News on December 6, 2023, according to an announcement from the State Intellectual Property Office, Nantong Tongyi Aerospace Technology Co., Ltd. obtained a patent titled “A thermal insulation polyurethane protective film and its preparation method” , authorization announcement number CN116948231B, application date is September 2023.
The patent abstract shows that the present invention relates to a heat-insulating polyurethane protective film and a preparation method thereof, and belongs to the technical field of heat-insulating films. The method includes the following steps: 1) Clean and heat-dry ABS waste to obtain pre-treated ABS waste; 2) Stir and mix TPU, pre-treated ABS waste, modified powder, coupling agent and antioxidant to obtain Mixture; 3) After melting and blending the mixture and toughening agent, cooling, granulating, and drying, material A is obtained; 4) After melting and blending clean HIPS waste and ZDMA, cooling, granulating, and drying, obtaining Material B; 5) After melting, blending, cooling, granulating, and tape-casting materials A and B, a heat-insulating polyurethane protective film is obtained. The present invention realizes the recycling of ABS waste and HIPS waste, and significantly improves the performance of the protective film by introducing ZDMA and SBG-001 and using a two-step hot-melt blending extrusion method.
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