Kodi Nucleating agent ndi chiyani?

Nucleating agent ndi mtundu wa zowonjezera zatsopano zomwe zimatha kusintha mawonekedwe akuthupi ndi makina azinthu monga kuwonekera, gloss pamwamba, kulimba kwamphamvu, kulimba, kutentha kupotoza kutentha, kukana kwamphamvu, kukana kukwawa, ndi zina zambiri. . Amagwiritsidwa ntchito kwambiri popanga mapulasitiki osakwanira crystalline monga polyethylene ndi polypropylene mu magalimoto, zida zapanyumba, chakudya, zamagetsi, ndi zamankhwala. Mwachitsanzo, nucleating agent ndi chinthu chofunikira kwambiri popanga utomoni wapamwamba kwambiri monga high melt index polypropylene, high-rigidity, high-toughness, high-crystallinity polypropylene, β-crystalline polypropylene, ndi polypropylene zosinthidwa za galimoto. mapulogalamu woonda-mipanda. Powonjezera ma nucleating agents, ma resin omwe amawonekera bwino, olimba, komanso olimba amatha kupangidwa. Ndikuchulukirachulukira kwakupanga kwapakhomo kwa polypropylene yogwira ntchito kwambiri komwe kumafunikira kuwonjezeredwa kwa ma nucleating agents komanso kukula kwachangu pakufunidwa kwa magetsi opepuka agalimoto ndi olekanitsa ma batri a lithiamu, pali kuthekera kwakukulu kwa msika wa nucleating agent.

Pali mitundu yambiri yama nucleating agents, ndipo ntchito yawo yogulitsa ikupitilirabe bwino. Malinga ndi mitundu yosiyanasiyana ya makristalo omwe amapangidwa ndi nucleating agents, amatha kugawidwa kukhala ma α-crystalline nucleating agents ndi β-crystalline nucleating agents. Ndipo ma α-crystalline nucleating agents amathanso kugawidwa m'magulu a inorganic, organic, ndi polima potengera kusiyana kwawo. Zinthu zopangira ma nucleating nyukiliya makamaka zimaphatikizira zida zopangira ma nucleating monga talc, calcium oxide, ndi mica, zomwe ndi zotsika mtengo komanso zosavuta kuzipeza koma zosawonekera bwino komanso zonyezimira. organic nucleating agents makamaka carboxylic acid zitsulo salt, phosphate zitsulo salt, sorbitol benzaldehyde zotumphukira, etc. Pakati pawo, sorbitol benzaldehyde zotumphukira pakali pano okhwima nucleating wothandizira, ndi ntchito bwino ndi otsika mitengo, ndipo akhala kwambiri mokangalika, zosiyanasiyana. , ndi mtundu waukulu kwambiri wa zida zopangira ma nucleating mkati ndi kunja. Ma polima ma nucleating agents makamaka amakhala apamwamba kwambiri osungunuka a polymeric nucleating agents, monga polyvinylcyclohexane ndi polyvinylpentane. β-crystalline nucleating agents makamaka imakhala ndi mitundu iwiri: mankhwala ochepa a polycyclic okhala ndi quasi-planar structures, ndi omwe amapangidwa ndi dicarboxylic acid ndi oxides, hydroxides, ndi mchere wazitsulo kuchokera ku Gulu IIA la periodic table. β-crystalline nucleating agents amatsimikizira kutentha kwa zinthu zomwe zimapangidwira ndikuwongolera kukana kwawo.

Zitsanzo za Ntchito Zogulitsa ndi Kugwiritsa Ntchito Ma Nucleating Agents