Hyperbranched polyimide resin modified by TRIS (CAS77-86-1)
Automobile brake pads are generally composed of steel plates, bonded heat insulation layers and friction blocks. At present, the brake pads on the market mainly use phenolic resin and nitrile rubber, but phenolic resin is harmful to the environment, and the heat-resistant limit temperature is only about 250°C. When the temperature is too high, the thermal decomposition phenomenon is quite serious, which will affect the bonding strength of the friction block and the steel plate. In severe cases, the friction block will fall off. Therefore, it is necessary to find a new type of adhesive insulating material to replace phenolic resin.
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Polyimide is a high-performance polymer material that can be used for a long time in the temperature range of -240°C to 260°C. The long-term use temperature of thermosetting polyimide resin can be above 300°C, because this material is in a high temperature state. It has excellent thermal stability, chemical stability, mechanical properties and low dielectric constant, making it widely used in aerospace, electronics industry, automobile manufacturing and other fields. Hyperbranched polymers have the characteristics of a three-dimensional network structure, multiple active sites, low viscosity, and good fusion with the matrix. They have broad application prospects and have shown great promise in the fields of photovoltaic materials, coatings, adhesives, nanotechnology, and drug delivery. Application value.
In order to solve the problem that the bonding strength of the brake pad bonding heat insulation layer is reduced under high temperature conditions, the researchers provided a modified hyperbranched polyimide resin, the preparation method of which is as follows:
Step 1: Add triamine monomer (selected from one or more of TAPOB, TAPOB and TAP), dianhydride monomer (selected from one or more of 6FDA, PMDA, BPDA, ODPA, BTDA) and The solvent DMF was stirred and dissolved at room temperature, then heated to 60°C, and stirred under N2 for 24 hours to obtain a hyperbranched polyamic acid solution.
Step 2: Add tris(hydroxymethyl)aminomethane (TRIS) monomer to the hyperbranched polyamic acid solution obtained in the first step, and react at 60°C for 24 hours to obtain a modified hyperbranched polyamic acid solution with terminal hydroxyl groups .
The third step: After removing the solvent from the modified hyperbranched polyamic acid solution obtained in the second step, it is heated to 160° C. for 1 hour to carry out imidization and esterification reactions, and the water produced by the reaction is removed by N2. The modified hyperbranched polyimide resin is obtained.
The modified hyperbranched polyimide resin provided by the invention introduces TRIS (CAS77-86-1) monomer, which improves the mechanical properties and high temperature resistance of the hyperbranched polyimide. At the same time, the end of the hyperbranched resin contains a large number of hydroxyl groups, which can be cross-linked to form a stable system. Adhesives prepared by using TRIS modified hyperbranched polyimide resin can tightly bond the friction block and the steel plate, and the bonding strength does not decrease at high temperatures. Desheng is a professional TRIS manufacturer, and its quality has been recognized by many manufacturers. If you need to buy, please contact us!
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