"China Adhesives" 2023 Issue 1 Abstract

  • Date:   2023-01-31      
  • Author:   CATIA      
  • Source:   CATIA      

Scientific Research Report

Preparation and characterization of high performance waterborne wood adhesive

Yu Guixun, Huang He

(College of Chemistry, Chemical Engineering and Materials Science of Soochow University, National and Local Joint Engineering Laboratory of Advanced Functional Polymer Materials, Suzhou    215123, Jiangsu, China)

AbstractA kind of low viscosity styrene-acrylate copolymer emulsion (SAEP) was prepared by semi-continuous emulsion polymerization with butyl acrylate, styrene and other functional monomers as main components. The effects of the type of polyvinyl alcohol, the particle size of calcium powder and the amount of curing agent on the properties of SAEP adhesive were investigated by orthogonal experiment. The research results showed that when polyvinyl alcohol BP17 was used, the particle size of calcium powder was 12 μm, and w(curing agent)=13%, the actual pot life of SAEP adhesive could reach more than 70 min. The maximum dry shear strength of SAEP adhesive was 16.6 MPa, the wet shear strength of the adhesive measured by hot water immersion method was up to 7.1 MPa, and the shear strength measured by repeated boiling method was also up to 5.5 MPa. Under the same formulation conditions, compared with the classic commercial EP4 emulsion, SAEP had a similar pot life (static fluidity determination method of emulsion) to EP4 emulsion, and the maximum dry shear strength was almost the same, but SAEP adhesive had higher wet shear strength.

Keywordshigh performance wood adhesive; styrene-acrylate copolymer emulsion; polyvinyl acetate emulsion; polyvinyl alcohol


Study on synergistic enhancement of underwater adhesive by multiple interactions

Sun Zaizheng1,2, Fan Zhiqin1, Mao Dongsheng2, Chen Haiming2

(1.School of Sciences, Henan University of Technology, Zhengzhou  450001, Henan, China; 2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo  315201, Zhejiang, China)

AbstractThe complexity of underwater bonding environment has led to additional challenges in the development of underwater adhesive. How to quickly and effectively destroy the interface hydration layer and realize the strong bonding between the adhesive and the bonded interface are two major difficulties faced by underwater adhesive at present. In this study, the random copolymers of benzyl methacrylate (BMA) and [1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide][methacryloxyethyl trimethylammonium salt] ([MATA+][TFSI-]) were prepared by photoinitiated free radical copolymerization, and the polymer/ionic liquid complex with multiple interactions were constructed by the strategy of introducing ionic liquid. By changing the mass ratio of two monomers and the content of ionic liquid, Young's modulus, fracture strength, and fracture toughness could be well controlled. The rich multiple interactions within the polymer/ionic liquid complex enabled strong bonding under water to a wide range of material surfaces, including metals (stainless steel, metallic aluminum), inorganic non-metals (glass), polar polymers (polyimide) and non-polar polymers (polypropylene, polytetrafluoroethylene), and other types of substrates, among which the bonding strength to stainless steel reached 250 kPa, which was much higher than those reported for other underwater adhesive.

Keywordsionic gel; underwater bonding; adhesive; bonding strength; physical interaction


Effect of silane modification on properties of one-component moisture curing polyurethane adhesive

Lai Jiaqi1, Guan Chao1, Zhu Yunfeng1,2, Zhou Jian2, Yan Yurong2

(1.School of Chemistry and Chemical Engineering, Jiangsu University of Technology, Changzhou  213001, Jiangsu, China; 2.Suzhou Xiangyuan New Materials Co., Ltd., Suzhou  215001, Jiangsu, China)

AbstractSilane-modified one-component moisture curing polyurethane adhesive (SPU) was prepared with 3-mercaptopropyl trimethoxysilane. The structure of SPU adhesive was analyzed by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, gel permeation chromatography and scanning electron microscopy, and the influence of silane content on the mechanical properties, bonding properties and hardness of SPU adhesive was measured by universal electronic testing machine and Shore A hardness tester. The research results showed that 3-mercaptopropyl trimethoxysilane was successfully reacted to the polyurethane molecular chain, reducing the content of isocyanate group (NCO) in the system. With the increase of silane content, the tensile strength and tensile shear properties of SPU adhesive increased, the hardness decreased, and the surface drying time was prolonged. When the silane content was 110% of the theoretical amount, the tensile strength and tensile shear strength of SPU adhesive were 0.58 MPa and 0.72 MPa, respectively, which were 7.41% and 63.64% higher than that of pure PU adhesive. The bubbles generated during curing of SPU adhesive were significantly reduced and the appearance was obviously improved.

Keywordsone-component polyurethane adhesive; silane modification; bubble; mechanical property; tensile shear strength


Preparation of PE-g-MAH adhesive and study on its bonding properties in barrier film

Liu Yuqian1, Lyu Tongjian1, Chen Limeng2, Dong Shuhui2

(1. College of Chemistry, Liaoning University, Shenyang  110036, Liaoning, China;2. Shenyang Ketong Plastic Co., Ltd., Shenyang  101142, Liaoning, China)

AbstractMaleic anhydride grafted polyethylene (PE-g-MAH) was prepared by twin-screw melt extrusion. On the basis of linear low density polyethylene (LLDPE) as the matrix resin, the effects of different kinds and contents of initiators, different contents of grafted monomer maleic anhydride on the properties of PE-g-MAH prepared were discussed. At the same time, the influence of PE-g-MAH adhesive with different graft ratios, melt flow rates and number of crystal points on the bonding properties of ethylene-vinyl alcohol copolymer (EVOH) barrier film was also investigated. The grafted products were qualitatively characterized by Fourier transform infrared spectroscopy and the graft ratio of the grafted products was analyzed, the flowability was analyzed by melt flow rate test, and the bonding properties of the adhesive were analyzed by 180° peel strength test. The research results showed that when the initiator was dicumyl peroxyide (DCP) and 0.05 phr was added, and 1 phr of MAH was added at same time, the graft ratio of PE-g-MAH was 0.68%, the melt flow rate was 0.94 g·(10 min)-1, and the number of crystal points was 12, the bonding performance of the material was the best at this time. EVOH was selected as the barrier layer for bonding, when the graft ratio was 0.68%, the peel strength of PE-g-MAH reached the maximum value of 69.0 N/cm, and the bonding performance of PE-g-MAH adhesive was relatively the best.

Keywordsmaleic anhydride; adhesive; dicumyl peroxide; peel strength; ethylene-vinyl alcohol copolymer


 Development and Application

Preparation and properties of reactive polyurethane hot melt adhesive for motor sealing of home appliances

Cong Helei, Fang Jun, Lang Yichao

[Kangda New Materials (Group) Co., Ltd., Shanghai  201419, China]

AbstractNCO-terminated prepolymer was synthesized by using polyester polyol, polyether polyol and diphenylmethane diisocyanate as raw materials. At the same time, the reactive polyurethane hot melt adhesive used for motor sealing of home appliances was prepared by using thermoplastic resin, tackifying resin and other additives. The effects of isocyanate index, polyol structure and thermoplastic resin type on their properties were investigated. The molecular structure, thermal and mechanical properties were also characterized by infrared spectroscopy, synchronous thermal analysis, and electronic universal testing machine. The research results showed that when the isocyanate index range was 1.7-2.1, the mass ratio of polyester/polyether was 2:1, and the addition amount of thermoplastic resin was 20%, the prepared reactive polyurethane hot melt adhesive had good physical properties and bonding properties to different galvanized iron and aluminum, also had excellent high and low temperature resistance, water resistance and corrosion resistance, which conformed to the operation requirements of the rapid industrial assembly line, and could be used for motor sealing of home appliances.

Keywordspolyurethane; hot melt adhesive; fast curing; sealing; motor of home appliances


Study on high performance non-flowing prepreg

Li Zhenlin1,2, Hu Binyang2, Zhang Xueping1,2, Chen Wenqiu1,2, Fan Heping1,2

(1.Haiso Technology Co., Ltd., Wuhan  430074, Hubei, China;2. Hubei Research Institute of Chemistry, Jianghan University, Wuhan  430056, Hubei, China)

AbstractA kind of prepreg with excellent comprehensive performance was prepared by selecting electronic grade glass fiber cloth as the support carrier and immersing it in adhesive with high-temperature resistant epoxy resin as the main resin. The bonding strength, reflow soldering, thermal stress, dielectric resistance, dielectric withstand voltage, dielectric constant, adhesive overflowing and coefficient of thermal expansion of the prepared prepreg were systematically studied. The research results showed that the prepared high performance non-flowing prepreg had excellent properties and could meet the demand of downstream customers for the production of rigid-flex PCB.

Keywordsnon-flowing; prepreg; study


Study on characteristics of removing Ca2+ from high-salt wastewater by ion exchange resin

Wu Xinsen, Yang Ye, Zhang Yang, Li Hong

(Shanghai Research Institute of Chemical Industry Co., Ltd., Shanghai  200062, China)

AbstractChelating ion exchange resin was used to treat calcium ion (Ca2+) in high-salt wastewater after defluoridation of fluorochemicals. The main influencing factors and adsorption performance of the resin in the static adsorption and dynamic adsorption of Ca2+ were investigated, and the adsorption performance of the resin after multiple adsorption-regeneration was tested. The research results showed that the maximum static adsorption capacity of the resin for Ca2+ was 35.1 mg/g. When the concentration of NaCl in wastewater was 150.0 g/L, the adsorption capacity of the resin for Ca2+ was only reduced by 5.2%, and the salt resistance of the resin was good. pH had little effect on the static and dynamic adsorption of the resin for Ca2+. During the dynamic adsorption process, the working adsorption capacity gradually decreased with the increase of flow rate, and the suitable flow rate should be in the range of 4-9 BV/h. When the resin was fully regenerated after saturated adsorption, the working adsorption capacity remained basically unchanged.

Keywordsion exchange resin; adsorption; working adsorption capacity


 Special Topics and Review 

High-performance thermal interface materials of thermal conductive adhesive: mechanism, status and trend

Xu Yonglun, Pang Yunsong, Ren Linlin, Sun Rong, Zeng Xiaoliang

(Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology Chinese Academy of Sciences, Shenzhen  518100, Guangdong China)

AbstractIn this paper, the basic mechanism and model of heat transfer and bonding of thermal conductive adhesive were reviewed. The development of thermal conductivity enhancement technology of thermal conductive adhesive in recent years was analyzed and summarized. The epoxy thermal conductive adhesive and silicone thermal conductive adhesive were introduced emphatically, and the influence of new material technology on thermal conductive adhesive was discussed. Finally, the problems of thermal conductive adhesive encountered at the present stage and the possible future research directions were prospected.

Keywordsthermal conductive adhesive; thermal interface material; coefficient of heat conductivity; thermal resistance; epoxy; silicone; self-repairing material


Current situation and future development of laminating adhesive prepared by emulsion polymerization for printing and packaging

Xia Yuzheng1, Shi Shuxian1, Ma Ji2, Chen Jianbo2

(1.College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing  100029, China; 2.Shandong Xinlongyu New Material Technology Co., Ltd., Jining  272622, Shandong, China)

AbstractThe waterborne laminating adhesive used in the field of printing and packaging has a history of 25 years. In the 25 years of development, from the initial development of a few companies to dozens of companies in 2006, and after more than 10 years of development, like other emulsion polymerization products, it gradually formed a monopoly situation. The paper-plastic lamination field was basically monopolized by eight companies, while waterborne lamination adhesive for plastic-plastic flexible packaging was basically monopolized by five companies. In this paper, the current situation and future development of laminating adhesive for printing and packaging were reviewed comprehensively, and effective solutions to the possible problems of crosslinking technology existing in different places of use for acrylate emulsion laminating adhesive in the field of printing and packaging in China were proposed.

Keywordsemulsion polymerization; laminating adhesive; preparation; technical bottleneck; current situation; future development


Research progress of two-component polyurethane structural adhesive for power battery in China

Deng Juan1,2, Gao Yan1,2, Liang Bin1,2, Li Jiming3, Wang Changyong3

(1.Guangzhou Mechanical Engineering Research Institute Co. Ltd., Guangzhou  510700, Guangdong, China; 2.SINOMACH Intelligence Technology Co., Ltd., Guangzhou  510700, Guangdong, China; 3.Suzhou Adhesive Technology Co., Ltd., Suzhou  215101, Jiangsu, China)

AbstractWith the rapid development of the new energy automobile industry in China, there are more and more research and development work on two-component polyurethane structural adhesive for power battery. In this paper, the public reports, research progress and industrial technical requirements of two-component polyurethane structural adhesive for power battery in China in recent years were collected and sorted out. The main performance research included flame retardancy, thermal conductivity, aging resistance, bonding applicability to PET and removable type. Finally, the future development was prospected.

Keywordspower battery; two-component; polyurethane; structural adhesive; patent for invention; technical requirement