EP3014016A1 - Tissus enduits - Google Patents

Tissus enduits

Info

Publication number
EP3014016A1
EP3014016A1 EP14742572.2A EP14742572A EP3014016A1 EP 3014016 A1 EP3014016 A1 EP 3014016A1 EP 14742572 A EP14742572 A EP 14742572A EP 3014016 A1 EP3014016 A1 EP 3014016A1
Authority
EP
European Patent Office
Prior art keywords
fabric
coated fabric
silicone rubber
rubber composition
coated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14742572.2A
Other languages
German (de)
English (en)
Inventor
Wayne John Harrison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brennan Enterprise Ltd
Original Assignee
Brennan Enterprise Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brennan Enterprise Ltd filed Critical Brennan Enterprise Ltd
Publication of EP3014016A1 publication Critical patent/EP3014016A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
    • 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
    • D06N3/128—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 silicon polymers
    • 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
    • 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
    • B32B2262/0276—Polyester 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • 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
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/02—Layered products comprising a layer of natural or synthetic rubber with fibres or particles being present as additives in the 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/10—Layered products comprising a layer of natural or synthetic rubber 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/20—Layered products comprising a layer of natural or synthetic rubber comprising silicone rubber
    • 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
    • B32B5/22—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • D06N2201/00—Chemical constitution of the fibres, threads or yarns
    • D06N2201/02—Synthetic macromolecular 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
    • D06N2201/00—Chemical constitution of the fibres, threads or yarns
    • D06N2201/02—Synthetic macromolecular fibres
    • D06N2201/0263—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
    • D06N2201/00—Chemical constitution of the fibres, threads or yarns
    • D06N2201/04—Vegetal fibres
    • D06N2201/042—Cellulose fibres, e.g. cotton
    • 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
    • D06N2209/12—Permeability or impermeability properties
    • D06N2209/121—Permeability to gases, adsorption
    • D06N2209/123—Breathable
    • 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
    • D06N2209/12—Permeability or impermeability properties
    • D06N2209/126—Permeability to liquids, absorption
    • D06N2209/128—Non-permeable
    • 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
    • D06N2209/16—Properties of the materials having other properties
    • D06N2209/1671—Resistance to bacteria, mildew, mould, fungi
    • 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
    • D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
    • D06N3/0095—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by inversion technique; by transfer processes
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/02—Moisture-responsive characteristics

Definitions

  • the invention relates to coated fabrics and in particular to waterproof, breathable coated textiles that can be used, for example, in the manufacture of protective and leisure clothing, bags and luggage.
  • Waterproof, breathable coating and laminates for textiles are well known in the prior art, the terms “waterproof and “breathable” relating to the coating or laminate being impervious to liquid water and permeable to water vapour respectively. This imparts a high degree of comfort to the wearer, preventing condensation of sweat inside the garment while providing a waterproof barrier to keep the wearer dry in all types of weather.
  • GORE-TEX Materials sold under the registered trade mark GORE-TEX are based on an expanded polytetrafluoroethylene membrane (e.g. US patent 3,953,583) to produce a microporous membrane that can be laminated to a fabric.
  • the pores in the membrane are 20,000 times larger than a water molecule allowing the passage of vapour, while the extremely low surface energy of the membrane imparts high waterproofing properties.
  • Microporous coatings based on polyurethanes are also known in the art, as described by US patents 4,560,611, 5,520,998, 5,626,950 and 5,692,936. These are produced by direct coating a polyurethane solution onto a fabric, then coagulating the solution to produce a network of micropores in the polymer structure.
  • hydrophilic polyurethanes Another group of coatings are based on hydrophilic polyurethanes. These are usually directly coated onto a fabric, and rely on the incorporation of hydrophilic segments in the polymer chains. Water molecules from perspiration are therefore able to diffuse from inside the clothing of the wearer through the polymer layer via a stepwise process and transported to the outside environment.
  • the functionality of these hydrophilic layers relies on a humid environment building up inside the breathable garment. The higher the humidity inside the garment, the faster the rate of diffusion of water molecules through the polymeric layer.
  • These types of polyurethane coatings usually contain both hydrophilic and hydrophobic segments to incorporate breathability and waterproofness respectively.
  • microporous membranes There are a number of problems associated with both the microporous membranes and the hydrophilic coatings.
  • the performance of microporous membranes can deteriorate over time due to contamination of the pores by soil, detergents and body oils. Blocking of the pores in this manner reduces the breathability of the membrane and can also alter the surface chemistry of the membrane, resulting in the increased likelihood of liquid water penetration. Gore attempted to resolve this problem by the application of a very thin layer of hydrophilic polyurethane on top of the microporous PTFE as a protective layer to prevent the microporous layer from contaminants.
  • hydrophilic based polyurethane breathable coatings There are also problems associated with hydrophilic based polyurethane breathable coatings.
  • the main one is their susceptibility to swelling in water. By their very nature, water molecules are attracted to the hydrophilic segments in the polymer. Water molecules are therefore able to "solvate” the hydrophilic segments within the polymer and swell the membrane. This can impart to a "clammy” feeling to the wearer as well as a loss of coating strength. In severe cases it can lead to a loss of adherence to the fabric itself, causing delamination. This is quite common when the garment is subjected to harsh aqueous environments.
  • the present invention has been made from a consideration of the above.
  • a coated fabric wherein the coating comprises an elastomeric, heat curable silicone rubber composition containing a porous inorganic filler at sufficiently high loading to produce a percolated porous structure, the percolated porous structure being permeable to water vapour.
  • a gas is able to pass through the porous structure via a series of holes or pathways.
  • the invention achieves porosity throughout the rubber coating.
  • the very nature of the inorganic filler used in the formulation is that of particles containing a plurality of micron and sub-micron pores as an integral part of its structure. In the silicone rubber formulation, below a certain level of filler these particles are not in close proximity to each other. However, when a certain level, or amount of filler is incorporated into the rubber matrix, a mixed matrix compound is achieved where the porous particles are in sufficiently close proximity to each other to allow the passage of water vapour through each porous particle straight through the continuous mixed matrix coating i.e.
  • the "percolation threshold” is reached to produce a true percolated structure throughout the mixed rubber/filler matrix.
  • a continuous connected component does not exist, but above the percolation threshold there exists a connected component to scale of the system size.
  • the invention tends not to allow the passage of liquid water (up to a hydrostatic head pressure of at least 2000 mm) due to the very hydrophobic nature and low surface energy of the silicone rubber.
  • the "percolated structure" of the proposed invention can be described by the interconnectedness of the porous filler particles throughout the mixed matrix compound that gives rise to continuous connected porous pathways to allow the passage of water vapour molecules throughout the rubber matrix, giving rise to its breathability.
  • the silicone composite solution can be coated on a natural or synthetic fabric which may be woven, nonwoven or knitted and comprise, for example, polyester or polyamide.
  • the coating process may involve direct coating onto the fabric substrate.
  • the coated fabric of the invention comprises a waterproof, breathable coated textile that can be used for the manufacture of a variety of articles, such as protective and leisure clothing, bags and luggage.
  • Silicone rubber exhibits gas permeability due to the zero energy of rotation about the silicon-oxygen bond in the backbone chain. Together with the plurality of methyl groups on the outside of the polymer chains (which in turn impart water repellent properties), intermolecular interaction is very low causing a large free volume between polymer chains, allowing the diffusion of gas molecules through the polymer matrix.
  • the coated fabric of the invention therefore incorporates a porous filler which by creating a percolated structure within the silicone rubber composition, complements the permeable properties of the silicone rubber to produce a truly water-vapour permeable, liquid water impermeable membrane.
  • Double texture comprising an outer layer fabric (e.g. polyester/polyamide (Nylon)) laminated to a second, inner liner fabric (polyester) with the silicone composite layer in between.
  • Double texture (tri-laminate) fabric constructed from an outer fabric and an inner fabric (e.g. polyamide, polyester/polyamide (Nylon)) with the silicone coating in between. This type of construction would be useful for applications where durability and fire retardance are required.
  • an inner fabric e.g. polyamide, polyester/polyamide (Nylon)
  • the silicone rubber coating is a solution based formulation that is ideally coated directly onto a fabric.
  • the silicone rubber composition contains the following polysiloxane and solid filler.
  • the silicone rubber contains any of catalyst, adhesive and/or adhesion promoter and a solvent.
  • the various components of the rubber coating may be included as follows :- Compound Parts (g)
  • the above formulation may be based on a condensation, peroxide or addition cured silicone, which will determine the type and quantity of catalyst (organotin, peroxide or platinum type).
  • the solvent level is based on phr of solid rubber to produce a solution of 35-50% solids.
  • a pre mixed silicone polymer solution in toluene may also be used, which would reduce the amount of additional solvent needed.
  • the breathable silicone rubber coating of the invention has advantages over breathable polyurethane systems in as much that it is non-swelling in aqueous environments with no loss of adhesion in tri-laminate constructions. As it is an inherent property of silicone rubber, the coating also has excellent resistance to ageing (e.g. no hydrolysis, another issue with PU systems) and excellent flexibility and low temperature performance.
  • the breathable silicone rubber composite has an extremely porous nature due to the high porosity of the diatomaceous earth filler that is used in the silicone formulation.
  • the high porosity and surface area of the composite raises the possibility of extra functionality being designed into the breathable coating. Possibilities include:
  • insect repellent agents could also be incorporated into the filler particles. This would be advantageous for hiking and camping clothing in areas where a high population of insects is present.
  • FIG. 1 shows a schematic diagram of a tri-laminate waterproof breathable construction of the invention and the water vapour evaporation pathway therethrough.
  • a coated fabric 10 comprises a first woven fabric 11 having a plain weave construction made from polyamide. This is direct coated on one side thereof with a silicone rubber composition 12.
  • the silicone rubber composition has the following components :-
  • a porous filler 14 in one embodiment this comprises natural diatomaceous earth (or diatomite) which is a soft siliceous sedimentary rock crumbled into a fine powder.
  • the porous filler while typically natural diatomaceous earth, may also be calcined and flux-calcined. Calcination is the heat treatment of a material in the presence of air or oxygen. Flux-calcination is the heat treatment of a material in the presence of a fluxing agent.
  • (C) a catalyst (not shown), which can be either an organo-tin compound, platinum catalyst or peroxide.
  • a catalyst (not shown), which can be either an organo-tin compound, platinum catalyst or peroxide.
  • CI 4-010 an organo-tin catalyst commercially available from Itac Ltd can be typically used.
  • (D) additionally (not shown), a mixture of glycidoxypropyltrimethoxysilane and vinyltriacetoxysilane adhesion promoter, such as the commercially available SYL- OFF 297 from Dow Corning. This is also supplied under the product code C14-025 from Itac Ltd.
  • the ratio of mixing the components A-E is set out below.
  • a second plain weave fabric 15 also made form polyamide is situated on the other side of the coating such that the silicone coating is sandwiched between the two fabrics.
  • the molecular sieve compound needs to be added to the coating formulation and thoroughly mixed and left to stand for not less than two hours before coating onto the fabric.
  • a typical molecular sieve compound employed for this purpose is a porous, crystalline aluminosilicate powder such as those marketed under the brand name "Sylosiv”.
  • the formulation should be mixed in a mechanical mixing device, such as a Z- blade mixer.
  • Components (A) and (B) should be thoroughly mixed in the first instance for 20-30 mins to produce a homogenous "dough" mix, followed by components (C), (D) and (E).
  • the complete formulation should then be mixed for a further 20-30 mins until a completely homogenous solution is produced. Measured solids content of the solution should be 35-45%. After the final mix, the formulation will have a useable pot life of 8 hours.
  • the water vapour pathway is in the direction of arrows A.
  • Example 1 Tri-laminate coated fabric (as shown in Fig. 1)
  • the silicone composite solution can be coated on a synthetic woven or knitted fabric e.g. polyester or nylon using direct coating (knife over roller) method.
  • a multiple number of passes is required in order to achieve a coating weight of 70- lOOgsm.
  • a coating weight of around 85gsm should be achieved. It is usual for at least three coating passes to be needed to achieve this weight. It is important to ensure the temperature is at a temperature that enables evaporation of the solvent, but is not too high as to cause premature cross-linking of the silicone composite.
  • a temperature of 60-80°C should be maintained in the heated spreading chest.
  • the uncoated side of the fabric will function as the "inner" lining of the waterproof, breathable fabric.
  • PSA silicone based pressure sensitive adhesive
  • a commercial grade PSA from Dow Corning known as DC7358 (a peroxide cured adhesive) can be used for this purpose.
  • Peroxide typically dibenzoyl peroxide
  • a light coating of adhesive is then applied over the silicone coating, the solvent is allowed to evaporate through the heated chest (temperature must not be over 75°C or premature crosslinking of the adhesive will occur).
  • the coated fabric is then laminated through two pressurised rollers against a second, uncoated fabric to produce the tri-laminate construction.
  • the laminated fabric can then be cured off-line.
  • the fabric coating can be cured for 30-45 min at a temperature of 120 - 140°C. Lower temperatures down to 100°C can be used for longer curing times of up to 6 hours.
  • the tri-laminate water proof breathable fabric can be used (but not limited to) garments for water sport and marine applications such as surface suits, dry suits, sailing garments, etc.
  • Example 2 Single coated fabric
  • the single coated fabric is manufactured in a similar way to the tri-laminate.
  • the coated fabric serves as the outer fabric shell as opposed to the inner layer fabric, and the fabric is not then laminated to another fabric.
  • silicone rubber due to the non-stick properties of silicone rubber, it is necessary to apply a breathable, low melting point thermoplastic top coat on the breathable silicone layer in order to facilitate the adhesion of seam sealing tapes.
  • a polyurethane coating solution such as Larithane BTH231 can be used for this purpose. Swelling effects of the polyurethane are not as critical as the fabric is not laminated to another outer fabric, where loss of peel adhesion could become an issue.
  • the breathability of the fabric has been internally tested according to BS7209 "Water vapour permeable apparel fabrics".
  • a circular test piece of the fabric is fixed over the rim of a circular aluminium dish that contains a measured amount of distilled water.
  • the outside surface of the rim of the dish is then sealed so that the only pathway water vapour can take is through the fabric.
  • the total weight of the dish, fabric and water is measured, whereupon the dish is then placed on a circular turntable that rotates to prevent a microclimate of humid air above the surface of the fabric.
  • the dish is then left in atmospheric conditions of 65% relative humidity and 20°C for at least 16 hours.
  • the weight of the whole test dish is then measured to calculate the loss of water in the form of vapour through the dish.
  • WVTR water vapour transmission rate
  • the waterproof breathable fabric as described in this specification will typically have a WVTR of 400-650 g/m2/24 hours, more typically around 500 g/m 2 /24 hours and a WVPI of 50-90%, more typically around 75%.
  • Hydrostatic Head pressure rating (waterproofness):
  • test BS3424-26 This is described as the water pressure required to leak (penetrate) through the fabric. This is determined by carrying out test BS3424-26, which subjects a test piece of fabric to pressure from either a column of water or water pressurised from a compressor. Any fabric that can withstand a pressure equivalent to a column height of 1000mm is deemed "waterproof although in practice ratings of 2,000-20,000mm are expected from quality products.
  • the waterproof breathable fabric as described in this specification demonstrated a hydrostatic head rating of at least 2,000mm according to internal tests.
  • the peeling strength is simply the force required to peel the laminated fabrics apart, as measured on a tensometer.
  • the test piece is a 50mm wide strip of the fabric with both face and back fabrics delaminated from each other. The force in N/50mm is then measured that is required to peel the fabrics apart.
  • the tri-laminate fabric as described previously typically has a peeling strength of 4 - 8 N/50mm, more typically around 6 N/50mm. The peeling strength will remain unaffected after the test piece has been immersed in a 2% salt water solution for 24 hours.
  • the invention contemplates the optional addition of a thixotropic filler such as fumed silica to the base silicone rubber formulation. This would alter the rheological properties by increasing the viscosity of the coating formulation and reduce "strike- through" of the solution through the fabric. This leads to reducing the degree of coating penetration through the fabric leading to a better appearance and handle of the coated fabric.
  • a thixotropic filler such as fumed silica
  • An improvement in adhesion of silicone rubber to the fabric may optionally be achieved by applying a pre-treatment of an organic silane compound to the fabric prior to applying the rubber coating. The silane pre-treatment would typically be applied by a dipping technique into a silane solution followed by drying to evaporate the solvent.
  • the diatomaceous earth filler may be dried prior to mixing into the rubber formulation, as excess moisture present in the filler disrupts the condensation cross-linking reaction.
  • the addition of a molecular sieve compound into the rubber/filler solution 2-3 hours prior to coating removes the moisture from within the coating solution, thus eliminating any requirement to pre-dry the filler.
  • One or more blowing agents may be used to increase the porosity of the adhesive. Increasing the elastomer content of the adhesive may improve the peel strength.
  • the currently preferred porous filler used to create a percolated porous structure is natural diatomaceous earth, there are a range of other porous fillers which may be used in place of or in combination with diatomaceous earth.
  • Such fillers may include kaolinite, amorphous silica, zeolites, metal organic frameworks, porous carbon blacks and montmorillonite clay.
  • Additional fillers may be incorporated into the composite formulation to improve the physical properties of the composite coating. These include, either alone, or in combination, any of calcium carbonate, barium carbonate, talc, mica, hydrotalcite, calcium sulphate, barium sulphate, aluminium hydroxide, magnesium hydroxide, calcium oxide, magnesium oxide, titanium oxide, and zinc oxide.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

Cette invention concerne un tissu portant un enduit qui comprend une composition élastomère à base d'un caoutchouc silicone thermodurcissable contenant une charge inorganique poreuse. Le matériau de charge est à un niveau de chargement suffisamment élevé pour produire une structure poreuse percolée, ladite structure poreuse percolée étant perméable à la vapeur d'eau.
EP14742572.2A 2013-06-28 2014-06-24 Tissus enduits Withdrawn EP3014016A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1311647.0A GB201311647D0 (en) 2013-06-28 2013-06-28 Coated fabrics
PCT/GB2014/051928 WO2014207450A1 (fr) 2013-06-28 2014-06-24 Tissus enduits

Publications (1)

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EP3014016A1 true EP3014016A1 (fr) 2016-05-04

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EP14742572.2A Withdrawn EP3014016A1 (fr) 2013-06-28 2014-06-24 Tissus enduits

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US (1) US20160130747A1 (fr)
EP (1) EP3014016A1 (fr)
CN (1) CN105518211A (fr)
AU (1) AU2014300750A1 (fr)
GB (2) GB201311647D0 (fr)
WO (1) WO2014207450A1 (fr)

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CN107163326B (zh) * 2017-05-25 2020-02-18 际华三五一七橡胶制品有限公司 一种透气防水胶布复合胶及胶布雨衣
CN108078035A (zh) * 2017-12-13 2018-05-29 仙桃市鼎业劳保用品有限公司 防护服
CN108867064B (zh) * 2018-07-20 2019-11-26 西安科技大学 一种以氧化镁为原料制备廉价稳定超疏水织物的方法
CN109338816B (zh) * 2018-11-21 2021-05-14 浙江双东装饰材料有限公司 一种耐磨隔音墙纸及其制备方法
US11872793B2 (en) * 2020-04-27 2024-01-16 Patrick Kelly Method of preparing antimicrobial sheets for articles of manufacture having antimicrobial properties
US11937653B2 (en) * 2020-07-09 2024-03-26 Vitiprints, LLC Smart mask
TWI831097B (zh) * 2021-12-09 2024-02-01 財團法人紡織產業綜合研究所 隔熱織物

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Also Published As

Publication number Publication date
CN105518211A (zh) 2016-04-20
GB201311647D0 (en) 2013-08-14
GB201522041D0 (en) 2016-01-27
AU2014300750A1 (en) 2016-02-04
US20160130747A1 (en) 2016-05-12
WO2014207450A1 (fr) 2014-12-31
GB2535300A (en) 2016-08-17

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