49results about How to "Increased biodegradation rate" patented technology

This invention provides a polyvinyl alcohol / polylactic acid branch copolymer prepared directly from lactic acid and polyvinyl alcohol or from end-capped polylactic acid and polyvinyl alcohol. The copolymer has a glass transition temperature of 51~65 deg. C, a melting point of 104~165 deg. C and a molecular weight of 10000~600000. This invention also provides the blend of polyvinyl alcohol / polylactic acid copolymer and starch, its application and the method to prepare polyvinyl alcohol / polylactic acid copolymer. As the glass transition temperature and the melting point of the copolymer are of great difference, the copolymer can be used as a kind of completely biodegradable thermoplastics, which expands the application of polylactic acid. Addition of starch not only greatly lowers the cost but also accelerates the biodegradation of the copolymer. The blend of polyvinyl alcohol / polylactic acid copolymer and starch also performs good mechanical properties and can be especially made into membranes by direct blow molding.

The invention relates to a high-temperature biologically-soluble ceramic fiber and a preparation method thereof. According to a technical scheme, the method comprises the following steps of: uniformly mixing 10-30 percent by weight of wollastonite powder or 15-40 percent by weight of dolomite powder, 10-30 percent by weight of talc powder or 8-30 percent by weight of forsterite powder, 40-70 percent by weight of quartz sand powder and 5-20 percent by weight of industrial sodium carbonate serving as raw materials; putting a mixture into a furnace, heating to 1,450-1,700 DEG C, melting, forming a fiber by blowing with compressed air of 0.2-0.5 MPa or forming a fiber by directly performing thread throwing to obtain calcium-magnesium-silicon ceramic cellucotton, putting into nitric acid or hydrochloric acid of which the concentration is 0.5-3 mol / L, heating to 70-90 DEG C, preserving heat for 3-5 hours, and washing with water till the pH value of water washing waste water is 6-7; and thermally treating under a nitrogen atmosphere at the temperature of 800-1,050 DEG C for 2-6 hours to obtain the high-temperature biologically-soluble ceramic fiber. The high-temperature biologically-soluble ceramic fiber has the characteristics of low melting temperature, easiness for operating a fiber forming process, low production cost and the like; and a product has high using temperature and high biological degradation rate.

The invention discloses a polyhydroxy alkanoates graft polymer and a preparation method thereof; the polyhydroxy alkanoates graft polymer is prepared by the following ingredients by weight parts: 100 parts of polyhydroxy alkanoates, 01-15 parts of grafting monomer, 0-5 parts of initiator and 0-5 parts of antioxidants. The polyhydroxy alkanoates graft polymer changes the molecular structure of the polyhydroxy alkanoates, improves the heat stability thereof and further quickens the biological degrading ratio; in addition, the compatibility of the polyhydroxy alkanoates graft polymer and inorganic filling materials, such as CaCO3, talcum powder and the like and the polarity blending material is improved, and the polyhydroxy alkanoates graft polymer has high practical and economical values.

The invention discloses a PLGA and polydioxanone compound fiber, a preparation method, an application and a surgical suture. In the compound fiber, the PLGA fiber is a core layer of the compound fiber, and the polydioxanone is a surface layer of the compound fiber. The preparation method comprises the following steps: respectively obtaining slices of PLGA and slices of polydioxanone; carrying outcompound spinning on the slices of PLGA and the slices of polydioxanone, so that the PLGA is in the core layer of the compound fiber, and the polydioxanone wraps the PLGA to form the surface layer ofthe compound fiber to obtain the PLGA and polydioxanone compound fiber. The compound fiber can be used for the surgical suture. The surgical suture is prepared from the compound fiber. The tensile strength of the compound fiber ranges from 4.6 CN / dtex-5.0 CN / dtex, the elongation at break is 30%-40%, the requirements of surgical sutures can be met, and meanwhile, the cost is low.

Disclosed are polylactide and polydioxanone composite fiber, its preparation method, application and surgical suture. In the composite fiber, the polylactide fiber is the core layer of the composite fiber, and polydioxanone is the skin layer of the composite fiber. The preparation method comprises: obtaining polylactide slices and polydioxanone slices respectively; performing composite spinning on the polylactide slices and polydioxanone slices, so that the polylactide is in the composite fiber The core layer, and the polydioxanone wraps the polylactide to form the skin layer of the composite fiber, and obtains the composite fiber of polylactide and polyglycolide. The composite fiber can be used for surgical sutures. The surgical suture is prepared via the composite fiber. The value range of the tensile strength of the composite fiber is 4.0CN / dtex-5.2CN / dtex, and the value range of the elongation at break is 20%-30%, which can meet the requirements of surgical sutures and is low in cost.

The invention discloses a poly lactate geycollic acid and polycaprolactone complex fiber, a preparation method and application thereof, and an operation suture line. The complex fiber comprises a poly lactate geycollic acid fiber and a polycaprolactone complex fiber, wherein the poly lactate geycollic acid fiber is used as a core layer of the complex fiber, and the polycaprolactone fiber is used as a skin layer of the complex fiber. The preparation method comprises the following steps: obtaining poly lactate geycollic acid slices and polycaprolactone slices respectively; and performing composite spinning on the poly lactate geycollic acid slices and the polycaprolactone slices, wherein the poly lactate geycollic acid is used as the core layer, and the polycaprolactone covers the poly lactate geycollic acid to form the skin layer of the complex fiber so as to obtain the poly lactate geycollic acid and polycaprolactone complex fiber. The composite fiber can be used for the operation suture line. The operation suture line is prepared from the complex fiber. The complex fiber can not only alleviate the characteristic of easy degradation of the poly lactate geycollic acid fiber, but also can enhance the flexibility of the poly lactate geycollic acid fiber.