Interior coating for can and preparation method of interior coating

A technology of coating and polyester, which is applied in the field of can coating coating and its preparation, which can solve the problems of general discount, difficult to cure film layer, time-consuming and laborious formulation design, etc.

Active Publication Date: 2017-11-24
中瀚新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the general consensus in the industry is to introduce the second component to form a polyester compound as a film-forming formula, including polyester/epoxy system, polyester/polyacrylate, polyester/phenolic and other solutions. The second group The characteristics of the component and the polyester complement each other to improve the overall per...

Method used

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  • Interior coating for can and preparation method of interior coating
  • Interior coating for can and preparation method of interior coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, carry out the preparation of polyester:

[0032] Put 52kg of neopentyl glycol, 63kg of ethylene glycol, 112kg of terephthalic acid, 33kg of isophthalic acid, 21kg of sebacic acid, and 100g of tetrabutyl titanate into the reaction kettle. Replace the air with nitrogen, stir and raise the temperature to 220~240°C for reaction. The acid value is less than 30mg KOH / g as the end point. After the reaction is over, raise the temperature to 240~260°C, polycondensate and stir for 30 minutes under vacuum conditions, add 5kg of trimellitic anhydride, continue stirring, and after reaching the predetermined viscosity, fill it with nitrogen to eliminate the vacuum, and extrude Discharge.

[0033] The obtained polyester had an intrinsic viscosity I.V. of 0.36, a glass transition temperature Tg of 45°C, an acid value A.V. of 20 mgKOH / g, and a hydroxyl value OH.V. of 12 mgKOH / g.

[0034] Stir to dissolve the resin in 150kg of 150# solvent, add 2kg of aziridine, and keep f...

Embodiment 2

[0036] First, carry out the preparation of polyester:

[0037] Put 62kg of neopentyl glycol, 55kg of ethylene glycol, 99kg of terephthalic acid, 51kg of isophthalic acid, 18kg of sebacic acid, and 120g of tetrabutyl titanate into the reaction kettle. Replace the air with nitrogen, stir and raise the temperature to 220~240°C for reaction. The acid value is less than 30mg KOH / g as the end point. After the reaction is over, raise the temperature to 240~260°C, polycondensate and stir for 30 minutes under vacuum conditions, add 3kg of pyromellitic anhydride, continue stirring, and after reaching the predetermined viscosity, fill it with nitrogen to eliminate Vacuum, extrude and discharge.

[0038] The obtained polyester had an intrinsic viscosity I.V. of 0.42, a glass transition temperature Tg of 50°C, an acid value A.V. of 35 mgKOH / g, and a hydroxyl value OH.V. of 8 mgKOH / g.

[0039] Stir to dissolve the resin in 100kg of DBE solvent, add 3.5kg of propyleneimine, and keep ...

Embodiment 3

[0041] First, carry out the preparation of polyester:

[0042] Put 72kg of neopentyl glycol, 49kg of ethylene glycol, 83kg of terephthalic acid, 49.8kg of isophthalic acid, 40.4kg of sebacic acid, and 90g of tetrabutyl titanate into the reaction kettle. Replace the air with nitrogen, stir and raise the temperature to 220~240°C for reaction. The acid value is less than 30mg KOH / g as the end point. After the reaction is over, heat up to 240~260°C, polycondensate and stir for 30 minutes under vacuum conditions, add 4kg of pyromellitic anhydride, continue stirring, and fill nitrogen to eliminate Vacuum, extrude and discharge.

[0043] The obtained polyester had an intrinsic viscosity I.V. of 0.3, a glass transition temperature Tg of 40°C, an acid value A.V. of 40 mgKOH / g, and a hydroxyl value OH.V. of 20 mgKOH / g.

[0044] Stir to dissolve the resin in 200kg of DBE solvent, add 5kg of aziridine, and keep for 30min. Add 70kg of phenolic resin (Cytec PR565) and 30kg of amino...

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Abstract

The invention provides a preparation method of a can. The preparation method comprises the following steps: firstly, synthesizing terminal carboxyl polyester by a body melting method, and then modifying the polyester by using an ethylene imine modifier; secondly, adding phenolic resin, amino resin and an assistant into the modified polyester, and uniformly stirring to form the required coating. According to the preparation method disclosed by the invention, ethylene imine is added, and carboxyl and the ethylene imine are enabled to generate a ring-opening reaction; a terminal carboxyl is introduced into a polyester structure, and high-activity amino can participate in cured cross-linking of phenolic resin at lower temperature by Mannich reaction, so that a homogenous cross-linked reticular structure can be formed. According to the method, a design idea of a traditional polyester composite coating is completely changed; the polyester is modified and is further jointly cross-linked in a system, so that the polyester and a second component can be cured to form the homogenous reticular structure. The performance of a polyester/phenolic curing system is improved, and the generality of a formula is also improved; meanwhile, curing conditions of the polyester/phenolic curing system are milder compared with those of ordinary phenolic, so that energy sources are saved, and easiness in construction is realized.

Description

technical field [0001] The invention belongs to the field of polymer synthesis, and in particular relates to a paint for inner coating of cans and a preparation method thereof. Background technique [0002] The interior coating of cans, especially the interior coating materials of food cans, due to the increasingly stringent requirements for environmental protection, the compatibility method of polyester resin and amino curing agent is commonly used at present. [0003] This compatibility method has the following advantages: 1. Excellent flexibility, easy to process and post-treatment; 2. Good adhesion to metal; 3. Fullness and brightness, smooth and strong stain resistance. Especially in the context of the current restrictions on bisphenol A (BPA) substances, the previous epoxy resin-based interior coating production lines are generally transformed into polyester-amino formulations. [0004] However, polyester is a condensation product of polybasic acid and polyol, and its...

Claims

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Application Information

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IPC IPC(8): C09D167/02C09D161/06C09D161/20C08G63/91
CPCC08G63/916C08L2205/03C09D167/02C08L61/06C08L61/20
Inventor 杜璞黄聪聪黄志远宁珅
Owner 中瀚新材料科技有限公司
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