Research on the application of the hottest nanotec

2022-10-18
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Research on the application of nanotechnology in packaging and printing

I. overview of nanotechnology

nanometer (nm) is a unit of length for measuring substances, which is m, expressed as nm with symbols. Nano is equal to one billionth of a meter and one thousandth of a micron, which is about 34 times the width. From micron technology to nanotechnology is the inevitable result of scientific development, but it is not a simple extension. In the measurement unit between 0.1 nm and 100 nm, the physical and structural properties of matter have changed from quantitative to qualitative. Nanoscience is a technology based on this micro measurement in the late 1980s

nanotechnology is a term with extremely rich meanings, and it also contains rich philosophical connotations. Its basic meaning is to understand and transform nature in the scale space of nanometer size (10-10-10-7m), and to study the creation of new substances through direct operation and arrangement of atomic and molecular motions and properties

II. Brief history of the development of nano packaging materials

the history of artificial preparation of nano materials can be traced back to at least 1000 years ago. Our ancestors should have a history of manufacturing and using nano materials. For example, in ancient China, the smoke from burning candles was used to make carbon black light raw materials, and the dye used for coloring the heart was the earliest nano material

in 1990, the 7utm experimental machine included one or more vertically loaded columns. The first international academic conference on nanoscience and technology was held in Baltimore, USA. in 1993, the International Commission on Nanotechnology (INIC) divided nanoscience and technology into six branches: Nanophysics, nanobiology, nano chemistry, Nano Electronics, nano processing, and nano metrology, It marks the birth of these branches as relatively independent disciplines. Since then, this kind of nanotechnology research between atoms, molecules and macro matter has become a hot spot in the world science and technology

Luo Yi is the most famous material expert at the end of the 20th century. His nano theory created a new era of nano packaging materials - Nano. Under the guidance of nano theory, Japan first developed nano composite packaging materials in 1990, and their packaging applications are just around the corner. Undoubtedly, through nanotechnology, we can develop nano packaging systems. Entering nano scale and making various types of additives in micron scale into nano scale products will replace the traditional packaging and printing products

there are three kinds of research fields with the strongest function in nanotechnology: 1 nanometer material; 2. Nano devices; 3. Nano detection and characterization. Looking at the research results of nanotechnology in the world, there are two important findings: 1. We can make materials into nanostructures to obtain new properties; 2. There are a wide range of disciplines that contribute to the development of nanotechnology, and many new activities are at the intersection of various disciplines

third, the four effects of nanostructures and nano materials

nanostructures are based on nano scale material units, and build or create a new system according to certain laws, including one-dimensional, two-dimensional and three-dimensional systems

nano material generally refers to particles with a size between 1-100nm. It is a typical mesoscopic system located in the transition region between atomic clusters and macro objects. After ordinary materials are made into nano scale, nano materials have the third special functions of light, sound, electricity, heat, magnetism, projection, absorption and so on. It will have four unique effects: ① small size effect or volume effect; ② Surface effect and interface effect; ③ Quantum size effect; ④ Macroscopic quantum tunneling effect. Due to the above four effects, nano materials show the following properties: ① high strength and high toughness; ② High coefficient of thermal expansion, high specific heat and low melting point; ③ Abnormal conductivity and magnetic susceptibility; ④ Extremely strong microwave absorption; ⑤ High diffusivity

nano materials are the most basic component of nano science and technology. Nano materials are structurally composed of two components: one is particles with nano scale, which are called particle components (or primitives); One is the interface components between these particles, also known as nano grains and grain interfaces. According to the structure, nano materials can be divided into four categories: ① the grain size is called three-dimensional (3) meter materials (nano block solid materials) in at least one direction and within a few nanometers; ② Those with hierarchical structure are called two-dimensional (2) nano materials (nano films); ③ Those with fiber structure are called one-dimensional (1) nano materials (nano linear structure materials or nanowires); ④ Those with atomic family and atomic beam structure are called zero dimensional (o) nano materials (nano powders). Among them, nano powder has the longest development time and the most mature technology, which is the basis for the production of other three types of products

nanocomposites refer to composites that are used as dispersed phase materials and are at least within 100nm in one-dimensional direction. Nanocomposites provide a new way for the development of high-performance Shendong development and preparation center to save 1.1 million yuan of energy materials and improve the performance of existing materials

IV. key technology for the preparation and detection of nano packaging materials

the development of nano material preparation technology has made the preparation of nano packaging materials with different shapes and structures possible. In order to find a preparation method with large output, low cost, no pollution and controllable size, and serve the industrialization

1. The preparation methods of nano materials include physical method and chemical method. Physical preparation methods mainly involve physical change processes such as evaporation, melting, solidification, deformation and particle size reduction, including crushing method, evaporation condensation method, ion splashing method, freeze-drying method, electric spark discharge method, explosive sintering method, etc. The process of chemical preparation of nanoparticles usually involves basic chemical reactions, in which the atoms between substances are organized and arranged, which determines the existence of substances. Chemical methods mainly include gas-phase chemical reaction method, precipitation method, hydrothermal synthesis method, spray thermal conductivity method, sol-gel method, r-ray irradiation method, phase transfer method, etc

2. Preparation methods of nanocomposites: (1) high energy ball milling; (2) Combustion synthesis; (3) Chemical vapor deposition; (4) Melt blending method; (5) Cutting method (cutting layer composite technology)

3. Direct synthesis of nanostructures is a feasible method to obtain synthetic nano materials: (1) nano cutting layer polymerization; (2) Phase separation block polymer; (3) Hybrid materials; (4) Assemble and synthesize nano phase; (5) Silk like fiber forming technology; (6) Reactive synthesis of hyperbranched or dendrimer; (7) Nano structured materials are assembled in organisms (called biomimetic nano synthesis)

4. The surface modification of nano materials can be roughly divided into six kinds: (1) surface covering modification (Surfactant covering modification); (2) High energy surface modification; (3) Outer membrane modification; (4) Local activity modification; (5) Mechanochemical modification; (6) Modification was carried out by precipitation reaction

5. There are LB technology, self-assembly (SA) technology, electrostatic assembly (ESA) technology and template assembly (TA) technology applied to the non conductor assembly technology of nano grain

6. Nanotechnology must have two conditions: first, nano size, a new physical property that is not found in nature. The detection and measurement techniques can be summarized as follows: (1) scanning probe microtechnology; (2) Optical heterodyne interference technology; (3) X-ray interference microscopy; (4) Pico technology based on F-D ticket

v. proposition and necessity of nano packaging and printing

in accordance with the goal of "catching up with and surpassing the advanced level of international packaging and printing" put forward by General Secretary Jiang, in the "Tenth Five Year Plan" of China's packaging industry and the industrial development plan of 2010, increasing technological efforts, improving scientific and technological content and technological innovation, and building a high-tech packaging and printing base are important measures to expand regional economy and jitter growth. The central role of packaging in the process of economic development is gradually emerging. China's packaging market is growing at a geometric progression of 12-15% per year, which will undoubtedly be a new economic growth point and huge market with great potential

the application and development of nanotechnology and nano materials provide a golden opportunity for China's packaging industry. Therefore, we should lose no time in developing the application research of nanotechnology in the field of packaging and printing. The proposition of nano packaging and printing is:

1. The definition of nano packaging has no accurate definition of nano packaging at present, but from the perspective of nano science, nano packaging is a general term that reflects the nano synthesis, nano addition and nano modification of packaging products using nano materials and nano technology, so that they have nano structure, scale and specific functions

2. Nano packaging has four elements: nano packaging elements, nano packaging container elements, nano packaging technology elements, and nano packaging information elements

3. Nano packaging materials: refers to the system of nano composite packaging materials made of nano particles or crystals with dispersed phase size of nm and other packaging materials

4. The objects and tasks of nano research are: To study the motion state and law of nano packaging in the logistics process, the law of physical and functional changes of nano packaging and preparation technology; Study the relationship between nano packaging and multidisciplinary, so as to put forward new packaging concepts, improve and create new packaging technology and decoration technology, and shorten the process of engineering, industrialization and commercialization of existing packaging enterprises and nano packaging

VI. research on the application of nano packaging and printing

1. Nanocomposite packaging materials

with the increasing demand for special functions of packaging in the 21st century, the emergence of requirements such as anti explosion packaging, anti electromagnetic packaging, camouflage packaging, high resistance packaging, stealth packaging, anti radar packaging and so on has promoted the development of nano packaging technology. Nano materials compounded by nano materials can not become a kind of high-tech materials needed. In the field of packaging, polymer based nanocomposites (pnmc) have been the most studied nanocomposites abroad in recent years. For example, adding 10% nano TLCP (thermal liquid crystal polymer) to the polymer will increase the tensile strength of the material to 470mpa, which will greatly expand its use and save scarce resources

2. Nano antibacterial packaging materials

nano antibacterial packaging materials have become a hot topic. Japan added a new type of inorganic bactericide to packaging materials, and added antibacterial agents and synergists to polyolefin films. At present, the widely used antibacterial films platinum, gold, platinum: gaofushuai proprietary. Under the transformation of nanotechnology, pure natural basic materials can play an amazing bactericidal effect, antibacterial and sterile packaging, and can denature or precipitate bacteria. Once they encounter water, they will exert greater damage to bacteria. And it has strong adsorption capacity, strong penetration, and strong antibacterial effect after washing

3. Modification technology of nano packaging materials

(1) the addition of nanoparticles to plastics not only plays a reinforcing role, but also has many new characteristics. Because of its light transmission and small particle size, nano-SiO2 can make the plastic become dense, which greatly improves the transparency, strength, toughness and water resistance of the plastic film. Therefore, it can be used as a high-grade plastic packaging film for special purposes

(2) nano alumina is added to rubber, which greatly improves the wear resistance and

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