Degradable film preparation process

A preparation process and technology of degradable film, applied in the field of degradable film preparation process, can solve the problems of uncultivable land, livestock eating by mistake, high production cost, etc., achieve the effects of reducing agglomeration and delamination, improving uniformity and good mechanical properties

Inactive Publication Date: 2021-02-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous growth of film production, it brings convenience to people but also brings serious environmental pollution. For example, agricultural film, as a means of agricultural production, is widely used in modern agriculture, but if the waste agricultural film is not cleaned If it is clean, it will bring great disadvantages to the environment and agricultural production.
Long-term use of the agricultural film left on the land will cause crop yield reduction, land desertification, river blockage, and cause livestock to eat and die, which seriously damages the environment
If the residual film per mu exceeds 22kg, the yield of crops will be reduced by 25%. If the residual film per mu exceeds 50kg, the land will not be cultivated and will lead to desertification
Therefore, the degradable film has been widely used, but the existing degradable film preparation process, some of the process is complicated, the production cost is high, and the degradable film prepared by some has a single property and uneven degradation.

Method used

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preparation example Construction

[0013] (1) Preparation of photodegradable masterbatch: dry the photosensitizer at 25-35°C for 0.5-1h, mix the dried photosensitizer with dispersant, polypropylene resin, antioxidant, hydrophobic agent and lubricant Granulation to obtain photodegradable masterbatch; among them, the drying temperature of the photosensitizer should not be too low, too low for insufficient drying, and not too high, too high will destroy the properties of the photosensitizer, and the photosensitizer and dispersant, polypropylene resin , Antioxidant, Hydrophobic Agent, Lubricant mixed, the dispersant makes the photosensitizer well into the macromolecular chain of polypropylene resin, and can prevent the dispersant, polypropylene resin, antioxidant, Hydrophobic agent, lubricant, etc. The agglomeration improves the uniformity of the substance and improves the uniformity of the degradation of the degraded film.

[0014] The photodegradable masterbatch includes by weight: 0.5-1 part of photosensitizer, ...

Embodiment 1

[0022] A kind of degradable membrane preparation process, comprises the following steps:

[0023] (1) Preparation of photodegradable masterbatch: dry 0.5 parts by weight of benzoin n-butyl ether at 25°C for 1 hour, mix the dried benzoin n-butyl ether with 0.1 parts by weight of polyethylene wax, 0.1 parts by weight of coke Sodium phosphate, 30 parts by weight of polypropylene resin, 0.1 parts by weight of antioxidant 1098, 0.2 parts by weight of acrylamide, and 0.1 parts by weight of stearic acid are mixed and granulated in a twin-screw granulator to obtain photodegradable masterbatches , the granulation conditions are as follows: the temperature is 120°C, the screw speed is 120rpm, and the screw length-to-diameter ratio L / D is 40;

[0024] (2) Preparation of starch-based degradable masterbatch: dry 25 parts by weight of starch at 30°C for 1 hour, mix and stir the dried starch and 0.2 parts by weight of aluminate at 40°C to obtain Starch mixture, then the starch mixture is mi...

Embodiment 2

[0027] A kind of degradable membrane preparation process, comprises the following steps:

[0028] (1) Preparation of photodegradable masterbatch: 1 part by weight of cerium stearate was dried at 35°C for 0.5h, and the dried cerium stearate was mixed with 0.3 parts by weight of polyethylene wax, 0.3 parts by weight of The polypropylene resin of sodium pyrophosphate, 40 parts by weight, the antioxidant 1076 of 0.5 parts by weight, the ammonium thiocyanate of 0.8 parts by weight, the butyl stearate of 0.5 parts by weight are mixed in twin-screw granulator and granulated. To obtain photodegradable masterbatch, the granulation conditions are as follows: temperature is 140°C, screw speed is 130rpm, and screw length-to-diameter ratio L / D is 40;

[0029] (2) Preparation of starch-based degradation masterbatch: 35 parts by weight of starch was dried at 35°C for 0.5h, and the dried starch and 0.6 part by weight of borate were mixed and stirred evenly at 45°C to prepare Obtain the starc...

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Abstract

The invention provides a degradable film preparation process, comprising the following steps: (1) Preparation of photodegradable masterbatch: drying the photosensitizer for 0.5-1h, drying the dried photosensitizer, dispersant, polypropylene resin, antioxidant, Mix and granulate hydrophobic agent and lubricant to prepare photodegradable masterbatch; (2) Preparation of starch-based degradable masterbatch: dry starch for 0.5-1h, mix and stir dried starch and coupling agent evenly to prepare starch mixture, Then mix and granulate the starch mixture with polypropylene resin and plasticizer to obtain starch masterbatch; (3) preparation of degradable film: mix photodegradable masterbatch and starch masterbatch and dry for 0.5-1h, then dry the dried The photodegradable masterbatch and starch masterbatch are kneaded at high speed in a high-speed kneader to obtain a blow molding masterbatch, and the blow molding masterbatch is blow molded to obtain a degradable film. The process is simple and the cost is low, and the prepared degradable film has good mechanical properties, high degradation rate and uniform degradation.

Description

technical field [0001] The invention belongs to the technical field of film materials, and in particular relates to a preparation process of a degradable film. Background technique [0002] Thin films have become indispensable synthetic materials in people's production and life. With the continuous growth of film production, it brings convenience to people but also brings serious environmental pollution. For example, agricultural film, as a means of agricultural production, is widely used in modern agriculture, but if the waste agricultural film is not cleaned If it is not clean, it will bring great disadvantages to the environment and agricultural production. Long-term use of the agricultural film left on the land will cause crop yield reduction, land desertification, river blockage, and cause livestock to eat and die, which seriously damages the environment. If the residual plastic film per mu exceeds 22kg, the yield of crops will be reduced by 25%. If the low residual p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L3/02C08L23/06C08L67/04C08L67/02
CPCC08J5/18C08J2323/12C08J2423/12C08L23/12C08L2201/06C08L2203/16C08L2205/025C08L2205/035C08L3/02C08L23/06C08L67/04C08L67/02
Inventor 李绍才孙海龙陈珂
Owner SICHUAN UNIV
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