Gw Series Rebar Bending Machine , reasonable design, simple structure and can bend steel rod diameter to any required shape applying to bridge, tunnel and small, medium as well as large construction projects.
1.Simple operation, safe and durable, high quality copper wire motor, guarantee a more stable performance.
2.Enclosed gearbox lubrication, worm gear and worm drive, with speed adjustable gear, strong bending strength, not rebound.
3.Ultra-high hardness accessories, adjustable baffle which guarantee a longer service life.
4.Machine surface adopts plastic-spray treatment, disc, long strips are solid and forged, chrome plated, beautiful and generous.
We can customize GW65 Rebar Bending Machine according to customer's requirement.
GW Series Rebar Bending Machine Gw Series Rebar Bending Machine,Deformed Rebar Rod Bending Machine,Used Rebar Bending Machine,Steel Bar Bending Machine BAODING JINDI MACHINERY CO., LTD , https://www.rebarconnector.com
Like other polymer materials, polyurethane foams will age under the influence of external factors such as light and heat, and yellowing will occur, and the physical properties of the materials will decrease. Adding antioxidants, ultraviolet light absorbers and other antioxidants will delay this effect.
The addition of a trace amount of an antioxidant to the polyurethane raw material or formulation can block the thermal oxidation of the polyurethane. The role of the antioxidant is to prevent the oxygen chain-induced polymer chain scission reaction and decomposition of hydrogen peroxide.
Hindered phenolic compounds are the most commonly used antioxidants for polyurethane materials. For example: 1,3,5-trimethyl-2,4,6-tris(3',5'-di-tert-butyl)-4-hydroxybenzylbenzene, 2-(2'-hydroxy-3'- Tert-alkylbenzyl)anisole, tetrakis[L-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoic acid] pentaerythritol ester (antioxidant 1010), Lu (3,5-di-uncle Butyl butyl 4-hydroxyphenyl) propionate (antioxidant 1076), 2,6-di-tert-butyl-4-methylphenol (antioxidant 264), and the like. Phosphite antioxidants are also commonly used, such as tris(2,4-di-tert-butylphenyl) phosphite.
The aromatic isocyanate raw materials such as diphenylmethane diisocyanate are affected by light, heat, oxygen and moisture during storage and use, and the color will turn yellow, and chemical reaction will occur to form some infusibles to make isocyanate content. decline. The addition of antioxidants and antioxidants such as triphenyl phosphinate, tridecyl phenylphosphinate, and tris(2,4-di-tert-butylphenyl) phosphite can reduce this phenomenon. The use of a phosphonate in combination with a substituted phenol improves the weatherability and UV resistance of the polyurethane. The above phosphonate antioxidant is also often used in combination with the antioxidant 2246 and the antioxidant 300 [4,4'-thiobis(6-tert-butyl)-3-cresol].