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反應溫度對聚氨酯密封膠合成反應的影響

  • 發布時間 : 2023-6-19 8:56:56
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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.

反應溫度對聚氨酯密封膠合成反應的影響

(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 : 2023-6-19 8:56:56
  • Views:
Information

       以PPG8000和3一異氰酸醋基丙基三甲氧基硅烷為原料,nN(70):n(OH)=1.2:1,催化劑質量分數o.os%條件下,考察反應溫度對合成聚氨酯密封膠的影響,結果見表2。表z反應溫度對聚氨酯密封膠合成反應的影響反應溫度/℃反應時間/h聚合物顏色淺黃色透明淺黃色透明淺黃色透明黃色透明由表2可見,隨著反應溫度的增加,反應時間依次減少。當反應溫度控制在90℃時,反應時間比較理想,約為3h。溫度進一步升高,反應時間略有縮短,但聚合物顏色加深,預示著過高反應溫度可能會影響聚氨酯密封膠原料的穩定性,并加重原料氧化。因此,反應溫度宜控制在900C。NCO與OH的量之比對聚氨酯密封膠合成反應的影響以PPG8000和3一異氰酸醋基丙基三甲氧基硅烷為原料,反應溫度900C,催化劑質量分數為0.1%條件下,考察原料中NCO與OH的量之比對合成聚氨酯密封膠聚合物的影響,結果見表3。由表3可見,隨著n(NCO):n(OH)的增加,反應時間依次減少。當n(NCO):n(OH)-1.1:1時,反應時間過長,到達反應終點需要7h;當nNCO):nOH)提升至1.3:1時,反應在1h內即可結束,但聚合物顏色較深,且反應需要使用較多的3一異氰酸醋基丙基三甲氧基硅烷,而該硅烷價格較高。因此綜合考慮,選取nNCO):n(OH)=1.2:1更為合適。www.16878m.com

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