Unsaturated polyester resin (UPR) has good mechanical properties, electrical properties and chemical resistance, and is easy to obtain and inexpensive, and its composite materials are widely used in transportation, building materials, electronics and other industries, in the world for nearly 20 years. develop rapidly. With the development of science and technology and the demand of various applications, the requirements for the performance of unsaturated polyester resin (UPR) composite materials are getting higher and higher, and its development and application are also promoted. The China Unsaturated Resin Network (http://www.unsaturated.com.cn) expert introduced several recently developed and applied unsaturated polyester resins (UPRs), and reviewed the latest developments in the modification of unsaturated polyester (UPR) composites. UPR composites, research on surface, interface, low shrinkage and natural fiber, and inorganic reinforcement, focused on the preparation of unsaturated polyester (UPR) layered silicate nanocomposites And performance. The experts of China Unsaturated Resins Network (www.unsaturated resin nets) have introduced one by one: surface fluorination modification of UPR composites; interface modification of UPR/glass fiber composites; low shrinkage modification of UPR composites; natural fibers Reinforced; UPR/inorganic composites; UPR/lamellar silicate nanocomposites. 6. UPR/Layered Silicate Nanocomposites Because of the structure of the polymer/layered silicate nanocomposites, there are ultrafine nanophase sizes, large specific surface areas, and small distances between domains, there are special interactions, so its performance is comparable to the macroscopic or microscopic Graded composite materials (such as traditional inorganic filler-filled modified polymers) have a very significant increase, and even show entirely new properties and functions, such as high strength, high modulus, high toughness, high heat resistance, high barrier properties. , high dimensional stability, etc., as well as in the electrical properties, magnetic properties, optical properties, catalytic activity, biochemical properties, etc., present a wide range of excellent properties, so it has a wide range of application prospects, according to China unsaturated resin network () experts The introduction can be used as a new high-performance composite material widely used in various fields of national economy such as automobiles, transportation, household appliances, building materials, machinery, packaging, and other high-tech fields such as electronic information, biotechnology, aerospace, and new energy. Although the polymer/layered silicate nanocomposite has a promising market, there are still some factors that restrict its industrialization. According to experts from China Unsaturated Resin Network (http://www.unsaturated.com.cn), the first is the organic modification technology of layered silicate powders. That is, montmorillonite and other powders must be intercalated with small molecules before the nanocomposite with the polymer. In order to enlarge the layer spacing and change the hydrophobicity between the layers, it is beneficial to the intercalation modification of macromolecules. Melt intercalation is suitable for most thermoplastics, while thermosets are in-situ intercalated. For organic/inorganic nanocomposite unsaturated polyesters, it is desirable that the silicate sheet be completely stripped and uniformly dispersed in the matrix of the unsaturated polyester. (1) UPR/Silylated Montmorillonite Composites Yuan Jinfeng and others prepared unsaturated polyester/montmorillonite composites. The results showed that the addition of modified montmorillonite with a mass fraction of 0.02 to 0.03 greatly improved the properties of the material. Kornmann et al. studied unsaturated polyester/montmorillonite nanocomposites. The bentonite was first purified and activated with sodium ions to obtain montmorillonite. The activated montmorillonite is then treated with silane and mixed with unsaturated polyester to make nanocomposites. According to an expert from China Unsaturated Resin Web, the X-ray diffraction results showed that some of the layered silicates were stripped during the cross-linking of unsaturated polyesters. Transmission electron microscopy photographs show that the phyllosilicates are uniformly dispersed and partially stripped, and the polymer diffuses significantly into the silicate layers. It is possible that the silane treatment increases the montmorillonite and the moisture between the unsaturated polyesters. Sex. The results also show that Young's modulus increases with the increase of montmorillonite. The tensile strength did not change much, and the tensile strength decreased after the montmorillonite exceeded 0.04 (volume fraction). This is due to the interface between the layered silicate and the unsaturated polyester. Adding a small amount of montmorillonite can improve the brittleness of unsaturated polyesters. When the amount of montmorillonite is 0.15 (volume fraction), the fracture energy GQ of nanocomposites increases from 70J/m2 of pure unsaturated polyester to 138J/m2. , nearly doubled. Soft Microfiber Sheets,Soft Microfiber Bedding,Soft Microfiber Bedding Set,Polyester Soft Microfiber Bedding Changxing Xingang Textile Co.,Ltd , https://www.xingangtextile.com