Adhesive Technology Innovation Composite Materials - The 7th "Bonding Day" Bonding & Composite Technology Exchange Conference (Part 2)

The excitement continues on the second day of the conference! A total of 10 speeches were delivered by experienced experts from the fields of home appliances, rail transit, rubber factories, and Yifa.

Summary of conference speech

Chao Gaoyi, director of the testing center and senior lecturer of Yifa Bonding & Composite Materials Research Institute, the title of Mr. Chao’s speech is: A brief discussion of bonding aging standards and test methods. He first introduced the definition of aging and the aging factors that affect joints, then analyzed the reasons for conducting accelerated aging tests and various standards and methods of accelerated aging tests, and finally discussed how to accelerate aging.

The technical service expert of Bostik (Shanghai) Management Co., Ltd. talked about Moson. He gave us a speech titled: Bostik's sustainable development plan in general transportation. Bostik is now used in many fields such as general transportation and automobiles. It has the characteristics of safety, environmental protection, efficiency improvement and emission reduction, and provides customers with technical services such as rubber selection. Introducing the application of adhesives such as silane modified adhesive sealant, floor leather adhesive - hot melt pressure sensitive adhesive, acrylic structural adhesive, UV curing instant adhesive and online molding sealant. Bostik is committed to becoming customers' first choice on the road to sustainable development. Innovation partner.

Shen Hefei, technical engineer of CRRC Qingdao Sifang Rolling Stock Co., Ltd., gave a speech on the full process control of supplier bonding based on the DIN6701 system. Based on the elements of each link in the bonding process, the work flow and control requirements of bonding suppliers are clarified, including structural design, planning and preparation, first article trial production, mass production, and inspection and maintenance. At the same time, the entire bonding process is controlled based on the qualification requirements and supplier qualifications.

Sun Jiajie, general manager of Jiaotong Railway Inspection and Certification (Changzhou) Co., Ltd., the report he shared with us is: Comparison of differences in rail transit fire protection standard EN45545-2 and analysis of the vehicle fire protection assessment process. Mr. Sun introduced the company’s overview and compared the differences between EN 45545-2:2013+A1:2015 and EN 45545-2:2020 fire test standards, based on EN45545-1/2/3/4/5/6/7 The vehicle fire safety assessment evaluation model starts from formulating the assessment plan, determining the design plan, and finally evaluates the construction verification stage.

Dr. Tang Juan, director of the Composite Materials R&D Center of Changzhou Xinchuang Intelligent Technology Co., Ltd. and majoring in materials engineering, gave us a speech titled: Rail Transit Connection Structure Design and Verification Analysis. ⊥Verification of the connection performance of profile bars, small ring beams and skins, and analysis of the factors that influence structural bending performance and process forming on structural performance. In the verification of the connection performance of the side wall and roof, the test details of various tests are introduced. Since the car body is affected by shear force, the test tooling needs to be optimized to obtain ideal test results.

  Zhao Yafeng, professor-level senior engineer of Datong Electric Locomotive Co., Ltd., and Zhao Gong’s speech topic was: Research on the application technology of composite materials in the structural design of locomotive cabs. Zhao Gong has been engaged in the design of components such as locomotive cab interiors for many years. The case shared with you this time is that the inside and outside of the wall are mixed with carbon fiber and glass fiber (each layer has a different angle), the middle is filled with foam composite to form a sandwich sandwich, and a partially embedded metal frame forms the main structure. The steel structure of the driver's cab and the exterior The air deflector is integrated. The cab composite structure design is carried out through load and structural analysis, structural pre-design, sample production, parameter acquisition, finite element analysis and other methods. Verify the process plan by making a 3:1 scale model of the cab. Zhao Gong introduced the project design verification process and results in detail.

 The title of Dr. Xu, a senior training lecturer at Yifa and auditor of DIN6701 and DIN2304, is: Analysis of bonding failure in electronic products. Dr. Xu has more than 20 years of experience in adhesive development in the electronics industry. He has extensive experience in the application of bonding in various industries from consulting, Conduct research from different perspectives such as certification audits. Dr. Xu’s lecture covered the bonding principles of various adhesives in the electronics industry, the properties of commonly used adhesives in the assembly of electronic parts, and construction precautions. Common failure modes and causes are analyzed using actual cases to analyze bonding failures. The guests present were very interested in many of his cases and had lively exchanges at the meeting.

BSH Electric (Jiangsu) Co., Ltd., BSH Electric Refrigerator R&D Center Materials Science Group, Senior Materials Engineer Yu Fei and Yu Gong gave a speech titled: Introduction to Refrigerator Glass Door Bonding. Refrigerator glass door bonding is divided into framed glass door and frameless glass door. The structural design, bonding joint design, pre-bonding preparation, double-sided tape bonding introduction, hot melt adhesive bonding introduction, etc. are explained respectively. The bonding structure design is combined with the quality management requirements of DIN 2304 bonding process, taking into account the stress conditions and environmental factors. The glass door bonding is defined as S1 high-level safety requirements, requiring the actual stress of the bonding joint to be < the stress limit.

Wei Peixin, senior engineer of CRRC Nanjing Puzhen Rolling Stock Co., Ltd., shared the topic: Research on the application of non-destructive testing technology of adhesives. Non-destructive testing is the application of a variety of physical principles and chemical phenomena, mainly including radiation, ultrasonic, infrared, electromagnetic and other principle technologies, combined with instruments to detect defects in materials, parts and equipment without damaging or affecting the performance of the object being tested. , chemical and physical parameter detection technology, and then evaluate its integrity, continuity, safety, reliability and certain physical properties. The bonding quality is affected by many factors in the actual production process, including: operating environment, quality control of the bonded surface and primer, glue application process, and the operator's technical level and responsibility, etc., which may cause glue shortage and sticking in the bonded joints. Defects such as junction surface contamination, incomplete curing and partial bonding can be effectively inspected through non-destructive testing methods.

Gao Mingju, senior lecturer at Yifa Bonding & Composites Research Institute, gave a speech on the application of thermal analysis methods in the use of adhesives. Gao Gong first introduced thermal analysis technology and its advantages and disadvantages, and elaborated on the principles, usage methods and test parameters of the four methods: differential scanning calorimetry, thermogravimetric analysis, thermomechanical analysis and dynamic thermomechanical analysis. and specific application methods.

During the entire conference, experts from different industries and fields shared their technical experience in bonding and composite materials. The exchanges were lively and there were frequent interactions on and off the stage. It was truly a great collision of thinking and a great update of knowledge, which truly reflected the The platform communication function of "Bonding Day".

Around the venue, 3M brought their new generation VHB tape and new generation structural adhesive products. The scene was crowded. Technical experts exchanged opinions on some problems encountered in actual production, and some new products were quickly recognized.

Time flies, and the two-day compact "Bonding Day" conference slowly came to an end with the closing report of General Manager Zhang Yuxian. Everyone took a group photo in front of the podium on Bonding Day, and we hope to see you in Nanjing next year!

(over)