News Details
Polyolefin coating crosslinking agent
2017-5-29 14:52:35
Polyolefin coating crosslinking agent
With organic peroxide crosslinking initiator of polyolefin crosslinking agent granulation time is shorter, temperature is between 115 ~ 117 ℃, should not exceed 130 ℃ crosslinking initiator decomposition temperature, otherwise, due to the rapid crosslinking obstructed barrel damage to machinery and equipment.
Make DCP soluble in liquid paraffin oil in the uniform of LDPE extrusion machine through the metering pump, pumping volume quickly decompose and got behind the LDPE/pipes, can improve the strength of the LDPE pipes, however, the pipe can't use the method of melting heat when it is assembled to connect, brought difficult to assemble.
Extrusion tube, pipe in boiling water or greater than 50 ℃ water or water vapor in the crosslinking reaction, the silane crosslinked PE pipes, crosslinking degree can reach 72% ~ 76%, volume resistivity, up to 8 x 1016 Ω cm. Embrittlement point to - 60 ℃, can be used in conveying hot water. The group divided by b = 95/5. It can also be used to extrude the cable cables, good electrical insulation, acid, alkali, oil and organic solvents. The disadvantage is that the installation is difficult.
We can get these molecules that can't evaporate directly under these temperature and pressure conditions, but they're slowly degrading. It is also noted that the degradation of DDS at a given temperature is more rapid than the degradation of DDA. The observed cross-linking agent was very similar to the thermal aging behavior of the surface of the resin with temperature and pressure. These conclusions seem to confirm our assumptions about the chemical properties of nitrogen and sulfur molecules.
Experts confirm that oxygen has two functions at this stage, the a. Oxide polymer forms the TOL surface and the b. The surface free chain heat oxidation is the volatile component (SO2, NH3, HCN). In the aging process of low oxygen partial pressure, we observed that the free chain segment near the surface was partially depleted but the surface of the sample was obviously not oxidized. So it's inferred that under these conditions, oxygen first reacts to break down the free chain rather than the surface of the oxidation.
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
The main difference between sulfur and nitrogen peaks is their peak position. In contrast to the changes in the concentration of sulfur in the air, the peak of nitrogen does not shift away from the surface at the same time. These peaks depend on the difference between the speed of the chain segment and the rate of degradation of these segments. DDS appears to be losing weight faster than DDA. This can be inferred that the sulfur-containing segments degrade the nitrogen-containing segments faster.
This is a good explanation for why the peak of sulfur deviates from the surface. If you think that the segments of the migration are DDA and DDS themselves, then you can imagine that because of their respective sizes, the migration rate of the DDA molecule should be greater than DDS. Therefore, we believe that the above considerations determine the peak position observed.
In order to prove that the chain segment which was liberated by thermal decomposition and migrated to the surface is the crosslinking agent DDA and DDS, we studied their thermal behavior separately. We found that the cross-linking agent DDA and thermal behavior and migrate to the surface of the DDS itself free segment of the thermal behavior of similar: under the temperature higher than 150 ℃, they are under high vacuum are volatile and is not under atmospheric pressure.
In the air under atmospheric pressure, the crosslinking agent is slowly oxidized and degraded until it completely disappears. By the analysis of the weight analysis of heat degradation of the crosslinking agent, we obtained the degradation activation energy of DDS (142 + + 15) kJ/mol and DDA (140 + + 15) kJ/mol. These Numbers are very close to what the structural glue is measuring (130 plus or minus 4). Therefore, it is reasonable to think that the weightless process of structural glue is controlled by the degradation of the crosslinking agent which is transferred to the surface by the degradation of the chain.
Through the above hypothesis, to determine whether a sample that consists only of two types of crosslinking agent after aging of inert gas environment, the surface chemical composition and the properties of the surface. Under the condition of aging in the inert gas, we can predict that the surface will have a 77 percent mass fraction DDS and 23% of DDA, exactly the amount of the equivalent of one in one. All these conclusions are in support of our assumptions: in the process of thermal degradation of modification of epoxy resin, in the sample surface migration of segment is crosslinking agent DDA and DDS itself.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
With organic peroxide crosslinking initiator of polyolefin crosslinking agent granulation time is shorter, temperature is between 115 ~ 117 ℃, should not exceed 130 ℃ crosslinking initiator decomposition temperature, otherwise, due to the rapid crosslinking obstructed barrel damage to machinery and equipment.
Make DCP soluble in liquid paraffin oil in the uniform of LDPE extrusion machine through the metering pump, pumping volume quickly decompose and got behind the LDPE/pipes, can improve the strength of the LDPE pipes, however, the pipe can't use the method of melting heat when it is assembled to connect, brought difficult to assemble.
Extrusion tube, pipe in boiling water or greater than 50 ℃ water or water vapor in the crosslinking reaction, the silane crosslinked PE pipes, crosslinking degree can reach 72% ~ 76%, volume resistivity, up to 8 x 1016 Ω cm. Embrittlement point to - 60 ℃, can be used in conveying hot water. The group divided by b = 95/5. It can also be used to extrude the cable cables, good electrical insulation, acid, alkali, oil and organic solvents. The disadvantage is that the installation is difficult.
We can get these molecules that can't evaporate directly under these temperature and pressure conditions, but they're slowly degrading. It is also noted that the degradation of DDS at a given temperature is more rapid than the degradation of DDA. The observed cross-linking agent was very similar to the thermal aging behavior of the surface of the resin with temperature and pressure. These conclusions seem to confirm our assumptions about the chemical properties of nitrogen and sulfur molecules.
Experts confirm that oxygen has two functions at this stage, the a. Oxide polymer forms the TOL surface and the b. The surface free chain heat oxidation is the volatile component (SO2, NH3, HCN). In the aging process of low oxygen partial pressure, we observed that the free chain segment near the surface was partially depleted but the surface of the sample was obviously not oxidized. So it's inferred that under these conditions, oxygen first reacts to break down the free chain rather than the surface of the oxidation.
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
The main difference between sulfur and nitrogen peaks is their peak position. In contrast to the changes in the concentration of sulfur in the air, the peak of nitrogen does not shift away from the surface at the same time. These peaks depend on the difference between the speed of the chain segment and the rate of degradation of these segments. DDS appears to be losing weight faster than DDA. This can be inferred that the sulfur-containing segments degrade the nitrogen-containing segments faster.
This is a good explanation for why the peak of sulfur deviates from the surface. If you think that the segments of the migration are DDA and DDS themselves, then you can imagine that because of their respective sizes, the migration rate of the DDA molecule should be greater than DDS. Therefore, we believe that the above considerations determine the peak position observed.
In order to prove that the chain segment which was liberated by thermal decomposition and migrated to the surface is the crosslinking agent DDA and DDS, we studied their thermal behavior separately. We found that the cross-linking agent DDA and thermal behavior and migrate to the surface of the DDS itself free segment of the thermal behavior of similar: under the temperature higher than 150 ℃, they are under high vacuum are volatile and is not under atmospheric pressure.
In the air under atmospheric pressure, the crosslinking agent is slowly oxidized and degraded until it completely disappears. By the analysis of the weight analysis of heat degradation of the crosslinking agent, we obtained the degradation activation energy of DDS (142 + + 15) kJ/mol and DDA (140 + + 15) kJ/mol. These Numbers are very close to what the structural glue is measuring (130 plus or minus 4). Therefore, it is reasonable to think that the weightless process of structural glue is controlled by the degradation of the crosslinking agent which is transferred to the surface by the degradation of the chain.
Through the above hypothesis, to determine whether a sample that consists only of two types of crosslinking agent after aging of inert gas environment, the surface chemical composition and the properties of the surface. Under the condition of aging in the inert gas, we can predict that the surface will have a 77 percent mass fraction DDS and 23% of DDA, exactly the amount of the equivalent of one in one. All these conclusions are in support of our assumptions: in the process of thermal degradation of modification of epoxy resin, in the sample surface migration of segment is crosslinking agent DDA and DDS itself.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian