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INDOSSABILI
Chemical-Resistant Gloves: Butyl Latex over Natural Rubber on a Cotton Liner (Hart & Collyer, US 4,190,685, 1980)
Dipped rubber gloves built in layers on a knitted cotton liner: one coat of natural rubber, then five coats of butyl rubber, which lets very little liquid or vapour through. Each coat is dipped from latex on a porcelain hand form, and the whole glove is cured under steam and air pressure. Made in Canada to protect soldiers against chemical warfare agents; worn gloves showed no penetration in 24 hours of field use.
Result: flexible, soft chemical-resistant gloves with a comfortable cotton lining.
Source: J. A. Hart and J. C. Collyer, US 4,190,685 (1980), latex method. Unknown: sizes, the pigments. Picture: the patent drawing.
Avanzato
Unknown
Istruzioni
1
1
Sew the cotton liner
Sew the cotton liner
Cut knitted or interlock cotton fabric to a glove shape and sew it into a glove. It stretches both ways, soaks up sweat and makes the glove easy to put on and take off. Not given: sizes, the knit.
Materiali per questo passaggio:
Maglina di cotone1 linerStrumenti necessari:
Forbici
Macchina da cucire
Dimensioni sconosciute2
2
Dip in coagulant
Dip in coagulant
Pull the liner onto a porcelain hand form and flame it to smooth off the surface. Dip it in a 10 % solution of acetic acid in acetone, then turn the form for about 2½ minutes at 24 °C until it is dry. The coagulant sets the latex before it can soak through the cloth.
Materiali per questo passaggio:
Acido acetico (glaciale)1 10 % in acetone
Acetone1 solventStrumenti necessari:
Forma per guanti
Cannello a propano3
3
Dip the natural rubber coat
Dip the natural rubber coat
Dip the liner into natural rubber latex (the patent uses LOTOL 1185) and leave it 5 seconds. Draw it out, turn it upside down and let it dry. Scrub the rubber film with an abrasive cleaner, a brush and water, and dry it again.
Materiali per questo passaggio:
Lattice di gomma naturale1 bath
Detergente abrasivo1 as neededStrumenti necessari:
Forma per guanti
Spazzolone4
4
Mix the butyl latex bath
Mix the butyl latex bath
Mix, in parts by dry weight: butyl rubber latex 100, sulphur 3, zinc dibutyldithiocarbamate 4, zinc oxide 5, formaldehyde 0.1 as a preservative, a liquid dithiocarbamate curing accelerator 4 (Merac 255 in the patent), and 6.5 of pigments (olive drab in the patent). Not given: the pigments.
Materiali per questo passaggio:
Lattice di gomma butilica100 parts dry
Zolfo3 parts
Dibutilditiocarbammato di zinco4 parts
Polvere di ossido di zinco5 parts
Soluzione di formaldeide (formalina al 37 %)0.1 parts formaldehyde
Accelerante ditiocarbammato liquido4 parts
Materiale sconosciuto6.5 parts pigmentStrumenti necessari:
Agitatore5
5
Dip five butyl coats
Dip five butyl coats
Dip the glove into the butyl latex and draw it out at 10 cm per minute. At once turn the form at about 8 rpm at 24 °C until the film has gelled, then dry it upside down in an oven at 66 °C for 1 hour. Wash, dip and dry again until there are five butyl coats; do not use the abrasive cleaner on the butyl film.
Strumenti necessari:
Forma per guanti
Essiccatoio6
6
Cure and finish
Cure and finish
Dry the glove at 66 °C for 1 hour. Cure it for 3 hours in a pressure vessel with 30 psi steam in the jacket (131 °C) and 26 psi air in the chamber. Strip the gloves from the forms while hot; when cool, trim them and wash them in soapy water.
Materiali per questo passaggio:
Sapone1 as neededStrumenti necessari:
Autoclave da bancoForbiciMateriali
13- 1 linerSegnaposto
- 1 10 % in acetoneSegnaposto
- 1 solventSegnaposto
- Segnaposto
- 1 as neededSegnaposto
- 100 parts drySegnaposto
- 3 partsSegnaposto
- Segnaposto
- 5 partsSegnaposto
- 0.1 parts formaldehydeSegnaposto
- Segnaposto
- 6.5 parts pigmentSegnaposto
- 1 as neededSegnaposto
Strumenti richiesti
9- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
- Segnaposto
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