Wanihi polyurethane - he rauemi mutunga hou

Ko te whanaketanga o ngā hangarau hou mo te hanga o ngā rauemi oti taea ki te whakaputa i ngā hua hou, me te hou katoa ki te maha o ngā āhuatanga ahurei. Taua hou pā polyurethane kararehe.

Ko tēnei rauemi tohu he rongoā hanganga rerekē o isocyanates polyfunctional hydroxyl. Polyurethane kararehe ka tono puka i runga i te mata o te waerau totoka ki te hanganga e toru-ahu. puta ana tēnei tukanga e tika ana ki te tauhohe o isocyanates ki wāhanga hydroxyl (ngā pūhui oti whiwhi e te tauhohenga o te taikaha o te waipiro polyhydric ki te waikawa dibasic ranei ki ranunga o te monobasic me waikawa ngako dibasic).

E mea pinepine whakamahia a wāhanga hydrolyzed acetates polyvinyl, polyacetals oti, hākawa cellulose, me teriuma ksilolformaldegidnye phenol-formaldehyde. I roto i te isocyanates whakamahia diisocyanate tino noa whakamahia me ngā ranunga ona. Ano, te whakamahi i hexamethylene diisocyanate me nga hua tauhohe o te taikaha diisocyanate ki te waipiro polyhydric me hydroxyl kei roto ngā pūhui. Mahi ki enei rauemi rapu whakatūpatotanga motuhake. Ko reira reira atu mahi ki te whakamahi i "āraia" ranei "huna" isocyanates, pūhui nei e ngāwari decomposed ka wera. Tenei rōpū ngā nga hua tauhohe o isocyanates ki malonic, hākawa acetoacetic, ethyleneimine me feniluretanom. rewa lacquers polyurethane te whakamahi i ngā hākawa, ketones, waiwaro chlorinated, nitroparaffins. Ēnei taputapu diluent he xylene, toluene, pūwaro tīmeka.

E wātea ana rite kotahi-wae e rua-wae ranei tito lacquers polyurethane. I roto i te take tuarua rite wehe otinga o pūhui hydroxyl-kei roto, ranunga o enei pūhui me rongoā isocyanate ranei i mua i te whakamahi i tenei kaihoko e konatunatua. pupuri i te kararehe e rua-wae ineine taua te i 4 ki te 48 haora. E whakamahia taua coatings mō te paninga o te haamărôraa wera, me te matao. Unlimited whakaaro coatings kotahi-wae pūmau wera-whakaora i hanga i runga i te pūtake o pera-ka karanga "āraia" isocyanates.

Polyurethane wanihi hanga he mōhinuhinu, coatings rapa ki pakeke tiketike, adhesion pai, āhuatanga uruhanga tiketike, me te ātete matū. Kei te piki haere te whakamahia ratou mo te tiaki o te raima, whakarewa, papa rakau, me te te whakamahia mō te peita i te taputapu o te matū, tango, me te kaitahi para tipu, i runga i hinonga kai.

polyurethane wātea wanihi mo parquet, taonga, rapa, pepa, hiako, te hangahanga naval, papanga waihanga me kirihou. Ko te tino roa me te mahi tenei paninga, reira nui ake te ora papa o rauemi rerekē. Kei te maha coatings kotahi-wae whakamahia mo te tiaki o ngā hua parahi, konumohe, me te whakarewa.

wai polyurethane wanihi tiaki nga taiepa rakau me tuanui o te pokepokea ai, me te koriri. Ko reira tino marama, me te wera-ātete. Tenei paninga mārama taea maitai ngā te ataahua tūturu o te rakau.