substance maintain latex (5)
When the farmers cut the rubber White or cream that fluid flow from the rubber latex (called Field latex) latex is suspended because of the rubber particles suspended in
Most elements of the latex is water, which is approximately 50-80 and rubber were 20-45 makes latex is not suitable to be converted into products And do not like transport in the form of rubber latex Because consume the freight60 before the production or transportation
In general, latex from rubber trees will remain out of latex, no more than 3-6 hours Because the bacteria in the air And from the bark of the tree will go down in rubber latex And eat nutrients in latex, such as protein, sugar, etc.But what happened from digested bacteria is a type of gas, such as carbon dioxide, methane and volatile fatty acid (volatile Fatty acid) when the amount of volatile acid in latex increased Latex to loss conditionThe viscosity is increased because of rubber particles begin to catch a gritty , and then expanded into larger, until the loss of latex spoiled rotten and stinkThe environment stability of latex rubber clones, etc.To prevent loss of state of latex The need to add some chemicals down to retain the latex to maintain the liquid The chemicals used in the preservation of latex called substance maintain latex (Preservative) such as ammonia (ammonia)(sodium sulfite), formaldehyde (formaldehyde) etc. in this article have discussed the use of ammonia only single species Because it is a chemical commonly used chemicals and is near the
Ammonia (NH3) is a kind of chemicals that are effective in treating the latex And the used today In general, the use of ammonia to maintain rubber is used in 0.3-0 percent8 by weight of the rubber Consumption based on the period of storage And the condition of latex used as
highlights of using ammonium have several items as follows:
1Ammonia is a treasure to inhibit the growth of bacteria
2. Ammonium treasure is spotted, thus helping supplement suspended state waters Yang
3. Ammonium do not cause color in natural rubber latex
Weak point of using ammonia is
1Ammonia is a volatile compounds (boiling point substances about - 33 C) and a pungent smell worse when volatile into the atmosphere In addition to cause pollution in the environment but also affect odor directlyBecause of the volatile ammonia ammonium has changed throughout the result of constant water rubber บัติไม่
2. Ammonium compounds with antibacterial activity is not high, we must use a large quantity In order to be able to inhibit the growth of bacteria 3 complete
Ammonium has corrosive metal This occurs when the ammonia evaporation from the latex floating contact with metals Or when the latex treated condition by ammonia in contact with metals
From the point of various ammonia, the development of chemicals. Up to replace, or with ammonia to reduce the effects of the weak point of ammoniaSubstance, tetramethylthiuram disulphideTMTD with zinc oxide of both types of chemicals used It can reduce the consumption of ammonia into 0.2-0.5% by weight
However, other types of chemical treatment of commonly used with ammonia have weaknesses as well As of zinc oxide will destroy the stability of the latex The rubber particles capture easier While the use of the MTS good will cause substanceWhich is carcinogenic and cause of color in the rubber Consequently, the research And development to find to help maintain the latex new type efficient and cheap always
the use of synthetic resin for environment, or for coating materials (20)
properties environment or the skin material, synthetic resin, oil
AL thought, vinyl, epoxy, phenolic, synthetic rubber, polyurethane
. WoodConcrete interior decoration metal
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- External rural seaside
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Industrial Zone G NR VG
G G G F
NR VG VG G
VG E E G
VG VG G G
, VG E
G NG VG G
G VG VG NG
VG G G G
VG VG G G
G G G VG
VG G NR VG
G G G VG
Table 2.1 show Properties using resin to the skin material
Key: (9), E ExcellentOutstanding excellent
VG Very good good
G Good or average good
F Fair medium, good enough to use
P Poor bad NR Not recommend Not recommended
timber furniture, choose scent colour (3)
Rubber, as cash crops Has been exported to foreign consumers largest trees The rubber growers will encounter problems rubber prices down While the products made from rubber back production increased every yearApplication of rubber processing A solution to help farmers can sell raw rubber prices increase
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