共查询到19条相似文献，搜索用时 859 毫秒
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采用在相对湿度为１００％的环境中，测定材料因吸潮而增重的方法对６种橡胶木阻燃胶合板吸潮率，药剂吸潮率以及胶合板吸药率为１５％时与未阻燃处理的橡胶木胶合板吸潮眩进行了对比和评估。其中磷－氮系阻 吸潮性明显高于ＷＦＲ树脂型阻燃剂，所有阻燃处理的橡胶木胶合板吸潮性均高于未处理的普通橡胶木胶合板。 相似文献
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橡胶木胶合板的阻燃处理试验结果表明，在ＷＦＲ１基础上调整后的配方ＷＦＲ１－２－ａ处理的橡胶木胶合板具有好的阻燃效果，产品按ＧＢ／Ｔ ８６２５－８８检测，达到建筑材料难燃Ｂ１级，胶合强度达到未阻燃处理胶合板的水平。 相似文献
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通过对橡胶木胶合板与水曲柳胶合板、杨木胶合板、椴木胶合板的点着性、燃烧释热性、火传播性、发烟性以及热重曲线的对比,了解橡胶木胶合板的燃烧性质和热性质是一步探讨ＷＦＲ作为橡胶木胶合板阻燃剂的处理效果。 相似文献
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对已经ＷＦＲ１－２－ａ阻燃剂处理的橡胶木胶合板进行抗霉弯效力测定，结果表明：处理试样对橡胶木常见表面霉菌有一定的防治效力，对蓝变菌的防治效力达１００％，未处理试样发霉变色严重。 相似文献
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4A分子筛改性阻燃胶合板的研制 总被引：1，自引：0，他引：1
用4A分子筛改性脲醛树脂、BL阻燃剂处理杨木单板,通过正交试验设计,制备阻燃胶合板并检测其胶合强度及阻燃性能。结果表明,分子筛可提高阻燃胶合板的胶合强度,分子筛加入胶黏剂中对阻燃胶合板的阻燃性能影响不大。分子筛改性阻燃胶合板制造的优化工艺为阻燃剂浓度10%、分子筛量4%、涂胶量380g/m2、热压温度120℃。 相似文献
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阻燃胶合板的阻燃效果及性能测定 总被引：1，自引：0，他引：1
测定了普通柳桉和水母柳胶合板经CU－60阻燃剂处理后的阻燃效果及相关性能指标的变化。结果表明：处理后胶合板的难燃等级达B1级，且胶合强度与国际相比下降不超过10％，漆膜附着力达二级。 相似文献
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Summary The results of tests of combustion toxicity, hygroscopicity, and adhesive strength for fire retardant-treated plywood are described. The plywood was prepared from veneers treated with diammonium phosphate and ammonium bromide, and from glue mixed with poly (ammonium phosphate). Furthermore, the plywood boards were coated with boric acid. High ammonium phosphate and low or 0 ammonium bromide contents with the boric acid-coatings gave the greatest improvement in the combustion toxicity. Influence of almost all the treatments on the hygroscopicity was not significant. In all treatments the dry adhesive strength and the cyclic boil adhesive strength were slightly and considerably reduced, respectively. 相似文献
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该研究采用BL-阻燃剂溶液浸渍处理杨木单板,比较分析BL-阻燃杨木与未阻燃杨木的吸湿性和尺寸稳定性的影响。结果表明:①在不同的湿度条件下,阻燃处理后试件的吸潮率递增值明显高于未处理材。②BL-阻燃剂浓度越高的试件吸潮率也越高,相同浓度的试件在不同湿度中,湿度越高,其吸潮率也越高。③阻燃后杨木单板的尺寸变化率明显高于未处理材的,BL-阻燃剂具有较高的吸湿性,其对杨木单板尺寸稳定性的影响规律为:厚度弦向径向。 相似文献
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FRW阻燃胶合板的DMA分析 总被引：7，自引：0，他引：7
目前世界范围内木材资源短缺的情况日益加剧,发展人造板工业已成为世界各国解决木材资源严重不足的重要途径.其中,胶合板作为室内装饰的主要材料,其产量和需求量都在急剧增长.我国胶合板产量从1980年的33.00万m3增长到2004年的2 098.62万m3,呈现大幅度增长的趋势(张文标等,2000).但由于普通胶合板具有易燃性,在许多领域的应用上受到限制.因为一旦发生火灾,不仅造成重大的经济损失,而且往往会发生人员伤亡.1950-2003年全国共发生火灾4 177 730起,直接经济损失2 434.525 1亿元,因火灾死亡174 855人,受伤329 352人. 相似文献
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Anatta Patcharawijit Ram Yamsaengsung Nuttaporn Choodum 《Wood material science & engineering》2020,15(5):261-268
ABSTRACT This research was aimed to investigate mechanical properties, color and cell-wall components changes, and durability of pre-dried rubberwood (Hevea brasiliensis) after superheated steam (SS) treatment. Wood samples were treated at different SS temperatures (140–180°C) for 1–3?h. The highest compression strength parallel-to-grain, hardness and impact strength were found for samples treated at 160°C for 3?h (30.7% higher than untreated), at 150°C for 1?h (26.6% higher than untreated) and at 150°C for 2?h (52.6% higher than untreated), respectively. The surface color became darker after each treatment in comparison with the untreated wood. The number of accessible hydroxyl groups decreased and the relative cellulose crystallinity increased with SS temperature, indicating decreased hygroscopicity of the treated wood. Also, SEM micrographs of wood surface showed consistent decrease in starch particles with treatment temperature. Both decay and termite resistances of treated rubberwood improved with treatment temperature. All the analyzes showed that dried rubberwood treated with SS had some improvements in the mechanical properties, decreased hygroscopicity, and increase resistance to decay. 相似文献
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Heat treatments change the chemical and physical properties of wood and dimensional stability and hygroscopicity are affected
as a result of modifications of wood cell components. This study evaluated the water absorption of wood specimens treated
with boron compounds followed by heat treatment. Sugi (Cryptomeria japonica D. Don) sapwood specimens treated with either boric acid (BA) or disodium octoborate tetrahydrate (DOT) solutions were heat-modified
at either 180° or 220°C for 2 or 4 h. Carbohydrate composition and water absorption of the specimens were then measured and
compared with those of untreated and unheated specimens. Wood carbohydrates were significantly degraded in the specimens after
heat treatment. The heat treatment evidently decreased the water absorption and the heat-modified specimens absorbed less
water than unheated specimens. The higher the treatment temperature and the longer the treatment time, the lower the amount
of absorbed water. The boron-treated and heat-modified specimens, however, showed increased water absorption due to the hygroscopic
properties of BA and DOT. 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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采用热压方式对脱脂和未脱脂马尾松胶合板的性能进行研究。结果表明:在马尾松单板水煮脱脂过程中,随着脱脂时间的延长,其脱脂率逐渐加大,但脱脂速度相对降低。马尾松单板水煮脱脂在1~3 h内的脱脂率变化不大,脱脂效果与水煮时间关系不密切;在3~5 h内,单板脱脂率变化较大,脱脂率与水煮时间有密切关系。板坯热压的前3~4 min,未脱脂板坯的升温速度比脱脂板坯升温速度快;4 min后脱脂板坯的升温速度明显快于未脱脂板坯,而未脱脂板坯在较长时间内温度仅呈缓慢升高趋势。脱脂处理的马尾松胶合板在物理力学性能各个指标上都明显优于未脱脂处理的马尾松胶合板。 相似文献
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FR-1阻燃处理材的吸湿性与野外耐腐性 总被引：3，自引：0，他引：3
对FR－1阻燃处理材的吸湿性与野外耐腐性进行了初步探讨，试验结果表明：处理材在高温条件下的吸温率未超过28％，达到ASTM技术标准，其效果较目前广泛使用的磷酸二氢铵／硼化物、磷酸氢二钠好。与CCA、ACQ－B处理材相比，FR－1处理材的野外耐腐性效果不佳，不宜在室外与地接触的条件下使用。 相似文献