High solid constituent epoxy coating composition

A technology for separating epoxy and composition, applied in the field of high-solid epoxy coating composition, can solve the problems of poor flexibility and brittleness of coating film, no chemical bonding, cracking of coating film, etc., to meet environmental protection requirements, excellent anti-corrosion Effects of sex and chemical resistance

Active Publication Date: 2012-08-15
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The epoxy coating thus prepared has a high solid content, low VOC content, and has excellent corrosion resistance and chemical resistance, but the coating film has poor flexibility and brittleness, and is used in alternating environments (for example, seawater in ballast tanks) back-and-forth drainage, alternating wet and dry environments, and day-night changes in temperature), the coating film is prone to cracks and causes loss of coating film protection performance
In order to overcome this shortcoming, liquid petroleum resin with plasticizing effect is usually added to the high-solid epoxy coating to improve the toughness of the coating. However, since the liquid petroleum resin exists in the coating film in a free state, it has no relationship with epoxy resin. Chemical bonds will migrate out of the coating film during long-term use, resulting in embrittlement of the coating film
In addition, the polarity of high-solid epoxy coatings is greater than that of traditional epoxy resin coatings, and the wettability of low-surface-treated substrates is not as good as that of traditional epoxy coatings, which may easily cause a decrease in the adhesion of the coating film, resulting in coating Membrane shedding

Method used

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  • High solid constituent epoxy coating composition
  • High solid constituent epoxy coating composition
  • High solid constituent epoxy coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 prepares high solid content epoxy coating composition

[0019] (1) Preparation of component A

[0020] ① Formula

[0021] In every 100 parts by mass of component A, there are 31 parts of resin (wherein flexible epoxy resin accounts for 42%), 57 parts of pigment and filler, 1 part of auxiliary agent, and 11 parts of organic solvent. See Table 1 for details.

[0022] Table 1

[0023]

[0024]

[0025] Note: EPIKOTE874L-X-90 is the product brand of Shell; BYK 104 is the product brand of BYK.

[0026] ② Preparation

[0027] Stir the resin, additives and solvent weighed according to the formula in Table 1 evenly, then add pigments and fillers, mix evenly, and disperse through a disperser to a fineness of 40 microns to obtain component A, which is stored for future use.

[0028] (2) Preparation of component B

[0029] ① Formula

[0030] For every 20 parts by mass of component B, there are 6 parts of polyamide, 3 parts of cashew oil modified amine, 4 p...

Embodiment 2

[0040] Embodiment 2 prepares high solid content epoxy coating composition

[0041] (1) Preparation of component A

[0042] ① Formula

[0043] In every 100 parts by mass of component A, there are 31 parts of resin (wherein flexible epoxy resin accounts for 61%), 57 parts of pigment and filler, 1 part of auxiliary agent, and 11 parts of organic solvent. See Table 3 for details.

[0044] table 3

[0045]

[0046]

[0047] Note: BYK A.T.U is the product brand of BYK company;

[0048] ② Preparation

[0049] Stir the resin, additives and solvents weighed according to the formula in Table 3 evenly, then add pigments and fillers, mix evenly, and disperse through a disperser to a fineness of 40 microns to obtain component A, which is stored for future use.

[0050] (2) Preparation of component B

[0051] ① Formula

[0052] For every 20 parts by mass of component B, there are 7.0 parts of polyamide, 3 parts of cashew oil modified amine, 5 parts of chain extender, and the bal...

Embodiment 3

[0062] Embodiment 3 prepares high solid content epoxy coating composition

[0063] (1) Preparation of component A

[0064] ① Formula

[0065] In every 100 parts by mass of component A, there are 31 parts of resin (wherein flexible epoxy resin accounts for 61%), 57 parts of pigment and filler, 1 part of auxiliary agent, and 11 parts of organic solvent. See Table 5 for details.

[0066] table 5

[0067]

[0068] Note: EPOKUKDO KD-175X90 is the product brand of Guodu Company;

[0069] ② Preparation

[0070] Stir the resin, additives and solvent weighed according to the formula in Table 5 evenly, then add pigments and fillers, mix evenly, and disperse through a disperser to a fineness of 40 microns to obtain component A, which is stored for future use.

[0071] (2) Preparation of component B

[0072] ① Formula

[0073] For every 20 parts by mass of component B, there are 6 parts of polyamide, 4 parts of cashew oil modified amine, 5 parts of chain extender, and the balance...

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Abstract

The invention relates to a high solid constituent epoxy coating composition. The mass ratio of A component to B component is 100:20 in parts. 25-33 parts of resin, 50-60 parts of pigment and padding, 1-3 parts of assistants and the balance of organic solvent are contained in 100 parts of the A components by mass. 6-10 parts of polyamide, 3-5 parts of cashew nut oil modified amine, 3-5 parts of chain extender and the balance of solvent are contained in 20 parts of the B components by mass. The content of volatile organic compound (VOC) of the coating composition is less than or equal to 250g / L. The resin in the A component is a compound of epoxy resin E51, or E 55, or F51 and flexible epoxy resin, and the flexible epoxy resin accounts for 33-66%. 25 DEG C viscosity of the polyamide in the B component is less than 20000mPa.S, and the chain extender is nonylphenol polyether amine containing end primary amine. The combined property of the high solid constituent epoxy coating composition is superior to that of the existing high solid constituent epoxy coating and traditional epoxy anti-corrosion coating.

Description

technical field [0001] The invention relates to a high-solid epoxy coating composition, which belongs to the technical field of coating chemical industry. Background technique [0002] Epoxy coatings based on epoxy resin have good comprehensive mechanical properties, high adhesion, small shrinkage, and excellent corrosion resistance, and are widely used in anti-corrosion in industrial fields, especially in heavy-duty anti-corrosion fields. Traditional epoxy anti-corrosion coatings generally use solid epoxy resin, such as epoxy resin E20 or GY7071. , such as VERSMID 115, its active hydrogen equivalent is 198, and its viscosity at 75°C is 3100-4500mPa.S. The resulting epoxy coatings are widely used due to their excellent adhesion, flexibility, and corrosion resistance. However, this type of coating has a low solids content and a high organic solvent content. When using airless spraying, the volatile organic compound (hereinafter referred to as VOC) content of the paint is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D7/12C09D5/08
Inventor 马胜军沈海鹰王秀娟李敏潘煜怡刘宝成方健君
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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