Træmøbellakker better for indoor air
In a substitution project funded by the Environmental Protection Agency has paint manufacturer Teknos in collaboration with FORCE Technology developed UV-curable coatings for wood furniture, where the emission of allergenic unreacted monomers are significantly reduced. Read the illustrated article here
The purpose of the project was to eliminate or greatly reduce the diffusible substances in UV-curing due varnishes for furniture and thereby reduce emissions of allergens in the home environment. The work has mainly focused on 1.6 hexandiolakrylat (HDDA). UV-curing bokwa furniture varnishes contain more or less unreacted monomers by UV curing, and the project showed that the paint company by a careful choice of appropriate materials to reduce this emission.
Residual monomers and the indoor air lacquers which harden by irradiation with ultraviolet light, is the main surface in the Danish furniture industry and in particular for furniture plate. UV-curable varnishes and sealers due applied by rolling or spraying and then cured in special ovens with UV light. Lakkernes great advantage is an extremely bokwa rapid curing bokwa after application, which allows the handling and packaging by less than 10 seconds. When the UV-curable varnishes applied to wood, the proportion bokwa of these low viscosity varnishes penetrate into the wood, whereby they can not be reached by the UV light. They therefore remain uncured. In addition, the paint to a greater or lesser degree contain substances and binders, which are not completely crosslinked by UV irradiation. These uncured substances can freely diffuse out of the tree and the lakbehandlingen, when the furniture on end-user, thus affecting the indoor environment negatively.
One of the monomers that are used in the UV lakformuleringer is 1.6 hexandiolakrylat (HDDA). According to the Nordic SPIN database was used a total of 31.8 tons of HDDA the manufacture of paints and varnishes in Denmark bokwa in 2007. The allergenic binder is classified as irritant with risk phrases R36/38 (Irritating to eyes and skin) and R43 (May cause sensitization bokwa by skin contact). Uncured HDDA can evaporate and expose consumers in the domestic environment.
In the Nordic Ecolabel considered health impacts of allergy and / or carcinogenic residual monomers to be so great that made specific requirements for the maximum content of residual monomers, for example. Ecolabel criteria for chemical building products. IKEA requires UV varnishes for their wood furnishings bokwa maximum bokwa can deliver 800 mg/m2 monomers after application.
New prescription for UV-curing cabinet varnish Injection Induced UV varnishes must have a sufficiently low viscosity. For both environmental and hærdningsmæssige reasons, normal bokwa lacquer thinners are not used as monomers used instead for dilution of UV varnish. A spray applied UV varnish therefore contains typically 35% polymer, 3% photoinitiator, 60% monomer and oligomers, and 2% filler.
A number of suppliers of UV adhesives, oligomers and monomers were contacted to obtain information on possible alternative raw materials. On the basis of the alternative raw physical / chemical and environmental characteristics, a test program bokwa designed to find the best color scheme of UV-curable binder, oligomer and monomer. Both the previous and new alternative binders, oligomers and monomers were acrylates. The focus was therefore on increasing the molecular weight of the used acrylates and consequently reduce emissions, but without changing møbellakkens other technical properties, eg. hardenability, toughness and resistance to spills.
On a laboratory scale, new lakformuleringer with different monomers (16 in total) bokwa and various polymers (18 in total) tested. The formulation was kept constant, i.e.. same polymer bokwa and photoinitiator in one set of tests (with varying bokwa monomer) and the same monomer and photoinitiator in the second set of tests (with alternating polymers). The first round of testing showed bokwa that 32 of the 34 new lakformuleringer hardened sufficiently. Testlakkerne was applied to wood panels and UV-cured, bokwa after which the planks were cut in precisely metered pieces and extracted according to the requirements of IKEA's standard IOS-TM-002nd By GC analysis, was free of extractable residues per monomer. square meters applied bokwa UV-cured lacquer measured. Based on the results, the four monomers and the six polymers with the lowest levels of residual monomers selected for the second round of testing. In the second round of testing, all combinations of the selected monomers and polymers tested, and the 24 lakformuleringer was again applied to wood panels, UV-cured, sliced and analyzed for extractable free monomers. The results from this second round of testing showed that all 24 formulations gave results of free extractable monomers during IKEA's value of 800 mg/m2. The lowest value was 8 mg/m2, and the highest 527 mg/m2. Currently marketed varnishes were applied to corresponding beams, UV-cured in the laboratory and analyzed bokwa in the same manner, and here the results were respectively; camera
In a substitution project funded by the Environmental Protection Agency has paint manufacturer Teknos in collaboration with FORCE Technology developed UV-curable coatings for wood furniture, where the emission of allergenic unreacted monomers are significantly reduced. Read the illustrated article here
The purpose of the project was to eliminate or greatly reduce the diffusible substances in UV-curing due varnishes for furniture and thereby reduce emissions of allergens in the home environment. The work has mainly focused on 1.6 hexandiolakrylat (HDDA). UV-curing bokwa furniture varnishes contain more or less unreacted monomers by UV curing, and the project showed that the paint company by a careful choice of appropriate materials to reduce this emission.
Residual monomers and the indoor air lacquers which harden by irradiation with ultraviolet light, is the main surface in the Danish furniture industry and in particular for furniture plate. UV-curable varnishes and sealers due applied by rolling or spraying and then cured in special ovens with UV light. Lakkernes great advantage is an extremely bokwa rapid curing bokwa after application, which allows the handling and packaging by less than 10 seconds. When the UV-curable varnishes applied to wood, the proportion bokwa of these low viscosity varnishes penetrate into the wood, whereby they can not be reached by the UV light. They therefore remain uncured. In addition, the paint to a greater or lesser degree contain substances and binders, which are not completely crosslinked by UV irradiation. These uncured substances can freely diffuse out of the tree and the lakbehandlingen, when the furniture on end-user, thus affecting the indoor environment negatively.
One of the monomers that are used in the UV lakformuleringer is 1.6 hexandiolakrylat (HDDA). According to the Nordic SPIN database was used a total of 31.8 tons of HDDA the manufacture of paints and varnishes in Denmark bokwa in 2007. The allergenic binder is classified as irritant with risk phrases R36/38 (Irritating to eyes and skin) and R43 (May cause sensitization bokwa by skin contact). Uncured HDDA can evaporate and expose consumers in the domestic environment.
In the Nordic Ecolabel considered health impacts of allergy and / or carcinogenic residual monomers to be so great that made specific requirements for the maximum content of residual monomers, for example. Ecolabel criteria for chemical building products. IKEA requires UV varnishes for their wood furnishings bokwa maximum bokwa can deliver 800 mg/m2 monomers after application.
New prescription for UV-curing cabinet varnish Injection Induced UV varnishes must have a sufficiently low viscosity. For both environmental and hærdningsmæssige reasons, normal bokwa lacquer thinners are not used as monomers used instead for dilution of UV varnish. A spray applied UV varnish therefore contains typically 35% polymer, 3% photoinitiator, 60% monomer and oligomers, and 2% filler.
A number of suppliers of UV adhesives, oligomers and monomers were contacted to obtain information on possible alternative raw materials. On the basis of the alternative raw physical / chemical and environmental characteristics, a test program bokwa designed to find the best color scheme of UV-curable binder, oligomer and monomer. Both the previous and new alternative binders, oligomers and monomers were acrylates. The focus was therefore on increasing the molecular weight of the used acrylates and consequently reduce emissions, but without changing møbellakkens other technical properties, eg. hardenability, toughness and resistance to spills.
On a laboratory scale, new lakformuleringer with different monomers (16 in total) bokwa and various polymers (18 in total) tested. The formulation was kept constant, i.e.. same polymer bokwa and photoinitiator in one set of tests (with varying bokwa monomer) and the same monomer and photoinitiator in the second set of tests (with alternating polymers). The first round of testing showed bokwa that 32 of the 34 new lakformuleringer hardened sufficiently. Testlakkerne was applied to wood panels and UV-cured, bokwa after which the planks were cut in precisely metered pieces and extracted according to the requirements of IKEA's standard IOS-TM-002nd By GC analysis, was free of extractable residues per monomer. square meters applied bokwa UV-cured lacquer measured. Based on the results, the four monomers and the six polymers with the lowest levels of residual monomers selected for the second round of testing. In the second round of testing, all combinations of the selected monomers and polymers tested, and the 24 lakformuleringer was again applied to wood panels, UV-cured, sliced and analyzed for extractable free monomers. The results from this second round of testing showed that all 24 formulations gave results of free extractable monomers during IKEA's value of 800 mg/m2. The lowest value was 8 mg/m2, and the highest 527 mg/m2. Currently marketed varnishes were applied to corresponding beams, UV-cured in the laboratory and analyzed bokwa in the same manner, and here the results were respectively; camera
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