News Details
Moisture-activated latent paint crosslinking agent
2017-7-10 16:30:52
Moisture-activated latent paint crosslinking agent in the presence of high humidity or water to live and react with the epoxy resin, the most representative of the moisture-activated latent cross-linking agent is ketimine compounds and adsorption Aliphatic aluminosilicate molecular sieves and the like.
Moisture-activated latent paraffin compounds in latent cross-linking agents. This type of cross-linking agent research more, from the aliphatic polyamines and ketones for nucleophilic addition reaction dehydration, in order to control the reactivity, the residual amine in the molecule must be closed with a single epoxy compound.
It is a mixture of epoxy resin composed of one-component epoxy adhesive can absorb moisture in the air or contact with moisture on the wet adhesive surface of the cross-linking agent dissociation, re-release of amine compounds and epoxy resin at room temperature crosslinking.
But there is a problem that the crosslinking speed is slow and the storage stability is insufficient (the application period is about 8h), and the solitary electrons in the nitrogen atom of the ketimine molecule are susceptible to nucleophilic attack on the epoxy group, Leading to system stickiness or gelation.
At present, one by adding water or with aliphatic polyamine as accelerator and process on the use of thinner coating to speed up its cross-linking speed; Second, Takeda Min and other clever use of the larger steric hindered groups on ketone The protection of the nucleus on the nitrogen atom of the amine molecule effectively inhibits the nucleophilic ring-opening polymerization of the epoxy group, and also improves the storage stability while maintaining rapid crosslinking.
Of course, the choice of group is very important, the size of the steric group is too large will affect the ketone imine hydrolysis of water molecules into, and thus affect the rate of cross-linking. The use of ketone imine latent cross-linking agent at room temperature cross-linked single-component epoxy adhesive as a civil engineering glue, can be used for prefabricated concrete components of the bonding, the cross-linking properties, bonding strength, etc. have reached the bridge with epoxy resin Adhesive standards.
The use of polyether modified amine compounds and methyl isobutyl ketone condensation of ketoimine prepared as latent cross-linker preparation of single-component epoxy adhesive, the cross-linked products have greatly improved the brittleness Toughness, elongation up to 150%, and the mortar has a good adhesion.
Aluminosilicate molecular sieve adsorption type. In addition to natural zeolite, the synthetic zeolite-type hydrated aluminosilicate molecular sieves have been dozens, the most important is A, X, Y and mordenite type. Molecular sieves have a porous skeleton structure, which has a number of uniform pore channels and arranged neatly, within the surface of the relatively large holes.
The sum of the number of Al3 + and Si4 + in the aluminosilicate molecular sieve MX [AlySizO2 (y + z)] mH2O is 1: 2, and the number of Al3 + in the aluminosilicate is less than that of the Si4 + The
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
Moisture-activated latent paraffin compounds in latent cross-linking agents. This type of cross-linking agent research more, from the aliphatic polyamines and ketones for nucleophilic addition reaction dehydration, in order to control the reactivity, the residual amine in the molecule must be closed with a single epoxy compound.
It is a mixture of epoxy resin composed of one-component epoxy adhesive can absorb moisture in the air or contact with moisture on the wet adhesive surface of the cross-linking agent dissociation, re-release of amine compounds and epoxy resin at room temperature crosslinking.
But there is a problem that the crosslinking speed is slow and the storage stability is insufficient (the application period is about 8h), and the solitary electrons in the nitrogen atom of the ketimine molecule are susceptible to nucleophilic attack on the epoxy group, Leading to system stickiness or gelation.
At present, one by adding water or with aliphatic polyamine as accelerator and process on the use of thinner coating to speed up its cross-linking speed; Second, Takeda Min and other clever use of the larger steric hindered groups on ketone The protection of the nucleus on the nitrogen atom of the amine molecule effectively inhibits the nucleophilic ring-opening polymerization of the epoxy group, and also improves the storage stability while maintaining rapid crosslinking.
Of course, the choice of group is very important, the size of the steric group is too large will affect the ketone imine hydrolysis of water molecules into, and thus affect the rate of cross-linking. The use of ketone imine latent cross-linking agent at room temperature cross-linked single-component epoxy adhesive as a civil engineering glue, can be used for prefabricated concrete components of the bonding, the cross-linking properties, bonding strength, etc. have reached the bridge with epoxy resin Adhesive standards.
The use of polyether modified amine compounds and methyl isobutyl ketone condensation of ketoimine prepared as latent cross-linker preparation of single-component epoxy adhesive, the cross-linked products have greatly improved the brittleness Toughness, elongation up to 150%, and the mortar has a good adhesion.
Aluminosilicate molecular sieve adsorption type. In addition to natural zeolite, the synthetic zeolite-type hydrated aluminosilicate molecular sieves have been dozens, the most important is A, X, Y and mordenite type. Molecular sieves have a porous skeleton structure, which has a number of uniform pore channels and arranged neatly, within the surface of the relatively large holes.
The sum of the number of Al3 + and Si4 + in the aluminosilicate molecular sieve MX [AlySizO2 (y + z)] mH2O is 1: 2, and the number of Al3 + in the aluminosilicate is less than that of the Si4 + The
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
SiO4 tetrahedra and AlO4 tetrahedra are connected by a common angle of oxygen atoms from the multi-ring, the pore size of the molecular sieve window, the adsorption molecules through the window into the internal. Adsorption of aliphatic or alicyclic polyamines 1 ~ 3μm size of the molecular sieve particles have good chemical stability and thermal stability.
For one-component epoxy adhesive moisture analysis, the release of adsorbate and participate in cross-linking reaction. It has good storage stability, the application period can be up to 1 year, the thickness of 200μm below the coating at about 30 ℃, 4h after moisture can be cross-linked.
The composition and choice of the wall material have little effect on the solubility, slow release and fluidity of the microcapsules, and the wall material is not reacted or miscible with the core material. Generally, the oil-soluble core material adopts water-soluble wall material, water-soluble core Material is the use of oil-soluble wall materials.
Microcapsule granulation technology with natural macromolecules, semi-synthetic macromolecules and synthetic macromolecules has been reported. The application of microcapsules in adhesives begins with the production of anaerobic adhesives. The microcapsules may be ruptured by heating, pressurized or chemically treated to release the core material into the reaction. Microcapsules for the preparation of one-component epoxy adhesive has also been a lot of reports.
The effects of different urinary / aldehyde ratio, temperature, pH value and stirring speed on the properties of microcapsules were studied by using in-situ polymerization method as the core material. influences.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
SiO4 tetrahedra and AlO4 tetrahedra are connected by a common angle of oxygen atoms from the multi-ring, the pore size of the molecular sieve window, the adsorption molecules through the window into the internal. Adsorption of aliphatic or alicyclic polyamines 1 ~ 3μm size of the molecular sieve particles have good chemical stability and thermal stability.
For one-component epoxy adhesive moisture analysis, the release of adsorbate and participate in cross-linking reaction. It has good storage stability, the application period can be up to 1 year, the thickness of 200μm below the coating at about 30 ℃, 4h after moisture can be cross-linked.
The composition and choice of the wall material have little effect on the solubility, slow release and fluidity of the microcapsules, and the wall material is not reacted or miscible with the core material. Generally, the oil-soluble core material adopts water-soluble wall material, water-soluble core Material is the use of oil-soluble wall materials.
Microcapsule granulation technology with natural macromolecules, semi-synthetic macromolecules and synthetic macromolecules has been reported. The application of microcapsules in adhesives begins with the production of anaerobic adhesives. The microcapsules may be ruptured by heating, pressurized or chemically treated to release the core material into the reaction. Microcapsules for the preparation of one-component epoxy adhesive has also been a lot of reports.
The effects of different urinary / aldehyde ratio, temperature, pH value and stirring speed on the properties of microcapsules were studied by using in-situ polymerization method as the core material. influences.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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