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A kind of preparation method of biodegradable self-sealing strip

A biodegradable, self-sealing technology, applied in biological packaging, closure devices, sustainable manufacturing/processing, etc., can solve the problems of inability to self-sealing by injection molding and different production performance.

Active Publication Date: 2020-12-01
WINTERSUN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Self-sealing strips are composed of self-sealing strips and sealing strip buckles. Different parts require different production performance. Currently, pure PLA material cannot be used for injection molding production of self-sealing strips.

Method used

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  • A kind of preparation method of biodegradable self-sealing strip

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of biodegradable self-sealing strip: according to the mass percentage of PLA: 40%, PBAT: 60%, the mixture is prepared, and the uniform mixture is added to the screw extruder for extrusion molding, and the mixture is plasticized by the extrusion screw. The mold head is formed, and the formed self-sealing strip is obtained after cooling.

[0019] Production process parameters: Extrusion screw and die are at 90 degrees, and the outlet of the die is downward so that the self-sealing strip can directly enter the cooling water tank for cooling when it is extruded. The heating temperature of the extrusion screw: the first-level temperature is 135 degrees; the second-level temperature is 145 degrees; the third-level temperature is 160 degrees; the fourth-level temperature is 165 degrees. , the traction speed is set according to the size of the self-sealing strip, and the traction speed is adjusted so that the section size of the self-sealing strip is 1.9-...

Embodiment 2

[0023] Press the self-sealing strip by hand, adjust the traction speed, so that the self-sealing strip size meets the thickness of 2-2.5mm and the width of 20-22mm.

Embodiment 3

[0025] A heat-insulating and environment-friendly express packaging bag with full degradation in Example 1, including a bag body, the bag body adopts double-layer fabrics: an inner layer of hot-rolled non-woven fabric, an outer layer of coated non-woven fabric, a middle interlayer, and an inner layer of the middle interlayer Filled with thermal insulation fibers, the bag body is made of PLA biodegradable plastic material, and the bag body is sealed with a self-sealing strip. The chain body and self-sealing strip head are made of composite materials of PLA and PBAT.

[0026] The above packaging bags are sequentially made through PLA spinning-thin non-woven fabric manufacturing-non-woven fabric coating-printing-bag making-cotton filling. The specific production steps are as follows

[0027] (1) PLA spinning: In order to prepare PLA fibers, spinning-grade PLA chips are used as raw materials for melt spinning. A screw spinning machine is used. The melting point of PLA is 175 degre...

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Abstract

A preparation method for a biodegradable self-sealing strip, comprising preparing a mixed material according to the following mass percentages: PLA: 20 to 40%, and PBAT: 60 to 80%, adding the uniformly mixed material to a screw extruder for extrusion molding, and subjecting the mixed material to plasticization by means of an extrusion screw, die molding and cooling to obtain a molded self-sealing strip. Compounding PLA and PBAT achieves the production of a fully biodegradable self-sealing product which meets the requirements of use without the addition of any other auxiliaries.

Description

technical field [0001] The invention relates to a preparation method of a self-sealing structure, in particular to a preparation method of a biodegradable self-sealing strip. Background technique [0002] Traditional self-sealing strips and self-sealing strips are made of PP, PE and other materials, which are difficult to be biodegraded in the environment after being discarded, causing pollution. At present, packaging bags made of degradable materials have appeared on the market. Since the bag itself is produced from degradable materials, it can be biodegraded and has a wider range of applications. However, in practical applications, it is often necessary to configure self-sealing strips for the bag body. Or self-sealing strips, etc., in order to achieve full degradation, it is necessary to develop biodegradable self-sealing strip products. [0003] Polylactic acid (PLA) is a novel biodegradable material made from starch raw materials proposed from renewable plant resources...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L67/04B65D33/28
CPCB65D33/28C08L67/02C08L67/04C08L2201/06Y02W90/10
Inventor 缪文球缪广益
Owner WINTERSUN CO LTD
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