News Details
Microcapsule coating crosslinking agent
2017-7-14 16:11:33
Microcapsule Coating crosslinking agent is a film that is active at room temperature with a film wrapped to form a capsule, under the heating or pressure conditions, capsules destroyed, the release of cross-linking agent and epoxy resin reaction.
Capsule damage is an important factor affecting the activity and stability of microcapsule crosslinker. Capsule film is too fragile, in the preparation or transport process vulnerable to damage caused by reduced storage; membrane is too strong, cross-linking requires a higher temperature and pressure.
Although the application of microcapsules in adhesives has already begun since the 1970s, the application has been so far due to the strict requirements of the preparation process, and its applications are mainly in a few areas such as fastening and pressure-sensitive adhesives. However, the research in each country is still very active, Every year new patents appear.
Hong Zongguo et al. Prepared a boron trifluoride microcapsule crosslinker by melt spray method. Take E-44 epoxy resin 10g, add acetone 6mL dilution, stir evenly, add 0.8g microcapsules, gently stir evenly, into a closed container in reserve. According to different bonding materials and the use of requirements, you can also add additives such as softener.
The boron trifluoride stabilizes coexistence with the epoxy resin through the blocking action of the wall, and the wall material is rapidly mixed and rapidly crosslinked when the wall material reaches the melting temperature. This latent thermal crosslinking adhesive can be stored at room temperature for more than 3 months and shear strength of 16MPa.
If the microwave is mainly through the thermal effect to improve the reaction rate, when the power is zero, due to the control of the entire system to maintain constant temperature, the reaction rate of the decline should be limited; if the reaction rate is mainly determined by the non-thermal effect, when the power is zero, , The reaction rate must be reduced to a large extent, that is, the reaction rate of continuous power microwave system should be significantly higher than the pulsating power microwave system, the experimental results prove this point. Due to the existence of pulsating power system and the impact of pulsating cycle, to obtain certain conclusions need to be further explored.
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
Capsule damage is an important factor affecting the activity and stability of microcapsule crosslinker. Capsule film is too fragile, in the preparation or transport process vulnerable to damage caused by reduced storage; membrane is too strong, cross-linking requires a higher temperature and pressure.
Although the application of microcapsules in adhesives has already begun since the 1970s, the application has been so far due to the strict requirements of the preparation process, and its applications are mainly in a few areas such as fastening and pressure-sensitive adhesives. However, the research in each country is still very active, Every year new patents appear.
Hong Zongguo et al. Prepared a boron trifluoride microcapsule crosslinker by melt spray method. Take E-44 epoxy resin 10g, add acetone 6mL dilution, stir evenly, add 0.8g microcapsules, gently stir evenly, into a closed container in reserve. According to different bonding materials and the use of requirements, you can also add additives such as softener.
The boron trifluoride stabilizes coexistence with the epoxy resin through the blocking action of the wall, and the wall material is rapidly mixed and rapidly crosslinked when the wall material reaches the melting temperature. This latent thermal crosslinking adhesive can be stored at room temperature for more than 3 months and shear strength of 16MPa.
If the microwave is mainly through the thermal effect to improve the reaction rate, when the power is zero, due to the control of the entire system to maintain constant temperature, the reaction rate of the decline should be limited; if the reaction rate is mainly determined by the non-thermal effect, when the power is zero, , The reaction rate must be reduced to a large extent, that is, the reaction rate of continuous power microwave system should be significantly higher than the pulsating power microwave system, the experimental results prove this point. Due to the existence of pulsating power system and the impact of pulsating cycle, to obtain certain conclusions need to be further explored.
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
UV cross-linking of epoxy resin (UV cross-linking) refers to the role of ultraviolet light, the system of photosensitive substances through the photochemical reaction to produce active particles or groups, which led to the system of active resin cross-linked polymerization. The technology does not need to use organic solvents, the environmental pollution is small, and has a fast cross-linking, saving energy, product performance, suitable for high-speed automated production lines and heat-sensitive substrate coating and so on.
At present, the commonly used UV cross-linking system can be divided into free radical photocrosslinking system and cationic photo-crosslinking system according to the different system. Free UV-based UV cross-linking system is fast, the performance is easy to adjust, but it is sensitive to oxygen, has high photocrosslinking shrinkage, poor adhesion, and is difficult to completely cross-linked three-dimensional parts. For this reason, cation cross-linking has become a research The development of hot; both the occurrence of free radical polymerization, but also the occurrence of photo-cationic polymerization of the new hybrid light crosslinking system also become active research and development areas.
In addition, in order to further expand the application range of photocrosslinking and improve the performance of photocrosslinking products, the cross-linking system combining photo-crosslinking with other crosslinking methods is also being studied and explored.
Cationic photocrosslinking refers to the cationic initiator in the ultraviolet radiation to produce protonic acid or Lewis acid, the formation of positive ion active center, triggering cationic ring-opening polymerization.
Compared with photoinitiated free radical polymerization, cationic crosslinking has the following characteristics: a suitable monomer type, in addition to unsaturated double bond with the monomer and prepolymer, but also for a variety of ring tension with the monomer and Prepolymers such as acetals, cyclic ethers, epoxides, lactones, sulfides and silicones. B is not oxygen-blocking, in the air atmosphere can be fast and complete polymerization, conducive to production, practical. C has a post-crosslinking effect, in practice, can shorten the light time, improve production efficiency and improve product quality.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
UV cross-linking of epoxy resin (UV cross-linking) refers to the role of ultraviolet light, the system of photosensitive substances through the photochemical reaction to produce active particles or groups, which led to the system of active resin cross-linked polymerization. The technology does not need to use organic solvents, the environmental pollution is small, and has a fast cross-linking, saving energy, product performance, suitable for high-speed automated production lines and heat-sensitive substrate coating and so on.
At present, the commonly used UV cross-linking system can be divided into free radical photocrosslinking system and cationic photo-crosslinking system according to the different system. Free UV-based UV cross-linking system is fast, the performance is easy to adjust, but it is sensitive to oxygen, has high photocrosslinking shrinkage, poor adhesion, and is difficult to completely cross-linked three-dimensional parts. For this reason, cation cross-linking has become a research The development of hot; both the occurrence of free radical polymerization, but also the occurrence of photo-cationic polymerization of the new hybrid light crosslinking system also become active research and development areas.
In addition, in order to further expand the application range of photocrosslinking and improve the performance of photocrosslinking products, the cross-linking system combining photo-crosslinking with other crosslinking methods is also being studied and explored.
Cationic photocrosslinking refers to the cationic initiator in the ultraviolet radiation to produce protonic acid or Lewis acid, the formation of positive ion active center, triggering cationic ring-opening polymerization.
Compared with photoinitiated free radical polymerization, cationic crosslinking has the following characteristics: a suitable monomer type, in addition to unsaturated double bond with the monomer and prepolymer, but also for a variety of ring tension with the monomer and Prepolymers such as acetals, cyclic ethers, epoxides, lactones, sulfides and silicones. B is not oxygen-blocking, in the air atmosphere can be fast and complete polymerization, conducive to production, practical. C has a post-crosslinking effect, in practice, can shorten the light time, improve production efficiency and improve product quality.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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