Carbonized Shaving Cement Board Mildew Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cement particle boards used for external wall decoration and outdoor furniture are prone to mildew and rot due to hydrolysis of hemicellulose under water and heat conditions, leading to reduced mechanical strength and durability.
Innovation Solution
A method involving sequential carbonization and water-washing of shavings, followed by mixing with a cement gelling agent and curing agent, molding, curing, and drying to create a mildewproof and antirot high-strength cement particle board, which degrades hemicellulose and creates micropores for enhanced cement bonding, preventing microbial growth and improving mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wood or non-wood shaving is used as reinforcing material in cement particle board, then mechanical strength is improved, but mildew and rot resistance deteriorates due to hemicellulose hydrolysis providing carbon source for microbes
Solution Approach 1:
The patent applies carbonization treatment to the shaving to convert the harmful hemicellulose and small molecular saccharide compounds into carbonized materials that resist microbial degradation. This transforms the original harmful property (providing carbon source for microbes) into a beneficial property (microbial resistance) while preserving the reinforcing function of the shaving in the cement particle board
Solution Approach 2:
The patent changes the chemical composition parameters of the shaving through carbonization treatment, specifically reducing hemicellulose and small molecular saccharide content. This parameter change eliminates the carbon source that microbes need for growth, thereby resolving the contradiction between maintaining mechanical strength and improving mildew/rot resistance
2Stability of the object's composition
If shaving with hemicellulose content is used in cement particle board, then board flexibility and bonding are improved, but durability deteriorates due to hydrolysis under water and heat conditions
Solution Approach 1:
The carbonization treatment converts the hemicellulose that causes durability problems under water and heat conditions into carbonized material that is stable and resistant to degradation. This transforms the harmful hydrolysis-prone composition into a beneficial stable composition that maintains durability
Solution Approach 2:
The patent applies carbonization treatment as a preliminary action before manufacturing the cement particle board. This preliminary treatment prevents the subsequent hydrolysis and degradation that would occur under water and heat conditions, thereby ensuring long-term durability while maintaining bonding stability
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 effectively prevents mildew and rot, significantly enhancing the mechanical strength and durability of cement particle boards, thereby extending their service life.
Implementation Method 1
the carbonization treatment is a superheated steam carbonization treatment, and the pressure of superheated steam is 0.2-0.5 MPa; the carbonization treatment includes a first stage and a second stage in sequence; the temperature of the first stage is 100-109° C., and the time is 0.5-1 h; the temperature of the second stage is 150-190° C., and the time is 2-4 h
Implementation Method 2
mixing the obtained carbonized shaving with a cement gelling agent, a curing agent aqueous solution and water to obtain a mixture
Implementation Method 3
the curing agent in the curing agent aqueous solution has a mass concentration of 10%, and the curing agent is CaCl2; sequentially curing and drying the pre-molded material to obtain the mildewproof and antirot high-strength cement particle board
Implementation Method 4
the temperature of the drying in the step (3) is 80-90° C.; the moisture content of the mildewproof and antirot high-strength cement particle board is 9%-10%
Data Source
AI summary
Technical fields of building external wall decoration and material manufacturing, providing a mildewproof and antirot high-strength cement particle board and a preparation method thereof. The preparation method includes: (1) sequentially carbonizing and water-washing a shaving, and mixing the obtained carbonized shaving with a cement gelling agent, a curing agent aqueous solution and water to obtain a mixture; (2) molding the mixture to obtain a pre-molded material; and (3) sequentially curing and drying the pre-molded material to obtain the mildewproof and antirot high-strength cement particle board. Compared to ordinary cement particle board, which is not subjected to carbonization treatment and water-washing, the cement particle board of the present invention can effectively avoid mildew and rot, and can significantly improve the mechanical strength and durability thereof, helping to extend the service life of the cement particle board.