随放置时间延长聚氨酯密封胶对粘接组件中VOC的释放影响

发布时间 : 2022-10-30 15:15:07
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

随放置时间延长聚氨酯密封胶对粘接组件中VOC的释放影响

(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

发布时间 : 2022-10-30 15:15:07
Views:

为了进一步探究随放置时间的延长，聚氨酯密封胶在粘接组件中的VOC释放情况，我们选取上述A组和B组部件材料进一步进行放置7d和21d后试验，其TVOC含量变化情况如表2所示。

由表2测试结果可知:

聚氨酯密封胶a和b放置7d时的TVOC含量分别较制样1d时下降了98.0%和88.0%，运远高于相应地板组件a和防寒材组件b中TVOC的下降量(}L4%和32.5% )，这是由于粘接组件中聚氨酯密封胶表面被覆盖，阻挡了VOC的释放。

放置21d后，地板组件a与防寒材组件b的TVOC含量仍远高于相应地板a、地板布a及防寒材b的，因此从TVOC含量角度来说，聚氨酯密封胶对地板组件a与防寒材组件b中VOC的影响仍较大。

地板组件a放置21d后TVOC含量只下降了9.3 %，远远小于防寒材组件b的TVOC下降量59.0%，可能是由于地板布相比防寒材更加致密，聚氨酯密封胶被地板布覆盖后，其释放速率更慢。

此外，我们对地板组件a、防寒材组件b及其组成材料的主要释放物质也进行了跟踪测试分析，测试结果如表3所示。

再由表3测试结果可知:

A组试验放置7d和21d后，地板组件a中主要释放物质仍是甲苯和乙酸乙醋，与制样1d时一致(占比也接近)，同时也与聚氨酯密封胶a中主要释放物质种类和占比一致，而地板a与地板布a中主要释放物质种类也与制样1d时一致(即与地板组件a不一致)，进一步说明地板组件a中主要释放物质来源一直是聚氨酯密封胶。www.sdyuantai.com

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