36results about How to "Improve double bond conversion rate" patented technology

The present invention discloses a methacrylate macromonomer containing a fluorine structure but not containing a bisphenol A structure, preparation method therefor and application thereof. The prepared methacrylate macromonomer containing fluorine structure not containing bisphenol A structure can be used as an organic monomer component of a dental restorative material. The macromonomer has the advantages of large molecular weight, large molecular volume, not containing a bisphenol A structure and containing a fluorine structure. Therefore, when the macromonomer is polymerized, the polymerization volume shrinkage is small and a polymerization product has a good mechanical property.

The invention relates to an ultraviolet-curing black adhesive and a preparation method of same. The UV-curing black adhesive is mainly prepared from the following raw materials: modified polyurethane acrylate, an active monomer, matt powder, carbon black, a photoinitiator and a thermo-initiator. The active monomer includes at least two selected from isobornyl acrylate, tetrahydrofuran acrylate, cyclic trimethylolpropane methylal acrylate, tricyclodecane dimethanol diacrylate, tri(2-hydroethyl)isocyanurate triacrylate. The modified polyurethane acrylate is mainly prepared from a mixture of polyether glycol and mercaptan, diisocyanate, hydroxyl-functionalized acrylate, a catalyst and a polymerization inhibitor. The diisocyanate is a composition composed of isophorone diisocyanate and toluene diisocyanate. The UV-curing black adhesive can satisfy the adhesion force demand of curing a thick coating, and is free of any undesirable phenomenon, such as oil dirt, for more than 300 h in a double-85 test.

The invention relates to a photochromic composition of hyperbranched urethane acrylate, a preparation method and application thereof. The photochromic composition comprises: polyvalent mercaptan; unsaturated polyol; acrylate isocyanate; initiator; polymerization inhibitor Agents; Photochromic Dyes; Antioxidants; UV Absorbers; Light Stabilizers; Leveling Agents; Defoamers. The method adopts the reaction of polyvalent mercaptan and unsaturated polyol to generate hyperbranched polyol, photoinitiator initiates polymerization, and then capping with acrylate isocyanate to obtain multifunctional hyperbranched urethane acrylate containing thioether structure, and finally adding other The auxiliary agent and the photochromic dye are the photochromic composition. The photochromic film prepared from the composition by electron beam radiation curing not only has good photochromic effect, but also has high fastness and hardness, outstanding toughness and excellent wear resistance, chemical resistance and chemical resistance. Aging resistance.

The invention discloses a 3D printing light-curing material and its underwater curing post-treatment process. The main components of the light-curing material are calculated by weight percentage, consisting of 20-50% of UV-curable nano-organic-inorganic silicon hybrid resin, 5-25% of UV-curable self-repairing resin, 0.5-20% of fluorine-modified resin, and 10% of monomer diluent ~40%, photoinitiator 0.1~5%, pigment 0.1~1%, filler 0.1‑5%, auxiliary agent 0.1~3%. The 3D printing light-curing material of the present invention is first cured and formed by a 3D printing DLP device with ultraviolet light UVA 385nm band, and then undergoes an underwater curing post-treatment process. The tensile strength of the 3D printing light-cured material obtained by the process of the present invention is 68-80Mpa, the bending strength is 53-61Mpa, the scratch resistance is good, the fine scratches can be quickly repaired without leaving traces, and the surface finish level is ▽10- ▽11, the dimensional change is within 0.10mm under long-term storage, and the light aging resistance is up to 300h.

The invention provides a preparation method of a dental composite resin material and a product thereof, the method comprising: (1), weighing raw materials, the raw materials comprising: resin monomers, fillers, photocuring initiators, thermal curing initiator; (2), mixing the weighed raw materials to obtain a composite resin precursor; (3), subjecting the composite resin precursor to thermal curing treatment to obtain a pre-cured composite resin material, wherein the thermal curing temperature 100-200°C, the thermal curing time is 0.5-3h, and the thermal curing pressure is 1-250MPa; (4), the composite resin precursor after the thermal curing treatment is subjected to photocuring treatment to obtain a dental composite resin material, Among them, the light intensity of light curing is 800‑2000mW / cm 2 , the light curing time is 20-300s. The application of the invention can improve the double bond conversion rate of the composite resin material.

The invention discloses a trtiary amine structure containing methacrylate macromonomer without bisphenol A structure, a preparation method and an application thereof. The trtiary amine structure containing methacrylate macromonomer without the bisphenol A structure can be used as an organic monomer component of a dental prosthetic material. The macromonomer has large molecular weight and large molecular volume, contains the tertiary amine structure, but contains no bisphenol A structure. Therefore, the macromonomer can be used as a coinitiator for light initiated polymerization. In addition, the macromonomer has low polymerization volume shrinkage during the polymerization process, and a polymerization product has good mechanical properties.