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Waterborne alkyd resin and preparation method thereof

A technology of water-based alkyd resin and polyol, which is applied in coatings, polyester coatings, etc., can solve the problems of poor coating applicability and poor water resistance, and achieve improved initial water resistance, higher glass transition temperature, and better water release sexual effect

Inactive Publication Date: 2018-12-11
重庆南方漆业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The first purpose of the present invention is to provide a water-based alkyd resin to solve the technical problems of poor initial water resistance and poor coating applicability of the water-based alkyd resin existing in the prior art

Method used

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  • Waterborne alkyd resin and preparation method thereof

Examples

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preparation example Construction

[0041] The present invention also provides a kind of preparation method of described waterborne alkyd resin, comprises the steps:

[0042] (a) Mix linseed oil, maleic anhydride, isophthalic acid and polyols, keep warm at 220-230°C until the acid value is reduced to ≤10mg KOH / g, cool down to 140-150°C, add trimellitic anhydride, Heat preservation at 130-140°C to reduce the acid value to ≤60mg KOH / g to obtain material a;

[0043] (b) cooling material a to 110-120°C, adding acrylic monomers, and reacting at 120°C for 0.5-2 hours to obtain material b;

[0044] (c) The initiator is dissolved in part of the co-solvent, added to material b, kept warm for 0.5-2h, cooled to 95-105°C, added the rest of the co-solvent, cooled to 70-85°C, added neutralizer, and adjusted the pH value For 6-7, add water and stir evenly.

[0045] In a preferred embodiment of the present invention, in the step (c), the initiator is dissolved in 1 / 4-1 / 3 of the amount of co-solvent. More preferably, the init...

Embodiment 1

[0049] The water-based alkyd resin described in the present embodiment is made of the following components in parts by weight:

[0050] 19.34 parts of linseed oil, 0.44 parts of maleic anhydride, 10.55 parts of isophthalic acid, 14.06 parts of trimethylolpropane, 5.71 parts of trimellitic anhydride, 8.79 parts of methyl methacrylate, 0.88 parts of methacrylic acid, benzo peroxide Acyl 0.22 parts, 16.48 parts of propylene glycol methyl ether, 3.96 parts of N-methylmorpholine, 1.98 parts of N,N-dimethylethanolamine and 17.59 parts of water.

[0051] The preparation method step of described waterborne alkyd resin is as follows:

[0052] (1) Put linseed oil, maleic anhydride, isophthalic acid and trimethylolpropane into the reactor and start stirring. After slowly heating to 220-230°C, keep warm until the acid value drops to ≤10mg KOH / g, turn on the cold oil pump, lower the temperature to 150°C; when the temperature drops to 150°C, add trimellitic anhydride at one time, control ...

Embodiment 2

[0056] The water-based alkyd resin described in the present embodiment is made of the following components in parts by weight:

[0057] 20 parts of linseed oil, 0.5 parts of maleic anhydride, 10 parts of isophthalic acid, 15 parts of trimethylolpropane, 5 parts of trimellitic anhydride, 10 parts of methyl methacrylate, 1 part of methacrylic acid, Benzyl peroxide Acyl 0.3 parts, 17 parts of propylene glycol methyl ether, 2.6 parts of N-methylmorpholine, 1.3 parts of N,N-dimethylethanolamine and 20 parts of water.

[0058] Its preparation method refers to the preparation method described in Example 1, and the only difference is that in step (3), benzoyl peroxide is dissolved in 5 parts of propylene glycol methyl ether.

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Abstract

The invention relates to the technical field of waterborne functional resin, in particular to waterborne alkyd resin and a preparation method thereof .the waterborne alkyd resin is mainly prepared from the following components, in parts by weight: 15-25 parts of flax seed oil, 0.1-2 parts of maleic anhydride, 5-20 parts of isophthalic acid, 10-20 parts of polyhydric alcohol, 1-10 parts of trimellitic anhydride, 4-16 parts of acrylic monomer, 0.1-0.5 part of an initiator, 10-20 parts of cosolvent, 3-9 parts of a neutralizing agent and 10-30 parts of water. The prepared product is an aqueous dispersion, the content of the hydrophilic group is lower relative to that of waterborne alkyd resin, and the waterborne dispersing agent does not need to be added, and accordingly the initial water resistance of a paint film in the coating process is improved. The acrylic monomer is added so as to increase the glass transition temperature of the system, thus the system has the initial hardness, andgood water release property in the drying process, and under the condition of engineering coating, the risks that the paint film is damaged by rainwater and dew are eliminated.

Description

technical field [0001] The invention relates to the technical field of water-based functional resins, in particular to a water-based alkyd resin and a preparation method thereof. Background technique [0002] With the improvement of the national economy, the country's environmental protection requirements are becoming more and more stringent, and people's awareness of environmental protection is becoming stronger and stronger. Water-based coatings are an inevitable development trend. [0003] Solvent-based alkyd paint is widely used because of its simple construction, one-component self-drying, excellent comprehensive performance and high cost performance. Due to the pressure of environmental protection and the shortage of resources, people have been committed to converting solvent-based alkyd paints into water-based alkyd paints. With the widespread use of coating additives, the defoaming, leveling and self-drying problems faced by water-based alkyd paints have been solved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/49C09D167/08
CPCC08G63/48C09D167/08
Inventor 穆欣
Owner 重庆南方漆业有限公司
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