A kind of silicone rubber impression material of one impression and preparation method thereof
An impression material and silicone rubber technology, applied in the field of medical materials, can solve the problems of high cost, reduced diagnosis and treatment efficiency, and high market price, and can increase tensile strength and tear strength, select reasonable ratios, and improve performance. Effect
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[0047] The preparation method of above-mentioned modified starch preferably comprises the following steps:
[0048] (1) Coupling reaction: amylose and deionized water according to the mass ratio (1‐5): 10 (such as 1:10, 1.5:10, 2:10, 3:10, 4:10, 5:10) Any value or any range between the two) mixed to obtain a mixture of the two; then add an excess of alkaline solution to the mixture to a Ph value of 14, and raise the temperature to 60-80°C (such as 60°C, 65°C , 70°C, 75°C, 80°C any value or any range between them), and nitrogen gas is introduced to form an alkalization reaction system; , 75°C, 80°C, any value or any range between the two) add a coupling agent to the alkalization reaction system for coupling reaction, and the reaction time is 4-6h (for example, 4h, 4.5h, 5h, 5.5h , any value in 6h or any range between the two) to obtain a coupling reaction product; the coupling agent is preferably allyl glycidyl ether.
[0049] (2) Neutralization reaction step: add an acidic s...
Embodiment 1
[0070] The total raw material of the impression material in this embodiment is 207.71g, including:
[0071]
[0072] Among them, the above-mentioned three kinds of vinyl silicone oils with different viscosities are all vinyl polysiloxanes with a mass percentage of vinyl in the molecule of 0.1 wt%; the above-mentioned hydrogen-containing silicone oil has a mass percentage of hydrogen in the molecule of 0.8 wt%; The above-mentioned Pt-containing catalyst uses tetramethyldivinyldisiloxane as a solvent and Pt(0) with tetramethyldivinyldisiloxane as a ligand, and the content of Pt in the catalyst is 3000ppm; The particle size of the high-strength quartz powder is 6.5 μm; the mass percentage of the vinyl group in the molecule of the vinyl MQ resin is 1.7 wt%.
[0073] The preparation method of the impression material of the present embodiment comprises the following steps:
[0074] (1) Weigh the base mixture and the catalyst mixture respectively according to the amounts in the f...
Embodiment 2
[0137] The raw material of the impression material in this embodiment is 207.71g in total, and the ratio of the raw materials is basically the same as in Example 1, the difference being that a mixture of hydrogenated castor oil and fumed silica (unmodified) is used as the thixotropic agent, wherein hydrogenated Castor oil 3g, fumed white carbon black 3g.
[0138] The preparation method operation and parameters of the present embodiment are similar to those of Example 1, the difference is: in step (1), in the matrix mixture, 1.5 g of hydrogenated castor oil, 1.5 g of fumed silica (as a thixotropic agent), in the catalytic mixture , hydrogenated castor oil 1.5g, fumed silica 1.5g (as a thixotropic agent).
[0139] The test result is:
[0140] The curing time of the impression material is 3.5 minutes, the elastic recovery rate is 99.8%, the impression accuracy reaches 0.1%, and the tear strength is 20kN / m.
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