Self-bacterial lactic acid-based waterborne polyurethane, its preparation method and its emulsion

A water-based polyurethane and lactic acid-based technology, applied in the field of functional polymer materials, can solve the problems that water-based polyurethane has no antibacterial effect, destroy the antibacterial effect of cell surface structure, hinder the action of cell lysozyme, etc., and achieve significant antibacterial performance, and Good stability and long-lasting antibacterial effect

Active Publication Date: 2022-07-26
XIAOGAN ESUN NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toxicity of quaternary ammonium salts with long alkyl chains decreases with the increase of the chain. When the number of carbon atoms in the alkyl chain is greater than 16 or less than 10, the antibacterial effect is very small. Only when the number of carbon atoms is 14, the antibacterial ability is only To maximize, and long-term use of quaternary ammonium antibacterial agents will cause bacteria to develop resistance, and the decomposition products will have certain toxicity, which is not good for the environment
Patent CN109575235A discloses a water-based polyurethane modified by antibacterial agent PHMG. However, since PHMG is bonded to the main chain of polyurethane, it cannot ionize positive charges and thus adsorb to the surface of negatively charged microorganisms, hindering the action of cell lysozyme and destroying Cell surface structure to achieve antibacterial effect
Patent CN107652663A provides a preparation method of antibacterial modified polyurethane material, which uses formic acid to acidify chitin to form a salt, and connects chitin to the end of polyurethane to form a good antibacterial effect. However, the solvent used in this method is DMF, which belongs to Solvent-based polyurethane is unfavorable to the environment, and the hydrophilicity of the material itself is not yet clear
Patent CN107236109B uses citric acid to modify chitosan, and rationally designs the modified chitosan molecules into the water-based polyurethane structure, and combines the advantages of water-based polyurethane mechanical properties with the biodegradability of chitosan to synthesize A water-based polyurethane containing chitosan structure, however, the water-based polyurethane does not mention antibacterial effect

Method used

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  • Self-bacterial lactic acid-based waterborne polyurethane, its preparation method and its emulsion
  • Self-bacterial lactic acid-based waterborne polyurethane, its preparation method and its emulsion
  • Self-bacterial lactic acid-based waterborne polyurethane, its preparation method and its emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of Chitosan-lactone-BT-PU Self-bacterial Lactic Acid-Based Waterborne Polyurethane Emulsion

[0049] Step 1. Preparation of Chitosan-lactone

[0050] Weigh 17.52g of chitosan and dissolve it in DCM solvent containing 0.5% acetic acid. After the solution is clarified, add 51.34g of lactose, stir at room temperature for 6h, and then add 6.59g of NaBH. 3 CN continued to react for 48h. After the reaction was over, the solid was filtered out, washed with MeOH and dried to finally obtain the water-soluble chitosan Chitosan-lactone. The specific synthetic route is as follows:

[0051]

[0052] Step 2. Preparation of BT-PU

[0053] Weigh 20.88g of lactic acid-based polyol (hydroxyl value 53.72mgKOH / g) in a reaction flask, heat to 100°C for vacuum dehydration for 45min, then cool to 70°C, add 0.014g of stannous octoate, and slowly dropwise add 11.99 g diphenylmethane diisocyanate, after the dropwise addition, react at this temperature for 2 hours to reach the t...

Embodiment 2

[0056] Example 2 Preparation of Chitosan-maltose-BT-PU Self-Bacterial Lactic Acid-Based Waterborne Polyurethane Emulsion

[0057] Step 1. Preparation of Chitosan-maltose

[0058] 17.52g of chitosan was weighed and dissolved in THF solvent containing 0.5% acetic acid. After the dissolution was clarified, 51.34g of maltose was added. The reaction was stirred at room temperature for 6h, and then 3.97g of NaBH was added. 4 The reaction was continued for 48 hours, and after the reaction was over, the solid was filtered out, washed with MeOH and dried to finally obtain the water-soluble chitosan Chitosan-maltose. The specific synthetic route is as follows:

[0059]

[0060] Step 2. Preparation of BT-PU

[0061] Weigh 20.46g of lactic acid-based polyol (hydroxyl value is 54.83mgKOH / g) in a reaction flask, heat to 100°C for vacuum dehydration for 45min, then cool to 70°C, add 0.014g of dibutyltin dilaurate, and slowly dropwise add ,8.06g hexamethylene diisocyanate, after the dro...

Embodiment 3

[0065] Example 3 Preparation of Chitosan-D-ribose-BT-PU Self-Bacterial Lactic Acid-Based Waterborne Polyurethane Emulsion

[0066] Step 1. Preparation of Chitosan-D-ribose

[0067] Weigh 17.52g of chitosan and dissolve it in MeCN solvent containing 0.5% acetic acid. After the solution is clarified, add 22.51g of D-ribose, stir at room temperature for 6h, and then add 22.22g of NaB(OAc) 3 H continued the reaction for 48h. After the reaction, the solid was filtered out, washed with MeOH and dried to finally obtain the water-soluble chitosan Chitosan-D-ribose. The specific synthetic route is as follows:

[0068]

[0069] Step 2. Preparation of BT-PU

[0070] Weigh 19.90g of lactic acid-based polyol (hydroxyl value is 56.38mgKOH / g) in a reaction flask, heat to 100°C for vacuum dehydration for 45min, then cool to 70°C, add 0.014g of bis(dodecyl sulfide) dibutyltin , and slowly added dropwise, 10.65g of isophorone diisocyanate, after the dropwise addition, reacted at this temp...

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Abstract

The invention belongs to the technical field of functional polymer materials, and in particular relates to a self-bacterial lactic acid-based aqueous polyurethane, a preparation method thereof and an emulsion thereof. In the present invention, water-based chitosan and juniper alcohol structures are introduced into the side chain of the large polyurethane long chain from the antibacterial lactic acid-based water-based polyurethane and evenly distributed, so that the two substances with different antibacterial and biocidal mechanisms can produce synergistic effects of biocide and antibacterial. It can effectively reduce the drug resistance of bacterial organisms, and at the same time, the two are grafted on the long chain of polyurethane in the form of chemical bonds, and the antibacterial is durable.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials, and in particular relates to a self-antibacterial lactic acid-based aqueous polyurethane, a preparation method thereof and an emulsion thereof. Background technique [0002] Waterborne polyurethane is a new type of polymer synthetic material that uses water instead of organic solvent as a dispersing medium. It has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. It has been widely used in leather, textile, paint, etc. , printing, construction, adhesives and other fields. [0003] Chitosan is the product of natural polysaccharide chitin removing part of the acetyl group. It is rich in resources and is a recyclable renewable resource with good biodegradability, biocompatibility, non-toxicity, and bacteriostatic properties. Chitosan is insoluble in water and general organic solvents, so it is rar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/64C08G18/42C08G18/32C08G18/12C08B37/08
CPCC08G18/428C08G18/6484C08G18/6735C08G18/3855C08G18/3206C08G18/12C08B37/003C08G18/64
Inventor 杨义浒周行贵陈锐湛露
Owner XIAOGAN ESUN NEW MATERIAL
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