Wood-based high strength elastic composite gel and preparation method thereof

A composite gel and high-strength technology, applied in the manufacture of tools, wood treatment, wood heating, etc., can solve the problems of high moisture content, poor mechanical properties, limited application range, etc., to improve interface bonding and tensile strength Effect

Pending Publication Date: 2019-11-05
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyacrylamide gel has similar elasticity and flexibility to human soft tissue, can exist stably in aqueous solution system, and has good biocomp

Method used

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  • Wood-based high strength elastic composite gel and preparation method thereof
  • Wood-based high strength elastic composite gel and preparation method thereof
  • Wood-based high strength elastic composite gel and preparation method thereof

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preparation example Construction

[0028] The following are the specific steps of the wood-based high-strength gel preparation method of the present invention:

[0029] 1) Extract wood fiber skeleton: put 3 pieces of balsa wood chips (density: 0.16-0.2g / cm3) in 200-400ml 2wt%-3wt% sodium chlorite solution with longitudinal section of 30mm×30mm×1mm, and use acetic acid to adjust the pH Heating at 4-5, 90-100°C for 2-4 hours for delignification of balsa wood. Then rinse with deionized water, fully rinse the obtained wood fiber skeleton to neutrality, and store in ethanol.

[0030] Afterwards, the specific method of treating the wood fiber skeleton with sodium hydroxide solution is: soak the wood fiber skeleton in 15-18 wt% sodium hydroxide solution for 1-3 hours at 25-40°C, and the resulting sodium hydroxide treatment The final wood fiber skeleton was washed with water to neutrality and stored in ethanol.

[0031] 2) Prepare acrylamide solution: put the weighing paper on the weighing balance, clear to zero, wei...

Embodiment 1

[0044] 1) Put three pieces of balsa wood chips (density: 0.16-0.2g / cm3) with longitudinal section of 30mm×30mm×1mm in 200ml, 2 wt% sodium chlorite solution, adjust the pH to 4 with acetic acid, and heat at 90°C for 4 Hours, the balsa wood is delignified. Then rinse with deionized water, fully rinse the obtained wood fiber skeleton to neutrality, and store in ethanol.

[0045] The specific method for treating the wood fiber skeleton with sodium hydroxide solution is: soak the wood fiber skeleton in 18wt% sodium hydroxide solution for 2 hours at 25°C, and rinse the wood fiber skeleton with water to neutral after the sodium hydroxide treatment. , stored in ethanol.

[0046] 2) Put the weighing paper on the weighing balance, reset to zero, weigh 2.766g of acrylamide monomer, pour it into a beaker, then measure 4g of water with a measuring cylinder, pour it into the beaker, and stir. Next, 0.025 g of the cross-linking agent N,N-methylenebisacrylamide was weighed and added into th...

Embodiment 2

[0050] 1) Put three pieces of 30mm×30mm×2mm balsa wood chips in 400ml, 2 wt% sodium chlorite solution, adjust the pH to 5 with acetic acid, and heat at 100°C for 4 hours to delignify the balsa wood. Then rinse with deionized water, fully rinse the obtained wood fiber skeleton to neutrality, and store in ethanol.

[0051] The specific method of treating the wood fiber skeleton with sodium hydroxide solution is: soak the wood fiber skeleton in a sodium hydroxide solution with a concentration of 18wt% at 25°C for 3 hours, and rinse the wood fiber skeleton with water to Neutral, stored in ethanol

[0052] 2) Put the weighing paper on the weighing balance, reset to zero, weigh 2.849g of acrylamide monomer, pour it into a beaker, then measure 4g of water with a measuring cylinder, pour it into the beaker, and stir. Next, 0.033 g of the cross-linking agent N,N-methylenebisacrylamide was weighed and added into the beaker. Then weigh 0.016g of initiator potassium peroxodisulfate, mea...

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Abstract

The invention discloses a wood-based high strength elastic composite gel and a preparation method thereof. The preparation method comprises the following steps: (1) extracting a wood fiber skeleton: placing wood pieces in a sodium chlorite solution, performing heating to remove, washing the obtained wood pieces with deionized water to obtain the wood fiber skeleton, then impregnating the wood fiber skeleton in a sodium hydroxide solution, and washing the impregnated wood fiber skeleton until neutrality in order to obtain a sodium hydroxide pretreated wood fiber skeleton; (2) preparing an acrylamide solution: sequentially adding a cross-linking agent and an initiator to an aqueous acrylamide solution, and performing stirring and mixing to uniformly; and (3) preparing the composite gel: impregnating the wood fiber skeleton in the acrylamide solution at 25 DEG C, and performing heating under a vacuum condition to initiate a crosslinking reaction in order to obtain the composite gel. The preparation method of the invention can improve the interfacial bonding property between the wood fiber skeleton and the polyacrylamide, and the prepared elastic wood gel has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of wood composite material processing, and in particular relates to a wood-based high-strength elastic composite gel and a preparation method thereof. Background technique [0002] Hydrogel is a swelling body formed by chemical bonds or physical forces between polymer chain segments. In its cross-linked network structure, hydrophilic groups are easy to combine with water molecules to form hydrogen bonds, and have good water retention. ability. At present, polymer gels are mainly used in water treatment, industry and agriculture, biomedical fields, and flexible device substrates. Polyacrylamide gel has similar elasticity and flexibility to human soft tissue, can exist stably in aqueous solution system, and has good biocompatibility. However, due to its high water content, its mechanical properties are poor, which is extremely This greatly limits its scope of application. Therefore, how to improve the mecha...

Claims

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Application Information

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IPC IPC(8): B27K3/04B27K5/00C08F289/00C08F220/56C08F222/38
CPCB27K3/04B27K5/001C08F289/00C08F220/56C08F222/385
Inventor 陈楚楚王怡仁吴启静张影闫姝玥李大纲
Owner NANJING FORESTRY UNIV
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