Silicon dioxide aerogel polyurea and preparation method thereof

A technology of silica and aerogel, which is applied in the field of preparation of silica airgel polyurea, can solve the problem of poor temperature resistance, poor ambient temperature, and poor weather resistance. and other issues to achieve the effects of enhancing weather resistance, expanding the working temperature range, and increasing the working temperature range

Inactive Publication Date: 2020-08-11
中科润资科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyurea material itself generally has the disadvantages of poor temperature resistance (sensitive to ambient temperature, unable to maintain performance and state at 90°C above zero or minus 20°C below zero), weak weather resistance, etc.;

Method used

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  • Silicon dioxide aerogel polyurea and preparation method thereof
  • Silicon dioxide aerogel polyurea and preparation method thereof
  • Silicon dioxide aerogel polyurea and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] According to above-mentioned material description, a kind of preparation method of silica airgel polyurea is provided, and its steps are:

[0034] (1) After heating the polyurea component, pour it into the container of the disperser to fully stir;

[0035] (2) Divide the hydrophilic silicon dioxide powder into equal batches and add in the polyurea component successively for stirring;

[0036] (3) When mixing and stirring the hydrophilic silica powder and the polyurea component, keep the temperature of the polyurea component controlled at 50-60°C;

[0037] (4) When the volume ratio of the hydrophilic silica powder and the polyurea component after mixing is between 5% and 10%, and the viscosity is not higher than 1000mPa.s, component B is obtained;

[0038] (5) Mix component B and component A in proportion to obtain silica airgel polyurea.

[0039] In step (1), the heating temperature of the polyurea component is between 50-60° C., and the stirring speed of the polyurea...

Embodiment 1

[0044] By weighing 3g of hydrophilic silica airgel powder and 47g of polyurea component B, after fully and uniformly dispersing and mixing through a disperser, add 100g of traditional polyurea component A, and the ratio of A and B components is 2:1 (weight ratio) fully mixed and pressurized and heat-treated to obtain silica airgel polyurea;

[0045] Subsequently, silica airgel polyurea and traditional polyurea were manually brushed on the upper surface of the stainless steel plate (size 150x150X10mm) substrate, the thickness was controlled within the range of 2mm±1mm, and the heating test was carried out after standing at room temperature for 24 hours. The performance measurement is as follows:

[0046]

[0047]

Embodiment 2

[0049] By weighing 4g of hydrophilic silica airgel powder and 46g of polyurea component B, after fully and uniformly dispersing and mixing through a disperser, add 50g of traditional polyurea component A, and the ratio of components A and B to 1:1 (weight ratio) fully mixed and pressurized and heated to obtain silica airgel polyurea; then sprayed evenly on the release plate with a high-pressure spray gun, the thickness is controlled within the range of 2mm ± 1mm, and then cut at room temperature for 24 hours Formed size: 300mmX300mm sheet, conduct thermal conductivity measurement, the measurement is shown in the following table:

[0050]

[0051]Traditional silica airgel is a solid powder, which neither dissolves nor melts in the temperature range of -196°C to 800°C. It cannot be added to the preparation process of polyurea. The invention provides a brand-new method for integrating silica airgel powder into the polyurea material preparation process, and further invents a n...

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Abstract

The invention relates to the technical field of aerogel application, in particular to silicon dioxide aerogel polyurea and a preparation method thereof. The silicon dioxide aerogel polyurea compositematerial is prepared by mixing a silicon dioxide aerogel polyurea component and a traditional polyurea component, a traditional polyurea component serves as a component A, a silicon dioxide aerogel polyurea component serves as a component B, the mixing ratio of the component A to the component B is 1: 1 or 2: 1, the silicon dioxide aerogel polyurea component is composed of a polyurea component andhydrophilic silicon dioxide powder, and the polyurea component is composed of polyether polyol and diethyltoluenediamine; a traditional polyurea component is composed of diphenylmethane diisocyanateand a prepolymer. The blank in the field of silicon dioxide aerogel polyurea materials is filled up, the working temperature range of traditional polyurea is greatly widened, the weather resistance ofthe material in practical application is enhanced, meanwhile, the heat conductivity coefficient range of the material is adjustable through a special formula system, and the application feasibility of the material in the field of heat preservation is expanded.

Description

technical field [0001] The invention relates to the technical field of airgel application, in particular to a preparation method of silica airgel polyurea. Background technique [0002] Silica (SiO2) airgel is a new type of porous functional material with solid phase particles and particle pore size in the nanometer scale. The continuous three-dimensional network structure can be controlled and tailored at the nanometer scale. Silica aerogels are sometimes called "solid smoke" or "frozen smoke" because of their translucency and ultra-light weight. Silica airgel has many unique properties, such as high specific surface area, high porosity, high thermal insulation, low density, ultra-low dielectric constant and low refractive index, etc., and its properties can be improved with the control of its structure. Continuous adjustability. The excellent performance of silica airgel makes it have broad application prospects in thermal insulation, thermal insulation, catalysis, energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/02C08K7/26
CPCC08L75/02C08L2205/025C08L2201/08
Inventor 白元宇吴为苏文涛
Owner 中科润资科技股份有限公司
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