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A technology for bonding resin and diglycidyl ether, applied in the direction of adhesive type, lignin adhesive, lignocellulosic material adhesive, etc., can solve the problems of long pressing time, high pressing temperature and so on
Pending Publication Date: 2021-02-05
STORA ENSO OYJ
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Problems solved by technology
A problem with the technique described in that article is the long pressing times and high pressing temperatures
Method used
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Embodiment 1
[0024] First, a lignin solution was prepared by adding 182 g of powdered lignin (90% solid content) and 257 g of water to a 1 L glass reactor at ambient temperature, and stirring until the lignin was fully and uniformly dispersed. Then, 60 g of a 50% alkaline solution were added to the lignin dispersion. The composition was stirred for 120 minutes to ensure complete dissolution of the lignin in the alkaline medium.
Embodiment 2
[0026] The adhesive formulation was prepared by mixing 30.3 g of the lignin alkaline solution from Example 1 and 10 g of glycerol diglycidyl ether (Sigma Aldrich) in a beaker for 20 minutes at room temperature using an overhead stirrer.
[0027] The adhesive formulations were tested according to standard test method EN 205:2016. The target binder resin content is 150g / m 2 , spread on one side with a coil applicator. Hot pressing was performed at 150° C. at a pressure of 1.8 MPa. The total pressing time was 5 minutes. All samples were conditioned according to EN12765:2016C2 before evaluation. The average data from the 10 conditioned and unconditioned samples are listed in Table 1 .
[0028] Table 1: Dry Shear Strength and Wet Shear Strength
[0029]
Embodiment 3
[0030] Embodiment 3 (comparative example)
[0031] The adhesive formulation was prepared by mixing 30 g lignin and 30 g glycerol diglycidyl ether in a beaker for 20 minutes at room temperature using an overhead stirrer.
[0032] The adhesive formulations were tested according to standard test method EN 205:2016. The target binder resin content is 150g / m 2 , spread on one side with a coil applicator. Hot pressing was performed at 150° C. at a pressure of 1.8 MPa. The total pressing time was 5 minutes. Most of the samples fell apart after hot pressing. The pressing time was insufficient to fully cure the samples and, moreover, a longer time was required to cure than the system described in Example 2, which fully cured at 5 minutes.
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Abstract
The present invention relates to a process for preparing a bonding resin, wherein lignin is provided in the form of an aqueous solution and is mixed with one or more of glycerol diglycidyl ether, polyglycerol diglycidyl ether, polyglycerol polyglycidyl ether, glycerol triglycidyl ether, sorbitol polyglycidyl ether, alkoxylated glycerol polyglycidyl ether, trimethylolpropane triglycidyl ether, trimethylolpropane diglycidyl ether, polyoxypropylene glycol diglycidylether, polyoxypropylene glycol triglycidyl ether, diglycidylether of cyclohexane dimethanol, resorcinol diglycidyl ether, isosorbidediglycidyl ether, pentaerythritol tetraglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether having 2-9 ethylene glycol units, propylene glycol diglycidyl ether having1-5 propylene glycol units, and / or diglycidyl ether of terminal diol having a linear carbon chain of 3-6 carbon atoms; and optionally one or more additives. The bonding resin is useful, for example in the manufacture of laminates, mineral wool insulation and wood products such as plywood, oriented strandboard (OSB), laminated veneer lumber (LVL), medium density fiberboards (MDF), high density fiberboards (HDF), parquet flooring, curved plywood, veneered particleboards, veneered MDF or particle boards.
Description
technical field [0001] The present invention relates to a process for preparing an adhesive resin, wherein lignin is provided in the form of an aqueous solution and mixed with one or more of the following: glycerol diglycidyl ether, polyglycerol diglycidyl ether, polyglycerol poly Glycidyl ether, glycerin triglycidyl ether, sorbitol polyglycidyl ether, alkoxylated glycerol polyglycidyl ether, trimethylolpropane triglycidyl ether, trimethylolpropane diglycidyl ether, polyoxygen Propylene glycol diglycidyl ether, polyoxypropylene glycol triglycidyl ether, diglycidyl ether of cyclohexanedimethanol, resorcinol diglycidyl ether, isosorbide diglycidyl ether , pentaerythritol tetraglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether with 2-9 ethylene glycol units, propylene glycol diglycidyl ether with 1-5 propylene glycol units, and / or a diglycidyl ether of a terminal diol having a linear carbon chain of 3-6 carbon atoms; and optionally one or mor...
Claims
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Application Information
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