相關標簽:日本可樂麗 PMMA、LG化學 PMMA、比利時Polycasa PMMA塑料顆粒、絕緣 PMMA、輻射消毒 PMMA、注射成型 PMMA塑料顆粒
PMMA工藝特性,M6X3^6^%`*b4_,PMMA加工要求更嚴格,對水分和溫度非常敏感,加工前應充分干燥(推薦干燥條件為90°C,2~4)小時)熔體粘度大,需要在高(225-245℃)和壓力下形成,模具溫度優選為65-80℃.PMMA不是很穩定,并且由于下降而引起高溫或在較高溫度下過度停留。螺桿速度不應太大(約60%)。較厚的PMMA部件易于“空腔”。需要采用大閘門和“低材料溫度,高模溫和慢速”注入路徑進行加工。(來源:GlobalPlasticsNetwork)PMMA加工特性(1)PMMA在加工溫度下,熔體的流變性基本上接近非牛頓型,即其熔體粘度主要受壓力(剪切速率)的支配。因此,主要通過增加壓力來降低粘度和增加流動性是必要的。然而,其熔體粘度遠高于PE,PS等,因此注塑所需的壓力很高。此外,熔體粘度隨溫度升高而降低,并且比其他熱塑性塑料對溫度更敏感。因此,需要控制溫度以便于成型。(2)PMMA顆粒在空氣中容易吸濕,最高可達3%。必須在模塑前進行干燥,否則會形成氣泡。使用退貨時要多加注意。(3)由于PMMA是無定形聚合物,因此成型收縮率小至0.5至1.8%。(4)由于PMMA熔體粘度高,流動性差,冷卻速度快,內應力容易產生,PMMA成型工藝嚴格,模具設計要求高,產品一般需要后處理。(5)PMMA產品在儲存和使用過程中容易出現銀紋;銀紋的出現是玻璃態聚合物脆性斷裂的先決條件,銀色條紋材料的破裂導致裂縫的引發和膨脹,從而發生最終的破裂。銀紋是由材料中的內應力引起的,因此在成型過程中應注意減少或避免它們,即在成型過程中有足夠的保持時間。。此外,熔體粘度隨溫度升高而降低,并且比其他熱塑性塑料對溫度更敏感。因此,需要控制溫度以便于成型。 。以上文獻若需轉載請備注出處:PBT樹脂 //shanglikaiguan.cn/
其它 其它 其它 | |
性能項目 | 試驗條件[狀態] | 測試方法 | 測試數據 | |
密度 | ASTM D792 | 1.18 | 23度比重 | |
抗壓強度 | ASTM D695 | 101 | MPa | |
拉伸模量 | ASTM D638 | 2480 | MPa | |
屈服點拉伸強度 | ASTM D638 | 55.8 | MPa | |
彎曲模量 | ASTM D790 | 2690 | MPa | |
屈服點彎曲強度 | ASTM D790 | 96.5 | MPa | |
屈服點伸長率 | ASTM D638 | 4.8 | % | |
缺口沖擊強度 | ASTM D256 | 36.3 | J/m | |
平行流動方向 | ASTM D696 | 0.000074 | cm/cm/℃ | |
熱傳導 | ASTM C177 | 0.091 | W/m/K | |
熱變形溫度 | 264 psi,未退火 | ASTM D648 | 84.4 | ℃ |
折射率 | ASTM D542 | 1.490 | ||
透光度 | ASTM D1003 | 91.1 | % | |
霧度 | ASTM D1003 | 2.5 | % |
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