우레탄 수지 첨가에 의한 다이니마/비닐에스터 복합재료의 방탄효과 향상을 고찰하였다. 첫째로 우레탄 수지와 비닐에스터 수지를 스프레이 코팅하여 프리프레그를 제조하였으며, 수지함량을 21%로 조절하였다. 또한 혼합수지를 스프레이 코팅과 필름코팅으로 비교를 위한 프리프레그를 제조하였다. 그 다음 이들을 상온에서 1-2시간, 그리고 필요시 $100^{\circ}C$ 30분 정도 건조시켰다. 이들 프리프레그를 24층 적층한 다음 $120^{\circ}C$에서 5분 동안 정치 시킨 후 25분 동안 150 $kg/cm^2$ 압력하에서 경화 시켰다. 모의 파편탄(17 gr)을 이용하여 이들 복합재료의 방탄성능($V_{50}$)를 측정하였으며, UP127 및 EB8200으로 제조된 시편은 XSR10으로 제조된 시편에 비하여 각각 6.5 및 9.0 % 향상된 값을 보였다.
우레탄 수지 첨가에 의한 다이니마/비닐에스터 복합재료의 방탄효과 향상을 고찰하였다. 첫째로 우레탄 수지와 비닐에스터 수지를 스프레이 코팅하여 프리프레그를 제조하였으며, 수지함량을 21%로 조절하였다. 또한 혼합수지를 스프레이 코팅과 필름코팅으로 비교를 위한 프리프레그를 제조하였다. 그 다음 이들을 상온에서 1-2시간, 그리고 필요시 $100^{\circ}C$ 30분 정도 건조시켰다. 이들 프리프레그를 24층 적층한 다음 $120^{\circ}C$에서 5분 동안 정치 시킨 후 25분 동안 150 $kg/cm^2$ 압력하에서 경화 시켰다. 모의 파편탄(17 gr)을 이용하여 이들 복합재료의 방탄성능($V_{50}$)를 측정하였으며, UP127 및 EB8200으로 제조된 시편은 XSR10으로 제조된 시편에 비하여 각각 6.5 및 9.0 % 향상된 값을 보였다.
Polyurethane oligomers (PUOs) such as UA8297, UP127 and EB8200 were utilized to enhance the anti-bullet property of Dyneema$^{(R)}$/vinylester composites. First, prepregs of PUO and vinylester (XSR10) were prepared via spray coating on Dyneema$^{(R)}$ fabric at 21 % resin conte...
Polyurethane oligomers (PUOs) such as UA8297, UP127 and EB8200 were utilized to enhance the anti-bullet property of Dyneema$^{(R)}$/vinylester composites. First, prepregs of PUO and vinylester (XSR10) were prepared via spray coating on Dyneema$^{(R)}$ fabric at 21 % resin content (by volume). In addition, spray coating and film lamination were also carried out with a mixture of XSR10/PUO for selected PUOs. Next, the prepregs were dried at RT for 1-2 h and then at $100^{\circ}C$ for 30 min to remove the solvent and to provide partial cure when necessary. The prepregs were stacked in 24 layers and cured at $120^{\circ}C$ for 5 min under the contact pressure and for additional 25 min at 150 $kg/cm^2$. Finally, the anti-bullet properties of composite samples were evaluated by measuring $V_{50}$ with simulated fragment projectile (SFP, 17 gr). The results showed a 6.5 and 9.0 % increase of $V_{50}$ with UP127 and EB8200, respectively.
Polyurethane oligomers (PUOs) such as UA8297, UP127 and EB8200 were utilized to enhance the anti-bullet property of Dyneema$^{(R)}$/vinylester composites. First, prepregs of PUO and vinylester (XSR10) were prepared via spray coating on Dyneema$^{(R)}$ fabric at 21 % resin content (by volume). In addition, spray coating and film lamination were also carried out with a mixture of XSR10/PUO for selected PUOs. Next, the prepregs were dried at RT for 1-2 h and then at $100^{\circ}C$ for 30 min to remove the solvent and to provide partial cure when necessary. The prepregs were stacked in 24 layers and cured at $120^{\circ}C$ for 5 min under the contact pressure and for additional 25 min at 150 $kg/cm^2$. Finally, the anti-bullet properties of composite samples were evaluated by measuring $V_{50}$ with simulated fragment projectile (SFP, 17 gr). The results showed a 6.5 and 9.0 % increase of $V_{50}$ with UP127 and EB8200, respectively.
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제안 방법
Considering the high speed of bullets, 3,110 ft/s (948 m/s) for a M16 rifle for example[20], the current personal armor composites are not good enough to provide complete protection, and further research on a new class of fibers, as well as matrix resins, is needed. In this study, therefore, we attempted to modify vinylester resins for personal armor composites by incorporating diacrylated polyurethane oligomers(PUOs), which are very tough materials and can be cured with vinylester resin via acrylate end-groups. In addition to resin modification, spray coating of resins was also attempted to minimize resin impregnation and thus, to maximize the anti-bullet property, while prepregging by film lamination was also carried out for comparison purposes.
Since a preliminary study showed good consolidation of prepregs with good solvent resistance (complete cure), large size composites were prepared for anti-bullet testing by varying the stacking sequence of XSR10 and PUO (XSR10/PUO/XSR10: 12/0/12. 6/12/6, 3/18/3, and 0/24/0). This was unnecessary for spray coating or film lamination of mixed resins, since the ratio of resin mixture has already been varied (XSR10/PUO: 100/0, 50/50, 25/75 and 0/100).
The anti-bullet property was evaluated with 17 gr SFP by calculating V50 from 9 shots. The flexural and Izod impact properties were also evaluated for selected composites in order to gain a better understanding of ballistic properties.
To gain a better understanding of the enhanced anti-bullet property, the impact property and flexural strength of the composites prepared with UP 127 were evaluated. As seen in Fig.
대상 데이터
The anti-bullet properties of composites were evaluated using 17 gr SFP bullets (Fig. 1). As shown in Table 1, the control sample of XSR10 composites (12/0/12) exhibited V50 of 480 m/sec, which decreased with the incorporation of UA8297(3k) prepregs to 478, 466, and 458 m/sec for 6/12/6, 3/18/3 and 0/24/0 samples corresponding to 50, 75, and 100 % PUO, respectively.
However, the stacking sequence was not considered when using prepregs from resin mixtures. The composite samples (240x200 mm) were subjected to anti-bullet property measurements with SFP (17 gr, 1.1g) at Samyang ComTech (Anseng, Korea). As seen in Fig.
성능/효과
The anti-bullet property of XSR10/Dyneema composites, prepared by spray coating of the resins (XSR10 or PUO) followed by their sequential stacking, was highly enhanced by the incorporation of PUO resins such as UP127 and EB8200, showing an improvement as high as 6.5 and 9.0%, respectively. The composites prepared by spray coating of mixed resins (XSR10/UP127) also exhibited similar V50 values as composites prepared by sequential stacking.
후속연구
Considering the high speed of bullets, 3,110 ft/s (948 m/s) for a M16 rifle for example[20], the current personal armor composites are not good enough to provide complete protection, and further research on a new class of fibers, as well as matrix resins, is needed. In this study, therefore, we attempted to modify vinylester resins for personal armor composites by incorporating diacrylated polyurethane oligomers(PUOs), which are very tough materials and can be cured with vinylester resin via acrylate end-groups.
참고문헌 (22)
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