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A kind of preparation method of PP fiber reinforced silica gel material

A silica and fiber reinforced technology, applied in the field of preparation of gel materials, can solve the problems of poor interface compatibility, poor bending resistance, poor reinforcement effect, etc., and achieve safe energy consumption, good effect, and improved bending strength. big effect

Inactive Publication Date: 2017-04-19
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, some people have used inorganic fibers and their particles to strengthen, such as adding chopped mullite fiber, glass fiber, quartz powder, etc., the obtained reinforced material has a certain improvement in compression resistance, but the bending resistance is not good. ; Some people have used organic fibers, such as polyurethane fibers, polyvinyl chloride fibers, polyvinylidene fluoride fibers, etc. as SiO 2 Reinforced materials for airgel, but because of the poor interfacial compatibility between the surface of these fiber materials and the aerogel, the reinforcement effect is even worse, so it is necessary to develop a new method to solve the deficiencies in the above technology

Method used

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  • A kind of preparation method of PP fiber reinforced silica gel material
  • A kind of preparation method of PP fiber reinforced silica gel material
  • A kind of preparation method of PP fiber reinforced silica gel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Thickness 4 mm, fiber diameter 1-3 microns, density 0.3295 g / cm made by melt blown spinning machine 3 PP-g-AA non-woven fabric. Fully soak it in APTES, DCC, HOBt and dissolve it in DMF at a molar ratio of 1:1:1.2, keep the temperature at 60°C for 12 hours, wash with acetone for 6 hours, and dry to obtain the required PP-g-AA-APTES non-woven fabric.

[0036] Impregnate the above dried PP-g-AA-APTES non-woven fabric with tetraethyl orthosilicate (TEOS) solution (TEOS, ethanol and water molar ratio 1:14:1) for about 1 hour, until the bubbles on the surface of the impregnated solution disappear, take out the PP-g-AA-APTES non-woven fabric with TEOS soaked layer on the fiber surface.

[0037] Soak the PP-g-AA-APTES non-woven fabric with the TEOS soaking layer on the fiber surface in the hydrochloric acid aqueous solution with a pH of about 3.5 for 24 hours, take out the non-woven fabric co-hydrolyzed with the TEOS soaking layer and PP-g-AA-APTES cloth.

[0038] Slowly so...

Embodiment 2

[0042] Use the melt blown PP-g-AA non-woven fabric that has AA functional group on the surface of the fiber as described in Example 1. The non-woven fabric is fully soaked in the solution prepared by dissolving APTES, DCC, and HOBt in DMF at a molar ratio of 1.2:1:1.5, kept at 60°C for 12 hours, washed with acetone for 6 hours, and dried to obtain The required PP-g-AA-APTES non-woven fabric.

[0043] Immerse the dried PP-g-AA-APTES non-woven fabric with tetraethyl orthosilicate (TEOS) solution (TEOS, ethanol and water molar ratio 1:10:1) for about 1 hour, until the bubbles on the impregnated surface disappear, Take out the PP-g-AA-APTES non-woven fabric with TEOS soaked layer on the surface.

[0044] The PP-g-AA-APTES non-woven fabric with the TEOS immersion layer on the surface is soaked in the hydrochloric acid aqueous solution of pH 3.5, and left to hydrolyze for 24 hours. non-woven fabric.

[0045] Slowly soak the above non-woven fabric in ammonia water with a pH of abo...

Embodiment 3

[0049] Use the melt blown PP-g-AA non-woven fabric that has AA functional group on the surface of the fiber as described in Example 1. The non-woven fabric is fully soaked in the solution prepared by dissolving APTES, DCC, and HOBt in DMF at a molar ratio of 1.2:1:2, kept at 60°C for 12 hours, washed with acetone for 6 hours, and dried to obtain The required PP-g-AA-APTES non-woven fabric.

[0050] Immerse the dried PP-g-AA-APTES non-woven fabric with tetraethyl orthosilicate (TEOS) solution (TEOS, ethanol and water molar ratio 1:7:1) for about 1 hour, until the bubbles on the impregnated surface disappear, Take out the PP-g-AA-APTES non-woven fabric with TEOS soaked layer on the surface.

[0051] The PP-g-AA-APTES non-woven fabric with the TEOS immersion layer on the surface is soaked in the hydrochloric acid aqueous solution of pH 3.5, and left to hydrolyze for 24 hours. non-woven fabric.

[0052] Slowly soak the above non-woven fabric in ammonia water with a pH of about ...

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Abstract

The invention discloses a method for preparing a PP fiber-enhanced silica gel material. The enhanced fiber material prepared by adopting the method and an interface of an aerogel base material can be combined in a chemical covalent bond manner, so that the compatibility is greatly improved; the enhancement effect is significant; and compared with aerogel enhanced by a common fiber, the strength is enhanced by 110%-140%. The method comprises the following steps: firstly, carrying out amidation reaction on a fiber surface of a polypropylene melt-blown non-woven fabric with acrylic acid functional groups on the fiber surface by adopting APTES, so as to obtain a fiber non-woven fabric with the silanized fiber surface, wherein the fiber non-woven fabric with the silanized fiber surface is used as an enhanced material; dipping the fiber non-woven fabric with the silanized fiber surface in a TEOS solution, and generating a non-woven fabric with a thin-layer SiO2 gel on the surface through cohydrolysis and co-crosslinked gel reaction; forming an enhanced SiO2 wet gel material through cohydrolysis and co-crosslinked gel reaction in a crossing dipping manner for a plurality of times; and finally implementing a post-treatment procedure to obtain the PP fiber-enhanced SiO2 gel non-woven fabric.

Description

technical field [0001] The invention relates to a preparation method of a gel material, more specifically a preparation method of a PP fiber reinforced silica gel material. Background technique [0002] SiO 2 Airgel is a covalent bond network skeleton material with rich micropores formed by chemical cross-linking of silicon-containing organic substances. Most of the internal micropores are at the nanometer level, so the volume density is dozens of times smaller than that of general-purpose thermal insulation materials. It is currently recognized as the material with the lowest thermal conductivity in the world. Today, when energy is increasingly scarce and thermal pollution problems in towns and industrial parks are prominent, SiO with extremely high thermal insulation 2 Airgel materials can be used to greatly reduce heat loss and thermal pollution in the process of energy use. For example, it is expected to be widely used as a new type of heat insulation material in the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
Inventor 李梦星魏无际周清
Owner NANJING TECH UNIV