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Preparation of modified water-based alkyd amino coating!

 Last Update: 2021-11-12
 Source: Internet
 Author: User

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use glycolic acid

what high temperature

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Fatty acid; trimethylolpropane, technical grade; isophthalic acid, technical grade; maleic anhydride, technical grade; styrene, technical grade; methyl methacrylate, technical grade; acrylic acid, technical grade; acrylic acid hydroxy Ethyl ester, technical grade; initiator, reagent; xylene, technical grade; ethylene glycol monobutyl ether, technical grade; propylene glycol methyl ether, technical grade; butanol, technical grade; hexamethoxymethyl melamine (HMMM); Rutile titanium dioxide; triethylamine, industrial grade; deionized water, homemade
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Synthesis of modified water-based alkyd resin

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Put fatty acid, maleic anhydride, trimethylolpropane, isophthalic acid and reflux xylene into the reaction kettle, heat up to 180℃ for 1h, when the water output slows down, use 10℃/h heating rate The temperature is evenly raised to 220-230°C, and the temperature is kept for esterification.
After the acid value is 16-20mgKOH/g, the reflux xylene is removed by cooling and vacuum, and ethylene glycol butyl ether is added after cooling, and diluted for later use
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Synthesis of modified water-based alkyd resin

Heat the alkyd resin to 125-130°C, add dropwise a mixture of methyl methacrylate, acrylic acid, hydroxyethyl acrylate, styrene and part of the initiator over a period of 4.
5-5.
0h.
After the addition, keep it warm for 1h.
Add the remaining initiator in 2 times, keep the temperature for 1 hour; lower the temperature to 80°C, add an appropriate amount of ethylene glycol monobutyl ether, and dilute the standby coating online coatingol.
com
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Preparation of modified water-based alkyd amino coating

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Modified water-based alkyd resin: 32%～36%; pigment and filler: 22%～26%; hexamethoxymethyl melamine: 4%～7%; neutralizer: 2%～4%; co-solvent: 5% ～7%; Wetting, dispersing, leveling and defoaming additives: 1%～3%; Deionized water: 18%～40%
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Production process of modified water-based alkyd amino coating

Add part of the alkyd resin, cosolvent, neutralizer and deionized water in the formula; dilute the resin viscosity to a certain degree, adjust the pH to about 8, add wetting and dispersing agent and part of the defoaming agent, and add the color under stirring.
After the filler is dispersed at high speed, it is ground by a sand mill to a fineness of ≤30μm, and the remaining resin, cosolvent, additives and composite corrosion inhibitor are added; after stirring, adjust the pH value to about 8 again, and use the remaining Deionized water adjusts the viscosity of the paint solution, and filters and packs it after it is qualified
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4.
The properties of modified water-based alkyd amino coatings are shown in Table 4-21
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Table 4-21 Performance Index of Modified Waterborne Alkyd Amino Coating

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project

Test results

project

Test results

Paint film color and appearance

Viscosity [paint-4 cups, (25±1)℃]/s

Fineness/μm

Solid content/%

Drying time (80～100℃)/min

Adhesion (circle method)/level

The paint film is flat and smooth

≥100

≤30

≥45

≤30

Pendulum hardness

Flexibility/mm

Impact strength/kgf ● cm

Water resistance

Salt spray resistance

≥0.

060

≤1

≥50

120h no blistering, no wrinkle

120h no blistering, no rust

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Five, the characteristics of the product

The water-based alkyd amino coating inherits the advantages of the solvent-based amino coating, and has obtained good color retention, gloss retention, weather resistance, durability, corrosion resistance, fast drying and high hardness through modification.

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