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木材水抽提物对石膏及石膏刨花板的凝固及其性能的影响 总被引：2，自引：0，他引：2
本文研究了在商用缓凝剂(Retardan P)的存在下木材水抽提物对石膏浆料和石膏刨花板凝固时间及其强度的综合影响。结果表明:1.木材水抽提物能使石膏浆料和石膏刨花板产生缓凝,并导致强度下降,其影响程度与树种和石膏质量均有关系。2.木材水抽提物能加强Retarda P的缓凝作用,并且用两者交互作用下石膏浆料的凝固时间,可以指示石膏刨花板的凝固时间。3.石膏刨花板的静曲强度受刨花树种的影响,但缓凝剂的添加量却无显著作用。 相似文献
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刨花形态,树皮含量及石膏质量与石膏刨花板性能的关系 总被引：1，自引：0，他引：1
对刨花形态、树皮含量及石膏粉质量与石膏刨花板性能之间关系的研究结果表明:保持一定的刨花长度有利于提高石膏刨花板的静曲强度;石膏刨花板的静曲强度随着木刨花中树皮含量的增加而下降,但把树皮作为填料加入石密刨花板能使板子强度得以提高,不同产地的石膏粉制成的石膏刨花板性能差异很大,按建筑石膏粉标准测定的性能指标及相组成与石膏刨花板的性能之间无显著的相关关系。 相似文献
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研究了5种主要工艺参数对生物油-酚醛树脂胶粘剂制备刨花板性能的影响。结果表明,密度对所制备刨花板的静曲强度、弹性模量、内结合强度和表面结合强度均具有显著影响。施胶量也是影响刨花板性能的主要因素之一,随着施胶量的不断增加,刨花板的各项性能显著提高;提高热压温度和延长热压时间,刨花板的性能也会随之提高,但影响因素并不显著;防水剂加入量对刨花板力学性能影响很小。 相似文献
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提高石膏刨花板耐老化性能的进一步研究 总被引：1，自引：0，他引：1
本文研究了矿渣硅酸盐水泥对石膏水化性能的影响;水泥加入量与石膏硬化浆体力学强度的关系;石膏中掺入3～12%的矿渣硅酸盐水泥时,对石膏刨花板静曲强度和耐水性能的影响;石膏刨花板表面涂建筑涂料后,对其耐老化性、耐水性以及静曲强度的影响。 相似文献
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几种树种木材制造石膏刨花板的适应性 总被引：1，自引：0，他引：1
本文论述了挪威云杉、山杨、白桦和柞木及山杨、白桦、柞木的混合刨花制造石膏刨花板的适应性。结果表明,在工艺参数相同的情况下,木材密度越大的树种制成的板材强度越低,挪威云杉板强度最大,山杨板次之,柞木板极低。挪威云杉和山杨是制造石膏刨花板的优质树种。改变木膏比、刨花体积和对刨花进行水抽提均没有使白桦和柞木制成合格的石膏刨花板。混合刨花干扰石膏刨花板的凝固时间,致使板子强度低劣,在生产中应予避免。 相似文献
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对刨花板四种防水剂试验比较结果证明,86型防水剂可使每立方米刨花板降低成本6.2元,产品合格率提高55.1%。 相似文献
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新型人造板防水剂的研究 总被引：6，自引：0，他引：6
一种呈超微细粉末状的新型人造板防水剂,适用于对刨花板、中纤板及其它非木质人造板的防水处理。试验表明,新型防水剂具有提高板材防水性能和强度,减少脲醛树脂游离甲醛含量,简化工艺,降低成本和运输贮存方便诸方面的优越性。 相似文献
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添加剂对石膏创花板性能的影响 总被引：1，自引：0，他引：1
研究表明：在石膏刨花板生产中,添加０．５％～１％的缓凝剂－硼砂可延长石膏的初凝而对板的物理力学性能不产生明显影响,相反对其静曲强度和弹性模量等有一定的改进;添加５％～１５％的水泥对板的物理力学性能均有所改进,特别是吸水厚度膨胀率;水泥用量１０％时,对板的性能改进最明显;水泥和硼砂同时使用无不良影响。 相似文献
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This paper details the influence of the length and content of polypropylene (PP) fibers on the physical and mechanical properties of gypsum particleboard (GPB). The length and amount of PP fibers added had a significant effect on the internal bond strength (IB) and the modulus of rupture (MOR) of GPB. The highest IB value was shown at 9 mm length and 9% content of PP fibers. The MOR was highest when the board was made with PP of 12 mm fiber length and 12% content. Suitable contents of PP fibers were advantageous in that they reinforced the properties of GPB so it achieved high performance. In contrast, a high content of PP fibers reduced the IB, MOR, and modulus of elasticity (MOE) of GPB. The thickness swelling was reduced with an increase in PP length and content. It was concluded that the combination of 12 mm length and 12% content or 3mm length and 9% content was optimum for producing good performance of GPB.Part of this paper was presented at the 50th Annual Meeting of the Japan Wood Research Society, Kyoto, April 2000 相似文献
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Gypsum particleboard (GPB) has high thickness swelling (TS), high water absorption (WA), and low mechanical properties compared with cement-bonded particleboard. The properties of GPB were improved by adding cement. The experimental results showed that GPB with the added cement had good physical and mechanical properties compared with those of gypsum particleboard with no added cement. The TS and WA of gypsum particleboard with added cement were reduced by 10%. The mechanical properties of GPB, such as internal bond strength (IB), modulus of rupture (MOR), and modulus of elasticity (MOE), increased when the GPB was made with added cement. The properties of GPB improved relative to the quantity of cement added. With an increase of cement content from 5% to 10%, the TS and WA were reduced, and the IB, MOR, and MOE were increased. In contrast, the TS and WA increased and the IB, MOE, and MOR decreased when the cement content was increased from 15% to 30%. Thus the physical and mechanical properties of GPB were successfully improved when the added cement content was 10%.An outline of this paper was presented at the 47th Annual Meeting of the Japan Wood Research Society in Kochi, April 1997 相似文献
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Effect of buffers on gypsum particleboard properties 总被引：1，自引：0，他引：1
The paper recounts how buffers affect the physical and mechanical properties of gypsum particleboard (GPB) and the initial curing time (IC) of gypsum. The acidic buffers were better than alkaline buffers for prolonging the IC of gypsum and affecting the properties of GPB. Weak acids were advantageous for curing gypsum. When suitable amounts of citric acid and trisodium citrate were added, high performances could be achieved and the IC of gypsum could be prolonged to about 2h. When alkaline buffers such as sodium carbonate were added, the 1C of gypsum was still short but the internal bond strength (IB), modulus of elasticity (MOE), and modulus of rupture (MOR) of GPB were obviously decreased. Citric acid was the best among the four buffers used; and the GPB had a good IB, MOE, MOR, and adequate IC when citric acid of 0.1% was added. Sodium carbonate was not suitable owing to low performance and short IC. Gypsum curing is an endothermic reaction.Part of this paper was presented at the 11th Annual Meeting of the Chugoko Skikoku Branch of the Japan Wood Research Society, Matsue, September 1999 相似文献
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A water-soluble polysaccharide, GPB, was obtained from leaf of Ginkgo biloba L by hot water extraction followed by precipitation with ethanol and fractionation with gel chromatography. The results of HPLC with TSK-GEL column and gel filtration chromatography with Sepharose CL-6B analysis indicated GPB was uniform in polarity and its molecular weight (MW) was about 10 kDa. The structure of GPB was analysed using chemical methods, IR spectroscopy, and NMR spectroscopy. GPB has a high branched structure with polygalactose as core part of backbone. The repeating unit of polygalactose consists of 1,6-linked Galactose (Gal) and 1,3,6-linked Gal. 相似文献
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脱硫石膏刨花板制造工艺的初步研究 总被引：1，自引：0，他引：1
脱硫石膏为燃煤电厂烟气脱硫处理的一种化学副产物。本文分析讨论了脱硫石膏的性能及其与木材刨花混合制造石膏刨花板的可行性,初步探讨了脱硫石膏刨花板的制造工艺。结果表明,脱硫石膏用于制造石膏刨花板完全可行,其性能优于天然石膏生产的石膏刨花板,以木膏比０．１８生产的石膏刨花板材的各项性能均优于木膏比０．２２生产的板材。 相似文献
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纸浆模塑餐盒防油防水性能研究 总被引：3，自引：0，他引：3
对纸浆模塑快餐盒防油防水剂的选择及作用机理进行了阐述,并就防油防水剂的使用对产品质量的影响进行了研究分析,揭示了它们之间的相互关系。文章推荐了优化的工艺条件,ＡＫＤ用量０．２５％～０．４％,Ｆ３２１,１．５％～２５％,助留剂０．０１５％～０．０２％。 相似文献
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随着地下防水混凝土结构的应用日益增多,防水混凝土结构渗漏的问题越来越受到人们的重视,在近几年的施工中,我对地下防水混凝土的渗漏问题进行了不断的探索,实践表明地下防水混凝土结构的渗漏问题不仅与防水混凝土的选择有关,而且与沙、石、水泥等材料的选择、施工操作工艺、结构细部处理等密切相关。 相似文献