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Composite elastic chitin whisker material and its prepn and use

A technology of chitin whiskers and elastic materials, which can be applied in sanitary equipment for toilets, medical science, absorbent pads, etc., and can solve the problems of lack of research on the application of chitin whiskers, fragility of pure chitin materials, and lack of use value , to achieve the effect of improving the performance of a single material, excellent mechanical properties, and improving mechanical strength

Inactive Publication Date: 2007-06-06
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitin is not only insoluble and difficult to process, but also pure chitin material is very fragile and lacks use value
[0003] At present, the application of chitin is mainly in the field of food and health care, and other application researches are through blending, derivatization, graft copolymerization and other methods (Progress in Polymer Science, 23, 1273, 1998), and chitin obtained by physical modification Whisker application research has not been carried out (Macromolecules, 35, 2190, 2002)

Method used

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  • Composite elastic chitin whisker material and its prepn and use
  • Composite elastic chitin whisker material and its prepn and use
  • Composite elastic chitin whisker material and its prepn and use

Examples

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preparation example Construction

[0016] 2. Preparation method of chitin whisker composite elastic material

[0017] The method comprises the steps of preparing water-based polyurethane, preparing chitin whisker colloid, and compounding water-based polyurethane and chitin whisker colloid. details as follows:

[0018] 1. Preparation of waterborne polyurethane:

[0019] First, the molar ratio of poly(ethylene glycol oxalate), toluene diisocyanate and 2,2'-dimethylol propionic acid is 1:3:1, and the [NCO] / [OH] of the prepolymer =1.5~1.6; heat up poly(ethylene glycol oxalate) to 85~110°C to melt it; add toluene diisocyanate, react at 80°C for 1~2 hours; then add dried 2,2 ′-Dimethylolpropionic acid, dilute with acetone at the same time, control the reaction temperature at 60-70°C for chain extension for 2-3 hours, then lower the reaction temperature to 45°C, add triethylamine for neutralization, and make the pH of the solution The value is 8; add water and stir for 10-30 minutes to obtain water-based polyuretha...

Embodiment 1

[0032] Preparation of chitin whiskers: control the mass ratio of 2-3 mol / liter hydrochloric acid to chitin at 25-35 ml / g. The viscosity average molecular weight of the chitin is 1.31×10 6 , the degree of acetylation is 92.5%. Add it into a three-necked flask, heat it to boiling under mechanical stirring for 1-2 hours, add water to dilute it and centrifuge it at a speed of 4000-6000 rpm for 5-10 minutes, pour off the supernatant, repeat The above operations were performed twice, and the obtained chitin whiskers were put into a dialysis bag, and then dialyzed with flowing tap water for 8-12 hours, and then deionized water for 4-6 hours, until the pH of the dialyzed water was 7. Then it is subjected to ultrasonic treatment at a frequency of 200-400W, for 2-3 minutes per 40 ml solution, and then filtered to obtain chitin whisker colloid with a mass percentage of 3.30-5.00%.

[0033] Preparation of water-based polyurethane: get 23.8-25.0 grams of polyethylene glycol ester, the we...

Embodiment 2

[0036] The preparation of chitin whiskers and water-based polyurethane are the same as in Example 1.

[0037] Preparation of chitin whisker composite elastic material: mix chitin whisker and water-based polyurethane, the solid content of the mixed solution is 5%, the mass of chitin whisker accounts for 10% of the total mass, and ultrasonic treatment is performed at room temperature at a frequency of 200W 2 minutes. Pour into a glassware, and solidify at 50°C for 12 hours to obtain a chitin elastic material containing 10% chitin whiskers. Its mechanical properties are shown in attached table 1. Its mechanical properties are obviously improved, but the elongation at break is still as high as 473%, which reflects that the mechanical strength of the material is improved due to the addition of chitin whiskers, and it has higher elasticity.

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Abstract

The present invention provides composite elastic chitin whisker material. The composite elastic chitin-whisker material consists of chitin whisker and water thinned polyester type polyurethane compounded together. The preparation process of the composite elastic chitin whisker material includes the following steps: preparing chitin whisker and water thinned polyester type polyurethane as materials, mixing chitin whisker and polyurethane in the weight ratio of 5 to 95-30 to 70 at room temperature to form mixture solution with solid content of 5-8 %, stirring reaction or ultrasonic treatment, and curing at 40-60 deg.c. The prepared composite elastic chitin whisker material has high mechanical strength, high elasticity, bacteriostasis and biodegradability, and may be used in making bacteriostatic utensil, membrane material and medical bandage.

Description

technical field [0001] The invention relates to a preparation method and application of an elastic material, in particular to a chitin whisker composite elastic material and a preparation method and application thereof. Background technique [0002] With the wide application of polymer materials based on petroleum resources in various sectors of industry and agriculture and people's daily life, a large amount of solid waste has also caused increasingly serious environmental pollution and has become a worldwide environmental hazard. Therefore, natural polymers based on renewable animal, plant and microbial resources are attracting increasing attention. They have the characteristics of wide sources and easy degradation, and may become the main chemical raw materials of polymer materials in the future. Chitin is an important marine resource, mainly derived from shrimp shells, crab shells, etc. It has the characteristics of biocompatibility, antibacterial, adsorption function, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04A61L2/00A61L15/00A61L31/12C08L5/08
Inventor 曾鸣李爱萍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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