Experiment system for determining proton transfer characteristic parameters of building material surface barrier layer

Abstract

The invention relates to an experiment system for determining proton transfer characteristic parameters of a building material surface barrier layer, belonging to the indoor environment testing field.The experiment system comprises a compressed gas cylinder, a flow controller, a gas distributing chamber, a static environment cabin, a proton transfer reaction mass spectrometer and a bypass; the gas distributing chamber and the static environment cabin are in upper and lower placement; two opposite air inlets are arranged at the top wall circumference of the gas distribution chamber, an air outlet is arranged in the middle of the top wall, and a bottom is in a shape of an opening; a stirring fan is installed at the bottom of the static environment cabin, and an opening having the same sizeas a gas distribution chamber opening and a sampling hole are arranged at the top of the static environment cabin; the flow controller is connected between the compressed gas cylinder and the air inlet of the gas distribution chamber by a connecting pipeline; the proton transfer reaction mass spectrometer and the bypass for discharging surplus gas are respectively connected with the air outlet ofthe gas distribution chamber by the connecting pipeline; and the sampling hole of the static environment cabin is also connected with the proton transfer reaction mass spectrometer by the connecting pipeline. The experiment system has high testing precision and sensitivity, short reaction time and simple operation.

Description

technical field [0001] The invention belongs to the field of indoor environment inspection, in particular to an experimental system for measuring the mass transfer characteristic parameters of the barrier layer on the surface of building materials. Background technique [0002] Many indoor building materials such as carpets, wood-based panels, etc. will release a large amount of volatile organic compounds (VOC). VOCs seriously negatively affect people's comfort, health and work efficiency. Therefore, how to effectively control the VOC emission of building materials has received more and more attention. Among them, covering the surface of building materials with a barrier layer (such as impregnated paper, PVC film, paint, etc.) is considered to be a relatively promising method. However, there is little work on the determination of mass transfer characteristic parameters of common barrier layers, including diffusion coefficient and separation coefficient. This makes it diff...

AI Technical Summary

Problems solved by technology

Its shortcoming is that there is a risk of multiple solutions, making the result uncertain

At the same time, the volume of the environmental chamber used in the double chamber method is generally large (30L-1m 3 ), the test sensitivity is relatively low

In addition, traditional VOC testing instruments (such as gas chromatograph GC) have large sampling volume and long test time intervals, which cannot meet the requirements of rapid detection of VOC concentration changes.

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