360E4861312 Clear, Trsp
專業(yè)代理伊斯曼公司產(chǎn)品 李醋酸纖維素 cellulose acetate；CA
系纖維素分子中羥基用醋酸酯化后得到的一種化學改性的天然高聚物。其性能取決于乙酰化程度。
市售產(chǎn)品可分為一般的醋酸纖維素（乙?；?7%～40%）。常加入增塑劑用作注塑制件如牙刷把、刷子等。高乙酰含量的醋酸纖維素（乙酰基含量40%～42%），白色粒狀、粉狀或棉狀固體。對光穩(wěn)定，不易燃燒，在稀酸、汽油、礦物油和植物油中穩(wěn)定，在三氯甲烷中溶脹，溶于丙酮、醋酸甲酯等，能為稀堿液侵蝕，具有堅韌、透明、光澤好等優(yōu)點，熔融流動性好，易成型加工。二氯甲烷均相法采用精制棉短絨和醋酐，以乙酰硫酸為觸媒，在溶劑二氯甲烷存在下進行酯化，部分水解，可得到結(jié)合醋酸含量在60%±0.5%范圍內(nèi)的醋酸纖維素。傳統(tǒng)方法是將精制棉短絨干燥，用醋酸活化，在硫酸觸媒存在下，用醋酸和醋酐混合液乙?；缓蠹酉〈姿崴獾剿鶎僦〈?，中和觸媒，沉析，脫酸洗滌，精煮干燥得成品。經(jīng)部分水解的稱二醋酸纖維素，酯化度γ值220～270。未經(jīng)水解的，即酯化度γ值為300者稱三醋酸纖維素。二醋酸纖維素塑料可做各類工具手柄、計算機及打字機的字母數(shù)字鍵、機殼、汽車方向盤、紡織器材零件、收音機開關及絕緣件、筆桿、眼鏡架及鏡片、玩具、日用雜品等，也可做海水淡化膜。三醋酸纖維素，其熔點高，只能配成溶液后加工，用作電影膠片片基、X光片基、絕緣薄膜電磁、錄音帶、透明容器、銀鋅電池中的隔膜等。
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Tenite Propionate 360E0096908m Natural Trsp | Eastman Chemical Company | CAP |
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Tenite Propionate 360E3V45516 Water Clear Trsp. | Eastman Chemical Company | CAP |
Tenite Propionate 360E4861312 Clear, Trsp | Eastman Chemical Company | CAP |
Tenite Propionate 360E4861314 Clear, Trsp | Eastman Chemical Company<SPAN style="FONT-SIZ |
