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Polyurethane modified epoxy resin and preparation method and electrophoretic coating thereof

A technology of polyurethane modification and epoxy resin, which is applied in the field of preparation of polyurethane modified epoxy resin and polyurethane modified epoxy resin. In order to solve problems such as poor strength, achieve strong metal adhesion, small deformation and shrinkage, and overcome poor weather resistance

Inactive Publication Date: 2017-09-15
GUANGDONG KODEST EP SC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the weather resistance of epoxy resin is poor, the fullness of the paint film is poor, and the paint film is easy to pulverize outdoors, so the paint film prepared by epoxy resin is often used as a primer, which is not suitable for outdoor coatings and high decorative performance coatings.
In order to improve the weather resistance of waterborne epoxy resin coatings, simple physical mixing of epoxy resin and polyurethane is generally used in the industry, but it has little effect

Method used

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  • Polyurethane modified epoxy resin and preparation method and electrophoretic coating thereof
  • Polyurethane modified epoxy resin and preparation method and electrophoretic coating thereof
  • Polyurethane modified epoxy resin and preparation method and electrophoretic coating thereof

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preparation example Construction

[0063] Correspondingly, the present invention also provides a kind of preparation method of polyurethane modified epoxy resin, comprises the following steps:

[0064] Step 1, take by weight 20-30% epoxy resin, 15-20% toluene diisocyanate, 3-6% polybutylene adipate, 5-10% polyether polyol, 2- 5% dimethylol propionic acid, 0.5-1.5% dibutyltin dilaurate, 4-8% cyclohexanedimethanol, 3-7% propylene glycol methyl ether acetate, 3-7% triethylamine and 15-25 % methyl ethyl ketone, stand-by.

[0065] Step 2: Add epoxy resin, toluene diisocyanate, polybutylene adipate, polyether polyol, butanone and propylene glycol methyl ether acetate into the reaction vessel, and keep warm at 100-120° C. for 2 hours.

[0066] It should be noted that the reaction vessel used in step 2 is a four-neck flask equipped with a stirrer, a reflux condenser, and a thermometer. Therefore, the reactants in step 2 are stirred, refluxed, and reacted at 100-120°C.

[0067] Step 3, after cooling down to 60°C, add di...

Embodiment 1

[0078] 1. Preparation of polyurethane modified epoxy resin

[0079] Step 1, take by weight 25% epoxy resin, 18% toluene diisocyanate, 5% polybutylene adipate, 8% polyether polyol, 2% dimethylol propionic acid, 1 % dibutyltin dilaurate, 6% cyclohexane dimethanol, 5% propylene glycol methyl ether acetate, 7% triethylamine and 23% methyl ethyl ketone, set aside.

[0080] Step 2, adding epoxy resin, toluene diisocyanate, polybutylene adipate, polyether polyol, butanone and propylene glycol methyl ether acetate into the reaction vessel, and keeping the temperature at 100-120° C. for 2 hours;

[0081] Step 3, after cooling down to 60°C, add dibutyltin dilaurate and butanone, and react at 60-80°C for 2 hours under reflux;

[0082] Step 4, after cooling down to 60°C again, add dimethylolpropionic acid, cyclohexanedimethanol, butanone, and reflux at 80-85°C for 4 hours;

[0083] Step 5, after detecting that the isocyanate blocking meets the requirements, slowly add triethylamine drop...

Embodiment 2

[0091] 1. Preparation of polyurethane modified epoxy resin

[0092] Step 1, take by weight 28% epoxy resin, 16% toluene diisocyanate, 6% polybutylene adipate, 10% polyether polyol, 5% dimethylol propionic acid, 1.3 % dibutyltin dilaurate, 7.2% cyclohexanedimethanol, 6.4% propylene glycol methyl ether acetate, 4.1% triethylamine and 16% butanone, set aside.

[0093] Step 2, adding epoxy resin, toluene diisocyanate, polybutylene adipate, polyether polyol, butanone and propylene glycol methyl ether acetate into the reaction vessel, and keeping the temperature at 100-120° C. for 2 hours;

[0094] Step 3, after cooling down to 60°C, add dibutyltin dilaurate and butanone, and react at 60-80°C for 2 hours under reflux;

[0095] Step 4, after cooling down to 60°C again, add dimethylolpropionic acid, cyclohexanedimethanol, butanone, and reflux at 80-85°C for 4 hours;

[0096] Step 5, after detecting that the isocyanate blocking meets the requirements, slowly add triethylamine dropwis...

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Abstract

The invention discloses polyurethane modified epoxy resin. The polyurethane modified epoxy resin is prepared from the following raw materials by weight percent: 20-30% of epoxy resin, 15-20% of toluene diisocynate, 3-6% of polybutylene adipate, 5-10% of polyether polyol, 2-5% of dimethylolpropionic acid, 0.5-1.5% of dibutyltin dilaurate, 4-8% of cyclohexanedimethanol, 3-7% of propylene glycol monomethyl ether acetate, 3-7% of triethylamine and 15-25% of butanone. The invention further discloses a preparation method of the polyurethane modified epoxy resin and an electrophoretic coating prepared from the polyurethane modified epoxy resin. The weatherability, the corrosion resistance and the glossiness of the water-borne epoxy resin electrophoretic coating are improved.

Description

technical field [0001] The present invention relates to the field of electrophoretic coatings, in particular to a polyurethane-modified epoxy resin used for manufacturing electrophoretic coatings, and the invention also relates to a preparation method of polyurethane-modified epoxy resin; Electrophoretic coatings prepared from epoxy resins. Background technique [0002] Epoxy resin has excellent physical and chemical properties after curing, such as high mechanical strength, strong adhesion, low shrinkage, good stability, excellent processing performance, etc., and is widely used in coatings, adhesives, electrical products, civil engineering Construction, composite materials and other fields. In particular, epoxy resin has excellent adhesion to metal and is widely used in the field of coatings. However, epoxy resin has poor weather resistance, poor fullness of the paint film, and the paint film is easy to pulverize and lose gloss outdoors. Therefore, the paint film prepare...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/48C08G18/58C08G18/65C08G18/66C08G18/76C09D175/04C09D7/12C09D5/44
CPCC08G18/4018C08G18/4045C08G18/4238C08G18/48C08G18/58C08G18/6541C08G18/6625C08G18/7614C08K5/42C09D5/4465C09D175/04
Inventor 李文庄高睿何愿文邓仲明杨波刘雪萍
Owner GUANGDONG KODEST EP SC CO LTD
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