Preparation method of polyester modified epoxy resin for household electroplate primer

A technology for modification of epoxy resin and polyester, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor flexibility, adhesion, poor MEK resistance and salt spray resistance, and primers that cannot meet the requirements of home appliance boards Requirements and other issues, to achieve the effect of improving performance, improving interlayer adhesion, and excellent salt spray resistance

Active Publication Date: 2012-01-25
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

There are usually two types of resin systems used in traditional building board primers, one is epoxy resin system, which has excellent adhesion and salt spray resistance, but poor flexibility; the other is polyester resin system , the polyester resins in this system are mostly medium molecular weight, with good flexibility, but poor adhesion, MEK (methyl ethyl ketone) resistance and salt spray resistance
The primers formulated with these two resin systems cannot meet the requirements of home appliance panels

Method used

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  • Preparation method of polyester modified epoxy resin for household electroplate primer
  • Preparation method of polyester modified epoxy resin for household electroplate primer
  • Preparation method of polyester modified epoxy resin for household electroplate primer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 prepares polyester resin 1#

[0031] (A) The raw material formula is shown in Table 1

[0032] Table 1

[0033]

[0034]

[0035]Note: The amount of dibasic alcohol and dibasic acid in the formula is based on the amount of carboxyl substances and hydroxyl substances contained in it. 1 mole of carboxyl uses 1.50 moles of hydroxyl. Among them, the amount of diethylene glycol and ethyl butyl propylene glycol The ratio is 1:1; the molar ratio of terephthalic acid to adipic acid is 2:1.

[0036] (B) specific operation

[0037] Put the dibasic alcohol, dibasic acid, catalyst and solvent xylene in the clean reaction bottle. After the materials are melted, start stirring and pass inert gas at the same time. The material is heated slowly at a rate of 10°C / h, kept at 200°C for 1 to 2 hours, then slowly raised to 220°C and kept for reaction until the measured acid value is less than 2mgKOH / g, then vacuumed for 0.5h to remove small molecule alcohols. Cool dow...

Embodiment 2

[0038] Embodiment 2 prepares polyester resin 2#

[0039] (A) The raw material formula is shown in Table 2

[0040] Table 2

[0041]

[0042] Note: The amount of dibasic alcohol and dibasic acid in the formula is calculated as 1.20 moles of hydroxyl for 1 mole of carboxyl group according to the amount of carboxyl substance and hydroxyl substance contained in it. Among them, the ratio of the amount of methylpropanediol to neopentyl glycol 6:1; the molar ratio of isophthalic acid to adipic acid is 5:1.

[0043] (B) specific operation

[0044] According to the formula of table 2 and the operation gained filtrate of embodiment 1 is hydroxyl-terminated linear polyester resin, referred to as polyester resin 2#, its hydroxyl equivalent is 600 (equivalent hydroxyl value 93.5mgKOH / g), relative number average molecular weight The mass is 1200, the solid content is 70% (mass), and it is preserved for future use.

Embodiment 3

[0045] Embodiment 3 prepares polyester resin 3#,

[0046] (A) The raw material formula is shown in Table 3

[0047] table 3

[0048]

[0049] Note: The amount of dibasic alcohols and dibasic acids in the formula is based on the amount of carboxyl substances and hydroxyl substances contained in them. 1 mole of carboxyl uses 1.07 moles of hydroxyl. Among them, the ratio of ethylene glycol and 1,6 hexanediol The molar ratio is 2:1; the molar ratio of isophthalic acid to adipic acid is 3:1.

[0050] (B) specific operation

[0051] According to the formula of table 3 and the operation gained filtrate of embodiment 1 is hydroxyl-terminated linear polyester resin, referred to as polyester resin 3#, its hydroxyl equivalent is 1450 (equivalent hydroxyl value 38.7mgKOH / g), relative number average molecular weight The mass is 2900, the solid content is 60% (mass), and it is preserved for future use.

[0052] (2) Preparation of polyester modified epoxy resin

[0053] It is impleme...

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Abstract

The invention relates to a preparation method of polyester modified epoxy resin for a household electroplate primer. The preparation method of the polyester modified epoxy resin comprises the following steps of: grafting polyester resin to epoxy resin by using diisocyanate; and performing ring opening on part of epoxy groups by using alcohol amine. In the method, the used polyester resin is terminal hydroxy group linear polyester resin, and the used epoxy resin is bisphenol A type epoxy resin having at least two secondary hydroxyls. The preparation method ensures that the prepared polyester modified epoxy resin simultaneously contains a urethane band, an ester bond, a primary hydroxyl, the secondary hydroxyls and epoxy groups, so the polyester modified epoxy resin integrates the advantages of existing polyester resin and epoxy resin, and simultaneously gets rid of the disadvantages of the existing polyester resin and epoxy resin, has excellent flexibility, adhesive power and antiseptic properties, and compared with the conventional epoxy primer and polyester primer, the household electroplate primer prepared from the polyester modified epoxy resin has more excellent comprehensive performance.

Description

technical field [0001] The invention relates to a preparation method of polyester-modified epoxy resin used for home appliance board primer. Background technique [0002] With the continuous development of the domestic economy, pre-coated panels have developed rapidly, especially pre-coated panels (referred to as construction panels) commonly used in the construction industry. As a high-tech field of pre-coated color boards, the market for pre-coated boards (referred to as home appliance boards) for household appliances has also developed well in recent years. In order to meet its development needs, the supporting series of coatings for home appliance panels (including primers, topcoats, and backcoats) need to have mature and mature products. Compared with traditional building panels, home appliance boards have higher requirements on performance, for example, they need to have better flexibility (some parts of some home appliances need to be folded in half, that is, 0T); be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/83C08G18/78C08G18/58C08G63/672C08G63/181C08G63/91C09D175/04
Inventor 冯春苗吴奎录李大鸣王利群
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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