Ushirikiano
SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
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.
Juu
Unknown
Maagizo
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.
Vifaa kwa hatua hii:
Kitambaa cha pamba kilichofumwa kwa sindano1 linerZana zinazohitajika:
Mkasi
Cherehani
Vipimo visivyojulikana2
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.
Vifaa kwa hatua hii:
Asidi asetiki (safi kabisa)1 10 % in acetone
Asetoni1 solventZana zinazohitajika:
Kalibu ya glavu
Tochi ya Propani3
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.
Vifaa kwa hatua hii:
Utomvu wa mpira asilia1 bath
Kisafishaji cha kukwaruza1 as neededZana zinazohitajika:
Kalibu ya glavu
Brashi ya kusugua4
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.
Vifaa kwa hatua hii:
Utomvu wa mpira wa butili100 parts dry
Salfa3 parts
Zinki dibutildithiokabamati4 parts
Poda ya oksidi ya zinki5 parts
Myeyusho wa fomaldehidi (fomalini asilimia 37)0.1 parts formaldehyde
Kiharakishi cha dithiokabamati cha majimaji4 parts
Nyenzo isiyojulikana6.5 parts pigmentZana zinazohitajika:
Kikorogo5
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.
Zana zinazohitajika:
Kalibu ya glavu
Tanuri la kukaushia6
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.
Vifaa kwa hatua hii:
Sabuni1 as neededZana zinazohitajika:
Otoklavu ya mezaMkasiVifaa
13- Kishikilia Nafasi
- 1 10 % in acetoneKishikilia Nafasi
- 1 solventKishikilia Nafasi
- 1 bathKishikilia Nafasi
- 1 as neededKishikilia Nafasi
- 100 parts dryKishikilia Nafasi
- 3 partsKishikilia Nafasi
- 4 partsKishikilia Nafasi
- 5 partsKishikilia Nafasi
- 0.1 parts formaldehydeKishikilia Nafasi
- Kishikilia Nafasi
- 6.5 parts pigmentKishikilia Nafasi
- 1 as neededKishikilia Nafasi
Zana Zinazohitajika
9- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Vifaa vya Michoro Iliyounganishwa
Usambazaji 10%
กรีดยางพารา — การเก็บน้ำยางธรรมชาติจากต้นยางพารา
na SomchaiSang
Kilimo
56
0
0
0
1
0
Hatari
Usambazaji 10%
Glacial Acetic Acid from Wood Vinegar: Acetate of Soda, Oil of Vitriol and Freezing
na Charlie
Viwandani
21
0
0
0
1
0
Usambazaji 10%
Acetone by Dry Distillation of Acetate of Lime
na Charlie
Kemia
36
0
0
0
1
0
Usambazaji 10%
Collecting Native Sulfur from Volcanic Deposits
na Peter
Jangwa
99
0
0
0
6
0
Usambazaji 10%
Making Zinc White Pigment — The Non-Toxic Replacement for Lead White
na Charlie
SANAA
70
0
0
0
7
0
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