Talking about the characteristics of water-based and solvent-free adhesives

In the flexible packaging industry, water-based adhesives and solvent-free adhesives will be the direction of future development. In China, as people's awareness of environmental protection has increased and the importance attached to the safety of food packaging, more and more topics have been proposed for the color printing and packaging industry. Currently, the flexible packaging industry is highly competitive. It should be said that the entire industry has entered the era of low profit. How to reduce costs, improve its own competitive advantages, and produce products that meet the hygienic requirements of food packaging are issues that each business owner considers. The promotion of water-based adhesives and solvent-free adhesives in the market is precisely in line with this trend. At present, water-based adhesives in the United States account for 30% of the flexible adhesive composite adhesive market. In Europe, solvent-free adhesives account for 40% of the flexible adhesive composite adhesive market.

Over the years, flexible packaging composite adhesives have continuously undergone technological improvement and innovation, and the development direction of adhesives is also affecting the development trend of future flexible packaging. The new type of water-based adhesive can completely meet the requirements of dry compounding between most flexible packaging materials, and can be used on solvent-based dry complexes. From the perspective of the use of water-based adhesives by European and American countries, water-based adhesives can meet production process requirements, product packaging requirements, food packaging requirements and can stand the test of time.

Water-based adhesives can be used on existing solvent-based dry-repair equipment, and are suitable for many color printing plants eager to improve the situation of high residual solvent, reduce production costs, and do not need to make new equipment investment requirements. In the era of meager profits, water-based adhesives have created enormous value for users. On the one hand, they solve the problem of solvent residues. On the other hand, the use of water-based adhesives does not require investment in new equipment. This saves users a few. Million of equipment investment costs. Water-based adhesives are an ideal alternative to solvent-based adhesives. In particular, Rohm and Haas Company's Lopon® Robond® series of one-component waterborne adhesives is already fully available in the existing adhesives market. Shows unique performance.

First, can effectively reduce the residual solvent has been recognized by the soft package industry. Since water acts as a solvent, the adhesive itself does not cause secondary contamination of the solvent, and the printed film can further reduce the residual solvent after printing when it passes through the oven. Therefore, the use of an aqueous adhesive is quite effective in controlling the residual solvent. of.

Second, a high initial tack is a good operational performance. For composites of PE and M-CPP up to 40μ, the machine has an initial tack force of more than 1N/15mm, and due to the advantages of the water-based adhesive in terms of initial shear strength, it becomes possible to cut and ship without curing. . This kind of performance is quite effective for shortening shipping time, meeting customer needs, and improving the utilization of funds.

Third, the relatively low cost. Usually we describe the amount of glue required is 1.6-2.4g/m2, in fact beyond this standard is not required, it will not bring higher composite strength and better appearance. Robon? Robond? Waterborne adhesives have a solids content of 42% and do not require the addition of any solvents when used. Therefore, the composite cost per square meter will be significantly lower than that of most existing solvent-based compounds.

Fourth, improve the working environment, reduce pollution, reduce work intensity and avoid the risk of fire. Because the water-based adhesive does not need to be diluted and can be directly put on the machine, it reduces the labor for the operator to mix the adhesive, and also avoids the concentration of the solvent in the air at the work site, which is quite favorable for the operator. Of course, the absence of solvents also avoids the potential for fire.

Fifth, effectively reduce the occurrence of quality accidents. With water-based composite products, you can intuitively see the quality of the product, as long as you carefully check the appearance of the product appearance and composite strength is good, it will not have adverse changes over time, especially composite Intensity and appearance, after being placed for a period of time, the composite strength increases as the adhesive molecules blend and the appearance becomes better. Second, for the composite of aluminum products, water-based adhesives can effectively prevent the transfer of aluminum.

In the early days, due to inexperienced operation and immature application, the promotion of water-based adhesives did encounter some problems. To be sure, there are still some people who are worried about water-based adhesives. The first idea is that water has a high boiling point and is not easily dried. In fact, for a sizing amount of 1.6-2.4 g/m2, the required moisture content is 2.2-2.9 g/m2, compared to 2.5 g/m2 for a solvent-based adhesive, 35% operating concentration, The solvent that needs to be volatilized is 4.6 g/m2, and it can be seen that the amount of volatilization can be reduced by half with an aqueous binder, which is sufficient to compensate for the problem of high boiling point of water. The author concluded in the long-term test machine, do not change the oven's process parameters, the amount of solvent adhesive 2.5g/m2 gluing compound can open how much speed, change the water-based adhesive can open the same speed, dry There is no problem in the aspect; the second idea is that the surface tension of water is large, and the affinity of water and the film is not good, so the appearance may be poor. In fact this idea is not necessary. The application of rubber rollers effectively solves this problem. We have applied water-based adhesives in composite transparent packaging, and achieved good appearance and transparency; in the composite aluminum-plated structure, the water-based adhesives do not cause the phenomenon of glue spots, so the appearance is more complex than solvent-based adhesives. Better; the third idea is that long-term evaporation of water vapor can cause corrosion of the equipment. In fact, according to the five-year practice in China and more than ten years of experience abroad, the use of water-based adhesives has not caused the equipment to be corroded.

Rohm and Haas Company is an advocate and expert for water-based adhesives, and it is a global leader in the research, development, and marketing of water-based adhesives. Its introduction of water-based acrylic composite adhesives has been widely recognized by the packaging industry. Rohm and Haas also provides the market with another environmentally friendly adhesive-free solvent adhesive. In China, the absence of equipment for solvent-free adhesives and the immaturity of processes have seriously hindered the promotion of solvent-free adhesives. Since solvent-free compounding must have a dedicated solvent-free compounding device, it is not a small burden for the now-profitable color printing industry. Because of the unreasonable configuration of the non-solvent compound line introduced early in the country, approximately 60% of the equipment could not operate normally. This has also become an important reason for the development of solvent-free compounding in China. Another impediment to development is that our end customers tend to compare solvent-based composite products with solvent-free composite products. It must be admitted that, in appearance, the solvent-free composite product is indeed inferior to the solvent-based compound, because the solvent-free compound does not have a uniform and leveling process, so the product's transparency and adhesive uniformity The degree is worse. Of course, low-viscosity solvent-free adhesives help to improve the appearance and reduce the amount of sizing. Rohm and Haas Morfree? 403V/C83 is a functional solvent-free adhesive with low viscosity and easy handling. The performance, in the full version of the white aluminum composite structure, 1.6g/m2 above the amount of glue can be achieved completely no white spots. In short, the non-polluting and non-solvent compounded nature of high efficiency, will certainly become the mainstream of the composite approach. It should be noted that there are currently 6-7 color printing and packaging companies in China that are already quite mature in the use of solvent-free compounding. They have accumulated considerable experience in operation. Therefore, there is reason to believe that as long as competition in the packaging industry market becomes more standardized, Solvent-free compounding will have more room for development.

Environmental protection and high efficiency will be the trend of the future of the packaging industry. All domestic packaging material manufacturers are actively developing new materials and products that meet future needs. In terms of composite adhesives, environmentally friendly and safe water-based and solvent-free adhesives will replace traditional solvent-based adhesives. This has become the consensus of the packaging industry. It can be foreseen that with the continuous development of new environmentally-friendly adhesive products And promotion, as well as the gradual improvement of consumer environmental protection and hygiene awareness, those binders that contain damage to the environment and people's health will eventually withdraw from China's flexible packaging market. The packaging industry will usher in a better tomorrow!

Reprinted from: Printing Technology

The Stainless Iron Induction Base is made of food grade stainless steel. He is safe, durable, corrosion resistant, healthy material, and does not produce harmful metal substances, so as to avoid the second pollution of the process.We never use high strength steel to make food grade materials, so the quality is guaranteed.Stainless lron Induction Base

Stainless Iron Induction Base

Stainless Iron Induction Base,Safe Stainless Iron Induction Base,Stainless Steel Induction Base,Stainless Induction Base

Ninghai Feisheng Hardware Co., Ltd. , http://www.nbfeisheng.com

Posted on