Kuumbwa kuti epurasitiki kumba.

Mapurasitiki vava rakajairika muupenyu hwedu hwezuva nezuva. Plastic kugadzirwa siyana zvenyaya motokari, zvivako, midziyo, uye midziyo, nezvirongo uye zvakawanda. Kazhinji epurasitiki handyman pamusha rinoshandiswa senzira mbishi acho kubereka-siyana anobatsira zvinhu.

mapurasitiki All anoshandiswa kugadzira mhuri zvigadzirwa, mapoka mapoka maviri: thermoplastic uye thermosetting.

Thermosets dzinoratidzwa kufadza kwoukukutu uye shoma plasticity kuti dzinovabvumira kwete itye kana kupfavisa kana neshungu.

Kana neshungu kune imwe tembiricha thermoplastics, ivo zvinonyauka asi kana tembiricha anodonhedza zvakare kuva zvakasimba. pfuma iyi zvinoita thermoplastics jekiseni Kuumbwa kumba uye kuti mashoko.

Chii Zvinoumba mapurasitiki? How mapurasitiki yakaitwa kumba?

Homemade mapurasitiki inogona akagadzira mukati zvinotevera nenzira. Vanofanira kunge vakavhengana yakanaka sawdust uye magnesite mu nhamba 2: 1, kudururira musanganiswa mhinduro kubva 0.1% magnesium chloride uye kumutsa kuti vawane pasty mamiriro. Kuti vawane zvakawanda mapurasitiki dzakadaro anoshandiswa chikuru nzira - jekiseni Kuumbwa pamba chimiro. Panguva solidification, mapurasitiki richava zvikuru yakakwirira nesimba pamwe pokuita zvakanaka kurapwa, kureva, hazvina kuoma vanochera, jeko, kubata hasha mudziyo kana munhu faira.

Zvinokwanisika kubereka epurasitiki zvimwe. Zvakakodzera kusanganisa wakanaka huni guruva pamwe talc pasi nhamba 5: 2 ugodira takagadzirira kare joiner kuti guruu. The namira inofanira kuva kwemashoko gobvu cream. The zvichiguma muvhenganiswa yaiva kurunga zvakakodzera kuti vawane pasty mamiriro. Musoro yokusuma musanganiswa 2.1 chikamu nokuda vakawanda kana potashi alum, ichipa kudzivirira chakuvhuvhu uye mafuta dzinongoitika nokuomesa, anopa rakawedzera ductility. kana kutsvakwa, mapurasitiki inogona chitsvuku. To ichi anofanira kuwedzera Kuronga mapurasitiki aniline dhayi achida ruvara. Kuti uwane mashoko pamusoro nzira mukugadzira - vachikanda mapurasitiki mumba mune chimiro. Kuwedzera simba mapurasitiki ari musanganiswa nenguva gadzira pachinzvimbo guruu akadurura thickened nitro kana nitrocellulose lacquer. Details unovaitawo vachikanda.

Unhu yakanaka mapurasitiki, iyo yakagadzirirwa kubvira zvinotevera zvinoumba paper yakaoma uremu / yakaoma womuvezi guruu / yakanaka vachikuya choko / glycerol / panyaya iyi / yakaoma ocher, vari hwakakanyiwa maererano zvikamu maererano nokurema 5/28/60 / 2.5 / 3, 5/1.

Zvinonzi yakapwanyika zvakasimba akaoma kurema bepa ugodira rakasanganiswa joiner wacho guruu. Panguva dilution inofanira zvishoma nezvishoma raitongwa glycerol, choko, ocher uye doro, achiri nokusanganisa nayo. Parts nezvakavhenganiswa ichi anoshandiswa sezvo pakuumba mapurasitiki mumba. The chigadzirwa iri chitsvuku, kana akawedzera musanganiswa aniline.

Phenol-formaldehyde mapurasitiki vari nyore kubika pamba. Tinofanira kutora crystalline (phenol) hydroxybenzene kana analogs uye aqueous mhinduro 40% formalin. Nekutsvaga carbolic asidhi anonyatsokwanisa kutsiviwa phenol. Zvakakodzera kusanganisa kuti crystalline phenol (20g) pamwe formalin (30 g), achiwedzera kuramba hydrochloric asidhi (30 madonhwe). Asi phenol angashandiswa carbolic asidhi (40ml). Musanganiswa inofanira nomuzvarirwo vakuchidzire ubike, uye vachava kwemashoko rinoonekera uye viscous. The zvichiguma uremu kudira kupinda Foroma kwemaminitsi 30 pashure musanganiswa raiva muchimiro achinyatsotaurira kufashaira mvura kwemaminitsi 10-15. Zvadaro unogona kubvisa chigadzirwa kubva chakuvhuvhu. Saka kuwana nebwe - iri thermosetting mapurasitiki pamwe yakatsvukuruka ruvara, mumwe kwoukukutu uye simba. Kubva zvichibvira kubudisa zvikamu kuti inoitirwa kuti pasi zvinokosha zvinorema.