CN112318976A - High-weather-resistance TPU composite material - Google Patents

High-weather-resistance TPU composite material Download PDF

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Publication number
CN112318976A
CN112318976A CN202011197884.6A CN202011197884A CN112318976A CN 112318976 A CN112318976 A CN 112318976A CN 202011197884 A CN202011197884 A CN 202011197884A CN 112318976 A CN112318976 A CN 112318976A
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China
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tpu
parts
layer
coating
components
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张积财
李鹏
胡国银
张涛
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Cta Hi Tech Textiles Co ltd
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Cta Hi Tech Textiles Co ltd
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Priority to CN202011197884.6A priority Critical patent/CN112318976A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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    • C08J5/18—Manufacture of films or sheets
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
    • D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
    • D06N3/0034—Polyamide fibres
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
    • D06N3/147—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes characterised by the isocyanates used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/71—Resistive to light or to UV
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/10—Properties of the materials having mechanical properties
    • D06N2209/103—Resistant to mechanical forces, e.g. shock, impact, puncture, flexion, shear, compression, tear
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/14—Properties of the materials having chemical properties
    • D06N2209/143—Inert, i.e. inert to chemical degradation, corrosion resistant
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    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/16—Properties of the materials having other properties
    • D06N2209/1628—Dimensional stability
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    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
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    • D06N2209/16—Properties of the materials having other properties
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    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/16—Properties of the materials having other properties
    • D06N2209/1685—Wear resistance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
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  • Laminated Bodies (AREA)

Abstract

The invention provides a high weather-resistant TPU composite material which comprises a PU coating, a framework material layer, an adhesive layer, a TPU layer and a surface treatment layer which are sequentially bonded and superposed. According to the high-weather-resistance TPU composite material, the TPU film is protected by performing the functional coating on the surface of the TPU film, so that the weather resistance is improved, and the durability of the material is improved. After the functionalization treatment, the TPU film surface is irradiated in an ultraviolet aging box for 200 hours, no visible yellowing phenomenon occurs, no cracks occur on the surface, and meanwhile, the breaking strength retention rate of the TPU film is over 90 percent; the preparation process technology has the characteristics of high production efficiency, energy conservation, environmental protection and flexible process technology, and the adopted polyurethane sizing material can be added with or without auxiliary agents such as an anti-sticking agent, a lubricating agent and the like, so that the influence of the auxiliary agents on the sizing material performance is avoided. Meanwhile, the textile framework material is low in heating temperature and short in time, so that the strength damage to the framework material is small. The processing precision is high, and the deviation of film thickness control can be controlled within 0.02 mm.

Description

High-weather-resistance TPU composite material
Technical Field
The invention belongs to the technical field of fabric manufacturing, and particularly relates to a high-weather-resistance TPU composite material.
Background
The thermoplastic polyurethane elastomer (TPU) is a branch of a thermoplastic elastomer material and is a high molecular material polymerized by three basic raw materials of diisocyanate, macromolecular polyol and a chain extender (low molecular diol). Compared with the general plastic and rubber materials, the TPU has the advantages of wide hardness range, outstanding mechanical properties, excellent high/low temperature resistance, good processing performance, strong plasticity, strong designability, excellent environmental protection performance, excellent transparency and the like, and has the high elasticity of the rubber materials and the high strength of the engineering plastics.
The TPU has wide application space, wherein the TPU film is compounded on various fabrics to form a composite material, and the characteristics of the TPU film and the fabrics are combined to obtain a novel fabric. The composite fabric has the performance advantages of high air tightness, high tensile strength, softness, light weight, wear resistance, low-temperature folding resistance, high-frequency welding (high forming and processing efficiency), safety, environmental protection and the like, and is an ideal substitute material for rubber coated fabrics and PVC coated fabrics. The main advantages are as follows: 1. excellent performance, high tensile strength, good wear resistance, good low-temperature folding resistance, light weight and the like. 2. The material and the production process have the characteristics of safety, environmental protection, energy conservation and high efficiency, and the TPU material can reach the FDA certification standard. 3. Compared with the forming process of the rubber coated fabric, the forming process of the rubber coated fabric has the characteristics of high efficiency, energy conservation and environmental protection, the forming of the rubber coated fabric needs a vulcanization process or adhesive bonding, the defects of low efficiency and environmental pollution exist, and the TPU coated fabric can be formed by adopting a high-efficiency high-frequency welding process. The TPU composite fabric can be applied to the manufacture of inflatable life jackets, single-soldier inflatable mattresses, battle and emergency application water storage and transportation bags, soft oil storage and transportation containers and the like.
At present, the main modes of the material comprise a casting mode and a calendaring mode. The casting coating is a process technology that polyurethane rubber is evenly plasticized through a screw extruder, then a film is cast through a flat die head with accurately controlled thickness, and then the molten polyurethane film and the pretreated textile framework material are laminated and compounded to obtain the polyurethane coated fabric. However, the common problem of the TPU composite fabric in the practical application process is that the TPU has poor yellowing resistance, the main reason is that the TPU commonly used in the market at present is an aromatic TPU material, and because the molecular structure of the TPU has a benzene ring, the large pi bond of the benzene ring and the isocyanate group form a conjugated structure, the isocyanate group is decomposed under the action of sunlight ultraviolet rays for a long time to generate an aniline structure, the aniline is rearranged to form other chromogenic groups to turn yellow, and simultaneously the film surface of the TPU is cracked and falls off, and the appearance and the durability of the material are seriously affected.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and provide a highly weather-resistant TPU composite material with stronger durability, so as to solve the problems that the practicality and durability of the product are seriously affected by surface yellowing, cracking, shedding, pulverization, etc. caused by oxidation, ultraviolet aging, etc. on the surface of the TPU material in the long-term use process, and avoid the material aging problem caused by sunlight irradiation by innovatively introducing a surface functional treatment layer.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a high weather-resistant TPU composite material comprises a PU coating, a framework material layer, an adhesive layer, a TPU layer and a surface treatment layer which are sequentially bonded and superposed.
Further, the PU coating comprises the following raw material formula in parts by weight: 100 parts of yellowing-resistant PU glue, 3-5 parts of polyisocyanate bridging agent, 0.1-0.3 part of anti-ultraviolet agent, 0.2-0.4 part of anti-UV agent and 20-40 parts of solvent.
Further, the framework material layer is a 210D and 132T nylon fabric, the breaking strength of the nylon fabric is more than or equal to 600N, and the tearing strength of the nylon fabric is more than or equal to 20N.
The nylon oxford fabric is light in weight, wear-resistant, high in strength, high in chemical resistance and deformation resistance, and excellent in durability. Nylon belongs to light fabric, and the product dead weight that makes can be lighter than that made of other surface fabrics, and nylon surface fabric's elasticity and elasticity recovery are fabulous simultaneously.
The potential main application of the material is used for life-saving appliances, so the material takes 210D and 132T nylon fabrics which can meet CE certification conditions as framework materials to meet the use strength.
Further, the adhesive layer comprises the following raw material formula in parts by weight: 100 parts of hydrolysis-resistant PU glue, 5-10 parts of polyisocyanate bridging agent, 0.5-1 part of hydrolysis-resistant auxiliary agent and 20-40 parts of solvent.
Considering that the main application areas of the material are high ultraviolet irradiation and high temperature and high humidity environment, the bonding layer is made of high hydrolysis resistance resin, and excellent peeling strength is required.
Further, the TPU layer comprises the following raw material formula in parts by weight: 100 parts of TPU, 2-4 parts of hydrolysis-resistant master batch, 1-3 parts of antioxidant master batch and 1-3 parts of ultraviolet-resistant master batch.
The TPU layer is taken as an important airtight functional layer, the practical performance of the final material is directly influenced by the importance of the TPU layer, and a 0.12mm hydrolysis-resistant TPU film is adopted as the TPU film.
Further, the surface treatment layer comprises the following raw material formula in parts by weight: 100 parts of PU glue, 1-3 parts of isocyanate bridging agent, 20-30 parts of rutile crystal titanium dioxide, 3-5 parts of coupling agent and 10-20 parts of solvent; the PU adhesive does not contain benzene rings.
In order to improve the weather resistance of the surface of the TPU composite material, the surface of the TPU is subjected to functional treatment, the TPU layer is treated, the weldable performance and yellowing resistance of the TPU surface are required to be kept, the PU glue without benzene ring structures is adopted as the surface treatment layer, rutile crystal type titanium dioxide is required to be added into the glue, and in order to ensure the dispersion uniformity of the titanium dioxide, a coupling agent is required to be added for pretreating the titanium dioxide, so that the compatibility of the titanium dioxide and the glue is improved.
A method for preparing a high weather-resistant TPU composite material is characterized by comprising the following steps: the method comprises the following steps:
firstly, preparing a PU coating: weighing the components according to the specified requirements according to the formula, mixing the components by using a high-speed mixer for stirring for no more than 20min, placing the slurry after preparation for 30min for defoaming, feeding the slurry by using a coating machine, controlling the amount of the coated slurry to be 5-10 g, and drying the coated slurry in an oven at 120-140 ℃ for 2-3 min;
secondly, gluing of an adhesive: the components are weighed according to the specified requirements according to the formula, then mixed by a high-speed mixer, the mixing time is not more than 20min, the slurry is placed for at least 30min after being prepared, defoamed and used, and the feeding is also carried out by a coating machine. In order to ensure the peeling strength, the gluing amount is controlled to be 10-15g, and the coating enters an oven to be dried at the temperature of 140-160 ℃, wherein the drying time is 3-5 min.
Thirdly, compounding TPU layers: weighing the components according to the formula requirement, mixing the components through a high-speed mixer, drying the mixed components at the temperature of 70-90 ℃ for 2-4 h, compounding the dried materials through casting extrusion equipment, and laminating the materials at the extrusion temperature of 180-200 ℃ and the rolling pressure of 0.4-0.6 Mpa.
Fourthly, preparing a surface treatment layer: weighing the components according to a formula, stirring the components by a high-speed stirrer for 30min, placing the prepared slurry for at least 40min for defoaming to avoid pinholes in the coating process, gluing the TPU film surface by a coating machine, controlling the gluing amount to be 20-40 g to ensure the weather resistance, drying the coated TPU film surface in an oven at the drying temperature of 100-120 ℃ for 4-6 min to ensure the weather resistance.
The principle is as follows: the TPU is used as an airtight functional layer to be compounded with nylon oxford with excellent hydrolysis resistance and salt content, and meanwhile, in order to avoid the defect that the traditional TPU material is not yellowing-resistant, the surface of the TPU is subjected to functional treatment, the TPU material is protected, and yellowing and performance aging of the TPU under direct ultraviolet radiation in the using process are avoided. At present, common composite functional materials on the market have poor hydrolysis resistance, are easy to separate framework materials from membranes in a high-humidity environment, and have poor durability. Meanwhile, in order to improve the hydrolysis resistance between the TPU film and the framework material, the durability of the composite material in a high-humidity environment is improved by adding a hydrolysis resistant agent to the bonding layer.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the high-weather-resistance TPU composite material, the TPU film is protected by performing the functional coating on the surface of the TPU film, so that the weather resistance is improved, and the durability of the material is improved. After the functionalization treatment, the TPU film surface is irradiated in an ultraviolet aging box for 200 hours, no visible yellowing phenomenon occurs, no cracks occur on the surface, meanwhile, the breaking strength retention rate of the TPU film is over 90 percent, the unprotected TPU film material has obvious yellowing phenomenon, slight cracks occur on the surface, and the breaking strength loss of the film is over 50 percent.
(2) The preparation process technology of the high weather-resistant TPU composite material has the characteristics of high production efficiency, energy conservation, environmental protection and flexible process technology, overcomes the limitation that the calendering and coating process has strict requirements on the viscosity of the polyurethane adhesive, and can avoid the influence of the auxiliary agent on the performance of the adhesive by adding less or no auxiliary agents such as anti-sticking agents, lubricants and the like to the adopted polyurethane adhesive. Meanwhile, the textile framework material is low in heating temperature and short in time, so that the strength damage to the framework material is small. The processing precision is high, and the deviation of film thickness control can be controlled within 0.02 mm.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic overall cross-sectional view of a highly weatherable TPU composite of the present invention.
Description of reference numerals:
1-PU coating; 2-a skeleton material layer; 3-an adhesive layer; 4-a TPU layer; 5-surface treatment layer.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1: preparing a composite material:
firstly, preparing a PU coating: weighing the components according to the specified requirements according to the formula, mixing the components by using a high-speed mixer for stirring for no more than 20min, placing the slurry after preparation for 30min for defoaming, feeding the slurry by using a coating machine, controlling the amount of the coated slurry to be 5-10 g, and drying the coated slurry in an oven at 120-140 ℃ for 2-3 min;
secondly, gluing of an adhesive: the components are weighed according to the specified requirements according to the formula, then mixed by a high-speed mixer, the mixing time is not more than 20min, the slurry is placed for at least 30min after being prepared, defoamed and used, and the feeding is also carried out by a coating machine. In order to ensure the peeling strength, the gluing amount is controlled to be 10-15g, and the coating enters an oven to be dried at the temperature of 140-160 ℃, wherein the drying time is 3-5 min.
Thirdly, compounding TPU layers: weighing the components according to the formula requirement, mixing the components through a high-speed mixer, drying the mixed components at the temperature of 70-90 ℃ for 2-4 h, compounding the dried materials through casting extrusion equipment, and laminating the materials at the extrusion temperature of 180-200 ℃ and the rolling pressure of 0.4-0.6 Mpa.
Fourthly, preparing a surface treatment layer: weighing the components according to a formula, stirring the components by a high-speed stirrer for 30min, placing the prepared slurry for at least 40min for defoaming to avoid pinholes in the coating process, gluing the TPU film surface by a coating machine, controlling the gluing amount to be 20-40 g to ensure the weather resistance, drying the coated TPU film surface in an oven at the drying temperature of 100-120 ℃ for 4-6 min to ensure the weather resistance.
Example 2:
firstly, preparing a PU coating: the same preparation method as in example 1;
secondly, gluing of an adhesive: the same preparation method as in example 1;
thirdly, compounding TPU layers: weighing the components according to the formula requirement, mixing the components through a high-speed mixer, drying the mixture at the temperature of 70-90 ℃ for 2-4 h, compounding the dried material through calendering and extruding equipment, and laminating the dried material at the extrusion temperature of 180-200 ℃ and the rolling pressure of 0.4-0.6 Mpa.
Fourthly, the method comprises the following steps: preparation of surface treatment layer: the same procedure was followed as in example 1. Comparative material 1 was finally obtained.
Example 3: comparative material 2 was prepared according to the preparation method of steps one to three in example 1.
Example 4: the composite and comparative material 1 were subjected to strength testing:
table 1 strength test results
Figure BDA0002754524300000051
As can be seen from Table 1: by the tape casting and laminating method, the binding force between the film and the framework material is good, and the strength loss is less.
Example 5: aging test:
1. the composites prepared in examples 1 and 3 and comparative material 2 were exposed to light in a UV-curing oven for 200 h.
And (4) experimental conclusion: the composite material prepared in example 1 has no visible yellowing phenomenon and no cracks on the surface, and the composite material prepared in example 2 has obvious yellowing on the surface and cracks on the surface.
TABLE 2 results of aging test
Comparative Material 2 Raw film After 200h of accelerated aging Strength retention ratio
Breaking strength (Mpa) 36.6 15.6 42.6％
Composite material Raw film Aging is accelerated for 200h
Breaking strength (Mpa) 34.5 31.5 90.4％
As can be seen from Table 2, the weatherability of the TPU composite material is significantly improved by the functionalized coating of the TPU surface.
Example 6: composite Performance testing
Table 3 composite property data
Figure BDA0002754524300000061
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. The high-weather-resistance TPU composite material is characterized by comprising a PU coating (1), a framework material layer (2), an adhesive layer (3), a TPU layer (4) and a surface treatment layer (5) which are sequentially bonded and superposed.
2. The highly weatherable TPU composite of claim 1, wherein: the PU coating (1) comprises the following raw material formula in parts by weight: 100 parts of yellowing-resistant PU glue, 3-5 parts of polyisocyanate bridging agent, 0.1-0.3 part of anti-ultraviolet agent, 0.2-0.4 part of anti-UV agent and 20-40 parts of solvent.
3. The highly weatherable TPU composite of claim 1, wherein: the framework material layer (2) is made of 210D and 132T nylon fabric, the breaking strength of the nylon fabric is more than or equal to 600N, and the tearing strength of the nylon fabric is more than or equal to 20N.
4. The highly weatherable TPU composite of claim 1, wherein: the adhesive layer comprises the following raw material formula in parts by weight: 100 parts of hydrolysis-resistant PU glue, 5-10 parts of polyisocyanate bridging agent, 0.5-1 part of hydrolysis-resistant auxiliary agent and 20-40 parts of solvent.
5. The highly weatherable TPU composite of claim 1, wherein: the TPU layer (4) comprises the following raw material formula in parts by weight: 100 parts of TPU, 2-4 parts of hydrolysis-resistant master batch, 1-3 parts of antioxidant master batch and 1-3 parts of ultraviolet-resistant master batch.
6. The highly weatherable TPU composite of claim 1, wherein: the surface treatment layer (5) comprises the following raw material formula in parts by weight: 100 parts of PU glue, 1-3 parts of isocyanate bridging agent, 20-30 parts of rutile crystal titanium dioxide, 3-5 parts of coupling agent and 10-20 parts of solvent; the PU adhesive does not contain benzene rings.
7. A process for preparing the highly weatherable TPU composite of any of claims 1 to 6, characterized in that: the method comprises the following steps:
firstly, preparing a PU coating (1): weighing the components according to the specified requirements according to the formula, mixing the components by using a high-speed mixer for stirring for no more than 20min, placing the slurry after preparation for 30min for defoaming, feeding the slurry by using a coating machine, controlling the amount of the coated slurry to be 5-10 g, and drying the coated slurry in an oven at 120-140 ℃ for 2-3 min;
secondly, gluing of an adhesive: the components are weighed according to the specified requirements according to the formula, then mixed by a high-speed mixer, the mixing time is not more than 20min, the slurry is placed for at least 30min after being prepared, defoamed and used, and the feeding is also carried out by a coating machine. In order to ensure the peeling strength, the gluing amount is controlled to be 10-15g, and the coating enters an oven to be dried at the temperature of 140-160 ℃, wherein the drying time is 3-5 min.
Thirdly, compounding the TPU layer (4): weighing the components according to the formula requirement, mixing the components through a high-speed mixer, drying the mixed components at the temperature of 70-90 ℃ for 2-4 h, compounding the dried materials through casting extrusion equipment, and laminating the materials at the extrusion temperature of 180-200 ℃ and the rolling pressure of 0.4-0.6 Mpa.
Fourthly, preparing a surface treatment layer (5): weighing the components according to a formula, stirring the components by a high-speed stirrer for 30min, placing the prepared slurry for at least 40min for defoaming to avoid pinholes in the coating process, gluing the TPU film surface by a coating machine, controlling the gluing amount to be 20-40 g to ensure the weather resistance, drying the coated TPU film surface in an oven at the drying temperature of 100-120 ℃ for 4-6 min to ensure the weather resistance.
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CN115710343A (en) * 2022-10-31 2023-02-24 浙江明士达股份有限公司 Folding-resistant anti-corrosion soft water bag material and preparation method thereof
CN115807345A (en) * 2022-10-31 2023-03-17 中纺新材料科技有限公司 Multifunctional elastomer composite material and preparation method and application thereof
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Publication number Priority date Publication date Assignee Title
CN115710343A (en) * 2022-10-31 2023-02-24 浙江明士达股份有限公司 Folding-resistant anti-corrosion soft water bag material and preparation method thereof
CN115807345A (en) * 2022-10-31 2023-03-17 中纺新材料科技有限公司 Multifunctional elastomer composite material and preparation method and application thereof
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