PVC food packaging composition and preparation method thereof

A technology for food packaging and composition, applied in the application field of polymer materials, can solve the problems of low strength and precipitation of liquid plasticizer, and achieve the effects of high tensile strength, good flow performance and high mechanical performance

Active Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent also uses a liquid plasticizer, which has problems such as low strength and precipitation of the liquid plasticizer.

Method used

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  • PVC food packaging composition and preparation method thereof

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Embodiment

[0027] The preparation method of embodiment is:

[0028] 1) Mixing of raw materials: first put polyvinyl chloride resin, calcium / zinc stabilizer, phosphite, and lubricant into a high-speed mixer and mix them. When the mixing temperature reaches 100~120°C, transfer the materials to a low-speed mixer When cooling to 35~45°C, add polycaprolactone and compatibility modifier, and continue mixing for 2 to 3 minutes to obtain a compound;

[0029] 2) The compounded material is granulated by a parallel twin-screw extruder or a conical twin-screw extruder. The process parameters of the twin-screw extruder are set as: 1 zone 100°C, 2 zone 120°C, 3 zone 145°C, 140°C in zone 4, 130°C in the machine head.

[0030] The preparation method of the comparative example is as follows: all the materials are mixed in a high-speed mixer at the same time, and the rest of the process is the same as that of the embodiment.

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Abstract

The invention discloses a PVC food packaging composition and a preparation method thereof, and belongs to the field of high molecular material application. The PVC food packaging composition is characterized by being composed of, by weight, 100 parts of polyvinyl chloride resin, 60-70 parts of polycaprolactone, 0.5-1.5 parts of calcium / zinc stabilizers, 3-10 parts of compatible modifiers, 0.5-1.5 parts of lubricating agents and 0.5-2 parts of phosphite ester; and copolymer of ethylene-vinyl acetate and carbon oxide serves as the compatible modifiers. In the preparation process, the polyvinyl chloride resin, the calcium / zinc stabilizers, the phosphite ester and the lubricating agents are mixed at high temperature at first, the polycaprolactone and the compatible modifiers are added after cooling, a mixture is continued to be mixed evenly, and a double-screw extrusion machine is used for pelleting. Low molecular weight pure biopolyester is selected for replacing existing liquid plasticizers, copolymer resin of the ethylene-vinyl acetate and the carbon oxide is used for synergistic modification in a matched mode, and harm to human bodies due to the liquid plasticizers comprising benzene rings and precipitation of the benzene rings is avoided.

Description

technical field [0001] A PVC food packaging composition and a preparation method thereof belong to the application field of polymer materials. Background technique [0002] PVC is commonly used in food packaging, medical and other products because of its cheap price, wide adaptability, large output, and polyvinyl chloride materials themselves have good physical properties. When PVC is used in soft products, plasticizer must be added. The function of adding plasticizer is to make PVC soft and easy to process. At present, most of the plasticizers used in medical materials and food packaging materials are no longer dioctyl phthalate (DOP), which has hidden dangers to human health and has been banned by the European Union. Instead, they use non-toxic and environmentally friendly plasticizers. Plasticizers, such as di-isooctyl cyclohexanedicarboxylate (DEHCH), etc. Although plasticizers such as DEHCH have opened the benzene ring, there are still more or less components that are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L67/04C08L23/08C08K5/098C08K5/524
Inventor 刘容德张新华李静刘浩张桦桂俊杰王晓敏孙培培
Owner CHINA PETROLEUM & CHEM CORP
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