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点胶机的UV胶固化后为什么会发白及解决办法

发布时间:2019-06-03 15:37:41   来源:本文搜集于网络,由自动点胶机厂家创盈时代整理并发布,欢迎转载    点击:

想了解UV胶固化后为什么会发白,首先要知道UV胶的固化原理,UV固化材料中的光敏剂在紫外线的照射下吸收紫外光后产生活性自由基或阳离子,引发单体聚合、交联化学反应,使粘合剂在数秒钟内由液态转化为固态。
Want to know why UV glue is condensed after curing, first of all to know the curing principle of UV glue, the photosensitizer in UV curing material absorbs ultraviolet light under ultraviolet light to produce active free radicals or cations, trigger monomer polymerization, cross-linking The chemical reaction causes the binder to be converted from a liquid to a solid in a matter of seconds。

UV胶发白现象其实是胶层本身产生的微小气泡,因为胶水固化过程中会产生收缩,如果胶层厚度不均或硬度过高,收缩所产生的内应力无法释放,时间长了就会出现微小气泡,也就是我们看到的发白现象,直至粘接的材料脱落。
The phenomenon of UV glue whitening is actually the tiny bubbles generated by the glue layer itself, because the glue will shrink during the curing process. If the thickness of the glue layer is uneven or the hardness is too high, the internal stress generated by the shrinkage cannot be released, and it will appear after a long time. The tiny bubbles, that is, the whitish phenomenon we see, until the bonded material falls off.

UV胶点胶机

解决此问题的办法常见的做法是选择柔韧性配方的UV胶水;使得粘接的胶层控制均匀。还有就是初固时使用低功率的UV灯具,使胶水的固化的速度变慢,定位后在使用高功率的UV设备深度固化,因为胶水固化速度过快,会增加胶水的收缩率。
A common way to solve this problem is to choose a UV glue that is flexible in the formulation; this allows the glue layer to be evenly controlled. There is also the use of low-power UV lamps in the initial solidification, so that the curing speed of the glue is slowed down. After positioning, the high-power UV equipment is used for deep curing, because the glue curing speed is too fast, which will increase the shrinkage rate of the glue.

胶水固化后,胶体表面接触空气,由于空气的抑制作用,胶体表面不能脱粘,也就是粘手的现象。解决此问题的办法是用较高之紫外线强度和感光剂量,使用应较快的感光剂系统,和含365纳米波长的紫外光源。
After the glue is solidified, the surface of the colloid is in contact with the air. Due to the inhibition of the air, the surface of the colloid cannot be debonded, that is, the phenomenon of sticking hands. The solution to this problem is to use a higher UV intensity and sensitizer, a faster sensitizer system, and an ultraviolet source with a wavelength of 365 nm.

深圳市创盈时代科技有限公司是一家专注于平台点胶机,落地式点胶机,视觉点胶机,非标自动化设备的研发生产和销售于一体的国家高新技术点胶机厂家。

本文关键字:UV胶

原文地址:http://www.massagept.com/news/djjs/1796.html

本文由www.massagept.com 深圳创盈时代科技有限公司 自动点胶机整理,欢迎转载,转载时请标明出处。

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