At present, for the environment-friendly glue, the industry generally recognizes water glue, alcohol sol and solvent-free glue. These three types of glue have their own strengths, and glue manufacturers are constantly improving the properties and quality of glue according to different needs . However, for the future development, whether it is a glue manufacturer or a flexible packaging company, it is difficult to say clearly, it is difficult to say the development prospects of these three glues, which one is brighter? Which one will become the mainstream glue type in the future? Let's hear the voice from the front line of the enterprise
One, Water glue is more suitable for the development of flexible packaging enterprises
CITIC Printing Jiang Xuebin:
The prospect of solvent-free glue is better, energy-saving and simple, but the technology is not too mature, and it takes a period of experience to accumulate and improve the technology. Personally, I think that water glue is the ultimate environmental glue, alcohol sol and solvent-free glue are just transition products. As long as it can solve the application problem of water glue in various functional products, the prospect of water glue is still very wide The most environmentally friendly. Under current circumstances, solvent-free glue is still a more environmentally friendly, energy-saving and cost-saving transition product.
I think it is water glue. Although the application area is limited, it is currently limited to puffed food and light packaging. But it is easy to operate, environmentally friendly, no residue, no curing, and the comprehensive cost is second only to solvent-free glue. However, there are certain requirements for composite equipment.
Jinjiang Wuyuan Packaging Tang Yongqiang:
Water-based adhesives can be used directly on existing dry laminating machines, so they are welcomed by domestic flexible packaging manufacturers. Our company also has mature application experience. Water glue has the following advantages: high composite strength, and the amount of glue is much less than solvent-based glue. The product after water glue compounding is softer than solvent glue and is more suitable for the compounding of aluminized film. It does not need to be cooked, and can be cut after the machine is off. The glue layer is thin and the transparency is good. Environmental protection, harmless to workers. Compared with solvent-based adhesives, water-based adhesives can save 20% of the cost of use. The main purpose of using water-based adhesives is to reduce the transfer of aluminum coatings and shorten the lead time. Compared with solvent-based adhesives, the operation of water-based adhesives is simpler. At present, most companies on the market use single-component water-based adhesives, which are mainly for aluminized structures of light packaging. In order to expand the use of water-based adhesives, some leading multinational companies have focused on the development of two-component Water-based adhesive, that is, through certain cross-linking, the heat resistance and chemical resistance of the adhesive are greatly increased, which greatly improves the composite peel strength and heat seal strength.
Mr. Zhang from a flexible package:
Alcohols are a transition, and they must be hydrogels and solventless gums in the end. Because the application area of flexible packaging-food and drug safety becomes more and more sensitive with the spread of information. Food and drug companies with a certain market share have paid more and more attention to the laws and regulations on packaging materials. Flexible packaging manufacturers have chosen to choose non-residual glues, as long as they want to continue. Of course, flexible packaging companies that do not do food and medicine are another matter. Of course, the change of glue has brought a lot of pressure to the soft bag enterprises, because some of the old domestic composite equipment and water-based glue are difficult to match. Then, to use water-based glue, it is bound to start with the equipment update. In terms of the safety of the final product, solvent-free glue is also a trend. However, it should be said that the solvent-free compounding has already been quite different from the traditional compound operation method, which requires enterprises to make efforts in operation training and management, otherwise, the production capacity of the equipment will be reduced.
Hua Gang (Foshan) Color Printing Co., Ltd. Mo Gang:
Because our company is directly under the central government, it places special emphasis on environmental protection and sustainable development. In July this year, it passed the certification of cleaner production enterprises. Therefore, the emphasis on auxiliary materials requires environmental performance. For example, water glue meets our production requirements. Other glues have been eliminated by the company. We have paid close attention to solventless adhesives recently, but because we feel that our company's technology is not yet mature, we have little confidence in using it.
two, Alcohol is more suitable for the development of flexible packaging enterprises
Shanxi Guanghuayuan Pharmaceutical Packaging Co., Ltd. Zhang Jianbing:
I personally think that the development prospect of solvent-free glue is the best, solvent-free glue has low energy consumption and low cost, which is in line with the green and low-carbon economy. Solvent-free glue has the most cost advantage. But currently, alcohol sols are the best and the best.
Overseas Chinese Packaging-Wang:
At the current stage, the processes of hydrocolloid and alcohol sol are relatively stable, and there are no problems with solvent-free processes, but there are several existing problems (large haze, increased rigidity after product compounding, composite PE materials affecting openness, 3 ~ 4 Layer products can not be completed at once, etc.) Before it can be completely solved, the startup rate cannot be improved, which also brings a long time to improve the hydrogel and alcohol sol used in dry compounding. When comparing the cost of the three glues, the solvent-free is definitely lower, water glue is second, and alcohol glue is the highest. The alcohol sol has lower requirements on equipment and environment, water glue has higher requirements on drying systems and continuous production, the price of the solvent-free equipment itself, the technical requirements of the operator, the mixing of glue, the more expensive rollers, and the order quantity requirements These have limited the popularity of solventless. Therefore, I personally prefer the alcohol sol.
three, Solvent-free adhesive is more suitable for the development of flexible packaging enterprises
Hunan Yueyang Packaging Xiaochen:
I personally think of solvent-free glue, first of course because of environmental protection, and secondly, it has something to do with the equipment: solvent-free glue can be accurately proportioned to ensure compound quality; second is no odor; third is normal temperature curing. These three aspects are the advantages of solvent-free. And solvent-free glue can now also be used for high-temperature cooking, aluminized packaging, and aluminum foil composite. Although hydrocolloids and alcohol sols are environmentally-friendly glues, hydrogel-composite aluminum-plated or white-inked products are prone to white spots and volatility is not very good, and hydrogels have certain requirements for equipment. I don't know much about alcohol sols. If you use them, you need to consider whether alcohol sols are compatible with inks. What is the preservation and printability of alcohol sols? And is it compatible with any ink?
蒋国荣： Dongguan Taihe Jiang Guorong:
Now I am most optimistic about solvent-free glue, because solvent-free glue is environmentally friendly, has no solvent odor during production, and has high production efficiency, low glue volume, and later cost is much lower than solvent-based. Of the three types of glue, solvent-free glue has the most cost advantage. As far as the use effect is concerned, ester sol is best to be used at this stage. This is because in terms of appearance, the ester sol can know if there is a problem immediately after the machine is off, and the solvent-free glue will not know the appearance of the glue until the glue is completely leveled. But I'm bullish on solventless glue.
Zhengcheng of Anhui:
Needless to say about the advantages of solvent-free. The most important thing is that solvent-free equipment, glue and raw materials have the possibility of popularization. The biggest problem at present is the lack of skilled workers, but solvent-free should be the most promising. A composite process.
： Mr. Amkolu :
In order to meet the various performance requirements of food for composite packaging materials , many countries have conducted in-depth research on solvent-free, developed a variety of solvent-free adhesives, and basically achieved the performance of solvent-based polyurethane adhesives. The first generation of one-component solvent-free adhesive was the first solvent-free polyurethane adhesive used in solvent-free composites. Its curing mechanism is the cross-linking reaction between the NCO group of one-component polyurethane adhesive and moisture in the air. This kind of adhesive is characterized by large molecular weight, high viscosity, requires higher operating temperature, and requires humidification equipment during use. Failure to provide adequate moisture can also cause problems with poor curing. The first generation products are only suitable for paper / AL, paper / plastic composite. Later, on the basis of the first-generation single-component solvent-free adhesive, an improved product that can compound various structures and that can withstand high-temperature cooking has been developed, but it is not suitable for composite aluminum coatings because it depends on air. Humidity cures, so the degree of reaction is difficult to control, which can cause aluminum transfer. The second-generation two-component solvent-free adhesive is composed of two groups of polyurethane prepolymers, and the two components cross-link with each other during curing. The reaction speed is very fast, the initial adhesion strength is high, and the operating temperature is low. It is suitable for various films and aluminum foils other than EVA, PA, and EVOH, but it cannot be cooked at high temperature, and it contains more free monomers, which is easy to precipitate. Heat-seal layer, and react with moisture to affect heat-seal.
In order to overcome the shortcomings of the second-generation products, the industry has also developed the third-generation two-component solvent-free adhesive. Solvent-free polyurethane adhesive is this generation of products, which has the following characteristics: low viscosity and good leveling. Fast response and strong initial adhesion. Low operating temperature makes it easy to control. Excellent content resistance, no restrictions on composite substrates. The content of free diisocyanate groups is low.
From a long-term perspective, as environmental regulations become more stringent and people ’s awareness of self-protection continues to increase, packaging materials that meet safety and hygiene, resource conservation, and environmental pollution are becoming more and more popular, and solvent-free composites are just in line. This trend. With the localization of solventless equipment and solventless adhesives, solventless compounding is rapidly developing in China. It can be known that in the future, solvent-free compounding should be the mainstream, and solvent-free glue is the development direction.
Chongqing Weiyou Packaging Wang Wei:
I am more optimistic about solvent-free glue, because it can reduce costs and is easy to operate, but it is not yet mature. Water glue is also low cost, but only suitable for simple products. The cost of the alcohol sol is too high, and the cost may be reduced after a period of adjustment. In the current fierce competition in the industry, all companies are thinking about how to reduce costs, so the most cost-effective solventless adhesive should be the trend.
Gravure technology beam:
Each of the three types of glue has its advantages. Water glue is easy to handle but its fastness is not stable. Alcohols are relatively stable but cost a little more. Solvent-free glue has low cost and simple operation, but its stability needs to be improved. Based on the above analysis, I personally think that the future of solvent-free development is good and the market prospect is promising.
We are optimistic about solvent-free adhesives because of its environmental protection, energy saving (power saving), high efficiency, less production area and low cost.
Europe and the United States Chemical Co., Ltd .:
Optimistic about solvent-free glue. Because there is no residue, it is environmentally friendly, hygienic, and cost-saving. Fast speed. High Yield. The solvent-free composite operation process must be careful.
Regarding hydrocolloids, alcohol sols, and solvent-free gels, I personally think that the application range of hydrogels and alcohol sols is too small and has certain limitations. In the end, it is the general trend to use solvents to achieve environmental protection and reduce costs.
Dong Benyao of Mianyang Xinhongyu Printing Co., Ltd .:
Of the “hydrogels, alcohol sols, and solvent-free adhesives”, the best prospects for future development are of course solvent-free adhesives (but at least 10 years can be widely promoted); if hydrogels can solve the slow compounding speed and poor peel strength And other issues, there are broad prospects for development, otherwise, it can only be used as a transition glue. Compared with the solvent composite process, the solvent-free composite process has the following advantages: The composite film after compounding has no solvent residue, which is more suitable for packaging of goods that are very sensitive to odors; no solvents are used in the production to avoid environmental pollution; and fire and explosion Hidden dangers are reduced to a minimum; the solvent-free composite equipment has no drying box, which reduces energy consumption; the solvent-free composite speed is fast, the production efficiency is high, and the comprehensive cost is low.
To say the cost advantage, according to the specific situation: if the batch size of the composite product is large, the equipment has a long service life, and the solvent-free glue has a large cost advantage; if the batch size of the composite product is average, and the equipment life is short, it is Alcohols have cost advantages.
In terms of best use, of course, alcohol sol is easy to use. If the effect is the best, it should be analyzed from different aspects: in terms of solvent residues, of course, solvent-free glue has the best effect; in terms of peel strength, these three glues are not ideal. Relatively speaking, alcohol sol, Solvent-free glue is better, and water glue is the worst.
Zheng Fang, Wuhan Fangcheng Technology New Material Co., Ltd .:
In terms of the cost of glue, safety and environmental protection, the future development of solvent-free adhesives is good. The market share of solvent-free adhesives in China in the next 5 years may reach more than 30% of the total composite method. The compound cost of 1 square meter of solvent-free adhesive is about 6 cents; the compound cost of 1 square meter of alcohol sol is about 9 cents; and the compound cost of 1 square meter of hydrogel is about 8 cents. From the cost of glue alone, the cost of solvent-free glue is the lowest. As a user, you need to decide which type of glue to use according to your own structure and application.
Zhang Shixiang of Fuller (China) Adhesives Co., Ltd .:
The future development should be solvent-free glue. This is because in terms of cost, hydrogels and alcohol sols are higher. In terms of environmental protection, hydrogels and alcohol sols require an oven and consume energy. In addition, wastewater and solvent emissions may also pollute the environment. Then there is the residual solvent that needs to be considered. Therefore, solvent-free glue is the most promising. Of the three types of glue, solvent-free glue has the most cost advantage. The cost of solvent-free glue for general applications can basically be about 6 cents per square meter.
As far as the use effect is concerned, water glue is currently used for ordinary aluminized film. The effect of aluminum plating transfer rarely occurs, but the heat seal and composite strength of water glue are relatively low. In addition, water glue is not suitable for boiling. , Cooking structure.
Alcohol-soluble glue is between water-based glue and solvent-based glue. It is relatively environmentally friendly (for solvent-based glue) and can also take into account the composite strength, but the cost advantage is not obvious. It should be a transition product.
Solvent-free glue is currently mature in technology and basically covers all applications. Except for some occasions where the aluminum foil structure has a very high composite strength (now the solvent-based high-temperature cooking glue market), others can be replaced. At present, solvent-free glues in China still need to solve the appearance problems of PET / AL and PET / VMPET at high speeds.
Hunan Yinteng Packaging Yu Dingzhao:
From a cost perspective, the absence of solvents in the three types of glue is the most cost-effective, about 5 minutes / m2, the cost of water glue is about 8 minutes / m2, and the alcohol sol is about 6 minutes / m2. . Personally, I am most optimistic about the application and development prospects of solvent-free adhesives. At present, as far as I know, alcohol sols have basically withdrawn from the market, and the prospects for hydrogels are not optimistic. If the domestic dry compound machine can be driven to 150m / min with ester sol, water glue can only be driven at 100 ～ 120m / min.
Chongqing Sanhao Packaging Co., Ltd. Tang Fang:
I am personally optimistic about solvent-free adhesives. The high efficiency and low cost of solvent-free compounding are its major advantages. Now many domestic packaging factories are beginning to introduce equipment. However, there are still limitations in the applicability of solvent-free composite adhesives, which must be continuously tested and tried.
Under the same material conditions, the peeling of the hydrogel is slightly worse. Solvent-free should dominate in the future.
Wenzhou Huanan Printing Industry:
From the perspective of cost, production efficiency, environmental protection, etc., of course, solvent-free glue is preferred. However, the adaptability of solvent-free adhesives is not good at present, but I believe that solvent-free adhesives will continue to improve in the future development, so personally I think that solvent-free adhesives will dominate in the future.
Guangzhou Xinan Packaging Co., Ltd. Peng Zhanen:
Compared with ester-soluble glue, water-soluble glue, alcohol-soluble glue, and solvent-free glue have their own characteristics. Generally, acrylic resin or polyurethane resin-based water glue has high solid content and good leveling. There is no solvent volatilization during processing, but it requires higher drying temperature and compounding temperature, high energy consumption, and can only be applied to BOPP // CPP, BOPP // Pearlescent film, BOPP // VMCPP and other light packaging. Alcohol-soluble glues use alcohol as the main solvent (generally ethanol). The compounding process is not much different from ester-soluble glues. The volatile ethanol during processing is less irritating than ethyl esters. It can be applied to all kinds of ordinary packaging. After the compound is compounded, it is susceptible to erosion by hydroxyl-containing water, so it is generally not used for products such as boiling and cooking, and its application range is limited.
As a new generation of environmentally friendly glue, solvent-free glue has a wide range of applications, including 100 ° C boiled water and most 121 ° C high-temperature cooking products. There is no organic solvent volatilization during the processing. No drying system is required. It is difficult to process products with PET // Al structure, and a dedicated solvent-free laminating machine is required, which requires a large investment. Based on various factors, solvent-free adhesives will gradually occupy a place in the development of flexible packaging due to its environmental protection, wide use, and low cost.
Xiaoyong of Central South Packaging:
Three kinds of glue, water glue is mainly composite aluminum plating and paper. Alcohol sol water is generally used for compounding with PET / OPP / NY as the base material. The relative peeling force is higher, which can meet the high quality requirements. Alcohol sols occupy the market with special functions, such as media-resistant packaging. From an environmental perspective, all three are similar. But I personally think that solvent-free is the future development trend. This is because the development of solvent-free compounding equipment and glue is relatively fast, and the applicable composite structure is also abundant. With the localization of solvent-free equipment, water glue may be replaced.
、三种胶水各有千秋 4 , three kinds of glue have their own advantages
Shantou Xindacheng Yang Hui:
From the current application perspective, the three types of glue have their own technical advantages and limitations, and no one can replace them. Water glue is most suitable for ordinary aluminized film lamination, and it is easy to operate, does not need curing, low cost, good effect, and is limited to only light packaging product lamination. The alcohol sol process is relatively mature, has high composite strength, the best quality stability and effect, and is basically applicable to products of all structures, but at a higher cost. Solvent-free glue has developed very rapidly in recent years, because it has the advantages of high efficiency, energy saving, saving money, environmental protection, health, and safety, but it requires additional investment in solvent-free composite equipment, and the operator's grasp of the process needs to be improved. For aluminum foil structure and cooking products with high requirements, the solvent-free process is not yet mature. Therefore, no one will replace the three types of glue in the future, only the market share will be different.
Deng Minghui of Guangzhou Yirui New Material Co., Ltd .:
I don't know much about glue, my suggestion is: we should classify the various packaging structures on the market, and then comprehensively consider the environmental protection, energy saving, cost, packaging quality and other factors, and subdivide which glue is more suitable for which packaging Structure, so as to give the industry a scientific and reasonable code or standard. To do this: It requires the joint efforts of glue manufacturers, flexible packaging companies and ink companies, which requires a lot of experimental research. (Including studying the matching between ink and glue)
Chongqing plastic flexible packaging:
I personally think that the choice of glue depends on the product positioning of the enterprise, so as to choose the most suitable glue.
Shen Kai-Wei Yefeng:
Each of the three types of glue has its own advantages and its incompatibility. The key depends on which product is good for the residual amount.
At present, these three glues cannot replace anyone completely for a long time. The future market share is estimated to be three points in the world. The solvent type is basically mature. It is more difficult for water-based adhesives to occupy the market based on the current water-based acrylic system. Water-based polyurethanes must be developed. The quality of solvent-free is also determined according to the actual situation of each plant.
Guangdong Composite Xiao:
Now these three kinds of glue have their own advantages, depending on what the company does and how to use it.
Through your discussions, I believe that you have a deeper understanding of the characteristics of the three glues: under the common environmental advantages, hydrogels have an advantage in the aluminized film composite; alcohol sols have an advantage in the high-temperature cooking ; And solvent-free glue has more cost advantages, and the proportion of use is gradually expanding. Materials and technologies are always at the core of the company's technological innovation and development. Which technology you choose to become your new investment point and new profit growth point requires the company's CEO to consider it in its entirety. Our discussion did not have an absolute conclusion, but just to let everyone understand each other's ideas as much as possible and provide a platform for peer exchange. The more information you have, the more you can weigh the pros and cons and make the right decisions that are in the interest of your business.
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