Moulding ntawm yas nyob rau hauv tsev.

Yas yog tam sim no feem ntau nyob rau hauv peb lub neej txhua hnub. Yas manufactured ntau yam ntsiab ntawm cov tsheb, vaj tse, khoom siv, thiab tej rooj tog, tais diav thiab ntau npaum li cas. Feem ntau yas handyman nyob rau hauv tsev yog siv raws li ib tug raw khoom rau tsim ib tug ntau yam uas pab tau cov khoom.

Tag nrho cov yas yog siv los tsim khoom hauv tsev, muab faib mus rau hauv ob pawg: thermoplastic thiab thermosetting.

Thermosets yus muaj los ntawm lub siab tshaj plaws hardness thiab yam tsawg kawg nkaus plasticity uas tso cai rau lawv mus tsis yaj los yog muag thaum rhuab.

Thaum rhuab mus rau ib tug tej yam kub thermoplastics, lawv yaj, tab sis yog hais tias tus kub dauv dua ruaj nrees. Qhov no tej khoom vaj tse enables thermoplastics txhaj molding nyob rau hauv tsev thiab ua kom paub meej.

Yuav ua li cas yog tus yeees ntawm cov yas? Yuav ua li cas yas yog ua nyob hauv tsev?

Qhob yas formulated nyob rau hauv cov nram qab no yam. Yuav tsum kom huv si mixed zoo sawdust thiab magnesite nyob rau hauv tus piv 2: 1, ncuav lub sib tov tshuaj ntawm 0.1% magnesium chloride thiab do thiaj li mus nrhiav tau ib tug pasty lub xeev. Nyob rau hauv thiaj li yuav tau cov ntsiab lus ntawm tej yas yog siv yooj yim txoj kev - txhaj tshuaj molding nyob rau hauv tsev rau hauv cov duab. Thaum lub sij hawm solidification, cov yas yuav ua heev zog nrog zoo raws li rau kev kho mob, xws li, nws tsis yog nyuaj rau tho, kaw, lis cov abrasive cuab tam los yog ib cov ntaub ntawv.

Nws yog ua tau rau ua yas txwv tsis pub. Nws yog tsim nyog los sib tov zoo ntoo muaj plua plav talc av nyob rau hauv tus piv 5: 2 thiab ncuav npaj ua ntej joiner tus nplaum. Cov nplaum yuav tsum tau muaj ib tug sib xws ntawm tuab cream. Cov uas ua sib tov yog do tsim nyog thiaj li mus nrhiav tau ib tug pasty lub xeev. Tsim Nyog ua kom paub ib tug sib tov ntawm 2.1 ib feem los ntawm loj los yog potash alum, muab kev tiv thaiv tiv thaiv pwm thiab tej yam ntuj tso kom qhuav roj, muab nce ductility. Yog hais tias qhov kev kawm, cov yas yuav dawb lias. Yuav kom qhov no yuav tsum tau ntxiv rau cov muaj pes tsawg leeg ntawm lub yas aniline zas yam xim. Kom paub meej ntawm cov qauv ntawm cov raug - casting yas nyob rau hauv lub tsev nyob rau hauv lub cev. Yuav kom nce lub dag lub zog ntawm yas nyob rau hauv lub ntoos sib xyaw thaum lub sij hawm ntawm kev siv thiab ua es tsis txhob ntawm cov kua nplaum nchuav nyeem tas nitro los yog nitrocellulose lacquer. Paub meej kuj los ntawm casting.

Zoo yam ntxwv yog yas, uas yog npaj los ntawm cov hauv qab no Cheebtsam: daim ntawv qhuav nyhav / qhuav ntoo tus lo / zoo sib tsoo cwj mem av dawb / glycerol / ethanol / qhuav ochre, tov raws li rau qhov chaw los ntawm qhov hnyav ntawm 5/28/60 / 2.5 / 3, 5/1.

Nws yog xav crushed qhuav nyhav ntawm daim ntawv thiab ncuav lub diluted joiner tus nplaum. Thaum lub sij hawm lub dilution yuav tsum tau maj mam muab glycerol, cwj mem av dawb, ochre thiab haus dej haus cawv, tseem nws nws. Qhov ntawm no sib tov yog siv raws li molding yas nyob rau hauv lub tsev. Cov khoom no dawb lias, yog ntxiv rau ib tug sib tov ntawm aniline.

Phenol-formaldehyde yas kuj tsis yog yooj yim mus ua noj nyob rau hauv tsev. Peb yuav tsum crystalline (phenol) hydroxybenzene los yog analogs thiab cov aqueous tov ntawm 40% formalin. Concentrated carbolic acid yog tag nrho muaj peev xwm mus hloov phenol. Nws yog tsim nyog los sib tov rau hauv lub crystalline phenol (20g) nrog formalin (30 g), ntxiv concentrated hydrochloric acid (30 ncos). Es tsis txhob, lub phenol tej zaum yuav siv carbolic acid (40ml). Cov sib tov yuav tsum nthawv sov thiab boil, thiab yuav ua lub taub hau ntawm glassy thiab khov. Cov uas ua loj mus ncuav rau hauv lub puab rau 30 feeb tom qab uas lub sib tov yog nyob rau hauv daim ntawv raus nyob rau hauv boiling dej rau 10-15 feeb. Ces koj yuav tshem tawm cov khoom los ntawm cov pwm. Yog li tau cob - yog ib tug thermosetting yas nrog ib tug reddish xim, ib tug hardness thiab lub dag lub zog. Los ntawm nws yog ua tau rau ua qhov chaw uas yog npaj yuav tsum tau raug mus rau teeb meem loj loads.