三聚氰胺树脂硬挺整理常见问题分析及对策

阐述了织物在硬挺整理中会遇到的常见问题:整理时催化剂和渗透剂的选择、织物上游离甲醛超标、三聚氰胺树脂的稳定性和抗冻性、布面硬度和厚度、树脂花、白痕、霉点、色裂等.通过选择配套助剂和有效控制工艺可减少和克服这些常见问题.     

涤纶牛津布硬挺整理

分析了羟甲基化氨基树脂类硬挺剂TF-630在涤纶牛津布上进行硬挺整理的各工艺因素(树脂用量、催化剂TF-630C用量、焙烘温度和时间等)对整理效果的影响.试验结果表明,采用优化的各项工艺参数,不但能达到优良的硬挺效果,还能降低布面游离甲醛含量,减少刺激性气味.     

树脂整理的后焙烘工艺

阐述了树脂整理的后焙烘工艺及其影响因素.试验表明,该工艺的关键在于选择适合低温焙烘的树脂整理剂和稳定的催化剂.树脂整理液pH值应调节至4.5～5,用量以100～120 g/L为宜,催化剂用量以树脂整理剂用量的25%为宜;布面pH值应调节至中性,浸轧整理液后织物烘干温度控制在80～85 ℃,保证布面含潮率6%～8%落布,充分降温后均匀打卷;加入PU树脂能够提高织物平整度0.3～0.4级.所用的树脂整理剂EFR对织物色光影响不大,并且具有一定的储存稳定性.     

纯棉府绸低甲醛树脂整理工艺

采用低甲醛树脂整理剂对纯棉府绸进行抗皱整理.讨论了树脂用量、pH值、焙烘条件等因素对整理效果和织物性能的影响,优化的工艺条件为:树脂用量80g/L,pH值4.3,焙烘温度155℃,焙烘时间3.5 min,整理后织物的平整度提高、色差减少和强力损失降低.     

Migration of melamine and formaldehyde from tableware made of melamine resin

Migration of melamine and formaldehyde into food-simulating solvents from cups made of melamine resin was studied under various conditions. Little migration of melamine was observed in any unused cups kept at 60 degrees C for 30 min, room temperature (26 degrees C) for 1 h or cooled at -20 degrees C for several days. Migration of both compounds was strongly affected by heating and acidity. The highest migration of melamine into 4% acetic acid used as a food-simulating solvent was 42.9 +/- 7.2 ppm when the migration test was repeated seven times at 95 degrees C for 30 min. In this time, the migration of formaldehyde was 14.2 +/- 0.6 ppm into the solvent. The molecular ratio of the migration amount of formaldehyde to melamine decreased according to the formula Y = 9.15X-0.813 over seven repetitions of the test, and was maintained at about 1.6 between the 10th and 20th repetitions. The inner surface of the cups became tarnished during the repetition of the test and their roughness increased from 1 micron before the test to 2.5-5 microns after 20 repetitions of the test. Migration of melamine from the cups being used at a cafeteria was 0.4 +/- 0.5 ppm, but that of formaldehyde was undetectable when the cups were kept at 60 degrees C for 30 min with 4% acetic acid.     

轻薄弹力棉织物低甲醛防皱整理

采用低甲醛整理剂EFR-3C与弹性缓冲增强剂EDP配套使用,对轻薄弹力织物进行低甲醛防皱整理.通过正交试验,优选整理工艺为:整理剂EFR-3C 120 g/L,弹性缓冲增强剂EDP 40g/L,焙烘温度150℃,焙烘时间2 min,pH值6,纤维保护剂HI-40 40g/L,柔软剂P202 20 g/L.采用此工艺处理织物,回复角可达260°～270°.     

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.     

有机硅改性丙烯酸酯树脂对羊毛(绒)织物的抗起毛起球整理

有机硅改性丙烯酸酯树脂作为新型的羊毛(绒)抗起毛起球整理剂,符合环保要求,利用其对羊毛(绒)织物进行整理,确定了最佳工艺条件.结果表明:树脂用量5%,pH值6,架桥剂3%,柔软剂3%,浴比1:10,浴温30～40℃,烘干100～110℃时羊毛织物的抗起毛起球性能可获得较大提高.     

密胺餐具中三聚氰胺迁移量影响因素分析

目的 对密胺餐具中三聚氰胺迁移量影响因素进行分析。方法 以水、4%乙酸、50%乙醇3种溶剂为浸泡液, 在不同温度下浸泡不同时间, 其浸泡液过滤并用高效液相色谱-质谱法测定, 外标法定量。结果 密胺餐具中三聚氰胺的迁移量和迁移时间、迁移温度、迁移浸泡液相关。三聚氰胺的迁移量随着迁移时间增加、迁移温度升高而升高, 且在酸性模拟溶液中三聚氰胺的迁移量最大。浸泡液为4%乙酸时, 在100 ℃下浸泡1 h时, 三聚氰胺迁移量达到最大值, 密胺碗、饭勺、筷子的迁移量分别为1.94、1.35、1.61 mg/kg。结论 密胺餐具中的三聚氰胺在高温、酸性条件下易迁移, 建议消费者在使用过程中尽量避免在高温、酸性条件下使用, 选择大品牌的厂家生产的有QS标示的产品。     

On the warping behaviour of particleboards coated with melamine formaldehyde resin impregnated papers

Impregnated papers are widely used as decorative, protective and balance sheets in decorative laminates for the furniture, flooring and building industries. One important property of such composites is their warping behaviour. Especially for laminate flooring, warping of the lamellae is undesirable. In the present study the influence of important process parameters in the manufacturing of impregnated papers is quantitatively analyzed based on an industrial experiment carried out at an Austrian impregnation plant. Catalyst concentration, moisture content, resin loading and base paper supplier were varied according to an experimental design. The thermal properties of the impregnated papers and the warping behaviour of the corresponding boards were evaluated using response surface methodology. The resulting models allowed quantifying the relative importance of single factors on composite warp and defining the useful working range. Determination of the thermal properties of impregnated papers using DSC and TMA was not sufficient to predict laminate warp.     

On the warping behaviour of particleboards coated with melamine formaldehyde resin impregnated papers

Impregnated papers are widely used as decorative, protective and balance sheets in decorative laminates for the furniture, flooring and building industries. One important property of such composites is their warping behaviour. Especially for laminate flooring, warping of the lamellae is undesirable. In the present study the influence of important process parameters in the manufacturing of impregnated papers is quantitatively analyzed based on an industrial experiment carried out at an Austrian impregnation plant. Catalyst concentration, moisture content, resin loading and base paper supplier were varied according to an experimental design. The thermal properties of the impregnated papers and the warping behaviour of the corresponding boards were evaluated using response surface methodology. The resulting models allowed quantifying the relative importance of single factors on composite warp and defining the useful working range. Determination of the thermal properties of impregnated papers using DSC and TMA was not sufficient to predict laminate warp.     

三聚氰胺改性脲醛树脂胶在MDF生产中的应用

本文叙述了用三聚氰胺改性脲醛树脂胶的方法,并对改性胶进行了理化分析,提出了改性脲醛胶在中密度纤维板生产中的应用方法。