Packaging Technology丨Surface Pretreatment Technology yePlastiki Zvigadzirwa

Nhanganyaya: Nzira yekugadzira yezvigadzirwa zvepurasitikikunyanya zvinosanganisira maitiro mana akakosha: kuumba mold, kurapwa kwepamusoro, kudhinda, uye kubatanidza.Kurapa kwepamusoro chikamu chakakosha chakakosha.Kuti uvandudze simba rekubatanidza rejasi uye nekupa yakanaka conductive base yeplating, iyo pre-kurapa maitiro inodiwa.

Surface pretreatment yezvigadzirwa zvepurasitiki
Kunyanya kunosanganisira kurapwa kwekupfekedza uye kurapwa kweplating.Kazhinji, mapurasitiki ane hukuru hukuru hwekristallinity, diki polarity kana kuti isina polarity, uye yakaderera pamusoro pesimba, izvo zvinokanganisa kunamatira kwekupfeka.Sezvo plastiki isiri-conductive insulator, haigone kuiswa zvakananga pamusoro pepurasitiki zvinoenderana neyakajairwa electroplating process yakatarwa.Naizvozvo, pamberi pekurapwa kwepamusoro, pretreatment inodiwa inofanirwa kuitwa kuti ivandudze kusimba kweiyo yekupfeka uye nekupa conductive yepasi layer ine yakanaka yekubatanidza simba replating.

Preatment of coating

Pretreatment inosanganisira degreasing of plastic surface, kureva kuchenesa oiri uye kuburitsa mumiririri pamusoro, uye activate epurasitiki pamusoro, kuitira kuvandudza adhesion of coating.

1, kuderedza
Degreasing ofzvigadzirwa zvepurasitiki.Zvakafanana nekudzikisa mafuta ezvigadzirwa zvesimbi, kupera kwezvigadzirwa zvepurasitiki zvinogona kuitwa nekuchenesa neorganic solvents kana kudzikisa nealkaline aqueous solutions ine surfactants.Degreasing neorganic solvents kwakakodzera kuchenesa parafini, wakisi, mafuta uye imwe organic tsvina kubva pamusoro pepurasitiki.Iyo organic solvent inoshandiswa haifanirwe kunyungudika, kuzvimba kana kutsemura epurasitiki, uye ine yakaderera kubikira, inoputika, isingaite chepfu uye isingabatike.Alkaline aqueous solutions akakodzera kubvisa alkali-resistant mapurasitiki.Mhinduro yacho ine caustic soda, alkaline munyu uye akasiyana surfactants.Iyo inonyanya kushandiswa surfactant ndeye OP yakatevedzana, kureva alkylphenol polyoxyethylene ether, isingaite furo uye isingarambe iri pamusoro pepurasitiki.

2 、 Surface activation
Iyi activation ndeye kuvandudza zvimiro zvepasi zvemapurasitiki, ndiko kuti, kugadzira mamwe mapoka epolar pane epurasitiki kana kuti roughen kuitira kuti iyo yekupfekedza inogona kuve nyore kunyorova uye adsorbed pamusoro peiyo workpiece.Kune nzira dzakawanda dzepamusoro activation kurapwa, dzakadai semakemikari oxidation, flame oxidation, solvent vapor etching uye corona discharge oxidation.Inonyanya kushandiswa ikemikari yekristaro oxidation kurapwa, iyo inowanzoshandisa chromic acid kurapwa mvura, uye yakajairika fomula i4.5% potassium dichromate, 8.0% mvura, uye 87.5% concentrated sulfuric acid (kupfuura 96%).

Zvimwe zvigadzirwa zvepurasitiki, senge polystyrene uye ABS mapurasitiki, anogona kuvharirwa zvakananga pasina makemikari oxidation kurapwa.Kuti uwane kupfekedzwa kwemhando yepamusoro, kemikari oxidation kurapwa inoshandiswa zvakare.Semuyenzaniso, mushure mekudzikisa, ABS purasitiki inogona kugadzirwa ne dilute chromic acid yekurapa mvura.Yayo yakajairika yekurapa fomula ndeye 420g/L chromic acid uye 200ml/L sulfuric acid (chaiyo giravhiti 1.83).Iyo yakajairika kurapwa maitiro ndeye 65 ℃70 ℃/5min10min, kugeza mvura, uye kuomesa.Chakanakira etching ne chromic acid kurapwa mvura ndechekuti kunyangwe chimiro chechigadzirwa chepurasitiki chakaomarara sei, chinogona kurapwa zvakaenzana.Izvo zvakashata ndezvekuti kuvhiyiwa kune njodzi uye kune matambudziko ekusvibiswa.
Preatment of coating coating

Chinangwa che pretreatment yekuputira coating ndeye kuvandudza kunamatira kweiyo coating kune epurasitiki pamusoro uye kugadzira conductive simbi yepasi layer pamusoro pepurasitiki.Iyo pretreatment maitiro anonyanya kusanganisira: mechanic roughening, makemikari degreasing, makemikari roughening, sensitization kurapwa, activation kurapwa, kuderedza kurapwa uye makemikari plating.Zvinhu zvitatu zvekutanga ndezvokuvandudza kunamatira kwekuputira, uye zvinhu zvina zvekupedzisira ndezvekugadzira conductive metal bottom layer.

1, Mechanical roughening uye makemikari roughening
Mechanical roughening uye kemikari roughening kurapwa ndeyekuita kuti pasi pepurasitiki riome nenzira dzemuchina uye nzira dzemakemikari zvakateerana kuwedzera nzvimbo yekubatana pakati pekuputira nesubstrate.Zvinowanzotendwa kuti simba rekubatanidza iro rinogona kuwanikwa ne mechanical roughening rinongosvika gumi kubva muzana reiyo yemakemikari roughening.

2, Chemical degreasing
Nzira yekubvisa mafuta yepreatment yeplastic surface coating yakangofanana nenzira yekubvisa mafuta yepreatment of coating.

3、Kukurudzira
Sensitization ndeyekushambadza zvimwe zvinhu zviri nyore oxidized, senge tin dichloride, titanium trichloride, nezvimwewo, pamusoro pemapurasitiki ane kumwe kushambadza kugona.Izvi adsorbed zviri nyore oxidized zvinhu zvine oxidized panguva activation kurapwa, uye activator inoderedzwa kuita catalytic crystal nuclei uye inoramba iri pamusoro pechigadzirwa.Basa rekusimudzira nderekuisa hwaro hweinotevera kemikari yeplating metal layer.

4、Kuitwa
Activation ndeye kurapa iyo sensitized surface nerubatsiro rwemhinduro ye catalytically active metal compounds.Hunhu hwayo ndehwekunyudza chigadzirwa chakashambadzirwa neanodzikisira mumhinduro ine aqueous ine oxidant yesimbi yakakosha munyu, kuitira kuti iyo yakakosha simbi ion ideredzwe neS2+n seoxidant, uye iyo yakaderedzwa simbi yakakosha inoiswa pa pamusoro pechigadzirwa nenzira yecolloidal particles, iyo ine simba rakasimba rinoita basa.Kana nzvimbo iyi yakanyudzwa mumushonga wemakemikari weplating, zvimedu izvi zvinova nzvimbo dzinosimudzira, izvo zvinomhanyisa chiyero chekuita kwemakemikari plating.

5、Kuderedza kurapwa
Pamberi pekugadzira kemikari, zvigadzirwa zvakagadziriswa uye zvakashambidzwa nemvura yakachena zvinonyudzwa mune imwe nzvimbo yekudzikisa agent solution inoshandiswa mumakemikari plating kuderedza uye kubvisa iyo isina kushambwa activator.Izvi zvinonzi kurapwa kwekuderedza.Kana kemikari mhangura yakaputirwa, mhinduro ye formaldehyde inoshandiswa pakuderedza kurapwa, uye kana kemikari nickel yakaputirwa, sodium hypophosphite solution inoshandiswa pakuderedza kurapwa.

6, Chemical plating
Chinangwa chemakemikari plating ndeyekugadzira conductive simbi firimu pamusoro pezvigadzirwa zvepurasitiki kugadzira mamiriro e electroplating simbi simbi yezvigadzirwa zvepurasitiki.Naizvozvo, kugadzirwa kwemakemikari inhanho yakakosha mupurasitiki electroplating.


Nguva yekutumira: Jun-13-2024
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