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Preparation method for three-layer co-extruded composite high barrier blown film

A three-layer co-extrusion, high-barrier technology, applied in the field of preparation of three-layer co-extrusion composite high-barrier blown film, can solve the problems of high melt flow viscosity, difficult forming and processing, narrow processing temperature, etc. The effect of higher decomposition temperature, higher right-angle tear strength, and improved molding processability

Inactive Publication Date: 2015-03-04
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of poor thermal stability, high melt flow viscosity, narrow processing temperature, and difficult forming process in the preparation process of PVDC film, the present invention provides a method for preparing a three-layer co-extruded composite blown film with high barrier properties; Methods Using polyvinylidene chloride (PVDC) as the basic raw material, adding metallocene linear low density polyethylene (m-LLDPE), ethylene-octene block copolymer (OBC), tributyl citrate, rare earth calcium zinc Composite stabilizer, butyl stearate, high barrier blown film made by three-layer co-extrusion blow molding process; the interlayer of the prepared film is made of polyvinylidene chloride (PVDC), tributyl citrate, Composed of rare earth calcium-zinc composite stabilizer and butyl stearate blended and plasticized, the surface layer of the film is blended and plasticized by metallocene linear low density polyethylene (m-LLDPE) and ethylene-octene block copolymer (OBC) composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The melt flow rate is 3.4g / 10min, the density is 0.917g / cm 3 m-LLDPE 80kg, melt flow rate 4.5g / 10min, density 0.887g / cm 3 Put 20kg of OBC in the mixer, control the mixer speed to 250r / min, the temperature is 80°C, after mixing the materials for 5 minutes, place the same amount in 1 of the three-layer co-extrusion blow molding unit # 、3 # In the hopper of the surface extruder; the mass fraction of vinylidene chloride is 77 kg of PVDC of 68%, the acidity is 0.016%, the viscosity is 12 kg of tributyl citrate of 31.9 centipoise, the mass fraction of lanthanum oxide is 15%, hard Calcium fatty acid mass fraction is 45%, zinc stearate mass fraction is 2 ㎏ of rare earth calcium zinc composite stabilizer and butyl stearate 1 ㎏ of 40% to be placed in another blender, control blender speed 250r / min, The temperature is 95°C, and the materials are mixed for 15 minutes and placed in the 2-stage of the three-layer co-extrusion blow molding unit. # Intermediate interlayer extruder h...

Embodiment 2

[0022] The melt flow rate is 3.4g / 10min, the density is 0.917g / cm 3 m-LLDPE 88㎏, melt flow rate 4.5g / 10min, density 0.887g / cm 3 Put 12kg of OBC in the mixer, control the mixer speed to 250r / min, the temperature is 79°C, after mixing the materials for 5 minutes, place the same amount in 1 of the three-layer co-extrusion blow molding unit # 、3 #In the hopper of the surface extruder; the mass fraction of vinylidene chloride is 85 kg of PVDC of 68%, the acidity is 0.016%, the viscosity is 18 kg of tributyl citrate of 31.9 centipoise, the mass fraction of lanthanum oxide is 15%, hard The mass fraction of calcium stearate is 45%, the mass fraction of zinc stearate is 40% rare earth calcium-zinc composite stabilizer 3㎏ and butyl stearate 2㎏ are placed in another blender, control the blender speed 250r / min, The temperature is 96°C, and the materials are mixed for 15 minutes and placed in the 2-stage of the three-layer co-extrusion blow molding unit. # Intermediate interlayer extrud...

Embodiment 3

[0025] The melt flow rate is 3.4g / 10min, the density is 0.917g / cm 3 m-LLDPE 84㎏, melt flow rate 4.5g / 10min, density 0.887g / cm 3 Put 16kg of OBC in the mixer, control the mixer speed 250r / min, temperature 81 ℃, mix the materials for 5 minutes and place the same amount in 1 of the three-layer co-extrusion blow molding unit # 、3 # In the hopper of the surface extruder; the mass fraction of vinylidene chloride is 81 kg of PVDC of 68%, the acidity is 0.016%, the viscosity is 15 kg of tributyl citrate of 31.9 centipoise, the mass fraction of lanthanum oxide is 15%, hard The mass fraction of calcium stearate is 45%, the mass fraction of zinc stearate is 2.5 kg of rare earth calcium-zinc composite stabilizer and 1.5 kg of butyl stearate are placed in another mixer, and the control mixer speed is 250r / min. The temperature is 94°C, and the materials are mixed for 15 minutes and placed in the 2-stage of the three-layer co-extrusion blow molding unit. # Intermediate interlayer extruder...

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Abstract

The invention relates to a preparation method for a three-layer co-extruded composite high barrier blown film. The method includes: taking polyvinylidene chloride as the basic raw material, adding metallocene linear low density polyethylene, an ethylene-octene block copolymer, tributyl citrate, a rare earth calcium zinc composite stabilizer and butyl stearate, and carrying out a three-layer coextrusion blow molding process so as to obtain the film. The formula of the film surface layer involves: 80-88 parts by weight of metallocene linear low density polyethylene and 12-20 parts by weight of the ethylene-octene block copolymer. The interlayer comprises: 77-85 parts by weight of polyvinylidene chloride, 12-18 parts by weight of tributyl citrate, 2-3 parts by weight of the rare earth calcium zinc composite stabilizer, and 1-2 parts by weight of butyl stearate. The film prepared by the method provided by the invention has excellent oxygen obstruction and aqueous vapor permeation performance, good physical and mechanical properties and sanitation properties, and is suitable for packaging of cooked food, oily food, chilled fresh meat, dairy products, tea and drugs, etc.

Description

technical field [0001] The invention relates to a preparation method of a functional plastic film, in particular to a preparation method of a three-layer co-extruded composite blown film with high barrier properties. Background technique [0002] Polyvinylidene chloride (PVDC) has excellent barrier properties for oxygen, water vapor and odor transmission. According to reports, PVDC's oxygen barrier performance is equivalent to 1700 times that of LDPE, 1000 times that of PP, 20 times that of PET, and 10 times that of PA; the performance of PVDC on water vapor barrier is equivalent to 190 times that of PA, 30 times that of EVOH, and 20 times; PVDC's odor barrier performance is equivalent to 1000 times that of EVOH, 500 times that of PA, and 17000 times that of PE and PP. In addition, PVDC's oxygen barrier performance is not affected by ambient humidity, and it has obvious advantages compared with PA, EVOH, and PVA. After testing, the hygienic performance of PVDC meets the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/28C08L23/08C08L53/00C08L27/08C08K5/11C08K5/101
Inventor 张华集肖荔人张雯陈晓
Owner FUJIAN NORMAL UNIV
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