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Acrylic polyurethane coating with elastic crosslinking agent
2017-8-13 19:23:44
Acrylic polyurethane coating with elastic crosslinking agent
Diethyltoluenediamine Uses:
Introduces a kind of acrylic polyurethane coating with elastic preparation of crosslinking agent, the acrylic polyurethane coating prepared with elastic crosslinking agent of acrylic polyurethane coating with strong adhesion, weather resistance and elasticity, and can resist a slight crack on the surface of the concrete.
The effects of different polyether polyols, different fatty isocyanates and different NCO content of acrylic polyurethane coatings on the properties of coatings were discussed.
The traditional rigid coating, acrylic polyurethane coatings for apply to the protective coating on the surface of the metal, and when used in the concrete surface, appear more hardness and toughness, easy to produce micro cracks and make the protection effect is greatly reduced, leading to repair and maintenance cost increase; In order to reach the construction thickness of 1 mm, the construction thickness must be used in multi-way construction. Once the construction is too thick, it will crack, and the construction cycle is long and inefficient.
Was developed in this paper, a kind of acrylic polyurethane coating with elastic crosslinking agent, based on the elastic acrylic polyurethane coating with strong adhesion, weather resistance, flexibility, can be slightly on the surface of the concrete crack resistance, and high solid content, the solvent used for green solvent, can achieve the required thickness of a construction, construction efficiency is high.
Main raw materials of the experiment: polyether polyol GE - 210, GE - 220, GMN - 3050, gep-330n: industrial grade; Polyhydrofuran polyol PTMG1000, PTMG2000: industrial grade; The fatty isocyanate HDI (h6), HMDI (4, 4 '-dicyclohexyl methane diisocyanate), IPDI (isoforerone diisocyanate) : industrial grade; Fatty group crosslinking agent N75, N3390: industrial grade; Hydroxy acrylic resin: industrial grade; Catalyst t-12: industrial grade; Packing, auxiliaries, solvents, etc.
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.
Elastic the preparation of the crosslinking agent, adding a certain amount of polyether polyols into four flask, heating to 120 ~ 130 ℃, open the vacuum pump, in 0.05 ~ 0.01 MPa under vacuum dehydration 3 h; Close vacuum pump after dehydration, cooled to 60 ℃, join weighing good aliphatic isocyanate and solvent, mixing, slow heating to 75 ~ 85 ℃, the temperature response of 2.5 h; Add the catalyst to reaction 1 h, sampling, with n-butyl amine titration test, the content of NCO group, after the desired results, cooled to 40 ℃, discharging.
Coating preparation: mix resin component and the crosslinking agent composition evenly pour into a spray paint cans, adjust good gun pressure and flow rate, the spray coating evenly on the coated silica isolation membrane, guarantee the dry film thickness is 400 ~ 800 microns, standard conditions (temperature of 23 ℃, relative humidity (50 + 10) %] curing 7 d after sample testing.
Determination of tensile properties: specimen shape according to GB/T 528-528 "vulcanized rubber and thermoplastic rubber tensile stress and strain measurement of performance of Ⅰ dumbbell system, determination of tensile properties using 4104 type electronic tensile machine, sensor adopts 200 N range, the tensile rate of 250 mm/min.
Selection of polyether polyols GEP - 330 n and aliphatic isocyanate HDI respectively, IPDI, HMDI synthesis different - NCO content of crosslinking agent, then mixed with paint components preparation of coating respectively, test the tensile strength and elongation at break of film.
Applicability of organic crosslinking agent gel. Organic phenolic kind of crosslinking agent system is the basic component of formaldehyde and phenol, formaldehyde and the first water and polyacrylamide amide groups generated two alcohol alcohol and amine, the latter in and phenol generated mainly by ether bond crosslinking compounds, and the reaction can be achieved at high temperatures.
Phenol in the introduction of benzene ring, the increase of crosslinking system after "molecular weight", also improved molecular thread size, greatly enhance the thermal stability of the gel, therefore, this kind of crosslinking agent can well applied in high-temperature reservoir of deep profile control.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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