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Aerogel density board and preparation method thereof

A density board and aerogel technology, applied in the field of materials, can solve the problems of increasing the difficulty of resin curing, poor crossover strength of straw density board, poor mechanical strength and toughness, etc., achieving low cost, environmental protection, excellent performance of finished products, and improved flexibility sexual effect

Inactive Publication Date: 2017-05-24
湖北硅金凝节能减排科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface layer of general straw is wrapped by a large amount of sulfur dioxide, fat, minerals and other substances, which together form a smooth non-polar surface layer, resulting in poor bonding strength of straw MDF. The existence of these substances will not only prevent the internal hydroxyl groups of straw from Formation of chemical bonds between synthetic resins, but also increases the difficulty of resin curing
MDF made of straw is inferior to wood flour MDF in terms of mechanical strength and toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The present invention provides an airgel density board and a preparation method thereof. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below.

[0024] Airgel is a very porous material with the highest porosity of any known solid. The airgel powder of the present invention is representative silica airgel, and the airgel powder has a porous structure, and the inner space of the airgel powder is mostly empty, so that the airgel powder exhibits Attractive properties such as super heat insulation, light weight, sound absorption, low dielectric constant, and the like. The biggest advantage of airgel powder is super heat insulation, compared with traditional MDF and its analogs, airgel shows a lower thermal conductivity of less than 0.030W / m·K. According to reports, the thermal conductivity of silica airgel is smaller than that of products in many technical re...

Embodiment 1

[0032] A kind of method for preparing airgel density board

[0033] 1) Soak the straw powder in a 0.5% sodium hydroxide solution for 30 minutes and then dry it;

[0034] 2) Mix 70 parts of dried straw powder, 20 parts of urea-formaldehyde resin, 10 parts of epoxy resin, 5 parts of epoxy resin curing agent, 3 parts of airgel powder, 6 parts of calcium carbonate, 2 parts of carbon fiber and 1 part of flame retardant Parts are mechanically stirred and mixed, poured into the mold, kept at 120°C for 10 minutes, pressed and molded to form an airgel density board.

[0035] The thermal conductivity of the obtained airgel density board is tested by the steady state method. The dimensional stability of the product is characterized by the degree of warpage, and the flexibility is characterized by the bending arc table.

[0036] The steady-state method is to measure the thermal conductivity by measuring the temperature distribution in the sample and the heat flow through the sample after...

Embodiment 2

[0040] A kind of method for preparing airgel density board

[0041] 1) Soak the straw powder in a 0.7% sodium hydroxide solution for 30 minutes and then dry it;

[0042] 2) 75 parts of dried straw powder, 30 parts of urea-formaldehyde resin, 20 parts of epoxy resin, 10 parts of epoxy resin curing agent, 5 parts of airgel powder, 10 parts of calcium carbonate, 3 parts of carbon fiber and 2 parts of flame retardant Parts are mechanically stirred and mixed, poured into the mold, kept at 140°C for 20 minutes, pressed and molded to form an airgel density board.

[0043] The airgel MDF sample in Example 2 has a thickness of 12mm and a length of 100mm. The test results show that the thermal conductivity of the obtained product sample is 0.24W / (m K), and the bending arc is 22°. Curved strength, tensile strength, water content, nail holding force, water expansion rate and formaldehyde content and other indicators are better than GB / T117181-999, GBl8580-2001 national standards (inner j...

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Abstract

The invention discloses an aerogel density board. The aerogel density board is prepared by the following steps of carrying out soaking treatment on straw powder through a sodium hydroxide solution and then drying; and mixing the following raw materials in parts by weight: 70-80 parts of processed straw powder, 20-40 parts of urea resin, 10-30 parts of epoxy resin, 5-20 parts of an epoxy curing agent, 3-8 parts of aerogel powder, 6-15 parts of calcium carbonate, 2-5 parts of carbon fibers and 1-3 parts of a fire retardant evenly, injecting the mixture into a mold, carrying out heat preservation at 120-160 DEG C for 10-30 minutes, carrying out compression molding and demolding to form the aerogel density board. The aerogel density board disclosed by the invention is high in mechanical strength, good in toughness, good in thermal insulation property, and the straw and the resin solidification effect is good in the preparation process.

Description

technical field [0001] The invention relates to the field of material technology, in particular to an airgel density board and a preparation method thereof. Background technique [0002] Large-area burning of plant stalks is likely to cause air pollution, but in fact, straw has a longitudinal tensile capacity comparable to that of some wood, and even after heat treatment, it will only be slightly reduced. However, the surface layer of general straw is wrapped by a large amount of sulfur dioxide, fat, minerals and other substances, which together form a smooth non-polar surface layer, resulting in poor bonding strength of straw MDF. The existence of these substances will not only prevent the internal hydroxyl groups of straw from The formation of chemical bonds between synthetic resins will also increase the difficulty of resin curing. MDF made of straw is inferior to wood flour MDF in terms of mechanical strength and toughness. In addition, the insulation performance of de...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L61/24C08L63/00C08K13/04C08K3/26C08K7/06C08K7/26C08G59/42
CPCC08L97/02C08G59/42C08L2205/03C08L61/24C08L63/00C08K13/04C08K2003/265C08K7/06C08K7/26
Inventor 王天赋彭战军张阳辅龙
Owner 湖北硅金凝节能减排科技有限公司
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