Gloves dipping

Use For coatings of rainwear, automotive filters, wall coverings, awnings, flooring, glove dipping, and laminating. 

In addition to the soHd form of natural mbber it is available as a soHd suspended in water, known as latex. Synthetic mbbers are also available in latex form. Latex has become an important commodity used in the manufacture of dipped goods for health and disease protection. The principal uses of natural mbber are as follows tires and retreading, 70% latex (gloves, balloons), 12% mechanical goods, 9% load-bearing components, 4% and other, 5%. 

Mixing of latex compounds is accompHshed by stirring ingredients into the latex in the form of water solutions, dispersions, or emulsions. Although the mbber softeners needed to process dry mbber are not necessary for latex, use of emulsified softeners or polymeric plasticizers in natural or synthetic latex compounds provides lower modulus in the finished products. This reduces hand fatigue and increases touch sensitivity in dipped mbber gloves. Mineral oils are also used as an economy. 

Fast, low temperature curing mbber compounds can be prepared by initial heat prevulcanisation of the Hquid latex and are marketed commercially (Revultex, Doverstrand Corporation). Rubber deposited from these often needs tittle more heat than that required to dry the deposit, to achieve optimum tensile strength and elongation. Such compounds are often used by small companies manufacturing thin-wall dipped medical latex products, such as examination gloves, as few compound preparation facilities are needed by the dipping company. 

Styrene—butadiene, acrylonitrile—butadiene, and butyl latices have also been prevulcanised, but this usually results in a lower wet gel strength. Where the mbber is to be deposited onto a fabric substrate, as in manufacture of fabric-lined gloves, the lower gel strength is not a problem. For unsupported dipped synthetic mbber products, however, the use of post-vulcanised compounds is more common. 

Dipped Goods. Gloves with and without cloth support are a typical example. Unsupported appUcations involve specialty medical gloves and weather balloons. Eor CR to compete with less expensive natural mbber, it must provide added value. Natural mbber medical examination gloves contain proteins that can cause an allergic reaction in both patients and medical personnel. Polychloroprene gloves avoid the problem for those individuals, but are too expensive for general use. Natural mbber weather balloons have less lift than CR balloons and are rapidly attacked by ozone in the upper atmosphere. 

Warning 4,4 -Tetramethyldiaminodiphenylmethane is thought to be carcinogenic [4]. Therefore, the dipping solution should be used if possible (gloves ). It is only in this way that it is possible to guarantee that the spray vapors do not come into contact with the skin or respiratory tract. 

Each beaker held the PEM film for one hour in sequence. Use safety glasses and gloves while working with the solutions. The sequence of beakers used to dip the PEM was set up as follows ... 

The bulb of the thermometer, which is maintained in position by a bored cork, dips into a layer of oil 1 cm. thick. (See Fig. 55.) Goggles and gloves must be worn. As soon as the temperature has reached 280° the sodium naphthalenesulphonate is added rather rapidly with stirring heating is continued with a somewhat smaller flame and the temperature is maintained between 260° and 280°. 

Discontinuous coating by dipping in a bath of liquid thermoplastic is very similar to moulding by dipping as used for PVC gloves (see Section 5.1.8 above). Wire articles, for example, can be coated with PVC to protect them and obtain a softer touch. 

Before World War II, hevea rubber accounted for over 99% of all elastomers used, but synthetic elastomers account for more than 70% of all rubber used today. NR and many synthetic elastomers are available in latex form. The latex may be used, as such, for adhering carpet fibers or for dipped articles, such as gloves, but most of the latex is coagulated and the dried coagulant used for the production of tires and mechanical goods. 

Other than tire use, there are few other significantly large application areas for natural mbber that can be identified, as indicated in Table 10. The use of natural mbber in latex products covers items such as gloves, condoms, balloons, catheters and other dipped goods, latex thread, foam and carpet backing, and rubberized coir and hair. In total, latex goods consume about 11% of world mbber production. Thereafter, there are four categories footwear,... 

Worldwide concern over the AIDS epidemic has sharply increased die demand for latex used in the preparation of ruhber gloves and similar dipped goods. Estimates are for a 5-7ff annual growth rate in this market... 

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