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Manufacturing method of PVDC film with crystal point eliminated and barrier property improved

A manufacturing method and thin-film technology, which is applied in the field of PVDC thin-film manufacturing, can solve the problems of film oil leakage, unreported water vapor barrier property, low oxygen barrier property, etc., and achieve the effect of smooth and smooth film surface

Active Publication Date: 2014-07-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention uses at least two or more polymers to prepare a single-layer film by extrusion molding. The oxygen barrier property is not high, and due to the addition of carbonyl-containing polymers such as EVA, it has strong water absorption and is resistant to water vapor. The barrier property will inevitably decrease
U.S. Patent (US4,686,148) discloses a vinylidene chloride copolymer and film manufacturing method, mainly adding a small amount of glycerin (such as less than 2% mass fraction) to the vinylidene chloride copolymer to reduce the amount of other additives, and Attempts to improve the thermal stability and oxygen barrier properties of vinylidene chloride polymers have not been reported, but the water vapor barrier properties and film crystal point have not been reported. Since the addition of glycerin cannot form a homogeneous mixed system with vinylidene chloride copolymers, the blending The resin exists independently as a second phase component, so when the film is in contact with oily food, glycerin is easily extracted, causing the film to appear oily

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step (1). With 1kg of diisononyl cyclohexanedicarboxylate, 0.2kg of mercaptoethyl carboxylate antimony, 0.2kg of stearate, 0.1kg of talcum powder, mechanically stirred at 40°C After 15 hours, a homogeneously mixed additive was obtained;

[0021]Step (2). 30kg of PVDC resin (a copolymer of vinylidene chloride and vinyl chloride, wherein the mass content of vinylidene chloride segment in PVDC resin is 75%, and the weight average molecular weight is 100,000) is added to the screw type In the mixer, turn on the mixer and raise the temperature at a constant speed of 1.0°C / min; when the temperature rises to 50°C, add the additives into the ribbon mixer; Cool down at a constant speed per minute, and discharge the material after cooling to 50°C. The discharged material is a modified PVDC resin; the modified PVDC resin is naturally cooled to room temperature, and placed in a constant temperature environment of 30°C after bagging for 5 days. Obtain cured modified PVDC resin;

...

Embodiment 2

[0024] Step (1). With the epoxy resin EPON828 of 2kg, the di-n-octyl tin dilaurate of 0.2kg, the calcium stearate of 0.4kg, the titanium oxide of 0.2kg, mechanically stir 24 hours at 35 ℃, obtain the homogeneously mixed Auxiliary;

[0025] Step (2). 30kg of PVDC resin (a copolymer of vinylidene chloride and acrylonitrile, wherein the mass content of vinylidene chloride segment in PVDC resin is 80%, and the weight average molecular weight is 110,000) is added to the screw type In the mixer, turn on the mixer and raise the temperature at a constant speed of 0.5°C / min; when the temperature rises to 40°C, add the additives into the ribbon mixer; Cool down at a constant speed per minute, and discharge the material after cooling to 40°C. The discharged material is a modified PVDC resin; the modified PVDC resin is naturally cooled to room temperature, and placed in a constant temperature environment of 20°C after being bagged and matured for 10 days. Obtain cured modified PVDC resin...

Embodiment 3

[0028] Step (1). With the diphenyl octyl phosphate of 1kg, the hydrotalcite of 0.1kg, the sodium stearate of 0.1kg, the calcium carbonate of 0.5kg, mechanically stir 1 hour at 50 ℃, obtain the assistant that mixes homogeneously agent;

[0029] Step (2). 170kg of PVDC resin (copolymer of vinylidene chloride and methyl methacrylate, wherein the mass content of vinylidene chloride segment in PVDC resin is 82%, and the weight average molecular weight is 120,000) is added to In the ribbon mixer, turn on the mixer and raise the temperature at a constant speed of 1.5°C / min; when the temperature rises to 60°C, add the additives to the ribbon mixer; continue stirring and heat up to 90°C, Cool down at a constant speed of 3°C / min, and discharge the material after cooling to 60°C. The discharged material is modified PVDC resin; the modified PVDC resin is naturally cooled to room temperature, and then placed in a bag and aged in a constant temperature environment of 22°C 8 days, obtain th...

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Abstract

The invention relates to a manufacturing method of PVDC film with crystal point eliminated and barrier property improved. According to the invention, an auxiliary agent with a certain proportion is added to a PVDC copolymer; also, a small amount of a thermal stabilizing agent, a lubricant and an inorganic oxide are added to the PVDC copolymer. The formulation of the auxiliary agent is first carried out, and the auxiliary agent and the PVDC resin are blended according to a certain ratio and a certain sequence. The mixture is subject to a blow molding technology by using a single-screw extruder, such that the film is obtained by blowing. According to the invention, a novel plasticizing agent is adopted, and a proportion is optimized, such that a total auxiliary agent addition amount can be reduced. The prepared PVDC film has a flat and smooth surface; and crystal points with sizes lager than 40 micrometers can be eliminated. The film is advantaged in high mechanical strength, and high steam and oxygen barrier properties. The film can be used in the filed of foodstuff packaging or medicine packaging.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a method for manufacturing a PVDC (polyvinylidene chloride) film that eliminates crystal points and improves barrier properties. technical background [0002] Polyvinylidene chloride (PVDC) is a general term for binary or terpolymers of vinylidene chloride (VDC) and other monomers. The copolymerized monomers mainly include vinyl chloride, acrylonitrile, acrylic acid and methacrylate Classes, etc., generally the content of vinylidene chloride units is more than 70%. Due to the high symmetry of the PVDC polymer chain structure, high regularity, high crystallinity, strong polarity, high cohesive energy, and relatively small diffusion coefficient, the film prepared by PVDC has the best water vapor and oxygen resistance at present. Barrier polymer, its barrier performance is 1500 times that of polyethylene, 1000 times that of polypropylene, and 100 times that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/08C08K13/02C08K5/12C08K5/523C08K5/103C08K5/521C08K5/10C08K5/11B29C49/04B29C47/92B29C55/12B29B7/80B29L7/00B29C48/92
CPCB29C47/92B29C48/92B29C48/397B29C2948/92704B29C2948/92923
Inventor 薛立新郭志毅刘富韩金铭王益杜继立朱琦良陈琳燕
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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