Flame-retardant bismaleimide resin and preparation method thereof

Abstract

The invention discloses flame-retardant bismaleimide resin and a preparation method thereof. The flame-retardant bismaleimide resin is prepared by uniformly mixing 100 weight parts of bismaleimide resin, 0 to 200 weight parts of allyl compound and 1 to 100 weight parts of amino functional group-containing polysiloxane at the temperature of between 90 and 200 DEG C. The resin has high flame retardance, toughness, heat resistance and dielectric property, can be used as a high-performance resin matrix, an adhesive, an insulating varnish and the like, has great application prospect in the highly technical fields of aerospace, electronic and electrical appliances, transportation and the like; and the preparation method of the resin has the characteristics of high applicability, environmental friendliness, simple operation process and the like.

Description

technical field [0001] The invention relates to a flame-retardant polymer material and a preparation method thereof, in particular to a flame-retardant bismaleimide resin and a preparation method thereof. Background technique [0002] Bismaleimide (BMI) is a class of bifunctional compounds with active end groups of double bonds. It has excellent high temperature resistance, radiation resistance, heat and humidity resistance, and good mechanical and electrical properties. It has been widely used in Aerospace, mechatronics, transportation and other fields. However, bismaleimide resin has the disadvantages of high brittleness and poor molding process, so it needs to be toughened and modified when it is used. There are mainly two kinds of existing toughening methods, one is to add diamines to extend the chain first, and then add epoxy resin, rubber, etc. to copolymerize with them; the other method is to copolymerize with diene compounds, which can greatly improve the toughness....

AI Technical Summary

Problems solved by technology

So far, the proposed modification methods mainly include: 1) Using the reaction of silanol and the active double bond of BMI or N-(4-hydroxyphenyl)maleimide to introduce the siloxane chain into bismaleimide Molecular structure, in order to achieve the purpose of modification through the prepolymerization reaction of the two, but the activity of the above reaction is not so high that the method is difficult, and because of the need to use a large amount of organic solvents, it is not suitable for environmentally friendly materials with increasing awareness of environmental protection development; 2) through NH 2 The Mike addition reaction between the end-capped polydimethylsiloxane and the active double bond of BMI realizes the modification of polysiloxane to BMI resin. This method improves the toughness of BMI resin and gives it a certain flame retardancy, but Due to the linear structure of polydimethylsiloxane, the thermal stability (glass transition temperature) and rigidity of the modified BMI are significantly reduced, and the flame-retardant modification effect of polysiloxane has not been fully reflected;3 ) using polysiloxane-modified BMI resins containing active aliphatic functional groups (epoxy groups or methacryloxy groups), this method improves its toughness, heat and humidity resistance and the compatibility of the two; but a large number The long-chain aliphatic polar groups also lead to higher dielectric constant and loss, lower heat resistance, and no significant improvement in flame retardancy

[0007] Based on the above, it can be seen that a common phenomenon in these existing modification methods is that it is difficult to modify on the basis of effectively synthesizing the respective advantages of polysiloxane and BMI resin

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