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Water alkyd resin emulsion and preparing method thereof

A technology of water-based alkyd resin and alkyd resin, which is applied in coatings, polyester coatings, etc., can solve the problems of adverse effects on coating film drying performance and negative effects on coating film performance and water resistance, and achieve excellent storage stability and avoid Degradation effect

Active Publication Date: 2007-12-12
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Emulsifiers are generally low molecular weight surface active substances. Since small molecule emulsifiers cannot participate in film formation and are mainly distributed on the surface of the coating film and the interface between the coating film and the substrate, it will affect the performance of the coating film (such as water resistance, etc.) Negative impact; Although some documents also disclose some special emulsifier resins for emulsifying alkyd resins, such as adopting the method of emulsifying alkyd resins with polyurethane polyurea resins with terminal hydroxyl groups to prepare water-based alkyd resins, but Since the hydroxyl-terminated polyurethane polyurea resin does not contain unsaturated bonds, it cannot participate in the drying and curing of the alkyd resin, which will adversely affect the drying performance of the coating film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Preparation of alkyd resin (A2) and alkyd resin (B)

[0045] The raw materials for preparing resins are all commercially available. The formula is as shown in Table 1:

[0046] Table I

[0047] raw material name

Alkyd resin (A2)

Alkyd resin (B)

I alcoholysis process

① Alkaline bleached linseed oil

②Glycerin

③LiOH

61.2

15.28

0.01

61.2

12.86

0.01

II Esterification process

④ Phthalic anhydride

⑤ Catalyst (Dibutyltin Oxide)

⑥ Reflux solvent (xylene)

30

0.01

20

30

0.01

20

Final control acid value (mgKOH / g)

≤5

≤5

Hydroxyl value (mgKOH / g)

59

20

[0048] In a four-necked flask equipped with a stirrer, a thermometer, a condenser, a water separator and a nitrogen device, add the raw material components of the alcoholysis process formula in Table 1, open...

Embodiment 2

[0060] 1) Preparation of alkyd resin (A2) and alkyd resin (B)

[0061] The raw materials for preparing resins are all commercially available. The formula is as shown in Table 3:

[0062] Table three

[0063] raw material name

Alkyd resin (A2)

Alkyd resin (B)

①Soyoleic acid

②Trimethylolpropane

③ Phthalic anhydride

④ Catalyst (Dibutyltin Oxide)

⑤ Reflux solvent (toluene)

46.7

29.0

24.3

0.01

20.0

46.7

26.3

27.0

0.01

20.0

Final control acid value (mgKOH / g)

≤5

≤5

Hydroxyl value (mgKOH / g)

35

16

[0064] In a four-necked 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, slowly raise the temperature to 245 ° C, and keep the reflux dehydration reaction for 8 to 9 hours Finally, take a sample, and af...

Embodiment 3

[0076] 1) The preparation of the alkyd resin (A2) is the same as that of the alkyd resin (A2) in Example 1, and the preparation of the alkyd resin (B) is the same as that of the alkyd resin (B) in Example 2.

[0077] 2) The preparation of the polyurethane resin (A1) is the same as the preparation of the polyurethane resin (A1) in Example 1.

[0078] 3) The preparation of the emulsifier resin (A) is the same as the preparation of the emulsifier resin (A) in Example 1.

[0079] 4) Preparation of water-based alkyd resin emulsion

[0080] Take 200 parts of the emulsifier resin (A) and 100 parts of the alkyd resin (B) prepared above, stir evenly, and slowly add 115 parts of water under high-speed stirring, disperse evenly, and discharge the material to obtain the emulsion of the present invention . It is a light yellow milky liquid, the solid content is about 55%, the pH value is 7.6, and the viscosity change (storage for 6 months, coated with -4 cups) is less than 5%.

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Abstract

The invention relates to a water- brone alkyd resin emulsion with distinctive storage performance. The emulsifying resin (A) and alkyd resin (B) with acid value less than 5mg / KOH / g are mixed according to weight ratio of 3: 1- 1: 3, water is added slowly and at the same is stirred at high speed for dispersion. The emulsifying resin (A) is produced through polymerization with polyurethane resin (A1) with theoretical acid value being 20- 45 mg KOH / g, and alkyd resin (A2) with its acid value no more than 5 mg KOH / g and hydroxyl value no less than 30 mgKOH / g according to proportion of 1:1 - 1:3 and neutralization with volatile amine. The emulsion can be prepard into air oxidation dried coating or baked coating, suitable for normal industrial protective coating or domestic coating field. It can be used as surface coating and bottom coating.

Description

technical field [0001] The invention relates to a water-based alkyd resin emulsion and a preparation method thereof, in particular to a water-based alkyd resin emulsion with excellent storage stability obtained by using polyurethane modified alkyd resin as the emulsifier resin of the main alkyd resin and its preparation method. Background technique [0002] Alkyd resin or modified alkyd resin, because it contains more unsaturated bonds, can be oxidized and dried by air or accelerated drying, and is widely used in various coatings. Due to environmental requirements, water-based alkyd resin has become a development trend. [0003] At present, there are two main principles for making alkyd resin water-based. The first one is to introduce a large number of hydrophilic groups (carboxyl groups) on the side chain of alkyd resin molecules, and neutralize part of the hydrophilic groups to form a salt. To achieve stable dispersion in water. [0004] The aqueous alkyd resin that thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J3/07C09D167/04C08L75/04
Inventor 胡中董观秀严俊祝宝英
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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