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

Preparation method of nano-silica powder-based super composite thermal insulation material

A technology of nano-silica and thermal insulation materials, applied in the field of thermal insulation materials, can solve problems such as high risk, cumbersome process flow, complex preparation process, etc., and achieve the effects of high mechanical strength, wide application range and low thermal conductivity

Active Publication Date: 2017-05-31
GUANGXI UNIV
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are also a lot of research using atmospheric pressure drying technology, so far this technology is only for small volume materials, and it is still in the laboratory research stage
The industrial production of silica airgel insulation materials has the following problems: first, the process is cumbersome and the preparation cycle is long; second, the supercritical drying equipment is expensive, and it is a high-temperature and high-pressure equipment, and its safe use and maintenance requirements are strict; The third is that the drying process needs to consume a lot of energy and supercritical media, and there is a problem of recycling supercritical media at the same time
However, the preparation technology of these high-temperature aerogels is not mature enough, and is still in the stage of laboratory exploration so far.
[0007] In short, the preparation process of the existing silica airgel insulation materials is complex, the supercritical drying process requires high energy consumption and high risk, and it is difficult to implement large-scale industrial production, and the silica airgel itself has mechanical properties, temperature resistance Both performance and high temperature insulation performance need to be improved

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
  • Preparation method of nano-silica powder-based super composite thermal insulation material
  • Preparation method of nano-silica powder-based super composite thermal insulation material
  • Preparation method of nano-silica powder-based super composite thermal insulation material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation method comprises the following steps:

[0036] (1) Reinforcing fiber pre-dispersion. Put the reinforcing fiber into the high-speed disperser for pre-dispersion, the stirring speed is 500-800r / min, and the time is 1min.

[0037] (2) Mixing and modification of raw materials. Add the dispersed reinforcing fibers together with fumed silicon dioxide, silicon carbide, and fumed aluminum oxide into the mechanical fusion equipment at a speed of 1200r / min for 30 minutes. The four component materials are thoroughly mixed. At the same time, the coating modification of the surface of the reinforcing fiber and the infrared sunscreen agent by the nano-powder material is realized.

[0038] (3) Anti-rebound pretreatment. Choose steam curing equipment for anti-rebound pretreatment, first add water, ethanol, or ammonia water into the steam curing tank of the steam curing equipment, then put the mixed materials in (2) into the steam curing equipment, and put the materi...

Embodiment 1

[0044] Get fumed silica 85wt%, length is 15wt% of non-alkali ultrafine glass fiber of 5mm, add non-alkali ultrafine glass fiber in the high-speed disperser and carry out pre-dispersion, stirring speed 800r / min, time is 1min, pre-dispersed Add the dispersed alkali-free ultrafine glass fiber and fumed silica powder into the mechanical fusion equipment, mix at 1200r / min for 30min, and then use steam curing equipment to mix the mixed material with water vapor at 80°C Put the material treated by the steam curing equipment into the mold, press it with a hydraulic press at a pressurization rate of 1N / s and a final pressure of 2MPa, and finally put the formed block material into a drying oven for drying , After heat treatment at 110°C for 6 hours, a high-performance nano-silica powder-based super composite thermal insulation material can be prepared. It is measured that the porosity is as high as 85.84%, the pore diameters are concentrated in the range of 13.5-292.2nm, and most of the...

Embodiment 2

[0046] Get 70wt% of fumed silica, 25wt% of silicon carbide, and 5wt% of alkali-free ultrafine glass fiber with a length of 5mm, add the alkali-free ultrafine glass fiber into a high-speed disperser for pre-dispersion, the stirring speed is 600r / min, and the time Add the pre-dispersed alkali-free ultra-fine glass fiber, fumed silica powder and silicon carbide into the mechanical fusion equipment, mix at 1200r / min for 30min, and then use steam curing equipment to mix evenly The raw material is fully contacted with water vapor at 80°C for 30 minutes, the material treated by the steam curing equipment is put into the mold, and the hydraulic press is pressed at a pressurization rate of 1N / s and a final pressure of 2MPa, and finally the formed block The material is dried in a drying oven and heat-treated at 110°C for 6 hours to obtain a high-performance nano-silica powder-based super composite thermal insulation material. The test results of the mechanical properties of the thermal ...

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
particle diameteraaaaaaaaaa
densityaaaaaaaaaa
service temperatureaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a nano-silica powder-based super composite thermal insulation material. Nano-silica powder and a functional additive are taken as raw materials, the nano-silica powder accounts for over 60% of total weight of the raw materials and the functional additive at least comprises reinforced fibers; the preparation method comprises the steps of stirring and dispersing the reinforced fibers at a rotating speed of 400-1,000r / min for 0.5-1.5 minutes; mechanically fusing the dispersed reinforced fibers, the nano-silica powder and other functional additives to complete coating modification on the surface of the functional additive by the nano-silica powder; and making the fused materials in full contact with steam at 80-85 DEG C for 28-32 minutes, extruding air and carrying out pressing, molding and drying to obtain the high-performance nano-silica powder-based super composite thermal insulation material. According to the preparation method, the supercritical drying process with strict conditions in an existing preparation technology is abandoned; and the nano-silica powder-based super composite thermal insulation material with excellent performance is prepared through a simple dry process.

Description

technical field [0001] The invention belongs to the technical field of heat insulation materials, and relates to a preparation method of heat insulation materials, in particular to a preparation method of silicon dioxide powder-based super heat insulation materials. Background technique [0002] Super heat insulation material is a heat insulation material whose thermal coefficient is lower than that of "non-convective air". Molecules collide with each other. Since the mean free path of the main components of nitrogen and oxygen in the air is about 70nm, when the micropore size inside the material is smaller than this critical size, the convective heat transfer of gas molecules is suppressed, thus obtaining a ratio " No convective air" lower thermal conductivity. Therefore, super thermal insulation materials are also called nanoporous super thermal insulation materials, among which silica airgel thermal insulation materials are currently the most researched and most represen...

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): C04B30/02
CPCC04B20/1066C04B30/02C04B2201/20C04B2201/32C04B14/42C04B20/1055
Inventor 封金鹏王友兰马少健莫伟杨金林苏秀娟张敏林美群
Owner GUANGXI 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

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