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Elastic material containing nitrated casing glycan, its preparing method and use thereof

A technology of nitrated chitosan and elastic materials, which is applied in the direction of chitin polysaccharide coatings and hyaluronic acid coatings, can solve the problems that the application research of nitrated chitosan has not been carried out, and achieve tight interface bonding, which is conducive to environmental protection and technology. The effect of high content

Inactive Publication Date: 2005-02-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of chitosan is mainly through methods such as blending, derivatization, and graft copolymerization (Polymer Degradation and Stability, 59, 117, 1998), but no research on the application of nitrated chitosan has been carried out.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] Preparation of nitrated chitosan:

[0015] Add 1-5 grams of chitosan to 100-150 ml of concentrated nitric acid cooled by ice-salt water, add 100-150 ml of acetic anhydride dropwise under mechanical stirring, and drop it within 10 minutes; after 4-6 hours of reaction, the reaction The solution was poured into ice water to terminate the reaction to obtain nitrated chitosan; the weight average molecular weight of chitosan used was 10×10 5 -100×10 5 .

[0016] Preparation of polyester polyurethane prepolymer:

[0017] Take 66.5-70.0 grams of poly(ethylene glycol oxalate), heat it up to 85-110°C to melt it, then add 11.6-22.0 grams of 2,4-toluene diisocyanate dropwise, and drop it within 10 minutes; the reaction control React at 90-120°C for 2-4 hours; then add 3.50-4.40 grams of 2,2'-dimethylolpropionic acid for chain extension for 1-2 hours, then cool down to room temperature, add 90-120 grams of tetrahydrofuran and stir Dilution down makes polyester polyurethane prepo...

Embodiment 1

[0019] 6 grams of polyester polyurethane prepolymer, 0.25 grams of nitrated chitosan and 0.15 grams of 1,1,1-trimethylolpropane were respectively dissolved in tetrahydrofuran to adjust the total solid content to 15%, and then mixed and stirred for 30 minutes. Pour into a glass mold and cure at 40°C for 12 hours to obtain a semi-interpenetrating polymer network material containing 10% nitrated chitosan. Its mechanical properties are shown in attached table 1. Its elongation at break is as high as 742%, which reflects the characteristics of an elastomer, and its tensile strength is also very high, which greatly broadens the application field of functional materials.

Embodiment 2

[0021] 6 grams of polyester polyurethane prepolymer, 0.25 grams of nitrated chitosan and 0.15 grams of 1,1,1-trimethylolpropane were respectively dissolved in tetrahydrofuran to adjust the total solid content to 15%, and then mixed and stirred for 30 minutes. Pour into a glass mold and cure at 60°C for 12 hours to obtain a semi-interpenetrating polymer network material containing 10% nitrated chitosan. Its mechanical properties are shown in Attached Table 1. Its elongation at break is as high as 319%, reflecting the characteristics of an elastomer, and its tensile strength is also very high, which greatly broadens the application field of functional materials.

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Abstract

An elastic material containing nitrated chitin is produced from polyurethane prepolycondensate, nitrated chitin and 1,1,1-trimethylol propane by stirring and reacting in tetrahydrofuran, curing at 18 - 100deg.C for 4 - 24h. It has good mechanical strength, elasticity and bio-degradation, is easily and simply produced to be coating materials, utensils or films in medical, chemical, environment-protective or daily-used fields.

Description

technical field [0001] The invention relates to a preparation method and application of a natural polymer semi-interpenetrating polymer network elastic material, which is a functional material prepared from polyester polyurethane and nitrated chitosan. It belongs to the field of functional polymers and also belongs to the field of natural polymer chemistry. Background technique [0002] The extensive use of synthetic polymer materials based on petroleum resources has caused environmental pollution, and will face the threat of gradual depletion of petroleum resources in 70 years. Natural polymers based on renewable animal, plant and microbial resources will likely become the main chemical raw materials for future polymer materials. Chitin is an important marine biological resource, and its total output is about 150,000 tons per year, mainly from shrimp shells, crab shells, insect shells, etc. Chitosan is the product of removing more than 55% of the N-acetyl groups from chit...

Claims

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Application Information

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IPC IPC(8): C08J9/00C08L5/08C08L31/06C09D105/08
Inventor 张俐娜曾鸣
Owner WUHAN UNIV
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