Packaging Materials Research--Nanofunctional Packaging Materials

A nano-functional packaging material

From this point of view, the prospects for nano packaging will be boundless. Looking at nano-packaging applications today is nothing more than the following categories.

1. Nano composite packaging material

With the increase in the demand for special functions of packaging in the 21st century, the emergence of such requirements as flood prevention packaging, electromagnetic shielding packaging, camouflage packaging, high-resistance packaging, stealthy packaging, and anti-radar packaging have promoted the development of nano-packaging technology. Nano packaging materials made of nano-materials have become a kind of high-tech materials we need. As far as the packaging field is concerned, in recent years, the most widely studied nanocomposites abroad are polymer-based nanocomposites (PNMC). For example, adding 10% nano TLCP (thermotropic liquid crystal polymer) to a high molecular polymer will increase the tensile strength of the material to 470 MPa, thereby greatly expanding its use and saving scarce resources.

2. Nano antibacterial packaging materials

Nano antibacterial packaging materials have become a hot topic. Japan added a new type of inorganic antibacterial agent to packaging materials and added antibacterial agents and synergists to polyolefin films. At present, the antibacterial film is widely used. Pure natural base materials can play an amazing bactericidal effect in the transformation of nanotechnology. Antibacterial and aseptic packaging can make bacteria cells degenerate or precipitate. Once they encounter water, they will exert greater damage to bacteria. It also has strong adsorption capacity and strong penetration, and it also has strong antibacterial effect after multiple washings.

3. Nano-functional (smart) packaging materials

Nano-functional and smart packaging materials currently developed are usually made of functional materials such as photovoltaic, temperature sensitive, moisture sensitive and packaging materials, which can identify and indicate the temperature, humidity, pressure, and degree of sealing of the packaging space. Some important parameters such as time. This is a kind of functional packaging material with promising development. It can be used to prevent discoloration, rust prevention, mildew proofing, and preservation. It is usually made into functional bags or sheets. Suitable for high-end packaging and military packaging.

4. Nano coating material

(1) Binary synergistic nano-interface materials seek to promote the binary synergies to the nano-interfaces, discuss new interface properties, and super-dual interface physical properties (or super-parent nano-materials). The basic principle is to build on specific surfaces. The nanometer-sized geometry has complementary (such as convex and concave phase) interfacial structure, its concave surface can make the adsorbed gas atoms and molecules stably exist, and has a stable gas film on the macroscopic surface, making oil or water unable to The surface of the material is in direct contact, so that the surface of the material exhibits an extraordinary double hydrophobicity. At this time, the contact angle between the droplet or oil droplet and the interface tends to be maximum. In the field of packaging materials, paper products, cartons, films, etc. have also been given extraordinary super-hydrophobic, ultra-clear effect.

(2) The complete nano-coating material has been applied in the military now, and a new coating is formed by adding a small amount of nano-titanium together with the resin by means of a conventional coating technique, so that its function is upgraded, and corrosion resistance and seawater resistance are achieved. , high temperature, oxidation and aging resistance. Increase the hardness, reduce the friction formed by the self-lubrication, can also produce antibacterial, cleaning effect.

5. Nano adhesives and sealants

Adhesives and sealants are important products in the packaging field and are used in a wide range of applications. Foreign countries have added nano-SiO2 as an additive to adhesives and sealants, which greatly increase the bonding effect of adhesives and the sealability of sealants. The mechanism of action is to coat a layer of organic material on the surface of nano-SiO2. To make it hydrophilic.

6. Nano-substrate packaging materials

The iron plates used in beverage cans have undergone the development of tinplate and tinplate (TFS). At present, the so-called third-generation nano-materials have been developed. In order to improve the welding and sealing performance of TES, the third-generation supersonic has been successfully developed. Micron tin TES plate, nano tin particle diameter is 100nm, tin plating volume 100mg/m2, volume rate <12%, tin volume and dosage are greatly reduced, the new plate is safe and good performance, easy processing and molding, operating parameters range Relaxation, especially the improvement of welding sealability, makes it a high-grade metal can plate. For example, the welding current range is as wide as 300-600A, making it more suitable for making beverage packaging containers.

7. Nano-luminescent materials and security printing

(1) New nano-luminescent materials can emit light in the dark for more than 12-24 hours after a few minutes of illumination, and their luminous intensity and maintaining time are more than 30 times that of traditional fluorescent materials, and the materials themselves are non-toxic and harmless. Does not contain any radioactive elements, and its stability and weather resistance are excellent. Can be used endlessly.

(2) Utilizing new wide-format laser holographic anti-counterfeiting and packaging film materials and manufacturing technology, R&D and industrial production of high-performance anti-counterfeiting and packaging film products suitable for the Chinese market, with great market potential, and moderate equipment costs and investments.

8. Nano Packaging Machinery Parts and Devices

(1) Carbon nanotubes also have a high mechanical strength and a high thermal conductivity, and due to their very large length-to-diameter ratio, it is possible to manufacture any complicated-shaped parts or reinforcing fibers of composite packaging materials.

At present, printing and packaging machinery parts made of inexpensive nano-plastics such as gears, ceramic bearings, nano-ceramic rollers, electric engraving rollers, etc. have entered the enterprises and began to replace metal materials.

(to be continued)