Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of high tensile strength nylon cs blend film

A high tensile strength, blended film technology, applied in the field of preparation of high tensile strength nylon CS blend film, can solve the problems of loss of natural polymer properties, complex process, CS molecular chain scission, etc. Mixing effect, low cost, effect of improving compatibility

Active Publication Date: 2018-07-24
NINGBO UNIVERSITY OF TECHNOLOGY
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method is complicated, and the grafting modification process is likely to cause the chain scission behavior of CS molecular chains, which greatly loses the original characteristics of natural polymers.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of high tensile strength nylon cs blend film
  • A kind of preparation method of high tensile strength nylon cs blend film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 0.5 g of nylon 6 with a molecular weight of 10000 g / mol was dissolved in 10 ml of formic acid to obtain a film-forming mother solution. Adding chitosan with a molecular weight of 10000g / mol to the mother liquor, a deacetylation degree of 95%, and a weight ratio of chitosan to nylon of 50%, stirred for 24 hours, and stood still for 8 hours; the mother liquor was placed on a conductive film-forming flat plate; the film-forming The flat plate is placed in a parallel plate electric field, and an electric field is applied on both sides of the surface dish. The upper plate of the conductive film-forming flat plate is negatively charged, and the lower plate of the conductive film-forming flat plate is grounded. , frequency 50Hz. After the solvent evaporated, a nylon / chitosan blend film was obtained. The obtained blend film has a tensile strength of 100 MPa and an elongation at break of 75%.

Embodiment 2

[0026] 0.5 g of nylon 66 with a molecular weight of 100,000 g / mol was dissolved in 500 ml of formic acid to obtain a film-forming mother solution. Adding chitosan with a molecular weight of 200000g / mol to the mother liquor, a deacetylation degree of 70%, and a weight ratio of chitosan to nylon of 10%, stirred for 72 hours, and stood still for 4 hours; the mother liquor was placed on a conductive film-forming flat plate; the film-forming The flat plate is placed in a parallel plate electric field, and an electric field is applied on both sides of the surface dish. The upper plate of the conductive film-forming flat plate is negatively charged, and the lower plate of the conductive film-forming flat plate is grounded. The AC voltage field strength is 30kV / m, and the electric field frequency is 0.01Hz. After the solvent evaporated, a nylon / chitosan mixed film was obtained. The tensile strength of the obtained composite film reaches 215MPa, and the elongation at break reaches 175%...

Embodiment 3

[0028]0.5 g of nylon 1010 with a molecular weight of 1000 g / mol was dissolved in 0.5 ml of formic acid to obtain a film-forming mother solution. Adding molecular weight to mother liquor is 2000g / mol chitosan, degree of deacetylation is 80%, the weight ratio of chitosan and nylon is 90%, after stirring for 72h, stand still for 6h; Mother liquor is placed on conductive film-forming plate; The flat plate is placed in a parallel plate electric field, and an electric field is applied on both sides of the surface dish. The upper plate of the conductive film-forming flat plate is negatively charged, and the lower plate of the conductive film-forming flat plate is grounded. The AC voltage field strength is 0.01kV / m, and the frequency is 200Hz. After the solvent evaporated, a nylon / chitosan mixed film was obtained. The tensile strength of the obtained composite film reaches 95MPa, and the elongation at break reaches 75%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of a nylon CS blended membrane with high tensile strength. In the application of the method, subsequent treatment is not required for the surface of nylone and chitosan, and a solubilizer is not added into a blend; an alternating electric field is exerted during the process of the inversion from phase to membrane; when the alternating electric field is exerted on the chitosan-formic acid-nylon system, phase separation between CS and PA begins as volatilization of solvent continues; different dielectric properties of PA and CS enable the electric field to form electrostatic stress at the phase interface; synergy between the electrostatic stress and interfacial tension can induce micro-phase mixing between macromolecular chains at the interface; through adjusting electric field intensity and alternating current frequency parameter, the characteristic of the response of dipole orientation to the electric field environment is combined to adjust the intensity and direction of the electrostatic stress and the relaxation behavior of chain segments at the interface, thereby intensifying the micro-phase mixing effect at the interface. Therefore, the compatibility and tensile property of the blend are improved. The entire preparation process is low in cost, clean and highly efficient.

Description

technical field [0001] The invention relates to a preparation method of a nylon CS blend film with high tensile strength. Background technique [0002] Chitosan (CS) is a very important natural polymer material, which is widely used in the fields of membrane separation, food packaging and drug release because of its cheap and easy to obtain, excellent biocompatibility and easy degradation. However, the low mechanical strength of CS limits its application range. Blending nylon with CS can greatly improve the hydrophilicity, antibacterial properties and stability of CS. However, due to the essential characteristics such as a large number of polar functional groups and polycations on the molecular chain of CS, there is often a macroscopic phase separation after blending with nylon (PA), resulting in low mechanical strength of the blend, even less than that of CS. its own mechanical strength. [0003] Phase inversion method is one of the main methods to prepare polymer blend ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08L77/06C08L5/08C08J5/18
CPCC08J5/18C08J2377/02C08J2377/06C08J2405/08C08L77/02C08L77/06C08L2203/16C08L5/08
Inventor 周琦张晶晶
Owner NINGBO UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com