Yellowing-resistant polyurethane for polishing pad and preparation process of yellowing-resistant polyurethane

• Main Authors: ZHAO CHAOYANG, GAO YU, SONG YUNLONG, ZHANG YI, QI WENBIN
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS; GENERAL PROCESSES OF COMPOUNDING; GRINDING; MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; POLISHING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The invention relates to the technical field of polyurethane for polishing pads, in particular to yellowing-resistant polyurethane for polishing pads and a preparation process thereof.The preparation process comprises the following steps that diisocyanate, polyether polyol and a chain extender are mixed, the temperature is slowly increased to 75-85 DEG C, a heat preservation reaction is conducted for 2-3 h, and a prepolymer is obtained; adding nano silicon dioxide, a foaming agent, a foam homogenizing agent and a plasticizer, and mixing; a curing agent is added, the mixture is poured into a mold, and the mold is placed at the temperature of 102-108 DEG C for thermocuring; demolding is conducted; placing at the temperature of 102 to 108 DEG C, and curing for 15 to 16 hours; and placing at room temperature for 7 days to obtain the polyurethane for the polishing pad. According to the polyurethane for the polishing pad, norbornene dianhydride is introduced through polyether polyol, caprolactam is added for reacti