This paper describes the comparison of the amount of formaldehyde released under the same conditions between finger-jointed solid wood furniture and splint-based panel furniture in a three-bedroom, one-bedroom suite of the same structure and area.
Since the data on the amount of formaldehyde released from the fingerboard and splint of the fir is determined by the dryer method, a method for measuring the amount of formaldehyde released by the dryer method will be described first.
The test piece was sawed into a specification of 150 mm × 50 mm, a total of 10 pieces. It was placed in a 9-11 L desiccator on the same day, and 20 mL of distilled water was placed in the absorption vessel and placed at the bottom of the detection vessel. After being placed at room temperature of 20 ° C for 24 hours, it was taken out, and the amount of formaldehyde released was measured according to the provisions of 4.11 of GB/T17657-1999. After that, the test pieces were retained. After the test piece was sawed for 4 days, the test piece was placed in a desiccator, and the amount of formaldehyde released was measured 24 hours later. The amount of formaldehyde released was the amount of formaldehyde released from the test piece (distilled water).
It is assumed that in the same suite 90m2, the total volume is 315m3 according to the current floor height of 3.5m, and the wall and furniture volume are about 290m3. According to the decoration habits of ordinary households nowadays, the splint used for ceiling and floor paving is not used. The amount of splint used is 70 pieces = 210 m2, and the actual loss of the interface is 170 m2 in the air.
Assume that the material used to build the furniture is the fir finger joint board, and the formaldehyde emission is 0.5 mg/L. Under the same conditions as the formaldehyde content measured by the dryer method within 24 hours, the calculated formaldehyde emission amount is 0.1333mg/m2, multiplied by 170333m with 0.1333mg/m2 and then divided by 290m3 to obtain the concentration of formaldehyde in the air is 0.078. Mg / m3 <0.08mg / m3 (China's national standards stipulate the maximum allowable concentration of formaldehyde in the air).
Assume that the material used to build the furniture is the splint. The splint on the market generally claims to have a formaldehyde emission of E1 (E1 ≤ 1.5 mg/L), but in fact it is mostly E2 (E2 ≤ 5 mg/L). Assuming that the formaldehyde emission is 5 mg/L, the concentration of formaldehyde in the gas is calculated as 0.78 mg/m3>0.08 mg/m3 (the highest allowable concentration of formaldehyde in air in China), 0.78 mg/m3=0.312. Ppm.
From the above analysis, the furniture made mainly by splint is used. If the formaldehyde content in the room is seriously exceeded after 24 hours in a sealed environment, the furniture made mainly of fir finger joints is also in a safe state under the same conditions. Of course, the actual situation of real life installation, the average family will not be closed in 24h, if the environment is exposed to high formaldehyde for a long time, it will cause serious damage to the human body.
The long-term release of aldehydes is generally 5-10 years, and some even exceed 15 years. The amount of formaldehyde released has a lot to do with temperature, humidity and moisture. The amount of formaldehyde released increases in indoor environments where the temperature is high or the humidity is high. In general, the amount of formaldehyde released over time, the amount of formaldehyde released continuously decreases. Until the free formaldehyde in the furniture is completely released. According to the amount of glue applied, the amount of glue applied to the splint is more than 10 times that of the fingerboard of the fir. At the same time, the free formaldehyde of the glue used in the fingerboard of the fir finger joint is less than the free formaldehyde of the urea resin used in the splint. The time to release all is shorter than the splint. It can reduce the period of injury to the human body.
How to reduce indoor formaldehyde damage to the human body? To reduce the harm of formaldehyde to the human body, firstly, the material with low formaldehyde emission is selected as the main material for home decoration. Do not enter the home for half a year after renovation, at least one month. Because the amount of formaldehyde released indoors is at its peak during the first half of the year. Keep the room in a ventilated environment. If there is no such condition (such as in an air-conditioned environment in summer), keep the room ventilated for 1~2h. Plants that absorb formaldehyde can also be planted, such as Boston fern, ivy, spider plant, aloe vera, agave, and tiger-tail orchid.
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