Polyurethane shear spring processing method
A shear spring and processing method technology, applied in the field of device accessories in the field of bridges, can solve the problems of poor aging resistance and low temperature performance, uneven mixing of rubber mixing colloids, and unstable product quality, and achieve good aging resistance. , the effect of reducing 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 -NCO group 15%, 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, the mu...
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% of -NCO groups, the viscosity of the prepolymer is 420mpa s; the isocyanate in it 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 mult...
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 18% of -NCO groups, 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; wherein the chain-extending cross-linking agent is 1,4-butanediol; in this step, a multi-leaf dispersing mixing mixer is used for stirring, such as figure 2 As sh...
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Abstract
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