Preparation method of polypropylene film layer for eliminating stress residues

A polypropylene film and stress relief technology, applied in the field of polypropylene film preparation, can solve problems such as deformation and cracking, deterioration of optical properties, decline in mechanical properties, etc., to eliminate internal stress, eliminate residual stress, and improve strength and toughness Effect

Inactive Publication Date: 2021-02-02
GUANGDONG ANDELI NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven plasticization of the composite film layer during the molding process or the different cooling speeds in the mold cavity, the product often has internal stress, and the product with internal stress often suffers from mechanical properties during storage and use. Deterioration of optical performance, even deformation and cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 of the present invention discloses a method for preparing a polypropylene film layer that eliminates stress residues, and the adopted technical scheme is as follows:

[0027] The components by weight of the polypropylene film layer consist of: polypropylene resin: 80 parts, polypropylene film scrap: 10 parts, polytetrafluoroethylene resin: 0.8 part, plasticizer: 0.5 part, antioxidant: 0.8 part, Lubricant: 0.8 parts.

[0028] S1, crush the scraps of polypropylene film into particles with a particle size of ≤1cm, add polypropylene resin and plasticizer to a dryer for drying, set the temperature at 100-105°C, and dry for 6-7 hours;

[0029] S2, weigh the above mixture and put it into a high mixer, add polytetrafluoroethylene resin, antioxidant, lubricant and stir and mix, set the temperature at 60°C, set the speed at 110rpm, and mix evenly for 5 minutes;

[0030] S3, put the mixture obtained in step S2 into a twin-screw extruder, set the melting and plasticiz...

Embodiment 2

[0035] Embodiment 2 of the present invention discloses a method for preparing a polypropylene film layer that eliminates stress residues, and the adopted technical scheme is as follows:

[0036] The components by weight of the polypropylene film layer consist of: polypropylene resin: 95 parts, polypropylene film scraps: 15 parts, polytetrafluoroethylene resin: 1.2 parts, plasticizer: 1.5 parts, antioxidant: 1.3 parts, Lubricant: 1.3 parts.

[0037] S1, crush the scraps of polypropylene film into particles with a particle size of ≤1cm, add polypropylene resin and plasticizer to a dryer for drying, set the temperature at 100-105°C, and dry for 6-7 hours;

[0038] S2, weigh the above mixture and put it into a high mixer, add polytetrafluoroethylene resin, antioxidant, lubricant and stir and mix, set the temperature at 80°C, set the speed at 120rpm, and mix evenly for 4 minutes;

[0039] S3, put the mixture obtained in step S2 into a twin-screw extruder, set the melting and plast...

Embodiment 3

[0044] Embodiment 3 of the present invention discloses a method for preparing a polypropylene film layer that eliminates stress residues, and the adopted technical scheme is as follows:

[0045] The components by weight of the polypropylene film layer consist of: polypropylene resin: 86 parts, polypropylene film scraps: 12 parts, polytetrafluoroethylene resin: 0.9 part, plasticizer: 0.7 part, antioxidant: 0.9 part, Lubricant: 0.9 parts.

[0046]S1, crush the scraps of polypropylene film into particles with a particle size of ≤1cm, add polypropylene resin and plasticizer to a dryer for drying, set the temperature at 100-105°C, and dry for 6-7 hours;

[0047] S2, weigh the above mixture and put it into a high mixer, add polytetrafluoroethylene resin, antioxidant, lubricant and stir and mix, set the temperature at 65°C, set the speed at 113rpm, and mix evenly for 4 minutes;

[0048] S3, put the mixture obtained in step S2 into a twin-screw extruder, set the melting and plasticiz...

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Abstract

The invention discloses a preparation method of a polypropylene film layer for eliminating stress residues. The method comprises the following steps: S1, pulverizing polypropylene film leftover materials, adding polypropylene resin and a plasticizer, and drying; S2, putting the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, and uniformly stirring; S3, extruding the mixture to form a cast sheet; S4, carrying out cooling shaping and two-way stretching; S5, annealing, drying, and carrying out edge cutting; and S6, performing double-sided corona treatment, rolling, and cutting to obtain a finished product. According to the invention, the internal stress of the polypropylene film layer is eliminated through annealing treatment, the strength and toughness of the polypropylene film layer can be improved, and waste polypropylene film leftover materials are recycled.

Description

technical field [0001] The invention relates to the field of polymer material polypropylene film preparation, in particular to a method for preparing a polypropylene film layer for eliminating stress residue. Background technique [0002] Polypropylene PP is a polymer formed by the addition polymerization of propylene, an organic compound. It is a white waxy material with a transparent and light appearance. The chemical formula is (C3H6)x, the density is 0.89~0.91g / cm3, it is flammable, its melting point is 165°C, it softens at about 155°C, and its operating temperature range is -30~140°C. It can resist the corrosion of acid, alkali, salt solution and various organic solvents below 80 ° C, and can decompose under high temperature and oxidation. Polypropylene is widely used in the production of clothing, blankets and other fiber products, medical equipment, automobiles, bicycles, parts, pipelines, chemical containers, etc., and is also used in food and drug packaging. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00C08J7/12C08J5/18C08L23/12C08L27/18
CPCC08J7/08C08J7/123C08J5/18C08J2323/12C08J2423/12C08J2427/18
Inventor 吴安理陈汉城王桂彬林杰生
Owner GUANGDONG ANDELI NEW MATERIALS CO LTD
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