环保型酚醛树脂粘合剂的研制及粘接性能

对酚醛树脂粘合剂的合成进行了研究 ,采用将甲醛和苯酚在不同反应阶段分批加入的工艺流程 ,使得粘合剂产品在符合粘接性能要求的基础上 ,有效地降低了产品的游离甲醛和制板后甲醛释放量。用该粘合剂粘接的胶合板甲醛释放量不超过 0 .0 5mg·L-1,远远低于国家标准。该粘合剂也适用于竹板的粘接 ,它是一种比较理想的低毒环保型酚醛树脂粘合剂     

低毒脲醛树脂粘合剂工业生产方法

介绍一种含游离甲醛低的粘接强度大的工业生产脲醛树脂粘合剂的方法。由于在甲醛一次加入后 ,在一定的 pH值 ,温度下分三批加入尿素进行阶段反应 ,从而获得一种胶液性能稳定 ,粘接的制品质量好 ,强度高的胶合板、碎木板、刨花板、纤维板等用的粘合剂。     

第二十二讲 聚合物粘接炸药中的聚氨酯粘合剂系统

聚合物粘接炸药（PBX）是用聚合物粘合剂将炸药颗粒粘接成一体的炸药。当今,在PBX中最常用的粘合剂系统是聚氨酯基粘合剂,同时,为了便于制造或调节力学性能和化学稳定性,粘合剂系统中还要加入增塑剂和其它助剂。本文介绍了PBX用粘合剂的发展历史、聚氨酯粘合剂系统的组分及其性能、配方设计、试验和质量控制的基本内容,特别介绍了澳大利亚国防科技组织（DSTO）所进行的工作。     

新型可见光固化口腔正畸粘合剂研制

介绍了一种新型可见光固化正畸粘合剂的组成、性能及正畸粘接的工艺。此粘合剂由一种单组分液体底胶和单组分糊剂组成。与化学固化粘合剂相比,其操作使用方便,固化时间短。这种新型粘合剂的粘接强度完全满足了正畸粘合剂的要求。     

异氰酸酯粘合剂可生产秸秆人造板

烟台万华聚氨酯股份有限公司自主研制开发的不合甲醛、无毒无害、环保型异氰酸酯粘合剂，可替代传统的“三醛”胶用于生产秸秆人造板，强度高，耐水性好，加工使用方便。该粘合剂是国内惟一能以小麦秸秆为原料制作板材的粘合剂，解决了小麦秸秆无法高附加值利用的一大难题。所生产的农作物秸秆板材性能可与高中档密度纤维板相媲美。     

浇注型聚氨酯弹性体/硫化橡胶粘接性能影响因素研究

介绍了CPUE(浇注型聚氨酯弹性体)与硫化橡胶之间粘接强度的影响因素,分别从粘合剂的类型、橡胶表面处理方式、表面处理剂及其浓度等方面考察了影响硫化橡胶与CPUE之间粘接强度的主要因素。结果表明:对橡胶表面进行机械打磨并用浓度为2%～3%的三氯异氰尿酸丙酮溶液进行化学处理,有利于硫化橡胶与CPUE之间粘接强度的提高;当活化时间超过1.5 h时,粘合剂的活化程度较高,粘接效果较好;粘合剂224-2的粘接效果优于粘合剂5190S-2。     

多元酚—甲醛树脂粘合剂的研究

一、概述 1、多元酚——甲醛树脂简介多元酚甲醛树脂是一种以粗酚为原料,经过物理过程与化学反应研制而成的水溶性、热固型的粘合剂,它主要用作Ⅰ类胶合板、水泥模板(俗称壳子板)、防水防潮刨花板、纤维板的粘接。用它粘接Ⅰ类胶合板与水泥模板,其粘接强度,达到国际GB738—75规定之标准。多元酚——甲醛树脂属酚醛树脂的系列,它的主要优点是粘接强度高,耐水性、耐热性强与防     

几种塑料的粘接方法

介绍了常用塑料的粘接方法及粘接前的预处理,重点介绍了环氧类、尿烷类及热固型丙烯酸粘合剂。     

化工实用技术资料

009 一种帖接性能优异的含氟聚合物帖合剂 研究一种含氟聚合物为主体材料制备用于聚四氟乙烯粘接的粘合剂,探讨了固化剂和金属氧化物对该粘合剂粘接性能的影响,分析了表面改性剂的改性作用。并考察了用于不锈钢粘接的情况。 100 新型纸——铝箔复合胶的研制 介绍了一种通过加入少量丙烯酸共聚改性的醋酸乙烯酯乳液的制备方法,该胶用于纸—铝箔的复合粘接,具有粘接力强、快干、抗冻性优良等特点。 101 铸造用聚氨酯粘合剂 扼要介绍翻砂用合成树脂粘合剂的技术进展,重点介绍聚氨酯粘合剂冷硬法技术的四种工艺方法。 102 汽车用半结构胶的研制 介绍采用聚氨酯改性环氧树旨制备半结构胶的方法、性能及应用情况,重点讨论聚氨     

紫胶改性酚醛树脂胶粘剂的研究

紫胶是一种具有多种用途的天然树脂,利用紫胶改性酚醛树脂胶粘剂,有利于扩大紫胶的应用范围,提高对可再生资源的综合利用。研究了对紫胶改性酚醛树脂胶粘剂的固化时间、粘接胶合板的粘接强度和甲醛释放量进行了测定。结果表明:紫胶改性酚醛胶的固化时间与普通酚醛胶接近,粘接胶合板的粘接强度达到Ⅰ类胶合板的要求,胶合板的甲醛释放量降低。因此,用紫胶改性酚醛树脂胶粘剂是可行的。     

Investigation of epoxy-based wood adhesives

Cold-set epoxy-based wood adhesives were investigated for production of exterior plywood. Effective adhesives were composed of bisphenol A diglycidyl ether (BPADGE), polyamidoamine (PAA), and polyethylenimine (PEI). Three-ply plywood panels were prepared with BPADGE–PAA–PEI adhesives and evaluated for their strengths and water resistance in accordance with a standard for exterior plywood. The effect of BPADGE/(PAA + PEI) weight ratio, PAA/PEI weight ratio, the mixing time for preparing the adhesive, and the pressing time for making plywood panels on the water resistance and the shear strengths of the plywood panels was investigated. The pot life of the adhesive was also measured. Plywood panels made with the BPADGE–PAA–PEI adhesives met the industrial requirements for exterior applications. Adhesion mechanisms are discussed in detail. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47741.     

Effects of typical soybean meal type on the properties of soybean-based adhesive

In order to effectively apply soybean meal for the preparation of water-resistant soybean-based adhesives for plywood, the effects of three typical soybean meal products, namely, low-temperature soybean meal (LM), high-temperature soybean meal (HM), and physical soybean meal (PM), on the properties of soybean-based adhesive were investigated. The results indicated that the number of reactive groups in the three soybean meals followed the order LM > HM > PM, which in turn led to various crosslinking densities when these soybean meals were crosslinked by epichlorohydrin-modified polyamide (EMPA) during the curing process. The LM soybean adhesive had 6.6% higher soaking bond strength and 16.5% higher boiling-dry-boiling bond strength than the HM soybean adhesive, and 19% higher soaking bond strength and 33% higher boiling-dry-boiling bond strength than the PM soybean adhesive, respectively. These three soybean meals could be used to prepare soybean adhesives for interior-use plywood because all plywood panels bonded with their adhesives passed a water-soaking test at 63 °C for 3 h, but only the LM soybean adhesive achieved the desired water resistance for floor-base plywood. Among the three evaluated soybean meals, LM was the most promising raw material for the preparation of soybean-based adhesive because of a greater number of reactive groups, higher crosslinking density, and superior bond strength. Plywood panel bonded with HM soybean adhesive had a water resistance lower than, but very close to, the standard required value (>0.8 MPa) for floor-base plywood.     

Preparation of a New Type of Polyamidoamine and Its Application for Soy Flour-Based Adhesives

The most commonly used curing agents for soy-based adhesives are polyamines, which have the problem of low solid content and/or high viscosity. To overcome this problem, a new type of polyamidoamine (PADA) resin was synthesized and applied to soy flour-based adhesives to improve their water resistance. The PADA solution obtained had a high solid content of 50 wt% and low viscosity of 270 cP. The optimum weight ratio of soy flour/PADA/maleic anhydride to prepare adhesive was 40/7/1.68. The wet strength of plywood prepared at the optimum weight ratio was 0.82 MPa, which meant the plywood could be used as type II plywood according to the Chinese National Standard GB/T 9846.7-2004. The results of water-insoluble solid content measurement and SEM observation demonstrated that cured soy flour–PADA–maleic anhydride adhesive had a 16 % greater water-insoluble solid content than soy flour–NaOH adhesive. The cross-linking network formed by the reactions of PADA and MA would increase the water-insoluble solid contents and improve water resistance of cured soy flour-based adhesives.     

Comparative study of zein- and gluten-based wood adhesives containing cellulose nanofibers and crosslinking agent for improved bond strength

Many of the currently used wood adhesives contain chemicals that are harmful to human health and the environment. Increasing environmental and human health concerns have made the development of safe biobased adhesives a priority. In this study, two plant proteins, i.e., zein and wheat gluten, were used to develop wood adhesives and their performance was compared through simple lap shear tests and plywood flexural/internal bond tests in dry and wet conditions. To increase their bond strength, cellulose nanofibers were added to create nanocomposite adhesives and glutaraldehyde was also used to crosslink the proteins. Single-lap shear test was performed to measure the bond strength of different adhesive formulations and determine the optimal formulations and processing conditions. Fractured bond surfaces were studied using optical observation and scanning electron microscopy to determine bond failure mechanisms. Thermal and chemical properties of the adhesives were evaluated using thermogravimetric analysis and Fourier transform infrared spectroscopy, respectively. The bond strength of both zein and gluten adhesives was significantly increased by the addition of the cellulose nanofibers and/or glutaraldehyde, although the two adhesives responded differently to the two reinforcement materials due to the different solvents used to prepare the adhesives. The bond failure mode changed from cohesive failure of the adhesive to structural failure of the adherent for the gluten adhesive containing CNFs and glutaraldehyde. Potential zein and gluten adhesive formulations were used to produce plywood samples and their performance was assessed under different conditions. The formulations with industrial potential were discovered through this study.     

Influence of acrylamide copolymerization of urea–formaldehyde resin adhesives to their chemical structure and performance

To lower the formaldehyde emission of wood‐based composite panels bonded with urea–formaldehyde (UF) resin adhesive, this study investigated the influence of acrylamide copolymerization of UF resin adhesives to their chemical structure and performance such as formaldehyde emission, adhesion strength, and mechanical properties of plywood. The acrylamide‐copolymerized UF resin adhesives dramatically reduced the formaldehyde emission of plywood. The ¹³C‐NMR spectra indicated that the acrylamide has been copolymerized by reacting with either methylene glycol remained or methylol group of UF resin, which subsequently contributed in lowering the formaldehyde emission. In addition, an optimum level for the acrylamide for the copolymerization of UF resin adhesives was determined as 1%, when the formaldehyde emission and adhesion strength of plywood were taken into consideration. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

冷等离子体处理单板对不同胶黏剂胶合强度的影响

冷等离子体预处理单板后,采用不同的胶黏剂热压制成胶合板,比较空白板和处理后的胶合板的胶合强度,并对N2等离子处理前后单板表面的化学组成进行了XPS分析。结果表明,经等离子处理后,尿胶的胶合板的调高幅度最大,最高达到了88.42%,对于同种胶黏剂,N2,O2,Ar,NH3的效果是N2NH3ArO2。XPS分析结果表明经N2冷等离子体处理后,木材表面的氧/碳原子浓度比增加,产生了大量含氧官能团或过氧化物,同时引入了N元素,推测有-NH2生成。     

Plant Polyphenol-Inspired Crosslinking Strategy toward High Bonding Strength and Mildew Resistance for Soy Protein Adhesives

Soybean protein adhesives are environmentally friendly biomass-based aldehyde-free adhesives that have good economic value for the wood industry; however, it remains challenging to produce soybean protein adhesives with excellent water resistance, toughness, and mildew resistance through a simple modification method. In this work, inspired by plant polyphenols, a novel crosslinked soybean meal adhesive (SMPT) is obtained using a facile economic method. Polyamidoamine-epichlorohydrin (PAE) and tannic acid (TA) are combined with a soybean meal matrix to form a tough co-crosslinked network through strong intermolecular forces (covalent bonds, ionic bonds, and hydrogen bonds) in adhesive system. The results show that the wet bonding strength of SMPT adhesives for plywood is 134.1% higher than the unmodified soybean meal adhesive. The adhesion properties met the standard requirements for interior-use plywood. And the compact cross-linking network structure is accelerated the greater energy dissipation, which improves the toughness of adhesive. Moreover, cationic azetidinium groups in PAE and phenol hydroxyl groups in TA synergistically not only exhibit the good antibacterial activities but also improve mildew resistance for SMPT adhesives. This facile strategy provides an economic sustainable method to prepare high-performance environmentally friendly wood adhesives.     

葛根淀粉基胶黏剂制备与性能研究

研究开发以淀粉为主要原料的环保型胶黏剂替代"三醛类"木材胶黏剂,对彻底解决人造板及其制品的甲醛释放问题具有重要意义。以野生葛根淀粉为原料,通过降黏处理,并与聚醋酸乙烯酯和异氰酸酯复配,制备出胶合强度达到国家Ⅱ类要求的淀粉基木材胶黏剂。研究了降黏剂用量、降黏时间、聚醋酸乙烯酯和异氰酸酯用量对淀粉基木材胶黏剂胶合强度的影响。优化工艺条件下制备胶黏剂胶接胶合板的胶合强度为1.89 MPa,能够满足国家Ⅱ类胶合板强度要求。     

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.     

淀粉类胶粘剂的应用研究进展

综述了淀粉胶粘剂在胶合板工业、标签胶、瓦楞纸箱、建筑涂料和卷烟工业等领域中的应用研究进展。淀粉是一种可再生的天然高分子化合物,具有良好的粘接性能和成膜性能。淀粉胶粘剂具有环境友好、价格低廉和性能优良等特点,是一种发展潜力极大的胶粘剂。