The Oxidative Softening of Synthetic Rubber Latex

1958 ◽  
Vol 31 (2) ◽  
pp. 262-277 ◽  
Author(s):  
P. Herte
Keyword(s):  
Rubber Latex ◽  
Rubber Industry ◽  
Synthetic Rubber ◽  
Reaction Tube ◽  
Gage Pressure ◽  
Alkyl Phenols ◽  
Softening Process

Abstract A method is described for plasticizing Buna S3 when still as a latex. A plasticization of Buna S3 to the Buna S4 stage is carried out in the presence of metal sols or alkyl phenols, and through use of air or oxygen-enriched air. Softening takes place under low gage pressure, at temperatures around 100° C, and at rates that are technically feasible. In contrast to Buna S4 that has been produced soft by means of polymerization control, the Buna S4 obtained through this softening process has certain advantages, e.g., higher elasticity values in heavily-loaded compounds. So-called recovery can be retarded by careful dosing with phenyl-2-napththylamine. The introduction of this process into the synthetic rubber industry, using continuous latex breakdown in a countercurrent reaction tube, is discussed.

scholarly journals Alternative of bone china and porcelain as ceramic hand molds for rubber latex glove films formation via dipping process

2020 ◽  
Vol 59 (1) ◽  
pp. 523-537
Author(s):  
Chaturaphat Tharasana ◽  
Aniruj Wongaunjai ◽  
Puwitoo Sornsanee ◽  
Vichasharn Jitprarop ◽  
Nuchnapa Tangboriboon
Keyword(s):  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Mold Surface ◽  
Rubber Latex ◽  
Latex Glove ◽  
Bone China ◽  
Synthetic Rubber ◽  
Natural And Synthetic

AbstractIn general, the main compositions of porcelain and bone china composed of 54-65%wt silica (SiO2), 23-34% wt alumina (Al2O3) and 0.2-0.7%wt calcium oxide (CaO) suitable for preparation high quality ceramic products such as soft-hard porcelain products for teeth and bones, bioceramics, IC substrate and magneto-optoelectroceramics. The quality of ceramic hand mold is depended on raw material and its properties (pH, ionic strength, solid-liquid surface tension, particle size distribution, specific surface area, porosity, density, microstructure, weight ratio between solid and water, drying time, and firing temperatures). The suitable firing conditions for porcelain and bone china hand-mold preparation were firing at 1270°C for 10 h which resulted in superior working molds for making latex films from natural and synthetic rubber. The obtained fired porcelain hand molds at 1270°C for 10 h provided good chemical durability (10%NaOH, 5%HCl and 10%wtNaCl), low thermal expansion coefficient (5.8570 × 10−6 (°C−1)), good compressive (179.40 MPa) and good flexural strength (86 MPa). While thermal expansion coefficient, compressive and flexural strength of obtained fired bone china hand molds are equal to 6.9230 × 10−6 (°C−1), 128.40 and 73.70 MPa, respectively, good acid-base-salt resistance, a smooth mold surface, and easy hand mold fabrication. Both obtained porcelain and bone china hand molds are a low production cost, making them suitable for natural and synthetic rubber latex glove formation.

Synthetic rubber latex

1946 ◽  
Vol 241 (4) ◽  
pp. 309-310
Author(s):  
R.H.O.
Keyword(s):  
Rubber Latex ◽  
Synthetic Rubber

Leukemia and cumulative exposure to butadiene, styrene and benzene among workers in the synthetic rubber industry

Toxicology ◽  
1996 ◽  
Vol 113 (1-3) ◽  
pp. 190-202 ◽  
Author(s):  
Maurizio Macaluso ◽  
Rodney Larson ◽  
Elizabeth Delzell ◽  
Nalini Sathiakumar ◽  
Mary Hovinga ◽  
...  
Keyword(s):  
Cumulative Exposure ◽  
Rubber Industry ◽  
Synthetic Rubber ◽  
Butadiene Styrene
Sign in / Sign up

Export Citation Format

Share Document