57results about How to "Product quality indicators are stable" patented technology

The invention discloses a method for preparing an alternate layered biodegradable polymer barrier material with excellent water vapor and oxygen barrier properties. The method comprises the main content as follows: the water vapor barrier property and the stability of the barrier property on humidity are improved through adding hydrophobic substances to water vapor barrier layers, and the diffusion path of oxygen is increased to improve the oxygen barrier property through adding a filler with large specific surface area to an oxygen barrier layer; a multi-layer structure of which the water vapor barrier layers are arranged at the outmost layer and the internal oxygen barrier layer and the water vapor barrier layers are alternately arranged is designed by using a coextrusion system, thereby obtaining excellent water vapor and oxygen barrier properties and the stability of the properties on the humidity at the same time; dimensions and form structures of a disperse phase and the filler are optimized to further improve the barrier properties through stretching and shearing force fields in the coextrusion process, and meanwhile, the mechanical property is improved. The method is a continuous production process and is simple in process, products of different batches are stable in quality index, large-scale industrial production can be carried out, and the method has wide industrialization and market prospects, and is of great significance in theoretical research and application and development of a composite material.

The invention provides an embedded data acquisition system and method for GDM networks of SIMATIC TDC systems, and aims at solving the problem that the data acquisition of TDC systems in the prior artmust be realized through GDM network cards. The system comprises automatic control software FB-ACQ, a memory module MEM-ACQ, a single board computer and data acquisition software TACQ. The FB-ACQ isoperated on a TDC system controller, completes data acquisition for the TDC system controller according a period configured for the acquisition and stores the acquired data in a specific area MEM-ACQof a GDM; and the single board computer is inserted into a TDC system rack in an embedded manner, and completes the acquisition of real-time data and historical data through operating the TACQ. The embedded data acquisition system and method are capable of realizing the high-speed acquisition of GDM data of the TDC systems, ensuring the time precision of data acquisition, and ensuring that the cumulative time error of every 10000 sample values does not exceed 1 ms; and the fastest sampling period can reach 1 ms, up to 50 pieces TDC controller data can be acquired at the same time, and up to 2048 channels can be acquired at the same time.

The invention belongs to the field of chemical technology and specifically relates to a method for removing residual formic acid in epoxidized fatty acid methyl esters or epoxidized soybean oil by the use of a eutectic solvent. The method provided by the invention comprises the following specific steps: sending crude epoxidized fatty acid methyl esters or crude epoxidized soybean oil which contains 0.2-15wt% of formic acid and is obtained by a epoxidation process through a formic acid method into an extraction kettle, adding a certain amount of an extractant under the condition of stirring, stirring for a period of time, standing for layering, sending a material on the upper layer into a vacuum dehydration kettle for further dehydration and refining, pouring an extract on the lower layer into an extractant regeneration kettle; heating under the condition of pressure reduction to distill formic acid in the extract, recycling the formic acid steam after being condensed in a condenser, and sending residual extractant left in the extractant regeneration kettle into the extraction kettle for recycling. The method provided by the invention has advantages of no discharge of waste water, high formic acid removal rate, simple technological operation, environmental protection, safety and low cost, and is suitable for both small-scale device and large-scale device production.