Expanded polytetrafluoroethylene-based film type fog absorbent diaphragm

Abstract

The utility model discloses an expanded polytetrafluoroethylene-based film type fog-absorbing agent diaphragm, a support framework layer of the diaphragm is an expanded polytetrafluoroethylene film with a micropore structure, fog-absorbing agent slurry forms a fog-absorbing functional layer on the surface of the expanded polytetrafluoroethylene film, and the fog-absorbing agent slurry is embedded into the micropore structure to form active filling. Through the mode, the expanded polytetrafluoroethylene-based film type fog absorbent membrane prepared by adopting a high-precision surface controllable coating composite technology has the characteristics of high moisture absorption rate and lasting reversibility, the desorption reversible starting condition is not harsh, the desorption rate is high, and the adsorption and desorption cycle durability is excellent; the material has the advantages of excellent flexibility, excellent mechanical properties, excellent weather resistance and excellent temperature resistance, and is suitable for the narrow space field.

Description

TECHNICAL FIELD

[0001] The utility model relates to desiccant technical field especially relates to a kind of PTFE base film type fog-absorbing agent membrane sheet. BACKGROUND

[0002] At present, general traditional fog-absorbing agent is powder inorganic matter of micro-nano particle size, usually including zeolite, molecular sieve, calcium oxide, calcium chloride, magnesium oxide, magnesium chloride, sodium chloride, aluminum hydroxide and silicon dioxide, etc., in normal work, the moisture absorption mechanism of fog-absorbing agent includes chemical reaction adsorption and nano-porous physical adsorption, and is specifically divided into: zeolite, molecular sieve and mesoporous material are adsorbed by physical adsorption method;Base metal oxide and water are chemically adsorbed by reacting to form hydroxide;In addition, some salts with moisture absorption characteristics can also be used to absorb water.The powder inorganic fog-absorbing agent of micro-nano particle size has excellent specific surface area and thus excellent moisture absorption capacity, but in actual production and application cases, powder fog-absorbing agent will bring cumbersome operation and cleaning problems, and powder leakage and overflow will occur during the process of canning and use, affecting the appearance quality of product and the cleanliness level of service environment.In actual application, powder inorganic fog-absorbing agent must be packaged with appropriate container and soft packaging material before use, and it is difficult to use in some specific narrow space application fields due to the limited volume of the corresponding external packaging container.

[0003] In addition, most powder inorganic fog-absorbing agents are non-reversible and cannot be used repeatedly, and cannot be desorbed when reaching saturation equilibrium state, or the desorption conditions are harsh and cannot reach the reversible starting conditions, resulting in high humidity of service environment and affecting the service life of the whole device. UTILITY MODEL CONTENT

[0004] The utility model mainly solves the technical problem to provide a kind of PTFE base film type fog-absorbing agent membrane sheet, can realize that the moisture absorption capacity and desorption capacity have long-term effectiveness, reach multiple adsorption-desorption circulation uses, so that the humidity of service environment is effectively controlled for a long time.

[0005] To solve the above technical problems, one technical scheme of the utility model is to provide a kind of PTFE base film type fog-absorbing agent membrane sheet, comprising: support framework layer, functional layer and active filling, functional layer is composite at least one side surface of support framework layer, and active filling is embedded in support framework layer;The support framework layer is the PTFE film with microporous structure, and the fog-absorbing agent slurry forms the fog-absorbing functional layer on the surface of the PTFE film, and the fog-absorbing agent slurry is embedded in the microporous structure to form active filling.

[0006] In a preferred embodiment of the present application, the expanded polytetrafluoroethylene film is a single-drawn film or a double-drawn film with a thickness of 5-300 microns, and a pore size range of 0.1-30 microns.

[0007] In a preferred embodiment of the present application, the film thickness is 50-300 microns, and the gram weight per unit area is ≤200 g / m 2 .

[0008] The present application has the following advantages: the high-precision surface controllable coating composite technology is used to prepare the expanded polytetrafluoroethylene-based film type mist adsorber film with high moisture absorption rate and long-lasting reversible characteristics, the moisture absorption rate of the film can reach more than 140% of its own weight under the condition of 40 DEG C and 90% RH, and the film has excellent high moisture absorption rate; under the moisture saturated state, the film can be placed in a 35 DEG C environment to realize desorption, the desorption rate is more than 130%, the reversible starting condition of the film desorption is not harsh, the desorption rate is high, and the film has excellent adsorption and desorption cycle durability; the film has excellent flexibility and mechanical properties, the tensile strength is greater than or equal to 3 MPa, and the elongation at break is greater than or equal to 45%; the film has excellent weather resistance and temperature resistance, and the use temperature is-60 DEG C to 120 DEG C; in addition, the film has the advantages of thin thickness, small size and light gram weight per unit area, and is suitable for moisture-proof and mist-proof treatment in narrow space fields such as electronic equipment and precision instruments, and the application scenarios and application range of the film are expanded. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor, wherein:

[0010] Figure 1 is a structural schematic view of a preferred embodiment of the expanded polytetrafluoroethylene-based film type mist adsorber film of the present application. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application, and obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0012] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the utility model protection.

[0013] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0014] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "front", "back" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0015] In the description of the utility model, it should also be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0016] In the utility model, unless otherwise explicitly specified and limited, the first feature above or below the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0017] Please refer to Figure 1 The utility model embodiment includes: Embodiment 1

[0018] The utility model provides an ePTFE based mist adsorber membrane, which comprises a support skeleton layer 2, a functional layer 1 and an active filling, the functional layer 1 is compounded on at least one side surface of the support skeleton layer 2, and the active filling is embedded in the support skeleton layer 2.

[0019] In the utility model, the support skeleton layer 2 is an ePTFE film with a microporous structure, the mist adsorber slurry forms the functional layer 1 with the mist adsorption function on the upper and lower surfaces of the ePTFE film, and the mist adsorber slurry is embedded in the microporous structure to form the active filling.

[0020] The ePTFE film is a single-drawn film or a double-drawn film with a thickness of 5-300 microns. The ePTFE film has a pore size range of 0.1-30 microns. There are hundreds of millions of irregularly shaped and staggered three-dimensional micropores per square centimeter, which have a certain air permeability and moisture permeability.

[0021] The membrane has a thickness of 50-300 microns and a unit area gram weight of less than or equal to 200 g / m 2 . The ePTFE based mist adsorber membrane has excellent flexibility and mechanical properties, a tensile strength of greater than or equal to 3 MPa, and an elongation at break of greater than or equal to 45%. The ePTFE based mist adsorber membrane has excellent weather resistance and temperature resistance, and can be used at a temperature of-60-120 DEG C. Due to the advantages of thin thickness, small size and light unit area gram weight, the ePTFE based mist adsorber membrane is suitable for the moisture-proof and mist-proof treatment of electronic devices and precision instruments in narrow spaces, thereby expanding the application scenarios and application range.

[0022] The preparation method of the ePTFE based mist adsorber membrane comprises the following steps:

[0023] 150 parts of a solvent, 10 parts of a coupling agent and 140 parts of mist adsorber powder are added to 100 parts of an organic binder resin according to the mass fraction, mixed and uniformly dispersed to obtain a mist adsorber slurry, and the mist adsorber slurry is further ground, ground twice, and each grinding time is 10 minutes, so that the mist adsorber slurry is prepared, and the viscosity is 1300 mPa·s. The above-mentioned mist adsorber slurry is coated into the ePTFE film by using a high-precision surface controllable coating composite technology, dried and cured into a film at a high temperature of 120 DEG C, and then the film is cut and precisely die-cut to obtain the ePTFE based mist adsorber membrane, which has a thickness of 160 microns and a unit area gram weight of 150 g / m 2 . Example 2

[0024] The utility model provides an ePTFE base film type mist adsorbing agent membrane piece, comprising: a supporting framework layer 2, a functional layer 1 and active filling, the functional layer 1 is compounded on at least one side surface of the supporting framework layer 2, the utility model preferably has the functional layer 1 on the upper and lower of the supporting framework layer 2, and the active filling is embedded in the supporting framework layer 2.

[0025] In the utility model, the supporting framework layer 2 is an ePTFE film with microporous structure, the mist adsorbing agent slurry forms the functional layer 1 with the function of adsorbing mist on the upper and lower surfaces of the ePTFE film, and the mist adsorbing agent slurry is embedded in the microporous structure to form the active filling.

[0026] The ePTFE film is a single-drawn film or a double-drawn film with a thickness of 5-300 microns. The ePTFE film has a pore size range of 0.1-30 microns. There are hundreds of millions of irregularly shaped and staggered three-dimensional microporous air gaps per square centimeter, and the material has a large number of interconnected pores with certain air permeability and moisture permeability.

[0027] The membrane piece has a thickness of 50-300 microns and a unit area gram weight of less than or equal to 200 g / m 2 . The ePTFE base film type mist adsorbing agent membrane piece has excellent flexibility and mechanical properties, a tensile strength of greater than or equal to 3 MPa, and an elongation at break of greater than or equal to 45%. The ePTFE base film type mist adsorbing agent membrane piece has excellent weather resistance and temperature resistance, and can be used at a temperature of-60°C to 120°C. Due to the advantages of thin thickness, small size and light unit area gram weight, the ePTFE base film type mist adsorbing agent membrane piece is suitable for use in narrow spaces, such as the prevention of moisture and mist in electronic devices and precision instruments, thereby expanding the application scenarios and application range.

[0028] The utility model discloses a preparation method of the ePTFE base film type mist adsorbing agent membrane piece, which comprises the following steps:

[0029] The 150 parts of solvent, 10 parts of coupling agent and 140 parts of mist adsorbing agent powder are added to 100 parts of organic binder resin according to the mass fraction, mixed and uniformly dispersed to obtain the mist adsorbing agent slurry, and the mist adsorbing agent slurry is further ground. The grinding time is 10 minutes each time, and the mist adsorbing agent slurry is prepared. The viscosity is 1150 mPa·s. The above-mentioned mist adsorbing agent slurry is coated into the ePTFE film by using high-precision surface controllable coating composite technology, dried and cured into a film at a high temperature of 120 DEG C, and then the film is cut and precisely die-cut to obtain the ePTFE base film type mist adsorbing agent membrane piece, which has a thickness of 140 microns and a unit area gram weight of 135 g / m 2 . Example 3

[0030] The utility model provides an ePTFE based mist adsorber membrane, which comprises a support skeleton layer 2, a functional layer 1 and an active filling, the functional layer 1 is compounded on at least one side surface of the support skeleton layer 2, and the active filling is embedded in the support skeleton layer 2.

[0031] In the utility model, the support skeleton layer 2 is an ePTFE film with a microporous structure, the mist adsorber slurry forms the functional layer 1 with the mist adsorption function on the upper and lower surfaces of the ePTFE film, and the mist adsorber slurry is embedded in the microporous structure to form the active filling.

[0032] The ePTFE film is a single-drawn film or a double-drawn film with a thickness of 5-300 microns. The ePTFE film has a pore size range of 0.1-30 microns. There are hundreds of millions of irregularly shaped and staggered three-dimensional micropores per square centimeter, which have a certain air permeability and moisture permeability.

[0033] The membrane has a thickness of 50-300 microns and a unit area gram weight of less than or equal to 200 g / m 2 . The ePTFE based mist adsorber membrane has excellent flexibility and mechanical properties, a tensile strength of greater than or equal to 3 MPa, and an elongation at break of greater than or equal to 45%. The ePTFE based mist adsorber membrane has excellent weather resistance and temperature resistance, and can be used at a temperature of-60-120 DEG C. Due to the advantages of thin thickness, small size and light unit area gram weight, the ePTFE based mist adsorber membrane is suitable for the moisture-proof and mist-proof treatment of electronic devices and precision instruments in narrow spaces, thereby expanding the application scenarios and application range.

[0034] The preparation method of the ePTFE based mist adsorber membrane comprises the following steps:

[0035] 110 parts of a solvent, 15 parts of a coupling agent and 150 parts of mist adsorber powder are added to 100 parts of an organic binder resin according to the mass fraction, mixed and uniformly dispersed to obtain a mist adsorber slurry, and the mist adsorber slurry is further ground, ground twice, and each grinding time is 10 minutes, so that the mist adsorber slurry is prepared, and the viscosity is measured to be 1430 mPa·s. The above-mentioned mist adsorber slurry is coated into the ePTFE film by using a high-precision surface controllable coating composite technology, dried and cured into a film at a high temperature of 120 DEG C, and then the film is cut and precisely die-cut to obtain the ePTFE based mist adsorber membrane, which has a thickness of 255 microns and a unit area gram weight of 192 g / m 2 . Example 4

[0036] The utility model provides an expanded polytetrafluoroethylene based film type mist adsorber membrane piece, comprising: a support skeleton layer 2, a functional layer 1 and active filling, the functional layer 1 is compounded on at least one side surface of the support skeleton layer 2, the utility model preferably has the functional layer 1 on the upper and lower of the support skeleton layer 2, and the active filling is embedded in the support skeleton layer 2.

[0037] In the utility model, the support skeleton layer 2 is an expanded polytetrafluoroethylene film with a microporous structure, and the mist adsorber slurry forms the functional layer 1 for adsorbing mist on the upper and lower surfaces of the expanded polytetrafluoroethylene film, and the active filling is embedded in the microporous structure.

[0038] The expanded polytetrafluoroethylene film is a single-drawn film or a double-drawn film with a thickness of 5-300 microns. The expanded polytetrafluoroethylene film has a pore size range of 0.1-30 microns. There are hundreds of millions of irregularly shaped and staggered three-dimensional micropores per square centimeter, which have a certain air permeability and moisture permeability.

[0039] The membrane piece has a thickness of 50-300 microns and a unit area gram weight of less than or equal to 200 g / m 2 . The membrane piece has excellent flexibility and mechanical properties, a tensile strength of greater than or equal to 3 MPa, and an elongation at break of greater than or equal to 45%. The membrane piece has excellent weather resistance and temperature resistance, and can be used at a temperature of-60-120 DEG C. Due to the advantages of thin thickness, small size and light unit area gram weight, the membrane piece is suitable for use in narrow spaces, such as the moisture-proof and mist-proof treatment of electronic devices and precision instruments, thereby expanding the application scenarios and application range of the membrane piece.

[0040] The utility model discloses a preparation method of the expanded polytetrafluoroethylene based film type mist adsorber membrane piece, which comprises the following steps:

[0041] 110 parts of a solvent, 15 parts of a coupling agent and 150 parts of mist adsorber powder are added to 100 parts of an organic binder resin according to the mass fraction, and then mixed and dispersed uniformly to obtain a mist adsorber slurry. The mist adsorber slurry is further ground, and the grinding is performed 4 times, with a grinding time of 10 minutes each time. The viscosity of the prepared mist adsorber slurry is 1380 mPa·s. The above-mentioned mist adsorber slurry is coated into the expanded polytetrafluoroethylene film by using a high-precision surface controllable coating composite technology, and then dried and cured into a film at a high temperature of 120 DEG C. Then, the film is cut and precisely die-cut to obtain the expanded polytetrafluoroethylene based film type mist adsorber membrane piece, which has a thickness of 225 microns and a unit area gram weight of 180 g / m 2 . Example 5

[0042] An expanded polytetrafluoroethylene film-type defogging agent film includes: a supporting skeleton layer 2, a functional layer 1, and an active filler. The functional layer 1 is composited on at least one side surface of the supporting skeleton layer 2. Preferably, the supporting skeleton layer 2 is composited with the functional layer 1 on both the top and bottom, and the active filler is embedded in the supporting skeleton layer 2.

[0043] In this invention, the supporting skeleton layer 2 is an expanded polytetrafluoroethylene membrane with a microporous structure. The mist absorber slurry forms a mist-absorbing functional layer 1 on both the upper and lower surfaces of the expanded polytetrafluoroethylene membrane, and the mist absorber slurry is embedded in the microporous structure to form an active filler.

[0044] The expanded polytetrafluoroethylene (ePTFE) membrane is a single-stretched or double-stretched membrane with a thickness of 5 to 300 μm. The pore size of the ePTFE membrane ranges from 0.1 to 30 μm. There are hundreds of millions of irregularly shaped, staggered, three-dimensional micropores per square centimeter, and the material has a large number of interconnected micropores, which provide a certain degree of air permeability and moisture permeability.

[0045] The membrane thickness is 50 ~ 300 μm, and the basis weight per unit area is ≤200 g / m². 2 It possesses excellent flexibility and mechanical properties, with a tensile strength ≥3 MPa and an elongation at break ≥45%; it also exhibits excellent weather resistance and temperature resistance, with an operating temperature range of -60℃ to 120℃; due to its thinness, small size, and light weight per unit area, it is suitable for use in confined spaces, such as for moisture-proofing and anti-fog treatment of electronic equipment and precision instruments, thus expanding its application scenarios and scope of application.

[0046] The preparation method of the expanded polytetrafluoroethylene film-type defogging agent of this utility model includes the following steps:

[0047] 190 parts by weight of solvent, 10 parts by weight of coupling agent, and 130 parts by weight of defogging agent powder were added to 100 parts by weight of organic binder resin and mixed and dispersed evenly to obtain a defogging agent slurry. The defogging agent slurry was then further ground four times, with each grinding time being 10 minutes, to prepare a defogging agent slurry with a measured viscosity of 900 mPa·s. The above defogging agent slurry was coated onto an expanded polytetrafluoroethylene (ePTFE) film using a high-precision surface controllable coating composite technology. After high-temperature drying and curing at 120°C, the film was then slit and precision die-cut to obtain an ePTFE film-type defogging agent film with a thickness of 110 μm and a basis weight of 100 g / m². 2 .

[0048] In the above embodiment 1-5, the coupling agent is one or more of γ-glycidoxypropyltrimethoxysilane, γ-(methacryloyloxy)propyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, vinyltriethoxysilane, anilinomethyltriethoxysilane, titanate coupling agent, zirconate coupling agent, phosphorus-containing coupling agent, and boron-containing coupling agent, and the like, and further preferably γ-(methacryloyloxy)propyltrimethoxysilane.

[0049] The active mist adsorbent powder includes one or more of zeolite, molecular sieve, calcium oxide, calcium chloride, magnesium oxide, magnesium chloride, sodium chloride, aluminum hydroxide, and silicon dioxide, and the like, and preferably magnesium oxide and magnesium chloride, and the addition mass ratio is 25 wt% to 70 wt%.

[0050] The organic binder resin includes one or more of polyacrylate resin, polyurethane resin, epoxy resin, silicone-modified acrylic resin, and mercapto-silicone oligomer resin.

[0051] The expanded polytetrafluoroethylene-based thin film type mist adsorbent film prepared by the above preparation method, instead of the conventional mist adsorbent powder, overcomes the problems of filling difficulty, powder overflow, and powder leakage of the conventional powder mist adsorbent, and can be applied in high-cleanliness fields.

[0052] The expanded polytetrafluoroethylene-based thin film type mist adsorbent film prepared in the above embodiment 1-5 is subjected to performance testing, and the details are shown in Table 1.

[0053] Table 1 Performance of expanded polytetrafluoroethylene-based thin film type mist adsorbent film

[0054] Sample Grinding times (times) Viscosity (mPa-s) Thickness (μm) Grammage (g / m 2 ) per area Moisture absorption rate (%) Desorption rate (%) Example 1 2 1300 160 150 157.0 149.5 Example 2 4 1150 140 135 152.5 141.0 Example 3 2 1430 255 192 170.5 163.5 Example 4 4 1380 225 180 165.8 153.5 Example 5 4 900 110 100 142.0 135.8

[0055] As can be seen, the expanded polytetrafluoroethylene-based thin film type mist adsorbent film prepared by the high-precision surface controllable coating composite technology has high moisture absorption rate and durable reversibility, and under the condition of 40℃ and 90% RH, the moisture absorption rate of the film can reach more than 140% of its own weight, and has excellent high moisture absorption rate; under the saturated moisture absorption state, the film can be placed in a 35℃ environment to achieve desorption, and the desorption rate is more than 130%, realizing the non-stringent desorption reversibility starting condition of the film, high desorption rate, and excellent adsorption and desorption cycle durability, so that the humidity of the service environment can be effectively controlled for a long time.

[0056] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process conversion made by using the content of the present application specification, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. An intumescent polytetrafluoroethylene-based film-type mist eliminator sheet, characterized by, Comprise: Support skeleton layer, functional layer and active filling, the functional layer is compounded in at least one side surface of support skeleton layer, and the active filling is embedded in support skeleton layer; The support skeleton layer is the expanded polytetrafluoroethylene film with micro-porous structure, the mist absorption agent slurry forms the mist absorption functional layer on at least one side surface of the expanded polytetrafluoroethylene film, and the mist absorption agent slurry is embedded in the micro-porous structure to form the active filling.

2. The bulked polytetrafluoroethylene-based film mask for a mist eliminator according to claim 1, wherein The expanded polytetrafluoroethylene film is single-drawing film or double-drawing film with thickness of 5-300 μm, and the pore size range is 0.1-30 μm.

3. The bulked polytetrafluoroethylene-based, film-type, mist-adsorbing membrane according to claim 1, wherein The film thickness is 50-300 μm, and the gram weight per unit area is ≤200 g / m 2 .

4. The bulked polytetrafluoroethylene-based, film-type, mist-adsorbing membrane according to claim 1, wherein Both upper and lower side surfaces of the expanded polytetrafluoroethylene film are provided with the mist absorption functional layer.

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