US-12623262-B2 - Geogrid prepared by recycling medical waste and preparation method therefor, and use in foundation reinforcement

Abstract

A geogrid prepared by recycling medical waste and a preparation method therefor, and use in foundation reinforcement. The method includes: recycling medical waste for treatment and processing the medical waste into a crushed material; adding modified filler and processing aids, and selecting high-strength fiber bundles for compounding and melting with the crushed material and pressing and stretching to prepare a geogrid. The medical waste is any combination of one or more used medical plastic products and medical plastic products that expire and are not used. The high-strength fiber bundles are more than one bundle of fiber materials commonly used for manufacturing geogrids on the market. The modified filler is a stabilizer for improving the stability of component materials to heat and light. The processing aids are enhancers for improving the performance of the component materials.

Inventors

• Jin Li
• Enzhou DI
• Miaozhang YU
• Shen ZUO
• Peng Jiang
• Xinzhuang CUI

Assignees

• SHANDONG JIAOTONG UNIVERSITY

Dates

Publication Date

20260512

Application Date

20210104

Priority Date

20200410

Claims (16)

1. 1 . A geogrid prepared by recycling medical waste, prepared from the following raw materials: 70 to 90 parts by weight of medical plastic waste, 3.5 to 5 parts by weight of modified filler, 6.5 to 15 parts by weight of processing aids, and 1 to 2 bundles of high-strength fiber bundles.
2. 2 . The geogrid prepared by recycling medical waste according to claim 1 , prepared from the following raw materials: 70 to 80 parts by weight of medical plastic waste, 3.5 to 4 parts by weight of modified filler, 6.5 to 10 parts by weight of processing aids, and 1 to 2 bundles of high-strength fiber bundles.
3. 3 . The geogrid prepared by recycling medical waste according to claim 1 , prepared from the following raw materials: 80 to 90 parts by weight of medical plastic waste, 4 to 5 parts by weight of modified filler, 10 to 15 parts by weight of processing aids, and 1 to 2 bundles of high-strength fiber bundles.
4. 4 . The geogrid prepared by recycling medical waste according to claim 1 , wherein the medical plastic waste is used medical plastic products prepared from raw materials of polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), high-density polyethylene (HDPE), or polyolefin thermoplastic elastomer (TPE) and medical plastic products that expire and are not used.
5. 5 . The geogrid prepared by recycling medical waste according to claim 1 , wherein the high-strength fiber bundle is at least one of carbon fibers, glass fibers, steel-plastic fibers, polyester fibers, or PBO fibers.
6. 6 . The geogrid prepared by recycling medical waste according to claim 1 , wherein the modified filler is a combination of one or more of calcium carbonate or calcium sulfate, sodium polyacrylate thickeners, zinc oxide whiskers or silicon carbide whiskers, short carbon fibers, silica, kaolin or montmorillonite, or talcum powder or mica powder.
7. 7 . The geogrid prepared by recycling medical waste according to claim 1 , wherein the processing aid is a combination of one or more of modified carbon black, paraffin, stearic acid, barium stearate, calcium stearate, or di (2-ethylhexyl) phthalate.
8. 8 . A method for preparing the geogrid according to claim 1 by recycling medical waste, the method comprising: sterilizing and crushing medical waste to form a medical waste crushed material; mixing the medical waste crushed material with modified filler and processing aids and performing melt granulation to form master batches; and melting and compounding the master batches with high-strength fiber bundles, and rolling into a plate, punching, and stretching to obtain a geogrid.
9. 9 . The method for preparing a geogrid by recycling medical waste according to claim 8 , wherein a melting temperature is 160° C. to 200° C.
10. 10 . The method of applying geogrid prepared by recycling medical waste according to claim 1 to reinforce dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards.
11. 11 . The method of applying geogrid prepared by recycling medical waste according to claim 2 to reinforce dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards.
12. 12 . The method of applying geogrid prepared by recycling medical waste according to claim 3 to reinforce dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards.
13. 13 . The method of applying geogrid prepared by recycling medical waste according to claim 4 to reinforce dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards.
14. 14 . The method of applying geogrid prepared by recycling medical waste according to claim 5 to reinforce dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards.
15. 15 . The method of applying geogrid prepared by recycling medical waste according to claim 6 to reinforce dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards.
16. 16 . The method of applying geogrid prepared by recycling medical waste according to claim 7 to reinforce dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards.

Description

TECHNICAL FIELD The present invention relates to the field of civil engineering, and in particular, to a geogrid prepared by recycling medical waste and a preparation method therefor, and use in foundation reinforcement. BACKGROUND Information of the Related Art part is merely disclosed to increase the understanding of the overall background of the present invention, but is not necessarily regarded as acknowledging or suggesting, in any form, that the information constitutes the prior art known to a person of ordinary skill in the art. With the significant development of health care and the increasing number of visits, social medical and health institutions generate a large amount of medical waste every day. Especially when a large-scale epidemic occurs, the severe problem of medical waste disposal needs to be resolved urgently and properly. Medical waste is an important risk factor that causes disease transmission or related public health problems, which has attracted widespread attention. The existing medical waste disposal technologies are mainly incineration, and some medical waste is landfilled after high-temperature steam sterilization and dry chemical sterilization. Failure to meet the disposal technical standards in each step has bad impact on environmental protection. Currently, there are relatively few units that have obtained relevant qualifications, and the disposal capability is limited. Many medical institutions generate a large amount of medical waste every day, and the medical waste is distributed in an extremely scattered way. Disposal units have a long way to collect the medical waste, which is time-consuming and has high costs and many hidden dangers. Much medical waste may not be disposed of in time, causing huge hidden dangers to the health life of the public. Several countries promote centralized harmless disposal of medical waste and encourage the research and development of relevant technologies of safe disposal of medical waste. At present, research has found that polymer materials in plastic products of some recycled medical waste can be used in the manufacture of geogrids after sterilization and reprocessing. However, the inventor found that current geogrids manufactured by medical waste plastics still need to be improved in terms of product performance and manufacturing costs. SUMMARY The present invention is to resolve the problem of difficulty in disposing medical waste, recycle some medical waste through sterilization treatment and reprocessing, and provide a method for preparing a geogrid by recycling medical waste. To achieve the foregoing technical objective, the present invention adopts the following technical solutions: A first aspect of the present invention provides a geogrid prepared by recycling medical waste, prepared from the following raw materials: 70 to 90 parts of medical plastic waste, 3.5 to 5 parts of modified filler, 6.5 to 15 parts of processing aids, and 1 to 2 bundles of high-strength fiber bundles. Through the method in this application, the product performance of geosynthetics is improved, and manufacturing costs are reduced, so that the geogrid prepared by recycling medical waste has many competitive advantages on the market. Compared with the existing method of “reinforcing waste plastics with high-strength fiber materials”, in this application, modified filler such as silicon carbide whiskers or kaolin is added to improve the photothermal stability of a product when master batches are prepared through melting in a particular proportion, and a processing aid such as modified carbon black, paraffin, or calcium stearate is added to improve the aging resistance and oxidation resistance of the product, and the problem of corrosion by acid, alkali, and salt can be resolved, thereby improving the elongation and tensile strength of a material. A second aspect of the present invention provides a method for preparing a geogrid by recycling medical waste, including: sterilizing and crushing medical waste to form a medical waste crushed material; mixing the medical waste crushed material with a particular proportion of modified filler and processing aids and performing melt granulation to form master batches; and melting and compounding the master batches with high-strength fiber bundles, and rolling into a plate, punching, and stretching to obtain a geogrid. A third aspect of the present invention provides use of the foregoing geogrid prepared by recycling medical waste for reinforcement of dikes and subgrades, slope protection, cave wall reinforcement, and reinforcement of permanently loaded foundations for large airports, parking lots, and dock yards. The present invention has the following beneficial effects: (1) The present invention adopts the foregoing technical solutions of preparing a geogrid, to recycle medical plastic waste to prepare a base material, and select and add different fiber materials according to different commercial purposes to prepare a