Modified hot setting resin and preparation method thereof

Abstract

The invention discloses a modified hot setting resin and a preparation method thereof. In parts by weight, the modified hot setting resin is obtained by evenly mixing 100 parts of hot setting resin, 0-100 parts of curing agent, 0-1 part of curing catalyzer, and 1-100 parts of hyperbranched silicon resin containing active functional groups at the temperature of 30-200 DEG C. The modified hot setting resin has high storage stability, processability and reactiveness and sufficiently integrates the performance advantages of hyperbranched polymer and polysiloxane, and thereby the obtained modified hot setting resin has high tenacity, more prominent thermostability and excellent dielectrical property as well as damp heat resistance. The preparation method of the modified hot setting resin has wide applicability, simple operating process and easy molding.

Description

technical field [0001] The invention relates to a modified thermosetting resin and a preparation method thereof. Background technique [0002] Thermosetting resins are a class of polymer compounds with a crosslinked network structure. They generally have good mechanical, electrical and bonding properties, and are often widely used in the technical fields of machinery, chemical industry, electronics and aerospace in the form of adhesives, coatings, sealants, potting materials and resin matrices for composite materials. . The main representative ones are epoxy resin, phenolic resin, unsaturated polyester and polyurethane. [0003] The rapid development of modern industry has put forward higher and more performance requirements for materials, mainly in more prominent thermal stability, better dielectric properties, better toughness, lower water absorption and better molding process sex. However, thermosetting resins have problems such as brittleness after curing, poor impac...

AI Technical Summary

Problems solved by technology

[0004] At present, rubber elastomers, thermoplastic resins, thermosetting resins, and inorganic rigid particles are mainly used to modify them, but the modification results are still insufficient; such as rubber elastomers modifying thermosetting resins, the increase in toughness will be accompanied by strength, mold, etc. The reduction of weight and heat resistance; thermosetting resin modified thermosetting resin, the toughness improvement is not significant; thermoplastic resin modified thermosetting resin, there are disadvantages such as poor manufacturability and complicated preparation process

[0006] However, studies have found that a large number of alkoxy groups and hydroxyl groups remain in the existing hyperbranched polysiloxane prepared by controlled hydrolysis, so it is easy to undergo further polymerization over time, thereby reducing the polymer's Storage stability; At the same time, the existence of a large amount of active groups has greatly improved the polarity of hyperbranched polysiloxane, so that its solubility and compatibility with thermosetting resins are poor (as insoluble in toluene and other low ( or non-polar solvents, poor compatibility with epoxy resin or silicone resin), and this modified thermosetting resin system is easy to release small molecules (methanol, ethanol or water molecules) during the molding process. Therefore, the existing HBPSi modified thermosetting resin has the problems of low storage stability, phase tolerance, complex molding process, and the advantages of HBPSi cannot be fully utilized.

Images