Akụkọ - Otu esi edozi nsogbu nke agba odo nke resin unsaturated

Dị ka ihe mejupụtara,polyester resin na-adịghị mmaejirila ya mee ihe nke ọma na mkpuchi, eriri iko plastik mesiri ike, nkume wuru ewu, ọrụ aka, na ubi ndị ọzọ. Otú ọ dị, agba odo nke resins na-enweghị atụ bụ nsogbu mgbe niile maka ndị na-emepụta ihe. Dị ka ndị ọkachamara si kwuo, ihe ndị na-emekarị na-acha odo odo nke resin unsaturated gụnyere ihe ndị a:

1. N'oge esterification njikọ usoro nke unsaturated resin, n'ihi thermal ịka nká yellowing kpatara elu okpomọkụ, n'ozuzu esterification okpomọkụ nke unsaturated resin bụ 180 ~ 220 Celsius ma ọ bụ ọbụna elu, na nke a okpomọkụ resin dị mfe na-atụgharị edo edo ruru. ka thermal ịka nká, na-emetụta ọdịdị nke ngwaahịa resin.

2. Ihe na-acha odo odo kpatara site na ikpughe resin na ụzarị ultraviolet na-emekarị site na ọnụnọ nke mgbanaka benzene na resin (gụnyere aromatic dibasic acids / anhydrides na benzene mgbanaka nke styrene webatara), nke nwere ike ịbụ n'ihi ikuku oxidation nke aromatic. ogige na elu okpomọkụ. Mmebi, na-adịkarị mfe na ntụgharị eletrọnịkị, na-eme ka resin na-acha odo odo.

3. N'ime usoro mmepụta resin, a na-ekpughe ihe ndị na-emepụta ihe na ikuku oxygen n'ihi adịghị arụ ọrụ mkpuchi nke ngwaọrụ ahụ. Agbụ nke molekụla nke polyester izugbe na-enweghị isi nwere ọ bụghị naanị otu ester, otu meridian na otu antelope, kamakwa agbụ abụọ na mgbanaka aromatic. Ọ na-enweta mmebi oxidative thermal, na arụmọrụ doro anya bụ na agba nke resin na-atụgharị edo edo.

4. Mmetụta nke mgbakwunye dị ka antioxidants, polymerization inhibitors, ndị na-agwọ ọrịa, wdg Amine antioxidants na-adị mfe converted n'ime nitroxide free radicals agba ngwaahịa. Ndị na-egbochi polymerization a na-ejikarị eme ihe, dị ka hydroquinone, bụ Oxidation n'ime quinones n'ihu quinones, nke n'onwe ha nwere agba, si otú ahụ na-emetụta agba nke resin. Ụfọdụ ndị na-emepụta ihe na-agwọ ọrịa ka na-eji acyl peroxide-tertiary amine sistemu na ketone peroxide metal ncha. Resin nwere agba, dị mfe agba.

N'ezie, e nwere ihe ndị ọzọ na-eme ka resin gbanwee odo. N'ikwu okwu n'ozuzu, ikuku oxygen na ụzarị ultraviolet bụ isi ihe kpatara odo odo. A na-eji saturated dibasic acid (ma ọ bụ acid anhydride) mee ihe kama iji aromatic dibasic acid (ma ọ bụ acid anhydride), ọ bụ ezie na enwere ike iji ya n'ókè ụfọdụ, agba nke resin nwere ike ime ka ọ dịkwuo ọkụ, ma na-atụle ihe dị iche iche dị ka resin arụmọrụ na ọnụ ahịa, usoro a adịghị mma.

Dị ka ndị ọkachamara si kwuo, na mgbakwunye na ijuputa gas inert na mmepụta na usoro nchekwa iji gbochie kọntaktị na oxygen dị ka o kwere mee, ụzọ dị irè karị bụ ịgbakwunye antioxidants na ultraviolet absorbers, nke nwere ike igbochi ncha odo nke polyester retarded. Ngwọta mgbochi edo edo ndị ọkachamara kwadoro maka resin enweghị saturated bụ:

A na-ahọrọ antioxidants ndị na-enweghị amines, a na-ejikwa ihe ndị bụ isi na ndị inyeaka na-ejikọta ọnụ. Ndị isi antioxidants na-abụkarị phenols na-egbochi, nke nwere ike ijide peroxide free radicals; ndị na-enyere aka antioxidants bụ phosphites, nke Mgbe decomposing hydroperoxide, ọ nwekwara ike chelate metal ion iji gbochie resin si oxidative discoloration. Ọ bụrụ na ịchọrọ ịkwalite nkwụsi ike na-acha odo odo na nguzogide ihu igwe, a na-atụ aro ka ịgbakwunye ihe ntinye UV. Ịgbakwunye UV absorber nwere ike igbochi ihe na-acha odo odo nke ihe polymer n'okpuru ọrụ nke ụzarị ultraviolet, ma na-enye nchebe dị mma na ngwaahịa ahụ, na-egbochi nke ọma Mbelata gloss, ọgbọ nke cracks, afụ, na delamination nwere ike ime ka ihu igwe dịkwuo mma. nke ngwaahịa, na ọ nwere ezigbo synergistic mmetụta mgbe eji ya na antioxidants. N'ezie, ojiji nke antioxidants na UV absorbers enweghị ike isi dozie nsogbu nke yellowing, ma n'ime a ụfọdụ nso, ọ ka nwere ike n'ụzọ dị irè igbochi oxidative yellowing nke unsaturated polyester ngwaahịa, na-na ngwaahịa watercolor transperent, ma melite àgwà ngwaahịa. ọkwa.

Anyịpolyester resins na-adịghị mmadị n'ụdị dị iche iche, yana resin na-adịghị edo edo, dị ka ndị a: