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May 10, 2023
Adding block copolymers based on silica fired epoxy to the blend of organic silicon and epoxy resin is due to its unique structure. This block copolymer can promote the penetration between resins and improve compatibility. Adding a block copolymer of silica fired epoxy group to a blend of bisphenol A epoxy resin and room temperature vulcanized polysiloxane (RTV) resulted in a decrease in interfacial tension between the epoxy resin and the silicone resin due to the presence of the block copolymer. At this time, the block copolymer acts as a surface active agent, causing RTV to disperse in the epoxy resin as particles. The smaller the particle, the greater its toughness. And it forms a protective layer on the surface of the silicone resin, thereby improving its waterproof and oil resistant performance. The compatibility between the two can be effectively improved by adding methods with transition phase functions.
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Meanwhile, it is precisely by utilizing polymer incompatibility that Funke proposed the concept of self layered (phase) coatings. It is composed of two or more incompatible polymers. After a single application of the coating on the ground material, it can spontaneously and directly generate phase separation. During the film forming process, it is divided into two or more consecutive coatings with different functions, forming a composite coating system with different compositions. Each layer displays different characteristics, which can achieve multiple layers of coating film in one application, greatly reducing coating time and cost, and reducing coating loss; And the coating film has many advantages of resin, without the problem of poor interlayer adhesion, and its performance is better than that of coatings applied in the same way. A self layered epoxy organic silicon coating was prepared, and characterized by scanning electron microscopy and infrared FTIR ATR. The top of the coating is pure organic silicon without epoxy; The bottom of the coating is an epoxy layer, but it contains trace amounts of organic silicon.
A series of polymer coupling agents (APCA) have been synthesized as modifiers for bisphenol A epoxy resin (EP). The results indicate that APCA can significantly improve the performance of the curing system. Among them, epoxy resin modified by 10 parts of APCA-60 showed a nearly double increase in impact strength and a 94% increase in elongation at break compared to unmodified epoxy 55%, and the tensile strength also increased by 59 55%, and the glass transition temperature also increased by 5 ℃, achieving significant reinforcement, toughening, and improved heat resistance.
The effect of different silicon burning coupling agents on epoxy modified silicone resin was studied. The research structure showed that the performance of KH-560 modified silicone resin was better than other coupling agents, because the hydroxyl group on KH-560 molecule can react with the epoxy group and end tibial group of epoxy resin, as well as the tibial group of silicone resin. This greatly improves the compatibility between epoxy resin and silicone resin, greatly reducing the internal stress of the system.
Using polymethylphenylsiloxane (PMPS) as a modification component, modification experiments were conducted on epoxy resin. The samples obtained by mechanical blending method can be observed under a 7000 times TEM microscope to have coarse PMPS dispersed in the epoxy resin matrix, forming an island structure. The resin modified by chemical methods only observed a very fine two-phase separation structure at 23000 times TEM. From the surface morphology analysis of the two resin coatings, it can be seen that the boundary between the PMPS dispersed phase and the E-20 matrix in the mechanically blended sample is clear, and the interaction force between the two phases is poor. However, the chemically modified resin has a fuzzy boundary between the two phases, and there is a good bonding force between the two phases. The dispersed phase of PMPS is connected to the matrix through Si-0-C bonding, forming an interpenetrating network between the two phases, increasing their compatibility.
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