Find the most up-to-date version of DIN at Engineering DIN () Testing of organic materials; Separation test on fabric plies bonded together. Be notified when this Standard is updated or amended – Add. DIN Testing of organic materials; Separation test on fabric plies bonded together.
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The present invention relates to aqueous emulsions, a process for preparing them, materials prepared using the aqueous emulsions, a process for coating organic fibers using such aqueous emulsions, and textile substrates coated with the emulsions.
Physical testing – Sächsisches Textilforschungsinstitut e.V.
EP-A describes a free-radically crosslinking organopolysiloxane composition without silicone resin in an organic solvent for coating airbags. EP-A describes addition-crosslinking organopolysiloxane compositions without silicone resin in an organic solvent used for coating airbags, which organopolysiloxanes must have a specific molecular weight distribution.
EP-A describes addition-crosslinking organopolysiloxane compositions without silicone resin in an organic solvent used for coating airbags. The organopolysiloxanes used are costly trivinyl-stopped organopolysiloxanes. EP describes a liquid silicone rubber that is completely solvent-free. Aqueous emulsions without silicone resin of addition-crosslinking organopolysiloxanes are described for coating release papers in DE-A and for finishing textile materials in EP-B It is an object of the present invention to overcome the disadvantages of the above references and provide aqueous emulsions that have a low coating weight, improved adhesion of the coating, improved values in the ISO scrub test, and permits an inexpensive coating process.
R is identical or different hydrocarbyl radicals with 1 to 18 carbon atoms, which may be substituted, and. Examples of hydrocarbyl radicals R are alkyl radicals, such as methyl, ethyl, n-propyl, isopropyl, butyl, octyl, tetradecyl or octadecyl; cycloaliphatic hydrocarbyl radicals, such as cyclopentyl, cyclohexyl or methylcyclohexyl; aryl radicals, such as phenyl; alkaryl radicals, such as tolyl; aralkyl radicals, such as benzyl or phenylethyl.
Examples of substituted hydrocarbyl radicals are halogenated radicals, such as 3,3,3-trifluoropropyl, 3-chloropropyl or chlorophenyl. Cyanoalkyl radicals, such as cyanoethyl, may be present. Radicals with unsaturated aliphatic groups, such as vinyl, allyl, hexenyl or cyclohexenyl, may be present.
The organopolysiloxane can be identical interpolymers or mixtures of different inter-polymers with identical or different degrees of polymerization.
If the diorganopolysiloxanes contain different diorganopolysiloxane units, the distribution may be random or block. The following weight percents are based on the total weight of the emulsion. In the organopolysiloxane with at least 3 Si-attached hydrogen atoms per molecule, the silicon valencies not saturated with hydrogen and siloxane oxygen atoms are preferably saturated with methyl, ethyl or phenyl radicals.
However, all radicals described above as R can be present. Catalysts 3 promoting the addition of Si-attached hydrogen to aliphatic multiple bonds can be any desired catalysts which are known to promote this reaction. Examples of such catalysts are preferably metallic, finely divided platinum platinum solruthenium, rhodium, palladium or iridium. These metals may also be applied to solid supports, such as silica, alumina or activated carbon, ceramic materials or mixed oxides or mixed hydroxides.
Platinum compounds are preferred for use as catalysts in the product of this invention. In the present invention, the amounts of platinum catalyst used is generally between 3 and ppm, based on the siloxane content.
Preference is given to using a platinum content of ppm, based on the polysiloxanes used. Examples of organosilicon compound 4 useful as adhesion promoters are silanes with hydrolyzable radicals and vinyl, acryloyloxy, methacryloyloxy, epoxy or acid anhydride groups attached to silicon via carbon. Preference is given to using a reaction product of vinyltriacetoxysilane and the silane of the formula STR1.
It is possible to use one type of adhesion promoter, or mixtures of two or more silanes or their reaction products or partial or mixed hydrolyzates. The silane resin 5 may be in the form of an aqueous emulsion. The organosilicon compounds used in this invention are commercially available products or preparable by processes customary in silicone chemistry.
The organosilicon compounds of components 124 or 5 may each be individual organosilicon compounds or a mixture of different organosilicon compounds. Aqueous emulsions containing the above mentioned ingredients may be prepared using any desired emulsifiers 6 which are used for preparing organopolysiloxane emulsions.
Preference is given to nonionic emulsifiers. Suitable emulsifiers are dij and nonionic emulsifiers. Examples are sulfonic acid and its salts which can act as emulsifier and also alkylsulfonates, such as sodium laurylsulfonate, benzenesulfonates substituted by aliphatic hydrocarbyl radicals, such as sodium dodecylbenzenesulfonate, naphthalenesulfonates substituted by aliphatic hydrocarbyl radicals, polyethylene glycol sulfonate and lauryl phosphate, polyethylene oxide, polypropylene oxide, interpolymers of ethylene oxide and propylene oxide, stearates and phosphates.
In addition to the above-mentioned ingredients, the emulsions of the present invention may include further ingredients, such as fillers, for example alumina, aluminum hydroxide, pigments and stabilizers.
The present invention further provides a process for preparing the aqueous emulsions, which comprises emulsifying ingredients 1 to 7. The 535530 invention further provides a process for coating textile substrates, which comprises applying aqueous emulsions to an 53503 textile and in one step vulcanizing the emulsions on textile substrates and drying the coated textile.
In the process of 35530 invention, the aqueous emulsions can be applied to wet textiles coming directly from a washing or cleaning process. The vulcanization of the silicone coating and the drying and shrinking of the textiles can be carried out in one operation.
To avoid premature crosslinking, the emulsions of the invention are stored in at least two different components. One component comprises the siloxanes with the unsaturated aliphatic groups, another component comprises the siloxanes with Si-attached vin. The corresponding auxiliary and additive substances may be present in either one or both of the components.
Coated airbags, coating material and coating process – Wacker-Chemie GmbH
The application of the products of the invention can be carried out in a conventional manner. Examples are dipping and pad-mangling, brushing, casting, spraying, rolling, printing, knife-coating, using a Meyer rod or an air brush or by lick-rolling and screen printing. The application of the coating material takes place during the washing process or immediately thereafter. The vulcanization takes place in one operation at the same time as the drying and shrinking process.
In the case of wovens which have to be washed and dried, which is true of man-made fiber wovens in particular, the composition of the invention can be applied directly to the fabric immediately following washing while it is still wet. The vulcanization takes place at the same time as the drying process. This is particularly desirable and advantageous in the case of wovens used for manufacturing airbags.
Application by the above mentioned methods is followed by drying and vulcanization of the coated fabric, in a heat duct which can be heated by hot air, infrared light, gas burners, heat exchangers or other energy sources.
The residence time required for vulcanization depends on the coating weight, the thermal conductivity of the fabric and the heat transfer to the coated textile, and can vary between 0. Apart from most customary heat ducts, the drying and vulcanization can also be carried out by means of other technical drying equipments, such as hot roll calenders, heatable laminating presses, heatable plate presses or hot contact rolls and also by means of festoon dryers.
The textiles coated according to this invention can also be dried and vulcanized using microwaves.
The products of the present invention can be used for coating or finishing textile materials of any kind. Wovens of all weave constructions, nonwovens, loop-drawn knits, lays, loop-formed knits from all customary yarns and fibers, natural fibers such as cotton, glass, wool, silk, man-made fibers, such as polyamides, polyester viscose, polyethylene, polypropylene, polyurethane, silk, viscose, cellulose can be coated. The applications for the textiles thus finished are numerous.
Examples are sportswear, sports articles, such as sails, boat covers or materials for rucksacks and tents dih protective clothing. Industrial applications, such as tarpaulins, conveyor belts, compensators, foldable containers. Polyamide or polyester fabrics finished with the products of this invention by the process of this invention can be used with particular advantage for manufacturing airbags for motor vehicles.
Industrial fabrics usually need to be washed, dried and shrunk.
This is true 553530 the use for manufacturing airbags. All prior art coating processes require a separate coating step after the washing and drying. In the process of the present invention, the coating material can be applied directly in or after the washing process and vulcanized during the drying process. There is no need for an additional coating process. This represents a significant saving of energy, time and costs. Airbags are frequently manufactured using coated wovens.
Wovens coated according to the present invention provide technical advantages. The coating offers protection against the hot gases of the propellant charge.
Yarn-to-yarn friction, which leads to reduction in the tensile strength and is created by vibrations, can 535300 prevented by the present elastomer coating. The coating according to the present invention confers a better aging resistance to the fabric. An advantage of the coating process of this invention is that the costs of an additional coating step are saved. According to the invention, there is provided an aqueous silicone system which is applied to the fabric directly after washing while it is still wet and can be vulcanized during the drying step.
This coating system is an aqueous silicone coating system which, after vulcanization, has exactly the right property profile for an airbag.
A lick-roller is used to transfer this emulsion to a wet dtex polyamide fabric. The residence time in this heat duct is 3 minutes. Example 1 is repeated without a silicone resin component. The fabric obtained has the following properties:.
Example 1 is repeated with the difference that the formulation described in Example 1 was mixed with g of water. The fabric obtained had the dkn properties:. Example 1 was repeated without the adhesion promoter described in Example 1. The formulation used and described in Example 1 was knife-coated onto a polyester fabric. The coating obtained had the following properties:. After storage, the surfaces were not stuck or welded together. A SumoBrain Solutions Company. Search Expert Dun Quick Search.
Coated airbags, coating material and coating process. United States Patent Aqueous emulsions comprising 1 an organopolysiloxane with SiC-attached vinyl groups in the terminal units, 2 an organopolysiloxane with at least 3 Si-attached hydrogen atoms, 3 a catalyst promoting the addition of Si-attached hydrogen to aliphatic multiple bonds, 4 an organosilicon adhesion promoter, 5 a silicone resin, 6 an emulsifier and 7 water.
Click for automatic bibliography generation. EP Process of coating substrates. EP Siloxane coating composition for air bag. EP Air bag coating composition, air bag and preparation thereof. EP Coating compositions and air bags coated with them. EP Liquid silicone rubber coating composition for dni to air bags. EP Silicone emulsion compositions. EP Coated fabrics for air bags. EP Silicone 35530 base material and air bag base material. EP Elastomeric silicone composition and its use, mainly coating 55330 airbags.
Encyclopedia of Polymer Science and Engineering, vol.