DE1504008C - Method of waterproofing a microporous plastic sheet - Google Patents

Description

The permeability of a corresponding non-porous vinyl resin is only 0.4 g / dm ² .

Example 2

A number of microporous plastic sheets are produced according to Example 1, but with the water-repellent Silicone-based agent has been replaced by other agents. It come to use Zelan S, a cationic aqueous dispersion of a long chain nitrogen complex, and FC-205, a fluorocarbon compound.

Three samples are produced from each composition of the prepared resin grains, different with an air permeability of 0.9 m ³ , 1.5 m ³ per minute and 3.0 m ³ , and per m ^{2 of} surface area. The water resistance of these samples is measured by means of the dynamic water column test according to ASTM D 583-58, expressed in cm water column.

The results are shown in the table below, the amounts of Zelan S and FC-205 are expressed in parts by weight per 100 parts by weight of resin. Goes out of the table show that adding 2 parts Zelan S and 1 part FC-205 gives the best results will.

FC-205 Water resistance in cm of water column Air permeability of 3.0 m ³ Zelan S. at a 1.5 m ³ 50 0 0.9 m ³ 60 50 2.0 0 60 60 60 3.0 2.0 60 80 70 2.0 1.5 80 80 80 2.0 1.0 80 80 70 2.0 0.5 80 80 60 2.0 0.25 80 70 60 2.0 0.10 70 60 2.0 60

Two samples with an air permeability of 0.9 m ³ per minute and per m ² , one of which contained only 2.0 parts of Zelan S and the other 2.0 parts of Zelan S and 1.0 part of FC-205 as a water-repellent agent , were subjected to a static water column test according to ASTM D 583-58. In this experiment one measures the number of minutes during which the material is resistant to a water column of 50 cm. For the sample with only 2.0 parts of Zelan S this time is 15 minutes and for the sample with 2.0 parts of Zelan S and 1.0 part of FC-205 it is more than 60 minutes. A time of 60 minutes is considered a criterion for good water resistance.

Claims (1)

Claim: A method of waterproofing a micro-porous plastic sheet by mixing the Starting materials, layering of the synthetic resin grains obtained and compression of the obtained layer of synthetic resin grains between two webs of fiber material under heat to io drove until the synthetic resin grains sinter together to form a sheet, thereby marking i c.hn e t that when the raw materials are mixed, a water-repellent agent based on a .Silicone compound, a fluorocarbon compound 15 manure, a nitrogen complex with a long chain, or mixtures of two or three of these substances is evenly distributed among the plastic grains. This object is achieved according to the invention in that when the starting materials are mixed, a water-repellent Agent based on a silicone compound, a fluorocarbon compound, a nitrogen complex with long chain or mixtures of two or three of these substances evenly under is distributed to the plastic grains. The formation of the microporous plastic sheet takes place in that a uniform layer prepared synthetic resin grains is placed on a web of fiber material, on the layer a second web of fibrous material is placed and the entire. Formations between two heated, converging ones Plates carried wild, so that the plastic grains are pressed together and heated and sintered together to form a continuous sheet. Tndem on one of the tracks an adhesive, e.g. B. an aqueous latex of an emulsion polymer of vinyl chloride is applied, 20 one can in the above-mentioned way a historical Got the product. It is also possible to have a To unite tissue mechanically with the plastic sheet, and / or the plastic sheet to shape. The permeability for gases of the end product The invention relates to a method for water can be controlled by a suitable adjustment of the sealing of a microporous plastic sheet compression of the layer during the pressing process by mixing the starting materials, layering. The compression can be, for. B. of the synthetic resin grains obtained and together between 4: 1 and 2: 1, the permeability of the layer of synthetic resin grains obtained increases if the compression between two webs of fiber material under heat is selected to be smaller. The permeability for air is at supply until the synthetic resin grains sinter together to a sheet at a pressure difference of 63.5 cm water column. between 0.9 and 6 m ³ per minute and per m ² . A method of the type mentioned above is per se "The invention" is made on the basis of the- "below known. The examples explained in more detail by using this method were achieved Plastic sheets have a very high 35 ... ■ Permeability to gases such as B. Air and water- '. I ₁ steam up. When used for clothing and example 1 For fabric finishing purposes, this property enhances the Comfort, because air and water vapor inclusions A dry mixture with the following between the plastic sheet and the body of the 4 ° the composition made in parts by weight: Can be avoided by the user. If desired, can ^: - - on one of the webs of fiber material a copolymer of 97% vinyl chloride and Applying adhesive so that the plastic formed '■ - 3 ° / ₀ Vinyl acetate 100 sheet sticks to this web and a layered N-octyl-N-decyladipate 52 Product is obtained. 45 N-octyl-N-decyl phthalate 22 Esistauchbereii ^ a process ^ has become known, '^ - Mönomefer plasticizer of epoxy the ester-Tvos 6 for making a permeable membrane the starting materials, in this case a suspended one. ^ '.'"'." Metal powder and a suspended binder with a barium-cadmium-zinc complex 2 mixed with each other and after formation of a sheet 50 · pigment _Λ . ,,, .........,., ...... 2 this is sintered together, with the binding agent - water-repellent agent with 50 ° / ₀ ak-fluorohydrocarbons among the starting material harmful silicones and 50% solvent be shared. medium 3 -In contrast to the usual non-porous-art- - - ■ · - Sheets of fabric, which are generally well waterproof, 55. Mixing is done in a rapidly rotating leaves the watertightness of the stirring device after the above and continues until the soft-mentioned known methods produced micromachines practically completely porous into the resin grains Plastic sheets leave a lot to be desired. is worked, the .active silicones are thereby from Attempts have already been made to overcome this disadvantage by having plasticizers while the solvent fix that a water 6c evaporates on the plastic sheet due to the heat generated. From the repellent layer is applied. This layer of prepared resin grains is worn out in the above but fast in use, so that written way by sintering a microporous the watertightness is lost. Sheet formed. The invention has the purpose of providing an improved microporous plastic sheet that is produced To create a method with which the plastic sheets 65 have a repellent effect on liquid water, but which in addition to a very good permeability for water vapor, a permeability of 14 g / dm ² for gases at the same time a permanent water resistance in 24 hours at a Have a temperature of 38 ⁰ C and seal. a relative humidity of 95%; by-