Polyurethane elastomer composition for concrete caulking and preparation method thereof
A polyurethane elastomer and composition technology, applied in the field of polyurethane elastomer, can solve the problems of excessive surface drying time, insufficient adhesive force between elastomer and concrete, easy foaming, etc., and achieve scientific and reasonable preparation method and high adhesion Sex, low viscosity effect
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Embodiment 1
[0041] Component A: 35% polyether polyol (NJ6209) with a number average molecular weight of 600, 30% polyether polyol (PPG125) with a number average molecular weight of 375, DMC32.2%, anti-aging agent (UV-76) 0.5%, Anti-aging agent (UV-39) 0.5%, anti-aging agent (UV-21) 0.3%, coupling agent (KH560) 1%, catalyst (CAT-18) 0.5%, at 100 ° C, dehydration below -0.095MPa to Moisture content 0.05%, obtain polymer A component;
[0042] Component B: polyether polyol 330NG20%, dehydrated to 0.04% moisture below -0.095MPa at 100°C, cooled to 60°C, added 50% liquefied MDI, 30% butyl acetate and heated at 80°C Stir for 3 hours to react. When the final isocyanate content is 20%, the reaction is completed and sealed;
[0043] Components A and B were mixed and reacted at a mass ratio of 100:100, the mixing temperature was 25°C, poured into a normal temperature abrasive, the gel time was 10 minutes, and the surface drying time was 30 minutes to obtain a 60D elastomer product.
Embodiment 2
[0045] Component A: 20% of polyether polyol (NJ6209) with number average molecular weight of 600, 22% of polyether polyol (PPG125) with number average molecular weight of 375, 30% of PPG1000, DMC22%, anti-aging agent (UV-76) 0.5 %, anti-aging agent (UV-39) 0.5%, anti-aging agent (UV-21) 0.3%, coupling agent (KH550) 4%, catalyst (CAT-18) 0.7%, at 105°C, -0.095MPa or less Dehydration to 0.04% moisture to obtain polymer A component;
[0046] Component B: polyether polyol 330NG15%, dehydrated at 100°C, below -0.095MPa to 0.03% moisture, cooled down to 60°C, added liquefied MDI 60%, cyclohexanone 25%, kept the temperature and heated at 85°C Stir for 3 hours to react. When the final isocyanate content is 28%, the reaction is completed and sealed.
[0047] Components A and B were mixed and reacted at a mass ratio of 100:60, the mixing temperature was 25°C, poured into a normal temperature abrasive mold, the gel time was 5 minutes, and the surface drying time was 36 minutes to prepar...
Embodiment 3
[0049] Component A: 25% of polyether polyol (NJ6209) with number average molecular weight of 600, 15% of polyether polyol (PPG125) with number average molecular weight of 375, 35% of PPG305, DMC21.5%, anti-aging agent (1010) 0.6 %, anti-aging agent (UV-9) 0.5%, coupling agent (KH560) 1.9%, catalyst organotin 0.5%, at 105°C, dehydrated to 0.04% moisture below -0.095MPa to obtain polymer A component;
[0050] Component B: polyether polyol DL-4000D 20%, dehydrated at 100°C, below -0.095MPa to 0.02% moisture, cooled to 60°C, added MDI-100 60%, butyl acetate 20% to keep the temperature at 82 The mixture was heated and stirred at ℃ for 2 hours to react, and when the final isocyanate content was 26%, the reaction was completed and sealed.
[0051] Components A and B were mixed and reacted at a mass ratio of 100:80, the mixing temperature was 25°C, poured into a normal temperature mold, the gel time was 10.5 minutes, and the surface drying time was 25 minutes to obtain a 72D elastomer...
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