News Details
Low viscosity phenolic modified amine coating crosslinking agent
2017-7-7 23:44:43
Low viscosity phenolic modified amine coating crosslinking agent
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
By using non-isothermal DSC method, the crosslinking reaction process parameters of homemade low-viscosity phenol-formaldehyde modified amine crosslinking agent and epoxy resin were derived and verified by the crosslinking degree of the test system.
Had been used to characterize the crosslinking content by infrared spectrum, and determination of casting body mechanics performance, thermal performance (TG), and through the scanning electron microscope (SEM) to observe the tensile fracture surface morphology.
Results show that the E - 51 epoxy resin with homemade low viscosity phenolic modified amine crosslinking agent of mass ratio of 100:35, crosslinking process conditions for 24 h + 80 ℃ temperature / / 2 h, the system gets the best performance, the tensile strength of 55.2 MPa, the bending strength 92.8 MPa, compression strength of 83.0 MPa, the elongation at break 2.2%, Tg is 280.3 ℃. The low-viscosity phenolic resin has low viscosity, good heat resistance and good flexibility, which can be used in construction glue.
Phenolic aldehyde amine is refers to the amine and phenol and aldehyde manny phase reaction product, due to the molecular structure of the reaction product contains phenol hydroxyl, amino (NH2), secondary amine (- NH -), makes the crosslinking agent have crosslinking speed, can be in low temperature, damp, or the characteristics of the underwater crosslinking. Depending on the type of amines, phenols, aldehydes, the reactants are different, the process routes are different, the reaction conditions are different,
Different reaction endpoint control can be used to make a series of different modified amine crosslinking agents, which can show different performance characteristics after cross-linking with epoxy resin.
Now in the market of epoxy resin structural adhesive, commercially available T - 31 crosslinking agent is the phenol, formaldehyde, generally low molecular amine ethylenediamine made by simple one-step reaction, because of higher activity was extensive use, the price is relatively low. But as the "construction quality acceptance of building structure reinforcement engineering (GB50550-2010), the crosslinking agent of epoxy resin with crosslinked product high brittleness and poor toughness, comprehensive performance, difficult to meet the new requirements.
Chinese name: Diethyl toluene diamine(DETDA)Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
To this end, we use cresol, acetaldehyde and divinyl three amine a low molecular polymer was synthesized via Raman nice phenolic modified amine epoxy crosslinking agent, the crosslinking agent with low viscosity, moderate crosslinking speed, good heat resistance and mechanical properties of crosslinking and crosslinking agent of high cost performance advantages. Due to the introduction of some inactive functional groups in the homemade epoxy-crosslinking agent, the crosslinking system has shown a good toughness, which can be used as a structural glue.
Raw materials and instruments. Bisphenol A epoxy resin e-51; Homemade phenolic epoxy crosslinking agent; T-31 crosslinking agent, market. CMT4303 universal experimental machine; NicoletiS10 infrared spectrometer; SDT2960 differential thermal analyzer; 3400 - type Ⅰ scanning electron microscopy (sem).
Sample preparation. E - 51 epoxy resin and crosslinking agent, respectively, by 100, 30, 100, 35, 100, 40 (mass ratio) after mixing, making mold, according to the requirements of GB/T2567-2008 room temperature 24 h after crosslinking, and will die in the constant temperature box, according to the set temperature and time of crosslinking, demoulding after natural cooling, under test.
Cross-linking degree determination. Epoxy resin and evenly mixed crosslinking agent according to certain proportion, and 24 h at room temperature crosslinking, again according to set the temperature in the incubator and crosslinking time, take out the sample after crushing wrapped in slow quantitative filter paper weighing respectively, and then put in soxhlet extractor, using acetone circumfluence extraction after 2 h, after drying to constant quality weighing, press type calculation crosslinking degree:
The cross-linking degree = (m3 - m1)/(m2-m1) x 100% : m1 - filter paper quality, g; The total mass of the filter paper and sample before extraction of m2 - acetone, g; The total mass of the filter paper and sample after m3-acetone extraction, g. 1.3.2 determination of tensile strength of mechanical properties according to GB/T6329-1996; The bending strength and compression strength were determined according to GB/T2567-2008 resin casting performance test method.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian