胶合板用菜粕蛋白基胶粘剂的研究

以胶合强度、固含量、黏度作为评价指标,采用单因素分析的方法对菜粕添加量、菜粕溶液pH、环氧树脂添加量逐一进行探讨。研究结果表明:较优配比为菜粕粉25 g,蒸馏水100 g,用氢氧化钙将pH调至10～11,十二烷基硫酸钠1.3 g,顺丁烯二酸酐2 g,乙酸乙烯酯15 mL,苯乙烯20 mL,过硫酸铵1 g,10%的聚乙烯醇40 g,总胶量9%的环氧树脂。按GB/T 17657—2013标准进行胶合强度的检测,其胶合强度满足GB/T9846—2015标准中Ⅱ类胶合板的要求。     

用于胶合板的低毒耐水脲醛树脂胶粘剂

研究树脂合成过程中尿素和甲醛的摩尔比,三聚氰胺改性剂对树脂性能的影响,并在胶液中加入聚乙酸乙烯酯等助剂来改善胶的性能,得到低毒,耐水 ,强度显著提高的脲醛树脂胶。     

水性胶粘剂

我国数千年前就已开始使用以水为介质的胶粘物,用水调和粘土淀粉,胶粘石块,用骨胶、鱼胶粘接铠甲、刀鞘等。随着工业的发展,合成胶粘剂到当前也已向水性系统方向开发,以发挥其无污染、无毒性、安全、节约有机溶剂资源等优点,价格也较低廉,应用面也较广,可粘合木材、织物等多孔性材料,也可粘接金属、塑料、皮革等。目前,常用的水性胶粘剂通常是将高分子     

水性胶粘剂

本文介绍了用作水性胶粘剂的聚合物,以及水性胶粘剂的概况。     

水性聚氨酯胶粘剂研究进展

介绍了水性聚氨酯胶粘剂制备方法,综述了水性聚氨酯改性研究进展,分析了提高水性聚氨酯胶粘剂的耐温性、耐水性、初粘性、润湿性及干燥速度的途径。     

拜耳水性胶粘剂性优环保

拜耳公司推出的环保型水性胶粘剂系列产品备受业界广泛关注，其中Dispercoll U系列水性聚氨酯分散体用于配制蛟粘剂，能使制鞋行业等满足未来VOC指令的要求。Dispercoll C系列中单组分水基氯丁橡胶是环保型胶粘剂，对于多种被粘物都有较强的粘合力。     

国外水性聚氨酯胶粘剂的研究进展

综述了水性聚氨酯(WPU)胶粘剂的特点以及国外近几年的研究动态,阐述了WPU的改性方法及机制。最后对WPU未来的发展方向进行了展望。     

国内改性水性聚氨酯胶粘剂研究进展

简要地概括了国内WPU(水性聚氨酯)胶粘剂的基本发展现况以及常用的合成方法,并且综述了目前阶段的丙烯酸酯、环氧树脂、有机硅、有机氟、纳米材料、超支化预聚体和复合改性WPU等方法。指出了现阶段WPU胶粘剂所存在的一些基本问题,譬如固含量较低(45%左右),干燥固化的速度较慢,润湿性、初黏性、耐水性、耐热性及贮存稳定性较差等一些问题,并展望了WPU胶粘剂的发展趋势。     

胶合板用脲醛树脂胶粘剂的纳米改性

以MMT(蒙脱土)或OMMT(有机蒙脱土)作为改性剂,两者分别在UF(脲醛树脂)合成的不同阶段(加成阶段、缩聚阶段和缩聚后期)中以同一投料比引入体系中,制备相应的改性UF胶粘剂。研究结果表明:当n(F):n(U)=1.2:1、w(MMT或OMMT)=2%(相对于尿素总质量而言)时,MMT和OMMT的引入,能使相应改性UF胶粘剂的某些性能(如黏度、固含量、胶接强度和固化时间等)增加、游离甲醛含量降低;OMMT的改性效果优于MMT,并且OMMT在加成阶段投入时降醛效果明显,在缩聚阶段投入时补强效果明显。     

大豆蛋白胶粉胶合板热压工艺的研究

粉状胶粘剂具有贮存时间长、运输方便、含水量低的优点,为了防止热压过程中的＂鼓泡＂现象,促进大豆蛋白胶粉的应用,研究了用改性大豆蛋白胶粉制造胶合板的热压工艺,通过单因素实验和正交实验,得到最优组合为：胶粉施胶量120 g/m2,胶水施胶量230 g/m2,热压时间110 s/mm,热压压力132 MPa,此时胶合强度为0.98 MPa,达到国家标准Ⅱ类胶合板的要求。     

Peanut meal as plywood adhesives: preparation and characterization

Bio-based adhesives have attracted much attention due to its renewable and environment-friendly properties. This study describes a route for the preparation of a new bio-based adhesive from peanut meal. For this purpose, different types of raw materials (hot-pressed peanut meal and cold-pressed peanut meal) were compared. Moreover, the crushing methods and modification agents were investigated in great details. Furthermore, response surface methodology was applied to optimize the preparation conditions of peanut meal adhesive. The apparent viscosity and the Fourier transform infrared spectroscopy (FITR) of peanut meal adhesives were also evaluated to confirm the validity of the optimal preparation conditions. These results showed that hot-pressed peanut meal is a good candidate for adhesive materials and the addition of sodium dodecyl sulfate (SDS) improves the adhesive bonding strength. In addition, the regression model for the peanut meal adhesive preparation revealed statistical significance. Modification time and material liquid ratio had a significant effect on wet strength while the variables of modification temperature and the addition amount of modifier were insignificant. The optimal preparation conditions were determined as follows: modification temperature of 60?°C, modification time of 3?h, ratio of material to liquid of 1:3 and the addition amount of modifier of 3.2%. The average value of the adhesive bonding strength of 1.05?±?0.07?MPa was obtained, which is close to the predicted value. Under these conditions, the best wet strength and adhesive performance were achieved for the plywood.     

大豆蛋白胶竹材胶合板制作工艺的研究

以大豆蛋白胶为竹材胶合板的无甲醛胶黏剂,研究了胶合板的热压工艺。结果表明,大豆蛋白胶的竹材胶合板的最佳热压工艺参数:热压时间50 min,热压压力17 MPa,热压温度140℃,施胶量400 g/m2。在此条件下,胶合板在胶合强度和耐水性方面均高于国家标准Ⅱ类胶合板要求。     

Evaluation of corn germ protein as an extender in plywood adhesive

This study was conducted to evaluate the potential of wet-milled corn germ protein as an extender in plywood adhesive. Partially defatted dried corn germ from wet-milling, containing 2.1% (dry basis, db) crude oil and 24.7% (db) crude protein, was ground to 40-mesh particle size to produce the meal. The predominant water- and saline-soluble proteins were extracted from the corn germ meal (CGM) by using 0.1?M NaCl as solvent in a method that used homogenization, centrifugation, dialysis, and freeze-drying. The recovered freeze-dried protein extract (FDPE) was substituted (on protein content basis) for wheat flour in the standard adhesive mix for sprayline coaters. Adhesive containing CGM was also prepared in the same manner. Mixing and adhesion properties of the corn germ-based adhesives were compared with those of the industry standard adhesive. The adhesive containing FDPE showed dispersibility and mixing behaviors, as well as viscosity values that were almost identical to those of the industry standard and superior to those of CGM adhesive. The mean wet tensile strength of the adhesive containing FDPE was notably greater (1.71?MPa) than that of CGM-based adhesive (1.34?MPa) and wheat-based standard adhesive (1.38?MPa), which indicated stronger bonding. The results demonstrated that corn germ protein has the potential to be an alternative protein extender in plywood adhesives for sprayline coaters.     

The reduction of adhesive application in plywood manufacturing by using nanocellulose-reinforced urea-formaldehyde resin

The aim of the study was to investigate the effect of nanocellulose (cellulose nanocrystals [NCC]) addition to urea-formaldehyde (UF) resin on the properties of plywood and the possibility of reducing resin spread rate in plywood production. The studies have shown the increase in viscosity of experimental adhesive mixture in comparison with reference one. On the basis of the bonding quality results, it was concluded that the NCC-reinforcement led to significant improvement in bonding quality of plywood. Moreover, values of bending strength (modulus of rupture) and modulus of elasticity also increased because of the cellulosic nanoparticles introduction. The positive effect of NCC addition on the properties of plywood allowed the reduction of resin spread rate by 50 g/m² and maintaining equally good strength as reference panels. The modification with nanocellulose itself did not lead to a decrease of free formaldehyde content. However, allowing the reduction of adhesive application led to a slight decrease in the amount of emitted formaldehyde.     

草浆造纸黑液用于人造板胶粘剂的研究

用造纸黑液、酸析后的木质素为原料制取了不同固含量的木质素酚醛树脂，采用热压机在1．2MPa压力、热压时间5min、温度140℃进行固化成型，分别测试了直接采用黑液和采用酸析后的木质素制成胶粘剂的剪切强度，并分析了苯酚取代量与剪切强度的关系。     

水性聚氨酯胶粘剂研制现状及发展趋势

简述了国内外水性聚氨酯胶粘剂的发展状况、性能特点、主要应用及性能改进。     

Novel whey protein‐based aqueous polymer‐isocyanate adhesive for glulam

Whey, a by‐product of cheese making, contains whey proteins, lactose, vitamins, and minerals. Whey and whey proteins are still not fully used. In this study, whey protein‐based aqueous polymer‐isocyanate (API) adhesives were developed and characterized by bond test, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscope (SEM) for bond strength, chemical structures, and morphology. The optimized whey protein‐based API adhesive for Glulam had a 28‐h boiling‐dry‐boiling wet strength of 6.81 MPa and a dry strength of 14.34 MPa. Results indicated that the addition of polyvinyl acetate emulsion can prolong the work life of the API adhesive. Addition of crosslinker polymeric methylene bisphenyl diisocyanate (P‐MDI) not only increased the cohesive strength of the cured adhesive by crosslinking whey proteins but also resulted in strong chemical bonds via urethane linkage in wood bondlines. Addition of polyvinyl alcohol (PVA) further increased the crosslinking density of the cured adhesive due to its capability of crosslinking whey proteins through the reaction with P‐MDI. Nanoscale CaCO₃ powder (3.5 wt %) as filler significantly improved bond strength due to its mechanical interlock with the polymers in the adhesive. SEM examinations confirmed that both PVA and nanoscale CaCO₃ improved the compatibilities of the components in the optimized whey protein‐based API adhesive. FTIR results revealed that P‐MDI reacts mainly with the residual amino groups rather than the hydroxyl groups of whey proteins. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

双组分水性丙烯酸酯复膜胶的研究

以丙烯酸丁酯（BA）、甲基丙烯酸甲酯（MMA）、丙烯酸（AA）等为主要原料合成了丙烯酸酯乳液,加入固化剂,得到双组分水性丙烯酸酯复膜胶。研究了丙烯酸、固化剂含量,软硬单体比例以及交联剂和不同乳化剂对产品性能的影响。实验结果表明,当丙烯酸占单体总量的2％,固化剂为6％,软／硬单体质量比为1.36,固化时间为4h时,所得的双组分水性丙烯酸酯复膜胶的性能较佳。