摩尔比对脲醛树脂胶和刨花板性能影响的研究

本文探讨了脲醛树脂胶中甲醛与尿素摩尔比(F/U)对胶粘剂和刨花板性能的影响,从而优选出生产E1级刨花板所用的胶粘剂。     

废旧木材在人造板生产中的利用

围绕废旧木材在人造板生产中的应用,介绍了废旧木材的来源及缺点,提出克服这些缺点的措施。列举了两种废旧木材在人造板生产中的应用实例。     

E0级环保刨花板生产系统解决方案初探

介绍采用E0级刨花板生产系统解决方案生产E0级环保刨花板。     

麦秸/木材均质复合无机碎料板的制备及其性能

以麦秸、木材和环保阻燃无机胶黏剂为主要原料,通过麦秸和木材碎料均匀混合的方式,采用热压工艺制备麦秸/木材均质复合无机碎料板,研究了麦秸与木材的配比、施胶量、热压时间和热压温度对板材性能的影响,并通过X射线衍射仪、扫描电镜分析了其对板材性能的影响机制。结果表明,随着麦秸与木材配比减小,板材静曲强度(MOR)、弹性模量(MOE)和内结合强度(IB)逐渐增大,2h吸水厚度膨胀率(TS)逐渐减小,优选配比为m(麦秸)∶m(木材)=4∶6。随着施胶量的增大,板材的MOR、MOE先增大后减小,IB逐渐增大,TS逐渐减小。施胶量为63%时,板材的MOR、MOE分别达到最大值15.5 MPa、3 110 MPa,此时,IB、TS分别为0.47 MPa、5.5%。随着热压温度的升高和热压时间的延长,板材的MOR、MOE、IB逐渐增大,TS逐渐减小。热压温度和热压时间分别为100℃、30min时,MOR、MOE、IB分别达到最大值(16.8 MPa、3 350 MPa、0.56 MPa),TS达到最小值(3.5%)。优化制板工艺为m(麦秸)∶m(木材)=4∶6,施胶量63%,热压时间30min,热压温度100℃。     

葵花秸秆刨花板的开发前景

介绍了国内外人造板资源状况、人造板发展现状和市场需求趋势,重点讨论了葵花秸秆刨花板的技术现状、市场前景和经济效益.指出了采用葵花秸秆生产刨花板具有良好的市场前景和经济效益.     

黑龙江省森工系统刨花板工业发展探讨

从扩大规模、提高质量、减少消耗、降低成本、增加产品品种等方面，对黑龙江省森工系统刨花板工业的发展进行了探讨。     

包装用薄型稻草刨花板的制备工艺研究

从包装减量化设计理念出发,探索了薄型稻草刨花板的制备工艺,为绿色包装设计提供材料支撑。 首先在 2% 的 MDI 施胶量水平下,探索了热压温度、热压时间、酚醛胶施胶量对板材物理力学性能的影响,但在最佳工艺条件下板材的内结合强度和吸水厚度膨胀率都没有达标。 将 MDI 的使用量提高到 3% ,并在热压温度为150 ℃ 、热压时间为 2. 0 min/ mm、酚醛胶施胶量为 14% 、石蜡用量为 1% 的最佳工艺条件下,制备的薄型稻草刨花板的各种性能都达到了标准的要求。     

Low Formaldehyde Emitting Biobased Wood Adhesives Manufactured from Mixtures of Tannin and Glyoxylated Lignin

Abstract

Kraft (LN-T-CO₂-2) and wheat straw (CIMV) glyoxalated lignin mixed with mimosa tannin and hexamine as a hardener were used as wood adhesive resins in particleboard fabrication. The adhesive systems proportion used were 40/60 and 50/50 w/w for lignin and tannin, respectively. The gel time test was determined by knowing the polymerization time between the different mixes under the controlled conditions. The results showed a slower polymerization with the kraft lignin/mimosa tannin blending than with the wheat straw lignin/mimosa tannin one. Thermomechanical analyses (TMA) tests were carried out as an indication of the final strength of the adhesive systems revealed by the elasticity modulus (MOE). The MOE results have demonstrated the best mechanical resistance values in 40/60 lignin/mimosa tannin proportion with respectively 3.422 and 3.347 (MPa), for CIMV and LN-T-CO₂-2, and 2.122 (MPa) for 50/50 proportion. Particleboards were prepared and the internal bond (IB) tests were carried out according to the European Standard EN 312. The IB tests confirmed the TMA results. The higher mechanical results of the IB were .43 and 0.53 (MPa), for CIMV and LN-T-CO₂-2 lignin in a 40/60 lignin/mimosa tannin proportion. They were classified as interior panel P2 in according with the standard request EN-312. Free-formaldehyde was determined through the flask method EN 717-3. Particleboards prepared with these natural adhesive resins registered emissions at least 87 and 75% lower than the commercial UF and MUF dhesive resins. The panels were classified as E0.     

LX—D—Ⅲ型脲醛树脂胶的研制及在刨花板生产中的应用

对本公司使用的LX—D—Ⅱ脲醛胶进行配方及生产工艺的改进，使胶游离甲醛含量更低（〈0．1％）。新胶命名为脲醛胶LX—D—Ⅲ，用其压制的刨花板甲醛释放量〈9mg／100g，达到E1级板的要求；静曲强度≥15MPa，内结合强度≥0．5MPa，吸水厚度膨胀率≤6％，达到国家标准GB／T4897—2003的有关规定。     

低甲醛释放高强度共缩聚树脂胶粘剂研制

用普通甲醛-尿素-三聚氰胺共缩聚树脂胶粘剂生产的刨花板强度、吸水厚度膨胀率、甲醛释放量不能同时兼顾。通过对共缩聚树脂胶粘剂合成工艺、三聚氰胺加入量的研究,生产出了高静曲强度、低吸水厚度膨胀率、低甲醛释放量的刨花板。该共缩聚树脂贮存期可达1个月。