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                丁基防水嵌縫密封膠填料(顏料)干燥

                • 發布時間 : 2023-10-27 17:42:37
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                (Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

                丁基防水嵌縫密封膠填料(顏料)干燥

                (Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

                • 發布時間 : 2023-10-27 17:42:37
                • Views:
                Information

                       預聚物的合成一般應在密封良好的有干燥Nz氣保護液面的不銹鋼反應釜中進行,合適的反應溫度為70-90 ℃。溫度偏低影響反應速度,溫度偏高副反應的速率也增加,導致預聚物的質量下降。溫度過高甚至會造成整釜凝膠報廢。

                       如果在預聚物合成中使用催化劑,反應結束后一般難以除去,預聚物的NCO含量和粘度指標在貯存過程中隨時間仍會緩慢變化。所以生產的預聚物應盡快使用,否則應保存在干燥密閉的有N:保護液面的不銹鋼容器里。貯存期勿3下咸使用前需復檢NCO含量和粘度指標.以決定能否滿足使用要求。

                       在大多數丁基防水嵌縫密封膠中,填料一般占有相當大的比重,其主要作用是增量,降低成本,也可在一定程度上改善丁基防水嵌縫密封膠的觸變性、耐熱性、導電性、機械強度等性能。適用于丁基防水嵌縫密封膠的填料較多,除常用的炭黑外,還有白炭黑、碳酸鈣、欽白粉、滑石粉、陶土粉等,可根據不同性能要求選擇不同的填料。

                       不管是何種填料,對細度都有一定的要求。填料粒子過粗,必然影響丁基防水嵌縫密封膠的外觀和強度指標;填料粒子過細,分散就比較困難,加料過程中粉塵污染也較大。比較適宜的填料細度在320目左右。

                       填料的pH值對丁基防水嵌縫密封膠的貯存穩定性有很大影響,一般應選擇pH值接近7或稍偏堿性。

                       由于單組分丁基防水嵌縫密封膠靠濕氣固化,填料中的水分會首先與預聚物的游離一NCO基團反應交鏈,導致丁基防水嵌縫密封膠變稠,擠出性變差,貯存期大為縮短.因此對使用的所有填料的水分含量指標要求苛刻。而填料在生產、貯存、運輸過程中吸潮是難免的,這就要求在使用前給予充分干燥。一般應控制填料的水分含量在0. OS%以下(用卡爾費休法測定)才能較有效地保證丁基防水嵌縫密封膠的貯存要求。www.qiquanonline.com

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