A kind of can can inner coating paint and preparation method thereof

A coating and polyester technology, which is applied in the field of can inner coating and its preparation, can solve the problems of general discount, staying in physical mixing, difficult to cure film layer, etc.

Active Publication Date: 2020-05-19
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 performance of the coating. However, the current formulation design in the industry is still limited to simple physical mixing. The polyester does not react with the second component during the curing process, and it is difficult to form a uniform coating. Curing the film layer, its formula design is time-consuming and laborious, and its versatility is greatly reduced

Method used

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  • A kind of can can inner coating paint and preparation method thereof
  • A kind of can can inner coating paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, the preparation of polyester:

[0032] Put 52 kg of neopentyl glycol, 63 kg of ethylene glycol, 112 kg of terephthalic acid, 33 kg of isophthalic acid, 21 kg of sebacic acid, and 100 g of tetrabutyl titanate into the reactor. Replace the exhaust air with nitrogen, stir and raise the temperature to 220~240℃ to react. The acid value is less than 30mg KOH / g as the end point. After the reaction is over, the temperature is raised to 240~260℃, and the polycondensation is stirred for 30 minutes under vacuum conditions. 5kg of trimellitic anhydride is added, and stirring is continued until the predetermined viscosity is reached. Discharge.

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

[0034] Stir and dissolve the resin in 150kg of 150# solvent, add 2kg of aziridine and keep for 30min. Add 50kg of phenolic resin (Cytec PR612) a...

Embodiment 2

[0036] First, the preparation of polyester:

[0037] 62 kg of neopentyl glycol, 55 kg of ethylene glycol, 99 kg of terephthalic acid, 51 kg of isophthalic acid, 18 kg of sebacic acid, and 120 g of tetrabutyl titanate were put into the reactor. Replace the exhaust air with nitrogen, stir and raise the temperature to 220~240℃ to react. The acid value is less than 30mg KOH / g as the end point. After the reaction is over, the temperature is raised to 240~260℃, and the polycondensation is stirred for 30 minutes under vacuum conditions. 3kg of pyromellitic anhydride is added, and stirring is continued until the predetermined viscosity is reached. Vacuum, extrusion and discharge.

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

[0039] Stir and dissolve the resin in 100 kg of DBE solvent, add 3.5 kg of propylene imine, and hold for 30 min. Add 5...

Embodiment 3

[0041] First, the preparation of polyester:

[0042] 72 kg of neopentyl glycol, 49 kg of ethylene glycol, 83 kg of terephthalic acid, 49.8 kg of isophthalic acid, 40.4 kg of sebacic acid, and 90 g of tetrabutyl titanate were put into the reactor. Replace the exhaust air with nitrogen, stir and raise the temperature to 220~240℃ to react. The acid value is less than 30mg KOH / g as the end point. After the reaction is over, the temperature is raised to 240~260℃, and the polycondensation is stirred for 30 minutes under vacuum conditions. 4kg of pyromellitic anhydride is added, and stirring is continued until the predetermined viscosity is reached. Vacuum, extrusion and discharge.

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

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

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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 specifically relates to a coating for inner coating of cans and a preparation method thereof. Background technique [0002] The inner coating of cans, especially the inner coating materials of food cans, due to the increasingly stringent requirements for environmental protection, the compatibility of polyester resin and amino curing agent is commonly used. [0003] The compatibility method has the following advantages: 1. Excellent flexibility, easy to process and post-treatment; 2. Good adhesion to metal; 3. Full and bright, smooth and stain resistant. Especially in the context of the current restrictions on bisphenol A (BPA) substances, the previous epoxy resin-based internal coating production lines have generally been transformed into polyester-amino formulations. [0004] However, polyester is a condensate of polybasic acid and polyhydric alcohol, and its structure determines its resistance to h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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