ntụkwasị obi.

Kedu ihe bụ mkpuchi mkpuchi yana mkpa ya:

Conforming coating, an ultra-thin protective coating of polymer film, can be used in conjunction with assemblies mounted on assembly surfaces to protect assembly leads, solder joints, exposed wiring, and other metal points on the PCB surface from corrosion, dust, or chemicals due to various operating or environmental conditions.

Mkpuchi ihu ya nwere ike ịdị obere ka 25 microns wee “kwekọọ” n’ụdị na nhazi akụkụ nke bọọdụ sekit. Dịka ekwuru n’elu, ihe kpatara itinye mkpuchi ihu na ihu (elu na ala) nke PCB bụ iji chebe PCB pụọ na ọnọdụ gburugburu ebe obibi dị njọ, si otu a na -abawanye ndụ ọrụ nke PCB na ngwa elektrọnịkị jikọtara ya.

Dị ka oke ọkụ dị na ụlọ ọrụ mmepụta ihe, ụlọ ọrụ, na eletrọnịkị ike dị elu, PCBS ndị a nwere mkpuchi ihu nwere ike iguzogide oke okpomọkụ. N’otu aka ahụ, akụrụngwa elektrọnik arụnyere na mpaghara/mpaghara dị nso n’oké osimiri ma ọ bụ oke osimiri nwere ike imetụta oke iru mmiri, dị ka ịnya ụgbọ mmiri elektrọnik nwere ike bute nsị/mbuze nke nwere ike ibute ọzere igwe. Similarly, in microbiology laboratories and the medical industry, sensitive electronic equipment can be exposed to toxic chemicals, acidic and alkaline solvents that can accidentally spill onto a PCB, but the PCB’s “conformation coating” will protect the PCB and components from fatal injury.

Kedu otu esi etinye mkpuchi mkpuchi?

In fact, the method of applying “conformal paint” in the right way is so important that careful consideration must be given to how conformal paint is applied. It is as important to choose suitable conformal coating materials.

Isi ihe na -ekpebi ntinye kwesịrị ekwesị nke mkpuchi kwekọrọ bụ:

1- Ọkpụrụkpụ agba

2- The level of coverage achieved

3- The degree of adhesion of paint to wood panels and their components.

There are five methods for applying conformal coatings:

1- Jiri aka na-ese ihe n’aka

2- Aerosol mkpuchi

3- Atomizing spray gun coating

4- Automatic dip coating

5- Automatic selection of coating

Conformal mkpuchi ọgwụgwọ/ihicha usoro:

Conformal coatings themselves can be classified according to the drying and curing methods used after conformal coatings are completed. These methods are:

1- Heat/heat curing: Conformal coating is dried at high temperature. Drying rate is much faster than normal room temperature drying/curing.

2- ịgwọ ọrịa mmịnye: Ihe mkpuchi nke PCB na-akpọnwụ na ọnọdụ okpomọkụ, iru mmiri n’ime ikuku na-ebelata usoro ọgwụgwọ ma ọ bụ ihicha.

3- ULTRAVIOLET (UV) curing: Here PCB with conformal coating is exposed to UV radiation. The uv energy determines the curing speed of PCB conformal coating

4- Ngwọta ọgwụgwọ ọxịdashọn: N’ime usoro a, a na-ekpughere ndị na-ahụ maka PCB na mbara ikuku nwere nnukwu ikuku oxygen, nke ga-enyere aka na ihicha/ịgwọ ndị na-edozi ihe mgbaze.

5- Catalytic curing: This is the process of curing conformal coating in which two materials are fused together, one of which is conformal coating. Ozugbo agwakọtara mkpuchi ahụ na ihe mkpali ndị ọzọ, enweghị ike ịkwụsị usoro ọgwụgwọ ahụ ruo mgbe ọ gwụchara.

Classification of conformal coatings:

There are five main conformal coatings used: acrylic resin, epoxy resin, silicone, polyurethane (PU) and polyparaxylene coating.

L Acrylic resin (AAR):

Acrylics are ideal for (low-cost and high-volume) common electronics because AAR is inexpensive and can be easily applied to PCB surfaces by brush, dip, and manual or automatic spraying, reducing turnaround time and producing cost-effective products.

uru:

1 – ọnụ ala

2- Ọ dị mfe maka ngwa robot ma ọ bụ akpaka

3- Easy to rework

4- Ezigbo nchekwa mmiri

5- Good surface elasticity, can withstand static voltage discharge, and does not react with the atmosphere, therefore helps cure through solvent evaporation

ọghọm:

1- Due to the use of atmospheric curing/drying methods for this material, proper ventilation systems need to be ensured

2- mmezi viscosity dị ala

3- Nguzogide dị ala na nguzogide kemịkal

L Epoxy conformal coating (ER) :

Enwere ike iji mkpuchi aka, mkpuchi ma ọ bụ mikpuo ihe mechie mkpuchi mkpuchi dabere na resin epoxy. Akwadoro nfụkasị maka mpịakọta buru ibu yana maka obere olu ma ọ bụ PCBS ụdịrị.

uru:

1- High moisture resistance and good dielectric resistance

2- Excellent chemical resistance, abrasion resistance, moisture resistance and high temperatures up to 150 O C

ọghọm:

1-epoxy conformal paint is very hard and rigid and can damage PCB and its components if attempted peeling or removal. Wepu mkpuchi site n’iji ihe mgbaze dị ize ndụ

2- arụ ọrụ obere okpomọkụ adịghị mma

3- Mbelata ịgwọ ọrịa dị elu

4- Ha siri ike ịmegharị

L mkpuchi silicone resin (OSR):

The softest of the above two types of conformal coatings is silicone resin (OSR) conformal coatings. They are widely used in LED lamp PCBS without reducing light intensity or color change. Ideal for PCB installation at high humidity and exposure to air. Suitable for PCB with high operating temperature and high power

uru:

1- ezigbo nguzogide kemịkal, nguzogide mmiri, ịgba nnu na oke okpomọkụ ruo 200 OC

2- Ezi mgbanwe na-eme ka ọ na-eguzogide nrụgide ịma jijiji na PCB site na gburugburu mpụga.

3- Kwesịrị ekwesị maka ngwa mpụga PCB nwere oke iru mmiri

Ihe ọjọọ:

1- Adịghị eyi na-eguzogide n’ihi ihe roba

2- Enwere ike ịrụgharị ya, mana ọ naghị adị mfe, na-achọ ihe mgbaze pụrụ iche, ogologo oge ịse mmiri na mkpali dị ka ahịhịa ma ọ bụ ịsa ahụ ultrasonic.

3- Low mechanical strength, weak adhesion to PCB substrate

L polyurethane (PU) mkpuchi mkpuchi:

Kwesịrị ekwesị maka ngwa PCB na ụgbọ ala, ụlọ ọrụ mmepụta ihe, akụrụngwa na nkwukọrịta. N’elu ikuku, ọkachasị, uzu ọkụ na -ebikọ ọnụ na ngwa elektrọnik mgbe niile wee banye n’ime ime wee metụta bọọdụ PCB.

uru:

1- High resistance to moisture, chemicals (acid and alkali) and wear

ọghọm:

1- Mgbe ogologo usoro ọgwụgwọ zuru oke, ọ na-atụgharị atụgharị edo edo na oke okpomọkụ n’ihi ọdịnaya VOC ya dị elu.

2- Dị ka silicon, ọ dịghị mfe iwepu ya kpamkpam

L polyparaxylene conformal coating:

This type of coating is suitable for avionics, microelectronics, sensors, high-frequency circuits, and densely populated PCB-based components. It is applied by means of vapor deposition.

uru:

1- Excellent dielectric strength

2- High resistance to moisture, solvents, extreme temperatures and acid corrosion

3- Can be applied evenly with very thin paint.

ọghọm:

1- Ntughari/imegharị ihe siri ike

2- Ọnụ ego dị elu bụ nnukwu ndọghachi azụ.