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Wet crosslinked paint crosslinking agent
2017-8-6 21:10:31
Wet crosslinked paint crosslinking agent
Wet crosslinking coating crosslinking agent crosslinking epoxy resin condition is water. Due to the particularity of the molecular structure of the wet crosslinking crosslinking agent, the reaction with epoxy resin in the presence of high humidity or water is especially applicable to the coating and civil construction field of outdoor operation. This kind of crosslinking agent mainly has ketoylamine and molecular sieve metal aluminum silicate particles.
Moist crosslinked crosslinking agent: ketoides. The ketone amines are synthesized from fatty polyamines and ketones, and the remaining polyamines in ketoides must be sealed with a single epoxide. Epoxy resin with ketone amine is used to absorb moisture in the air, and then reverse the reaction and regenerate polyamine.
Ketimine consists of ketone (such as methyl ethyl ketone, methyl isopropyl ketone and methyl isobutyl ketone) with multiple amine [such as diethylene triamine, m-phenylene diamine, between benzene dimethylamine and 1, 3 - (aminomethyl) cyclohexane, etc.] made by the condensation reaction, the residual multiple amine must use single epoxy compound closed.
It can be regenerated into a polyamine, so it can be crosslinked epoxy resin in wet or underwater, so it is called wet crosslinking agent. Diethylene triamine is the condensation of diethylene triamine and methyl isobutyl ketone, the molecular weight 267.45. Light yellow liquid, smell of ammonia. Viscosity of 25 ~ 30 mpa. S. Stable at room temperature.
It is used as the crosslinking agent for epoxy resin adhesive, the reference amount is 20 ~ 40, and it can be used for the preparation of the epoxy adhesive for moisture crosslinking single component, and the crosslinking condition is at room temperature / 24 ~ 48h. Research shows that methyl isopropyl ketone (MIPK) and methyl isobutyl ketone (MIBK) and 1, 3-2 (aminomethyl) cyclohexane (1, 3 - BAC) reaction of ketone imide, its storage stability and crosslinking reaction are ideal.
Chinese name: Diethyl toluene diamine(DETDA)Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
With polyether modified aliphatic amine diversity and methyl isobutyl ketone condensation and ketone imide, type latent epoxy resin is a kind of the good performance of crosslinking agent, with its mixture of one-component epoxy adhesive, improved the toughness and elongation at break of up to 150%, and stick relay is strong. It is also used as a single component polyurethane adhesive for latent moisture crosslinking agent.
At room temperature of crosslinking and crosslinking speed slower, applicable period for about 8 h, such as adding water or using aliphatic polyamine as promoter, can speed up the crosslinking, crosslinking content properties and polyamine crosslinking content basically the same.
Because the crosslinking is to absorb water, so it is not suitable for thick film crosslinking. In recent years, polyether modified amine and methyl isobutyl ketone were used in Japanese patents to prepare ketolamine as cross-linking agent for single - component epoxy adhesive. The crosslinking material has good toughness, the elongation rate reaches 150%, and has good adhesion to the plaster surface.
Molecular sieve adsorption type crosslinking agent. Molecular sieve is a three-dimensional crystalline metal aluminum silicate particle of 1 ~ 3Lm, which has excellent chemical stability except strong acid. The particle has a diameter of 0.4 ~ 1.0 nm and about 108 holes. These microporous adsorption lipids multimolecular sieves can be used as a moist coupler. The epoxy resin with this crosslinking agent is suitable for phase 1a, and the thickness of the film is less than 200 lm. It can be crosslinked in 30e after 4h.
Bisphenol A epoxy resin structure stability, and can be heated to 200 ℃ is not changed, other epoxy resin has infinite life, through cross-linking agent realize crosslinking reaction of epoxy resin as cross-linking process does not emit H2O or other low molecular compounds, epoxy crosslinking content avoids some type polycondensation polymer produced in the process of thermal crosslinking of bubbles and the porosity defect in interface. The performance of epoxy resin crosslinking is largely dependent on crosslinking agent, which has a wide variety.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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