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Wet gel block and efficient demolding method thereof

A wet gel and block technology, applied in colloid chemistry, colloid chemistry, aerogel preparation, etc., can solve the problem of low yield of crack-free aerogel blocks, inability to effectively control the size of aerogels, and wet coagulation. The weak strength of the rubber skeleton can achieve the effect of efficient and rapid demoulding, universality, and avoiding uneven stress.

Active Publication Date: 2021-02-09
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This strategy of relying on shrinkage and demoulding, because the shrinkage process is uncontrollable, on the one hand, the yield of crack-free airgel blocks is not high, and on the other hand, the size of the final airgel cannot be effectively controlled.
However, for the preparation of ultra-low-density aerogels, the strength of the wet gel skeleton is too weak to overcome the adhesion force of the mold surface to it during the natural shrinkage process, and the success rate of obtaining a complete block without cracks very low, and in some cases unobtainable

Method used

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  • Wet gel block and efficient demolding method thereof
  • Wet gel block and efficient demolding method thereof
  • Wet gel block and efficient demolding method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] ① Weigh 30g of paraffin wax and 1000g of DuPont Krytox GPL106 perfluoropolyether oil in a metal box with a size of 100mm (length) × 100mm (width) × 60mm (height) and mix them evenly with a glass rod to obtain perfluorocarbon oil. Put it into an oven at 40°C and heat it for 2 hours, then soak the open cuboid polytetrafluoroethylene mold whose inner surface is cleaned and whose size is 70mm (length)×40mm (width)×20mm (height) into the above metal box for 40 ℃ perfluorocarbon oil for 60 seconds, take out the mold, wipe off the perfluorocarbon oil on the outer surface of the mold, absorb the excess perfluorocarbon oil on the inner surface of the mold with oil-absorbing paper, and then use nitrogen flow to blow the inner surface of the mold, so that A small amount of remaining perfluorocarbon oil is distributed on the inner surface of the mold in a uniform ultra-thin layer, forming a thin layer of liquid perfluorocarbon oil with a thickness of 0.5mm on the inner surface of th...

Embodiment 2

[0069] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0070] In step ①, weigh 10g of paraffin and 1000g of DuPont Krytox GPL106 perfluoropolyether oil in a metal box with a size of 100mm (length) × 100mm (width) × 60mm (height) and mix them evenly with a glass rod to obtain perfluorocarbon oil , put the metal box into an oven at 40°C and heat it for 2 hours, then soak an open cuboid polytetrafluoroethylene mold with a size of 70mm (length) × 40mm (width) × 20mm (height) whose inner surface has been scrubbed clean into the above-mentioned Put the perfluorocarbon oil in the metal box at 40°C for 60 seconds, take out the mold, wipe off the perfluorocarbon oil on the outer surface of the mold, absorb the excess perfluorocarbon oil on the inner surface of the mold with oil-absorbing paper, and then blow the mold with nitrogen flow On the inner surface, a small amount of remaining perfluorocarbon oil is distributed on the inner surface of the mold in a unif...

Embodiment 3

[0073] Embodiment 3 is basically the same as Embodiment 1, the difference is:

[0074] In step ①, weigh 80g of paraffin and 1000g of DuPont Krytox GPL106 perfluoropolyether oil in a metal box with a size of 100mm (length) × 100mm (width) × 60mm (height) and mix them evenly with a glass rod to obtain perfluorocarbon oil , put the metal box into an oven at 40°C and heat it for 2 hours, then soak an open cuboid polytetrafluoroethylene mold with a size of 70mm (length) × 40mm (width) × 20mm (height) whose inner surface has been scrubbed clean into the above-mentioned Put the perfluorocarbon oil in the metal box at 40°C for 60 seconds, take out the mold, wipe off the perfluorocarbon oil on the outer surface of the mold, absorb the excess perfluorocarbon oil on the inner surface of the mold with oil-absorbing paper, and then blow the mold with nitrogen flow On the inner surface, a small amount of remaining perfluorocarbon oil is distributed on the inner surface of the mold in a unif...

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Abstract

The invention relates to a wet gel block and an efficient demolding method thereof. The method comprises the following steps: coating the inner surface of a mold with a liquid perfluorocarbon oil thinlayer; cooling the mold to solidify the liquid perfluorocarbon oil thin layer in the mold; putting sol used for preparing the aerogel into the mold, and carrying out gel forming; putting the mold containing the wet gel block into a drying oven for heating so as to melt the solid perfluorocarbon oil thin layer on the inner surface of the mold; and cooling the mold containing the wet gel block to room temperature, then soaking the interior of the mold with an organic solvent, and finally, conducting demolding to take out the wet gel block contained in the mold. By means of the method, simple, efficient and rapid demolding of the wet gel block can be achieved, the obtained wet gel block is complete in appearance and free of cracks and size shrinkage, and the success rate of demolding is close to 100%. According to the demolding method, the yield of a final aerogel products can be greatly increased, a production speed is increased, cost is reduced, and the application process of the aerogel is greatly promoted.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and relates to a wet gel block in the preparation of airgel and an efficient demoulding method thereof, in particular to a high-efficiency demoulding method for the wet gel block in the preparation of airgel with fragile structure . Background technique [0002] As a nanoporous material with excellent comprehensive properties, aerogel has attracted extensive research interest. Obtaining a complete, crack-free and size-specific block is a prerequisite for airgel to be widely used in many fields such as heat insulation, sound insulation and noise reduction, energy conversion, biomedicine, high-energy physics, deep space exploration, and national defense and military affairs. The most common preparation process of airgel often includes steps such as sol preparation, gel forming, gel aging, gel demoulding, gel solvent replacement, and gel supercritical drying. Conventional inorganic ce...

Claims

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Application Information

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IPC IPC(8): C01B33/158C01F7/02C01G25/02C01G23/04B28B1/14B28B7/38B01J13/00
CPCC01B33/1585C01F7/021C01G25/02C01G23/04B28B1/14B28B7/384B01J13/0091C01P2006/10C01P2006/32
Inventor 张晚林刘圆圆李文静李健黄红岩杨洁颖赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH