News Details
Waterborne coatings used crosslinking agent
2017-6-30 15:58:37
Waterborne coatings used crosslinking agent
How can water-borne PUD systems improve alcohol-tolerance? This kind of problem is about the single group of PUD (water-based polyurethane dispersion) on different base materials. How to improve the anti-alcohol performance of the film is recommended.
1, the first comparison of different water PUD products, choose to meet the performance requirements and alcohol resistance is relatively good, and this, of course, can not meet the requirements completely, but on the basis of this improvement will be more effective.
2. The water borne PUD has a large gap due to the presence of a small number of hydroxyl groups in the water-based PUD and the large number of carboxyl groups that are designed to be waterborne, and the molecular weight is not large enough. For these reasons, so let's join to crosslinking of small amounts of hydroxyl components, for example - NCO, or closed - NCO, one can remove hydroxyl, 2 also can improve the molecular weight, thereby improving alcohol resistance.
3, add to the composition of crosslinked carboxyl, bicomponent if you can make it, you can join n propyl organism such as crosslinking agent, if you must one-component, can use water-based multi-function additives T100 (anti-settling/crosslinking/improve the resistance to water alcohol).
4, cold dish some alcohol resistance especially excellent water-based resin, such as E - 2 a, water-borne special resin for dry film, as long as the E - 2 a solid 3% of the dry film, can be very obvious improvement alcohol resistance of paint film.
The above methods are used together, and it is very helpful to solve such problems.
Appendix 1: product information of T100
Liquid, water - based system excellent thixotropic, anti - sinking and anti-flow, improve the water - resistant and salt - resistant fog
Water-based paint anti-settling, commonly used have the following kinds: 1, bentonite, namely lithium magnesium silicate aluminum and magnesium silicate, etc., 2, pu class association, 3, polyurea structure such as a type of BYK, 4, water-based class with polyamide wax
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
In addition to the water-based polyamide wax slurry, the water resistance of the paint film will affect the overall water resistance of the film. The water resistance can not affect the salt spray performance. I recommend you another kind of water-based anti-settling multifunctional additives T100, some special its anti-settling mechanism, it exists in the molecular structure of some special groups, with hydrophilic groups such as - COOH / - OH / - NH some similar hydrogen bond coupling effect, producing a three-dimensional structure, have anti-settling sag resistance effect, because of its with hydrophilic groups such as - COOH / - OH/NH unit conducted a similar hydrogen bond coupling effect, so the film has a lot to improve water resistance, thus improving salt fog resistance.
Structure for HOOC - C - C - C -... - C - C - COOH ammonium hydrolysis, molecular weight around 10,000. Water - based system can be used to improve the properties of alcohol-resistance, water - resistant and salt - resistant properties. It can resist all kinds of acids, not alkali, can be soaked by a thermo-base, water is washed away. Excellent adhesion to metal/glass and excellent water resistance.
Coating base polyurethane crosslinking agent. Cyclopentane diisocyanate (PDI) is a new type of isocyanate with 70% carbon content. PDI derivatives for coatings and adhesives.
Compared with the existing two-component polyurethane coating, the paint treatment rate of this material is 30% faster. In the medium term, it is likely to apply to mixed plastics, composite materials and metal undercoating.
We must pay attention to the amount of crosslinking agent, such as molecular weight polymer glycol in 2000 and 400, respectively, their response equivalent of 1000 and 200, when requirements as crosslinking agent and their equivalent reaction, the dosage should be 1:5. The effects of crosslinking agents on various properties, such as mechanical properties and storage stability, are also needed to be considered when considering formulations.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
How can water-borne PUD systems improve alcohol-tolerance? This kind of problem is about the single group of PUD (water-based polyurethane dispersion) on different base materials. How to improve the anti-alcohol performance of the film is recommended.
1, the first comparison of different water PUD products, choose to meet the performance requirements and alcohol resistance is relatively good, and this, of course, can not meet the requirements completely, but on the basis of this improvement will be more effective.
2. The water borne PUD has a large gap due to the presence of a small number of hydroxyl groups in the water-based PUD and the large number of carboxyl groups that are designed to be waterborne, and the molecular weight is not large enough. For these reasons, so let's join to crosslinking of small amounts of hydroxyl components, for example - NCO, or closed - NCO, one can remove hydroxyl, 2 also can improve the molecular weight, thereby improving alcohol resistance.
3, add to the composition of crosslinked carboxyl, bicomponent if you can make it, you can join n propyl organism such as crosslinking agent, if you must one-component, can use water-based multi-function additives T100 (anti-settling/crosslinking/improve the resistance to water alcohol).
4, cold dish some alcohol resistance especially excellent water-based resin, such as E - 2 a, water-borne special resin for dry film, as long as the E - 2 a solid 3% of the dry film, can be very obvious improvement alcohol resistance of paint film.
The above methods are used together, and it is very helpful to solve such problems.
Appendix 1: product information of T100
Liquid, water - based system excellent thixotropic, anti - sinking and anti-flow, improve the water - resistant and salt - resistant fog
Water-based paint anti-settling, commonly used have the following kinds: 1, bentonite, namely lithium magnesium silicate aluminum and magnesium silicate, etc., 2, pu class association, 3, polyurea structure such as a type of BYK, 4, water-based class with polyamide wax
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
In addition to the water-based polyamide wax slurry, the water resistance of the paint film will affect the overall water resistance of the film. The water resistance can not affect the salt spray performance. I recommend you another kind of water-based anti-settling multifunctional additives T100, some special its anti-settling mechanism, it exists in the molecular structure of some special groups, with hydrophilic groups such as - COOH / - OH / - NH some similar hydrogen bond coupling effect, producing a three-dimensional structure, have anti-settling sag resistance effect, because of its with hydrophilic groups such as - COOH / - OH/NH unit conducted a similar hydrogen bond coupling effect, so the film has a lot to improve water resistance, thus improving salt fog resistance.
Structure for HOOC - C - C - C -... - C - C - COOH ammonium hydrolysis, molecular weight around 10,000. Water - based system can be used to improve the properties of alcohol-resistance, water - resistant and salt - resistant properties. It can resist all kinds of acids, not alkali, can be soaked by a thermo-base, water is washed away. Excellent adhesion to metal/glass and excellent water resistance.
Coating base polyurethane crosslinking agent. Cyclopentane diisocyanate (PDI) is a new type of isocyanate with 70% carbon content. PDI derivatives for coatings and adhesives.
Compared with the existing two-component polyurethane coating, the paint treatment rate of this material is 30% faster. In the medium term, it is likely to apply to mixed plastics, composite materials and metal undercoating.
We must pay attention to the amount of crosslinking agent, such as molecular weight polymer glycol in 2000 and 400, respectively, their response equivalent of 1000 and 200, when requirements as crosslinking agent and their equivalent reaction, the dosage should be 1:5. The effects of crosslinking agents on various properties, such as mechanical properties and storage stability, are also needed to be considered when considering formulations.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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