Chitosan-calcium hydroxide composite and its preparation and application as stiffener for paper

A technology of calcium hydroxide and composite materials, applied in textiles, papermaking, papermaking, paper coatings, etc., can solve the problems of limited enhancement of paper mechanical properties, increased cost of reinforcing agent, increased difficulty of spraying, etc.

Active Publication Date: 2015-06-24
安徽金兄弟环保科技股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Sun Zhenqian et al. ("Chemical and Biological Engineering" 2005, (1): 39-41) reported that hydroxypropyl chitosan has a better reinforcement effect on paper cultural relics; Cao Yuhong et al. ("China Paper" 2008, (27): 32-35) reported that cellulose-chitosan grafts can improve the folding endurance and tensile strength of paper cultural relics, and have a good protective effect; Qiu Jianhui et al. ("Journal of Nanjing University of Aeronautics and Astronautics" 2006, (38 ): 126-130) reported a multifunctional reinforcement glue prepared by modified fluororesin, hydroxy chitosan and modified nanomaterials, which has the functions of thickening fibers, powdering and consolidating, embrittlement reinforcement, mildew and antibacterial, etc. A variety of protective functions; patent CN103276627A discloses that the compound of hydroxyethyl cellulose, nano-magnesium hydroxide and nano-titanium dioxide can strengthen the tensile strength of paper cultural relics, improve acid corrosion resistance and antibacterial performance, but the tensile strength of this compound The strength has increased by 28.5% on the original basis, and the enhancement of the mechanical properties of paper is relatively limited
There are also researchers who use composite natural polymers as reinforcement materials for paper documents. Patents ZL201110329836 and ZL201110304943 disclose artemisia polysaccharide-guar gum and konjac polysaccharide-chitosan blends for the protection of paper documents. It can improve the mechanical properties of the paper. After reinforcement, the tensile strength is 0.67~1.13kN / m, and the folding endurance is 1.2~1.75. However, the use of composite polymers is prone to gelation, which increases the difficulty of spraying, making composite materials It is difficult to achieve a uniform surface of the paper, in addition, it will increase the cost of the strengthening agent

Method used

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  • Chitosan-calcium hydroxide composite and its preparation and application as stiffener for paper
  • Chitosan-calcium hydroxide composite and its preparation and application as stiffener for paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of calcium hydroxide: Add 4.1625g of calcium chloride to 50mL of ethylene glycol, and stir at 70°C for 20min at a speed of 800rpm to obtain an ethylene glycol solution of calcium chloride. At 150~180°C, add 50mL of 1.5mol / L NaOH solution dropwise (drop at a rate of 0.5 mL / min) to the above-mentioned ethylene glycol solution of calcium chloride, and stir at 800rpm for 15min , After cooling to room temperature, suction filtration at 0.06MPa to obtain a filter cake. Put the filter cake in 100mL isopropanol, disperse for 30min at ultrasonic power of 150W and temperature of 60°C, centrifuge at 10000rpm for 15min, collect the lower sediment, repeat the above steps 4 times, and then put the lower sediment at -60 Freeze-dry at ℃ and 3Pa for 24 hours to obtain calcium hydroxide. The prepared calcium hydroxide has a particle size of 746nm and a particle size distribution of 0.305.

[0027] (2) Preparation of chitosan solution: Weigh 480mg of chitosan, put it in ...

Embodiment 2

[0032] (1) Preparation of calcium hydroxide: Add 1.3875g of calcium chloride to 50mL of ethylene glycol, and stir at 80°C for 30 min at 400 rpm to obtain an ethylene glycol solution of calcium chloride. At 150°C, add 50 mL of 0.5 mol / L NaOH solution dropwise (dropping at a rate of 0.8 mL / min) to the above-mentioned ethylene glycol solution of calcium chloride, stir at 1000 rpm for 30 min, and cool After reaching room temperature, suction filter at 0.08 MPa to obtain a filter cake. Put the filter cake in 80 mL of isopropanol, disperse for 60 minutes at an ultrasonic power of 180 W, and a temperature of 50 ° C, then centrifuge at a speed of 9000 rpm for 10 minutes, collect the lower layer of sediment, repeat the above steps 5 times, and then put the lower layer of sediment in - Freeze-dry at 55°C and 1Pa for 12 to 24 hours to obtain calcium hydroxide. The particle size of the prepared calcium hydroxide is 631nm, and the particle size distribution is 0.163.

[0033] (2) Prepara...

Embodiment 3

[0038] (1) Preparation of calcium hydroxide: Add 2.775g of calcium chloride to 50mL of ethylene glycol, and stir at 90°C for 15min at a speed of 600rpm to obtain an ethylene glycol solution of calcium chloride. At 180°C, add 50mL of 1mol / L NaOH solution dropwise (drop at a rate of 1 mL / min) to the above-mentioned ethylene glycol solution of calcium chloride, and stir at 500rpm for 15-40min, After cooling to room temperature, suction filter at 0.07MPa to obtain a filter cake. Put the filter cake in 90mL of isopropanol, disperse for 45min at ultrasonic power of 100~180W, temperature of 55°C, centrifuge at 8000rpm for 20min, collect the lower precipitate, repeat the above steps 3 times, and finally put the lower precipitate in Freeze-dry at -50°C and 5Pa for 18 hours to obtain calcium hydroxide. The particle size of the prepared calcium hydroxide is 678nm, and the particle size distribution is 0.223.

[0039] (2) Preparation of chitosan solution: weigh 600mg of chitosan, put it...

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Abstract

The invention belongs to the technical field of biological polymer materials and relates to preparation of chitosan-calcium hydroxide composite. The chitosan-calcium hydroxide composite is prepared by evenly dispersing chitosan into acetic acid solution, evenly dispersing calcium hydroxide powder and performing full dispersion under the ultrasonic condition. The chitosan in the chitosan-calcium hydroxide composite is well compatible with the paper, has a small physicochemical property difference with paper fiber, is friendly to paper relics and is well permeable and infiltrative to the paper fiber; the calcium hydroxide can absorb CO2 in air, generating calcium carbonate which has the effect of stopping reaction between the air and the paper, the paper has better ageing resistance and better performance, no obstruction is caused to character recognition, and the texture of the paper is unaffected. Therefore, the chitosan-calcium hydroxide composite as novel stiffening material for paper documents is used for protecting the paper documents and has promising application prospect.

Description

technical field [0001] The invention relates to the preparation of a chitosan-calcium hydroxide composite material, which belongs to the technical field of biopolymer materials; the invention also relates to the application of the composite material—as a paper reinforcement agent applied to paper documents and cultural relics conservation and restoration. Background technique [0002] Paper documents and cultural relics are an important part of Chinese historical relics. They are precious documents for studying Chinese history and even world history and ancient art, and have extremely important research value. Paper cultural relics handed down from generation to generation or unearthed over time, due to factors such as mold growth, immersion hydrolysis, gas erosion, mechanical wear, dust coverage, etc., have caused yellowing, mildew, pulverization, brittle fracture, decay and fragmentation, and stains all over the surface. It can't even be flipped, which greatly reduces ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H25/18D21H19/14
Inventor 王俊龙吕弘丁玉竹成珊杜丽阳段晓敏霍娇娇姚健张继
Owner 安徽金兄弟环保科技股份有限公司
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