He aha ka Nucleating agent?

ʻO ka nucleating agent kahi ʻano mea hoʻohui hou e hiki ke hoʻomaikaʻi i nā waiwai kino a me nā mīkini o nā huahana e like me ka transparency, surface gloss, tensile strength, rigidity, heat distortion temperature, impact resistance, creep resistance, etc. . Hoʻohana nui ʻia ia i ke kaʻina hana o nā plastics crystalline incompletely e like me ka polyethylene a me ka polypropylene i loko o ka automotive, mea hana hale, meaʻai, uila, a me nā kula olakino. No ka laʻana, ʻo ka nucleating agent he mea koʻikoʻi i ka hana ʻana i nā resins hana kiʻekiʻe e like me ka polypropylene kiʻekiʻe melt index polypropylene, kiʻekiʻe-rigidity hou, kiʻekiʻe-toughness, a me ka polypropylene kiʻekiʻe-crystallinity, β-crystalline polypropylene, a me nā mea polypropylene i hoʻololi ʻia no ka kaʻa. nā noi pā lahilahi. Ma ka hoʻohui ʻana i nā mea hana nucleating kikoʻī, hiki ke hana ʻia nā resins me ka hoʻomaikaʻi ʻana i ke aniani, rigidity, a me ka paʻakikī. Me ka piʻi nui o ka hana home o ka polypropylene hana kiʻekiʻe e koi ai i ka hoʻohui ʻana o nā mea nucleating a me ka ulu wikiwiki o ka noi no ka māmā māmā a me nā mea hoʻokaʻawale pākaukau lithium, aia ka nui o ka hoʻomohala ʻana no ka mākeke nucleating agent ma.

Nui nā ʻano onā mea hana nucleating agents, a ke hoʻomau nei ka holomua o kā lākou huahana. E like me nā ʻano aniani ʻokoʻa i hoʻoulu ʻia e nā mea nucleating agents, hiki ke hoʻokaʻawale ʻia lākou i nā mea hana nucleating α-crystalline a me β-crystalline nucleating agents. A hiki ke hoʻokaʻawale hou ʻia nā mea hana nucleating α-crystalline i nā ʻano inorganic, organik, a me ka polymer e pili ana i kā lākou ʻokoʻa. ʻO nā mea hana nucleating inorganic ka nui o nā mea kanu nucleating i hoʻomohala mua ʻia e like me ka talc, calcium oxide, a me ka mika, he mea kūʻai ʻole a maʻalahi ke loaʻa akā ʻaʻole i ʻike maikaʻi ʻia a me ka nani o ka ʻili. Organic nucleating agents nui nā carboxylic acid metala paʻakai, phosphate metala paʻakai, sorbitol benzaldehyde derivatives, etc. I waena o lākou, sorbitol benzaldehyde derivatives i kēia manawa i ka oʻo loa nucleating apono, me ka maikaʻi hana a me ka haʻahaʻa kumu kūʻai, a ua lilo i ka loa hooulu ana, okoa. , a me ke ʻano nui o nā mea hana nucleating ma ka home a ma ka honua. ʻO nā mea hoʻoheheʻe polymer ka nui o nā mea hoʻoheheʻe polymeric nucleating kiʻekiʻe, e like me ka polyvinylcyclohexane a me ka polyvinylpentane. β-crystalline nucleating agents he ʻelua ʻano ʻano: he helu liʻiliʻi o nā pūhui polycyclic me nā hale quasi-planar, a me nā mea i haku ʻia me kekahi mau waikawa dicarboxylic a me nā oxides, hydroxides, a me nā paʻakai o nā metala mai ka Pūʻulu IIA o ka papaʻaina. β-crystalline nucleating agents e hōʻoiaʻiʻo i ka wela deformation wela o nā huahana i ka hoʻomaikaʻi ʻana i kā lākou hopena hopena.

Nā Laʻana o nā Hana Huahana a me nā Hoʻohana ʻana o nā Agena Nucleating