Low-temperature quick-drying solvent-free epoxy coating for drinking water tank and preparation method thereof

An epoxy coating, solvent-free technology, applied in the field of coating manufacturing, can solve the problems of slow reaction speed, long hardening time, difficult to adapt to the requirements of coating process, etc., and achieve the effect of fast drying speed

Inactive Publication Date: 2011-04-13

COSCO KANSAI PAINT & CHEM TIANJIN +2

7 Cites 26 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] In addition, when the general solvent-free epoxy coating is at a low temperature of about 10°C, the reaction ...

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Abstract

The invention relates to a low-temperature quick-drying solvent-free epoxy coating for a drinking water tank and a preparation method thereof, wherein epoxy resin, a reactive diluent, a dispersant, a silane coupling agent, a thixotropic additive, titanium dioxide, talcum powder, a defoamer, a modified aromatic amine curing agent and a catalyst are used for constituting an A component and a B component; when in use, the A component and the B component are mixed according to the mixing weight ratio of 7.5/1-8.5/1, the mixing viscosity under the low-temperature condition of 10-15 DEG C is 3000-5000mPa.s, the operable time is 1-2 hours, the semi-hardening time is 6-8 hours, and the hardening time is 20-24 hours. The epoxy coating has excellent coating constructability and drying property of acoating film. The epoxy coating is solvent-free and non-toxic, has low viscosity under the low-temperature condition of 10 DEG C, and ensures normal construction can be carried out without taking heating and thermal insulation measures; simultaneously, the drying speed of the coating film is fast, and the requirement of low-temperature construction process in winter can be completely met. The coating is particularly applicable to drinking water tanks of naval ships, as well as coating protection of the inner walls of large storage tanks in the food industry under the low-temperature condition.

Application Domain

Epoxy resin coatings

Technology Topic

SolventThermal insulation +10

Image

Examples

Experimental program(3)

Example Embodiment

[0044] Example 1:

[0045] 1) Preparation of epoxy component: Put 25 parts by weight of small molecule bisphenol F epoxy resin (GY282), 9 parts by weight of reactive diluent (HELOXY modifier 65), and 0.5 parts by weight of dispersant ( SOLSPERS37500), 1.0 parts by weight of silane coupling agent (KBM-403), 0.5 parts by weight of defoamer (AC-300), start stirring, and add the following components separately under the condition of starting the stirring: 4 parts by weight of thixotropic agent ( VA-750B), 7 parts by weight of titanium dioxide (R-930), 53 parts by weight of low oil absorption talcum powder, dispersed at high speed for 30 minutes, then grind to standard fineness with sand mill or three-roll mill, filter and package into paint A component.

[0046] 2) Put 95 parts by weight of the commercially available modified aromatic amine curing agent Aradur 847 and 5 parts by weight of K-54 into the dispersion kettle and mix them evenly, then pack them into small buckets according to the matching requirements to form the B component of the coating.

[0047] When in use, mix the two components of A and B at a weight ratio of 7.5:1 before spraying.

[0048] The workability and film performance after mixing the two components are as follows:

[0049] The mixed viscosity at a low temperature of 10-15°C is 3000-5000mPa.s, the working time is 1-2 hours, the semi-hardening time is 6-8 hours, and the hardening time is 20-24 hours. It has excellent coating workability and coating film drying properties. The performance indicators of the coating film formed by spraying are as follows:

[0050] Adhesion 6MPa; flexibility 2mm;

[0051] 1000 hours of salt spray resistance, no change in paint film.

[0052] There is no change in the paint film after 3 months of seawater immersion at 40℃;

[0053] There is no change in the paint film for 14 days in the 40/20℃ temperature difference water resistance test.

[0054] There is no change in the paint film for 14 days in the 40/20℃ temperature difference water resistance test.

Example Embodiment

[0055] Example 2:

[0056] 3) Preparation of epoxy component: Put 22 parts by weight of small molecule bisphenol F epoxy resin (GY282), 11 parts by weight of reactive diluent (HELOXY modifier 65), and 0.6 parts by weight of dispersant ( SOLSPERS37500), 0.9 parts by weight of silane coupling agent (KBM-403), 0.4 parts by weight of defoaming agent (AC-300), start to stir evenly, and add the following components separately under the condition of starting the stirring: 5 parts by weight of thixotropic agent ( VA-750B), 7.5 parts by weight of titanium dioxide (R-930), 51.6 parts by weight of low oil absorption talcum powder, dispersed at high speed for 30 minutes, and then ground to standard fineness with a sand mill or three-roll mill, filtered and packaged to become paint A component.

[0057] 4) Put 95 parts by weight of the commercially available modified aromatic amine curing agent Aradur 847 and 5 parts by weight of K-54 into the dispersion kettle and mix them evenly, and then pack them into small buckets according to the matching requirements to form component B of the coating.

[0058] When in use, mix the two components of A and B in a ratio of 8:1 by weight and spray. The paint workability and film properties are similar to those of Example 1.

Example Embodiment

[0059] Example 3:

[0060] 5) Preparation of epoxy component: Put 20 parts by weight of small molecule bisphenol F epoxy resin (GY282), 14 parts by weight of reactive diluent (HELOXY modifier 65), and 0.7 parts by weight of dispersant ( SOLSPERS37500), 1.1 parts by weight of silane coupling agent (KBM-403), 0.2 parts by weight of defoaming agent (AC-300), start to stir evenly, and add the following components separately when stirring is started: 6 parts by weight of thixotropic agent ( VA-750B), 8 parts by weight of titanium dioxide (R-930), 50 parts by weight of low oil absorption talcum powder, dispersed at high speed for 30 minutes, and then ground to standard fineness with a sand mill or three-roll mill, filtered and packed into paint A component.

[0061] 6) Put 95 parts by weight of the commercially available modified aromatic amine curing agent Aradur 847 and 5 parts by weight of K-54 into the dispersion kettle and mix them evenly, then pack them into small buckets and package them to form the B component of the coating.

[0062] When in use, the two components of A and B are mixed in a weight ratio of 8.5:1 and then sprayed. The paint workability and film properties are similar to those of Example 1.

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PUM

Property	Measurement	Unit
Flexibility	2.0	mm
Adhesion	6.0
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Fast drying

Low-temperature quick-drying solvent-free epoxy coating for drinking water tank and preparation method thereof

An epoxy coating, solvent-free technology, applied in the field of coating manufacturing, can solve the problems of slow reaction speed, long hardening time, difficult to adapt to the requirements of coating process, etc., and achieve the effect of fast drying speed

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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