Environmental protection problems of adhesives and their solutions

With the improvement of environmental awareness and health awareness, industry requirements are becoming more and more stringent! So what are the environmental problems with adhesives? Only with a clear understanding of the types and hazards of pollutants can we try to eliminate and prevent them.
Adhesive pollution source
adhesive environmental protection problems are mainly environmental pollution and human health hazards, due to harmful substances in adhesives, such as toxic and harmful solvents, additives, volatile organic compounds, etc. caused.
Volatile Organic Compounds (VOC)
Sulsive and harmful substances
part of the toxic fillers
The way to solve the environmental problems of adhesives
1, change traditional concepts, enhance environmental awareness
environmental protection is to ensure sustainable economic development and human health survival of the key . The adhesive industry bears a heavy responsibility for the environmental impact, and it would be wise to take strong early action. First of all, it is necessary to change the traditional concept, not only to map the immediate local interests, but to ignore the destruction of the ecological environment, not only the temporary economic benefits, but at the expense of the environment, adhesive industry in the pursuit of economic benefits, but also pay attention to social and environmental benefits, in environmental protection to make new contributions.
2, the development of environmentally friendly adhesives
in order to avoid environmental pollution and ecological damage, the development of low-polluting or non-polluting environmentally friendly adhesives has become imperative. The so-called environmentally friendly green adhesive, refers to the environment pollution-free, non-toxic to the human body, in line with the "environmental protection, health, safety" three requirements of adhesive. In order to meet the needs of society and environmental protection, adhesive varieties should be accelerated replacement, to create environmentally friendly green adhesive, our main task is: to accelerate the promotion of water-based, hot-melt, solvent-free, ultraviolet curing type, high solid content and biodegradable type and other green products, limit the use of harmful solvents, additives.
01, hydration
adhesive hydration is water as a solvent or dispersion medium to make water-based adhesive, because there is no organic solvent, thereby eliminating solvent pollution. Emulsion-type acrylic pressure-sensitive adhesive can replace solvent-based pressure-sensitive gel. Water-based compound film glue has begun to replace solvent-based compound film glue, non-toxic, non-combustion, pollution-free, safe to use. In the polyethylene alcohol (PVA) aqueous solution with isocyanate or pre-polymer, made of vinyl polyurethane emulsion, can replace the formaldehyde glue, completely solve the formaldehyde release problem.
water-based adhesives are favored for non-toxic and non-polluting, but their deficiencies are slow drying speed, poor water resistance and poor antifreeze. The solid part should be increased, the drying speed should be accelerated, and the cross-linking method should be adopted to improve the drying speed and water resistance in order to expand its application.
02, solvent-free
solvent-free refers to the adhesive does not contain solvents, because solvent-free evaporation to the atmosphere, will not cause pollution and harm. The vast majority of epoxy, anaerobic, α-cyanide acrylate adhesive, oxygen-modified acrylate structure adhesive, solvent-free polyurethane glue, photo-curing adhesive are solvent-free varieties.
03, solidification
adhesive solidification is used in solid form, such as hot melt, hot-melt pressure-sensitive glue, water-soluble powder-like glue, reactive rod-like glue, office solid glue rod, etc., in the coating and bonding process are no volatiles released, no environmental pollution at all. Foreign respect for the use of powdered glue, with stable performance, no environmental pollution and other advantages.
04, low toxicity
solvent-based adhesive drying speed, good water resistance, although pollution and toxicity is greater, but at present can not be completely replaced by water-based adhesive, can be used low-toxic or non-toxic solvents, such as ethylene oxide, ethyl acetate, butylone, 1,111chloroethylene, carbonate, such as, to make non-toxic or low-toxic solvent-based adhesive.
3, the use of advanced clean production of new technology
clean production of new technology can achieve economic and environmental benefits of the unity of production environment-friendly adhesives.
(1) abandoned the use of high-flavored methyl acrylates and switched to high-boiling monognesses. Production of modified acrylic fast-fix structure adhesive.
(2) Do not use toxic raw materials such as formaldehyde, chlorinated solvents, aromatic hydrocarbon solvents, fillers containing toxic heavy metals, etc. in the preparation and production of adhesives.
(3) production under non-toxic and harmless conditions, such as the use of polyformaldehyde instead of formaldehyde solution to produce modified amine curing agents.
(4) to add formaldehyde capture agents, such as starch, polyethylene alcohol, melamine, etc., can significantly reduce the content of formaldehyde free formaldehyde resin adhesive. Among them, oxidized starch is better than ordinary starch, which can reduce the free formaldehyde < 0.1%.
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