News Details
Experiment with epoxy coating coating crosslinking agent
2017-5-10 15:43:31
Experiment with epoxy coating coating crosslinking agent.Common corrosive medium (including solvent, oxygen, water and salt water, etc.) for coating has strong penetration, predict the coating resistance to corrosion medium permeability and corrosion resistance of coating, the attention of designers and the paint recipe applicators.
Tests show that water molecules in contact with coating, first produced in the coating on the surface of the adsorption of water, then water diffusion to the inside coating, reach the surface of the substrate through the film, in the presence of oxygen, the following reaction: H2O + 1/2 O2 + 2 e - 2 oh -
The generated OH - reacts with the substrate metal ions to produce metal hydride (rust). The presence of salt in the atmosphere of the coastal area, and the erosion of salt through the coating, will accelerate the corrosion of the metal, and the corrosion process of the presence of water and oxygen is as follows:
Fe plus 2Cl minus 2 plus 2e
O2 + 2H2O + 4e + 4Na + -4 NaOH
4FeCI2 + 8NaOH + O2 to 2Fe2O3
The corrosion reaction is characterized by the fact that the salt (NaCl) can be regenerated during corrosion and remains deep in the corrosion layer, causing the substrate metal to continue to corrode.
70 per cent of steel is used in a rusting environment, preventing steel corrosion from being an important task for anti-corrosion coatings. Corrosion medium of the osmosis of epoxy coating, refers to the corrosive medium through reach the surface of the substrate coating and corrosion medium in coating product set or destruction of coating volatile chemical bonds.
The crosslinking density of epoxy coating, coating containing polar groups, or can be corrosive medium damage to the coating of chemical bond of medium permeability resistance, water resistance, resistant to salt water and salt fog resistance and so on.
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.
If use TY300 polyamide 44 epoxy resins and crosslinking of E - E - 20 epoxy resin (according to the amount of active materials such as epoxy group and hydrogen than design formula), as a result of E - 44 epoxy coating crosslinked density is greater than E - 20 the crosslinking density of epoxy coating, is the medium penetration capacity of E - > E - 20 44 film coating; With TY300 cross-linked epoxy resin 711 #, formation of the coating contains ester linkage and hydroxyl, water and chloride ions could prompt the ester bond damage inside the coating, the coating resistance to water and resistant to salt water is very poor; The epoxy resins of 0.49 eq / 100 g of phenolic epoxy resin and TY300 are coated with the TY300, and the coating is destroyed when the distilled water is 30 d.
Raw material and coating detection method. E-44, e-20 and e-12 epoxy, industrial products; HW28 organic silicon epoxy resin, industrial products; Liquid epoxy resins and single functional diluents, industrial products; TY300 and TY650 polyamide, industrial products; Special additives; Titanium pigment, R902; Iron oxide red, Y190; Barite powder, 800 eyes; Defoaming agent and leveling agent; Active compound with antirust paint, thixotropic resin Ⅱ, amine adduct, D - 8 H04 H06 and H09 crosslinking agent; GLP503 fluid, light yellow.
Coating method: water vapor is applied to the film. Breathable with crushed half of breathable cup capacity of water, free epoxy coating with different crosslinking density is close seal air permeability, under 40 ℃, reduction of measuring permeability cup in the inland waters, get in unit time water vapor through the amount of epoxy coating.
The coating is water resistant to boiling water. Will be painted with coating specimens soaked in water with a reflux condenser test inside the bottle, keep the bottle in the inland waters boil, temperature 98 ~ 100 ℃, to observe the coating surface in the different time change.
Film resistance. Will be painted with coating specimens soaked in 3.5% salt water with cover measuring cup, then measuring cup in 64 ~ 66 ℃ constant temperature water bath, salt water temperature and the constant temperature water bath temperature phase at the same time, began to record the test of time.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Tests show that water molecules in contact with coating, first produced in the coating on the surface of the adsorption of water, then water diffusion to the inside coating, reach the surface of the substrate through the film, in the presence of oxygen, the following reaction: H2O + 1/2 O2 + 2 e - 2 oh -
The generated OH - reacts with the substrate metal ions to produce metal hydride (rust). The presence of salt in the atmosphere of the coastal area, and the erosion of salt through the coating, will accelerate the corrosion of the metal, and the corrosion process of the presence of water and oxygen is as follows:
Fe plus 2Cl minus 2 plus 2e
O2 + 2H2O + 4e + 4Na + -4 NaOH
4FeCI2 + 8NaOH + O2 to 2Fe2O3
The corrosion reaction is characterized by the fact that the salt (NaCl) can be regenerated during corrosion and remains deep in the corrosion layer, causing the substrate metal to continue to corrode.
70 per cent of steel is used in a rusting environment, preventing steel corrosion from being an important task for anti-corrosion coatings. Corrosion medium of the osmosis of epoxy coating, refers to the corrosive medium through reach the surface of the substrate coating and corrosion medium in coating product set or destruction of coating volatile chemical bonds.
The crosslinking density of epoxy coating, coating containing polar groups, or can be corrosive medium damage to the coating of chemical bond of medium permeability resistance, water resistance, resistant to salt water and salt fog resistance and so on.
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.
If use TY300 polyamide 44 epoxy resins and crosslinking of E - E - 20 epoxy resin (according to the amount of active materials such as epoxy group and hydrogen than design formula), as a result of E - 44 epoxy coating crosslinked density is greater than E - 20 the crosslinking density of epoxy coating, is the medium penetration capacity of E - > E - 20 44 film coating; With TY300 cross-linked epoxy resin 711 #, formation of the coating contains ester linkage and hydroxyl, water and chloride ions could prompt the ester bond damage inside the coating, the coating resistance to water and resistant to salt water is very poor; The epoxy resins of 0.49 eq / 100 g of phenolic epoxy resin and TY300 are coated with the TY300, and the coating is destroyed when the distilled water is 30 d.
Raw material and coating detection method. E-44, e-20 and e-12 epoxy, industrial products; HW28 organic silicon epoxy resin, industrial products; Liquid epoxy resins and single functional diluents, industrial products; TY300 and TY650 polyamide, industrial products; Special additives; Titanium pigment, R902; Iron oxide red, Y190; Barite powder, 800 eyes; Defoaming agent and leveling agent; Active compound with antirust paint, thixotropic resin Ⅱ, amine adduct, D - 8 H04 H06 and H09 crosslinking agent; GLP503 fluid, light yellow.
Coating method: water vapor is applied to the film. Breathable with crushed half of breathable cup capacity of water, free epoxy coating with different crosslinking density is close seal air permeability, under 40 ℃, reduction of measuring permeability cup in the inland waters, get in unit time water vapor through the amount of epoxy coating.
The coating is water resistant to boiling water. Will be painted with coating specimens soaked in water with a reflux condenser test inside the bottle, keep the bottle in the inland waters boil, temperature 98 ~ 100 ℃, to observe the coating surface in the different time change.
Film resistance. Will be painted with coating specimens soaked in 3.5% salt water with cover measuring cup, then measuring cup in 64 ~ 66 ℃ constant temperature water bath, salt water temperature and the constant temperature water bath temperature phase at the same time, began to record the test of time.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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