Polyurethane coating zvinhu zvinogara yero nekufamba kwenguva nekuda kwekuratidzwa kwenguva refu kune ultraviolet mwenje kana kupisa, zvichikanganisa chitarisiko chavo uye hupenyu hwesevhisi. Nekuunza UV-320 uye 2-hydroxyethyl thiophosphate mune cheni yekuwedzera ye polyurethane, isina-nionic mvura-yakavakirwa polyurethane ine yakanakisa kupikisa kutsvuka yakagadzirwa uye yakaiswa kune yematehwe. Kuburikidza nemusiyano weruvara, kugadzikana, kuongorora maikorosikopu erekitironi, X-ray spectrum uye mamwe maedzo, zvakaonekwa kuti iwo ese musiyano weruvara △E wedehwe wakabatwa nezvikamu makumi mashanu zve nonionic water-based polyurethane nekunyatso ramba yellowing yaive 2.9, giredhi rekuchinja kweruvara raive giredhi 1, uye paingova nekushanduka kwemavara kushoma. Yakasanganiswa neayo ekutanga maratidziro ekusimba kweganda uye kupfeka kuramba, inoratidza kuti yakagadzirira yero-resistant polyurethane inogona kuvandudza yero inodzivirira yeganda ichichengetedza michina yayo uye kupfeka kuramba.

Sezvo mararamiro evanhu akavandudzika, vanhu vane zvinodikanwa zvepamusoro zvemakusheni ezvigaro zvematehwe, zvisingangoda kuti zvive zvisina njodzi kuhutano hwevanhu, asi zvinodawo kuti zvive zvinofadza. Mvura-based polyurethane inoshandiswa zvakanyanya mumatehwe ekuputira ematehwe nekuda kwekuchengetedza kwayo kwakanakisa uye kusvibiswa-kusina kuita, kupenya kwakanyanya, uye amino methylidynephosphonate chimiro chakafanana neicho chematehwe. Zvisinei, mvura-based polyurethane inowanzoita yero pasi pesimba renguva refu ye ultraviolet chiedza kana kupisa, inokanganisa hupenyu hwebasa rezvinhu. Semuenzaniso, akawanda machena shangu polyurethane zvinhu zvinowanzoita yero, kana kune yakakura kana zvishoma, pachava neyero pasi pekupenya kwezuva. Naizvozvo, zvakakosha kuti tidzidze kuramba kutsvuka kwemvura-yakavakirwa polyurethane.

Parizvino pane nzira nhatu dzekuvandudza kupikisa kweyero ye polyurethane: kugadzirisa chikamu chezvikamu zvakaoma uye zvinyoro uye kushandura mbishi kubva pamudzi wechikonzero, kuwedzera organic additives uye nanomaterials, uye kugadzirisa kwemaitiro.

(a) Kugadzirisa chikamu chezvikamu zvakaoma uye zvakapfava uye kushandura zvinhu zvakasvibirira zvinongogadzirisa dambudziko re polyurethane pachayo iri kungoita yero, asi haigone kugadzirisa kukanganiswa kwekunze kwezvakatipoteredza pa polyurethane uye haigone kuzadzisa zvinodiwa pamusika Kuburikidza neTG, DSC, abrasion resistance uye tensile kuyedza, zvakaonekwa kuti zvimiro zvemuviri weiyo yakagadzirirwa mamiriro ekunze-resistant polyurethane neiyo yakachena polyurethane neganda reganda. weather-resistant polyurethane inogona kuchengetedza zvakakosha zvematehwe uku ichivandudza zvakanyanya kumira kwayo kwemamiriro ekunze.

(b) Kuwedzeredzwa kweorganic additives uye nanomaterials zvakare kune matambudziko senge yakakwira yekuwedzera huwandu uye kushomeka kwemuviri kusanganiswa ne polyurethane, zvichikonzera kudzikira kwe polyurethane mechanical properties.

(c) Disulfide zvisungo zvine simba reversibility, zvichiita kuti simba re activation rive rakaderera, uye rinogona kuputswa uye kuvakwazve kakawanda. Nekuda kwekuchinja kudzoreredzwa kwema bond e disulfide, zvisungo izvi zvinogara zvakaputswa uye kuvakwa patsva pasi pe ultraviolet mwenje irradiation, ichishandura ultraviolet mwenje simba kuita kupisa simba rekuburitsa. Iyo yero ye polyurethane inokonzerwa ne ultraviolet chiedza irradiation, iyo inofadza kemikari zvisungo mu polyurethane zvinhu uye zvinokonzera bond cleavage uye kugadzirisa patsva maitiro, zvichiita kuti kuchinja kwemaitiro uye yellowing ye polyurethane. Naizvozvo, nekuisa disulfide zvisungo mumvura-based polyurethane cheni zvikamu, kuzvirapa uye yellowing kuramba kuita kwe polyurethane kwakaedzwa. Zvinoenderana nebvunzo yeGB/T 1766-2008, △E yaive 4.68, uye giredhi rekuchinja kweruvara raive level 2, asi sezvo yaishandisa tetraphenylene disulfide, ine rumwe ruvara, haikodzere yellowing-resistant polyurethane.

Ultraviolet light absorbers uye disulfides inogona kushandura iyo yakanyura ultraviolet mwenje kuita kupisa kwesimba kuburitsa kudzikisa pesvedzero yeultraviolet mwenje mwenje pane polyurethane chimiro. Nekuunza iyo inoshanduka inodzoreredza chinhu 2-hydroxyethyl disulfide mu polyurethane synthesis yekuwedzera nhanho, inounzwa mu polyurethane chimiro, inova disulfide komboni ine hydroxyl mapoka ayo ari nyore kuita neisocyanate. Mukuwedzera, UV-320 ultraviolet absorber inounzwa kuti ishande pamwe nekuvandudzwa kwepolyurethane's yellow resistance. UV-320 ine hydroxyl mapoka, nekuda kwehunhu hwayo hwekuita nyore nemapoka eisocyanate, inogona zvakare kuunzwa muzvikamu zve polyurethane cheni uye inoshandiswa mukati kati jasi redehwe kuvandudza yeyero kuramba kwe polyurethane.

Kuburikidza neyedzo yemusiyano weruvara, zvakaonekwa kuti yero kuramba kweyero resistance polyureth Kuburikidza neTG, DSC, abrasion resistance uye tensile kuyedza, zvakaonekwa kuti zvimiro zveyakagadzirirwa inodzivirira mamiriro ekunze polyurethane uye dehwe rakabatwa nepurethane yakachena zvaienderana, zvichiratidza kuti iyo inodzivirira mamiriro ekunze polyurethane inogona kuchengetedza zvakakosha zvimiro zveganda uku ichivandudza zvakanyanya kumira kwayo kwemamiriro ekunze.