共查询到18条相似文献，搜索用时 177 毫秒
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在单板表面喷雾施涂异氰酸酯胶黏剂,热压制备无醛胶合板,比较不同树种的单板材料无醛胶合板的胶合性能,比较施胶后陈放时间对胶合性能的影响。结果表明,单板的材种对无醛胶合板性能有影响,杨木、桦木、尾叶桉这三种阔叶材的无醛胶合板的胶合强度达到了GB/T17657-1999中规定的Ⅰ类胶合板的胶合强度水平,而落叶松和杉木的胶合强度低于这个水平;施胶量为20g/m~2时,放置时间对胶合性能基本没有明显影响。根据试验结果并结合生产实际的成本分析表明,达到Ⅰ类胶合板水平的无醛胶合板的成本较PF板降低了80元/m~3,较UF板的成本增加了约100元/m~3。 相似文献
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选用3种自制阻燃剂浸渍思茅松单板,通过测试胶合板的胶合强度、氧指数和烟密度,分析阻燃剂对胶合板的胶合强度和燃烧性能的影响.研究结果表明:工业制备阻燃胶合板的胶合强度、氧指数、烟密度等级满足国家标准GB/T 17657和GB 8624-2006的要求,说明工业生产阻燃胶合板是可行的.与对照试件相比较,阻燃胶合板的氧指数提高了75.8％～149.8％、烟密度等级降低了15.4％～60.5％、胶合强度降低了43.9％ ～ 56.1％;其中阻燃剂FR-B对胶合板氧指数影响最大,阻燃剂FR-A对胶合板的烟密度影响最大,阻燃剂FR-C对胶合板的胶合强度影响最小. 相似文献
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用ＵＦ、ＭＵＦ胶制作三种松木胶合板，分别就单板厚度、涂胶量及抽提物含量对胶合性能的影响，松木与柳安混合树种组坯、特殊添加剂对改善胶合性能的作用进行了研究。结果表明：除了老挝松边材ＭＵＦ胶合板以外，１．５和２．０ｍｍ厚的单板胶合强度均达到或超过日本ＪＡＳ普通胶合板的要求。合板胶合强度随单板厚度增加而下降，在一定范围内增加涂胶量可以提高合板胶合强度，混合组坯及施加特殊添加剂具有改善松木单板胶合性能的作用。 相似文献
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短周期工业材层板等级区分与胶合木强度性能之关系宋润惠郝金城高云龙（黑龙江省林产工业研究所１试验目的结构胶合木是通过合理配置不同等级的层板径胶合而成的木质材料，与天然木材相比，它具有较大的规格尺寸和较高的力学强度，尺寸稳定性好，耐久性强。根据建筑设计要... 相似文献
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以磷酸二氢铵（MAP）溶液为阻燃剂,通过浸泡尾叶桉单板,研究了单板的载药量;以Ⅱ类胶合强度为指标,利用正交试验对常规胶合板生产工艺进行了优选。在此基础上,选取浸泡时间和最优生产工艺试制了阻燃桉树胶合板,并对其Ⅱ类胶合强度和燃烧性能进行了检测。结果表明：不同厚度尾叶桉单板的载药量随浸泡时间的延长呈现相似的增长规律;试验所得常规尾叶桉胶合板最优生产工艺为施胶量210 g.m-2、热压温度130℃、热压时间8 min,该条件下胶合板的Ⅱ类胶合强度达到了2.01 MPa;单板浸泡8h后,单板平均载药量为32.05 kg.m-3,所制得阻燃胶合板氧指数提高了13.9%,炭化长度减少了8.3 mm（26.2%）,阻燃性能明显提高,而胶合强度也达到了Ⅱ类胶合板的国家标准。研究初步证明利用常规桉树胶合板生产工艺生产阻燃桉树胶合板是可行的。 相似文献
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集成材是采用胶粘剂将短材或低质材胶合而制造的材料,其质量在很大程度上取决于胶粘剂的性能。集成材的基本要求是具有足够的胶合强度和良好的耐久性。而胶粘剂种类不同,集成材的胶合强度和耐久性差异较大。因此,了解各种胶粘剂的性能,正确选择和使用胶粘剂,对保证集成材的质量是非常重要的。为了了解集成材的各种胶粘剂的胶合性能,正确选择集成材的胶粘剂,我们选用了几种胶粘剂,并进行了集成材胶合性能的试验。本试验是以落叶松和水曲柳为代表树种,进行6种胶粘剂的性能试验,其中选择一种日本生产的间苯二酚胶粘剂与国内生产胶粘剂进行对比试验。一、试验方法1.试验材料 相似文献
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Wood-based panels such as plywood, oriented strand board, particleboard, and medium-density fiberboard are used for roof, wall and floor sheathing materials in residential construction. However, the service life of these panels is still unknown due to the lack of long-term durability data. In this paper, test results from six different indoor exposure experiments were integrated to investigate the long-term durability of wood-based panels. The indoor exposure tests lasted for a maximum of 10 years, providing the panels with the changes in moisture content that ranged between 5 and 18%. The reduction in mechanical properties was determined to be in the range of 0–16% for the bending strength, 3–22% for the modulus of elasticity, 11–31% for the internal bond strength and 0–8% for the nail-head pull-through strength. No reduction was recognized for the lateral nail resistance. Furthermore, the concept of deterioration intensity (DI) based on the moisture content history was introduced to predict the long-term durability of the panels, and various calculation methods for DI were discussed so as to increase the correlativity of this property with the reduction in a mechanical property. 相似文献
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随着适宜于制造胶合板的木材供应减少和价格上升,胶合板生产的优势地位已受到相当大的影响。小径材或速生材的利用及胶合板用材树种的扩大是发展胶合板生产最重要的措施。变革胶合板生产工艺可以开发利用新的原料来源、提高劳动生产率、降低生产成本、并使产品多样化。计算机控制和先进的电子技术大大地提高了胶合板生产线的效率和功能,并保证了产品的质量。 相似文献
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对采用同一工艺压制的成品胶合板进行BL-环保阻燃剂浸渍处理试验,观察其氧指数、甲醛释放量、烟密度和胶合强度四个性能参数的变化情况.试验结果表明,经浸渍处理的成品胶合板的环保、阻燃性能均不理想,很难达到环保、阻燃的要求,试验中氧指数最高为38%. 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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Bonding properties of konjac glucomannan (KGM), chitosan, and their composites were investigated. After preparing three-ply
plywood glued with these materials, the dry bond strength and the bond strength after water immersion treatment were measured.
The bond strength of urea-formaldehyde resin adhesive, casein, and soybean glues was also studied for comparison. KGM developed
relatively good dry bond strength in extremely small solid amounts, irrespective of alkaline treatment. However, the water
resistance was extremely low for all of the conditions. Chitosan also developed good dry bond strength in small solid amounts
and was better than conventional adhesives. Chitosan also exhibited excellent water resistance compared to casein and soybean
glues. When KGM and chitosan were combined, the adhesiveness under the dry condition was enhanced, and the bonding properties
were superior to those of casein and soybean glues. Therefore, it is expected that chitosan and chitosan–KGM composite can
be used as environmentally friendly wood adhesives.
Received: March 18, 2002 / Accepted: July 5, 2002
RID="*"
ID="*" Part of this paper was presented at the 51th Annual Meeting of the Japan Wood Research Society, Tokyo, April 2001 相似文献
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三聚氰胺改性低毒脲醛树脂耐水性研究 总被引：1，自引：0，他引：1
不同摩尔比的两类低毒脲醛树脂(JQ21未改性,JQ22与5%三聚氰胺共聚),分别与不同质量比的三聚氰胺树脂混合,并在不同的固化体系中固化,用于胶合板的压制.对胶合板的胶合性能及甲醛释放量进行了研究.实验结果表明:固化体系不同,胶接强度也不相同;随着摩尔比的增加,胶接强度提高,甲醛释放量亦相应提高;同时采用共聚和共混两种方法进行改性的脲醛树脂,其胶接强度和甲醛释放量均优于单一的采用共混改性的脲醛树脂;并且混合胶液中三聚氰胺的比例越低,胶接性能越筹,甲醛释放量变化逐渐趋于平稳. 相似文献
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Summary New information is presented that concerns flexural strength and stiffness of southern pine plywood and verification of a method developed by the U. S. Forest Products Laboratory for predicting properties of plywood. This method can predict, with sufficient accuracy, properties of southern pine plywood despite the large natural variability of veneer of this species and other variables. Strength and stiffness between 3-ply and 5-ply plywood with face grain parallel to span are compared. In addition, strength and stiffness between plywood and unidirectionally laminated veneer with same number of plies and total thickness are compared.This research was supported jointly by Federal funds under the McIntire-Stennis Cooperative Forestry Reserach Act (P.L. 87-788), Alabama Project No. 910 and Alabama State appropriated research funds. 相似文献
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The effect of addition of Acacia mangium bark powder on the thermosetting processes of two commercial phenol resins, PF-A and PF-B, was examined by bond strength
test, torsional braid analysis, and differential scanning calorimetry. When the bark powder was added to PF-A, the bond strength
of plywood pressed at 110°C increased and was comparable to that of plywood pressed at 120 and 130°C. However, when the bark
powder was added to PF-B, the bond strength of plywood pressed at 110°C was still lower than that of plywood pressed at 120
and 130°C. The relative rigidity and loss tangent of PF-A cured with the bark powder obtained by heating at 100°C were comparable
to those at 120 and 140°C, and the reaction enthalpy was increased by bark powder addition. In contrast, chemical reactions
for cured PF-B were not enhanced by bark powder addition. 相似文献