共查询到20条相似文献,搜索用时 234 毫秒
1.
韩建 《中南林业科技大学学报(自然科学版)》2007,27(3):101-105
以改性三聚氰胺甲醛树脂(MF树脂)和酚醛树脂(PF树脂)为胶粘剂,设计了两组热压工艺参数,按照“冷-热-冷”工艺压制竹帘胶合板.对制品按标准JG/165-2004进行了检测,并对检测结果进行比较分析.分析结果表明,该改性MF树脂竹帘胶合板的弹性模量稍高于PF树脂竹帘胶合板,但静曲强度和保留强度不如PF树脂竹帘胶合板.如果适当增加产品的密度和降低改性MF树脂中尿素的比例,产品质量将可以进一步提高,证明该改性MF树脂可以替代PF树脂用于竹帘胶合板生产,且产品质量可以达到标准JG/165-2004的要求. 相似文献
2.
韩健 《中南林业科技大学学报(自然科学版)》2006,26(5):74-78
以竹胶合板用酚醛树脂合成工艺为基础,按不同的尿素与苯酚摩尔比.合成一系列苯酚-尿素-甲醛共聚型树脂胶粘剂(PUF),并用该系列胶粘剂压制竹帘胶合板.通过对竹帘胶合板进行性能检测和检测结果分析,表明随尿素与苯酚摩尔比的增加,竹帘胶合板的力学性能总体呈下降趋势,但对静曲强度、弹性模量和冲击强度的影响不显著,对保存强度有很大的影响,将尿素与苯酚的摩尔比控耐在0.5以下时,产品可以达到国家相关标准的要求. 相似文献
3.
覆塑竹席竹帘胶合板生产工艺探讨钟建荣(湖南省会同县竹胶板厂418300)覆塑竹席竹帘胶合板是竹质人造板的一种,是目前比较受欢迎的竹质人造板之一。但是用户对质量的要求愈来愈高,覆塑竹席竹帘胶合板自身还存在较高的生产成本等因素,人们不得不对覆塑竹席竹帘胶... 相似文献
4.
5.
6.
对小变形条件下竹席竹帘胶舍板的弯曲力学特性进行研究,构建了竹席竹帘胶合板纵、横向载荷与应力、应变及挠度之间关系的数学模型,与实际数据拟合较好.这对解决竹席竹帘胶合板在实际应用中的弯曲变形问题具有一定的指导作用,也为深入研究竹席竹帘胶合板的力学特性提供了一定的实验基础. 相似文献
7.
8.
竹材在建筑结构中的应用前景分析 总被引:12,自引:2,他引:10
总结竹材的构造及力学性能,阐述竹材人造板中的竹编胶合板、竹帘胶合板、竹帘竹席胶合板、竹材胶合板、竹材层压板、竹材碎料板及竹材复合板的工艺过程、产品特点及其用途,对近几年兴起的重组竹的加工工艺特点、研究现状及发展前景进行探讨。在此基础上提出了利用竹材人造板及重组竹的加工技术制作竹建筑结构用竹质板材和方材的方法,以及由竹板或竹板和钢板构成竹材组合板、组合梁、组合柱、组合墙体等结构构件的思路。 相似文献
9.
覆塑竹席竹帘胶合板外观质量差的改进措施 总被引:1,自引:0,他引:1
覆塑竹席竹帘胶合板外观质量差的改进措施钟建荣(湖南省会同县竹胶板厂会同418300)70年代以来,我国竹材人造板的研制和生产有了很大的发展,为“以竹代木”开辟了一条新路。目前我国已投产的竹材人造板有竹编胶合板、竹材胶合板、竹材层压板、竹席竹帘胶合板、... 相似文献
10.
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
11.
12.
Larix tannin-phenol-formaldehyde (TPF) adhesive, having 60% by weight of phenol being replaced, was evaluated for its utilization
in plywood. The kinetic characteristic of the TPF resin was investigated through differential scanning calorimetry (DSC) and
the results obtained from the DSC scans show that the resin has a little bit different thermochemical behavior from that of
phenol-formaldehyde (PF) resin. Two kinds of plywood panels were produced using the TPF adhesive in laboratory. The desired
test results met the Chinese GB 9846-88 and ZB B70006-88, respectively, and the long assembly time of TPF resin in preparing
plywood can be improved by mixing with the filler.All the properties of plywoods bonded with the TPF adhesive were compared
with those obtained with synthetic PF adhesive. 相似文献
13.
刨花板用快速固化酚醛树脂胶的研究 总被引:2,自引:0,他引:2
本研究采用不同于传统合成工艺的方法研制成低毒,高分子量的刨花板用快速固化酚醛树脂胶,试验结果表明,该胶的固人速度较普通酚醛树脂胶提高了40%左右,用此胶压制成的刨花板,其胶合性能达到了德国DIN 68763V100耐水刨花板标准,且热压时间较普通酚醛树脂刨花板可缩短25%左右。 相似文献
14.
三聚氰胺脲醛树脂改性酚醛树脂胶粘剂的研究 总被引:2,自引:0,他引:2
采用常规合成的脲醛(UF)或酚醛(PF)树脂胶对多层胶合板贴面时,很容易出现开胶或透胶现象。本研究采用三聚氰胺脲醛(MUF)树脂对PF树脂进行改性,生产浅色改性PF胶粘剂,探讨了MUF与PF树脂摩尔比、混合比、热压条件等对胶液的粘度、缩合度、稳定性、胶层颜色及胶合质量的影响。结果表明,改性后的浅色酚醛树脂胶粘剂筘存性好、固化后胶层近似木材本色、高强耐水、耐候,用来压制的多层实木复合地板可达到GB9846.1~12-88Ⅰ类胶合板要求。 相似文献
15.
INTRoDUCTIoNTheuseoftannin-basedadhesivesforthemanufactureofplywoodhasbeenre-portedbypreviousauthors(DaItonl95o,Herzbergl96o,Kulvikl975,Suomi-Lindbergl984,Vazquezl992,etc).Asthepotentialrawmaterialinpreparingadhe-sivecomponCnts,tannincanbeextractedfrommanyplantspecies-Suchprepara-honsarebasedonthereactionofbarkphenoliccomponentswithanaldehyde,usuaIlyformaldehyde.Thesevegetabletanninswhosecomponentsarephenoliccomponentsprovideapossibilityofusingthemforreplacingcertaincomponentsofsynthet… 相似文献
16.
Curing kinetics of phenol formaldehyde resin and wood-resin interactions in the presence of wood substrates 总被引:1,自引:0,他引:1
The curing kinetics of resol PF resin and resin–wood interactions in the presence of wood substrates have been studied by differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. The activation energy of cure of PF resin generally increases when PF resin is mixed with wood, mainly due to the decrease of the pH values resulting from the presence of wood. However, wood decreases the curing enthalpy of PF resin through diffusion and the change in the phase of the curing system, which suggests that the curing reactions reached a lower final degree of conversion for the mixtures of PF resin with wood than for the PF resin alone. Moreover, DSC curves and the variation of activation energy with conversion indicate that wood accelerates the addition reactions and retards condensation ones during the curing process of PF resin with wood. The study also revealed that almost no chemical reactions occur between PF resin and wood, but the secondary force interactions of hydroxyl groups between PF resin and wood have been detected. These most significant secondary forces can catalyze the self-condensation reactions of PF resin, although their effect is not vital on the curing kinetics of PF resin. 相似文献
17.
重组竹制造工艺的研究 总被引:13,自引:0,他引:13
本文是作者在施胶量、热压温度和热压时间三个主要因子对重组竹性能影响的初步研究基础上又进一步探讨了施胶方式、竹纤维束水洗、胶种以及胶的浓度等因素对产品性能的作用。研究结果表明:竹纤维束水洗有较显著的作用;水溶性酚醛胶比醇溶性酚醛胶更适用于重组竹的制造,胶液浓度过稀不仅自身性能差,而且还会使重组竹性能降低;采用浸胶方法虽有利于胶液的均勻分布,但对IB未产生明显的作用。 相似文献
18.
The interference of copper based preservative treated southern yellow pine (SYP) on the cure of phenol-formaldehyde adhesives
was investigated by using differential scanning calorimetry (DSC). Copper preservatives used in this study include copper
azole (NS), alkali copper quat (ACQ)-type C (NW). Three commercial phenol-formaldehyde (PF) adhesives used for oriented strand
board (OSB) face area, core area and a plywood adhesive were studied. The curing peak temperature and peak time of OSB core
and face PF resin shifted to higher temperature and duration in the presence of CCA, NS, and NW-treated SYP compared to that
in untreated SYP. The above treatments interfere with the cure of OSB core and face PF resin. Untreated SYP showed a curing
accelerating effect on the cure of plywood adhesive, but the accelerating effect of copper-treated SYP on the cure of plywood
resin was not significant. 相似文献
19.
20.
Application of cure-accelerated phenol-formaldehyde (PF) adhesives for three-layer medium density fiberboard (MDF) manufacture 总被引:3,自引:0,他引:3
This study was conducted to optimize hot pressing time and adhesive content for the manufacture of three-layer medium density
fiberboard (MDF) through the cure acceleration of phenol-formaldehyde (PF) adhesives by adding three carbonates (propylene
carbonate, sodium carbonate, and potassium carbonate) in the core layer. Carbonate type, carbonate level, PF resin content,
and hot pressing time were evaluated on the basis of the performance of MDF panels prepared. The application of cure-accelerated
PF adhesives by the addition of propylene carbonate reduced both PF resin content and total hot pressing time by 38% and 29%,
respectively, for the manufacture of quality three-layer MDF panels (19.1 mm thickness) under the hot-pressing temperature
of 205 °C. The optimum concentration of propylene carbonate for cure acceleration of PF resin was found to be 3 wt% by weight
based on the resin solids. Bending properties, on one hand, were independent of carbonate type and level, and complied with
the minimum requirements by ANSI. Internal bond (IB) strength, on the other hand, was closely related with carbonate types
and level used.
Received 13 March 1999 相似文献