Resin crosslinking polyvinyl alcohol type aerogel and preparation method and application of resin crosslinking polyvinyl alcohol type aerogel

A technology of cross-linked polyvinyl alcohol and polyvinyl alcohol, which is applied in the field of airgel materials and its preparation, can solve problems such as poor mechanical properties, low airgel strength, and water absorption of products, and achieve improved flame retardancy, Improve mechanical properties and avoid hard-to-form effects

Active Publication Date: 2016-08-24
SICHUAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Although this method is environmentally friendly, relatively cheap, and overcomes some defects in the preparation process of traditional inorganic aerogels and organic aerogels, it still has some problems: first, due to the polymer used in this method They are all water-soluble polymers, and their preparation process is simple physical blending. Undoubtedly, the resulting product will have water absorption problems, which will seriously affect the mechanical properties and thermal insulation properties of the airgel; secondly, the clay itself The mechanical properties are poor, even if it is blended with polymers, the strength of the prepared airgel is still small, and it is difficult to meet the application requirements; third, because the raw materials required for the preparation of this method are still mainly organic matter, its flame retardant performance must be an insurmountable obstacle
However, the ammonium polyphosphate modified by piperazine still significantly destroys the three-dimensional network structure of the airgel, and thus has a greater impact on the mechanical properties of the airgel material.
At the same time, this method does not mention how to solve the problem of water absorption of the material, and the piperazine-modified ammonium polyphosphate and the organic matter itself have the characteristics of water absorption, so it can be speculated that the airgel material still has water absorption. The problem

Method used

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  • Resin crosslinking polyvinyl alcohol type aerogel and preparation method and application of resin crosslinking polyvinyl alcohol type aerogel
  • Resin crosslinking polyvinyl alcohol type aerogel and preparation method and application of resin crosslinking polyvinyl alcohol type aerogel
  • Resin crosslinking polyvinyl alcohol type aerogel and preparation method and application of resin crosslinking polyvinyl alcohol type aerogel

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Experimental program
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Effect test

Embodiment 1

[0038] The melamine and formaldehyde were first stirred and mixed according to the molar ratio of 1:3 and the pH of the system was adjusted to 8.5, and then reacted at 80°C for 30 minutes to obtain a melamine-formaldehyde resin precursor solution; The polyvinyl alcohol solution with a concentration of 1% is mixed evenly according to the hydroxyl molar ratio of 1:0.2, then the pH of the system is adjusted to 1, poured into the mold, and then frozen at -5℃ to solid, and then at -80℃ Dry under vacuum to prepare polyvinyl alcohol aerogel mixed with resin precursor; cross-link and solidify the prepared aerogel at 60° C. for 60 hours.

[0039] The density, oxygen index, peak heat release rate, compression modulus, water contact angle, dissolution in water at 90°C for 12 hours and shrinkage after vacuum drying of the obtained aerogel material are shown in the attached table.

Embodiment 2

[0041] First, stir and mix melamine and formaldehyde in a molar ratio of 1:3 and adjust the pH of the system to 8.5, then react at 80°C for 40 minutes to prepare a melamine-formaldehyde resin precursor solution; the melamine-formaldehyde resin precursor solution and mass percentage The 2% polyvinyl alcohol solution is mixed evenly according to the hydroxyl molar ratio of 1:0.5, then the pH of the system is adjusted to 4, poured into the mold, and then frozen at -50℃ to solid, and then at -50℃ Dry under vacuum to obtain polyvinyl alcohol aerogel mixed with resin precursor; cross-link and solidify the obtained aerogel at 80°C for 48 hours.

[0042] The density, oxygen index, peak heat release rate, compression modulus, water contact angle, dissolution in water at 90°C for 12 hours and shrinkage after vacuum drying of the obtained aerogel material are shown in the attached table.

Embodiment 3

[0044] First, stir and mix melamine and formaldehyde in a molar ratio of 1:3 and adjust the pH of the system to 8.5, then react at 80°C for 50 minutes to prepare a melamine-formaldehyde resin precursor solution; the melamine-formaldehyde resin precursor solution and mass percentage The polyvinyl alcohol solution with a concentration of 5% is mixed uniformly according to the molar ratio of hydroxyl group at 1:1, then the pH of the system is adjusted to 5, poured into the mold, and then frozen at -80℃ to solid, and then at -20℃ Dry under vacuum to prepare polyvinyl alcohol aerogel mixed with resin precursor; cross-link and solidify the prepared aerogel at 90°C for 36 hours.

[0045] The density, oxygen index, peak heat release rate, compression modulus, water contact angle, dissolution in water at 90℃ for 12 hours and shrinkage after vacuum drying of the obtained aerogel materials are shown in the attached table.

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Abstract

The invention discloses resin crosslinking polyvinyl alcohol type aerogel and a preparation method and application of the resin crosslinking polyvinyl alcohol type aerogel. The resin crosslinking polyvinyl alcohol type aerogel is obtained by blending a synthetic resin precursor solution and aqueous polyvinyl alcohol, subjecting a blend to freeze drying to obtain aerogel and subjecting the aerogel to cross-linking curing. The density of the resin crosslinking polyvinyl alcohol type aerogel is 76-179 Kg / m<3>, limit oxygen index is 23.0-38.5%, peak heat release rate is 48.0-292.1 kW / m<2>, compression modulus is 7.2-37.2 MPa, and water contact angle is 33.1-136.2 degrees. The resin crosslinking polyvinyl alcohol type aerogel prepared from raw materials shows a regular and uniform three-dimensional network structure and better mechanical and flame-retardant properties, avoids negative effects caused by holes due to adding a fire retardant and other substances into the aerogel, solves the problem of water absorption of existing aerogel materials and can be widely applied to the fields of construction insulation, piping insulation, sound insulation and the like owing to excellent inherent thermal insulation and sound insulation properties.

Description

Technical field [0001] The invention belongs to the technical field of aerogel materials and their preparation, and specifically relates to a resin cross-linked polyvinyl alcohol aerogel, and a preparation method and application thereof. Background technique [0002] The problem of energy shortage has become a major problem affecting the development of the world today. Energy saving and consumption reduction is an important measure to alleviate energy shortage, which is particularly important for our country. [0003] At present, the domestic market mainly uses foamed concrete, diatomite products, silicate insulation materials, ceramic insulation materials, rubber powder polystyrene particles, expanded polystyrene boards (EPS), extruded boards (XPS) and polyurethane as insulation materials. . Among them, although organic insulation materials such as EPS, XPS and polyurethane have the characteristics of low density and good insulation effect, they dominate the field of insulation m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L61/28C08L61/24C08L61/10C08J3/24
CPCC08J3/24C08J2329/04C08J2461/10C08J2461/24C08J2461/28C08L29/04C08L2201/02C08L61/28C08L61/24C08L61/06
Inventor 王玉忠商珂杨君驰曹志杰廖望
Owner SICHUAN UNIV
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