News Details
Epoxy crosslinking agent on the properties of coatings
2017-3-9 16:06:25
Epoxy crosslinking agent on the properties of coatings,The performance of epoxy resin coating with epoxy cross-linking type of promoters have bigger difference, mainly displays in the following aspects:
(1) to improve the mechanical properties of epoxy resin coating.
Epoxy resin coatings of high reactivity, crosslink density is big, so the corrosion resistance of coating is good. But at the same time there is also a lack of physical and mechanical properties, such as poor elasticity, big issues such as brittleness, by introducing a flexible chain segment of crosslinking agent, such as with long chain fatty acid polyamide to be improved.
(2) improve process performance of epoxy resin coating.
Epoxy resin coatings are often at the scene of mass construction, exist volatiles toxicity and operability in wet or humid and low temperature environment. At home and abroad in recent years developed a variety of non-toxic or low toxic, and it has excellent workability, mechanical properties and corrosion resistance of modified crosslinking agent, crosslinking agent such as modified ketone imide.
(3) improve the corrosion resistance of epoxy resin coating.
The corrosion resistance of different epoxy crosslinking system also has bigger difference. Amine crosslinker crosslinked epoxy resin good alkali resistance and acid resistance is poorer, the tertiary amine formed after crosslinking structure easy reacts with an acid to form a tertiary ammonium salt. Crosslinking agent crosslinked epoxy resin and anhydride on the contrary, good resistance to acid and alkali resistance is poorer, the ester formed after crosslinking base under the condition of alkaline hydrolysis occurs irreversible reaction.
(4) improve the temperature resistance of epoxy resin coating.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Using aliphatic amine crosslinking agent crosslinked epoxy resin, its thermal deformation temperature is low, usually only about 70 ~ 80 ℃. Use appropriate aromatic kind of crosslinking agent, crosslinking agent, or anhydride can make the thermal deformation temperature up to 150 ℃ or so, but after the two types of crosslinking agent alone the general needs cross-linking under heating conditions.
(5) improve the dielectric properties of epoxy resin coating.
When epoxy resin used for insulating paint, can choose to use partial benzene 2 improvement of anhydride copolymer as crosslinking agent, can obviously improve the heat resistance and dielectric performance of coatings.
Respectively in the self-made elastic crosslinking agent to join different ratio N75 N3390 and crosslinking agent, the tensile strength of the coating obtained with N75 and N3390 content is gradually increasing with the increase of elongation at break along with the augment of N75 and N3390 content gradually reduced.
This is because the N75 and N3390 are three functions of small molecules rigid crosslinking agent, its content is higher, the junction in the coating, the coating between molecular chains in the crosslinking density, the greater the coating the higher tensile strength, elongation at break is lower.
N75 of HDI biuret structure, its molecular structure is no ring structure; N3390 for HDI trimer structure, its molecular structure contains a six-member ring structure, so add the same amount of N3390 than add N75 enhancement effect is good, but the elongation at break after adding N3390 is low; When after N75 and N3390 content more than 15%, the tensile strength rise is not obvious, and elongation at break down is very obvious. Therefore, rigid crosslinking agent with 15% advisable.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
(1) to improve the mechanical properties of epoxy resin coating.
Epoxy resin coatings of high reactivity, crosslink density is big, so the corrosion resistance of coating is good. But at the same time there is also a lack of physical and mechanical properties, such as poor elasticity, big issues such as brittleness, by introducing a flexible chain segment of crosslinking agent, such as with long chain fatty acid polyamide to be improved.
(2) improve process performance of epoxy resin coating.
Epoxy resin coatings are often at the scene of mass construction, exist volatiles toxicity and operability in wet or humid and low temperature environment. At home and abroad in recent years developed a variety of non-toxic or low toxic, and it has excellent workability, mechanical properties and corrosion resistance of modified crosslinking agent, crosslinking agent such as modified ketone imide.
(3) improve the corrosion resistance of epoxy resin coating.
The corrosion resistance of different epoxy crosslinking system also has bigger difference. Amine crosslinker crosslinked epoxy resin good alkali resistance and acid resistance is poorer, the tertiary amine formed after crosslinking structure easy reacts with an acid to form a tertiary ammonium salt. Crosslinking agent crosslinked epoxy resin and anhydride on the contrary, good resistance to acid and alkali resistance is poorer, the ester formed after crosslinking base under the condition of alkaline hydrolysis occurs irreversible reaction.
(4) improve the temperature resistance of epoxy resin coating.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Using aliphatic amine crosslinking agent crosslinked epoxy resin, its thermal deformation temperature is low, usually only about 70 ~ 80 ℃. Use appropriate aromatic kind of crosslinking agent, crosslinking agent, or anhydride can make the thermal deformation temperature up to 150 ℃ or so, but after the two types of crosslinking agent alone the general needs cross-linking under heating conditions.
(5) improve the dielectric properties of epoxy resin coating.
When epoxy resin used for insulating paint, can choose to use partial benzene 2 improvement of anhydride copolymer as crosslinking agent, can obviously improve the heat resistance and dielectric performance of coatings.
Respectively in the self-made elastic crosslinking agent to join different ratio N75 N3390 and crosslinking agent, the tensile strength of the coating obtained with N75 and N3390 content is gradually increasing with the increase of elongation at break along with the augment of N75 and N3390 content gradually reduced.
This is because the N75 and N3390 are three functions of small molecules rigid crosslinking agent, its content is higher, the junction in the coating, the coating between molecular chains in the crosslinking density, the greater the coating the higher tensile strength, elongation at break is lower.
N75 of HDI biuret structure, its molecular structure is no ring structure; N3390 for HDI trimer structure, its molecular structure contains a six-member ring structure, so add the same amount of N3390 than add N75 enhancement effect is good, but the elongation at break after adding N3390 is low; When after N75 and N3390 content more than 15%, the tensile strength rise is not obvious, and elongation at break down is very obvious. Therefore, rigid crosslinking agent with 15% advisable.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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