Step-temperature closed emission method for simultaneous determination of formaldehyde emission characteristic parameters of building materials at multiple temperatures

Abstract

The invention relates to a step-temperature closed emission method for simultaneous determination of formaldehyde emission characteristic parameters of building materials at multiple temperatures. Based on a adsorption potential theory and a Henry's law, a functional relationship between a separation coefficient K and an initial dissipative concentration C0 is established, and an analytical formula of the equilibrium concentration Cequ of formaldehyde in the closed environment is derived. A sealed environment cabin is used to maintain a constant temperature and a humidity space, and the building material samples are subjected to formaldehyde emission test, and the formaldehyde hourly concentration and equilibrium concentration at the initial temperature are measured. The temperature is then raised and the corresponding new equilibrium concentration is measured. The above operations can be repeated in sequence to obtain a formaldehyde equilibrium concentration value at multiple temperatures. The nonlinear fitting is carried out on the formaldehyde hourly concentration at the initial temperature, the K at the temperature can be determined. When the Cequ of the building material at other temperatures is known, the K at the corresponding temperature can be quickly obtained by the ratio of the equilibrium concentrations, and the corresponding C0 can be calculated. The method greatlyimproves the measurement efficiency of formaldehyde emission characteristics.

Description

technical field [0001] The invention belongs to the field of indoor environmental quality detection, in particular to a step temperature-rise airtight emission method for simultaneously measuring formaldehyde emission characteristic parameters of building materials at multiple temperatures. Background technique [0002] The requirements for interior decoration in modern buildings are increasing day by day. The extensive use of decoration materials and wood-based panel furniture leads to excessive emission of indoor harmful substances; Promote the accumulation of pollutants in the indoor air, causing its concentration to seriously exceed the standard. Artificial boards such as density boards and particle boards are widely used in interior decoration, and urea-formaldehyde resins and phenolic resins are used in large quantities in the production process of these boards to maintain their structure and processing performance. Formaldehyde, as the main component of urea-formalde...

AI Technical Summary

Problems solved by technology

Researchers have proposed a large number of ingenious experimental methods to measure these two parameters, such as multi-gas-solid ratio method, multiple emission regression method, closed direct current intermittent emission method, etc., but these methods require the measurement of multiple emission cycles The value of the emission characteristic parameters can be determined only when the experiment takes a long time

The C-history method can simultaneously obtain the values ​​of three emission characteristic parameters by measuring the VOC concentration in one emission period, but this method involves many intermediate parameters and the calculation process is more complicated; and when fitting the experimental data, it needs to be checked The validity of the value range of the experimental data, the results of the experimental data in different time ranges are very different

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