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Low temperature coating crosslinking agent

2017-8-20 23:50:37

Low temperature coating crosslinking agent

It is a dynamic field of technology development to improve the epoxy/amine paint base system for low temperature crosslinking coatings. Using low temperature crosslinking agent of epoxy coating can extend the construction season, because this kind of paint when the temperature dropped below 50 ° F (10 ℃) can still construction.

This paper discusses the basic view of low-temperature crosslinking agent technology for low temperature crosslinking epoxy/amine coating system. The coating properties of several low-temperature crosslinking agents and standard liquid epoxy resin were studied.

The system have been at 40 ° F (4.5 ℃) crosslinking rate using differential scanning heat meter (DSC) continuous testing cycle (14 days). Got in the standard room temperature (25 ℃, 55% relative humidity) and lower than the standard room temperature and high humidity in (10 ℃, relative humidity 90% and 4.5 ° C, relative humidity 80%) crosslinking varnish film performance.

In this study, a new approach to low temperature crosslinking epoxy coatings was discussed. The new approach is to use polyacrylate epoxy resin with low temperature crosslinking agent.

The results show that the new base material system can improve the transparency of paint, the anti - whiteness, and the ability to crosslink well under low temperature and high humidity.

In today's marketing world, formulation of epoxy/amine coating designers facing the dual challenges, which should not only meet the requirements of VOC regulations, and to optimize the performance/price ratio of coating (relative to the previous industrial standards). Traditional epoxy polyamide coatings have been used in industry for more than 40 years.

However, new crosslinking techniques have been used to overcome some of the common limitations of polyamide. In recent years, these new crosslinking techniques have been used for the crosslinking agent, which is specially used for low temperature crosslinking epoxy coatings. Low crosslinked coatings its construction period can be extended to during autumn or early, because the coating construction even when the temperature dropped below 10 ℃ still can continue.

This paper provides a general view of the crosslinking technology of low-temperature epoxy coatings. The properties of the varnish film of the four kinds of low-temperature amine crosslinking agent were measured. The crosslinking rate of this type of paint is monitored by differential scanning calorimeter (DSC). This paper summarizes the evaluation of new approaches to the preparation of low temperature epoxy/amine coatings.

The new approach is to use low temperature crosslinking agent and polyacrylate epoxy resin. The method improves the transparency of the film, the anti-whiteness, and the crosslinking performance under low temperature and high humidity. One problem, however, is that the new system has a short period of application.

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

Technical route of low temperature crosslinking coating:

Epoxy/amine promoter for low temperature (10 ℃ or less) construction coating, epoxy/amine to shorten the drying time and improve the crosslinking rate of a kind of way is to promote the reaction of epoxy - amine. The simplified epoxy-amine reaction is shown in equation 1:

There are several types of chemicals can accelerate the crosslinking reaction, such as: organic acids (e.g., salicylic acid, benzoic acid or), tertiary amine (such as BDMA benzyl dimethylamine or 3-2 minus dimethylamine cresol), alcohols (methanol), water, alkylation of phenol (e.g., nonylphenol, bisphenol - A) and aliphatic amines (such as DETA or diethyl triamine, TETA triethyl amine four). The amount of accelerant needed to obtain the appropriate crosslinking rate depends on the type of promoter and its concentration in the final formula.

It is used for underground waterproofing work, which can be used as "external anti-coating method" and "external anti-internal coating method". Thickness according to the requirement of plane parts coated one to two times, the facade is only two to three times, the first time to use now adjusted the low viscosity of coating with a full, facade blade coating in the second, three times to avoid flow, coating and water must be beaten, placed more than 10 minutes, make viscosity increases after some besmear again, so that both the thickness and flowing.

With a large number of pile head and irregular shape of the foundation, for the space is little, underground pipes more kitchen, toilet bath room, it is difficult to use coil, is a difficulty of waterproof project, and can be made into large overall high strength elastic coating, waterproof effect is good.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd

Diethyl toluene diamine(DETDA) http://www.yaruichem.com

Isopropylphenyl Phosphate(IPPP50)

Tris(2-chloroisopropyl)Phosphate(TCPP)

Triphenyl Phosphite (TPPI)

Triphenyl Phosphate (TPP)

Triethyl Phosphate (TEP)

4-Chlorobenzoic acid (PBCA)

Dimethyl thiotoluene diamine(DMTDA)

Diethyl toluene diamine(DETDA)

9-anthracene

Trimethyl Phosphate (TMP)

Isopropylphenyl Phosphate(IPPP65)