Polyurethane shear spring processing method
A technology of shear spring and processing method, which is applied in the field of device accessories in the bridge field, can solve the problems of poor aging resistance and low temperature performance, uneven mixing of rubber mixing colloids, unstable product quality, etc., and achieve good aging resistance , reduced residual deformation, and good low-temperature performance
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Embodiment 1
[0025] The preparation method of the polyurethane shear spring of the present embodiment may further comprise the steps:
[0026] a, polyol dehydration: dehydrate the polyol to make it contain 0.05% water; the polyol is polytetramethylene glycol;
[0027] b. Preparation of prepolymer: react the dehydrated polyol prepared in a with excess isocyanate to generate prepolymer A containing 15% of -NCO groups, the viscosity of the prepolymer is 450mpa.s; the isocyanate is toluene di isocyanate;
[0028] c. Prepare the mixture: fully stir the polyol and auxiliary agent prepared in a to obtain a uniformly mixed mixture B. The auxiliary agent includes a chain extension crosslinking agent, a catalyst and a pigment. The viscosity of the obtained mixture B is 260mpa at the processing temperature .s; the chain-extending cross-linking agent is 3,3'-dichloro-4,4-'diaminodiphenylmethane. In this step, a multi-blade dispersion mixing mixer is used for stirring, such as figure 2 As shown, th...
Embodiment 2
[0034] The preparation method of the polyurethane shear spring of the present embodiment may further comprise the steps:
[0035] a, polyol dehydration: dehydrate the polyol to make it contain 0.04% water; the polyol is polytetramethylene glycol;
[0036] b. Preparation of prepolymer: react the dehydrated polyol prepared in a with excess isocyanate to generate prepolymer A containing 20% -NCO group, the viscosity of the prepolymer is 420mpa.s; the isocyanate is 4' 4-Diphenylmethane diisocyanate;
[0037] c. Prepare the mixture: fully stir the polyol and auxiliary agent prepared in a to obtain a uniformly mixed mixture B. The auxiliary agent includes a chain extension crosslinking agent, a catalyst and a pigment. The viscosity of the obtained mixture B is 250mpa at the processing temperature .s; the chain-extending cross-linking agent is 1,4-butanediol. In this step, a multi-blade dispersion mixing mixer is used for stirring, such as figure 2 As shown, the multi-blade dis...
Embodiment 3
[0043] The preparation method of the polyurethane shear spring of the present embodiment may further comprise the steps:
[0044] a, polyol dehydration: dehydrate the polyol to make it contain 0.03% water; the polyol is polyethylene adipate;
[0045] b. Preparation of prepolymer: react the dehydrated polyol prepared in a with excess isocyanate to generate prepolymer A containing -NCO group 18%, the viscosity of the prepolymer is 600mpa.s; the isocyanate is 1, 5-naphthalene diisocyanate or p-phenylene diisocyanate;
[0046] c. Prepare the mixture: fully stir the polyol and auxiliary agent prepared in a to obtain a uniformly mixed mixture B. The auxiliary agent includes a chain extension crosslinking agent, a catalyst and a pigment. The viscosity of the obtained mixture B at the processing temperature is 180mpa .s; the chain-extending cross-linking agent is 1,4-butanediol;
[0047] In this step, a multi-blade dispersion mixing mixer is used for stirring, such as figure 2 As sh...
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