CN115162049A - Preparation method and application of aerogel heat insulation paper - Google Patents
Preparation method and application of aerogel heat insulation paper Download PDFInfo
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- CN115162049A CN115162049A CN202210744043.5A CN202210744043A CN115162049A CN 115162049 A CN115162049 A CN 115162049A CN 202210744043 A CN202210744043 A CN 202210744043A CN 115162049 A CN115162049 A CN 115162049A
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- aerogel
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- silane coupling
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- 239000004964 aerogel Substances 0.000 title claims abstract description 88
- 238000009413 insulation Methods 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 27
- 230000001070 adhesive effect Effects 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 25
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 20
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 22
- 241000196324 Embryophyta Species 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 229920003086 cellulose ether Polymers 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 244000025254 Cannabis sativa Species 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims description 2
- 229920000881 Modified starch Polymers 0.000 claims description 2
- 239000004368 Modified starch Substances 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims description 2
- 229920002522 Wood fibre Polymers 0.000 claims description 2
- 238000006136 alcoholysis reaction Methods 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 2
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims description 2
- 235000019426 modified starch Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000002025 wood fiber Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 10
- 239000002270 dispersing agent Substances 0.000 abstract description 6
- 238000012412 chemical coupling Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 3
- 235000012171 hot beverage Nutrition 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000004965 Silica aerogel Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 239000007783 nanoporous material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000002464 physical blending Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/13—Silicon-containing compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
- D21H17/26—Ethers thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses a preparation method and application of aerogel heat insulation paper, wherein plant fibers are selected as a matrix, an adhesive, a silane coupling agent, aerogel and a dispersing solvent are added to adjust the flexibility and heat insulation coefficient of the aerogel heat insulation paper, the aerogel material and the plant fibers are tightly combined through a chemical coupling method, and the aerogel is uniformly dispersed in the fibers and the flexibility of the heat insulation paper is improved under the action of a dispersing agent and the adhesive.
Description
The technical field is as follows:
the invention relates to a preparation method and application of aerogel heat insulation paper.
Background art:
aerogels, also known as "blue smoke", are a class of nano-porous materials with excellent physical morphology structure and low thermal conductivity (0.012W/(mK)), which are ideal raw materials for preparing super heat-insulating materials, and aerogels, including inorganic aerogels (such as SiO, which have been successfully prepared and reported at present 2 ,、Al 2 O 3 、TiO 2 Etc.), organic aerogels (carbon nanotubes, graphene, etc.), and composite aerogels (e.g., fiber-reinforced silicon aerogels). However, the aerogel materials have the greatest disadvantage of being fragile, which limits the application range thereof.
Patent CN107201687A provides a preparation method of aerogel heat insulation paper, the obtained aerogel heat insulation paper has good flexibility and excellent heat insulation performance, but the preparation method adopts pure physical blending, the aerogel dosage does not exceed 20%, and the application range is greatly limited; the heat insulation coefficient of the prepared aerogel heat insulation paper is between 0.02 and 0.03 W.K -1 ·m -1 In the meantime.
The method for preparing the heat insulation paper provided by the patent CN108373316A adopts a one-step sol-gel method to prepare the aerogel heat insulation paper, although the operation steps are simplified, the range of the types of the aerogel used is limited, and meanwhile, the inorganic fibers are selected as the raw materials of the heat insulation paper in the above two inventions, and the heat insulation performance needs to be improved.
The invention content is as follows:
the invention aims to provide a preparation method and application of aerogel heat insulation paper, wherein plant fibers are selected as a matrix, an adhesive, a silane coupling agent, different types of aerogels and dispersing solvents are added to adjust the flexibility and the heat insulation coefficient of the aerogel heat insulation paper, the aerogel material and the plant fibers are tightly combined through a chemical coupling method, the addition amount of aerogel can be increased to the greatest extent, the aerogel can be uniformly dispersed in the fibers under the action of a dispersing agent and the adhesive, the flexibility of the heat insulation paper is improved, the prepared aerogel heat insulation paper can well fix aerogel powder, has a low heat insulation coefficient, high flexibility, a thin thickness and smoothness, can be made into various shapes and protective sleeves, and can be used for special heat insulation paper products, such as printed bills, hot drink paper cups, building decorative paper and the like, and is suitable for the fields of daily use, building, transportation and the like.
The invention is realized by the following technical scheme:
a preparation method of aerogel heat insulation paper comprises the following steps:
s1, placing plant fibers in a container, adding excessive deionized water, and fluffing by a fluffer to obtain matrix slurry for later use; the plant fiber is grass fiber, wood fiber or regenerated fiber;
s2, dissolving the adhesive into a transparent solution by using hot water at the temperature of 70-100 ℃ to obtain an adhesive solution for later use; the adhesive is any one of cellulose ether, starch, modified starch and polyvinyl alcohol, preferably polyvinyl alcohol, and the cellulose ether is selected from carboxymethyl cellulose or hydroxypropyl cellulose;
s3, sieving the aerogel powder by a 40-120-mesh sieve, adding the aerogel powder, an adhesive solution, a silane coupling agent and a dispersing solvent into the slurry obtained in the step S1, uniformly mixing, and fully dispersing in a pulp fluffer; vegetable fiber, adhesive, silane coupling agent, aerogel powder and dispersionThe mass ratio of the solvent is 100:5 to 20:1 to 5:10 to 30:5 to 20; preferably, the ratio of 100:10 to 20:2 to 5:10 to 20:10 to 20; more preferably 100:15:3:15:15; the dispersing solvent is one or more of ethanol, methanol, glycol or acetone; the silane coupling agent has a structure of Y-R-Si (OR) 3 (ii) a Wherein Y is an organic functional group, preferably-NH 2 Or an epoxy group; the aerogel powder is SiO 2 、Al 2 O 3 Any of the inorganic aerogels;
and S4, pouring the uniformly dispersed mixed slurry obtained in the step S3 into a papermaking device for papermaking, and carrying out hot pressing and drying to obtain the aerogel heat insulation paper.
Preferably, the disintegration in step S1 is preferably relieving at 6000-15000rpm for 5-25min, more preferably at 10000rpm for 15min.
Preferably, the hot water temperature in step S2 is 90 ℃.
The relative molecular mass of the adhesive is 1000-1000000.
Preferably, in the adhesive, the alcoholysis degree of PVA is 99%, and the molecular weight repeating unit is 17. The solution formed after the adhesive is dissolved has moderate viscosity and can be used as a sizing agent in the papermaking step.
Preferably, the silane coupling agent is KH550 or KH560, more preferably KH560, and the molecular chain Y part of the silane coupling agent contains a large number of epoxy groups, so that a chemical bond can be formed in a composite system during drying, and the materials are connected more stably.
Preferably, the dispersion solvent is ethanol, which has relatively low toxicity and can uniformly disperse the aerogel powder.
Preferably, the aerogel powder is preferably SiO 2 . The silica aerogel has excellent heat insulation performance and more advantages in preparation cost.
The aerogel heat-insulating paper obtained by the invention has the advantages of low heat-insulating coefficient, excellent heat-insulating property, high flexibility, small thickness and flat texture, can be made into heat-insulating protective sleeves with various shapes, can be used for special heat-insulating paper products such as printed bills, hot drink paper cups, building decorative paper and the like, and is suitable for the fields of daily chemicals, buildings, traffic and the like.
The invention has the following beneficial effects:
1) The adopted raw materials and the preparation process are simple, green and safe, the heat-insulating property of the heat-insulating paper can be enhanced by the introduction of aerogel powder, the problems of falling off and powder falling of aerogel and the like can be effectively solved by the introduction of an adhesive, and the aerogel of the aerogel heat-insulating paper can be dispersed more uniformly and has smoother texture due to the existence of a silane coupling agent and a dispersing agent. The defect of uneven dispersion of aerogel composite material aerogel powder is overcome.
2) The invention selects plant fiber as a substrate, adds adhesive, silane coupling agent, aerogel of different types and dispersing solvent to adjust the flexibility and the heat insulation coefficient, tightly combines aerogel material with the plant fiber by a chemical coupling method, can increase the addition of the aerogel to the maximum degree, simultaneously enables the aerogel to be uniformly dispersed in the fiber and improves the flexibility of the heat insulation paper under the action of dispersing agent and adhesive, the prepared aerogel heat insulation paper can well fix aerogel powder, has lower heat insulation coefficient, higher flexibility, thinner thickness and smoothness, can be made into various shapes and protective sleeves, can also be used for special heat insulation paper products, such as printing bills, hot drink paper cups, building decorative paper and the like, is applicable in the fields of daily chemicals, buildings, traffic and the like, overcomes the defect of large brittleness of the aerogel material, and also solves the problem of poor heat insulation effect of inorganic mineral fiber as the substrate.
Description of the drawings:
FIG. 1 is a front view of aerogel heat insulating paper obtained in example 1;
FIG. 2 is a front view of the aerogel thermal insulation paper obtained in comparative example 1;
fig. 3 is a front view of the aerogel thermal insulation paper obtained in comparative example 2.
The specific implementation mode is as follows:
the following is a further description of the invention and is not intended to be limiting.
Example 1: preparation method of aerogel heat insulation paper
The method comprises the following steps:
s1, placing 100 g of grass fibers in a container, adding 2-3L of deionized water, and defibering for 5min at 8000rpm by using a defibering machine to obtain matrix slurry for later use;
s2, dissolving 10 g of 1799 type PVA of the adhesive into a transparent solution by using hot water at 90 ℃ to obtain an adhesive solution for later use;
s3, mixing SiO 2 Sieving the aerogel powder with a 40-120 mesh sieve, and adding 5 g of SiO into the slurry obtained in the step S1 2 Aerogel powder, the adhesive solution obtained in the step S2, 1 g of KH550 silane coupling agent and 10 g of dispersion solvent ethanol are uniformly mixed and are subjected to 10000rpm relieving in a pulp fluffer for 15min to be fully dispersed;
and S4, pouring the uniformly dispersed mixed slurry obtained in the step S3 into a papermaking device for papermaking, and performing hot pressing and drying to obtain aerogel heat insulation paper with the thickness of 500 microns.
Comparative example 1:
reference example 1 was made except that no KH550 silane coupling agent was added.
Comparative example 2:
reference example 1 was made except that ethanol, a dispersion solvent, was not added.
The aerogel thermal insulation paper obtained in example 1 and comparative examples 1 and 2 is shown in fig. 1, 2 and 3, respectively. The surface of the heat insulation paper in figure 1 has no depression and granular sensation, which proves that aerogel and fiber are basically fused into a whole, figure 2 has partial granular sensation, which proves that the aerogel powder has a falling phenomenon after the silane coupling agent is not added, figure 3 has depression and pits on the surface, and the aerogel powder and the fiber without the dispersing agent are also unevenly dispersed.
Comparing example 1 with comparative example 1, it can be seen that adding a silane coupling agent produces a chemical coupling effect to tightly bond the aerogel material and the plant fibers, which can fix the aerogel powder well and increase the addition of the aerogel to the maximum extent.
Comparing example 1 with comparative examples 1 and 2, it can be seen that the presence of the silane coupling agent and the dispersant can make the aerogel of the aerogel thermal insulation paper disperse more uniformly and have smoother texture.
Examples 2 to 6:
examples 2-6 referring to example 1, the amounts of the components are shown in table 1:
TABLE 1
In examples 4 to 6, 1799 type PVA was used as the adhesive.
Example 7: characterization of aerogel thermal insulation paper
And (3) testing the heat insulation performance: quasi-steady-state flat-wall thermal conductivity measurement method is adopted: the method comprises the steps of utilizing the overall dimension of a caliper test sample, correctly installing the test sample into a test instrument cavity, carrying out testing according to operation steps to obtain a thermal diffusion coefficient, and calculating the thermal conductivity coefficient according to the following formula by combining parameters such as specific heat, density and the like of a material.
k＝a×c×ρ
In the formula: k is a thermal conductivity coefficient; c is the specific heat of the material; ρ is the density of the material.
Results of the experiment
The results of the performance tests of each of the samples obtained in examples 1 to 6 are shown in Table 2.
TABLE 2
The ranking of the heat conductivity test results is as follows: example 1 > 3 > 4 > 2 > 5 > 6. The best addition ratio is shown in example 5, followed by examples 6, 2, 4, 3 and 1, in view of the combination of cost and heat insulation performance.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The preparation method of the aerogel heat insulation paper is characterized by comprising the following steps of:
s1, placing plant fibers in a container, adding excessive deionized water, and fluffing by a fluffer to obtain matrix slurry for later use; the plant fiber is grass fiber, wood fiber or regenerated fiber;
s2, dissolving the adhesive into a transparent solution by using hot water at the temperature of 70-100 ℃ to obtain an adhesive solution for later use; the adhesive is any one of cellulose ether, starch, modified starch and polyvinyl alcohol, and the cellulose ether is selected from carboxymethyl cellulose or hydroxypropyl cellulose;
s3, sieving the aerogel powder by a 40-120-mesh sieve, adding the aerogel powder, an adhesive solution, a silane coupling agent and a dispersing solvent into the slurry obtained in the step S1, uniformly mixing, and fully dispersing in a pulp fluffer; the mass ratio of the plant fiber to the adhesive to the silane coupling agent to the aerogel powder to the dispersing solvent is 100:5 to 20:1 to 5:10 to 30:5 to 20; the dispersion solvent is one or more of ethanol, methanol, glycol or acetone; the silane coupling agent has a structure of Y-R-Si (OR) 3 Wherein Y is-NH 2 Or an epoxy group; the aerogel powder is SiO 2 、Al 2 O 3 Any of inorganic aerogels;
and S4, pouring the uniformly dispersed mixed slurry obtained in the step S3 into a papermaking device for papermaking, and carrying out hot pressing and drying to obtain the aerogel heat insulation paper.
2. The preparation method of the aerogel heat insulation paper as claimed in claim 1, wherein the mass ratio of the plant fiber, the adhesive, the silane coupling agent, the aerogel powder and the dispersing solvent in the step S3 is 100:10 to 20:2 to 5:10 to 20:10 to 20.
3. The preparation method of the aerogel heat insulation paper as claimed in claim 1, wherein the mass ratio of the plant fiber, the adhesive, the silane coupling agent, the aerogel powder and the dispersing solvent in the step S3 is 100:15:3:15:15.
4. the method for preparing aerogel heat insulation paper according to claim 1, wherein the silane coupling agent is KH550 or KH560.
5. The method for preparing the aerogel thermal insulation paper as claimed in claim 1, wherein the disintegration in step S1 is from 6000 to 15000rpm for 5 to 25min.
6. The method for preparing the aerogel thermal insulation paper according to claim 1, wherein the disintegration in the step S1 is relieving at 10000rpm for 15min.
7. The method for preparing aerogel thermal insulation paper as claimed in claim 1, wherein the temperature of the hot water in step S2 is 90 ℃.
8. The method for preparing aerogel thermal insulation paper as claimed in claim 1, wherein the relative molecular mass of the adhesive is 1000-1000000.
9. The method for preparing aerogel thermal insulation paper as claimed in claim 1, wherein the alcoholysis degree of polyvinyl alcohol is 99% and the molecular weight repeat unit is 17.
10. The application of the aerogel heat insulation paper obtained by the preparation method of any one of claims 1 to 9 is characterized in that the aerogel heat insulation paper is made into heat insulation protective sleeves or special heat insulation paper products with various shapes, and is suitable for the fields of daily chemicals, buildings and traffic.
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| CN202210744043.5A CN115162049A (en) | 2022-06-27 | 2022-06-27 | Preparation method and application of aerogel heat insulation paper |
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| CN202210744043.5A CN115162049A (en) | 2022-06-27 | 2022-06-27 | Preparation method and application of aerogel heat insulation paper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115874488A (en) * | 2022-11-10 | 2023-03-31 | 江苏龙冶节能科技有限公司 | Temperature-resistant heat-insulating paper and preparation method thereof |
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| CN115874488A (en) * | 2022-11-10 | 2023-03-31 | 江苏龙冶节能科技有限公司 | Temperature-resistant heat-insulating paper and preparation method thereof |
| CN115874488B (en) * | 2022-11-10 | 2024-05-28 | 江苏龙冶节能科技有限公司 | Temperature-resistant heat-insulating paper and preparation method thereof |
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