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在胶合板工业中脲醛树脂由于制造简单,使用方便,价格低廉,色浅,耐水性、胶合强度等性能较好,因此得到了广泛应用。据统计在我国胶合板工业中,脲醛树脂用量占80%左右。但是,由于脲醛树脂的基本原料为尿素和甲醛,因此在脲醛树脂制备及胶合板热压过程中都有大量的甲醛释放,另外在胶合板成品使用过程中也会不断地释放出少量游离甲醛。释放出的甲醛不仅污染空气,而且更重要的是对生产者和消费者均有不同程度的影响,严重地影响了人体的健康。现世界各国都对游离甲醛释放量严格控制,并对带有游离甲醛的产品使用场合严格限 相似文献
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几种人造板甲醛释放量探讨 总被引:4,自引:0,他引:4
用抽吸法测试了胶合板、细木工板、刨花板、中密度纤维板甲醛释放量并进行比较,结果表明:在所测板种中,胶合板的甲醛释放量最高,细木工板次之。 相似文献
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研究了PVAc型固化剂与UF树脂热压胶合板的甲醛释放量和粘接强度.结果表明:PVAc型固化剂对热压胶合板的粘接强度改善不大;其中,PVAc-Ⅲ型固化剂与UF树脂热压胶合板的甲醛释放量最低,低于氯化铵与UF树脂热压胶合板的甲醛释放量1.21mg/L,而且均达到F2级胶合板的要求;尤其PVAc-Ⅲ-4型固化剂在m(Hardener):m(UF)=10:100时,其甲醛释放量最高为0.70mg/L,最低为0.41mg/L,平均为0.52mg/L,基本达到F1级胶合板的要求. 相似文献
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国内外胶合板甲醛散发研究 总被引:3,自引:0,他引:3
从胶合板甲醛散发测试方法、影响因素及控制方法3方面,概述了国内外胶合板甲醛释放的研究。建议在国内系统深入地开展相关研究,以期推动国产胶合板甲醛散发控制的标准化和工业化,与国际接轨。 相似文献
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研究以硼酸、磷酸、氯化铵和锰化物为主要成分制备多元素复合阻燃剂,用浸渍法处理杨木单板并压制成胶合板,检测胶合板各项性能。结果表明:该阻燃剂对胶合板的阻燃性能有积极影响,其中热释放速率(HRR)降低26.32%,总释放热(THR)降低90.04%,总烟释放量(TSR)降低68.40%,同时胶合板的甲醛释放量降低了14.82%,说明该阻燃剂不仅有良好的阻燃效果和抑烟效果,还具有一定的甲醛捕捉能力。该阻燃剂对胶合板力学性能有一定的负面影响,板材胶合强度、弹性模量、静曲强度均有一定程度降低,但仍能达到GB/T 9846-2015《普通胶合板》标准要求。 相似文献
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本文描述了利用山杨材制和复合胶合板的研究,研究结果表明,以其优质材料旋切的单板为表层材料,以劣质木材制作的刨花板为芯层材料制作和复合胶合板的主要物理力学性能指标与传统的胶合板板基本相同。 相似文献
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Chih-Shen Chuang Kuang-Chung Tsai Ming-Kuang Wang Chia-Chih Ou Chun-Han Ko Ing-Luen Shiau 《Wood Science and Technology》2008,42(7):593-607
Acrylic emulsion based painted red lauan plywood (Parashorea spp.) is most commonly used for indoor furnishings. This study investigated the enhancement of the fire retardance of painted
plywood by interaction among four major components of intumescent formulation: (1) acrylic emulsion resin as binder resin
(BR), (2) pentaerythritol as carbonizing substance (CS), (3) melamine as foam producing substance (FPS) and (4) ammonium polyphosphate
as dehydrating agent (DA). Effects of changing BR/CS ratios (designated as FRA series) and FPS/DA ratios (designated as FRM
series) on flame-retardance of painted plywood were investigated using a cone calorimeter. The intumescent formulation significantly
enhanced fire retardancy of painted plywood by exhibiting lower peak release rates and longer times to reach peak release
rates, compared with uncoated plywood (UP) panel and plywood panel solely coated with acrylic emulsion resin. Lower BR content
in the FRA series and lower FPS content in the FRM series were shown to enhance flame retardancy of painted plywood. The positive
correlation between total heat release values under increasing combustion duration and incremental changes of BR and FPS contents
in two series further verified the above findings. Consistent with the observed flame retardancy enhancement of painted plywood,
lower heats of combustion and weight losses for paints in the FRM series were also identified by oxygen bomb calorimeter measurements
and thermogravimetrical analysis. Infrared analysis of the chars indicated the formation of phosphate ester linkages with
the lowest BR content in the FRA series and the lowest FPS content in the FRM series showing superior enhancements of flame
retardancy for painted red lauan plywood. 相似文献
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以环保型动物角蛋白添加剂作为脲醛树脂胶改性剂,选用A、B 2种环保型动物角蛋白改性剂,试验其不同用量对脲醛树脂(UF)胶合板胶合强度、木破率、浸渍剥离性能、吸水厚度膨胀率的影响。研究结果表明,环保型动物角蛋白作为改性剂,能在一定程度上提高UF胶合板的胶合强度,但会降低UF胶合板的耐水性;添加量相同时,固体含量大的环保型动物角蛋白其对应的UF胶合板胶合强度较大;随着动物角蛋白添加量的逐步增加,UF胶合板甲醛释放量呈明显下降趋势,当添加量接近15%时,甲醛释放量接近E0级。 相似文献
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厚芯竹帘胶合板制备的研究 总被引:1,自引:0,他引:1
将毛竹径向剖分加工成保持竹壁原有厚度和削度的等厚竹片,侧立串合成厚芯板,与竹帘(席)组坯压制成一种厚芯竹帘胶合板,有利于提高竹材利用率和降低胶粘剂使用量。试验结果表明:厚芯竹帘胶合板的物理力学性能达到JG/T3026—1995竹胶合板模板标准的要求。 相似文献
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竹木复合胶合板二次覆面工艺研究 总被引:2,自引:0,他引:2
针对目前国内竹胶合板建筑模板普遍存在厚度公差大、表面质量差等严重影响产品质量的问题,进行了竹木复合和二次覆面工艺的探索。研究结果表明:产品厚度公差和表面质量以及主要物理力学性能达到或超过竹胶合板模板JG/T156—2004标准优等品质量要求。 相似文献
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Chih-Shen Chuang Te-Hsin Yang Kuang-Chung Tsai Tsung-Yao Tseng Ming-Kuang Wang 《Wood Science and Technology》2013,47(2):353-367
Using intumescent coatings on wood-based materials is an effective method for fire safety. Previous studies have demonstrated that the formulation of components strongly influences the performance of coatings. This study investigated the effect of intumescent formulation of vinyl acetate-acrylic coating on flame retardancy of plywood. The fire retardancy of materials was assessed by both heat release and CO and CO2 emissions. The CO and CO2 emissions have not been used frequently to rank materials; the highly toxic CO and CO2 may cause most fire fatalities. The fire retardancy of coatings on plywood was assessed by a cone calorimeter. Total heat release and time to peak heat release rate were the two primary parameters. The data show that low contents of binder resin (BR) and foam producing substance (FPS) decreased total heat release and lengthened time to peak heat release rate. Additionally, low BR and FPS content can form an ideal char layer. The ideal char layer significantly decreased the CO and CO2 emission. The mechanism to achieve better fire performance was verified by thermogravimetrical analysis exhibiting lower weight loss. Moreover, evaluated by 31P NMR, the low BR and FPS content can extend the survival duration of phosphor-carbonaceous chars. The results provide information for designing vinyl acetate-acrylic emulsion coating. 相似文献