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纳米SiO2-端羧基丁腈橡胶改性水性环氧树脂复合材料的制备及性能

Preparation and properties of nano SiO2-carboxyl carboxyl nitrile rubber modified water-based epoxy resin composite

    摘要
  • 摘要: 以端羧基丁腈橡胶（CTBN）和纳米SiO2（nano SiO2）为增韧剂，先利用相反转法将CTBN与环氧树脂（EP）的共聚物制备成乳液，然后加入nano SiO2进行共混，最后加入固化剂经梯度升温固化制得nano SiO2-CTBN改性的水性环氧树脂（nano SiO2-CTBN/WEP）复合材料。通过FTIR、SEM、TEM、万能拉伸试验仪和TG对nano SiO2-CTBN/WEP复合材料的性能进行表征。结果表明：当CTBN含量为20%（与EP E-51的质量比）时，所制备的CTBN/WEP具有较好的储存稳定性，在此基础上加入nano SiO2，当其含量为3%时增韧效果最好，nano SiO2-CTBN/WEP的拉伸强度达14.5 MPa，断裂伸长率达9.1%，冲击强度为11.3 kJ/m2，弯曲强度达22.4 MPa，较未添加nano SiO2的CTBN/WEP分别提高了40.1%、27.4%、73.9%和72.7%，其初始热分解温度也提高了近25℃。

     

    Abstract: The carboxyl carboxyl nitrile rubber (CTBN) and nano-silica (nano SiO2) were used as toughening agents, the copolymer of CTBN and epoxy resin (EP) were prepared as an emulsion by reverse transfer, followed by addition of nano SiO2 for blending. Finally, the curing agent was added to prepare the nano SiO2-CTBN modified water-based EP(nano SiO2-CTBN/WEP) composite by gradient heating. The properties of the nano SiO2-CTBN/WEPcomposite were characterized by an FTIR, SEM, TEM, universal tensile tester and TGA. The results show that:when the CTBN mass fraction is 20%(mass ratio to EP E-51), the prepared CTBN/WEP emulsion exhibites better storage stability. The addition of 3% nano SiO2 in CTBN/WEP resultes in the best effect of toughening. The tensile strength is 14.5 MPa, the elongation at break is 9.1%, the impact strength is 11.3 kJ/m2 and the flexural strength is 22.4 MPa, which increase by 40.1%, 27.4%, 73.9% and 72.7%, respectively, compared with the CTBN/WEP sample without adding of nano SiO2. The initial thermal decomposition temperature of the nano SiO2-CTBN/WEP also increases by nearly 25℃.

     

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