News Details
The influence of coating of crosslinking agent on the performance
2017-3-23 10:57:00
The influence of coating of crosslinking agent on the performance,In two-component water-borne epoxy coating system, film of crosslinking is a physical and chemical reaction, crosslinking agent and in the process of evaporation of water of epoxy resin particles surface contact, chemical crosslinking reaction, and crosslinking agent molecules to epoxy resin particle internal diffusion, under the capillary pressure of latex particles and crosslinked epoxy resin to pile up, until the formation of uniform, continuous film.
Crosslinking agent will affect the degree of crosslinking and crosslinking structure of paint film, thus influence on the performance of the paint film mechanical properties and corrosion, so the dosage of crosslinking agent is crucial. In this experiment, a series of experiments to determine the dosage of crosslinking agent.
By the experimental results it can be seen as the crosslinking agent amount is less than or greater than 1:1 3-1, paint film is poor water resistance, all is due to the low crosslinking density, leading to oxygen and moisture permeability more easily.
At the same time because the amine crosslinking agent is hydrophilic, too much will lead to serious corrosion of crosslinking agent; When the proportion of crosslinking agent 2-1 to 1.5:1, epoxy groups and crosslinking agent can response, forming dense crosslinked structure, the technical specifications of the paint film meets the requirements; Therefore, this formula system of epoxy and crosslinking agent take in 2:1 ratio to 1.5:1.
Of waterborne epoxy coatings film forming process is more strict than the solvent, because the process has two steps: one is the evaporation of water. 2 it is paint film crosslinked crosslinking. If crosslinking speed is higher than the evaporation of moisture, paint film will contain moisture, crosslinking density decrease performance will be reduced.
This makes the construction, such as temperature, relative humidity and ventilation conditions control is more strict than solvent-based products. In this experiment, testing the changes of film performance under different construction conditions.
Epoxy crosslinking agent and crosslinking reaction is exothermic reaction, relative to other water-based paint, high temperature tolerance, construction under the condition of above 5 ℃ can crosslinking, at the same time as the environment temperature is higher, the paint film comprehensive performance is better; Because of waterborne epoxy coatings containing a large number of moisture, relative humidity will lead to moisture evaporation rate is too low, resulting in a decline in crosslinking density and film water resistance decreased obviously. By the experimental results it can be seen that the humidity is less than 70%, the temperature is more than 10 ℃ as the best construction conditions.
Was developed using vinyl three (beta - methoxy) ethoxy silane as a modifier of the waterborne epoxy emulsion, when the addition amount of 3% ~ 3%, significantly improved the stability of epoxy emulsion.
Acid value, stability of emulsion and film performance were studied, the influence of the final acid value (KOH) in 60-90 mg/g, emulsion stability and balance the best paint film performance.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Determine the best proportion of the epoxy emulsion and crosslinking agent, when the proportion of epoxy latex and crosslinking agent 2-1 to 1.5:1, paint film comprehensive performance is the best.
To study the influences of construction conditions on the film crosslinked, when humidity is less than 70%, the temperature is more than 10 ℃ as the best construction conditions.
So-called anticorrosive coatings is the overall design of sanitary which refers to the paint itself should be considered during development components (film-forming material, anticorrosive paint, solvents and additives), the synthesis of raw materials and coating, substrate pretreatment process of the production process, the construction process, such as the overall harmless.
For example, the raw materials used although itself is harmless, but its production process is not in conformity with the requirements of environmental protection, also want to give up, such as chlorinated rubber; Some materials, such as lead red antirust paint performance is excellent, but it is toxic, not safe in humans, easy to cause environmental pollution, and its performance is good also can't use.
In order to use anti-corrosion coatings on metal surface, must first carries on the oil removal, rust removal, such as pretreatment, and pretreatment process generally will damage to the environment, and the cost is higher, if the rusty coating, can be coated directly on the surface of the steel rust rust stability, passivation or transformation; In order to reduce the environmental pollution of pretreatment process, also appeared a pollution-free sandblasting derusting process, such as wet sand blasting technology, etc.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Crosslinking agent will affect the degree of crosslinking and crosslinking structure of paint film, thus influence on the performance of the paint film mechanical properties and corrosion, so the dosage of crosslinking agent is crucial. In this experiment, a series of experiments to determine the dosage of crosslinking agent.
By the experimental results it can be seen as the crosslinking agent amount is less than or greater than 1:1 3-1, paint film is poor water resistance, all is due to the low crosslinking density, leading to oxygen and moisture permeability more easily.
At the same time because the amine crosslinking agent is hydrophilic, too much will lead to serious corrosion of crosslinking agent; When the proportion of crosslinking agent 2-1 to 1.5:1, epoxy groups and crosslinking agent can response, forming dense crosslinked structure, the technical specifications of the paint film meets the requirements; Therefore, this formula system of epoxy and crosslinking agent take in 2:1 ratio to 1.5:1.
Of waterborne epoxy coatings film forming process is more strict than the solvent, because the process has two steps: one is the evaporation of water. 2 it is paint film crosslinked crosslinking. If crosslinking speed is higher than the evaporation of moisture, paint film will contain moisture, crosslinking density decrease performance will be reduced.
This makes the construction, such as temperature, relative humidity and ventilation conditions control is more strict than solvent-based products. In this experiment, testing the changes of film performance under different construction conditions.
Epoxy crosslinking agent and crosslinking reaction is exothermic reaction, relative to other water-based paint, high temperature tolerance, construction under the condition of above 5 ℃ can crosslinking, at the same time as the environment temperature is higher, the paint film comprehensive performance is better; Because of waterborne epoxy coatings containing a large number of moisture, relative humidity will lead to moisture evaporation rate is too low, resulting in a decline in crosslinking density and film water resistance decreased obviously. By the experimental results it can be seen that the humidity is less than 70%, the temperature is more than 10 ℃ as the best construction conditions.
Was developed using vinyl three (beta - methoxy) ethoxy silane as a modifier of the waterborne epoxy emulsion, when the addition amount of 3% ~ 3%, significantly improved the stability of epoxy emulsion.
Acid value, stability of emulsion and film performance were studied, the influence of the final acid value (KOH) in 60-90 mg/g, emulsion stability and balance the best paint film performance.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Determine the best proportion of the epoxy emulsion and crosslinking agent, when the proportion of epoxy latex and crosslinking agent 2-1 to 1.5:1, paint film comprehensive performance is the best.
To study the influences of construction conditions on the film crosslinked, when humidity is less than 70%, the temperature is more than 10 ℃ as the best construction conditions.
So-called anticorrosive coatings is the overall design of sanitary which refers to the paint itself should be considered during development components (film-forming material, anticorrosive paint, solvents and additives), the synthesis of raw materials and coating, substrate pretreatment process of the production process, the construction process, such as the overall harmless.
For example, the raw materials used although itself is harmless, but its production process is not in conformity with the requirements of environmental protection, also want to give up, such as chlorinated rubber; Some materials, such as lead red antirust paint performance is excellent, but it is toxic, not safe in humans, easy to cause environmental pollution, and its performance is good also can't use.
In order to use anti-corrosion coatings on metal surface, must first carries on the oil removal, rust removal, such as pretreatment, and pretreatment process generally will damage to the environment, and the cost is higher, if the rusty coating, can be coated directly on the surface of the steel rust rust stability, passivation or transformation; In order to reduce the environmental pollution of pretreatment process, also appeared a pollution-free sandblasting derusting process, such as wet sand blasting technology, etc.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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