植物源抗菌抗病毒助剂应用于浸渍胶膜纸饰面细木工板的实验室研究

研究耐高温植物源抗菌抗病毒助剂与三聚氰胺甲醛浸渍树脂适配性能,使用抑菌圈法确认助剂添加比例,并进行耐高温性能评估,探讨植物源抗菌抗病毒助剂在浸渍胶膜纸饰面细木工板应用的可行性。结果表明,植物源抗菌抗病毒助剂能与浸渍树脂互溶,热压后抗菌抗病毒颗粒能够均匀分布在胶膜纸表面,130～200℃高温热压后仍具有良好的抗菌性能。抗菌抗病毒助剂添加量为1%时,制得的浸渍胶膜纸具良好的抗菌抗病毒效果。该浸渍胶膜纸压贴制备的抗菌抗病毒饰面细木工板表面对甲流病毒（H3N2）抑制率达80.83%,对大肠杆菌抑制率达99.99%。     

银离子抗菌干法腈纶的研制开发

介绍了一种新型的HN-300型银离子无机抗菌剂的抗菌原理和特性,阐述了开发生产抗菌干法腈纶的方法和技术.经过一系列实验,确定了银离子无机抗菌剂添加到纤维中的比例.通过原液制备、纺丝、丝束水洗、卷曲和烘干等工艺,制得了含有1%抗菌剂的干法腈纶纤维产品,纤维具有良好的可纺性能,能满足消费者对保健纺织品日益增长的需求,抗菌干法腈纶纤维及其后加工纺织品都有很好的永久性抗菌性能.结果表明,HN-300型银离子无机抗菌剂在纤维中分散均匀,纤维对金黄色葡萄球菌、大肠杆菌的抗菌率均达99%以上.同时,纤维的抗菌性能耐水洗、耐热,具有持久性.     

抗菌及抗红外线加工对尼龙棉混纺织物数字印花色彩性及机能性的影响

将尼龙/棉混纺织物进行数位印花颜料喷印后,添加不同浓度抗菌剂及红外线吸收剂加工后处理,探讨添加抗菌剂及红外线吸收剂对尼龙/棉混纺织物的印花色彩性、耐水洗牢度、耐摩擦牢度、抗近红外线性能、抗菌性能的影响。结果表明,红外线吸收剂及抗菌剂添加后,对布面的外观力度及色相的影响不显著。数印织物经PU树脂后处理,能够提升水洗牢度及耐摩擦牢度2～3级。以红外线吸收剂1%处理数印织物后,经红外线热像仪测试可以达到良好的红外线遮蔽效果。除此之外,数印织物经抗菌加工可发现,随着抗菌剂浓度增高其抗菌效果愈好,且抗菌剂对金黄色葡萄球菌之效果较大肠杆菌佳,尤其抗菌剂质量分数达1%时灭菌率可达98%以上。数位印花的多机能性加工经过适当工艺程序可达到实用效果。     

不同聚乳酸膜的抗菌性比较

为了研究添加抗菌剂后,聚乳酸复合膜的抗菌性能,选取了壳聚糖、茶多酚、MgO和银四种抗菌剂,与聚乳酸形成四种复合膜,对比了不同抗菌剂的效果,并利用红外光谱仪对复合膜的结构进行了表征。实验发现,无论哪种抗菌剂,均表现了良好的抗菌效果。当壳聚糖/聚乳酸、茶多酚/聚乳酸均按质量比5:5组成复合膜时,抗菌率分别为68.54%和70.26%,当MgO的添加量为2%时,抗菌率为71.01%,而银表现出了极强的抗菌效果,添加量为1%时,抗菌率达到了98.53%。透光率随着抗菌剂的加入都有不同程度的减小,其中茶多酚的影响最大,从88.67%下降到33.75%。薄膜DSC曲线显示,未添加抗菌剂时,薄膜T_m为80.3℃,添加Ag和MgO后,薄膜T_m分别下降了1.7℃和1.4℃,说明抗菌剂的添加对薄膜T_m几乎无影响。由此可以看出,天然抗菌剂的抗菌效果要略差于无机抗菌剂。     

《饰面用浸渍胶膜纸》对指导生产的分析

1 饰面用浸渍胶膜纸及其用途 饰面用浸渍胶膜纸(简称胶膜纸,标记SJ)即由专用纸浸渍氨基树脂(主要是三聚氰胺树脂)或酚醛树脂,并干燥到一定团化程度的一种浸渍纸。该胶膜纸经热压可直接粘合或覆贴在人造板表面进行装饰加工,它不仅能遮盖住人造板表面的部分缺陷,美化外观,提高人     

离型纸在三聚氰胺浸渍胶膜纸饰面人造板生产中应用探究

探索不同纹理的离型纸在三聚氰胺浸渍胶膜纸饰面人造板生产中的应用,通过选用匹配的压贴设备、调整压贴参数,研究其加工可行性.研究结果表明,离型纸可用于压贴三聚氰胺浸渍胶膜纸饰面人造板,并且展现出钢模板无法实现的效果,具有广阔的应用前景.     

人造板饰面及饰面压机

1.人造板的饰面材料及饰面工艺1.1 饰面材料 根据不同的用途,有各种各样的贴面材料。比较常用的有微薄木,三聚氰胺纸,PVC薄膜,装饰纸等,本文以介绍微薄木和三聚氰胺纸为     

抗菌塑料在冰箱上的应用研究

新冠疫情过后，人们对于抗菌材料的使用需求越来越强烈，冰箱产品材料抗菌已成为市场趋势与卖点，现主要介绍冰箱塑料抗菌剂选择与验证应用情况。从验证结果来看，冰箱常用塑料选择无机锌银抗菌剂且以抗菌色母方式添加，具有安全性高，材料性能影响较小等优点；同时添加0.3%无机锌银抗菌剂至PS与PP基材中，及添加0.5%无机锌银抗菌剂至ABS基材中，抗菌率均达到99.9%。     

载银羟基磷灰石抗菌剂的研究和应用

很多金属离子具有抗菌作用,其中银离子抗菌能力最强,抗菌谱广,对人体安全.羟基磷灰石(简称HA)的生物相容性及生物活性良好,热稳定性好.通过离子交换,将银离子负载在HA上,得到载银羟基磷灰石抗菌剂,应用在皮革的湿加工的后期和喷涂工序中,其适用范围比光催化型抗菌剂广,耐高温性能比其它无机载银抗菌剂好,是一种很有应用前景的无机抗菌剂.本文对载银羟基磷灰石抗菌剂的制备、抗菌机理、抗菌性能和应用进行了综述,并对存在的问题进行了探讨.     

人造板功能型饰面技术研究进展

饰面人造板在室内装饰中应用广泛,随着人们生活质量的提高,对饰面人造板的功能化需求增加。本文从无醛、除醛、负离子、抗菌抗病毒、释香、阻燃、疏水等方面总结我国功能型饰面人造板技术的研究进展,为饰面人造板生产和研发提供技术参考。     

Dynamic mechanical properties of decorative papers impregnated with melamine formaldehyde resin

Papers impregnated with melamine formaldehyde based resins are widely used in decorative surface finishing of engineered wood based panels for indoor and outdoor applications. For cost-effective production of high-quality impregnated papers it is of great importance to understand the complex interplay between manufacturing conditions and technological property profile. In the present study, three raw papers from different suppliers were impregnated with melamine formaldehyde resin in an industrial scale experiment to study the influence of some important manufacturing variables on the processability of impregnated papers. As numerical factors the resin loading, the final moisture content and the amount of curing catalyst were systematically varied according to a statistical central composite design. The model papers were analyzed for their rheological and thermal properties using the dynamic mechanical method developed by Golombek. As target values flow time, cure time, curing rate and flexibility were used to calculate quantitative models for the processability of the impregnated papers using response surface methodology. It is shown that the relevant rheological and thermal paper parameters are significantly influenced by the supplier of the raw paper as well as the manufacturing variables.     

纤维表面改性对瓦楞原纸环压强度的影响

该文通过纤维表面改性来提高瓦楞纸环压强度,探讨了打浆、添加三聚氰胺树脂以及聚酰胺多胺环氧氯丙烷对瓦楞纸环压强度的影响。实验得出:最佳打浆度应该在32～40°SR之间,三聚氰胺树脂药品用量1.0%,处理时间40min,处理温度120℃;聚酰胺多胺环氧氯丙烷药品用量0.5%,处理温度60℃,处理时间20min。     

Untersuchungen an Holzwerkstoffen für Möbel-Einlegeböden

The bending deflection of six different wood based materials used as shelves in the manufacture of furniture (unlaminated particleboard, melamine laminated particleboard, veneered particleboard, block-board, plywood and solid wood panel) of approximately equal thickness was investigated. Deflection data were obtained by applying loads to the board surfaces for a period of 28 days followed by a period of unloading of equal length. For all types of particleboards the deflections appeared to be greater than for the other wood based panels. The lowest bending deflection was found for the solid wood panel while plywood performed better than blockboard. Surface treatments improved the performance of particleboards but veneering appeared to be more advantagous than laminating with melamine. The bending deflection of the tested panels is strongly related to their bending strength and modulus of elasticity.     

Recycling melamine-impregnated paper waste as board adhesives

Melamine impregnated paper offcuts and waste has been shown to be usable both directly, in finely powdered form, as a binder for particle board and as a melamine substitute during the formulation and preparation of liquid MUF resins. Both approaches were based on the residual activity of the MF resin present in the resin. Amounts of waste melamine paper of 22% on dry wood, equivalent to 10% melamine resin solids on total dry panel weight, were shown necessary for water resistant particleboard, and 18.5% for interior particleboard. Due to problems connected to excessive viscosity increase only a maximum of 25% of the total melamine in the formulated melamine resin could be substituted to good effect in the formulation of liquid MUF resin adhesives.     

三聚氰胺甲醛树脂在阻燃型空气滤纸中的应用

采用磷系阻燃剂制备内燃机用阻燃型空气滤纸,并用三聚氰胺甲醛树脂替代部分苯丙乳液进行增强,研究其对阻燃剂用量的影响.结果表明,15％的三聚氰胺甲醛树脂和85％的苯丙乳液进行复配后,阻燃剂的留着率在14％时即可获得优异的阻燃性能,可节约22％的阻燃剂用量,且不会降低滤纸的力学性能.     

Particleboards production from date palm biomass

Date palm biomass is a renewable natural resource that has not widely been utilized in industry. The objective of this study was to examine some chemical properties of date palm trunk and rachis (holocellulose, cellulose, lignin and extractives) and to evaluate their suitability to produce composite panels. Particleboards were produced using trunk and rachis as an alternative raw material for forest products industry in the presence of two types of polycondensation resins (phenol–formaldehyde and melamine urea–formaldehyde) which were selected as binding agents. The panels were tested for their physical (water absorption and thickness swelling) and mechanical (modulus of rupture, modulus of elasticity and internal bond strength) properties. The internal bond strength of date palm trunk and date palm rachis based boards met the requirements of the general purpose product standards (EN 312) at 0.70 g/cm³ density. The panels made with phenol–formaldehyde resin showed better performance with respect to the panels made with melamine urea–formaldehyde. In addition, the particleboard made with date palm trunk particles had better quality compared to the particleboard made from date palm rachis particles. Based on preliminary results of this work, raw materials from date palm trunks and rachis can have a promising potential in the manufacture of particleboards and as a substitute for wood in board production.     

On the performance of a melamine–urea–formaldehyde resin for decorative paper coatings

The decorative laminates industry is a highly competitive industrial sector. To be profitable, manufacturers of impregnated papers for surface laminated MDF and particleboards need to significantly reduce their production costs. Melamine formaldehyde resin (MF) formulations are commonly used for impregnation and coating of such papers, melamine being an important, but costly raw material used in high quantities. While MF is substituted by cheaper urea formaldehyde resins (UF) in the core impregnation, for paper surface films pure MF is used. Therefore, a further reduction in cost could be achieved if a portion of the melamine in the surface film was replaced by urea. In the present contribution, recent results of technological tests on paper laminates using a novel melamine–urea–formaldehyde resin (MUF) formulation are reported and their performance is compared to traditional surfaces made from MF.     

Effects of formaldehyde/urea mole ratio and melamine content on the hydrolytic stability of cured urea-melamine-formaldehyde resin

The influence of formaldehyde/urea (F/U) mole ratio and melamine content on the hydrolytic stability of urea-melamine-formaldehyde (UMF) resin was investigated. The hydrolytic stability of cured UMF resin was determined by measuring the mass loss and the liberated formaldehyde concentration after acid hydrolysis. A higher F/U mole ratio and greater melamine content of UMF resins resulted in lower hydrolytic stability. These results indicated that higher F/U mole ratio and greater melamine content resulted in more branched network structure, which subsequently increases the susceptibility of cured UMF resin toward acid hydrolysis.     

Effects of formaldehyde/urea mole ratio and melamine content on the hydrolytic stability of cured urea-melamine-formaldehyde resin

The influence of formaldehyde/urea (F/U) mole ratio and melamine content on the hydrolytic stability of urea-melamine-formaldehyde (UMF) resin was investigated. The hydrolytic stability of cured UMF resin was determined by measuring the mass loss and the liberated formaldehyde concentration after acid hydrolysis. A higher F/U mole ratio and greater melamine content of UMF resins resulted in lower hydrolytic stability. These results indicated that higher F/U mole ratio and greater melamine content resulted in more branched network structure, which subsequently increases the susceptibility of cured UMF resin toward acid hydrolysis.     

Effects of resin open time and melamine addition on cold pre-pressing performance of a urea–formaldehyde resin

The pre-pressing performance of urea formaldehyde resins has a significant impact on plywood production efficiency. This paper reports on the effects of the time elapsed after the addition of the hardener (“resin open time”) and of a melamine addition on the cold pre-pressing performance of UF resins. The changes in pH and viscosity, the thermal behaviour, and the structural composition as well as the performance during cold pre-pressing of veneers were investigated. Cold pre-pressing performance was measured by testing pre-pressed three-ply plywood stacks. The results showed that the cold pre-pressing performance is enhanced with longer time after preparation of the resin mix before application onto the veneers and also by longer pre-pressing times. All plywood stacks with at least 2 h pre-pressing time reached the so-called G1 grade (where the re-opened area of the cold pre-pressed plywood stack was 0), which meets the industrially accepted requirements for plywood fabrication. Further, the addition of melamine improved the cold pre-pressing behaviour compared to the investigated UF resin without melamine, showing an earlier start of the development of the pre-pressing shear strength and higher G grades at the various cold pressing times. There are two main reasons for the enhanced cold pre-pressing performance of the resin under the investigated conditions: (1) influence of the “resin open time”: a certain further condensation of the resin after preparing the glue mix (addition of hardener) leading to increased molar mass and viscosity ultimately transforming the resin from liquid-state to gel-state; (2) a higher methylol content in the resin after incorporation of melamine into the resin, which enhanced the formation of hydrogen bonds between the resin and the wood surface. These conclusions represent a feasible approach for the improvement of the cold pre-pressing properties and thus the practical applicability of UF resins with low molar ratios.