News Details
Waterborne polyurethane coating with crosslinking agent
2017-4-7 10:51:40
Waterborne polyurethane coating with crosslinking agent,Waterborne polyurethane paint is water-based polyurethane resin as basic material and water as dispersion medium type of coating. Through crosslinking modification of waterborne polyurethane coating has good storage stability, film mechanical properties, water resistance, solvent resistance and aging resistance, and close to the performance of the conventional solvent-based polyurethane coating.
Polyurethane crosslinker, which is an important development direction of waterborne polyurethane coatings. Type varieties mainly include thermosetting polyurethane coatings and water-borne polyurethane coatings containing different closed and so on several varieties.
Thermosetting type polyurethane coating. The crosslinking polyurethane can increase its solvent resistance and hydrolytic stability. Polyurethane water medium in the application of mixed with a small amount and crosslinking agent system called thermosetting type water-borne polyurethane coatings, also called a foreign league waterborne polyurethane coatings. Crosslinking agent used mainly has many functional groups of n propyl organism, or special epoxy resin such as amino resin). Using n propyl organism, general dosage for the pu quality of 3% - 3%, good crosslinking film generated;
According to the material and structure can be divided into polyurethane emulsion, vinyl polyurethane emulsion, ester emulsion, enclosed the emulsion. Polyurethane emulsion refers to oligomer polyols, chain extender, two different as raw material, polyurethane crosslinker, the common method in preparation of dispersion in water emulsion formed.
Vinyl polyurethane emulsion generally refers to in the aqueous solution or vinyl resin emulsion formed by adding different emulsion, is a two-component system. Many different emulsion is containing hydrophilic radical emulsion in water, or more dispersed in organic solution formed by emulsion with emulsifier of water, and is also a two-component use namely distribution system, production of polyurethane crosslinker, applicable period is shorter.
Enclosed different emulsion is refers to the molecule contains a vision of the sealed ester group of polyurethane emulsion, is a stable system of single component. In the preparation of emulsion department introduced closed group, also can be made into a closed group of high levels of emulsion, and other blending emulsion system, and plays a role of crosslinking, heating water loss after crosslinking.
Dosage of cosolvent and choosing appropriate, not only of good quality, also can greatly reduce the cost; In coil coatings with polyester resin as base material, choose more cosolvent some esters (n-butyl acetate) and alcohols (butyl alcohol) and some ketone (butanone); As acrylic resin type plastic coating of cosolvent alcohol (butyl alcohol, isopropyl alcohol, normal propyl alcohol) and some ethanol (glycol butyl ether, propylene glycol methyl ether), also due to reasons such as toxicity, ethylene glycol butyl ether are now partially replaced by diacetone alcohol etc.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ 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).
Only by active solvent will cause the cost is too high, and as a result of "too good" dissolve resin viscosity and make the oil paint "low"; But when mixed with filling solvent, in addition to choose appropriate varieties, but also control its dosage, to ensure that the mixed solvent of solvency.
The dilution ratio - a highest number of active solvents can tolerate filling. More than this value, dissolving power will be completely lost. To formulate formula, must fully consider the construction environment temperature, the system of packing, pigments and additives on the influence of solvent dissolving power, retain excess reactive solvent in place to ensure that solvency. Temperature, dilution ratio will reduce. This is also the nitro coating in hot weather to use active solvent for one reason.
Nitro paint, for example: in the filling solvents, aromatic oil analogy of solvent dilution ratio is much higher.
Corresponding ethyl acetate: such as the dilution ratio are: toluene - 3.4; Solvent oil - 1.0.
Especially when ketone as active solvent, corresponding to the same acetone: dilution ratio respectively: toluene - 4.5; Solvent oil - 0.7.
So in nitrocellulose coatings, aromatic hydrocarbons, such as toluene or xylene as solvent filling, and rarely USES fat hydrocarbon solvent as filler. Of course, add a small amount of n-butyl alcohol can significantly increase the amount of nitrocellulose coatings with filling solvent.
Key - "formula" concept, is to maintain the actual use of the original performance effective mixed solvent formula (solvency and volatile rate) remains the same, with the market price is low, supply abundant solvent substitute - reduce the cost.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Polyurethane crosslinker, which is an important development direction of waterborne polyurethane coatings. Type varieties mainly include thermosetting polyurethane coatings and water-borne polyurethane coatings containing different closed and so on several varieties.
Thermosetting type polyurethane coating. The crosslinking polyurethane can increase its solvent resistance and hydrolytic stability. Polyurethane water medium in the application of mixed with a small amount and crosslinking agent system called thermosetting type water-borne polyurethane coatings, also called a foreign league waterborne polyurethane coatings. Crosslinking agent used mainly has many functional groups of n propyl organism, or special epoxy resin such as amino resin). Using n propyl organism, general dosage for the pu quality of 3% - 3%, good crosslinking film generated;
According to the material and structure can be divided into polyurethane emulsion, vinyl polyurethane emulsion, ester emulsion, enclosed the emulsion. Polyurethane emulsion refers to oligomer polyols, chain extender, two different as raw material, polyurethane crosslinker, the common method in preparation of dispersion in water emulsion formed.
Vinyl polyurethane emulsion generally refers to in the aqueous solution or vinyl resin emulsion formed by adding different emulsion, is a two-component system. Many different emulsion is containing hydrophilic radical emulsion in water, or more dispersed in organic solution formed by emulsion with emulsifier of water, and is also a two-component use namely distribution system, production of polyurethane crosslinker, applicable period is shorter.
Enclosed different emulsion is refers to the molecule contains a vision of the sealed ester group of polyurethane emulsion, is a stable system of single component. In the preparation of emulsion department introduced closed group, also can be made into a closed group of high levels of emulsion, and other blending emulsion system, and plays a role of crosslinking, heating water loss after crosslinking.
Dosage of cosolvent and choosing appropriate, not only of good quality, also can greatly reduce the cost; In coil coatings with polyester resin as base material, choose more cosolvent some esters (n-butyl acetate) and alcohols (butyl alcohol) and some ketone (butanone); As acrylic resin type plastic coating of cosolvent alcohol (butyl alcohol, isopropyl alcohol, normal propyl alcohol) and some ethanol (glycol butyl ether, propylene glycol methyl ether), also due to reasons such as toxicity, ethylene glycol butyl ether are now partially replaced by diacetone alcohol etc.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ 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).
Only by active solvent will cause the cost is too high, and as a result of "too good" dissolve resin viscosity and make the oil paint "low"; But when mixed with filling solvent, in addition to choose appropriate varieties, but also control its dosage, to ensure that the mixed solvent of solvency.
The dilution ratio - a highest number of active solvents can tolerate filling. More than this value, dissolving power will be completely lost. To formulate formula, must fully consider the construction environment temperature, the system of packing, pigments and additives on the influence of solvent dissolving power, retain excess reactive solvent in place to ensure that solvency. Temperature, dilution ratio will reduce. This is also the nitro coating in hot weather to use active solvent for one reason.
Nitro paint, for example: in the filling solvents, aromatic oil analogy of solvent dilution ratio is much higher.
Corresponding ethyl acetate: such as the dilution ratio are: toluene - 3.4; Solvent oil - 1.0.
Especially when ketone as active solvent, corresponding to the same acetone: dilution ratio respectively: toluene - 4.5; Solvent oil - 0.7.
So in nitrocellulose coatings, aromatic hydrocarbons, such as toluene or xylene as solvent filling, and rarely USES fat hydrocarbon solvent as filler. Of course, add a small amount of n-butyl alcohol can significantly increase the amount of nitrocellulose coatings with filling solvent.
Key - "formula" concept, is to maintain the actual use of the original performance effective mixed solvent formula (solvency and volatile rate) remains the same, with the market price is low, supply abundant solvent substitute - reduce the cost.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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