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不同的增塑劑對硅烷改性聚氨酯密封膠的影響

  • 發布時間 : 2023-9-14 11:42:29
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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.

不同的增塑劑對硅烷改性聚氨酯密封膠的影響

(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 : 2023-9-14 11:42:29
  • Views:
Information

       增塑劑的選擇不同的增塑劑對硅烷改性聚氨酯密封膠的力學性能和工藝性能有較大影響。我們選用氯化石蠟一52、鄰苯二甲酸丁節醋(BBP)、鄰苯二甲酸二丁醋(DBP)和一種自制的耐低溫性能較好的增塑劑(JLH)作為原材料,添加量為總量的15%,考察其對硅烷改性聚氨酯密封膠各方面性能的影響。

       將各種原材料按照3.1配方,增塑劑分別選擇上述4種,將B組分按100:10的比例混合均勻后,制成玻璃一鋁“工”字型試樣(制作方法參照2.2.1),將試樣于標況下養護14d后,測其性能,結果如表2。

       由表2可看出,增塑劑選用氯化石蠟一52時,硅烷改性聚氨酯密封膠強度小、硬度小、伸長率大,中空玻璃在運輸過程中受力后可能會發生錯位,且耐低溫性能不好,不適合高寒地區使用;選用BBP或者DBP,工藝性能好,但是伸長率小,定伸能力差,在高寒地區中空玻璃內外溫差較大時,不能承受較大的位移變形;綜合各種性能,選用增塑劑JLH最合適。

       硅烷改性聚氨酯密封膠選用的填料多為碳酸鈣,包括重質碳酸鈣和輕質碳酸鈣。重質碳酸鈣又有活性和非活性之分,輕質碳酸鈣也有活性、非活性、納米型之分。添加不同的碳酸鈣,對于硅烷改性聚氨酯密封膠的性能影響也是非常大的(表3)。經過實驗對比,選用活性重質碳酸鈣和納米型輕質碳酸鈣復合使用,兩者比例為10:1時,各項性能最好,滿足高寒地區中空玻璃的性能要求。

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