Pretreatment method of bamboo reinforced material

A technology for reinforcing materials and reinforcing composite materials, applied in the field of bamboo reinforced composite materials, can solve the problems of reducing the tensile strength of bamboo materials, and achieve the effect of improving the tensile strength and producing high-quality raw materials

Inactive Publication Date: 2020-04-17
张毅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the air environment, when the temperature is close to 150°C, the cellulose, hemicellulose, and lignin in bamboo begin to decompose, which will reduce the tensile strength of bamboo raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Process the bamboo material into bamboo slices with a thickness of 0.5-10mm, a width of 1-20mm, and a length equal to the length of the bamboo joints, put the bamboo slices into a stainless steel cage, and send them into a pressure cooker.

[0019] Step 2: drying the bamboo raw material at a temperature of 50-60° C. for 3 hours, and a vacuum degree of 0.1 MPa.

[0020] Step 3: According to the ratio of 2.5% alum and 97.5% water, make alum liquid, pour it into the pressure cooker until it completely submerges the bamboo raw material, cook it in the stainless steel cage with a rotating speed of 20-30 rpm, a pressure of 2.5MPa, and a temperature of 100°C Practice for 4 hours.

[0021] Step 4: Release the pressure, discharge the alum liquid, and dehydrate the stainless steel cage for 15 minutes at a speed of 2000r / min.

[0022] Step 5: dry-steam the bamboo slices at a temperature of 130° C. under normal pressure for 4 hours.

Embodiment 2

[0024] Step 1: Process the bamboo material into bamboo wires with an equivalent diameter of 0.3-1 mm and a length of 5-50 cm, put the bamboo wires into a stainless steel cage, and send them into a pressure cooker.

[0025] Step 2: drying the bamboo silk at a temperature of 50-60° C. for 2 hours, and a vacuum degree of 0.09 MPa.

[0026] Step 3: According to the ratio of 2% alum and 98% water, make alum liquid, pour it into the pressure cooker until the bamboo material is submerged, and cook for 2 hours in a stainless steel cage with a rotating speed of 20-30 rpm, a pressure of 2 MPa, and a temperature of 100°C .

[0027] Step 4: Release the pressure, discharge the alum liquid, and dehydrate the stainless steel cage for 10 minutes at 1800r / min.

[0028] Step 5: dry-steam the shredded bamboo at a temperature of 120° C. under normal pressure for 3 hours.

Embodiment 3

[0030] Step 1: Processing the bamboo material into bamboo fibers with an equivalent diameter of 0.05-0.3mm and a length of 3-15cm, putting the bamboo fibers into a stainless steel cage and sending them into a pressure cooker.

[0031] Step 2: drying the bamboo fiber at a temperature of 50-60° C. for 1 hour, and a vacuum degree of 0.08 MP.

[0032] Step 3: According to the ratio of 1.5% alum and 98.5% water, make alum liquid, pour it into the pressure cooker until the bamboo raw material is submerged, and cook it in the stainless steel cage with a rotating speed of 20-30 rpm, a pressure of 1.5MPa, and a temperature of 100°C 1h.

[0033] Step 4: Release the pressure, discharge the alum liquid, and dehydrate the stainless steel cage for 10 minutes at a speed of 1600r / min.

[0034] Step 5: dry-steam the bamboo fiber, the temperature of the stainless steel cage is 100°C, and the air is ventilated under normal pressure for 1 hour.

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Abstract

The physical and chemical properties of alum are utilized, and the swelling and dry shrinkage principle of substances is applied. Alum is used as a preservative, so that the survival conditions of moulds in bamboo raw materials (including bamboo chips, bamboo canes, bamboo splits, bamboo filaments, bamboo fibers and the like) are eliminated, and the preservative effect is achieved; aluminum hydroxide electrolyzed from alum serves as a flame retardant and is reserved in the bamboo raw material, so the flame retardant effect is achieved. The bamboo raw materials are subjected to boiling-off swelling and then dry-steaming shrinkage, so that the tensile strength of the bamboo raw materials and the force transfer effect between the bamboo raw materials and a composite material matrix are improved. The bamboo raw materials are pretreated, so that the tensile strength of the bamboo raw materials is greatly improved, and the composite material has good anticorrosive and flame-retardant functions, and can be widely applied to manufacturing of various bamboo reinforced composite materials such as bamboo artificial boards, bamboo fiber boards, bamboo-plastic composite materials, bamboo scrimber, bamboo winding pipes and the like and industrial bamboo fiber textiles.

Description

【Technical field】 [0001] The invention belongs to the field of bamboo-reinforced composite materials, and in particular relates to a treatment method for anti-corrosion, flame-retardant and strength-improving bamboo raw materials. 【Background technique】 [0002] The chemical composition of bamboo is mainly composed of cellulose, hemicellulose, lignin, etc. From a physical point of view, cellulose bears longitudinal tensile force, and single bamboo fibers (generally shorter than 3mm) are bonded by hemicellulose to Transmitting longitudinal force, hemicellulose is mixed with lignin to resist longitudinal shear force. In the preparation of composite materials, bamboo raw materials are generally used as tensile reinforcement materials, so in the pretreatment process of bamboo, it is necessary to ensure that cellulose and hemicellulose are not damaged as much as possible. In addition, in the air environment, when the temperature is close to 150°C, the cellulose, hemicellulose, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K9/00B27K3/02B27K3/20B27K3/08B27K5/00
CPCB27K3/0214B27K3/025B27K3/08B27K3/20B27K5/00B27K5/0085B27K9/002B27K2240/20B27K2240/30
Inventor 张毅彭建新
Owner 张毅
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