在原装容器内避光低温（5-22°C）保存，可以保存4个月。如果是冷藏保存，使用前，请先把胶水温度恢复到室温。 使用本物质时，应小心谨慎，请先阅读材料安全数据表，还包括其它关联产品资料，如：酒精、丙酮或甲基氯。应避免长时间皮肤接触，受影响部位应用肥皂和水彻底冲洗干净。如果胶水进入眼睛，用水冲洗15分钟，并寻求医疗帮助。请在通风良好的场合使用本品，否则，建议使用NIOSH认可的有机物蒸汽防毒面具。
NOA74 光传输性能
Norland紫外固化光学胶NOA74
Norland紫外固化光学胶NOA74是一种透明、暴露在长波紫外光下即可固化的液态光聚物。这种粘合剂是单组分、100%实体，具有光学透明、快速固化以及在宽温度范围内长期稳定等优点。使用NOA74胶省去了其它光学粘和系统中通常需要预混合、干燥或热固化等操作。
NOA74推荐用于粘结塑料和塑料或塑料和玻璃。74对醋酸-丁酸纤维素(CAB)和玻璃，CR-39有着优秀的粘接力，对偏振膜,尼龙,聚碳酸酯和丙烯酸酯类也有良好的粘接性能。
NOA 74 also has excellent clarity, low shrinkage and a slight flexibility that make it superior to other materials for optical bonding. These characteristics are important in order for the user to produce high quality optics and achieve long term performance under changing environments.
NOA 74 is cured by ultraviolet light with maximum absorption between 320-400 nanometers. The peak absorption wavelengths are 325 and 365 nanometers. The recommended energy required for full cure is 4.5 Joules/cm2 for long wave UV.
In most optical applications, curing is done in two steps. A short, uniform exposure, or precure, is used first. The precure time is of sufficient duration to set the bond and allow it to be moved without disturbing alignment. This is followed by a longer cure under UV light to obtain full cross-linking and solvent resistance of the adhesive. The precure can be obtained in 15 seconds using a 100 watt mercury lamp at 6". Where longer time is required for alignment, it can be extended to a few minutes using a very low intensity light source. The final cure can be accomplished in 5 to 10 minutes using the 100 watt mercury lamp.
The precure allows the user to align and set the precision parts quickly and minimizes the number of holding fixtures required. After the precure, excess adhesive can be wiped up with an alcohol or acetone moistened cloth. Assemblies should be inspected at this time and rejects separated in methylene chloride. The bonded area must be soaked in the solvent and normally will separate overnight. The time required to break the bond depends upon the extent of the cure and the size of the bond area. Caution should be taken when using methylene chloride as it dissolves many plastics.
When fully cured, NOA 74 has very good adhesion and solvent resistance, but it has not reached its optimum adhesion to glass. This will come with aging over a period of about 1 week in which a chemical bond will form between the glass and adhesive. This optimum adhesion can also be obtained by aging at 50° C for 12 hours.
NOA 74 can withstand temperatures before aging from -15°C to 60° C. . After aging, when used for glass bonding, it will withstand temperatures from -80° C to 90° C.
NOA74的典型数据
实体 |
粘度25° C |
固化后聚合物折射率 |
拉伸极限 |
弹性模量(psi) |
抗拉强度(psi) |
硬 度—Shore D |
100% |
80-95 cps |
1.52 |
38% |
2900 |
217 |
30 |