News Details
Pigment printing crosslinking agent pan-yellow test
2017-5-18 17:49:34
Pigment printing crosslinking agent pan-yellow test
Yellowing of (1) test purposes: adhesive sex refers to the adhesive film should not have yellow discoloration phenomenon after high temperature treatment, otherwise not conducive to production control of the light, but also can make color brilliance.
(2) the printing of the printing paste: the coating printing adhesive sample 40g and the emulsion A60g, stirring and stirring, spare.
(3) printed fabric preparation: polyester walked not bleached cloth (or other) bleached fabric, printed by 1 to 2 g/L before detergent solution boiling in 20 min, take out the water wash and dry and set aside.
(4) printing method: will printing screen with a large decorative pattern on the bedplate covered by fabric in advance, will this paste on the screen to fit in with a rubber scraper scrape a back and forth, remove the printed fabric drying under 100 ℃.
(5) the yellowing test: will the above already drying printing fabric (colorless) on already baking in the oven temperature to 180 ℃ in advance 2 min, take out, wait for after cooling touch with grey color sample card for printed parts and not printed parts. Level 5 is the best. Level 1 is the worst.
yellow test also can use sublimation fastness tester, 185 ℃ during hot lmin, then.
The degree of yellowing is also used to measure the whiteness of the printed and unprinted parts, the whiteness of the whiteness is yellow. The larger the number, the worse the yellowing.
to understand the yellowing of crosslinking agent and crosslinking agent on the adhesive of the impact of yellow, can be used to add a add crosslinker (100 g this paste added crosslinking agent 2 g) of this paste printing fabric, according to the above method test and comparison.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
The printed fabric after baking, touching the printing area with the hand, you can understand the feeling of the adhesive.
In structural adhesive in the thermal aging process in the air, we use the gas detector to detect SO2 and NH3, HCN and thus confirms our chain segment of migrating to the surface by air oxidation of volatile components to be assumptions.
In other experiments, we noticed that the individual thermal degradation of the crosslinking agent DDA and DDS in the air also produced large amounts of NH3 and SO2. These phenomena not only confirm the process of degradation of nitrogen and sulfur by thermal oxidation, but also strongly indicate that these segments are indeed DDA and DDS themselves.
In the thermal decomposition stages of degradation, oxygen plays two roles, according to introduce: a. led to the formation of a surface layer (TOL) degradation, and b. will thermal oxidation of nitrogen and sulfur molecules to volatiles.
We observed that the sulfur segment on the surface of the sample was partially consumed (showing that the peak was off the surface) and that the oxygen had only a very low concentration. Thus we can infer that oxygen will give priority to the segment of the surface and not the surface oxidation layer (TOL). The surface biodegradable layer also can be observed directly by scanning electron microscopy (SEM).
The above discussion shows that nitrogen and sulfur chain segment after chain shear is under high vacuum can be volatile, but requires further thermal oxidation degradation under atmospheric pressure to become volatile. In order to gain a strong evidence to confirm us about sample chain segment is actually on the surface of the DDA and the imaginary of the DDS itself, separately studied under different gas environment of these two kinds of thermal behavior of the crosslinking agent. The first observation is that these two molecules, DDA and DDA, are indeed volatile in high vacuum.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Yellowing of (1) test purposes: adhesive sex refers to the adhesive film should not have yellow discoloration phenomenon after high temperature treatment, otherwise not conducive to production control of the light, but also can make color brilliance.
(2) the printing of the printing paste: the coating printing adhesive sample 40g and the emulsion A60g, stirring and stirring, spare.
(3) printed fabric preparation: polyester walked not bleached cloth (or other) bleached fabric, printed by 1 to 2 g/L before detergent solution boiling in 20 min, take out the water wash and dry and set aside.
(4) printing method: will printing screen with a large decorative pattern on the bedplate covered by fabric in advance, will this paste on the screen to fit in with a rubber scraper scrape a back and forth, remove the printed fabric drying under 100 ℃.
(5) the yellowing test: will the above already drying printing fabric (colorless) on already baking in the oven temperature to 180 ℃ in advance 2 min, take out, wait for after cooling touch with grey color sample card for printed parts and not printed parts. Level 5 is the best. Level 1 is the worst.
yellow test also can use sublimation fastness tester, 185 ℃ during hot lmin, then.
The degree of yellowing is also used to measure the whiteness of the printed and unprinted parts, the whiteness of the whiteness is yellow. The larger the number, the worse the yellowing.
to understand the yellowing of crosslinking agent and crosslinking agent on the adhesive of the impact of yellow, can be used to add a add crosslinker (100 g this paste added crosslinking agent 2 g) of this paste printing fabric, according to the above method test and comparison.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
The printed fabric after baking, touching the printing area with the hand, you can understand the feeling of the adhesive.
In structural adhesive in the thermal aging process in the air, we use the gas detector to detect SO2 and NH3, HCN and thus confirms our chain segment of migrating to the surface by air oxidation of volatile components to be assumptions.
In other experiments, we noticed that the individual thermal degradation of the crosslinking agent DDA and DDS in the air also produced large amounts of NH3 and SO2. These phenomena not only confirm the process of degradation of nitrogen and sulfur by thermal oxidation, but also strongly indicate that these segments are indeed DDA and DDS themselves.
In the thermal decomposition stages of degradation, oxygen plays two roles, according to introduce: a. led to the formation of a surface layer (TOL) degradation, and b. will thermal oxidation of nitrogen and sulfur molecules to volatiles.
We observed that the sulfur segment on the surface of the sample was partially consumed (showing that the peak was off the surface) and that the oxygen had only a very low concentration. Thus we can infer that oxygen will give priority to the segment of the surface and not the surface oxidation layer (TOL). The surface biodegradable layer also can be observed directly by scanning electron microscopy (SEM).
The above discussion shows that nitrogen and sulfur chain segment after chain shear is under high vacuum can be volatile, but requires further thermal oxidation degradation under atmospheric pressure to become volatile. In order to gain a strong evidence to confirm us about sample chain segment is actually on the surface of the DDA and the imaginary of the DDS itself, separately studied under different gas environment of these two kinds of thermal behavior of the crosslinking agent. The first observation is that these two molecules, DDA and DDA, are indeed volatile in high vacuum.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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