Surface-Core-Surface Corn Straw Ecological Board for Water Resistance
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Solution Overview
Problem
Corn straw boards exhibit high water absorption and low strength due to loose fibers, leading to deformation and reduced durability.
Innovation Solution
A method involving mixing corn straw powder with an enzyme-modified soybean adhesive, hydrophobic agent, and binder, followed by controlled drying and sequential pre-pressing and hot-pressing to create a surface-core-surface structure with varying moisture contents, enhancing density and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If corn straw is used as raw material for board materials, then forest resource pressure is reduced, but board strength is low due to loose fibers
Solution Approach 1:
The patent uses composite materials by combining corn straw particles with formaldehyde resin adhesive and other additives to create a board that maintains the benefits of corn straw while achieving sufficient strength through the composite structure
Solution Approach 2:
The patent changes parameters such as particle size distribution, moisture content, and pressing conditions to optimize the board's mechanical properties while maintaining its ecological benefits
2Adaptability or versatility
If corn straw fibers are used in board production, then renewable resource utilization is improved, but water absorption is high leading to deformation
Solution Approach 1:
The patent changes the moisture content parameter during processing and uses additives that modify the hydrophobic properties of the board to reduce water absorption and improve dimensional stability
Solution Approach 2:
The patent uses formaldehyde resin adhesive and other additives as intermediary substances that bond the corn straw particles together and provide water resistance, mediating between the natural properties of corn straw and the required performance characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a corn straw ecological board with low water absorption, high strength, and formaldehyde-free composition, achieving a density of 0.96 g/cm³, modulus of rupture of 18.2 MPa, and modulus of elasticity of 2,865 MPa.
Implementation Method 1
the sizing material includes an enzyme-modified soybean adhesive
Implementation Method 2
the sizing material includes an enzyme-modified soybean adhesive, a hydrophobic agent, and a binder
Implementation Method 3
subjecting a resulting system to pre-pressing and hot-pressing in sequence
Implementation Method 4
subjecting a resulting system to pre-pressing and hot-pressing in sequence
Implementation Method 5
drying the surface wet material and the core wet material obtained in step (1) respectively
Data Source
AI summary
A corn straw ecological board and a preparation method thereof are provided. The preparation method includes: (1) mixing a corn straw powder and a sizing material to obtain a mixed material, and then dividing the mixed material into a surface wet material and a core wet material; (2) drying the surface wet material and the core wet material obtained in step (1) respectively to obtain a surface material and a core material, wherein the surface material has a moisture content of 25% to 30%, and the core material has a moisture content of 10% to 15%; and (3) laying the core material and the surface material obtained in step (2) in a surface-core-surface manner, and then subjecting a resulting system to pre-pressing and hot-pressing in sequence to obtain the corn straw ecological board.