WOOD RESEARCH Volume 70, Number 1, 2025
QIANHUI HUO, LEI YAN, XINJIE ZHOU, LILI YU, LIHUA HE, XIAO WANG, HUI LI, and LONGZE AN

WEATHERABILITY OF BAMBOO/PPC COMPOSITES MODIFIED WITH IPBC/DDAC AND UV1130

In this study, a compound anti-mold agent IPBC/DDAC and an ultraviolet absorber UV1130 were used to enhance the weatherability of bamboo/polypropylene carbonate (PPC) composites exposed outdoors. The samples were evaluated by mechanical test, surface color difference analysis, anti-ageing test and mold resistance test. The results indicated that the appropriate addition of IPBC/DDAC and UV1130 effectively mitigated the decline in tensile strength and flexural strength caused by changes in environmental factors; however, their impact on the variation in impact strength was not as significant. At the same level of IPBC/DDAC modification, the higher contents of the UV1130 introduction into the composites, the better surface color stability could be obtained. The introduction of appropriate amount of IPBC/DDAC and UV1130 can effectively improve the mold resistance, water vapor and thermal resistance of bamboo/PPC composite, in which the water vapor resistant level could be up to Grade 5, and no obvious cracks or bubbling were observed on the surface of the composites; the anti-mold efficiency of the composites could be above 90%

WOOD RESEARCH Volume 70, Number 1, 2025
LEI YAN, QIANHUI HUO, XINJIE ZHOU, HAN YU, LILI YU, LIHUA HE, XIAO WANG, HUI LI, and DEZHI ZHOU

EFFECTS OF WASTE POLYETHYLENE ON THE PROPERTIES OF BAMBOO/POLYPROPYLENE CARBONATE COMPOSITES

Bamboo-plastic composites were made by bamboo fibers (BF), polypropylene carbonate (PPC) and waste polyethylene (PE), modified with 3-iodo-2-propargyl butyl carbamate/didecyldimethyl ammonium chloride (IPBC/DDAC) as fungicides and UV1130 as ultraviolet absorbent to prolong their service life for outdoor application, in which 10%, 20%, 30%, 40% and 50% of PPC were replaced by waste PE, respectively to reduce their cost. The modified composites were characterized and analyzed by mechanical properties test, surface color difference analysis, and mold resistance test. The results showed that the tensile strength, bending strength and impact strength of BF/PPC/waste PE composites would decrease as the waste PE content increased, and only when the waste PE content was not higher than 20%, the mechanical properties could meet the application requirements for indoors and outdoors. The introduction of IPBC/DDAC and UV1130 could take positive effects on the mechanical properties, surface color stability and mold resistance of BF/PPC composites, while the tensile strength, bending strength and impact strength of BF/PPC/PE composites were 2.36%, 1.85%, and 1.67% lower than the modified BF/PPC composites, as well as the values of ∆L*, ∆a*, and ∆b* of the composites were lower , and the value of ∆E was higher than the BF/PPC modified composites after three months of outdoor exposure. The efficacy levels of the modified BF/PPC and BF/PPC/waste PE composites could be increased to 98.8% and 56.75%, respectively, due to the excellent mold resistance of the combined antifungal agents of IPBC/DDAC

WOOD RESEARCH Volume 69, Number 3, 2024
CHENYANG LI, YATING CAI, XINJIE ZHOU, RUOGU XU, HAN YU, LILI YU, HUI LI, XIAO WANG, and SHU-GUANG LI

PREPARATION PROCESS AND INTERFACE MODIFICATION ON THE MECHANICAL PROPERTIES OF BAMBOO FIBER/POLYPROPYLENE CARBONATE COMPOSITES

In this study, bamboo fiber (BF) and polypropylene carbonate (PPC) were used to prepare BF/PPC composite materials. The single factor test combined with orthogonal experiment was used to investigate the effects of different hot pressing process conditions (hot pressing temperature, hot pressing pressure and hot pressing time) on the mechanical properties of BF/PPC composites. Based on the hot pressing process results, the filler nano-calcium carbonate (Nano-CaCO3), γ-aminopropyl triethoxysilane (KH550) and maleic anhydride (MAH) were added respectively to the composites to improve the interface between BF and PPC in order to increase the mechanical properties of the composites. The results showed that the reasonable preparation conditions of BF/PPC composites with the best mechanical properties were set at 170°C, under 1.9 MPa for 10 min. Compared with PPC samples, the tensile modulus, bending modulus and impact strength of BF/PPC composites could be increased to 102%, 38.69% and 65.13%, respectively. The optimal interface modification treatments have been proved that nano-CaCO3 with 10% content could increase the tensile modulus and impact strength to 70.53% and 65.84%, while the best result for the bending modulus of BF/PPC composites was modified with MAH with 2.5% content, which could increase to 28.46%

WOOD RESEARCH Volume 69, Number 1, 2024
YATING CAI, CHENYANG LI, CAIJUAN ZAHNG, YULIN LIU, LILI YU, HUI LI, and XIAO WANG

PREPARATION AND PERFORMANCE OF ANTI MILDEW GLUED LAMINATED BAMBOO

In order to strengthen the anti-mildew and anti-aging properties of bamboo when exposed outdoors, the glued laminated bamboo was impregnated with four different kinds of anti-mildew agents: tebuconazole, 3-Iodo-2-propargyl butyl carbamate (IPBC), NaBF4/didecyl dimethyl ammonium chloride (DDAC), boric acid/borax, and waterborne polyurethane coatings modified with boric acid/borax and triazole (UV1130), nano-TiO2 and nano-SiO2 were coated respectively. The modified coated glued laminated bamboo was characterized and analyzed through the experiments of wear resistance, three-point bending resistance and mildew resistance. The results showed that the glued laminated bamboo impregnated with 0.5% NaBF4/DDAC, and then coated with the waterborne polyurethane modified with boric acid/borax and nano TiO2 (the mass ratio:7.5/7.5/1.0) possessed the best mildew resistance, mechanical properties and weather resistance