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Aqueous alkide resin emulsion and preparation thereof

A technology of water-based alkyd resin and alkyd resin, which is applied in the field of water-based alkyd resin emulsion and its preparation, and can solve the problems of poor storage stability, poor water resistance of coating, dryness, hardness, gloss and water resistance of film-forming materials Negative effects and other issues, to achieve the effect of improving storage stability

Active Publication Date: 2012-04-04
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since in the water-based alkyd resin molecule formed by this method, the ester bond that plays a connecting role is adjacent to the hydrophilic group, they are directly facing the "attack" of water, which also leads to poor storage stability, and the cured coating The water resistance of the first layer is not good; the third is to use an external small molecule emulsifier to realize the water-based alkyd resin
For example, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, etc. are used as emulsifiers of alkyd resins to realize the water-based alkyd resins. However, since these emulsifiers are usually low molecular weight surface active substances, It cannot participate in film formation, which has a negative impact on the dryness, hardness, gloss and water resistance of the final film formation
The disadvantages of the above-mentioned general method for making alkyd resin water-based have seriously affected the application of water-based alkyd resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 prepares adduct (abbreviation J)

[0025] (1) The formula is shown in Table 1;

[0026] (2) Specific operation

[0027] In a four-necked flask equipped with a stirrer, a thermometer, and a condenser device, add the polyethylene glycol monomethyl ether-1000 or polyethylene glycol monomethyl ether-2000) and the tetrahydrophthalic anhydride component of the formula amount in Table 1 , and adding a total amount of 0.1% (parts by weight) of triethylamine catalyst, slowly warming up to 190 ° C, constant temperature reaction to the theoretical acid value is qualified, and the adducts J1 and J2 are prepared and stored for later use;

[0028] Table 1

[0029] Adduct J1 J2 Polyethylene glycol monomethyl ether-1000 92.9 (0.046mol) - Polyethylene glycol monomethyl ether-2000 - 86.8 (0.087mol) tetrahydrophthalic anhydride 7.1 (0.047mol) 13.2 (0.087mol) Acid value of adduct (mgKOH / g) 26.5 49.0

[0030] Note 1: The molar r...

Embodiment 2

[0034] Embodiment 2 prepares emulsifier resin (abbreviation A)

[0035] (1) See Table 2-1, 2-2 and 2-3 for the formula;

[0036] Table 2-1 Raw material consumption when modified with adducts

[0037] raw material name A1 A2 A3 A4 dehydrated ricinoleic acid 35.9 42.9 42.9 46.5 Adduct J1 56.1 28.1 - - Adduct J2 - - 56.1 28.1 Phthalic anhydride 46.2 13.3 46.2 13.3 Trimethylolpropane 53.9 - 53.9 - pentaerythritol - 19.3 - 19.3 Reflux solvent (xylene) 20 20 20 20 Acid value of adduct modified alkyd resin prepolymer

(mgKOH / g)

3.5

2.1

4.3

3.3

[0038] Raw material consumption when table 2-2 is modified with polyurethane

[0039] raw material name A1 A2 A3 A4 Isophorone diisocyanate 19.8 13.6 19.8 13.6 Dimethylolpropionic acid 6.0 4.1 6.0 4.1 Dibutyl tin laurate 0.01 0.01 0.01 0.01 N-Methylpyrrolidone 60 30 60 30

Theoretica...

Embodiment 3

[0048] Embodiment 3 prepares main body alkyd resin (abbreviation B)

[0049] (1) The formula is shown in Table 3;

[0050] table 3

[0051] raw material name B1 B2 dehydrated ricinoleic acid 40.5 64.0 Phthalic anhydride 33.9 21.5 Trimethylolpropane 32.3 - pentaerythritol - 21.2 Reflux solvent (xylene) 20 20 Final control acid value (mgKOH / g) ≤5 ≤5 Hydroxyl value (mgKOH / g) 67.6 58.3

[0052] (2) Specific operation

[0053] In a four-neck flask equipped with a stirrer, a thermometer, a condenser, a water separator, and a nitrogen device, add all the raw material components in Table 3, turn on the nitrogen, and slowly heat up to 180°C for two hours of reflux dehydration, then heat up to Keep the reaction at 235°C for 8-9 hours, take a sample, and after the acid value is qualified, the solvent xylene is removed, and then the temperature is lowered and the material is discharged to prepare the main alkyd resins B1 a...

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PUM

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Abstract

The invention relates to a water alkyd resin emulsion and a preparation method thereof. The emulsion contains emulsifier resin and host alkyd resin, and the weight ratio of the two is between 3 to 1 and 1 to 3; emulsion particles are the host alkyd resin of which the exterior surface is surrounded by the emulsifier resin; the theoretical acid value of the emulsifier resin is between 10 and 20 milligram KOH / g; the emulsifier resin is formed by neutralizing alkyd resin via volatile amine, wherein the alkyd resin is obtained by jointly modifying an addition product and polyurethane; the dosage of the volatile amine is 1.0 to 2.5 percent of the gross weight of the emulsifier resin; the addition product is the polymer containing nonionic hydrophilic ether linkage; a molecule of the emulsifier resin contains anionic hydrophilic carboxyl and nonionic hydrophilic ether linkage; and the acid value of the host alkyd resin is less than or equal to 5 milligram KOH / g, and the host alkyd resin is hydrophobic resin. The coating-4 cup viscosity change of the emulsion is less than 5 percent after six-month storage, and is more than a half lower than the prior water alkyd resin emulsion sold on market, thereby the storage stability of the emulsion is obviously improved. A preparation method for the emulsion is simple and easy to operate.

Description

technical field [0001] The invention relates to a water-based alkyd resin emulsion and a preparation method thereof. In particular, an aqueous alkyd resin emulsion with improved storage stability and a method for preparing the same. Background technique [0002] Alkyd resin is a very important chemical product, which has a wide range of uses in coatings, inks and other fields. Alkyd resin or modified alkyd resin, because it contains more unsaturated bonds and hydroxyl groups, can realize air oxidation drying or baking crosslinking, and because its synthetic raw materials are easily available, it is used in various coatings The application is very extensive. The current alkyd resin is still mainly solvent-based, but with the economic development and environmental protection requirements, it has become a development trend to make alkyd resin water-based. There are three main methods for the water-based alkyd resin: the first is the salt-forming method. The most common is t...

Claims

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Application Information

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IPC IPC(8): C08L67/08C08L75/14C08J3/03C08G18/68C08G63/66
Inventor 胡中张汉青庄振宇祝宝英朱柯
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST