Abstract: The present invention discloses a method for preparing a halogen-free low-smoke intrinsic flame-retardant nylon 66 composite material, which is implemented according to a conventional preparation process by taking an organic acid-modified metal hydroxide as a flame retardant. According to the present invention, an organic acid containing flame-retardant elements such as P, N and S is used for carrying out reactive modification on the metal hydroxide, so that the agglomeration behavior of the metal hydroxide in a polymer is effectively reduced, the compatibility between the flame retardant and nylon 66 is improved. Meanwhile, a series of flame-retardant functional groups such as P, N and S are introduced, so that the flame retardancy of the nylon 66 is greatly improved, the smoke suppression effect is achieved to a certain extent. Therefore, the prepared intrinsic nylon 66 composite material has desirable flame retardancy (an oxygen index can reach 25.8) and low smoke effect.

Abstract: Embodiments of the present disclosure provide an APB (Advanced Peripheral Bus) bus-based SPI (Serial Peripheral Interface) communication device. The device comprises: an APB interface module, an SPI bus interface module, an encryption module, and a decryption module, wherein the encryption module receives plaintext data and a key from a master via the APB interface module, generates, when enabled, ciphertext data according to the plaintext data and the key, and sends the ciphertext data to a slave via the SPI bus interface module; the decryption module receives the ciphertext data from the slave via the SPI bus interface module and receives a key from the master via the APB interface module, generates, when enabled, plaintext data according to the ciphertext data and the key, and sends the plaintext data to the master via the APB interface module. The present disclosure can improve the security of data transmission.

Abstract: The present invention discloses a method for preparing a functionalized organic magnesium salt. The method includes completely dissolving organic acid in distilled water to form an organic acid aqueous solution, adding an inorganic magnesium salt into the organic acid aqueous solution, magnetically stirring for 1-5 h at 70-100° C., removing distilled water, and performing vacuum drying to obtain a white powdery solid which is a functionalized organic magnesium salt. An intrinsic flame-retardant PET composite material prepared by using the functionalized organic magnesium salt as a flame retardant not only achieves the compatibility between inorganic particles and a matrix, but also solves the problem of poor flame retardant performance of PET plastics in the existing production process.

Abstract: Embodiments of the present disclosure provide an APB (Advanced Peripheral Bus) bus-based SPI (Serial Peripheral Interface) communication device. The device comprises: an APB interface module, an SPI bus interface module, an encryption module, and a decryption module, wherein the encryption module receives plaintext data and a key from a master via the APB interface module, generates, when enabled, ciphertext data according to the plaintext data and the key, and sends the ciphertext data to a slave via the SPI bus interface module; the decryption module receives the ciphertext data from the slave via the SPI bus interface module and receives a key from the master via the APB interface module, generates, when enabled, plaintext data according to the ciphertext data and the key, and sends the plaintext data to the master via the APB interface module. The present disclosure can improve the security of data transmission.