Solvent-free adhesives are a type of polyurethane adhesive that can be either a one-component or a two-component adhesive, which is simply the bonding and joining of the medium in the absence of solvent. It is a potential adhesive that can be used in food packaging, etc.
With the strengthening of environmental protection and safety awareness, solvent-free glue is receiving more and more attention from soft packaging companies.
At present, the commonly used adhesives in domestic packaging materials are mainly solvent-based polyurethane adhesives, accounting for more than 90% of the composite adhesives. In contrast, countries and regions such as Europe and the United States, water-based or solvent-free composite adhesives have been widely used in the field of food flexible packaging. In North America, aqueous and solvent-free composite adhesives account for nearly 60% of the flexible packaging composite adhesive market; in Europe, waterborne and solvent-free have accounted for nearly 50% of the flexible packaging composite adhesive market. The advantages of aqueous and solvent-free composite adhesives compared to solvent-based adhesives are solvent-free residue, fast compounding, energy savings, and more.
Solvent-free composite technology originated in Europe in the 1960s and has developed rapidly in environmentally-conscious Europe and the United States. By the end of 2000, solvent-free composite products accounted for about 60% of the entire European market, and combined with extrusion. Together, they gradually eroded the dry composite product field. Some experts predict that solvent-free composite will eventually completely replace dry composite, becoming the main production method of flexible packaging. At the same time, it is worth noting that water-based adhesives have made great strides in the US market. For example, Rohm and Haas’s new two-component Robond L water-based adhesive not only maintains the advantages of one-component water-based adhesives, but also has water-based products that are inherently environmentally friendly and safer for workers and food. Features. At the same time, it does not produce volatile organic compounds (VOC), does not have aromatic amine migration problems, and can effectively reduce the residual solvent of the printed film. In addition to packaging snack foods, it can also package liquid or irritating foods and daily necessities, and Food that requires pasteurization.
In China, solvent-free compounding is receiving more and more attention. Solvent-free equipment companies, glue companies and packaging companies are working together for a common goal.
Advantages and features:
1 does not contain organic solvents. VOC zero emissions, very environmentally friendly;
2 The initial adhesion is fast. After the glue is kept at a certain pressure for 1 to 2 hours, the material can be stuck. After being placed for 3 days, the material can be cut, cut, planed, ground, drilled and other subsequent processing;
3 bonding materials are wide. It has a good bonding effect on plastics, rubber, wood, metal, etc. It is widely used;
4 construction is convenient. It can be smeared on one side with a scraper or a hard brush, and it can be bonded immediately after sizing.
Performance:
1 Appearance: colorless or light yellow viscous liquid
2 viscosity: 15000 ~ 20000 mpa.s / 25 ° C;
3 curing time: 72 hours (single component), 24 hours (two components)
Storage method and period
The iron drum is sealed and stored in a cool and dry warehouse. The storage period is valid for half a year.
Precautions:
1 can not be mixed with other glue;
2 Please seal the cover in time after opening the cover;
3 It is recommended that the glue should be used without dilution. If it needs to be diluted in special cases, please use special thinner.
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