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—N=C=O + HOˉ → —NH-COOˉ
.
2
In the 1970s, Germany to Bayer first synthesized PU. In 1950, PU as textile finishing agent in Europe, but mostly for solvent products used in dry coating. In the 1960s, due to the people environmental protection consciousness enhancement and the environmental protection laws and regulations, PU coating system. Since 1970's, PU PU fabric rapid development, has been widely used. Since the 1980s, the research and application of PU technical breakthrough progress appeared. Compared with the foreign and domestic textile finishing agent on PU study later.
performance and abrasion resistance,
temperature flexing fatigue properties. For
aliphatic diisocyanate ultraviolet light resistance,
see part. Other diisocyanate met with, they can
.
5
Terathane can be soft material and general
diisocyanate reaction, global most commonly
diisocyanate as 454 '- ErBenJi methane
diisocyanate (MDI) and toluene diisocyanate
(TDI), (2,4-diflooronitrohenzene, lysine TDI
isomers in various mixing ratio of mixture).
Terathane can also with special diisocyanate
reaction, such as PPDI, in order to improve the
Pu Synthetic Process
• Pu Introduction • Pu Synthetic • Pu Variety Classification Applications
AND Applications
.
1
Pu Iቤተ መጻሕፍቲ ባይዱtroduction
Pu whole called polyethylene carbamate, is contained in the molecular structure of the unit —NHCOO— the unit by highmolecular compounds, and hydroxyl reaction system, reactive is as follows:
be Terathane ? reaction, although with the
reaction rate would be different.
.
6
In the general polyurethane hydrogen donor is amine and alcohols, when the final product, usually use of elastomer chain agent for 2 amine and glycol. Chart 2 shows the various amino and hydroxyl and phenyl isocyanate response speed. Relative velocity can choose by catalyst (see vulcanization time and catalyst).
.
3
Pu Synthetic
Pu by two phase to composition, including soft and hard and soft section is long chain polyols hard segment is by isocyanate and extender chain agent. Polyurethane is by isocyanate and polyols as by Mr Reaction, then with extender chain reaction. Sulfide agent, Sometimes use "one-step" for synthesis of polyurethane to reduce cost and increase the reaction speed. The so-called "one-step" will be polyols, isocyanate and extender chain reaction, step with polyurethane.
.
4
For synthesis of polyurethane, everyone knows that all the ingredients, Dupont company easily absorbing polyether in shipping during drying, manufacturer can effectively use directly. During operation, so often accidental into water to degas. Small sample easily absorb a certain amount of moisture, therefore is synthesized in the lab before any isocyanate reaction should degas. Can be mixed gas off into the air. Below are adopted in the recipe or dry degas.
