Pehea ka hopena o Melt Flow Index i ka LDPE Powder Coatings Performance

ʻO ka melt flow index (MI), i ʻike ʻia ʻo ka melt flow rate (MFR), he hōʻailona koʻikoʻi e ana i ka wai hoʻoheheʻe o ka polyethylene LDPE pauka pauka ma lalo o nā kūlana wela a me ke kaomi. Hoʻopili pololei kona waiwai i ka hana hana, ka maikaʻi o ka hana kiʻiʻoniʻoni, a me nā waiwai kino hope o ka uhi. Eia nā hopena kikoʻī o ka melt flow index i nā waiwai o ka LDPE powder coatings:

1. Pili i ka Hana Hana

ʻO ka wai a me ka maikaʻi o ka uhi ʻana

• MI kiʻekiʻe (e laʻa,> 20g / 10min): He mea maʻalahi ka hoʻoheheʻe ʻia ʻana o ka pauka i hoʻoheheʻe ʻia, kūpono ia no nā substrate me nā ʻano paʻakikī, nā lua hohonu, a i ʻole nā ​​wāwae maikaʻi (e like me nā paipu a me nā ʻāpana kūikawā). Hiki iā ia ke hoʻopiha koke i nā āpau a hōʻemi i nā wahi leakage uhi.
• MI haʻahaʻa (e laʻa, <5g/10min): He kiʻekiʻe ka viscosity o ka hehee a me ka wai maikaʻi ʻole. I ka wā o ka uhi ʻana, pono ke kiʻekiʻe o ka mahana a i ʻole ke kaomi; inā ʻaʻole, hiki ke loaʻa nā pilikia e like me ka uhi ʻole ʻana a me nā ʻōpū. ʻOi aku ka maikaʻi no nā mokulele maʻalahi a i ʻole nā koi uhi mānoanoa (e like me ka ʻili o nā papa).

ʻO ka wikiwiki o ka ho'ōla a me ka hana pono

ʻO LDPE me ka MI kiʻekiʻe e maʻalili a hoʻōla wikiwiki ma hope o ka hoʻoheheʻe ʻana, hiki ke hōʻemi i ka manawa hoʻōla ma ka laina hana a hoʻonui i ka ou.tput no ka manawa hookahi; Hiki i ka MI haʻahaʻa ke uhi i ka haki ʻana ma muli o ka hoʻohaʻahaʻa ʻole ʻana i ka wā hoʻoluʻu ma muli o ka viscosity kiʻekiʻe, no laila e koi ana i kahi manawa hoʻōla lōʻihi.

2. Ka hopena i ke ano o ka uhi

• ʻO ka pālahalaha a me ka nani: ʻO ka hoʻoheheʻe me MI kiʻekiʻe he wai maikaʻi. Ma hope o ka uhi ʻana, hiki ke kahe a pae ma ke ʻano maoli, e hana ana i kahi uhi ʻoluʻolu a kiʻekiʻe, a e hōʻemi i nā hemahema e like me ka peel alani a me nā pinholes; He paʻakikī ka hoʻoheheʻe ʻana me MI haʻahaʻa e kahe a pae, a ʻo ka ʻili o ka uhi ʻana ke ʻano ʻeleʻele me ka liʻiliʻi haʻahaʻa, a hiki i ka haʻalulu ʻana (i ka wā o ka uhi ʻana i ka ʻili kū pololei).
• Kaulike Mānoanoa: He kūpono ka MI kiʻekiʻe no nā ʻili lahilahi (e laʻa, 10-50μm), a hiki ke hoʻokō ʻia ka mānoanoa like ʻole ma o ka hoʻomalu ʻana i ka manawa hoʻoheheʻe; ʻoi aku ka maikaʻi o ka MI haʻahaʻa no nā uhi mānoanoa (e laʻa, 50-200μm), akā pono e hoʻomalu pono ʻia ka nui o ka uhi ʻana, inā ʻaʻole hiki ke hoʻonui ʻia ka ʻili a i ʻole ka mānoanoa ʻole ma muli o ka maikaʻi ʻole.

3. Pili i na waiwai kino o ka uhi

• Hoʻopili: ʻoi aku ka maikaʻi o ka hoʻopili ʻana o ka LDPE me ka MI medium (eg, 5-20g/10min): ʻaʻole hiki ke hoʻoheheʻe wale ʻia i loko o nā pores liʻiliʻi ma ka ʻili substrate e hoʻopili ai i ka mechanical, akā ʻaʻole ia e hoʻoulu i ke komo ʻana a me ka nalowale ma muli o ka wai ikaika loa (MI kiʻekiʻe) a i ʻole ka hoʻopaʻa ʻana ma muli o ka lawa ʻole o ka wai (MI haʻahaʻa).
• ʻO ka paʻakikī a me ka pale ʻana: ʻO ka uhi LDPE me ka MI haʻahaʻa he ʻoi aku ka paʻa o ke kaulahao molekala, a ʻoi aku ka paʻakikī o ka paʻa ʻana a ʻoi aku ka maikaʻi o ka pale ʻana ma hope o ka hoʻoilo, kūpono ia no nā hiʻohiʻona me nā koi kiʻekiʻe ma nā mea mechanical (e like me nā papahele a me nā mea hana); ʻO ka uhi me ka MI kiʻekiʻe he hoʻonohonoho molekala wehe, haʻahaʻa paʻakikī, a maʻalahi ke kālai ʻia, akā ʻoi aku ka maʻalahi.
• ʻO ka hoʻololi a me ka pale ʻana i ka hopena: ʻO ka uhi LDPE me ka MI kiʻekiʻe he ʻoi aku ka maʻalahi a hiki ke kū i ka liʻiliʻi deformation o ka substrate (e like me ke kuʻi ʻana a me ka haʻalulu) me ka ʻole o ka haki ʻana, kahi kūpono no nā substrates maʻalahi e like me nā plastics a me nā ʻāpana metala; ʻo ka uhi ʻana me MI haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa a hiki i ka haʻihaʻi haʻihaʻi ke hoʻopili ʻia, akā ʻoi aku ka kiʻekiʻe o ka ikaika tensile.

PECOAT® hoʻolālā i ka melt flow index (MI) e like me ka huahana e uhi ʻia.

4.Summary

• No nā ʻano ʻano paʻakikī, nā ʻili lahilahi, a me nā koi hoʻonani kiʻekiʻe → MI kiʻekiʻe (e laʻa, 20-100g/10min);
• No nā uhi mānoanoa, paʻakikī kiʻekiʻe, a me nā koi kūʻē → haʻahaʻa MI (e laʻa, 0.5-5g/10min);
• No ka hoʻopili kaulike a me nā hiʻohiʻona honua → medium MI (eg, 5-20g/10min).

Hoʻohui Pākuʻi:

ʻO LDPE pauda i uhi ʻia i ka pauda Thermoplastic Nā Paʻa Paʻa Paʻa Thermoplastic Powder Pena - Mea Hoʻolako, Hoʻomohala, Pono a me nā ʻino ʻO ka pauda Thermoplastic no ka Luʻu ʻana ʻO Polyolefin Polyethylene PO/PE ka uhi ʻana i ka pauka no ka ʻili kila He aha ka Polyethylene (PE) ka pauda?