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Study on Preparation and Application of Heat-resistant Additives for Insulating Paper
Received:May 11, 2020  
DOI：10.11980/j.issn.0254-508X.2020.10.003
Key Words:blocked waterborne polyurethane  heat-resistant additive  insulating paper  thermal aging
Fund Project:国家重点研发计划项目(2017YFB0308200)。
Author NameAffiliationPostcode
MAO Cui China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
MENG Fanjin China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
LIU Wen China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
CAO Qingfu China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
LI Huanhuan China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
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Abstract:A blocked waterborne polyurethane （WPU） heat-resistant additive was synthesized with methyl-ketoxime as blocking agent， isophorone diisocyanate and polyethylene glycol 400 as the main raw materials. The molecular structure of the WPU was characterized by FT-IR. The WPU was applied to the impregnation treatment of insulating paper to produce heat-resistant insulating paper. The thermal aging experiments of untreated insulating paper and WPU-treated insulating paper were conducted at 150℃ for 0～168 h. Then the tensile strength， polymerization degree of the cellulose and fiber surface morphology of the insulating paper before and after the thermal aging were studied. The results showed that the CPU deblocks at 130℃ and releases the isocyanate group which reacted with the cellulose hydroxyl group to form the crosslinked network structure between the WPU and the fiber.In the process of thermal aging， the cellulose polymerization degree of WPU-treated insulating paper was lower than that of untreated insulating paper， and the loss rate of tensile strength decreased from 38.5% to 19.8%， WPU could significantly improve the thermal aging resistance of insulating paper.
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