Polymer foamed sheet and manufacturing method and application thereof

• Main Authors: WEI QIONG, ZHANG XIN
• Format: Patent
• Language: Chinese; English
• Published: 07.04.2023
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention discloses a polymer foamed sheet as well as a manufacturing method and application thereof. The overall structure of the polymer foaming sheet is a gas/solid two-phase composite material with irradiation cross-linked polymer as a continuous phase and bubbles composed of gas molecules as a dispersed phase, the VA content of the continuous phase is smaller than 8%, the volume fraction of nitrogen in the dispersed phase gas molecules is larger than 60%, and the volume fraction of ammonia is smaller than 3%. The surface structure meets the following conditions: the transverse-longitudinal ratio Str of the surface character is greater than 0.6; the maximum valley depth Sv is less than 20 microns; the polymer foaming sheet disclosed by the invention is applied to portable electronic products and intelligent wearable equipment, has sealing, dustproof and waterproof effects, can pass tests of extreme use environments such as high and low temperatures, dust and water vapor, and can meet the narrow frame