CN110506073A

CN110506073A - Thermal insulation expanded PTFE product

Info

Publication number: CN110506073A
Application number: CN201880023234.4A
Authority: CN
Inventors: G·D·达西; J·R·汉拉罕; S·R·阿伯丁; J·W·亨德森; K·J·梅布; A·杜塔; G·D·古勒
Original assignee: WL Gore and Associates Inc
Current assignee: WL Gore and Associates Inc
Priority date: 2017-03-29
Filing date: 2018-03-27
Publication date: 2019-11-26
Also published as: WO2018183225A1; EP3601422A1; JP2020515685A; KR20190127962A

Abstract

Describe heat insulator and product.In one embodiment, heat insulator includes polymer substrate, aerogel particle and varicosity microballoon；Wherein, the amount of aerogel particle is 30 weight % or higher, the amount of polymer substrate is greater than or equal to 20 weight %, and the amount of varicosity microballoon is 0.5 weight % to 15 weight %, and weight percent is the total weight based on polymer substrate, aerogel particle and varicosity microballoon；And in atmospheric conditions, the thermal conductivity of heat insulator is less than 40mW/m K.

Description

Thermal insulation expanded PTFE product

Technical field

The present disclosure relates generally to heat insulator and its product, more particularly, to including thermal insulation particle, polymer matrix The heat insulator of matter and expended microsphere, the thermal insulation particle include such as aerogel particle.

Background technique

Purposes of the aeroge for the application of thermal insulation and the lower thermal conductivity of aeroge is well-known.Satisfactorily Thermal conductance is that greater than about 95% very high porosities of aeroge and the small-bore of aerogel material (are less than air under atmospheric pressure The mean free path size of molecule, or the result less than about 100nm).Since aperture is small, the migration of the air molecule in material by To limitation, and the effect of air transmitted heat reduces, therefore obtains low thermal conductivity.At ambient conditions, the thermal conductivity of air About 25mW/m K (milliwatt/rice Kelvin).Insulator with larger aperture such as foam, cotton-wool, wool and other common The thermal conductivity of heat insulator is about 40mW/m K, and due to radiating with solid conduction, which is higher than the heat of air Conductance.The thermal conductivity of known aerogel powder and bead is about 9~20mW/m K.But the material of this high porosity low-density Material cannot be used for a variety of applications in powder form, because it generates a large amount of dust, so that installation, operation, forming and plastotype are special Difficulty, and further result in safety problem.

The conventional method of manufacture aeroge generally includes to use supercritical fluid extraction.These methods often the following steps are included: Aerogel precursor liquid is poured into mold, by multiple fluid exchange, dry aerogels liquid is to form high porosity Gel structure, and aeroge single piece is formed using supercritical fluid extraction.Such as using supercritical fluid extraction including Method is very time-consuming and not cheap.In addition, the structure of production is rigid, there is low mechanical strength, and forming gas The ability for further moulding or being shaped to required shape after gel rubber material is limited.Flexure when, these materials usually crack or Crush, and with aeroge it is fine grain fall off or " generate dust " and it is known.

In the flexibility and intensity for attempting to increase aerogel material, the U.S. Patent Publication 2002/ of Stepanian et al. 0094426 teaches the aerogel material combined with enhancing structure (especially fluffy fibrous cotton-wadding).Preferably, aeroge is logical The fibrous cotton-wadding structure that combines with the microfibre of random orientation and/or conducting shell is crossed to enhance.In order to form airsetting film, by shape It is poured into cotton-wool at the precursor liquids of aeroge and supercritical drying is to form aeroge.The enhancing aeroge disclosed Structure can dangle, and when flexure crushes than less easily, thin aerogel particle more not easy to fall off.However, due to these Structure lacks plasticity and formability, and cost relevant to supercritical extract step, thus the application of these materials by To limitation.

In order to overcome brittleness usually related with the aeroge of enhancing, the 5th, 786, No. 059 United States Patent (USP) of Frank et al. It teaches the aerogel powder continuous product of formation glued together.Specifically, with the gas of fiber web layer and aerogel particle Gel complex material is preferably formed into pad or panel.Web includes the bicomponent fibre material of two kinds of polymer closely interconnected Material, both polymer closely interconnected have the melting range of lower mild higher temperatures, and aerogel particle is dispersed into these In region.When being heated to lower fusion temperature, the fiber of web is bonded to each other and in conjunction with aerogel particle.Gained The compound arrived have relatively hard structure, when applying mechanical stress, breakage of particles or become with fiber disengaging, make to bring about the desired sensation Gel may fall off from web.

A kind of method for manufacturing aeroge is disclosed in united states patent at the 6th, 172, No. 120 in Smith et al., In, aeroge is as powder rather than integral blocks or piece are formed.The manufacturing method has when forming aeroge without overcritical The advantages of fluid extracting step.But the aeroge of powder type due to its generate a large amount of dust and lack formability without It can be used for a variety of applications.

A kind of material for a variety of applications of No. 7,118,801 US patent teaches of Ristic-Lehmann et al. Material, these applications include the insulation application for clothes, container, pipeline, electronic device etc..Wherein, including aerogel particle and Material disclosed in ' 801 of polytetrafluoroethylene (PTFE) (PTFE) be it is shapable, have low particle deciduous and low thermal conductivity.By this Compound made of material can bend, stretches and distort, and fall off almost without aerogel particle or the funeral of conductibility It loses.

A kind of insulating materials is needed, which can overcome the problems, such as the intrinsic of aerogel powder and compound, such as gas Gel powder lacks formability and compound lacks flexibility, and aerogel particle falls off or generate powder when applying mechanical stress The problem of dirt.Need it is a kind of can be formed it is hydrophobic, high it is ventilative, have high-intensitive and can be used for non-static high flexible application Product (such as varicosity PTFE article) insulating materials.Also need it is flexible, stretchable and flexible, and almost without Fine grained falls off or generates the insulated product of dust.

Summary of the invention

In one embodiment, this disclosure relates to a kind of heat insulator comprising polymer substrate, aerogel particle With varicosity microballoon；Wherein, the amount of aerogel particle is 30 weight % or higher, and the amount of polymer substrate is greater than or equal to 20 weights % is measured, and the amount of varicosity microballoon is 0.5 weight % to 15 weight %, wherein weight percent is based on polymer substrate, gas The total weight of gel particle and varicosity microballoon；And in atmospheric conditions, the thermal conductivity of heat insulator is less than 40mW/m K.

In an alternative embodiment, polymer substrate may include that fluoropolymer, polytetrafluoroethylene (PTFE), varicosity are poly- Tetrafluoroethene, ultra-high molecular weight polyethylene (UHMWPE), varicosity ultra-high molecular weight polyethylene, polyolefin, varicosity polyolefin, poly- ammonia Ester or combinations thereof.In other alternative embodiment, when according to being exposed to Vertical Flame 3 seconds to test, thermal insulation material Material is shown without fusing, without dropping liquid and/or without burn-through.

In other alternative embodiment, the matrix thermal conductivity of heat insulator is greater than 27mW/m in atmospheric conditions K and be less than 39mW/m K.In other alternative embodiment, heat insulator is the form of sheet material or film, wherein matrix It further include a layer or multiple layers on the first side, second side or the first side and second side the two.In other alternative implementation In mode, one layer or multiple layers may include polymeric layer, weaving layer, braiding layer, non-woven layer or combinations thereof.Another In outer alternative embodiment, one layer or multiple layers may include that fluoropolymer, PTFE, polyolefin, varicosity contain Fluoropolymer, varicosity PTFE, varicosity polyolefin, polyurethane or combinations thereof.In other alternative embodiment, it can be used One layer of heat insulator or multiple layers are adhered to varicosity polymer substrate by adhesive continuously or discontinuously, and Described adhesive optionally includes fire proofing.

In another embodiment, present disclose provides the products comprising the heat insulator.Further, certain In embodiment, the product can include but is not limited to gloves insulating cell, footwear insulating cell, clothes, clothes liner, pipe Road insulating materials, low temperature insulation material, electronic device, cooker, household electrical appliance, storage container, food packaging, Key works Drug packing, leaching Water clothes, acoustic material, heat insulator and electrically insulating material.

In another embodiment, this disclosure relates to comprising the varicosity PTFE (ePTFE) that combines thermal insulation particle Heat insulator, the thermal conductivity of the material in atmospheric conditions are less than or equal to 25mW/m K.In an alternative embodiment party In formula, the heat insulator has the heat absorption (peak) at about 380 DEG C.In an alternative embodiment, the thermal insulation Material is monolithic devices.

In an alternative embodiment, the heat insulator is at least containing the tensile strength on length direction Tensile strength in 0.35MPa and transverse direction is at least ePTFE of 0.19MPa.

In another embodiment, the heat insulator may include thermal insulation particle less than 40 weight % and be greater than The polytetrafluoroethylene (PTFE) (ePTFE) of 60 weight %, wherein the thermal conductivity of the composite material in atmospheric conditions is less than or equal to 25mW/m K。

In one or more embodiments that heat insulator combines thermal insulation particle, the particle can be selected from two Silica aerogel particles, pyrogenic silica and combinations thereof.

In another embodiment, the heat insulator includes the varicosity PTFE with node and fibrillar structure, And there is the thermal conductivity less than or equal to 25mW/m K in atmospheric conditions.In addition, the insulating materials may include having The varicosity PTFE of about 380 DEG C of heat absorption (peak).

In another embodiment, this disclosure relates to which a kind of product, the product include first layer, in atmospheric conditions Thermal conductivity is less than or equal to the varicosity PTFE (ePTFE) and the second layer of 25mW/m K, wherein the ePTFE is clipped in described the Between one layer and the second layer.In another embodiment, ePTFE is hydrophobic.Alternatively, the first layer and described At least one of two layers to can be gas impermeable.In addition, at least one of the first layer and the second layer It is impermeable to can be liquid.In an alternative embodiment, ePTFE includes being selected from aerosil and pyrolysis The thermal insulation particle of method silica.

Detailed description of the invention

Including attached drawing provide further understanding of the disclosure, attached drawing is included into this specification and constitutes this explanation A part of book, illustrated embodiment, and together with the description for explaining the principles of this disclosure.

Fig. 1 is that the surface of the heat insulator comprising ePTFE material containing 20% aeroge loading capacity is put at 5000 times The scanning electron micrograph shot under big multiple；

Fig. 2 is that the surface of the heat insulator comprising ePTFE material containing 40% aeroge loading capacity is put at 5000 times The scanning electron micrograph shot under big multiple；

Fig. 3 is that the surface of the heat insulator comprising the ePTFE material with pyrogenic silica is amplified at 5000 times The scanning electron micrograph shot under multiple；And

Fig. 4 is that the surface of the heat insulator comprising ePTFE material containing 60% aeroge loading capacity is put at 5000 times The scanning electron micrograph shot under big multiple.

Specific embodiment

Those skilled in the art should be easily understood that, can be by any amount of method that is configured to act on needed for implementing The various aspects of present disclosure are realized with equipment.It shall yet further be noted that herein with reference to attached drawing be not necessarily drawn to scale, and Amplification is possible to illustrate various aspects of the disclosure, in this regard, attached drawing is not construed as restrictive.

The insulating materials of the disclosure includes thermal insulation particle (such as aeroge etc.) and polymer substrate.The polymer matrix Matter for example can be fluoropolymer, polytetrafluoroethylene (PTFE) (PTFE), ultra-high molecular weight polyethylene (UHMWPE), polyolefin, poly- ammonia Ester or combinations thereof.In some embodiments, the polymer substrate is polytetrafluoroethylene (PTFE), expanded PTFE or its group It closes.The heat insulator can be formed it is hydrophobic, highly-breathable, with high-intensitive product (such as ePTFE membrane, compound Deng), the product can be used for non-static application or Dynamic flexural application.It is flexible by the product that the heat insulator produces , it is extensible and flexible.The dust moreover, heat insulator falls off or generated almost without fine grained.Particle is close Degree is less than about 100kg/m³And thermal conductivity is less than or equal to about 15mW/m at atmospheric conditions (about 298.5K and 101.3kPa) The aerogel particle of K can be used for the insulating materials.It should be understood that term " aeroge " and " aerogel particle " herein can be with It is used interchangeably.

Aeroge is the heat insulator for substantially reducing convective heat transfer and conduction heat transfer.Silica aerogel particles are special Excellent conductance isolation body.The material that aerogel particle is solid, rigid and dry, and can be commercially available in powder form. For example, Smith et al. describes the dioxy formed by the method for advantage of lower cost in the 6th, 172, No. 120 United States Patent (USP) SiClx aeroge.The size of aerogel particle can reduce technology by jet grinding or other sizes and be reduced to required ruler Very little or rank.The size of aerogel particle for insulating materials can be about 1 μm to about 1mm, about 1 μm to about 500 μm, about 1 μ M to about 250 μm, about 1 μm to about 200 μm, about 1 μm to about 150 μm, about 1 μm to about 100 μm, 1 μm of form about to about 75 μ M, about 1 to about 50 μm, about 1 μm to about 25 μm, about 1 μm to about 10 μm or about 1 μm to about 5 μm.In at least one exemplary implementation In mode, the size of the aerogel particle is about 2 μm to about 24 μm.

While not wishing to be limited to theory, but it is believed that the other components of lesser aerogel particle and insulating materials form Mixture more evenly.Therefore, the lesser aeroge of granularity can be used in insulating materials, for example, average particle size be less than or Equal to the aeroge of about 200nm or even 100nm.

The density of the aerogel particle can be less than 100kg/m³, be less than 75kg/m³, be less than 50kg/m³, be less than 25kg/ m³Or it is less than 10kg/m³.In at least one illustrative embodiments, the heap density of the aerogel particle is about 30kg/m³Extremely About 50kg/m³。

Being suitble to the aeroge used in insulating materials includes inorganic aerogels, organic aerogel and their mixture. The non-limiting example of suitable inorganic aerogels includes the gas formed by the inorganic oxide of silicon, aluminium, titanium, zirconium, hafnium, yttrium and vanadium Gel.Suitable organic aerogel for insulating materials includes but is not limited to by carbon, polyacrylate, polystyrene, poly- third Alkene nitrile, polyurethane, polyimides, poly furfuryl alcohol, phenol furfuryl alcohol, melamino-formaldehyde, resorcinol formaldehyde (resorcinal Formaldehyde), the airsetting of cresols, formaldehyde, polycyanurate, polyacrylamide, epoxides, agar and agarose preparation Glue.In at least one illustrative embodiments, insulating materials contains inorganic aerogels, such as silica.Suitable for the disclosure Another example of thermal insulation particle be pyrogenic silica.

In addition, for insulating materials aeroge can be it is hydrophilic or hydrophobic.In the exemplary embodiment, aeroge It is hydrophobic or part is hydrophobic, and thermal conductivity is less than about 15mW/m K.It should be understood that particle size reduction technique (as ground) can be with shadow Some outer surface groups of hydrophobic aerogel particles are rung, so that part of the surface (retains in aerogel particle and dredges in hydrophily It is aqueous).The aeroge of partially hydrophobic can show to enhance with the associativity of other compounds, and can be used for needing to combine answers In.

The heat insulator of the disclosure further includes polymer substrate or varicosity polymer substrate, wherein polymer substrate is Fluoropolymer, polytetrafluoroethylene (PTFE), expanded PTFE, ultra-high molecular weight polyethylene (UHMWPE), varicosity super high molecular weight Polyethylene, polyolefin, varicosity polyolefin, polyurethane or combinations thereof.As used herein, super high molecular weight means polymer Number-average molecular weight in the range of 3,000,000g/mol to 10,000,000g/mol.It in some embodiments, can be by gathering Tetrafluoroethene (PTFE) particle prepares polymer substrate.The size of PTFE particle is less than aeroge in the exemplary embodiment The size of particle.However, it should be understood that size and the approximate PTFE particle of aerogel particle also can be used.In general, PFTE With having a size of from about 50nm or higher primary granule or having a size of from about 600 μm or smaller PTFE aggregation is present in dispersion In.PTFE dispersion is the aqueous colloidal dispersions of the high molecular weight PTFE particle formed by emulsion polymerization.PTFE dispersion SSG can be equal to or less than about 2.2.

The heat insulator is formed by preparing the mixture of aeroge and PTFE particle, for example, by forming gas The mixture of the water-borne dispersions of gel particle and PTFE dispersion is formed.Aeroge/PTFE granulate mixture may include small In the aerogel particle of about 90 weight %, the aerogel particle less than about 85 weight %, less than about the aeroge of 80 weight % Grain, the aerogel particle less than about 75 weight %, the aerogel particle less than about 70 weight %, less than about the airsetting of 65 weight % Glue particle, the aerogel particle less than about 60 weight %, the aerogel particle less than about 55 weight % are less than about 50 weight % Aerogel particle.In some embodiments, aerogel particle can less than 40%, less than or equal to 35%, be less than or wait Amount in 30%, less than or equal to 25%, less than or equal to 20%, less than or equal to 15% or less than or equal to 10% exists In the mixture.Aerogel particle can about 10% to 40% amount be present in mixture.In illustrative embodiments In, the aerogel particle can amount less than 40% exist.

In addition, aeroge/PTFE granulate mixture may include greater than about the PTFE particle of 10 weight %, greater than about 15 weights Measure the PTFE particle of %, the PTFE particle of greater than about 20 weight %, the PTFE particle of greater than about 25 weight %, greater than about 30 weights Measure the PTFE particle of %, the PTFE particle of greater than about 35 weight %, the PTFE particle of greater than about 40 weight %, greater than about 45 weights Measure the PTFE particle of % or the PTFE particle of greater than about 50 weight %.In the exemplary embodiment, PTFE particle can be big In or equal to 60 weight %, it is greater than or equal to 65 weight %, is greater than or equal to 70 weight %, is more than or equal to 75% or big It is present in mixture in or equal to 80% amount.The PTFE particle can about 60% to 90% amount exist.Exemplary In embodiment, the amount that the PTFE particle can be greater than 60% is present in aeroge/PTFE granulate mixture.

It can be by the ratio between weight percent of aeroge and PTFE in change mixture come part accommodation property, such as thermal conductivity Rate causes dust, formability and intensity.

The heat insulator of the disclosure is optionally including additional component.Optional component can be added to aeroge/ In PTFE binder mixtures, for example, finely divided opacifier, to reduce radiant heat transfer and improve hot property, optional component example It such as include carbon black, titanium dioxide, iron oxide, silicon carbide, molybdenum silicide, manganese oxide, (wherein alkyl includes 1- to polydialkysiloxane 4 carbon atoms), fire proofing or combinations thereof.In addition, can for example be optionally added into polymer, dyestuff, plasticizer, thickener, Various synthesis and natural fiber, Lai Zengjia mechanical strength and realization such as color and thermal stability, the property of elasticity.Optional group Divide and is preferably added with the amount for being less than aeroge/PTFE mixture about 10%.

In another embodiment, heat insulator further includes expended microsphere, such as Expancel expended microsphere. Heat insulator is expanded into foamed material it is foreseeable that other materials, inflatable ball or foaming agent can be used.Following institute It states, the heat insulator containing expended microsphere is condensed altogether and is configured to band.Then, the band can be heated to being enough The temperature of the microballoon is expanded, so that the band is expanded into foam insulating material.The amount and processing temperature of expended microsphere can Influence the thickness of final products.In some embodiments, expended microsphere and thickness containing about 10 weight % be may make The band for being about 1 millimeter expansion, is up to about 8 millimeters or higher heat insulator to obtain thickness.It is unrestricted at other In illustrative embodiments, for example, the foaming heat insulation material of 4mm thickness can be obtained in heating and expansion if band is 2mm thick Material.The foaming heat insulator is flexible, compressible, and can substantially completely be replied.In addition, the foaming Heat insulator has low density, for example, density is less than 0.5g/cm³Or it is less than 0.4g/cm³Or it is less than 0.3g/cm³Or Less than 0.2g/cm³Or it is less than 0.1g/cm³。

In some embodiments, heat insulator includes polymer substrate, aerogel particle and varicosity microballoon.Another In a little embodiments, heat insulator can be substantially made of polymer substrate, aerogel particle and varicosity microballoon, Huo Zheke To be made of polymer substrate, aerogel particle and varicosity microballoon.Based on aerogel particle, PTFE particle and expended microsphere Total weight, expended microsphere can about 0.5 weight % to 15 weight % amount exist.In other embodiments, it may expand Microballoon can be greater than about 0.5 weight % to up to 14 weight %, 13 weight %, 12 weight %, 11 weight %, 10 weight %, 9 Weight %, 8 weight %, 7 weight %, 6 weight %, 5 weight %, 4 weight %, 3 weight %, 2 weight % or 1 weight % exist. In other embodiments, expended microsphere can about 5% to 14% or 6% to 13% exist, wherein all weight hundred Dividing ratio is based on the total amount of polymer substrate, aerogel particle and expended microsphere.As used herein, phrase " base This it is upper by ... form " mean that heat insulator contains varicosity polymer substrate, aerogel particle, varicosity microballoon, optionally less than The component of 10 weight % listed as additional combinations and any other component less than 2 weight %, these other components meetings Substantially influence property as described herein, such as thermal conductivity.

The mixture of aeroge and PTFE particle in carrier liquid (such as water, water-insoluble alcohol or combinations thereof) can be with Condensation altogether, such as mixture is condensed by stirring or by adding coagulating agent.The mixture condensed altogether includes aeroge The substantially homogeneous blend of grain and PTFE particle.The mixture of total condensation can be at least partially dried (such as in an oven) simultaneously It is pressed into prefabricated component.Then the prefabricated component can be extruded as band, be calendered to required thickness, and expand (uniaxially or biaxially) At varicosity PTFE (ePTFE) material of thermal insulation.It in other embodiment, can be by stirring or by addition coagulating agent Condense the aerogel particle in carrier liquid, polymer substrate (such as PTFE particle) and the mixture of expended microsphere altogether. The mixture condensed altogether includes the substantially homogeneous blend of aerogel particle, polymer substrate particle and expended microsphere.It can Mixture is at least partially dried (such as in an oven) and be pressed into prefabricated component.Then the prefabricated component can be extruded as band Material is calendered to required thickness, and expands (uniaxially or biaxially) into heat insulator.The mistake that band is uniaxially or biaxially expanded Cheng Tongchang is carried out at elevated temperatures, such as higher than the temperature of expended microsphere expansion.The expansion of expended microsphere may make It forms wherein expended microsphere not expand completely, expended microsphere expands completely, the group of expended microsphere rupture or above situation The varicosity microballoon of conjunction.

Obtaining material is thermal insulation, thermal conductivity (k) be less than or equal to 40mW/m-K, 39mW/m-K, 38mW/m-K, 37mW/m-K、36mW/m-K、35mW/m-K、34mW/m-K、33mW/m-K、32mW/m-K、31mW/m-K、30mW/m-K、29mW/ M-K, 28mW/m-K, 27mW/m-K, 26mW/m-K, 25mW/m-K, 24mW/m-K, 23mW/m-K, 22mW/m-K or 21mW/m-K, Less than or equal to 20mW/m-K, or it is less than or equal to 15mW/m-K (in atmospheric conditions, i.e. 298K and 101.3kPa).Such as Visible in Fig. 1-4, ePTFE has node and fibrillar structure.Also, ePTFE is shown in length direction and transverse direction It is upper that there is high tensile strength.In addition, ePTFE has highly-breathable, MVTR is at least 5,000g/m²/ 24 hours, at least 10, 000g/m²/ 24 hours, at least 20,000g/m²/ 24 hours or at least 30,000g/m²/ 24 hours or higher.Such as institute herein It uses, the ventilative product for meaning description has at least 5,000g/m²/ 24 hours gas permeabilities.

It is existing in surprise, in the heat insulator comprising varicosity polymer substrate, aerogel particle and varicosity microballoon, The existing amount of aerogel particle is 30 weight % or higher, the amount of varicosity polymer substrate be more than or equal to 20 weight % and The amount of expended microsphere be 0.5 weight % to 15 weight %, such heat insulator according to be exposed to Vertical Flame test (being hereafter described) 3 seconds shows when testing without fusing, without dropping liquid and/or without burn-through.Flammable test method is below It is described, and it is based on Federal Specification 191A method 5903.In some embodiments, fire-retardant heat insulator packet Include expanded PTFE matrix, aerogel particle and varicosity microballoon, wherein heat insulator is free of the fire-retardant material of any addition Material.As used herein, fire-retardant to mean when being tested according to following combustibility, the anti-fusing of heat insulator, Anti- dropping liquid, burn-through resistant or the combination with these properties.

It is optionally possible to by heat insulator be laminated adhere to or be otherwise in connection with one or more extra plays with Form product.For example, heat insulator is usually the form of the sheet material or film with the first side and second side, wherein thickness is small In width and/or length.One or more layers can be adhered to heat insulator the first side, second side or the first side and Both second side.One or more of extra plays can be polymeric layer, weaving layer, braiding layer, non-woven layer or combinations thereof. Polymeric layer can be non-porous layer, microporous layers, breathable or combinations thereof.For example, one or more of layers can be it is fluorine-containing Polymer, PTFE, polyolefin, varicosity fluoropolymer, varicosity PTFE, varicosity polyolefin, polyurethane or combinations thereof.It is one Or multiple layers can be adhered to heat insulator using adhesive, welding, calendering, coating or combinations thereof.In some embodiments In, heat insulator can have the varicosity tetrafluoroethene layer for being adhered to both the first side, second side or the first side and second side. In some embodiments, the product may include multiple layers, for example, heat insulator, which can have, is integrated to one or both sides PTFE layers of varicosity, to obtain the composite material with 2 layers or 3-tier architecture.One or more additional textile layers, such as knit The divine force that created the universe, textile fabric, non-woven fabric or combinations thereof can be adhered to composite material.In general, jointing material can be used to adhere to weaving Product layer.As known in the art, can mode continuously or discontinuously adhesive is applied to heat insulator, be applied to weaving Product, or it is applied to both heat insulator and textile.In some embodiments, adhesive optionally includes fire-retardant material Material.

The one or more textile layer can be weaving layer, braiding layer, non-woven layer or combinations thereof.In other implementation In mode, weaving, establishment or nonwoven textiles can be anti-flammability woven textiles, anti-flammability Woven textiles or anti-flammability Nonwoven textiles.Suitable textile layer is well known in ability, and it may include elastic and non-resilient textile, such asPolyurethane, polyester, polyamide, acrylic compounds, cotton, wool, silk, flax, artificial silk, flax, jute；Resistance Combustion property textile, such asAromatic polyamides (can be bought from the E.I.Du Pont Company of Wilmington, DE), aromatics Polyamide, retardant cotton, polybenzimidazoles, polyparaphenylene -2,6- benzo dioxazole, Flame retardant staple silk, improvement acrylic compounds, Improve acrylic blend, polyamine, charcoal, glass fibre or combinations thereof.

In one embodiment, thermal insulation ePTFE material is used as the insulator in footwear product.EPTFE material can be with In any part of footwear product, including upper portion, heel, toe part or sole portion (bottom).In addition to hot exhausted Except edge ePTFE, or as the substitution of thermal insulation ePTFE, thermal insulation foamed material can be used as the insulator in footwear product.Example Such as, thermal insulation foamed material can be used for upper portion, heel, toe part and/or sole portion (bottom).At at least one In illustrative embodiments, the footwear product of insulation includes at least one of the upper portion of footwear product thermal insulation EPTFE and thermal insulation foamed material in sole (bottom) part of footwear product.As used herein, term " footwear Product " is meant including shoes and boots.

Apart from the above, it is believed that the cause dusting material shapable, can be molded, low with lower thermal conductivity falls into this public affairs In the range of opening.These materials have enough mouldabilities, to form flexibility in one or more directions with curve Three-dimensional structure or shape.In addition, the material is optionally formed the stretchable structure for generating minimum dust when stretching.They can be with Convoluted hose or pipeline are to play insulation effect.

Heat insulator as described herein can be used for a variety of applications, including insulating materials and compound prepared therefrom, with For dress ornament, such as gloves and footwear insulating cell, clothes, clothes liner, pipe-line wrapping material, low temperature insulation material, electronics device Part, cooker, household electrical appliance, storage container and food and medicine packaging, immersion clothes and difunctional insulation, such as sound insulation, electrical isolation and Thermal insulation etc..

Above synoptically and in conjunction with specific embodiment describe disclosure of this application.To this field It is obvious to the skilled person that without departing from the spirit or scope of the disclosure defined by the appended claims the case where Under, the disclosure can be carry out various modifications and be changed.

Test method

Although also alternatively using ordinary skill it should be understood that certain methods and apparatus are described below Personnel determine applicable any method or equipment.

Vapor permeability tests (MVTR)

The MVTR of each sample fabric is measured according to the general introduction of ISO 15496, the difference is that, it is based on equipment Vapor permeability (WVPapp) simultaneously utilizes following transfer equation, and the vapor permeability (WVP) of sample is scaled MVTR Vapor permeability (MVTR).

MVTR=(value × 24 Δ P)/((1/WVP)+(1+WVPapp value))

In order to ensure comparable as a result, before testing by sample under 73.4 ± 0.4 °F and 50 ± 2% relative humidity (rH) Adjustment 2 hours, and the water of water-bath is constant at 73.4 °F ± 0.4 °F.

MVTR is measured to each sample, and the unit of result is g/m²/ 24 hours.

Tensile strength

Using equipped with level clamp (flat-faced grip) and 0.445 thousand Ns of (kN) load cellsThe tensile strength of 5565 tester for elongation measurement film.Gauge length is 6.35cm, and crosshead speed is 50.8cm/ minutes (strain rate=13.3%/second).In order to ensure comparable as a result, laboratory temperature is maintained at 68 °F (20 DEG C) to 72 °F (22.2 DEG C) to ensure comparable result.If sample is broken at grip interface, data are abandoned.

For longitudinal direction (length direction) stretching strength measurement, the larger size of sample is " off line " in other words square along machine direction To orientation.Transverse tensile strength is measured, the larger size of sample is orientated perpendicular to machine direction, also referred to as " crossing net " side To.Then the thickness of sample is measured using three rich (Mitutoyo) 547-400 total head (Absolute) callipers.Then it is stretching Each sample is tested on tester respectively.Each sample measures three different parts.It uses peak load three times (i.e. peak force) The average value of measurement.

The tensile strength of vertical and horizontal is calculated using following formula:

Tensile strength=peak load/sectional area

The average value that crossing net three times measures is recorded as vertical and horizontal tensile strength.

Thickness

Thickness of sample is measured with the integral thickness measurement of thermal conductivity instrument.[thermal conductivity instrument is Massachusetts Suo Gesi's The 314 model thermal conductivity instrument of Laser Comp Fox of Laser Comp company (Laser Comp Saugus, MA)].Record Secondary measurement result.

Thermal conductivity measures (under compression)

The thermal conductivity of the sample of the disclosure is measured using the heat-flow meter Conduction Coefficient Detector Basing of customization, according to ASTM The introduction of C518, and (about 298K and 101.3kPa) applies compression in atmospheric conditions.Tester is by being equipped with heat-flow sensor [model FR-O25-TH44033, the concept engineering company (Concept Engineering) of the old plug Brooker in Connecticut] The temperature sensor (thermistor(-ter)) for heating aluminium sheet and being embedded in its surface, and the second aluminium sheet for being maintained at room temperature (equally have embedding Enter the temperature sensor on its surface) composition.

The temperature of heating plate is maintained at 303.15K, and the temperature of " cold " plate is maintained at 298.15K simultaneously.The diameter of each plate It is about 10cm.By applying weight to the pivotal arm connecting with lower panel come compression sample.Sample under compressive state Thickness is measured by digital encoder, and the digital encoder is calibrated with metal gasket, the digital micrometer of the metal gasket (model ID-F125E, three Feng Gongsi of Japan) are counted to measure.Usually after being placed on sample and estimating and reach stable state in instrument Hot-fluid measurement is obtained in about 2-5 minutes.Thermal conductivity: k=L* is calculated by the heat flow and thickness of sample that measure according to the following formula Q, wherein k is the thermal conductivity as unit of mW/m K, and L is the thickness of sample as unit of m, and Q is with mW/m²K is the heat of unit Flow.Record the result of single measurement.

Thermal conductivity (no compression)

Also thermal conductivity is measured under conditions of not compression sample.The heat of the sample 314 model of Laser Comp Fox Conductance analyzer (the Laser Comp company of Massachusetts Suo Gesi) measures.Record single measurement result.

Air-flow measurement (ATEQ)

Air-flow measurement, the instrument are carried out with ATEQ model D520 (the ATEQ company of state of Michigan Li Funiya) instrument It is 2.99cm that device, which is equipped with flow area,²Rounded seal.It is recorded twice the average value of measurement.

(Gurley) number in lattice

With (the model 4340, by the Ge Li precision instrument company (Gurley of New York Troy of densometer in lattice Precision Instruments Troy, NY) manufacture) sample is measured to the resistance of air stream.As a result it is indicated with lattice mileage, institute Stating lattice mileage is under the pressure drop of 4.88 inches of high water columns, and 100 cubic centimetres of air passes through 1 square inch of test sample Time (unit is the second).Record single measurement result.

Water entry pressure (WEP)

Water entry pressure provides a kind of method immersed for testing water through film and/or fabric.Test sample is clipped in Between a pair of of test board, it is careful not to damage.The plate of lower part is able to use water and applies pressure to a part of sample.By one Paper handkerchief placement plate is opened at the top of the sample between the plate on non-pressurised side, as the instruction proved into water.Then with small increment It pressurizes to sample, until first visible signs of the water by paper handkerchief show breakthrough pressure or enter pressure.The pressure is remembered Record is water entry pressure.Record single measurement result.

Flammable test method

Will the heat insulator sample having a size of from about 75 millimeters of (mm) × 200mm in 21 DEG C and 50% ± 2% relative humidity It is lower to adjust 2 hours, then tested.The sample through overregulating is placed in the sample sack of sealing after adjustment, for surveying It is further taken out when examination.

As described in Federal Specification 191A method 5903, all tests are carried out in laboratory fume hood and burning cabinet. According to the regulation of NFPA 1971-34 (2000 editions), using moveable fischer (Fisher) burner as flame source, Butane, which is provided with, by steam supply valve, adjuster, needle valve and flexible hose arrangement (is capable of providing the one of 17.3kpa+-1.7kpa The gas flow of cause).Sample bottom is centrally placed in the position of about 38mm higher than fischer burner top by steel specimen holder. Said burner and sample are placed in burning cabinet.

Sample levels are placed on specimen holder and are held in place using the binder clip of medium size.By laboratory The air stream of draught cupboard is arranged lower.In burning cabinet, burner is positioned far from specimen holder.It closes needle valve and opens gas supply Valve.It opens needle valve and puts burner.Flame height is adjusted to 75mm.Make burner combustion 1 minute, if it is desired, weight New adjustment flame height.Then the mobile burner below sample, is positioned as close to sample center for flame, starts timing Device, clock for 3 seconds.At the end of 3 seconds, burner is removed from sample lower section.If sample does not burn or after removing flame Do not extinguish immediately, then timer stops timing.If sample combustion, timer is made to continue timing until fray-out of flame.For Burning time after determining, the time measured from timer subtract 3 seconds and record result.Also record any fusing, dropping liquid Or hole formational situation.It is formed to be referred to as by the hole of ablation or burning and be burnt, equally recorded.Fusing, dropping liquid or burning Perforating causes test sample that can not pass through test.

Embodiment

Embodiment 1

Obtain (Dubonnet The Moore Co. (the E.I.DuPont de purchased from Wilmington, DE of PTFE 601 Nemours, Inc., Wilmington, DE)) and aeroge (Enova aeroge MT1200, the Bostonian Kappa in Massachusetts Special company (Enova Aerogel MT 1200, Cabot, Boston, MA)) dispersion.Make PTFE as follows It is condensed altogether with aeroge.91 are restrained oneself alcohol (PN H13303-4L, the Ritchie the Sigma A De company of St. Louis (Sigma Aldrich St Louis, MO)) it is added in 14.4 kilograms of water, in Silverson model EX60 mixer (Ma Sazhu Fill in Silverson Mechanology Inc. (Silverson Machines Inc, East Longmeadow MA) of state Dong Langmeiduo) in Mixing 1 minute, impeller speed 1500rpm.Mixing continues to soak (about 6-10 minutes) completely to aeroge.Then 3.46 are added Kilogram PTFE dispersion, mixer speed increase to 1500rpm, continue 1.5 minutes.Obtained coagulation is passed through into Reemay piece (Reemay company (item#2014-686, Reemay, the Old Hickory of number 2014-686, the old Xi Keli in Tennessee State TN it)) is dehydrated, it is then 24 hours dry at 165 DEG C in forced air draft oven.

Then by obtained drying coagulation and ISOPAR K (1kg/kg) (Exxon Mobil of Houston, Texas Chemical company (Exxon Mobile Chemical, Houston TX)) blending, then it is compressed to cylindrical preform.Then will Prefabricated component is squeezed out by cylinder, to provide the wet bands material of width 15.2cm and thickness 3.7mm.

Wet bands material is calendered to 2.2mm thickness, it is 4 minutes dry in the forced air draft oven for being set as 150 DEG C, then 250 DEG C re-dry 4 minutes.

Then by the dry band through rolling as follows in two directions in 250 DEG C of twin shaft expansions simultaneously: long Degree direction expansion ratio is 8:1, and transverse direction expansion ratio is 18:1, and rate is 500%/second.

Obtained thermal insulation ePTFE membrane has the property that the tensile strength of length direction and transverse direction is respectively 1.54MPa and 1.53MPa；With a thickness of 0.36mm；Thermal conductivity in uncompressed situation is 21mW/m-K；Thermal conductivity under 5psi compression Rate is 8.9mW/m-K；MVTR (MDM) is 32508g/m²/ 24 hours；Lattice mileage is 0.7 second；ATEQ air under 4.5 millibars of pressure drops Flow is 6.2l/hr-cm²；And entering hydraulic pressure (WEP) is 29psi.The scanning electron microscopy of 5000 times of amplification factors on surface shines Piece (SEM) is shown in Fig. 1.Show node (10) and fibrinogen (20).

Embodiment 2

Thermal insulation ePTFE membrane proceeds as follows preparation.Obtain (the Du Pont purchased from Wilmington, DE of PTFE 601 Interior The Moore Co. (E.I.DuPont de Nemours, Inc., Wilmington, DE)) and aeroge (Enova aeroge MT1200, the Bostonian Cabot Corporation in Massachusetts (Enova Aerogel MT 1200, Cabot, Boston, MA)) Dispersion.Condense PTFE and aeroge altogether.By 136 restrain oneself alcohol be added 15.1 kilograms of water in, with The impeller speed of 1500rpm mixes 1 minute.Speed slows down to 500rpm, is slowly added to 363 grams of aerosils.Mixing Continue to soak (about 6-10 minutes) completely to aeroge.Then 2.59 kilograms of PTFE dispersions are added, mixer speed increases to 1500rpm continues 1.5 minutes.The coagulation made is dehydrated by Reemay piece, then at 165 DEG C in air oven It is 24 hours dry.

Then obtained drying coagulation and ISOPAR K are blended with the ratio of 1.5kg/kg, is then compressed to cylinder Prefabricated component.Then prefabricated component is squeezed out by cylinder, to provide the wet bands material of width 15.2cm and thickness 3.7mm.

Then, by the dry band through rolling as follows in two directions in 250 DEG C of twin shaft expansions simultaneously: vertical It is 3:1 to direction expansion ratio, transverse direction expansion ratio is 6:1, and rate is 500%/second.

Obtained thermal insulation ePTFE membrane has the property that the tensile strength of length direction and transverse direction is respectively 0.59MPa and 0.7MPa；With a thickness of 0.86mm；Thermal conductivity in uncompressed situation is 21mW/m-K；Thermal conductivity under 5psi compression Rate is 10mW/m-K；MVTR (MDM) is 9798g/m²/ 24 hours；Lattice mileage is 1.4 seconds；ATEQ air stream under 4.5 millibars of pressure drops Amount is 2.7l/hr-cm²；And entering hydraulic pressure (WEP) is 34psi.The scanning electron micrograph of 5000 times of amplification factors on surface (SEM) it is shown in Fig. 2.Show node (10) and fibrinogen (20).

Embodiment 3

Another thermal insulation ePTFE membrane proceeds as follows preparation.PTFE 601 is obtained (purchased from Wilmington, DE Dubonnet The Moore Co. (E.I.DuPont de Nemours, Inc., Wilmington, DE)) and pyrogenic silica The dispersion of (aeroge R812, the Ying Chuan industrial group (Evonik Industries AG, Hanau Germany) of Hanau, Germany) Body form.Condense PTFE and pyrogenic silica altogether.By 280 restrain oneself alcohol be added 23 kilograms of water in, with The impeller speed of 1500rpm mixes 1 minute.Impeller speed is down to 500rpm, is slowly added to 750 grams of pyrogenic silicas.After Continuous mixing 15 minutes.Then 4.4 kilograms of PTFE dispersion is added, mixer speed increases to 1500rpm, continues 3.33 points Clock.Obtained coagulation is dehydrated using Reemay piece, then 165 DEG C drying 24 hours in air oven.

Then, by the ISOPAR K and 5% lauric acid (PN L556, Missouri of obtained drying coagulation and 95 weight % The Sigma-Aldrich company of state St. Louis) it is blended with the amount of 1.1kg/kg, it is subsequently compressed into cylindrical preform.So Prefabricated component is squeezed out by cylinder afterwards, to provide the wet bands material of width 15.2cm and thickness 3.4mm.

Wet bands material is calendered to 2mm thickness, it is dry in the forced air draft oven for being set as 250 DEG C.

Then by the dry band through rolling as follows in two directions in 280 DEG C of twin shaft expansions simultaneously: two Expansion ratio=the 6:1 in a direction, expansion rate=500%/second of both direction.

Obtained thermal insulation ePTFE membrane has the property that the tensile strength of length direction and transverse direction is respectively 0.35MPa and 0.19MPa；With a thickness of 0.86mm；Thermal conductivity in uncompressed situation is 23mW/m-K；Thermal conductivity under 5psi compression Rate is 16mW/m-K.The scanning electron micrograph (SEM) of 5000 times of amplification factors on surface is shown in Fig. 3.Show node (10) and fibrinogen (20).

Embodiment 4

Obtain (Dubonnet The Moore Co. (the E.I.DuPont de purchased from Wilmington, DE of PTFE 601 Nemours, Inc., Wilmington, DE)) and aeroge (Enova aeroge MT1200, the Bostonian Kappa in Massachusetts Special company (Enova Aerogel MT 1200, Cabot, Boston, MA)) dispersion.Make PTFE as follows It is condensed altogether with aeroge.181 alcohol of restraining oneself are added in 15.7 kilograms of water, are mixed 1 minute with the impeller speed of 1500rpm.Impeller Speed is down to 500rpm, is slowly added to 544 grams of aerosils.Mixing continues to soak (about 6-10 points completely to aeroge Clock).Then 1.73 kilograms of PTFE dispersions are added, mixer speed increases to 1500rpm, continues 1.5 minutes.It is solidifying by what is obtained Tie object by Reemay piece (number 2014-686, the old Xi Keli in Tennessee State Reemay company (item#2014-686, Reemay, Old Hickory TN)) dehydration, it is then 24 hours dry at 165 DEG C in forced air draft oven.

Then obtained drying coagulation is then compressed to cylindrical prefabricated with ISOPAR K (1.5kg/kg) blending Part.Then prefabricated component is squeezed out by cylinder, to provide the wet bands material of width 15.2cm and thickness 3.7mm.

Then by the dry band through rolling as follows in two directions in 250 DEG C of twin shaft expansions simultaneously: long Degree direction expansion ratio is 4:1, and transverse direction expansion ratio is 6:1, and rate is 500%/second.

Obtained thermal insulation ePTFE membrane has the property that the tensile strength of length direction and transverse direction is respectively 0.7MPa and 0.27MPa；With a thickness of 1.1mm；Thermal conductivity in uncompressed situation is 22mW/m-K；Thermal conductivity under 5psi compression For 12.2mW/m-K；Lattice mileage is 0.7 second；ATEQ air stream is 5.2l/hr-cm under 4.5 millibars of pressure drops²；And enter hydraulic pressure It (WEP) is 28psi.The scanning electron micrograph (SEM) of 5000 times of amplification factors on surface is shown in Fig. 4.Show node (10) and fibrinogen (20).

Comparative examples A

PVOH, which is used, as polymer substrate uses heat insulator to prepare to compare.In 4 liters of plastic barrels, merge 50 grams (g) unexpanded Expancel 951DU 120 is [by Akzo Nobel N.V. of the state of Nevada of Amsterdam, the Netherlands (Akzo Nobel) production] and 50gMT1200 aerogel particle is [by the card of Massachusetts classic city Bo Te company (Cabot Corporation) production].In a separate container, by by 250 millimeters (ml) of Ai Ermo ox head Glue (Elmer ' s Glue All) --- adhesive based on PVOH) --- it is stirred with the 400ml water in independent container. Then, the mixture of PVOH and water are poured into the plastic barrel containing aeroge and Expancel particle.Bucket is sealed and passed through Tumble mixed dismisses the consistency of cream until reaching hardness.

Then PTFE separated type material is placed on platform, is used in combinationMT1200 aerogel particle gently dusting with It prevents from clinging, the aeroge of golf-ball-size/Expancel/PVOH mixture aliquot is then placed on separated type material On, and use the disk for being wrapped with that the paperboard tube that the diameter of PTFE separated type material is 90mm is rolled into about 3mm thickness and diameter is 150mm. This disk forming process is repeated to another sample, and resulting disk and separated type material are put into togerther 150 DEG C of bakings About 30 minutes (dividing) in case, cause Expancel expansion, then moves in 100 DEG C of baking ovens and be completely dried it overnight.Gained Material with a thickness of 6.58mm.

Embodiment 5

Heat insulator proceeds as follows preparation.So that (the Dubonnet purchased from Wilmington, DE of PTFE 601 The Moore Co. (E.I.DuPont de Nemours, Inc., Wilmington, DE)) and aeroge ( MT 1200, the Bostonian Cabot Corporation in Massachusetts (Enova Aerogel MT 1200, Cabot, Boston, MA)) point Granular media condenses altogether in the following way.308 alcohol of restraining oneself are added in 23.9 kilograms of (kg) water, with the impeller speed of 1500rpm Degree mixing 1 minute.Speed slows down to 500rpm, is slowly added to 817g'sAerogel particle.Mixing continues to gas Gel particle soaks (about 6-10 minutes) completely.Then the PTFE dispersion of 2.17kg and the Expancel 951DU of 136g is added 120, mixer speed increases to 1500rpm, continues 1.5 minutes.The coagulation made is dehydrated by Reemay piece, is then existed It is 24 hours dry at 125 DEG C in air oven.

Then obtained drying coagulation and ISOPAR K are blended with the ratio of 1.04kg/kg, is then compressed to cylinder Shape prefabricated component.Then prefabricated component is squeezed out by cylinder, to provide the wet bands material of width 15.2cm and thickness 3.7mm.Wet bands material is rolled It is 4 minutes dry in the forced air draft oven for being set as 150 DEG C to the thickness of 0.78mm, then 190 DEG C re-dry 4 minutes.Most Whole drying steps cause Expancel to expand.This become larger leads the xerantic band through rolling upper pair simultaneously in two directions Axis expansion.Heat insulator with a thickness of 2.25mm, it is uncompressed under thermal conductivity be XX mW/mK, MVTR 3086g/m²/24 Hour.

Embodiment 6

So that (Dubonnet The Moore Co. (the E.I.DuPont de purchased from Wilmington, DE of PTFE 601 Nemours, Inc., Wilmington, DE)) and aeroge (1200 aeroge of MT, Massachusetts boss Cabot Corporation (Enova Aerogel MT 1200, Cabot, Boston, MA)) dispersion in the following way altogether Condensation.308 alcohol of restraining oneself are added in 23.9 kilograms of water, are mixed 1 minute with the impeller speed of 1500rpm.Speed slow down to 500rpm is slowly added to 817 gramsAeroge.Mixing continues to soak (about 6-10 minutes) completely to aeroge.So The PTFE dispersion of 2.17kg and 951 DU 120 of Expancel of 13.6g are added afterwards, mixer speed increases to 1500rpm, Continue 1.5 minutes.The coagulation made is dehydrated by Reemay piece, then small in 125 DEG C of dryings 24 in air oven When.

Then obtained drying coagulation and ISOPAR K are blended with the ratio of 1.04kg/kg, is then compressed to cylinder Shape prefabricated component.Then prefabricated component is squeezed out by cylinder, to provide the wet bands material of width 15.2cm and thickness 3.7mm.Wet bands material is rolled To 0.78mm thickness, dry 4 minutes in the forced air draft oven for being set as 150 DEG C, then 190 DEG C re-dry 4 minutes.Final Drying steps cause Expancel to expand.This become larger leads the xerantic band through rolling upper twin shaft is swollen simultaneously in two directions It is swollen.Heat insulator with a thickness of 1.25mm, it is uncompressed under thermal conductivity be XX mW/mK, MVTR 4475g/m²/ 24 hours.

Comparative example B

So that (Dubonnet The Moore Co. (the E.I.DuPont de purchased from Wilmington, DE of PTFE 601 Nemours, Inc., Wilmington, DE)) and aeroge (Enova aeroge MT 1200, the Bostonian card in Massachusetts Bert company (Enova Aerogel MT 1200, Cabot, Boston, MA)) dispersion condense altogether in the following way. 308 alcohol of restraining oneself are added in 23.9 kilograms of water, are mixed 1 minute with the impeller speed of 1500rpm.Speed slow down to 500rpm is slowly added to 817 gramsAeroge.Mixing continues to soak (about 6-10 minutes) completely to aeroge. Then the PTFE dispersion and 272 grams of 951 DU 120 of Expancel of 2.17kg is added, mixer speed increases to 1500rpm continues 1.5 minutes.The coagulation made is dehydrated by Reemay piece, then at 125 DEG C in air oven It is 24 hours dry.

Then obtained drying coagulation and ISOPAR K are blended with the ratio of 1.04kg/kg, is then compressed to cylinder Shape prefabricated component.Then prefabricated component is squeezed out by cylinder, to provide the wet bands material of width 15.2cm and thickness 3.7mm.Wet bands material is rolled To 0.78mm thickness, dry 4 minutes in the forced air draft oven for being set as 150 DEG C, then 190 DEG C re-dry 4 minutes.Final Drying steps cause Expancel to expand.This become larger leads the xerantic band through rolling upper twin shaft is swollen simultaneously in two directions It is swollen.Heat insulator has the property that with a thickness of 3.37mm；Thermal conductivity under uncompressed is xx mW/mK, and MVTR (MDM) is 3271g/m²/ 24 hours.

Comparative example C

Make (the Dubonnet The Moore Co. purchased from Wilmington, DE of PTFE 601 in the following manner (E.I.DuPont de Nemours, Inc., Wilmington, DE)) and Expancel 951DU 120 expand hollow particle The dispersion of [Akzo Nobel N.V. (Akzo Nobel) of Amsterdam, the Netherlands] condenses altogether.By 308 restrain oneself alcohol be added Into 23.9 kilograms of water, mixed 1 minute with the impeller speed of 1500rpm.Speed slows down to 500rpm, is slowly added to 54 grams Expancel.Mixing continues to soak (about 6-10 minutes) completely to the hollow particle of expansion.Then 2.17 kilograms of PTFE is added Dispersion, mixer speed increase to 1500rpm, continue 1.5 minutes.The coagulation made is dehydrated by Reemay piece, so It is 24 hours dry at 125 DEG C in air oven afterwards.

Then obtained drying coagulation and ISOPAR K are blended with the ratio of 1.04kg/kg, is then compressed to cylinder Shape prefabricated component.Then prefabricated component is squeezed out by cylinder, to provide the wet bands material of width 15.2cm and thickness 3.7mm.Wet bands material is rolled To 0.78mm thickness, dry 4 minutes in the forced air draft oven for being set as 150 DEG C, then 190 DEG C re-dry 4 minutes.Final Drying steps cause expancel to expand.This become larger leads the xerantic band through rolling upper twin shaft is swollen simultaneously in two directions It is swollen.Obtained heat insulator has the property that with a thickness of 1.1mm；Thermal conductivity under uncompressed is xx mW/mK, MVTR It (MDM) is 1990g/m²/ 24 hours.

Come testing example 5,6,7 and Comparative examples A, B and C using above-mentioned flammable test.The result of the test is shown in table 1。

The embodiment of table 1 shows that disclosed heat insulator provides excellent thermal conductivity and excellent anti-flammability.

Above synoptically and in conjunction with specific embodiment describe disclosure of this application.Although this public affairs It opens and has elaborated to be considered preferred embodiment, but those skilled in the art can select in general disclosure A variety of alternatives.Other than described in appended claims, the disclosure is not limited by other.

Claims

1. a kind of heat insulator comprising polymer substrate, aerogel particle and varicosity microballoon；Wherein, aerogel particle Amount is 30 weight % or higher, and the amount of polymer substrate is greater than or equal to 20 weight %, and the amount of varicosity microballoon is 0.5 weight Measure % to 15 weight %, wherein weight percent is the total weight based on polymer substrate, aerogel particle and varicosity microballoon Meter；And in atmospheric conditions, the thermal conductivity of heat insulator is less than 40mW/m K.

2. heat insulator as described in claim 1, wherein polymer substrate is fluoropolymer, polytetrafluoroethylene (PTFE), varicosity Polytetrafluoroethylene (PTFE), varicosity ultra-high molecular weight polyethylene, polyolefin, varicosity polyolefin, gathers ultra-high molecular weight polyethylene (UHMWPE) Urethane or combinations thereof.

3. heat insulator as claimed in claim 1 or 2, wherein polymer substrate is expanded PTFE, and this is swollen Body polytetrafluoroethylene (PTFE) has the heat absorption at about 380 DEG C.

4. heat insulator as claimed in any one of claims 1-3, when according to being exposed to Vertical Flame 3 seconds to test, It shows without fusing, without dropping liquid and/or without burn-through.

5. such as heat insulator of any of claims 1-4, wherein the thermal conductivity of matrix is greater than in atmospheric conditions 27mW/m K and be less than 39mW/m K.

6. heat insulator according to any one of claims 1 to 5 is the form of sheet material or film, wherein matrix is It further include a layer or multiple layers on side, second side or the first side and second side the two.

7. heat insulator as claimed in claim 6, wherein one layer or multiple layers are polymeric layer, weaving layer, volume Tissue layer, non-woven layer or combinations thereof.

8. heat insulator as claimed in claims 6 or 7, wherein one layer or multiple layers be fluoropolymer, PTFE, polyolefin, varicosity fluoropolymer, varicosity PTFE, varicosity polyolefin, polyurethane or combinations thereof.

9. the heat insulator as described in any one of claim 6-8, wherein using adhesive continuously or discontinuously by institute It states a layer or multiple layers is adhered to varicosity polymer substrate, and described adhesive optionally includes fire proofing.

10. a kind of product, it includes heat insulators as claimed in any one of claims 1-9 wherein.

11. product as claimed in claim 10, wherein the product be gloves insulating cell, footwear insulating cell, clothes, Clothes liner, pipe-line wrapping material, low temperature insulation material, electronic device, cooker, household electrical appliance, storage container, food packaging, Key works Drug packing, immersion clothes, acoustic material, heat insulator or electrically insulating material.