郑州玻璃钢的缺点有哪些
一、弹性模量低
One, low elastic modulus
FRP的弹性模量比木材大两倍，但比钢(E=2.1×106)小10倍，因此在产品结构中常感到刚性不足，容易变形。
FRP modulus of elasticity is two times larger than that of wood, but it is 10 times smaller than that of steel (E=2.1 * 106). Therefore, it is often used in the product structure to be rigid and prone to deformation.
可以做成薄壳结构、夹层结构，也可通过高模量纤维或者做加强筋等形式来弥补。
Can be made into a thin shell structure, sandwich structure, but also by high modulus fiber or reinforcement form to make up.
二、长期耐温性差
Two, long-term resistance to temperature difference
一般FRP不能在高温下长期使用，通用聚酯FRP在50℃以上强度就明显下降，一般只在100℃以下使用;通用型环氧FRP在60℃以上，强度有明显下降。但可以选择耐高温树脂，使长期工作温度在200~300℃是可能的。
General FRP can not be used at high temperature for long time, general polyester FRP at 50 degrees above the intensity is obviously decreased, generally only in the use of 100, general type FRP at 60 C, the intensity has decreased significantly. But it is possible to choose high temperature resistant resin, which can make the long-term working temperature at 200~300.
三、老化现象
Three, aging phenomenon
老化现象是塑料的共同缺陷，FRP也不例外，在紫外线、风沙雨雪、化学介质、机械应力等作用下容易导致性能下降。
Aging is a plastic common defects, FRP is no exception, in the UV, wind, sand, rain and snow, chemicals, mechanical stress and under the effect of easily lead to performance degradation.
四、层间剪切强度低
Four, the shear strength is low.
层间剪切强度是靠树脂来承担的，所以很低。可以通过选择工艺、使用偶联剂等方法来提高层间粘结力，最主要的是在产品设计时，尽量避免使层间受剪。
The shear strength between the layers is assumed by the resin, so it is very low. By selecting process, using coupling agent and other methods to improve the bonding strength, the most important is in the product design, as far as possible to avoid shear.
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