基于改性大豆蛋白胶粘剂的刨花板性能研究

研究了改性大豆蛋白胶粘剂的流变特性及基于改性大豆蛋白胶粘剂的刨花板力学性能。结果表明。NaOH、十二烷基硫酸钠（SDS）及脲改性,均使大豆蛋白胶粘剂的黏度增大,NaOH和SDS的改性效果优于脲。相比于未改性的大豆蛋白胶粘剂刨花板,NaOH和SDS的改性明显提高了刨花板的静曲强度、弹性模量及抗拉强度,所制刨花板已达到美国标准ANSIA208,1中M—S级刨花板性能指标的要求。选用粒度范围为2-5mm的中刨花时,刨花板的力学性能最好,当刨花粒度过小（0-2mm）或过大（5-8mm）时,刨花板的力学性能指标均减小。基于NaOH改性大豆蛋白胶粘剂的木刨花板力学性能优于竹刨花板及稻秸刨花板。     

零甲醛刨花板工业化生产的初步总结

“零甲醛刨花板”系指用非醛类胶粘剂生产的没有甲醛释放的刨花板,可以满足目前世界上对甲醛释放限量要求最高的日本刨花板标准JISA5908—2003中的F☆☆☆☆级刨花板的要求。用异氰酸酯(PMDI)胶粘剂生产刨花板的生产工艺,涉及到热压过程中的脱模、热压工艺、低施胶量均匀施胶等诸方面的新设备、新技术,只有这些问题解决得好,才有可能生产出好的板材。     

结构刨花板胶粘剂

结构刨花板胶粘剂ＮＬＰＦ－８４酚醛树脂是结构刨花板（包括定向刨花板和华夫板等）专用胶粘剂，它具有胶合强度高，固化速度快，粘度小，初粘性高，游离酚含量低，润湿性、流动性、稳定性和重复性好，制胶过程反应速度快，生产周期短，生产工艺简单等优点。用于压制速生...     

酚醛胶"耐水刨花板"工业化生产的初步总结

从快速固化胶粘剂的制备、刨花板的生产工艺以及产品性能的测定3方面简要介绍了“耐水刨花板”的研制情况。     

石膏刨花板生产技术

石膏刨花板生产技术中南林学院唐永裕石膏刨花板是以石膏为胶粘剂，木质刨花为加强材料的人造板材，它是一种理想的轻质建筑材料。石膏刨花板具有优良的技术性能，它在纵横两个方向均具有较高的抗弯强度，它属于Ａ２级不易燃的建筑材料而用于建筑物室内装修。石膏刨花板还...     

美国刨花板国家标准ANSI/A208.1—1989技术要求

表1 1类刨花板的技术要求a.厚度偏差是制造商对砂光板的规定要求。非砂光板的厚度偏差是由制造商和买方协商而定。b.酚醛刨花板不测定甲醛释放量。生产刨花板时胶粘剂不含甲醛,则就没有甲醛释放量的要求。c.     

胶粘剂固化剂的添加及搅拌装置

在刨花板生产中,要按胶粘剂参数的变动和气温的变化及时地调整固化剂的加入量,以便保证产品的物理性能.固化剂的微量变化会引起胶粘剂固化速度的显著变化,所以必须实现固化剂流量的准确控制并使其与胶粘剂均匀混合.     

刨花板调胶系统

一、调胶在刨花板制造过程中的作用 影响刨花板性能的因素主要,胶粘剂的使用量,刨花和胶粘剂的配合比例以及胶粘剂在刨花表面分布的均匀程度。 二、胶粘剂的配料成分和要求: 一般胶粘剂的配料成分有五种(实际四种),这五种成分为原胶、固化剂、添加剂、氨水和水。 1.原胶: 碎粒板使用的原胶有两种:蛋白质胶和合成树脂胶。目前使用最广泛的是合成树脂胶中的尿醛树脂胶,但也有使用醛树脂胶(一般用水溶性酚醛树脂胶)。工厂生产中使用的尿醛树脂胶都有一定的参数要求,固     

微波改性谷朊粉在棉秆刨花板中的应用研究

本文对改性谷朊粉用作胶粘剂制作棉秆刨花板进行了研究。研究确定了刨花板的热压条件和谷朊粉微波改性条件。谷朊粉的优化改性条件为：谷朊粉浓度5%。微波功率160W,微波时间90S,pH值11.0;拂秆刨花板的优化热压条件为：压合压强6MPa;压合温度155℃,压合时间14min。按照上述条件制作的棉秆刨花板的静曲强度达到国家一级刨花板要求,平面结合强度接近二级刨花板的要求。     

日本产纤维板、刨花板将于2004年5月涨价10%

日刊木材新闻2004年4月9日报道,由于生产纤维板、刨花板所用的酚醛胶、尿素三聚氰胺胶价格普遍提高20%,导致其生产成本大幅增加,因此厂家计划于5月黄金周后,将纤维板、刨花板价格提高10%左右。2003年7月实施新的建筑基准法后,生产纤维板、刨花板用胶由以往的普通胶粘剂改为低甲     

Formaldehyde emission from particleboards manufactured with waste materials from plywood industry

Peeling cores, dried veneer residues and plywood edge pieces containing adhesive are used for particleboard production. So, in this study, the effect of waste materials from plywood industry used for particleboard manufacturing on the formaldehyde emission of panels was investigated.     

Emissions during combustion of particleboard and glued veneer

The combustion of particleboard and glued veneer was studied in order to evaluate if there are any negative effects on the environment from incineration of waste with adhesive. The particleboard was made with urea formaldehyde (UF) resin and the veneers were glued with different types of adhesives, UF, polyvinyl acetate, emulsion polymer isocyanate (EPI), melamine urea formaldehyde (MUF) and phenol resorcinol formaldehyde. The combustion tests were carried out in a fluidised sand bed reactor with a good oxygen supply at temperatures between 500°C and 1000°C for particleboard and at 750°C and 850°C for glued veneer. The emissions were compared with the emissions from combustion of pure wood and pellets made from wood. The results show that the emissions from both particleboard and glued veneer are similar to the emissions from pure wood. The only main difference is that the nitrogen oxide (NO_x) is increased when particleboard and nitrogen-containing adhesives, like UF, EPI and MUF, are combusted. The nitrogen from the adhesive is only to a minor extent converted to NO_x, e.g. only 4% of the nitrogen in particleboard gives NO_x.     

Characteristic industrial technology for exterior Eucalyptus particle board

Eucalyptus timber furnishes generally affect intensely and negatively the performance of exterior grade particleboard, especially when phenolic-type resins are used as the bonding agent. The problem has been identified as being due to two causes: (i) rapid decrease of pH of the Eucalyptus timber, and hence of the adhesive in contact with it, in the steam environment present in a particleboard during hot pressing, which badly retards adhesive curing, and (ii) the failure of Eucalyptus wood cell walls to crack under standard particleboard manufacturing pressures, leading to regeneration of full cell sizes and hence excessive board swelling on exposure to humid conditions. Simple but very effective solutions which have led to the continuous and consistent industrial manufacture since 1977 of Eucalyptus timber exterior particleboard bonded with phenolic-type resins, are described and discussed.     

Larch tannin adhesive for particleboard

This study was undertaken to evaluate the feasibility of Larch (Larix gmelini) tannin-based adhesive for particleboard. The tannin-phenol-formaldehyde (TPF) (60 percent tannin was used to substitute phenol in the resin) was used to produce exterior grade particleboard according to the L₉ (3⁴) orthogonal design test and the results met the German Standard DIN 68763 V100. It also can be said that the TPF particleboards are comparable to some synthetic phenol-formaldehyde (PF) resin exterior-type particleboards on the basis of contrast test and accelerated aging test. The Larch tannin would be a desirable substitute for phenol as a low cost material and the studied tannin-based adhesive is suitable for industrial application.     

Effect of layers relative moisture content on the IB strength of pine tannin bonded particleboard

Relative percentage of moisture content of surface and core layers in pine tannin-bonded particleboard influences markedly the internal bond (IB) strength of the board. This is due to the differential compression exercised on the layers related to their moisture content. The moisture content differential between surface and core layers in particleboard during pressing is a determining parameter for the internal bond (IB) strength of particleboard. In the case of tannin adhesives where these differences can be more pronounced than for synthetic adhesive the effect is more easily observable.     

Gipsplatten mit Holzspanarmierung

The discussion on formaldehyde release from wood particleboard has intensified the interest for other adhesive agents. Especially for constructive, i.e. building applications, the gypsum bonded wood particleboard seems to be a good alternative. The qualities of this board material become quite clear, when compared with other industrially manufactured board types. This paper is concerned with physical properties as well as applicatory points of view, always in comparison with other board materials. It becomes obvious that reinforced gypsum-wood-particleboards may be seen as a real alternative to conventional wood particleboard and to gypsum-cardboard panels.     

木塑复合刨花板制造技术及其应用

从环境安全型人造板产品的市场需求及废弃塑料膜资源化利用的角度,阐述了木塑复合刨花板制造技术开发的必要性和意义;介绍了木塑复合刨花板的基本制造工艺流程、胶合特点及技术关键。木塑复合刨花板耐水性好、力学性能好,且不使用含醛胶黏剂,可用于制造环境安全性好且防水性要求高的家具、橱柜、地板和复合门等,具有非常好的应用前景。     

谈谈E1级刨花板生产过程中的几点体会

介绍在采用E_1级脲醛树脂胶的情况下,生产E_1级刨花板对设备、胶粘剂、刨花制备、热压工艺及检测的要求。     

Methode zur Bestimmung der Emission von Diphenylmethan-4,4′-diisocyanat (MDI) aus isocyanatgebundenen Holzwerkstoffen

A method for the determination of 4,4′-diphenylmethane diisocyanate (MDI) and 4,4′-methylenedianiline (MDA) in air is presented. The air sample is drawn through an impinger containing diluted hydrochloric acid as absorption solution. MDI hydrolyzes quantitatively to MDA and is determined together with MDA absorbed from the air by high performance liquid chromatography after derivatization with 2,4-dinitro-1-fluorobenzene. MDA was included in the analysis because of its carcenogenic potency and to avoid an eventual loss of MDI due to hydrolysis during exposure and sampling. The method is sensitive (detection limit ca. 0.5 μg MDI/MDA/m³) and specific; other diisocyanates as tolylene-2,4-diisocyanate (2,4-TDI), tolylene-2,6-diisocyanate (2,6-TDI), 1,6-diisocyanatohexane (HDI) and isophorone diisocyanate (IPDI), respectively the corresponding diamines, do not interfere. MDI-bonded particleboard and a polymeric MDI adhesive were exposed in a test chamber under worst case-conditions (particleboard: high surface/air volume ratio (2 m²/m³) without air exchange; adhesive: large open surface in a small test chamber (0.16 m²/0.01 m³), thick adhesive layer (600 g/m²) and sampling start immediately after spreading). No MDI/MDA-emission was found in the case of particleboard. During the first two hours of exposure the adhesive emitted a very low amount of MDI/MDA near the detection limit.     

Steps to make the natural adhesive of Acacia mimosa tannin resistant to boiling water using Tinnevelly senna for particleboard production

Adding a small amount of Tinnevelly senna seed flour to the natural adhesive of condensed tannin from acacia mimosa type decreases the thickness swelling and water absorption in particleboards significantly. Likewise, internal bond, modulus of rupture and modulus of elasticity increase. FTIR did not show any change in the adhesive structure. DSC and TGA showed a link between the additive of Tinnevelly senna and natural adhesive of acacia mimosa tannin, which obviously brings about the resistance to boiling water in particleboard manufacturing when using this adhesive mix.