UV光固化-单官能团活性稀释剂的特点分析

单官能团活性稀释剂每个分子中仅含一个可参与光固化反应的活性基团,分子量较低,因此具有如下的特点
①黏度低稀释能力强
②密固化速率俄,这是因为单官能团活性稀释剂的反应基团含量低,导致光固化速率低。
③交联密度低,只含一个光活性基团,因此在光固化反应中不会产生交联点,使反应体系交联密度下降。
④转化率高)由于单官能团活性稀释剂的碳碳双键的含量低,黏度小,容易参与聚合故转化率高。
⑤(体积收缩率低,在自由基加成聚合时,碳碳双键转化成单键,分子间距变小,密增大,造成体积收缩。但单官能团活性稀释剂因碳碳双键含量低,所以体积收缩较少。
⑥挥发性较大,气味大、易燃,毒性也相对较大

Single functional group active diluent contains only one active group that can participate in the UV curing reaction in each molecule, which has low molecular weight, so it has the following characteristics

① Low viscosity and strong dilution ability

② The reason for the low curing rate is that the reactive group content of the active diluent with single functional group is low.

③ Because of the low crosslinking density and only one photo active group, there is no crosslinking point in the UV curing reaction, which makes the crosslinking density of the reaction system decrease.

④ High conversion) due to the low content of carbon carbon double bond and low viscosity of single functional group active diluent, it is easy to participate in polymerization, so the conversion is high.

⑤ (the volume shrinkage is low. In the free radical addition polymerization, the double bond of carbon and carbon is converted into a single bond, and the molecular spacing becomes smaller and denser, resulting in volume shrinkage. However, due to the low content of carbon carbon double bond, the volume shrinkage of single functional group active diluent is less.

⑥ Volatile, odorous, flammable and toxic