Boron/cardanol/nano-material modified phenolic resin material and preparation method therefor

Abstract

The invention belongs to the field of modified phenolic resin, specifically relates to a boron / cardanol / nano-material modified phenolic resin material and a preparation method therefor. The boron / cardanol / nano-material modified phenolic resin material is prepared by using the following method: (1) implementing refluxing and water separation reaction on cardanol, a catalyst, borate and a water-taking reagent at 100-130 DEG C for 0.5-5 hours, then adding phenol in portions and continuing the reaction for 1-5 hours; raising the temperature to 130-150 DEG C, and distilling part of the water-taking reagent; and (2) adding paraformaldehyde, a nano-material and the catalyst into a reactant obtained in step (1), implementing refluxing and water separation reaction at 100-130 DEG C for 1-5 hours, raising the temperature to 140 DEG.C, distilling the remaining water-taking reagent, discharging the product to obtain the boron / cardanol / nano-material modified phenolic resin material. The boron / cardanol / nano-material modified phenolic resin material has excellent thermal stability, mechanical properties and friction properties, and can be applied to the field of friction materials.

Description

technical field [0001] The invention belongs to the modification field of phenolic resin, and in particular relates to a boron / cardanol / nano material modified phenolic resin material and a preparation method thereof. Background technique [0002] As one of the three synthetic thermosetting resins, phenolic resin has easy to obtain raw materials, convenient synthesis, low price, good mechanical properties, weather resistance, corrosion resistance, water resistance and certain heat resistance, and is widely used in transportation , aviation industry, military equipment, electronic appliances and other industries. However, with the development of industry, especially technological innovations such as the automobile industry and high-speed trains, new requirements have been put forward for high-performance phenolic resins. The traditional pure phenolic resin is easy to oxidize due to the easily oxidized phenolic hydroxyl group and methylene group, and its heat resistance is aff...

AI Technical Summary

Problems solved by technology

Boron-modified phenolic resin has not been widely used in China so far. The important reason is that the above three methods have the following shortcomings: the esterification reaction of boric acid in the boric acid phenolic ester method is relatively difficult, the reaction conditions are relatively harsh, and the reaction between boric acid phenolic ester and aldehyde If formaldehyde aqueous solution is used, boric acid phenol ester is easy to hydrolyze, and the modification effect is limited. If paraformaldehyde is used, the viscosity of the system is very high, mass and heat transfer are difficult, the reaction process is difficult to control, and it is easy to detonate and form water. Causes the hydrolysis of boric acid phenol ester; the salicyl alcohol method has a large viscosity in the later stage of the reaction, which is difficult to control; the blending method of boric acid and phenolic resin is physically mixed, and there is obvious microphase separation, and the interaction between the two phases is poor, easy to A large "sea island" structure is formed, and the incompatibility between the two at the segment level or molecular level prevents the mixed reactants from fully contacting and fully reacting, and the reaction time between boron and phenolic resin is relatively short during the thermocompression molding process. Short, incomplete reaction, limited modification effect

However, the current cardanol-modified phenolic resin has problems such as low cardanol activity, incomplete reaction, and low molecular weight of the phenolic resin, which restricts its performance improvement.

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