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Formaldehyde-free composite particleboard with ddgs as core layer and preparation method thereof
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A technology for DDGS and particleboard, which is applied in the field of aldehyde-free composite particleboard and its preparation to achieve the effects of reducing production costs, expanding sources and streamlining the preparation process
Active Publication Date: 2020-05-29
SHANDONG AGRICULTURAL UNIVERSITY
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Zhao Xiaobin (distiller's grains-based reinforcing material for wood-based panels and distiller's grains-based formaldehyde-free adhesive prepared with it, Chinese invention patent, application publication number CN 103725253 A) applied DDGS to the wood-based panel industry to prepare formaldehyde-free adhesives for wood-based panels, but At present, there is no report on DDGS used as raw material to prepare wood-based panel products
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Embodiment 1
[0014] Firstly, extract DDGS with absolute ethanol, the mass ratio of absolute ethanol and DDGS is 5:1, extract for 1 hour (twice), and filter the extracted DDGS through 60 mesh to remove fine dust. Dry the shavings to a moisture content of 10%, add polydiphenylmethane diisocyanate of 5% by weight and stir evenly in the glue mixer, and add polydiphenylmethane diisocyanate of 4% by weight to DDGS at the same time Stir evenly in the glue machine, pave the mixed DDGS and shavings in layers, so that the ratio of shavings, DDGS, and shavings in the bottom layer, core layer, and surface layer is 35:30:35 (weight ratio), forming a certain thickness and density. Uniform slab, spray release agent on the surface of the slab or release the mold with an isolation layer, start hot pressing after pre-pressing, hot-pressing temperature 180°C, hot-pressing time 40s / mm, hot-pressing pressure 4.5MPa, after hot-pressing Cutting, cooling, sanding, edge sawing and other processes are prepared into...
Embodiment 2
[0016] Firstly, extract DDGS with absolute ethanol, the mass ratio of absolute ethanol and DDGS is 5:1, extract for 1 hour (3 times), and filter the extracted DDGS through 60 mesh to remove fine dust. Dry the shavings to a moisture content of 10%, add 5% polydiphenylmethane diisocyanate by weight and stir evenly in the glue mixer, and add 5% polydiphenylmethane diisocyanate by weight to DDGS at the same time. Stir evenly in the glue machine, pave the mixed DDGS and shavings in layers, so that the ratio of shavings, DDGS, and shavings in the bottom layer, core layer, and surface layer is 30:40:30 (weight ratio), forming a certain thickness and density. Uniform slab, the surface of the slab is sprayed with a release agent or released with an isolation layer. After pre-pressing, start hot-pressing. The hot-pressing temperature is 170°C, the hot-pressing time is 45s / mm, and the hot-pressing pressure is 4MPa. Cutting, cooling, sanding, sawing and other processes are prepared into f...
Embodiment 3
[0018] Firstly, extract DDGS with absolute ethanol, the mass ratio of absolute ethanol and DDGS is 5:1, extract for 1 hour (3 times), and filter the extracted DDGS through 60 mesh to remove fine dust. Dry the shavings to a moisture content of 12%, add polydiphenylmethane diisocyanate with a weight ratio of 4%, and stir evenly in the glue mixer, and add DDGS with a weight ratio of 4% polydiphenylmethane diisocyanate to mix the glue Stir evenly in the machine, pave the DDGS and shavings after glue mixing in layers, so that the proportion of shavings, DDGS and shavings in the bottom layer, core layer and surface layer is 40:20:40 (weight ratio), forming a certain thickness and uniform density The surface of the slab is sprayed with a release agent or released with an isolation layer. After pre-pressing, the hot-pressing starts. The hot-pressing temperature is 190°C, the hot-pressing time is 35s / mm, the hot-pressing pressure is 4.5MPa, and the cutting is carried out after hot-press...
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Abstract
The invention relates to a formaldehyde-free composite chipboard using DDGS (distillers dried grains with soluble) as a core and a preparation method thereof. The preparation method is characterized in that the DDGS and the wooden particles are used as the raw materials to be prepared into the chipboard. The preparation method comprises the following steps: corresponding mixing the preprocessed DDGS and the wooden particles with adhesive through an adhesive blender; paving the DDGS mixed with the adhesive and the wooden particles mixed with the adhesive by layers to form a chipboard blank, wherein the wooden particles, the DDGS and the wooden particles are sequentially paved on a bottom layer, a core layer and a surface layer of the chipboard blank during the layered paving so as to form the chipboard blank, and the wooden particles at the bottom layer are as heavy as the wooden particles at the surface layer; spraying a die releasing agent on the surface of the chipboard blank or releasing a die through an isolating layer so as to obtain the formaldehyde-free composite chipboard. According to the preparation method, the residue, namely, DDGS, in the preparation of ethyl alcohol, is used as the material of the core of the chipboard; 20-40% of wooden particles can be replaced by the DDGS after the DDGS are subjected to extraction, so that the source of the raw materials for producing artificial boards can be increased; compared with the wooden particles, the DDGS change a little in shape and size and are sheet-shaped, so that the prepared core structure of the composite chipboard is uniform and dense by being compared with that of a general chipboard, and the internal bond strength of the prepared core structure can be improved by 20-30%; and the product is free from formaldehyde.
Description
technical field [0001] The invention relates to the field of artificial board manufacture, in particular to a formaldehyde-free composite particle board with DDGS as the core layer and a preparation method thereof. Background technique [0002] Traditional particleboard uses wood or wood processing residues as the main raw material, and is made through shaving, drying, sizing, paving, pre-pressing, hot pressing, cutting, cooling, sanding, sawing and other processes. In 2015, my country's particleboard production was 20.3 million cubic meters, with an average annual growth rate of 13.4% in the past 10 years. The adhesives used in particleboards are mainly formaldehyde-based thermosetting resins, and there is a problem of formaldehyde release when bonding particleboards. According to the "Environmental Protection Comprehensive List (2015 Edition)", it does not meet the formaldehyde release limit E1 standard in the "Indoor Decoration Materials Wood-based Panels and Their Produ...
Claims
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Application Information
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