News Details
Resins use latent paint crosslinking agent
2017-7-29 11:37:46
Resins use latent paint crosslinking agent chemical inert under normal conditions and cross-linking agents acting at certain temperatures. Such as BL - formaldehyde given agent, isocyanate, Lewis acid, phosphate, poly vinyl acetate emulsion and tartaric acid, oxalic acid, citric acid and organic acid salt, etc., but the effect is not very ideal, so the current domestic rarely resin by using coupling agent latent sexual intercourse.
The crosslinking process of low F/U ratio UF resin, especially the crosslinking process of low F/U matching UF resin in strong acid conditions.
, studies have shown that the under the condition of strong acid condensation of UF resin - Cs1.3 [n (F)/n (U) = 1.3], when adding crosslinking agent ammonium chloride, pH decline rate is far more than the usual synthesis of synthetic resin UF - A1.3 [n (F)/n (U) = 1.3] with UF - A1.1 [n (F)/n (U) = 1.1] much more slowly, under the condition of normal temperature gelation rate is very slow.
In water can't send out the ampoule by 110 ℃ crosslinking, and under the condition of moisture can send out the hot-pressing crosslinking, UF - the amount of solvent (DMSO) insolubles Cs1.3 formation rate is slower.
UF - A1.3 and UF - A1.1 insolubles content in crosslinking 3 min, that is more than 90% (the ampule) or more than 98% (hot-pressing conditions), and UF - Cs1.3 respectively is only 16% (in ampule) or 25% (hot-pressing conditions).
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
The crosslinking process of low F/U ratio UF resin, especially the crosslinking process of low F/U matching UF resin in strong acid conditions.
, studies have shown that the under the condition of strong acid condensation of UF resin - Cs1.3 [n (F)/n (U) = 1.3], when adding crosslinking agent ammonium chloride, pH decline rate is far more than the usual synthesis of synthetic resin UF - A1.3 [n (F)/n (U) = 1.3] with UF - A1.1 [n (F)/n (U) = 1.1] much more slowly, under the condition of normal temperature gelation rate is very slow.
In water can't send out the ampoule by 110 ℃ crosslinking, and under the condition of moisture can send out the hot-pressing crosslinking, UF - the amount of solvent (DMSO) insolubles Cs1.3 formation rate is slower.
UF - A1.3 and UF - A1.1 insolubles content in crosslinking 3 min, that is more than 90% (the ampule) or more than 98% (hot-pressing conditions), and UF - Cs1.3 respectively is only 16% (in ampule) or 25% (hot-pressing conditions).
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
After the extension of the crosslinking time, UF - Cs1.3 insolubility increased, but only 28 % (in ampoules) or 50% (under thermal pressure) in the crosslinking 20min.
Under the condition of the hot pressing when the crosslinking temperature, the formation of insoluble substance rate faster, at 180 ℃, 2 min insolubles content reached 51%, but the crosslinking time continue to extend insolubles content declined.
According to the 13 c NMR of UF - Cs1.3 crosslinking content of DMSO soluble content combined with formaldehyde to form of analysis that a urea methylene key residues is about 0.9, and the highest levels, 2 methylene ether bond less than 0.2, methoxy hydroxymethyl is 0.1 ~ 0.2, and hydroxymethyl almost does not exist, and no matter the crosslinking time length, content of soluble in DMSO combined with formaldehyde to form almost no change.
The reaction of this DMSO soluble substance is very weak. From strongly acidic conditions, on the other hand, the synthesis of low F/U matching the tensile strength of the resin impregnated paper Angle to observe the crosslinking content features, usually with the method of synthesis of low F/U ratio of UF resin.
Acid under the conditions of synthesis of UF - Cs1.3 crosslinking content in its dry state of tensile strength with usually synthesis method in the synthesis of UF - A1.3 and UF - A1.1 tensile strength, but its wet strength significantly below UF - A1.3 and UF - A1.1. The reason for the low wet strength of UF resin impregnated paper under strong acid condition is that the resin cannot be completely cross-linked, and the resin impregnated paper contains a large amount of incomplete crosslinking.
When the crosslinking temperature up to 45 ℃, the crosslinking time of 3 min, UF - Cs1.3 resin impregnated paper tensile strength greatly improved, but when the crosslinking temperature is 180 ℃, the tensile strength of the resin impregnated paper dropped [2, 5-6, 8]. The tensile strength of the impregnated paper decreases with the increase of crosslinking temperature, which can be seen as the aging phenomenon caused by heating.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
After the extension of the crosslinking time, UF - Cs1.3 insolubility increased, but only 28 % (in ampoules) or 50% (under thermal pressure) in the crosslinking 20min.
Under the condition of the hot pressing when the crosslinking temperature, the formation of insoluble substance rate faster, at 180 ℃, 2 min insolubles content reached 51%, but the crosslinking time continue to extend insolubles content declined.
According to the 13 c NMR of UF - Cs1.3 crosslinking content of DMSO soluble content combined with formaldehyde to form of analysis that a urea methylene key residues is about 0.9, and the highest levels, 2 methylene ether bond less than 0.2, methoxy hydroxymethyl is 0.1 ~ 0.2, and hydroxymethyl almost does not exist, and no matter the crosslinking time length, content of soluble in DMSO combined with formaldehyde to form almost no change.
The reaction of this DMSO soluble substance is very weak. From strongly acidic conditions, on the other hand, the synthesis of low F/U matching the tensile strength of the resin impregnated paper Angle to observe the crosslinking content features, usually with the method of synthesis of low F/U ratio of UF resin.
Acid under the conditions of synthesis of UF - Cs1.3 crosslinking content in its dry state of tensile strength with usually synthesis method in the synthesis of UF - A1.3 and UF - A1.1 tensile strength, but its wet strength significantly below UF - A1.3 and UF - A1.1. The reason for the low wet strength of UF resin impregnated paper under strong acid condition is that the resin cannot be completely cross-linked, and the resin impregnated paper contains a large amount of incomplete crosslinking.
When the crosslinking temperature up to 45 ℃, the crosslinking time of 3 min, UF - Cs1.3 resin impregnated paper tensile strength greatly improved, but when the crosslinking temperature is 180 ℃, the tensile strength of the resin impregnated paper dropped [2, 5-6, 8]. The tensile strength of the impregnated paper decreases with the increase of crosslinking temperature, which can be seen as the aging phenomenon caused by heating.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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