DE1125854B - Process for the production of protective clothing - Google Patents

Description

The invention relates to a method for producing protective clothing, in particular from a woven or knitted existing protective gloves by applying them one or more times a coating, for example by dipping, on one side of the garment, the Coating consists of a substance that after application by solidification, hardening or the like. In a permanent solid material is converted and does not penetrate through the fabric, knitted fabric or the like. The type of protective clothing produced using this process is referred to below as »protective clothing of the type described ”. The permanent, solid material is usually a material based on synthetic resin.

Protective clothing of the type described is widely used both in industry and in the home is used, and a large part of such garments is knitted or knitted from cotton and coated with a suitably plasticized or stabilized polyvinyl chloride polymer, which the latter is heat treated so that it solidifies or hardens and an extremely hard, Forms a wear-resistant, stiffening coating for the knitted fabric, which is also resistant to numerous reactants is resistant, which can quickly lead to destruction with conventional materials. With such garments, especially, but not exclusively, gloves made with the aid a dipping process, the invention is concerned.

It is normally undesirable for the stiffening mass to penetrate the woven or knitted fabric. In the following and in the claims, penetration is to be understood as the complete penetration of the mass to the other side of the woven or knitted fabric. For example, it causes discomfort as well as irritation to the skin if the inside of a glove that is in contact with the wearer's skin has even localized small nodules of the reinforcing material. In order to prevent such penetration, special measures must be taken so that a high quality garment can be obtained. For example, in one known method, the coating composition is prevented from flowing through the woven or knitted fabric in the initial stage of the heat treatment step of the method by suddenly applying a high temperature. However, in order to prevent penetration during the application of the mass to the woven or knitted fabric, methods of manufacture
of protective clothing

Applicant:

James North & Sons Limited,
Hyde, Cheshire (UK)

Representative: Dipl.-Chem. Dr. W. Koch, Hamburg 4,

and Dr. Ing.R. Glawe, Munich 27, Cuvilliesstr. 16,

Patent attorneys

Claimed priority:
Great Britain August 8, 1958 (No. 25 446)

John Edwin Marsden and Harold White,
Hyde, Cheshire (UK),
have been named as inventors

the structure of the woven or knitted fabric as well as the theological properties (flow properties) the mass can be kept under control. For a given woven or knitted fabric, so the viscosity and other properties of the mass must be such that the penetration is prevented. However, the required viscosity as well as other properties of the mass set that Flow of mass from the woven or knitted fabric after application is a limit, and the thickness of the In a given case, the mass coating can also be caused by prolonged dripping or draining cannot be reduced significantly below a certain minimum.

For numerous uses, e.g. B. in the case of a glove where it is important that tactile ability is not affected by it, a thin coating should be aimed for. From the above For reasons, however, a lower limit is set for the thickness that can be achieved in the previously known methods.

The invention now primarily creates a method for applying an extremely thin cover

209 520/1

on garments of the type described while avoiding penetration.

According to the invention, the method of making garments is that described Kind in that by one or more handling ζ. B. by dipping with a reducing substance the thickness of the coating is reduced, the reducing substance the rheological properties at least the outer layer or layers of the

After the immersion, it was still on the knitted fabric located on the molded body drain under the influence of gravity for 20 minutes left and then again, still on the molding, immersed in a second mixture (Mixture B). This consisted of 100 parts by weight of the mixture described above and an additive of 170 parts by weight of dioctyl phthalate (A1-phanol phthalate) plasticizer, trade name

was 45 seconds, as above. The drainage under the action of gravity occurred during 20 minutes. In conclusion was the glove

vinyl chloride, was highly pliable, impervious, and of excellent quality. Another glove was in the same

gene is. The knitted fabric was first converted into a mixture (mixture A) of the following on the molding Composition immersed:

Components

Parts by weight

The coating was changed in such a way that a larger io "DA 79 P plasticizer (Phthalate of Aiphanoi 79)". Part of the coating substance in a manner known per se. The immersion time including the application can flow off or drip off, whereupon after the flow off or drip off the remaining parts solidify
Coating substance and any remaining part of the reducing substance by solidification, 15 heat-treated. The finished glove had hardened or the like. very thin and even coating made of poly-

Have experiments and tests carried out
show that, according to the invention, gloves of high quality coated with a durable material based on polyvinyl chloride are produced in a way that can be produced in a manner suitable for use in the second immersion process (mixture C) from the mass production Mix B with an additional 85 parts by weight of vinyl dung. Polymer". The glove thus obtained had similar properties to that made using the cotton material of a dry weight of Mixture B in a typical series of tests.

185 g / m ² of 35 (m / g) yarn with similar results were used

14.18 rows per centimeter and 13.39 of a mixture D instead of the mixture C erhal wales per centimeter used to measure that, the mixture D being similar to the mixture was preformed into a glove and on a thin, but instead of vinyl chloride polymer, commercial walled, Hollow moldings made of aluminum, called »Geon 202 Polymer«, »Silicasand« used was, only the surface obtained in this way was rougher.

In a further experiment, only alphanol phthalate plasticizers were used for the second immersion process, Trade name "DA 79 P plasticizer (Phthalate of Aiphanoi 79)", used (mixture E), which also showed a thin final coating. Other plasticizers can also be used, both monomeric and polymeric used will.

Other successful attempts have been made using other substances, e.g. B. toluene (mixture F) as a second mixture or as a component same. This resulted in peeling of the outer layer of the coating of the first coating material.

A by double immersion in mixture A with a draining time of 20 minutes after each immersion manufactured glove as well as a one-time immersion in the same mixture at essential extended draining time of over 40 minutes manufactured glove used. Any of these gloves was satisfactory but had a much thicker polyvinyl chloride coating than that gloves made according to the invention.

The number of successive immersions can of course be more than one, and so does the immersion can be made in different mixtures.

The immersion was carried out in such a way - The following are the results obtained, that the tissue only partially flows with the. In all investigations, Grundsigen Mixture was impregnated. The approximate woven or knitted fabrics of essentially the same Duration of introduction into the mixture was 65 kinds, and the immersion depth was used in each 5 seconds, and the immediately following falling out is regulated to the same value. After undressing was slowly cured over a period of time, the gloves were reduced to a standard length Carried out for 40 seconds. cut off by 267 mm. The weights of the hand

I. C. I. Limited polyvinyl chloride polymer powder, trade name "Corvic 65/50" 100

Tritolyl phosphate plasticizers

58.5

Alphanol phthalate plasticizer, trade name »DA 79 P plasticizer (Phthalate of Alphanol 79 «47.5

Calcium stearate dispersion (stabilizer) 3.75

Suitable heat and light stabilizers from Lankro Chemicals Limited, trade name »M. and P. L. Stabilizers "0.75

Green pigment from Geigy Limited, trade name “D. B. N. green dispersion «4.0

shoes after hardening are indicated for each case in the following:

hand
shoe mixture treatment weight
G 1 A. Single immersion,
Drain for 40 minutes 70.0 2 A. Double immersion,
Drain for 20 minutes each 75.5 3 A,
then B. 20 minutes after each
Drain immersion 54.0 4th A,
then C Drain for 20 minutes each
after each immersion 60.7 5 A,
then D Drain for 20 minutes each
after each immersion 57.0 6th A,
then E Drain for 20 minutes each
after each immersion 56.3 7th A,
then F Drain for 20 minutes each
after each immersion 57.0

From the above it can be seen that once immersed and completely (e.g. for 40 minutes) drained glove or one dipped twice in the same conventional mixture and glove drained significantly for a substantial period of time after each immersion has a thicker coating than a glove made according to the invention.

Similar studies have been carried out with similar success on gloves with a cover durable material based on polyvinyl acetate.

Two immersion liquids were used, namely an immersion liquid A consisting of 100 parts by weight of polyvinyl acetate emulsion and 10 parts by weight of glycerin, and an immersion liquid B, consisting of hot water.

Three gloves were made. In each case, a double interlocked active ingredient was used as the basic knitted fabric cotton of essentially the same type used, and immersion and curing was carried out in essentially a similar manner to the tests described above.

The glove 1 was immersed once in the immersion liquid A, allowed to drain for 20 minutes, cured and cut to standard size. The glove 2 was immersed in the immersion liquid A immersed, allowed to drain for 10 minutes, but again immersed in the immersion liquid A, again corn Allowed to drain for 10 minutes, hardened and cut to standard size. The glove 3 was immersed in the immersion liquid A, drained for 10 minutes, in the for 10 minutes Immersion liquid B immersed, allowed to drip off for 10 minutes, hardened and then cut to standard size.

The weights of the finished gloves were:

Glove 1 60 g

Glove 2 67 g

Glove 3 40 g

The same conclusions could be drawn as in the case of the gloves with a polyvinyl chloride cover.

There have been other attempts with similar results when putting a glove on hired durable material based on polyvinyl alcohol.

Two immersion liquids were used, namely an immersion liquid A consisting of 100 parts by weight of polyvinyl alcohol, 400 parts by weight of water and 25 parts by weight of glycerin, and an immersion liquid B consisting of hot water.

Three gloves were made. In each case, a double interlocked active ingredient was used as the basic knitted fabric cotton of essentially the same type used, and immersion and curing was carried out in essentially a similar manner to the tests described above.

The glove 1 was immersed once in the immersion liquid A, drained for 10 minutes serene and tailored to standard size. The glove 2 was immersed in the immersion liquid A, Drained for 5 minutes, immersed again in dip liquid A, 5 minutes left to drain for a long time, hardened and cut to standard size. The glove 3 was in the Dip liquid A immersed, drained for 5 minutes, in the dip liquid for 5 minutes B dipped, drained for 5 minutes, cured and cut to standard size. The weights of the finished gloves were:

Glove 1 33 g

Glove 2 38 g

Glove 3 26 g

The same conclusions can be drawn.

Claims (5)

Patent claims: 1. A method for producing protective clothing, in particular from a fabric or knitted existing protective gloves, by applying one or more times Coating, for example by dipping, on one side of the garment, the coating consists of a substance which, after being applied by solidification, hardening Od. The like. Is converted into a permanent solid material and not through the fabric, knitted fabric Od. Like. Penetrates, characterized in that by one or more times Treat, e.g. B. by dipping, the thickness of the coating is reduced with a reducing substance is, the reducing substance the rheological properties of at least the external Layer or layers of the coating changed in such a way that a larger part of the coating substance can flow off or drip off in a manner known per se, whereupon after the drainage or dripping solidification of the remaining coating substance and the possibly remaining part of the reducing substance by solidification, hardening or the like. Takes place. 2. reducing substance for performing the method according to claim 1, characterized in that that it consists of polyvinyl alcohol. 3. reducing substance for performing the method according to claim 1, characterized in that that it consists entirely or in part of a plasticizer. 4. Reducing substance for carrying out the process rens according to spoke 1, characterized in that that it consists of the coating substance to which a plasticizer is added. 5. reducing substance for performing the method according to claim 1, characterized in that that it consists of a solvent, especially toluene. Considered publications: German Patent Specifications No. 827 036, 837 831; German utility model No. 1761612; British Patent No. 604 876. © 209520/1 3.62