共查询到20条相似文献，搜索用时 312 毫秒
1.
2.
利用木粉和回收塑料制备的木塑复合材料具有良好的环保性,但制品表面装饰性差。采用砂光、紫外辐照、红外辐射3种方式处理木粉/高密度聚乙烯(WF/HDPE)复合材表面,以异氰酸酯或异氰酸酯交联聚醋酸乙烯酯(乳白胶)作为胶黏剂对WF/HDPE复合材进行单板贴面。通过表面胶合强度测试、表面接触角和粗糙度测试、扫描电子显微镜、傅里叶变换红外光谱和X射线扫描分析等手段研究了不同处理方式对表面胶合强度的影响。结果表明:320目砂纸砂光的表面胶合效果优于600目砂纸砂光的,可使WF/HDPE复合材表面具有适当粗糙度和极性。紫外辐照度1.00 W/m~2、辐照24 h和180℃-25 s红外辐射是比较好的处理条件,尽管没有进一步提高表面胶合强度,但红外辐射可减少砂光量。采用异氰酸酯交联乳白胶作为胶黏剂时,砂光处理的表面胶合强度为2.96 MPa,紫外辐照处理达到2.91 MPa,红外辐射处理达到2.87 MPa。3种方式处理的WF/HDPE复合材均能耐63℃水浸渍,传统人造板贴面技术完全有可能适用于木塑复合材料的表面装饰。 相似文献
3.
以枝桠材及加工剩余物为主要原料制备木质纤维作为增强材料,工业排烟脱硫废弃物经煅烧制得的半水硫酸钙为粘结剂,加入高效复合缓凝剂增加脱硫石膏的初凝时间,满足生产工艺要求;加入导电炭黑使最终生产出的脱硫石膏纤维板的系统电阻降低,达到抗静电产品要求。试验结果表明:A型导电炭黑加入量为脱硫石膏质量分数的11%时,B型导电炭黑加入量为脱硫石膏质量分数的5%时,抗静电脱硫石膏纤维板的系统电阻可满足LY/T 1330-1999《抗静电木质活动地板》标准要求,此时抗静电脱硫石膏纤维板的物理力学性能达到相关标准要求。 相似文献
4.
用整个麦秸袋装培育平菇 ,其生物学效率可达 2 0 0 % ,且品质和口感优于棉子壳栽培的平菇 ,品质接近于野生菇。其技术要点 :1 原料处理将麦秸捆成 2 .5kg的小捆 ,放于 3 %的石灰水中浸泡 2 0min ,捞起沥干多余水分 ,即可堆料。若是用联合收割机收的麦秸或打麦机打的麦秸 ,事先需将麦秸用石磙碾压。2 原料配比一般 10 0kg麦秸 ,添加麦麸 10～ 2 0kg、尿素 0 .7kg、过磷酸钙 2kg、石膏 1kg、草木灰 5kg ,将辅料拌匀后加水调至含水量 65 %左右。3 建堆发酵发酵场地室内外均可 ,堆宽 1.5m ,高1.2m ,长度不限。每铺一层麦秸撒一层辅料 ,堆料不… 相似文献
5.
以麦秸和环保阻燃无机胶黏剂为原料,采用正交试验法对常温高压条件下无机胶黏麦秸板制备工艺进行优化,同时采用热重法和锥形量热法对麦秸板的热稳定性和燃烧性能进行测试与表征。结果表明:以密度为1.05g/cm~3、胶黏剂与麦秸比例为1.9:1和改性剂与麦秸比例为0.25:1的工艺条件制备的麦秸板:物理力学性能指标均高于国标GB/T21723—2008《麦(稻)秸秆刨花板》;热稳定性显著提高,最终质量残余率提高了53.2%;HRR、THR、SPR、TSP均大幅降低。无机胶黏麦秸板具有优异的阻燃抑烟性能。 相似文献
6.
7.
麦秸/聚苯乙烯复合材料工艺参数研究 总被引：1，自引：0，他引：1
以麦秸和废旧聚苯乙烯塑料为原料,采用冷混-热压工艺,通过正交试验和单因子试验,研究热压时间、热压温度、复合材料密度、聚苯乙烯比例和施胶量等工艺参数对麦秸/聚苯乙烯复合材料性能的影响.结果表明:热压时间7 min、热压温度190℃、聚苯乙烯比例为35%、施胶量3%、复合材料密度0.6 g·cm-3和0.65 g·cm-3时,压制出的麦秸/聚苯乙烯复合材料各项物理力学性能指标达到刨花板国家标准(GB/T 4897.1-4897.7-2003)要求,确定了试验的最佳工艺参数和工艺条件. 相似文献
8.
以脱脂饼粕为原料,采取水浸法提取籽胶固沙剂并喷洒在流动沙土表面,取得了明显的固沙效果。测定结果表明:料液比0.5%～3.0%,室温条件下水浸提24～72 h,其水溶性籽胶干物质含量平均为2.89%。随着料液比和提取时间的增加,喷洒籽胶固沙剂5 kg/m^2,沙结壳硬度由0.25 kg/cm^2逐渐增加到1.37 kg/cm^2,但沙结壳厚度并没有这样的变化规律,而是随着料液比增加,提取24 h,沙结壳厚度由1.76 cm逐渐增加到2.74 cm,提取48 h或72 h,沙结壳厚度变化范围分别为1.56～1.72 cm或1.49～1.76 cm。料液比2%,提取24 h,喷洒籽胶固沙剂5～14 kg/m^2,沙结壳硬度由0.65 kg/cm^2增加到1.94 kg/cm^2,沙结壳厚度由2.2 cm增加到3.3 cm。水浸法提取饼粕籽胶固沙剂在流动沙土表面具有良好的入渗深度和胶结效果,且沙胶结壳厚度、硬度和提取饼粕料液比、提取时间及喷洒量有密切关系。 相似文献
9.
以麦秸碎料为主要原料,采用漆酶水浴与干法两种不同处理方法压制麦秸无胶碎料板,研究热压温度、热压压力和热压时间对板材物理力学性能的影响。试验结果表明:影响麦秸无胶碎料板物理力学性能的主要因素是热压温度;水浴处理方法压制碎料板的物理力学性能优于干法压制的碎料板;漆酶水浴处理方法较优的热压工艺参数为漆酶用量43.6U/g,含水率10%,热压温度170℃,热压压力3~4MPa,热压时间20~25min。 相似文献
10.
11.
Upgrading of urea formaldehyde-bonded reed and wheat straw particleboards using silane coupling agents 总被引：3，自引：0，他引：3
Guangping Han Changwu Zhang Dongmei Zhang Kenji Umemura Shuichi Kawai 《Journal of Wood Science》1998,44(4):282-286
Reed and wheat straw particleboards bonded with urea formaldehyde (UF) resin were manufactured from two different material configurations (i.e., fine and coarse particles). The board densities were in the range of 0.550–.90g/cm3. The effects of particle size and board density on the board properties were examined. The properties of particleboard produced from fine particles were better than those made from coarse particles. An increase in board density resulted in a corresponding improvement in the board properties. The properties of OF bonded reed and wheat straw particleboards were relatively lower than those of commercial particleboards. Three silane coupling agents were used to improve the bondability between the reed and wheat particles and OF resin. Results of this study indicate that all the board properties were improved by the addition of silane coupling agent. The degree of improvement achieved from each coupling agent was different; epoxide silane was found to be more effective for reed straw particleboard, and amino silane was better for wheat straw particleboard. 相似文献
12.
Seyedeh Masoumeh Hafezi Kazem Doosthoseini 《林业研究》2014,25(3):667-670
We used silane coupling agents to improve the bonding ability between wheat straw particles and UF resin, and investigated surface properties （wettability and surface roughness） and hardness of parti-cleboard made from UF-bonded wheat straw （Triticum aestivum L.） combined with poplar wood as affected by silane coupling agent content and straw/poplar wood particle ratios. We manufactured one-layered particleboard panels at four different ratios of straw to poplar wood par-ticles （0%, 15%, 30% and 45% wheat straw） and silane coupling agent content at three levels of 0, 5% and 10%. Roughness measurements, average roughness （Ra）, mean peak-to-valley height （Rz）, and root mean square roughness （Rq） were measured on unsanded samples by using a fine stylus tracing technique. We obtained contact angle measurements by using a goniometer connected to a digital camera and computer sys-tem. Boards containing greater amounts of poplar particles had superior hardness compared to control samples and had lower wettability. Panels made with higher amounts of silane had lower Rq values. 相似文献
13.
We investigated the hydration behavior and some physical/mechanical properties of cement-bonded particleboard (CBPB) containing particles of wheat straw and poplar wood at various usage ratios and bonded with Portland cement mixed with different levels of inorganic additives. We determined the setting time and compression strength of cement pastes containing different additives and particles, and studied the effects of these additives and particles on thickness swelling, internal bond strength and modulus of rupture of CBPB by using RSM (Response Surface Methodology). The mathematical model equations (second-order response functions) were derived to optimize properties of CBPB by computer simulation programming. Predicted values were in agreement with experimental values (R2 values of 0.93, 0.96 and 0.96 for TS, IB and MOR, respectively). RSM can be efficiently applied to model panel properties. The variables can affect the properties of panels. The cement composites with bending strength > 12.5 MPa and internal bond strength > 0.28 MPa can be made by using wheat straw as a reinforcing material. Straw particle usage up to 11.5% in the mixture satisfies the minimum requirements of International Standard, EN 312 (2003) for IB and MOR. The dose of 4.95% calcium chloride, by weight of cement, can improve mechanical properties of the panels at the minimum requirement of EN 312. By increasing straw content from 0 to 30%, TS was reduced by increasing straw particle usage up to 1.5% and with 5.54% calcium chloride in the mixture, TS satisfied the EN 312 standard. 相似文献
14.
木纤维与麦秸刨花制造纤维刨花板的工艺研究 总被引：4，自引：0，他引：4
对以木纤维及麦秸刨花为原料制造纤维刨花板的制造工艺及板材性能进行了研究。结果表明，利用木材及麦秸原料制造纤维刨花板的工艺可行，板板的性能完全可以达到中密度纤维板国家标准的要求。 相似文献
15.
16.
一年生植物作为石膏刨花板原料的适应性 总被引：3，自引：0，他引：3
本文叙述了使用德国及中国建筑石膏和甘蔗渣、竹材、棉秆、麦秸、稻草等一年生植物生产石膏刨花板的适应性,分析了石膏的成分和性能,测定了缓凝剂和植物原料对石膏水化的影响。制板时采用不同的配方和板的密度,以评价一年生植物的使用价值。在所使用的原料中,甘蔗渣是良好的石膏刨花板原料。 相似文献
17.
18.
19.
Miscanthus sacchariflorus straw was used as a raw material for the manufacture of Miscanthus–wood particle composite board with Douglas-fir particles in ratios of 100/0, 80/20, 60/40, 40/60, 20/80, and 0/100. A commercial phenol–formaldehyde resin was used as a binder at 9 and 11 % for target densities of 0.50 and 0.65 g/cm3, respectively. The effects of the Miscanthus/wood particle ratio on the composite board properties were investigated. In addition, the density profile was also examined to improve the understanding of the composite board manufacturing process. Results indicate that the internal bonding value increased drastically in the board containing up to 50 % wood particles, providing a valuable parameter for subsequent research. The board properties were greatly improved with increasing density and binder addition level. 相似文献
20.
Straw-wood composites bonded with various adhesive systems 总被引：2，自引：0，他引：2
A. H. Grigoriou 《Wood Science and Technology》2000,34(4):355-365
In order to study the feasibility of utilizing wheat straw as an alternative raw material for panels, experimental one-layer
particleboards were produced by mixing straw with industrial wood particles in various proportions (100:0, 75:25, 50:50, 25:75,
0:100). Three different adhesive systems were used for blending the raw materials: a UF resin (E2 grade), a PMDI resin and various UF:PMDI combinations (10:0, 8:2, 7:3, 6:4, 5:5). The evaluation of the mechanical and hygroscopic
properties of panels showed the following results: Partial replacement of wood particles from straw in panels bonded with
pure UF resin resulted in deterioration of all properties except linear swelling. Partial or whole substitution of wood by
straw in PMDI bonded panels, improved the bending strength and all hygroscopic properties of the panels but reduced the internal
bond (dry and wet) and screw holding strength, although to a much smaller degree compared to UF bonded panels. The properties
of panels bonded with various UF:PMDI combinations and comprising 50% wood and 50% straw were considerably improved by increasing
the PMDI content. In terms of the properties, pure straw panels or panels made of certain wood/straw mixtures, if bonded with
PMDI resin or the appropriate UF:PMDI combination, can be used for specific applications where high quality panels are required
according to the specifications of the related standards.
Received 11 February 1998 相似文献