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Waterborne polyurethane modified epoxy resin paint crosslinking agent
2017-7-16 17:20:55
Waterborne polyurethane modified epoxy resin paint crosslinking agent
The surface active agent was grafted to the main body of polyurethane modified epoxy resin. The preparation of water-based polyurethane modified epoxy resin crosslinking agent was prepared. The effects of TDI dosage on the performance of crosslinking agent and coating properties were discussed.
Water-based epoxy resin has many advantages, which can be widely applied in coatings, adhesives and composite materials. But this kind of resin at home is not a large number of applications, one of the important reason is that the compatibility of the crosslinking agent still has limitations, such as the crosslinking agent for coating preparation of waterborne epoxy coatings, shelf life is short, the price is too high, these factors directly restricted the widespread application of waterborne epoxy coatings.
Waterborne polyurethane modified epoxy crosslinking agent, through to the modification of epoxy resin, polyurethane and at the same time will be reactive surfactant grafted to the crosslinking agent on the resin main body, is to eliminate the influence of adding surfactants on the coating performance, and toughening to improve the performance of epoxy resin coating. The water-based epoxy crosslinking agent with self-emulsifying properties is prepared with the addition of polyamine, and its prepared floor coating has excellent comprehensive performance and low cost.
Water - based polyurethane modified epoxy resin crosslinking agent experiment. Raw materials: 2, 4 - toluene diisocyanate (2, 4-tdi), industrial grade; E-44 epoxy resin, industrial grade; Epoxy resin, industrial grade; Ethylene glycol monobutyl ether, industrial grade; Surface active agent, modified treatment; Butyl glycidyl ether, industrial grade; Acetic acid, industrial grade; Acetone, analytical; Triethylene tetramine, reagent grade; Inhibitor; The catalyst.
Preparation process. In three 500 ml flask into epoxy resin, TDI, modification, surface active agent, inhibitor, heating stirring reaction to finish (reactants soluble in acetone, drip into the saturated aqueous sodium nitrite were the same yellow).
In the 1000mL of four neck bottles, three ethylene glycosamines are involved in the reaction, and the reaction temperature is slowly added to the reactant. The addition of dibutyl glycidyl ether was used to seal the addition and the hydrophilic balance was adjusted by acetic acid.
Add distilled water and dilute to 50% solid content. 1.3 product technical index color: light yellow microemulsion; Solid points (50 + 2) %; Sticky degree (25 ℃) : 1000 ~ 2000 mpa? S; Active hydrogen equivalent: 340 plus or minus 10. 1.4 2 coating ingredient E - 44 epoxy resin (quality, similarly hereinafter), homemade water crosslinking agent in 3, add fillers and additives, the high speed dispersion, mixture water-based epoxy self-leveling floor coatings.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Effects of TDI dosage on the properties of waterborne epoxy crosslinking agent. Different TDI content (according to total quality) of water - based epoxy crosslinking agent was synthesized.
The quality score of TDI was 410% ~ 910%, and the synthetic water-based crosslinking agent had good stability, and the coating performance and coating performance were better. When less than 310%, the content of surfactant is too small to emulsify epoxy resin, which can not form stable paint solution and smooth coating. When greater than 1010%, the content of small molecule amine addition increases, although emulsifying property is good, but the system polarity increases, the surface tension is too big, also cannot form continuous coating film.
The influence of TDI dosage on the mechanical properties of coating. TDI dosage (quality score) is 410%, 518%, 810%, 910% crosslinking agent and e-44 epoxy resin.
TDI is 410% ~ 410%, the coating has good physical and mechanical properties, dosage of TDI after more than 810%, content of small molecules amine adduct multiplied, led to the decrease of the strength of coating, physical and mechanical properties.
The quality score of TDI is 510% of cross-linking agent and e-44 epoxy resin. After 215h, the paint solution is made. After the 4h and 6h are placed, the plates are made separately and 72h at room temperature.
Home-made waterborne epoxy crosslinking agent of coating, room temperature placed 4 h after preparation of the coating, performance does not drop, description of homemade water crosslinking agent gives longer lifespan waterborne epoxy coatings, the applicable period up to 4 h, can meet the needs of the engineering construction.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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