Due to the development of thinning technology, the types of metal foils are greatly increased. The main varieties are gold foil, copper foil, stainless steel foil, aluminum foil, titanium foil, tantalum foil, “palladium foil, tantalum foil, nickel foil, silver foil, lead foil, zinc Foil, iron foil and various alloy foils such as nickel-CR, etc. The development direction of metal foil has three types: long, super-thin, super-thin, multi-hole and composite.
The development of profiled materials is also very rapid, and all kinds of special-shaped (such as complex peak and socket type) materials are produced, and the profiles are becoming thinner, lighter, and functional. Profiles, particularly paper honeycombs, are also used in the packaging industry, and they are promising.
New Plastics and Plastic Alloys
In China, the main development plants are polysulfones, polyphenylene sulfides, polyether esters, polyacids, and polyarylates. Foreign polycarbonates, polyesters, polyphenols, and polyoxymethylene still dominate the market. Among them, polycarbonate has developed the fastest. Engineering plastics mainly studies the modification and application of composite technologies, composite technologies and processing technologies. Plastic alloys mainly study the interpenetrating network, graft copolymerization and block copolymerization, molecular compounding technology in the alloying technology, reactive extrusion and mutual mixing and physical mixing. In foreign countries, PBT and PET alloys develop rapidly, especially in automotive and automation equipment and electronics. There are mainly PBT/ABS, PBT/PC, PBT/silicone, PBT/PPE, PBT/PET, PBT/alkenyl polymer systems. In foreign countries, PBT plastic alloys have also been used to manufacture special high-strength packaging containers. The performance of PET alloys in the United States (LCPl0%) is superior to that of PET, and it is also used in packaging.
Functional polymer materials
There are several major categories of functional polymer materials: 1. Electrically functional polymers such as conductive materials; 2. Optical functional molecules and photoconductive materials; and gradient-index polymers; 3. Chemical functions such as catalytic materials and adsorbent materials 4, magnetic function plus magnetic polymer materials: 5, mechanical functions such as mass transfer functional materials in the separation membrane, oxygen-rich membrane polymer materials; 6, biological functions such as biomedical polymer materials, biodegradable materials (heat shrinkable film ), heat-resistant polymer materials, thermochromic materials; 7, smart polymer materials, such as polypyrrole, poly warm phen, polyaniline and so on.
Silicone and fluorine materials
Silicon-based polymer materials are new materials in the 21st century. At present, on the basis of molecular design and molecular structure, synthesis reactions such as defluorination condensation and hydride silylation methylation polymerization are discussed, and molecular diversified functional materials are developed to develop photoelectron functional materials for high-grade composite membrane equipment. Silicone is an ecological material with excellent performance. It is mainly used in aerospace, automotive, construction, bioengineering, and other high-tech fields. The next stage goal is to improve molecular design and synthesis techniques, and to achieve the optimization of silicone functionalization, polymer synthesis, and material preparation techniques.
Good progress has been made in the application of fluorine-based materials in packaging. For example: PTFE's high strength, functionality, high stability, thermal stability of PEA, PVDF functional film. In addition, fluorine-based polymers with good piezoelectric properties, antistatic properties, radiation resistance, and abrasion resistance have also been introduced.
Special fiber
Modern fiber families are numerous. Fibers with different chemical structures give a great influence on the strength of synthetic fibers. In order to enhance or improve the strength and kinetic energy of fibers, the fibers have been subjected to surface modification treatment and corona, electroplating, vacuum coating, and the like. The use of ray processing techniques for superfibers can greatly increase their strength. Super synthetic fiber used in tires has undergone a variety of researches. Kevlar fiber has a variety of processes that do not use latex or rubber paste. High-functional fiber materials such as wholly aromatic polyesters, high-polymerization PE, fluorine-based, and POM have also been gradually applied in special synthetic fibers. Conductive fibers and magnetically conductive fiber composite plastics (films) are also widely used, mainly used in anti-static, electromagnetic and other sensitive packaging containers and packaging materials.
Special rubber and sealing, damping material
The specialty rubbers are mainly NBR, NHBR, CO/ECO and ACM, and the Japanese production level is the best. Among them, NBR has good performance, wide application, more than 300 kinds of specifications, and new functions of NBR are also coming out.
NHBH. The comprehensive performance lamp will only develop towards high strength. EC/ECO has excellent heat resistance, aging resistance and ozone resistance, and ACM is strengthening its oil resistance and plugging resistance.
Organic separation membrane
In view of the world's lack of domestic industrial water, the first developed cellulose acetate membrane was first used as a membrane to absorb sewage, it is also used today for the separation of various industrial wastewaters and food processing industries. High-performance separation membranes are one of the industrial basic technical topics in the 21st century. Therefore, the development trend in the future is to improve the performance of separation membranes, and to study the separation of water from alcohols, separation of hydrogen, separation of chlorine, and separation of hydrocarbons. In addition to oxygen-enriched membranes, there has been good progress in the study of high-molecular compound immunosorbent separations for the treatment of blood electrostatics and pathogens. Separation membranes and separation extrusion technology occupy a very important position in the production of food, beverage processing and space water, mineral water, beverage water distribution, and are widely used.
Biopolymer materials
Biopolymer materials have entered the experimental stage, such as artificial blood vessels, artificial heart, artificial valves, artificial lungs, artificial warts, artificial bones and so on. The application of biopolymer materials in packaging is expanding. For example, microbial (bacterial) plastics, bovine degradable plastics, and bovine-derived biodegradable plastics are all hot topics in the packaging world today.
Organic optoelectronic materials
Photoelectron organic polymer materials new research varieties are: organic light-colored polymer materials, nonlinear optical materials, photoreactive materials, polarizing polymer materials, select light-transmitting polymer materials, photoelectric conversion functional materials, piezoelectric functional polymer Materials and so on. Non-linear optical polymers (NLO), gradient refractive index polymers (such as methyl phenate, vinyl benzoate, etc.) have also made great strides. Therefore, organic optoelectronic materials have great potential for application in special packaging.
Resin matrix composites
A variety of polymer composites are produced by adding a variety of fibers, granules, or films to a matrix resin. For example, adding conductive fibers into conductive functional materials, wave absorbing functional materials, adding ceramics, glass fiber and carbon fiber composite reinforced plastics, or different resin films and multilayer composites into composite materials, etc., its application fields are very wide; reinforced fiber composite There are more than 30 kinds of fibers in the model. Has been widely used in packaging mainly laminated composite, co-extruded composite, mixed
Reuse other types of composite materials.
The development trend of resin-based composite materials: First, to improve the composite process, improve the performance and function of composite materials; Second, select the appropriate materials and the best process to reduce the cost of composite materials; Third, the development of new varieties, such as the structure is being developed. Materials, functional materials, molecular composites, ecological composites, etc.
Metal Matrix Composites
Such composite materials have high strength, high modulus, good high-temperature parts, and good electrical and thermal conductivity. They are particularly suitable for aviation and other industrial sectors. Metal-based composite nuclear technology has made rapid progress and has many methods. Therefore, it is mainly used for composite metals of titanium, nickel, copper, lead and silver. In particular, light metal-based materials such as aluminum, magnesium, and iron, and composite materials include metals, non-metals, and other compounds.
The market and development status of metal matrix composites are arranged in the order of aluminum base, magnesium base and titanium tomb, but the growth rate is opposite. The most widely used star-aluminum-based and new titanium-based composite materials for packaging materials.
Ceramic matrix composites
Ceramic matrix composites mainly include: ceramics-metals, ceramics-ceramics, ceramics-polymers and their multilayer composites. Foreign research focuses on high-temperature superconducting ceramic materials, piezoelectric ceramic polymer composites, and nano-ceramic composites.