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热熔胶环球软化点测定_同进资讯_热缩管_冷缩管_粘弹体防腐胶带_冷缩终端_冷缩电缆头【同进商城】
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首页 > 同进资讯 > 热熔胶环球软化点测定

热熔胶环球软化点测定

 热熔胶软化点是热熔胶-UV胶表征质量和工艺的性能指标,按GB/T 15332-94进行测定。
一、测定原理
把确定质量的钢球置于填满试样的金属环上,在规定的升温条件下,钢球进入试样,从一定的高度下落,当钢球触及底层金属挡板时的温度,视为软化点。
二、仪器和传热介质
①.软化点测定装置:其中钢球直径为9.53 mm,质量为(3.50±0.05)g;烧杯容量约为800 mL,直径90 mm,高度不小于140 mm。
②.瓷板:应光洁。
③.瓷坩埚:容量为50 mL。
④.传热介质:应不与被测试样起反应,如使用水浴、甘油浴或硅油浴。
三、试样制备
取一定量的实验室样品-UV胶放在瓷坩埚内,然后将瓷坩埚置于适当的传热介质中。加热样品至熔化,记录开始熔化的温度。继续加热使其完全熔化,直至其温度超过开始熔化的温度(25~50)℃。在熔化和升温的整个阶段应搅动试样,使其完全成为均匀且无气泡的液体。另外,把试样环加热到与熔化试样相同的温度,再将其放在瓷板上,为避免与其粘合,瓷板可稍微涂些甘油或硅油。
用足够量的熔化的试样填满试样环,使其在冷却之后稍有多余部分。在空气中冷却30 min,然后用稍加热的刀除去多余试样。
四、测定步骤
准备好仪器,悬挂好温度计,使温度计的底部位于试样环平面,并与两环的距离相等,调节环架成水平状。
①.软化点温度低于80 ℃的试样的测试
用比估计温度低10 ℃的蒸馏水装满容器,要浸没试样环,水面应高出试样环50 mm,在恒温的水浴中,这一温度应保持15 min,用夹钳把预先浸在水浴中达到同一温度的钢球放入钢球定位环上。
均匀升温,升温速度为(5±1)℃/min。加热水浴温度,直至钢球穿到试样环进入试料。凡是不按上述升温速度加热的所有试验都无效。
当被试料包围UV胶的钢球触及到环架的下承板时,要及时记录温度计所显示出的温度。
在试验过程中,如果试样发生连续降解的话,则可充入惰性气体或用其他方法进行测量。
②.软化点温度高于80 ℃的试样的测试
软化点温度高于80 ℃的试样制备和操作方法与软化点温度低于80 ℃的试样测试相同,但要使用甘油浴或硅油浴进行加热。
五、结果表示
实验结果用两次测定温度的平均值表示。

本公司生产的带胶热缩双壁管带胶中壁涂胶管热收缩带热收缩套都采用优质热熔胶。
对以上知识还不太清楚的朋友可以直接咨询冷热缩Jimmy。

本文版权归属苏州同进高分子材料有限公司,转载必须注明出处,请尊重本作者辛勤劳动。(www.uptogether.com.cn)

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