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彩钢板专用黑白胶的使用注意事项

返回列表 来源: 发布日期: 2020.08.25

彩钢板专用黑白胶的使用注意事项

山东彩钢板专业厂家当使用黑白胶时,一般比例为1:1,二者均匀地混合在钢板上,大约35秒就能达到初始粘合力,90秒左右就可以达到良好的粘合力,所以可以切割钢板。

小心:
山东彩钢板专业厂家按黑白胶1:1的比例,可以达到满意的粘接效果,也可以增加黑胶的用量。白胶和黑胶的比例是1:1.25。
1如果白胶用量过大,反应速度会变快,产生的胶层会变软,粘结性不好。如果黑胶用量过大,反应时间会慢,产生的胶层又硬又脆,强度不高,而且容易断裂。
2山东彩钢板专业厂家胶水的用量不容易太大或太小。如果胶量太小,粘合剂和胶层就不能充分润湿,不能达到良好的粘接效果。如果胶量过大,会形成较厚的胶层,这是对胶料的浪费。另一方面,不能使钢板与钢板接触粘结,形成的胶层容易开裂
三。山东彩钢板专业厂家温度对黑白胶的反应时间有很大影响。当温度升高时,黑白胶的反应时间明显加快,车速相应提高。当温度下降时,黑白胶的反应时间明显缩短。此时,有必要在白胶中加入一些催化剂,以达到适当的生产速度。
4胶粘剂的粘接效果与空气和纸板中的水分含量有非常明显的关系。当空气或纸板中的含水量增加时(特别是阴天和雨季),水会消耗黑胶中大量的异氰酸酯基团,增加羟基,增加相应黑胶的粘度,导致下降不均,黑白胶比例不平衡,降低结合强度。

When black and white glue is used, the general ratio is 1:1, the two are evenly mixed on the steel plate, the initial bonding force is achieved in about 35 seconds, and the good bonding force is achieved in about 90 seconds, so the plate can be cut.

be careful:
According to the ratio of black and white glue 1:1, the satisfactory bonding effect can be achieved, or the amount of black glue can be enlarged. The ratio of white glue to black glue is 1:1.25.
1. If the amount of white glue is too large, the reaction speed will become faster, the resulting adhesive layer will be soft, and the bonding is not good. If the amount of black glue is too large, the reaction time will be slow, the resulting adhesive layer is hard and brittle, the strength is not high, and it is easy to fracture.
2. The amount of glue is not easy to be too large or too small. If the amount of glue is too small, the binder and the adhesive layer can not be fully wetted, which can not achieve a good bonding effect. If the amount of glue is too large, a thicker adhesive layer will be formed, which is a waste of adhesive. On the other hand, it is unable to make the plate and steel plate contact and bond, and the formed adhesive layer is easy to crack
3. The reaction time of black and white glue is greatly affected by temperature. When the temperature rises, the reaction time of black and white glue will obviously accelerate, and the vehicle speed will increase correspondingly. When the temperature drops, the reaction time of black and white glue will obviously decrease. At this time, it is necessary to add some catalyst to the white rubber to achieve the appropriate production speed.
4. The bonding effect of adhesive has a very obvious relationship with the moisture content in the air and the board. When the water content in the air or in the board increases (especially in cloudy days and rainy seasons), water will consume a large number of isocyanate groups in the black glue, increase the hydroxyl group, and increase the viscosity of the corresponding black glue, resulting in uneven drop, imbalance of black and white glue ratio, and reducing the bonding strength.

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