Whether it is the pre-contaminated paper product packaging, or the post-contamination plastic packaging, as well as the sewage treatment of pigments and fillers for printing inks, the focus is simply on the light, heat, and moisture on the oxidation and the use of the product after it is difficult to degrade until incineration, its fundamental way out. In the development of different inorganic materials and the development of fine organic additives. The modification of waste or the reuse of renewables can not be separated from the introduction of enterprise manufacturers' demonstrations and the preferential policies of government departments. The enhancement of green environmental awareness has given epoch-making significance and vitality, and has gradually been recognized and promoted by the society. The formulation of environmental laws and regulations and the education of social morality help to change the bad behavior of discarding packaged goods at any time and place. Cross-century packaging science and technology of electromechanical, intelligent, automation is quietly coming to us. The selection of energy-saving, low-consumption, reuse, non-toxic, anti-pollution, and high-functioning pollution-free materials has become a social project for green packaging.
The use of inorganic and inorganic additives, organic and organic additives, or organic and inorganic additives for synergy has become a trend of the times. In order to ensure that our packaging products are continuously replaced by new generations, we are in an invincible position in the competition. Based on the feedback from relevant documents, accumulation and practice, and users' information collected over many years, the author has repeatedly screened and refined them to roughly uncover the following: The veil of the function of the packaging material facilitates discussion among colleagues in the packaging industry. It also has a clear sky and a clean and pleasant land.
First, the development and application of inorganic materials
1. The use of paper, plastics, and printing inks has a wide range of uses. It is inexpensive, white, and has good processing performance. When calcium carbonate is used, it is a polar active material. Under the cooperation of organic additives, it can almost meet the performance requirements of the above industries, as filling, Dries and enhancers are the lowest prices.
2. The talcum powder (monoclinic), which is often synergistic with calcium carbonate, can increase the retention rate of papermaking pulp, the rigidity and heat resistance of plastic products, and the light transmittance of films, improve the function of packaging film, and improve the heat preservation of ink at night. , And in the water-based ink leveling, anti-sinking effect, and even PVC plastic nucleating agent.
3. Kaolin as inorganic nucleating agent (also known as high clay), can make polypropylene plastics form fine spherulites, improve mechanical strength, can also be used as PVC insulation material for the production of high-voltage cable above 6KV, in papermaking pulp The retention rate is also slightly better than that of calcium, and it is added to plastics in white, gray and yellow respectively. After being blown, extruded, injected, calendered and rotomolded, it is made into different color packaging products.
4. The wollastonite with an atomic content of 16.7% in the earth's crust has a good aspect ratio (a triclinic system). It is mostly used as a substitute for higher-priced glass fiber. It is often used to make heat-resistant cardboard and used as plastic. The reinforcing agent of the packaging material can effectively improve the wear resistance of the product and the stability of the package size, and can cooperate with the halogen-containing flame retardant in fireproof plastic packaging products and fireproof liquid printing inks. The material contains OH in the crystal lattice, which can effectively prevent the pigment and filler from depositing in the ink. Since wollastonite crystals emit fluorescence or phosphorescence under ultraviolet irradiation, they are often used as epoxy inks.
5. The mica known as ""thousand-layer paper"" is a very complex silicate material, because the crystals often assume a pseudo-hexagonal shape, and the aggregates are columnar, plate-like, and scaly, except for packaging materials such as paper and plastics. In addition to the decorative filler, it is a typical reinforcing agent, which can effectively improve the rigidity, heat resistance and dimensional stability of the product, and promote the transmittance of scattered light, which is superior to other inorganic fillers. Extremely high electrical insulation resistance to acid and alkali corrosion.
6. Quartz ore is used as a filler material in semi-rigid polyvinyl chloride plastics, and its wear resistance is several times that of calcium carbonate.
7. Magnesium oxide has been used in printing inks in recent years, especially in rotary printing inks, which can greatly increase the gloss of printed graphics.
8. The diatomite which is an inexpensive, anti-sinking and unique anti-settling ink product system has been successfully developed as a filler for artificial leather, rubber imitation sheepskin and other fillers. The prospects for the extensive use of inorganic materials are very promising.
Second, the exploration and application of organic materials
In the packaging materials such as paper, plastics, and printing inks, if the development and application of inorganic materials is an expansion of quantity, the research and application technology of organic materials will achieve a qualitative leap. Its purpose is not to blindly pursue the trend of green fashion, but to curb the depletion of natural resources and retard the deteriorating natural living environment. In order to ease the plight, people have continuously introduced inorganic packaging materials, and they have also continuously researched and developed the highly efficient, non-toxic, and hundreds-of-a-kind commercial packaging material additives used in conjunction with inorganic additives.
1. Antioxidants and auxiliary antioxidants. Used to improve the resistance of plastic products and printing inks. Delaying the onset of rust initiation of oxidation delays and prevents deterioration of the package during storage or use. The domestic production of commonly used phenols and sulfide ester antioxidants is more standardized and standardized in Tianjin Lisheng Chemical Factory.
2. UV absorber UV-P, UV-326,
Uv-327, etc., are several kinds of light stabilizers, which have the ability to absorb ultraviolet light in sunlight or fluorescent light sources and their structures cannot change (all varieties are Beijing Chemicals Third Plant and Tianjin Lisheng Chemical Plant). It can effectively prevent the photo-decomposition of plastics, inks, packaged foods and other substances under long-term exposure to sunlight.
3. Coupling agent (classified as silicon and titanium). The fifth generation of coupling agents - organosilanes, organic titanates, organoaluminates, organic zirconates, etc., were introduced, and the first number of Yizheng Tianyang Chemical Plants was the leader in quality. The coupling agent is a bridge between plastics, inks, papers and fillers, which can increase the degree of branching and interfacial adhesion of the resin, and can significantly reduce the graphic thickness of the packaging printing ink and achieve firm adhesion.
4. Lubricant anti-adhesive agent. Improves adhesion and adhesion, lubrication and dispersion, flow, and stripping of plastic materials and printing inks. As a solution dispersant, it is a white oil, an alcohol, and an ester. In the late 1990's, the treatment of pigments and fillers with electrically neutral hyperdispersants containing an equal amount of anions and cations (mostly in the form of anchors) was not chemically available in the past. Because the additive is well mixed with many binders (compatibility), it competes with the adsorption resin and solvent, greatly reducing the dispersion time, and is currently one of the varieties with promising foreground of amphoteric surface activity. Commercially available low molecular weight polyethylene, stearic acid, etc. have both emulsification, anti-settling, thickening, and stabilizing effects, replacing traditional glial calcium and organic bentings. Oil phenolic amine, erucamide and other properties are relatively single, such as anti-adhesion, anti-static and dispersion.
5. Brighteners (known as whitening agents, are also divided into water-soluble and solvent-like, the price is very different, 20-1500 yuan / kg range). General decomposition temperature of 190 °C ~ 235 °C, and DBS can withstand high temperature of 360 °C is rare. Brighteners have excellent leveling and infiltrating properties. Its maximum spectral absorption wavelength is 370 nm. It is mainly used for whitening of paper, plastic, and ink, and can improve the appearance of a certain degree of whiteness of the package.
6. Heat stabilizers, mostly aluminum stearate, calcium stearate, and zinc stearate, are used in plastics, papers, and printing inks to effectively prevent molecular materials from being processed, manufactured, used, and stored. Heat is subject to degradation, cross-linking, discoloration, and aging to achieve long-term use and quality protection. The earlier development in China was the Shanghai Zhonghua Chemical Plant.
7. Nucleating agent. Generally used for "" remote disorder, close order "" crystalline polymers. Different from inorganic nucleating agents, the transparency of packaged products can be greatly improved. The exclusive SKC-Y5988 developed by Songzi Resin Factory is not only less than 2/5 of the price of similar products in the US, but also of comparable quality. Organic nucleating agents can increase the crystallinity and crystallization rate of plastics, reduce the diameter of spherulites and control certain morphologies. Therefore, the transparency of polymers is improved, the yield strength and impact strength are increased, and the molding cycle and low-temperature characteristics are shortened. Ethylene plastic content, the chain is more evenly distributed and better than inorganic nucleating agents, increasing the high value of the packaging of goods. Recently tried on PE and photosensitive resin plate, the light transmission is ideal.
8. Plasticizers. It is often divided into main plasticizers and auxiliary plasticizers, as well as internal plasticizers with surface plasticization and architecture. Commonly used by chemical structure are: phosphate ester series, phthalate ester series, aliphatic dibasic ester series, epoxy compound series, polyester series, chlorine-containing compound series, benzene poly ester series, fatty acid monoester Series, pyromellitic acid ester series, and trioctyl trimellitate are among the eleven major series of thirty-five varieties. Its role is due to the insertion of plasticizer molecules between the molecular chains of the high molecular polymer, which weakens the attraction between the molecular chains of the polymer, that is, weakens the aggregation between the molecular chains and increases the mobility and flexibility of the molecular chains. Increased plasticity, excessive or unscientific use, often leads to deformation of paper and plastic products, and the chemical pinholes and binders of the photosensitive resin plates and printing inks become self-adhesive and cause application failure. Therefore, plasticizers are plasticizers for paper sizing and ink binders in the packaging industry, as well as lubricating and dispersing additives for plastics to add elastomers and fillers or coupling agents.
Third, the serious problem faced by packaging
Among the hundreds of additives for packaging and printing materials, the most commonly used cross-linking agent that enables the packaging product system itself to form a horizontal or vertical network structure, the initiator of the polishing agent or the photo-curing ink, prevents the adhesion of the goods and the packaging. Attached antistatic agents, plastic light-biodegradable catalysts, new papermaking methods for the efficient separation of cellulose and lignin invented in the past two years and chemical biotransformation, and a non-secondary degradation of degradable plastics have proven no negative The environmental impact. Therefore, without the invention and creation of material additives, there is no practical packaging technology innovation.
From the "value engineering" to the "orthogonal method", especially the "inverted algorithm" of inventions and creations in recent years, look at the innovative formulation design of packaging material additives to improve the application range and construction conditions and improve product quality. The provision of special functionalities has become an indispensable part of the packaging industry. The rational and correct selection of auxiliaries, scientific and careful scheduling of production, can greatly reduce packaging costs, increase economic efficiency, and reproduce the perfect packaging technology.
Whether it is paper product packaging or plastic product packaging; whether it is auxiliary photo-engraving or auxiliary printing ink, there is no packaging material without auxiliary agent, and there is no auxiliary agent that is not used for packaging material. A material additive and application level that enables perfect packaging, in particular the recycling and reusability of packaging, has become an important indicator of the level of packaging technology.
In summary, in addition to the application of the above additives, packaging products are also related to colorology, optics, acoustics, electricity, magnetism, mechanics, biology, and bionics. Green packaging material additives technology is the edge science that is developing, and is increasingly subject to the packaging industry. In particular, organic additives continue to cross the range of high-efficiency, series, non-toxic, safe, dedicated, simple, and easy to use.
Faced with customs clearance, economic integration, and big-to-large-bulk commodities, what should we do after the packaging market is liberalized?
The 21st century packaging industry must re-examine the challenges of environmental laws and regulations!
It is more important to train a high-quality packaging team than to research high-tech material additives.
In a word, function reuse first, decoration art second.
Reprinted from: Shenzhen Information Network