The hottest natural biological packaging materials

Natural biological packaging materials will be green to the end

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core tip: in the future, natural biological packaging materials will continue to improve and innovate with the support of ideal testing equipment technology from scientific research institutions, colleges and universities, industrial and mining enterprises, technical supervision, commodity inspection and arbitration departments, and gradually improve in immaturity, Or it will occupy a considerable market share in the packaging industry

[China Packaging News] in the future, natural biological packaging materials will continue to improve and innovate with the support of science and technology, gradually improve in immaturity, or occupy a considerable market share in the packaging industry

in recent years, the research and development of degradable plastics and biomaterials have greatly promoted the development of the global packaging material industry and become a popular choice for packers. However, degradable plastics themselves degrade slowly in soil and cannot be recycled in time; It can not be completely degraded, and there will be visual stains and other application drawbacks, which limits its application prospects. Therefore, natural biological packaging materials have become one of the most potential packaging materials with the advantages of complete environmental protection

plant fiber packaging materials

the natural components of plant fiber packaging materials reach more than 80%, and the articles made of them can be naturally degraded even if they are discarded in the natural environment after use. In addition, plant fiber packaging materials also have the characteristics of high strength, low density, natural surface texture, novel texture and so on, so they have received special attention in the packaging field

the application of plant fiber in packaging materials mainly includes two kinds of composite materials, namely, the composite material of plant fiber combined with starch and the composite material of plant fiber combined with polymer materials. The chemical structure of plant fiber and starch is similar, and they have good compatibility. After chemical modification and cross-linking and other chemical reactions under specific process conditions, the mechanical ability, water resistance and thermal stability of starch will be significantly improved. Adding an appropriate amount of plant fiber to polymers such as plastics can greatly improve the degradability and environmental friendliness of materials. However, there are great differences in properties between plant fibers and polymers, so plant fibers are usually modified by physical or chemical methods, and then combined with polymer molecules

in view of the advantages of plant fiber packaging materials, there are many studies in this field at home and abroad. Wageningen Agricultural University in the Netherlands uses wheat, corn and potato starch to develop degradable bioplastics without petrochemical products, and adds hemp fiber to improve its strength. This plastic can be used in the fields of packaging coating, food storage containers, garbage can lining, shopping bags and agricultural films. The straw board processed from straw has good functions of heat preservation, heat insulation, energy saving, good permeability, high impact strength, and has strong waterproof and seismic functions compared with traditional materials. In addition, when straw board is used as packaging material, its single technological innovation system gradually forms a bit quality that is only 1/10 of the same volume of paperboard material. In recent years, domestic researchers have developed disposable tableware cardboard with straw pulp as the main raw material, which has the functions of hot water resistance, no leakage, no layering, oil resistance and heat sealing, and can be used to produce writing paper after recycling. The film fresh-keeping bag made of Artemisia argyi powder and additives has the functions of antibacterial, mildew proof, insect proof and medicinal. It can also be cleaned and reused

plant fibers have a wide range of sources and low prices, and play a very important role in the development and research of natural biological packaging materials. According to the characteristics of plant fibers, the future development and application may be mainly reflected in the following three aspects

1. Further improve the water resistance of plant fibers. Plant fiber contains a lot of hydroxyl groups and has strong hydrophilicity. In order to enhance the water resistance of plant fiber composites, it needs to be properly modified

2. Further improve the pollution-free production process. Treating plant fibers with lye is the most traditional modification method to improve their bonding strength with other materials. However, most processes require washing the treated plant fibers, so it is inevitable to cause pollution in the process. Now the latest plant fiber treatment method, steam explosion treatment, is a pollution-free plant fiber modification method, which has a good application prospect

3. Reduce the production cost of plant fiber composites with other materials, so as to improve the competitiveness of plant fiber composites in the market

in recent years, plastic products that cannot be naturally degraded, abandoned due to human production and living activities, have led to serious white pollution, causing great pressure on the global environment. In addition, the increasing depletion of oil resources around the world has provided a good opportunity for the development and use of biodegradable materials. In the future, natural biological packaging materials will continue to improve and innovate with the support of science and technology, gradually improve in immaturity, or occupy a considerable market share in the packaging industry

starch packaging material

starch is a very common polysaccharide, which is the product of photosynthesis of plants, including more than 100 kinds of cereal starch, potato starch, bean starch and other starch. As a natural biological packaging material, starch packaging material has many application advantages, including: ① it will not pollute the environment; ② As it is a renewable resource, it will not face the threat of lack of energy resources; ③ It can replace some polymer packaging materials, especially in the application of edible packaging materials. Of course, in order to better meet the needs of industrial production, we also need to use chemical or physical methods to treat natural starch, so as to overcome its defects in cold water solubility, poor freeze-thaw stability and other properties, and then improve its original performance or even add new performance. In recent years, researchers have mixed starch with completely degradable polymer materials such as polyalkyl butyrate (PHB) and polylactic acid (PLA) to form composite packaging materials, which greatly reduces the application cost of packaging materials

at present, starch packaging materials mainly used in the industry include modified starch packaging materials, allosteric starch materials, composite starch packaging materials, etc. Starch based bioplastics have also been widely used. According to incomplete estimates, its annual output has exceeded 25000 tons, of which more than 75% are used in the packaging industry. The main products include packaging plastics, packaging bags, packaging films in the construction of Beijing Shanghai high-speed railway project, etc. It can be said that starch based bioplastics have become the main substitute of traditional packaging plastics