Directly-compoundable low-melting-point polyester thin film preparation method for laminated steel

A technology of low-melting point polyester and coated iron, which is applied in the field of polyester film to achieve the effects of non-toxic shedding, high processability, and safe use

Active Publication Date: 2014-04-30
TIANJIN WANHUA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Compared with traditional tinplate printing and coating, the use of polyester film for coated iron has less carbon emissions and is conducive to environmental protection. The cost is 30% lower than that of traditional iron p

Method used

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  • Directly-compoundable low-melting-point polyester thin film preparation method for laminated steel
  • Directly-compoundable low-melting-point polyester thin film preparation method for laminated steel

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Embodiment 1

[0029] 1) Core layer polyester chips: 60-80% of the total mass of HS230 is mixed with 40-20% of the total mass of HS230-A, and the polyester chips after mixing are crystallized and dried: in order to avoid the melt extrusion process Medium PET degradation, crystallization and drying of the core polyester chips, the first crystallization temperature is 80-120°C for 12 hours, the second crystallization temperature is 150°C, the drying temperature is 160°C, and the drying time is not less than 6 hours.

[0030] 2) Surface and bottom polyester chips: 60-80% of the total mass of HS230 is mixed with 40-20% of the total mass of HS230-A, and the surface and bottom layer use twin-screw vacuum pumps to remove moisture.

[0031] 3) Melt extrusion: three-layer co-extrusion, in which the main extruder extrudes the core layer material, and the other two are twin-screw auxiliary extruders with vacuum exhaust function, which respectively extrude the surface layer and the bottom layer material ...

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Abstract

The invention discloses a directly-compoundable low-melting-point polyester thin film preparation method for laminated steel. A core-layer polyester slice is formed by mixing 60 to 80 mass percent of pure polyester slice with a melting point of 180 to 230 DEG C and 40 to 20 mass percent of silicon dioxide additive type polyester slice. In order to avoid the degradation of PET (polyethylene terephthalate) in a melting extrusion process, the core-layer polyester slice is crystallized and dried, wherein primary crystallization is carried out at 80 to 120 DEG C for 12 hours; secondary crystallization is carried out at 150 DEG C; the drying is carried out at 160 DEG C for not less than 6 hours. According to the preparation method, a polyester thin film has the advantages of low melting point, high tensile property, high machinability, resistance to high-temperature cooking, high barrier property, nontoxicity, anti-falling performance and the like, is used as an inner layer and an outer layer of a steel food and medicament can, and can be disinfected and sterilized at high temperature; in addition, the polyester thin film is free of adhesives and chemical solvents, so that safety in use can be ensured.

Description

technical field [0001] The invention belongs to polyester films, in particular to a method for preparing a direct-composite low-melting-point polyester film for coated iron. Background technique [0002] The outer surface of traditional iron cans uses colored paint as the background color to print various exquisite patterns, while the inner surface is all painted with solvent-based paint to achieve anti-corrosion and anti-leakage functions. [0003] First of all, the paint used on the outer surface contains various solvents. During the processing, the solvent emission in the paint pollutes the air, and the paint needs to be dried in an oven during the processing, which consumes a lot of energy. BADGE (bisphenol-A diglycidyl ether) is commonly used as a heat stabilizer and reinforcing agent in interior surface coatings. The hydrogen chloride produced when PVC organosol is baked at high temperature combines with BADGE to form its chloropropanol derivatives. During the high-pr...

Claims

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Application Information

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IPC IPC(8): B32B37/04B32B38/00
Inventor 苏志钢赵富田立斌徐京姬任大鹏
Owner TIANJIN WANHUA CO LTD
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