Activated carbon Effect of urea formaldehyde adhesive on properties of Eurosone board
Wood is a kind of building and engineering material, because it has the characteristics of good insulator, easy processing, beautiful appearance, and will not cause any harm to human beings or the environment during and after the service life. Adding adhesive can transform wood chips into products such as Europine board and particleboard. Ousong board was born to use a large number of wood materials, such as sawdust, shavings, and other factory residues produced by the wood industry. It is widely used in manufacturing furniture, cabinets and various structural products. At present, the Ousong board industry can no longer meet the market demand. Therefore, people begin to use filler materials, which can not only save raw materials, but also use artificial boards in different fields. This study investigated different proportions of activated carbon (0% 、 1.5% 、 4.5% 、 7.5%) The influence on the performance of Eurozone board.
Ousong board production
The wood chips obtained from the Ousong board factory produce single-layer Ousong boards. Before gluing, dry the wood chips to moisture content 1% to 3% And stored in a sealed plastic bag to prevent exposure to the air. The solid content used in this study is 65% Ultrafiltration of. Based on the dry matter content of the adhesive, the activated carbon shall be 1.5% 、 4.5% and 7.5% The concentration of 600rpm Lower mixing thirty minute. 22℃ The viscosity of adhesive is 0% Activated carbon, 242±4 、 1.5% Activated carbon: 255±3 、 4.5% Activated carbon: 267±6 and 7.5% Activated carbon: 271±5 。 Use the adhesive spray gun in the drum mixer to apply the adhesive. Then, use the wooden paving mold to carry out the manual paving process, and put the plate assembly into the four hundred × four hundred × 12mm In the hot press. Each group produces three Ousong boards. After the pressing process, cool the obtained plate and adjust it to relative humidity 65±5% And temperature 20±2℃ To balance the moisture content. The sample is then extracted to determine the properties of the sheet.
Addition of activated carbon
With the increase of the content of activated carbon in the Ousong board, it plays the role of filling material, filling the voids or pores in the material. This can be used as a barrier to prevent the movement of water in the Europine board, thus preventing the entry and absorption of water, thus reducing water content. On the other hand, activated carbon particles combine with wood particles to form a more waterproof matrix and reduce WA 。 The addition of activated carbon may change the overall structure and density distribution of the board. These modifications affect the way water is absorbed and distributed throughout the material, resulting in TS and WA The value has changed. It is said that in wood composites, the hydrophobicity of glass wool and carbon fiber causes WA Value and thickness expansion ratio decrease. On the other hand MDF Active carbon added in twenty-four The range of swelling rate after hours is 15.7% to 22.4% ， WA The range of values is 88% to 75% 。 Akin and Boyaci (2021) It was found that MDF Of TS Ratio and WA Values in 19.46% and 22.01% and 45% and 53% between.
Color measurement plays an important role in evaluating the color characteristics of wood materials and monitoring color changes. This method is very important to maintain the beauty of materials and ensure the quality control in the production process. chart one We can observe the color change of the Ousong board produced by different proportion of activated carbon.
chart one : Ousong board with different activated carbon addition ratio: (a)0% ， (b)1.5% ， (c)4.5% ， (d)7.5% 。
It can be seen from the data that the color characteristics of the Ousong board are affected by AC Influence of content proportion. With the increase of activated carbon content, brightness (L) And yellow and blue ingredients (b) Down. The results showed that compared with the control group (0% Activated carbon ) In contrast, the addition of activated carbon reduces the red and green components (a) 。 chromatic aberration ( Δ E) It also increases with the increase of the proportion of activated carbon content, indicating that with the addition of more activated carbon, the Ousong board becomes darker and less yellow ( chart 2d) 。 When activated carbon is added to the composite, the color of the composite will change. Therefore, when using activated carbon as an additive, we should consider the trade-off between the function and aesthetic characteristics of the Eurozone board.
Using a scanning electron microscope (SEM) stay × five hundred Check the microstructure of the Eurosone plate under the magnification, as shown in the figure two As shown in.
chart two : The magnification of Ousong board is five hundred Times SEM Image: (a)0.0% ， (b)1.5% ， (c)4.5% ， (d)7.5% 。
Activated carbon reinforced SEM The analysis shows that the activated carbon is evenly distributed in the matrix and adhesive of Eurozone board ( chart 2a-d) 。 With the increase of the percentage of activated carbon, the activated carbon particles begin to fill the gap between the wood chips ( chart 2d) 。 However, there was no caking due to the amount of activated carbon used, nor did it affect the mechanical properties of the Ousong board. Fillers are added to the composite to enhance the mechanical properties and surface quality of the composite by filling the voids in the polymer chain.
Thermal properties of oxon plate
The low thermal conductivity of Eursund plate is one of the important characteristics required for indoor application. It is used to obtain the thermal conductivity of the Euzon plate by the transient hot wire method.
The results show that the thermal conductivity of the plate decreases with the increase of the amount of activated carbon. add to 4.5% The thermal conductivity of the activated carbon plate is low (0.2155) , compared with the Eurozone board without activated carbon (0.3479) Low Approx 38% 。 These results show that the activated carbon can improve the thermal insulation performance of the Eurozone board by reducing the heat transfer of the material. 7.5% Thermal conductivity of the activated carbon Euzon plate (0.2177) higher than 4.5% Ohsong board of activated carbon. The thermal conductivity of a material is proportional to its density. Previous studies have reported similar trends for other granular composites with different types of fillers, such as graphite, aluminum nitride, and aluminum. However, the thermal conductivity of the Euzon plate containing activated carbon in this study is lower than that of other reported composites with similar filler content. Activated carbon is a good thermal insulator with macroporous and microporous structure. The thermal conductivity of activated carbon is 0.05W/mK and 0.10W/mK Change between. The thermal conductivity of wood-based panels is affected by many factors, such as the stacking density of wood chips, the size and direction of wood chips, the type of raw materials and wood, the density of panels, water content, number of layers and porosity. In addition, when determining the thermal conductivity, factors such as test method and ambient temperature will also affect the obtained value. Therefore, it is expected that the commercially produced layered Eurosonian plates will show different thermal conductivity values compared with the laboratory made single-layer Eurosonian plates, resulting in a more uniform structure. In this study, the effect of activated carbon was studied by comparing it with the Eurosonian plate without activated carbon.
Our analysis shows that the influence of active carbon mixed with urea formaldehyde adhesive on the properties of Ousong board, 4.5% Good activated carbon concentration of can enhance physical properties ( Including water resistance and dimensional stability ) Good results. Adding activated carbon causes total color change ( Δ E) the height is 7.72% Therefore, care must be taken when using activated carbon when aesthetics are important. add to 4.5% Activated carbon and addition 7.5% Active carbon IB 、 MOR and MOE There is no statistical difference in performance. Compared with the reference Ousong board, add 7.5% Activated carbon makes the IB 、 MOR and MOE The values are increased by approx 41% 、 28% and 21% 。 The thermal properties of the Eurozone board increased with the increase of activated carbon content.
