Tricine (CAS:5704-04-1) is an excellent amphoteric biological good's buffer. CN114180587A patent introduces a preparation method of wear-resistant powder with high transparency. The micro-nano structure is formed through the synergistic formation of micro-scale linear silica and nano-scale spherical silica, which can improve its mechanical properties and friction resistance performance. At the same time, it does not affect the transparency performance. Tricine is used as a pH regulator in the preparation method of the wear-resistant powder. The wear-resistant powder contains 5 components. The specific preparation methods are as follows:

Component 1: Take 0.5-2g of polyvinylpyrrolidone with a molecular weight of 40000-1300000 and disperse it with 5-20mL of alcohol. The dispersion method is 28-40KHz ultrasonic dispersion for 1-3h; add 10-20mL of ethanol and 3-5mL of water and continue stirring, the speed is 300-500r/min, and the component 1 is obtained after 1-2h.

Component 2: A sodium citrate aqueous solution with a concentration of 0.1-0.2M is prepared; 0.5-1 mL of the prepared sodium citrate aqueous solution is added dropwise to 5-10 mL of component 1, and component 2 is obtained after shaking evenly.

Component 3: Add 2-3 mL of ammonia water with a mass concentration of 20%-25% to component 2, then add 1-2 mL of ethyl orthosilicate, shake evenly, and let stand at 80-90 ° C for reaction 15 -25min; filter, wash with water and alcohol to obtain component 3 in powder state.

Component 4: Add 0.05-0.3g of dopamine hydrochloride to component 4, stir at 300-500r/min, adjust pH to 7.8-8.8 with a pH adjuster (Tricine or Tris), and then react at 30-60°C for 5 -30min, component 4 is obtained.

Component 5: Continue to add 0.5-1.5 mL of ethyl orthosilicate, and react at room temperature for 6-24 hours; after filtration, wash with water and then with alcohol to obtain component 5, which is a wear-resistant powder with high transparency.

Beneficial effects of the present invention:

After the high-transparency wear-resistant powder prepared by the invention is added to the polyurethane film layer as an additive, its mechanical properties, friction resistance properties and hardness are greatly improved on the premise of not affecting the transmittance, and can be applied to high-transparency, high wear-resistant materials.

References

CN114180587A A preparation method of wear-resistant powder with high transparency.