Performance index and development history of neutr

2022-07-22
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Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for bonding of structural parts. Next, lejun chemical Xiaohong will briefly describe the development history and performance indicators of structural adhesives

for neutral structural adhesive, I believe you are no stranger. This figure can be seen everywhere in building decoration. As a single component adhesive with medium and high modulus and high bonding performance, it is widely used. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for bonding of structural parts. Next, lejun chemical Xiaohong will briefly describe the development history and performance indicators of structural adhesives

1. Development history of neutral structural adhesive:

1978: French Marga came to China with structural adhesive (sikaduer 31# adhesive)

In 1980, the Ministry of construction officially issued the subject of "development and application technology promotion of building structural adhesives", which was jointly tackled by the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences and the Liaoning Institute of Building Sciences. In 1983, the subject was completed, and the first practical type of JGN building structural adhesive in China was developed, which created a precedent for chemical reinforcement in China and filled the blank of steel bonding reinforcement of domestic buildings

1990: the standard of China Engineering Construction Standardization Association "technical code for reinforcement of concrete structures" (cecs25:90) formally incorporated the steel bonding reinforcement technology into the specification and listed JGN series building structural adhesives as the designated products. Department of chemistry, Chinese Academy of Sciences Issued by the science and Technology Bureau of the Ministry of urban and rural environmental protection <& lt; Building structural adhesive and its application technology >& gt; Notice of the appraisal certificate,

1996: the Chinese Academy of Sciences developed successively according to the requirements of market development: building structural adhesive for dynamic load components, building structural adhesive for wet environment, building structural adhesive for concrete surface repair, building structural adhesive for high temperature conditions, pouring building structural adhesive and other structural reinforcement adhesives.

1997: after application research and a large number of practice, Chemical steel bonding reinforcement method has become a leading trend in the field of reinforcement technology, with sophisticated technology and easy construction Reliable technology Low labor, material and time costs Saving space and other advantages have been increasingly recognized by the majority of structural designers

2000: structural glue has rapidly developed to the concrete planting and anchoring of new and old buildings Chemical bonding of steel Chemical anchor bolt reinforcement Stick carbon fiber cloth (board) In the reinforcement and reinforcement projects such as material abrasion resistance, crack grouting, corrosion prevention and waterproof, it has become an indispensable and important building reinforcement and reinforcement material in the building industry in the future.

neutral structural adhesive has been continuously innovated and reformed since its development, and many specifications have been developed, such as sealant, waterproof and mildew proof adhesive, glass adhesive, weatherproof adhesive, building adhesive, curtain wall adhesive, fish tank adhesive, etc., but due to different formulas, the overall is uneven. I believe that in the near future, It will develop more high-performance and multi-purpose glass adhesives

2. Performance index of neutral structural adhesive:

sag: the lower the value, the better, indicating that the colloid has good deformation resistance and sagging resistance. Extrudability: a low value is better, indicating that the colloid is easy to extrude and apply

applicable period: it is better if the value is appropriate. If it is too small, the operation time is short and tense; If it is too large, the curing time will be extended, which will affect the construction period and work efficiency

surface drying time: Generally speaking, a low value is better, which means that the colloid can be solidified and formed quickly, but when the colloid surface needs to be repaired, too fast surface drying will bring disadvantages

hardness: it is better if the value is appropriate

thermal aging: the lighter the phenomenon and degree of cracking and chalking, the better

tensile adhesion: it is an important index reflecting the comprehensive properties of colloid. It gives clear test results for the tensile strength, bonding strength and fastness of colloid and the elastic modulus of colloid, providing quantitative basis for the design of curtain wall engineering. Generally speaking, the tensile bond strength of a good curtain wall structural adhesive is 0.8-1.2mpa (not less than 0.6MPa according to the national standard), and the elongation at the maximum tensile strength is more than 200% (not less than 100% according to the national standard)

since both uncured structural adhesive and structural adhesive will release volatile compounds during curing, long-term inhalation of high concentrations of volatile compounds will be harmful to health. Therefore, special attention should be paid to maintaining good ventilation in the workplace. Avoid contact with eyes before curing this product. In case of contact with eyes, rinse immediately with plenty of water, and then seek medical advice immediately. For more highlights, welcome to visit ttp://www.hklj.com.cn : Zhongshan lejun chemical, mobile: 133-9292-7276

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