Method for manufacturing polyurethane microporous automotive buffer block
A manufacturing method and buffer block technology are applied in the manufacturing field of polyurethane microporous automobile buffer blocks, which can solve the problems of high dynamic fatigue deformation rate, affecting the service life of products, poor comprehensive mechanical properties, etc., so as to improve dynamic fatigue resistance performance, improve The effect of elasticity, improved dynamic fatigue resistance and comprehensive mechanical properties
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Embodiment 1
[0019] Add 500 g of polytetrahydrofuran polyols by parts 3000 in a 2 liter reactor, add 25 g of glass micropowder after processing, 2 g of n-butyl titanate, 40 g of sodium dimethyl sulfonate isophthalate, and raise the temperature of the material to 80° C., under the protection of nitrogen, an excess of 4,4-diphenylmethane diisocyanate was added, and the temperature was maintained for 2 hours to obtain a prepolymer with an —NCO content of 7.2%.
[0020] The auxiliary agent in the chain extender component accounts for 10% of the total amount of the chain extender, and the ratio of the prepolymer to the chain extender component is 100:8.8. Use a low-pressure foaming machine to inject the mixture of prepolymer and chain extender components into a mold at 90°C, pre-cure in an oven at 90°C for 5 hours, demould, and then put it in an oven at 100°C for 15 hours to obtain products.
Embodiment 2
[0022] Add 500 g of polytetrahydrofuran polyols by parts 4000 in a 2-liter reactor, add 15 g of treated glass micropowder, 2 g of n-butyl titanate, and 40 g of sodium dimethyl sulfonate isophthalate. to 90° C., under the protection of nitrogen, an excess of 4,4-diphenylmethane diisocyanate was added, and the temperature was maintained for 4 hours to obtain a prepolymer with an —NCO content of 7.2%.
[0023] The auxiliary agent in the chain extender component accounts for 10% of the total amount of the chain extender, and the ratio of the prepolymer to the chain extender component is 100:10. Use a low-pressure foaming machine to inject the mixture of prepolymer and chain extender components into a mold at 90°C, pre-cure in an oven at 90°C for 3 hours, then release the mold, and then put it in an oven at 100°C for 12 hours to obtain products.
Embodiment 3
[0025] Add 500 g of polytetrahydrofuran polyols by parts 6000 in a 2-liter reactor, add 20 g of treated glass micropowder, 2 g of n-butyl titanate, and 45 g of sodium dimethyl sulfonate isophthalate. To 85° C., under the protection of nitrogen, an excess of 4,4-diphenylmethane diisocyanate was added, and the temperature was maintained for 3 hours to obtain a prepolymer with an -NCO content of 7.2%.
[0026] The auxiliary agent in the chain extender component accounts for 10% of the total amount of the chain extender, and the ratio of the prepolymer to the chain extender component is 100:12. Use a low-pressure foaming machine to inject the mixture of prepolymer and chain extender components into a mold at 90°C, pre-cure in an oven at 90°C for 5 hours, then release the mold, and then put it in an oven at 110°C for 15 hours to obtain products.
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