Water swelling polyurethane elastomer sealing product material and preparation method
A water-swellable, elastic body technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of reduced expansion ratio, low cross-linking density of carrier rubber, loss, etc., and achieve stable water resistance and excellent mechanical properties , the effect of low quality loss
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Embodiment 1
[0032] formula:
[0033] (A) Hydrophilic polyether polymer polyol
[0034] Propylene oxide, ethylene oxide copolyether 100 parts
[0035] (B) Polyisocyanate
[0036] Toluene diisocyanate (TDI) 18.5 parts
[0037] (C) Chain extension cross-linking agent
[0038] 1.4 butanediol 2.1 parts
[0039] 4 parts of dichlorodiaminodiphenylmethane (MOCA)
[0040] Dimethylthiotoluenediamine (DMTDA) 2 parts
[0041] Its preparation method:
[0042] For dehydration of 10kg polyether polymer polyol, vacuum dehydration is carried out at a temperature of 110-120°C until the water content is less than 0.5‰. When cooling to 70°C, add 1.85kg of toluene diisocyanate, control the reaction temperature between 80-85°C, and react for 2 hours under stirring to obtain a prepolymer; take 1000g of the prepolymer at a temperature of 100°C with Chain-extending cross-linking agent butanediol 21g, dichlorodiaminodiphenylmethane 40g, dimethylthiotoluenediamine 20g are mixed by manual pouring method, stirr...
Embodiment 2
[0044] formula:
[0045] (A) Hydrophilic polyether polymer polyol
[0046] Tetrahydrofuran, ethylene oxide copolyether 100 parts
[0047] (B) Polyisocyanate
[0048] 29 parts of diphenylmethane diisocyanate (MDI)
[0049] (C) Chain extension cross-linking agent
[0050] 1.4 butanediol 6 parts
[0051] Trimethylolpropane 1.1 parts
[0052] Its preparation method:
[0053] For the dehydration of 200kg polyether polymer polyol, under the temperature condition of 120-130°C, carry out vacuum dehydration for 1 hour until the water content is less than 0.5‰. When cooling to 60°C, add 58kg of diphenylmethane diisocyanate, control the reaction temperature between 75-80°C, and react under stirring for 2 hours to prepare a prepolymer. Take the prepolymer and transfer it to the prepolymer storage tank of the polyurethane elastomer pouring machine, set the temperature at 100°C; mix 1.4 butanediol and trimethylolpropane in a ratio of 6:1.1 in the crosslinking agent storage tank of th...
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