A kind of reactive antistatic polyurethane elastomer containing epoxy nano fluid and its preparation method
A technology of polyurethane elastomer and hydroxyl epoxy nanometer, which is applied in the field of polymer material preparation, to achieve the effect of high tensile strength, simple synthesis process, and broaden the practical application
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Embodiment 1
[0040](1) Preparation of reactive polyurethane elastomer prepolymer: Because the polyurethane reaction needs to strictly control the moisture content, before the reaction, the solvent N,N-dimethylformamide used in the reaction is dried with molecular sieves for one week, and the molecular sieves are heated in a high-temperature furnace. Pre-treatment at 400°C for 4 hours. In order to remove the moisture of polyurethane synthetic monomer ethers, dry them at 120°C for 2 hours before the reaction, then weigh 10.0g of PTMEG and 5.0g of diphenylmethane diisocyanate MDI, add 100ml of N,N-dimethyl formamide in a 250mL three-neck flask. At 90°C, under nitrogen protection, with mechanical stirring at a rate of 300 rpm, the reaction was carried out under condensing reflux for 3 h. After the reaction, it was naturally cooled to room temperature. .
[0041] (2) Preparation steps of reactive polyurethane elastomer: on the basis of (1), weigh 0.56g of ethylene glycol, dissolve it with 20...
Embodiment 2
[0047] A preparation method of a reactive antistatic polyurethane elastomer containing epoxy-type nano fluids, comprising the steps of:
[0048] (1) Preparation of epoxy nano fluid: First, weigh 2.000 g of aqueous silica solution, add 40 ml of pure water and ultrasonically disperse for 30 minutes. Then calculate the quality of the silane modifier according to the ratio of silicon dioxide and organic chain mass ratio of 0.15:0.85, weigh 0.794g gamma-glycidyl etheroxypropyl trimethoxysilane modifier, dissolve it with 50ml ethanol and add it to In the ultrasonically dispersed silicon dioxide aqueous solution, the reaction was carried out at 70° C. under the protection of nitrogen for 24 hours. Then weigh 0.190g of tri-n-butylamine and 0.370g of concentrated hydrochloric acid according to the molar ratio of silane modifier to tri-n-butylamine and concentrated hydrochloric acid 1:1:1, add them to the solvent after the above reaction, and continue the reaction at 70°C for 24h . Th...
Embodiment 3
[0054] A preparation method of a reactive antistatic polyurethane elastomer containing epoxy-type nano-fluids:
[0055] (1) is the same as (1) in Example 2.
[0056] (2) is the same as (2) in Example 2.
[0057] (3) Same as (3) in Example 2, the difference is that 0.66g (4wt.%) of epoxy nano fluid added is dissolved with 20ml of N,N-dimethylformamide, and added to the pre-cooled polymer.
[0058] (4) is the same as (3) in Example 1.
[0059] The polyurethane elastomer film prepared in this example is a pure film containing 4wt.% epoxy nano-fluid, and its tensile strength is 30.7 MPa, reaching the maximum value, and its performance is better than other similar systems. The elongation at break is 625%, and the Shore hardness is 79.1, such as figure 1 shown. The surface resistivity is 4.34×10 11 Ω / sq, as shown in Table 1, compared with Example 2, the surface resistance is reduced by an order of magnitude.
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