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Inner paint of metal beverage food can and preparation method and application thereof

A technology for food cans and beverages, applied in anti-corrosion coatings, polyester coatings, lining/internal coatings, etc., which can solve problems such as high cost and multiple processing steps

Active Publication Date: 2015-07-22
清远慧谷新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, in many known coating compositions, because the sheet coating method cannot achieve a film thickness of 10 to 12 gsm in a single coating, the double coating method of first coating the primer composition and then top coating is generally used, which is harmful to For coaters, more processing steps and higher costs are required. At present, epoxy phenolic primer and organic sol topcoat are generally used.

Method used

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  • Inner paint of metal beverage food can and preparation method and application thereof
  • Inner paint of metal beverage food can and preparation method and application thereof
  • Inner paint of metal beverage food can and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Synthesis of Saturated Polyester:

[0066] (1) Put 137.01g of terephthalic acid, 87.03g of isophthalic acid, 60.06g of 1,6-hexanediol and 128.02g of neopentyl glycol into the Add 0.50g of dibutyltin oxide to a 4-necked flask with nitrogen inlet, react at 190°C for 1 hour, and control the temperature of the distillation head not to exceed 102°C;

[0067] (2) Then raise the temperature of the system to 240±3°C to react within 3 hours, and control the temperature of the distillation head to not exceed 102°C; keep warm until the system is transparent and the temperature of the distillation head is at 60°C.

[0068] (3) Cool down to 180°C, add 50.02g of isophthalic acid; then raise the temperature of the system to 230±3°C for 2 hours, keep warm until the system is transparent, keep warm for 1h after being transparent, and remove the fractionation column;

[0069] (4) Replace the fractionation column with a water separator, add 30g of xylene, raise the temperature to 210-215...

Embodiment 2

[0073] Synthesis of Saturated Polyester:

[0074] (1) Put 115.01g of terephthalic acid, 140.00g of isophthalic acid, 60.05g of 1,6-hexanediol and 130.05g of neopentyl glycol into the Add 0.50g of dibutyltin oxide to a 4-necked flask with nitrogen inlet, react at 190°C for 1 hour, and control the temperature of the distillation head not to exceed 102°C;

[0075] (2) Then raise the temperature of the system to 240±3°C to react within 3 hours, and control the temperature of the distillation head to not exceed 102°C; keep warm until the system is transparent and the temperature of the distillation head is at 60°C.

[0076] (3) Cool down to 180°C, add 30.04g of sebacic acid; then raise the temperature of the system to 230±3°C for 2h, keep it warm for 1h, and remove the fractionating column;

[0077] (4) Replace the fractionation column with a water separator, add 30.00g of xylene, raise the temperature to 210-215°C, and keep it under reflux for 2 hours.

[0078] (5) Take a small ...

Embodiment 3

[0081] Synthesis of Saturated Polyester:

[0082] (1) 30.02g of terephthalic acid, 50.00g of isophthalic acid, 41.04g of sebacic acid, 14.42g of 1,4-cyclohexanedimethanol, 74.60g of neopentyl glycol, and 4.00g of trimethylolpropane Add to a 4-necked flask equipped with a stirrer, thermometer, rectifying column, condenser and nitrogen inlet, add 0.20g of dibutyltin oxide, react at 190°C for 1 hour, and control the temperature of the distillation head not to exceed 102°C;

[0083] (2) Then raise the temperature of the system to 240±3°C to react within 3 hours, and control the temperature of the distillation head to not exceed 102°C; keep warm until the system is transparent and the temperature of the distillation head is at 60°C.

[0084] (3) Cool down to 180°C, add 20g of isophthalic acid; then raise the temperature of the system to 230±3°C for 2 hours, keep warm until the system is transparent, continue to keep warm for 1 hour after being transparent, and remove the fractionat...

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Abstract

The invention discloses inner paint of a metal beverage food can, a preparation method and an application thereof. The paint comprises the following components by mass: 35-70% of saturated polyester, 1-15% of amino resin, 3-20% of phenolic resin, and 1.8-2.5% of an additive. The components are mixed to obtain the paint provided by the invention. The paint has the following advantages that: no toxic monomer is contained; a coating prepared by the paint can resist high-temperature sterilization and acid boiling, has very good flexibility, thus can be used as an inner coating of easy-drawing lids, an inner coating of two-sheet deep drawing food cans, and an inner wall coating of three-sheet beverage cans, is suitable for storage of carbonated beverages, beer, sardine, pork luncheon meat, tomato sauce, and the like; the paint realizes a single coating weight of up to 13 g / m2, can replace double coating process by epoxy primer and organosol finish in a sheet coating mode, does not turn white during boiling, has excellent adhesive force, and cause no feather film.

Description

technical field [0001] The invention is used in the field of metal packaging coatings, and in particular relates to a metal beverage and food can interior coating and a preparation method and application thereof. This metal beverage and food can interior coating is free of the following monomers: BPA, BPF, BADGE, BFDGE and PVC. Background technique [0002] Metal packaging has the advantages of high pressure resistance, barrier property, heat sealing property, light shielding property, gas barrier property, etc., and is widely used in the packaging of food and beverage cans. However, due to the activity of the metal, it is easy to be corroded by the contents, especially the acidic or high-salt contents, resulting in corrosion and perforation of food and beverage cans, leakage of the contents or contamination of the contents by metal corrosion products and external foreign matter. It is usually a layer of organic film, which can prevent the content from contacting the metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/02C09D161/32C09D161/06C09D5/08C09D7/12C08G63/20C08G63/183C08G63/181C08G63/78B65D23/02
Inventor 冯志德李国权赵萃红
Owner 清远慧谷新材料技术有限公司
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