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

Self-repairing repeatable-processed polysiloxane elastomer, preparation method and application

A technology of repeated processing and polysiloxane, which is applied in the field of new materials, can solve the problems of high reprocessing temperature, poor mechanical properties, mechanical properties and self-repairing properties can not be improved at the same time, to improve mechanical strength and simple synthesis process easy to control effect

Active Publication Date: 2018-03-20
SICHUAN UNIV
View PDF9 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, for the existing reversible covalently crosslinked polysiloxane elastomers containing hydrogen bonds or borate bonds have poor mechanical properties, high reprocessing temperature, and Diels-Alder bond crosslinking To solve the problem that the mechanical properties and self-healing properties of polysiloxane elastomers cannot be improved at the same time, the present invention provides a self-healing and reprocessable polysiloxane elastomer containing a metal ion catalyst and its preparation method. It is obtained by the reaction of primary amines and isocyanates. Under the catalysis of metals, it is a new type of thermoresponsive dynamic bond, which can make the material self-healing at 80°C, and the hydrogen bond interaction between urea bonds can improve the durability of the material. Mechanical strength, the elastomer has excellent mechanical properties, certain transparency, good reprocessing performance, high self-repair efficiency, low repair temperature, simple preparation process, and relatively low cost

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
  • Self-repairing repeatable-processed polysiloxane elastomer, preparation method and application
  • Self-repairing repeatable-processed polysiloxane elastomer, preparation method and application
  • Self-repairing repeatable-processed polysiloxane elastomer, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] A self-healing and reproducible polysiloxane elastomer with the following general structural formula:

[0026]

[0027] Among them, R and R1 are long chains composed of carbon, hydrogen, oxygen, and nitrogen.

[0028] A preparation method of a self-healing and reproducible polysiloxane elastomer, comprising the following steps: 3-13 parts by weight of crosslinking agent, 79 parts by weight of amino-terminated polydimethylsiloxane, 8~ 18 parts by weight of diisocyanate and 1 to 5 parts by weight of metal ion catalyst were dissolved in tetrahydrofuran to obtain a mixed solution. The concentration of the mixed solution was controlled to be 0.1 to 0.6 g / mL, and the reaction was stirred at room temperature for 5 minutes; then the prepolymer was poured Put it into a polytetrafluoroethylene mold and cure at room temperature for 24 hours, then put it in an oven at 80° C. to continue curing for 4 hours, and then take it out of the mold to obtain a self-healing and repeatable polysilo...

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
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of novel materials and specifically relates to self-repairing repeatable-processed polysiloxane elastomer, a preparation method and application. The self-repairing repeatable-processed polysiloxane elastomer has a following structural formula shown in a following image, wherein the R and the R1 in the structural formula are long chains prepared from carbon, hydrogen, oxygen and nitrogen. The prepared self-repairing repeatable-processed polysiloxane elastomer disclosed by the invention has the following advantages: a molecular main chain has urea bonds, and hydrogen bonds formed between the urea bonds can improve mechanical strength of materials; under catalytic action of metal ions, the urea bonds have thermal reversibility, and the material notonly has a self-repairing effect, but also can be recycled and processed again; the material can be applied to the fields of 3D printing, flexible electrode base materials and the like; a preparationtechnology is simple, and cost is relatively lower.

Description

Technical field [0001] The invention relates to the technical field of new materials, in particular to a self-repairing and repeatable polysiloxane elastomer and a preparation method and application thereof. Background technique [0002] The main chain of polysiloxane is composed of silicon and oxygen atoms alternately, and organic groups are directly connected to the silicon atoms. It has the characteristics of both inorganic and organic polymers, such as high and low temperature resistance, weathering resistance, electrical insulation, ozone resistance, Hydrophobic, good gas permeability, non-toxic, biologically inert, etc. It is widely used in electrical and electronic, construction, automotive, textile, medical and other fields. The molecular chain of polysiloxane is flexible and the intermolecular force is low, so it is usually used in the form of cross-linked elastomer. Traditional polysiloxane elastomer faces the same problems as all thermosetting materials: (1) The mater...

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 Applications(China)
IPC IPC(8): C08G77/388C08G77/08
CPCC08G77/08C08G77/388
Inventor 夏和生王占华杨莉傅代华孙劭杰
Owner SICHUAN UNIV
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