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Using lipid to improve lignocellulosic fibre bonding and dimensional performance

A technology of lignocellulose and fiber, applied in applications, household components, household appliances, etc., can solve the problems of increasing the cost of final products, expensive release agents and release paper, etc.

Inactive Publication Date: 2009-05-06
ALBERTA RES COUNCIL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of internal and external release agents and release paper is expensive when compared to UF-based resins and thus increases the cost of the final product

Method used

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  • Using lipid to improve lignocellulosic fibre bonding and dimensional performance
  • Using lipid to improve lignocellulosic fibre bonding and dimensional performance
  • Using lipid to improve lignocellulosic fibre bonding and dimensional performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Grind grass stalks and refine them under atmospheric pressure or steam pressure, as shown in Table 1. The specific energy consumption during the refining process is about 250 kWh / ton of oven-dried straw.

[0030] Table 1: Preparation method of straw fiber

[0031]

Embodiment 2

[0033]Table 2 lists different recipes for mixing certain percentages of fibers, resins, waxes and oils in high pressure gas lines or in blenders.

[0034] Table 2: Grass straw or wood fiber mixed with different oils

[0035]

Embodiment 3

[0037] Before making the MDF boards, the formulated fibers were analyzed using Inverse Gas Chromatography (IGC) to identify their dispersion and acid-base characteristics before and after oil addition. These characteristics are closely related to fiber bonding behavior according to the acid-base theory.

[0038] IGC measurements and MDF board test results showed significant changes in the dispersion and acid-base characteristics of the fibers, resulting in improved internal bond (IB) and dimensional stability of the board (i.e. less thickness swell (TS) and less water absorption (WA)). Depending on oil and fiber type, internal bond (IB) increased by 9-45% and thickness swell (TS) decreased by 30-72%, while bending properties remained constant or slightly improved.

[0039] IGC measurements at infinite dilution were performed at 50°C. Helium is an inert carrier gas. The probes used in the IGC experiments are shown in Table 3, along with their molecular properties.

[0040] ...

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PUM

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Abstract

About 78.0-91.4% refined lignocellulosic fibres were blended with 8.0-12.0% formaldehyde-based resin, 0.5-2.0% wax and 0.1-8.0% oil in a blowline or a blender before mat forming and panel pressing. Fibres can be from cereal straws or wood species. Wax can be slack or emulsified wax. Oil is selected from different groups including, but not being limited to, vegetable oils, tree oils and any kinds of oils and oil mixtures which consist of fatty acids with 12 to 24 carbon atoms. Inverse Gas Chromatography (IGC) measurement and MDF panel test results have shown that fibre adhesion characteristics have changed significantly, leading to significant panel internal bond (IB) and dimensional stability improvements.

Description

technical field [0001] The present invention relates to methods of adding oily or fatty lipids to lignocellulosic fibers and forming medium density fiberboard (MDF) and other lignocellulosic fiber based composite panels. Background technique [0002] The incompatibility of aldehyde-based resins, including urea-formaldehyde (UF), phenol-formaldehyde (PF) and melamine urea-formaldehyde (MUF), with cereal straw is reflected in the current commercial venture to make boards from these materials. To make particle boards, conventional straw board factories use methyl diphenyl isocyanate (MDI) as a binder. Although MDI is an excellent adhesive and imparts excellent properties to the panels, MDI has some inherent disadvantages, including high cost and low viscosity, which are key issues in the preparation of straw-based non-structural panels. [0003] Another important disadvantage is the tendency of MDI to stick to the extruder plate during the plate pressing process. Various rele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/02
CPCB27N1/0263B27N3/04
Inventor 汪孙国W·韦斯尔希维曲国良
Owner ALBERTA RES COUNCIL INC
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