Banzan adhesive scientific team analysis, starting from the aging mechanism of adhesive resin, based on the environment of plastic -lining steel pipes, introduce the actual aging test method and instrument and equipment, which used to establish an experimental platform for testing，research and development. It can detect and evaluate the performance of thermal oxidation, ultraviolet aging, salt fog aging, high temperature salt, high -low temperature, acid -resistant, alkali, salt and water such as high -temperature salt, high temperature salt, high -temperature salt, high -temperature salt, high -temperature salt.
According to the different requirement of clients, Based on the theory and actual research on the adhesive resin aging performance. Developing the weathering- resistant bonding adhesive resin used under different environmental conditions. The product shows good results under the following aging and medium conditions:
1) Ultraviolet aging performance
The ultraviolet aging test of the adhesive resin is tested according to the method specified in Method A in GB/T 16422.3-2014. By putting the hot melt adhesive resin in the ultraviolet aging box, and then choosing the UVA-340 light source to simulate the ultraviolet parts in the sunlight, set the radiation The degree is 0.76 W.M-2.nm-1, aging 1000H, and then take out to test the peeling strength and tensile strength of bonding adhesive resin. After the ultraviolet aging test of adhesive resin, the stretch strength retention rate is more than 70% after UV aging, and the maintenance rate of the peeling strength is above 95%.
2) Salt -resistant fog aging performance
The salt fog aging test of the bonding resin is performed in accordance with the regulations of GB/T 12000, Set the experimental temperature of the adhesive in the salt spray box to 35°C, the concentration of the sodium solution is 50g/L, and the pH value is 6.5-7.2. experiment the aging for 1000h, and then take out and test the peel strength, tensile strength and elongation at break of the adhesive resin. After the adhesive resin is aged by salt spray, the retention rate of peel strength, tensile strength and elongation at break are all above 90%.
3) Thermo-oxidative aging performance
The thermal oxidative aging performance of the hot melt adhesive resin was characterized by the oxidation induction time, and the time when the adhesive resin began to undergo autocatalytic oxidation reaction at high temperature (200 ℃) and oxygen atmosphere was tested. The oxidation induction time of the adhesive resin is ≥ 20 minutes.
4) High and low temperature alternating aging resistance
High and low temperature alternating aging test of adhesive resin is to set lowest temperature to highest temperature from o-40℃ to 80℃, which set (-40±2)℃×2h, (80±2)℃×2h per cycle, cycle time is 50, and then test the adhesive resin peel strength. The retention rate of the peel strength of the adhesive resin after alternating aging at high and low temperature is more than 90%.
5) Acid, alkali and salt resistance
The adhesive resin is bonded to the steel plate, which made the specified size of sample, which is soaked in a solution of 30% H2SO4, 10% NaOH and 10% NaCl to test the acid, alkali and salt resistance of the adhesive resin. The adhesive resin showed good adhesion during the soaking process.
6) Water resistance
The demonstration of bonding the adhesive to the adhesive to achieve the specified size was not immersed in water at 23 ° C for 720 hours at all, and the adhesive did not show a similar phenomenon with the adhesive, and the adhesive force decreased on the surface. The boundary where the sample will be placed (98±2h, 12h) begins to approach the phenomenon, and the unparted part still maintains the network strength.
Effects on the stability of serif shaping applications
Through the research on the aging mechanism of the adhesive resin, it is possible to deeply understand the influencing factors and detection methods of the adhesive resin aging, which will help to take effective measures to enhance the anti-aging properties of the adhesive resin and develop a weather-resistant adhesive resin. The weather resistance research of the adhesive resin comprehensively considers the natural environment factors in the production and application of plastic-lined steel pipes, including light, heat, oxygen, moisture, and conveying media. By setting the corresponding aging test, the aging behavior of the adhesive resin in a specific environment can be understood, so that the aging degree and service life of the application of the plastic-lined steel pipe can be more accurately judged, and the corresponding long-term application stability of the plastic-lined steel pipe can be provided. Data support also provides reliable technical support for life assessment of plastic-lined steel pipes.
Conclusion
With the rapid development of the composite pipe industry, the performance requirements of the bonding resin in the production and application of plastic-lined steel pipes are getting higher and higher. By studying the aging mechanism of the bonding resin in the application of plastic-lined steel pipes, we will continuously improve its bonding to materials and application performance in different environments, and develop bonding resins with a wide range of applications and aging resistance. and provide strong support for social construction and development.