4results about How to "Physically good" patented technology

The invention belongs to the technical field of blown film preparation, and relates to a bio-based poly (butylene furandicarboxylate) blown film and a preparation method thereof, and the blown film is prepared from poly (butylene furandicarboxylate) with specific molecular weight and functional master batch. The preparation method comprises the following steps: step A, preparing polybutylene furandicarboxylate; and step B, preparing the polyfurandicarboxylic acid butanediol blown film. The butanediol furandicarboxylate blown film not only shows excellent thermal stability and mechanical strength, but also has good antibacterial and barrier properties, so that the film is applicable to the fields of food, medicine packaging, agricultural films and the like. The invention aims to provide an environment-friendly high polymer material blown film completely derived from biomass, so as to reduce plastic pollution and provide a sustainable material choice.

The present invention relates to a hot-pressed PVC floor and a preparation method thereof. The hot-pressed PVC floor comprises the following components, in parts by weight: 20 to 33 parts of modified PVC resin, 10 to 20 parts of modified glass fiber, 3 to 5 parts of diphenyl isooctyl phosphate, 5 to 10 parts of plasticizer, 5 to 8 parts of stabilizer, 20 to 30 parts of filler, 2 to 3 parts of internal lubricant, 2 to 3 parts of external lubricant, 3 to 5 parts of polyvinyl alcohol, 3 to 10 parts of processing aid, and 1 to 2 parts of antioxidant. During preparation, the raw materials are put into an extruder according to the ratio, and the extruder is extruded and hot-pressed to form, and then the PVC floor substrate and the wear-resistant layer are hot-pressed. The hot-pressed PVC floor of the present invention has good stability, good impact resistance, high temperature resistance, deformation resistance, aging resistance and good flame retardancy.

The invention relates to the technical field of epoxy coatings, in particular to a polyaspartic acid resin modified cashew phenolic aldehyde amine epoxy curing agent as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: mixing first cardanol, first fatty amine, polyaspartic acid ester and an accelerant in an inert atmosphere, adding a first substance for providing a formaldehyde monomer in batches, and carrying out a first Mannich reaction to obtain a first reaction system; and mixing the first reaction system, second cardanol and second aliphatic amine, adding a second substance for providing a formaldehyde monomer in batches, carrying out a second Mannich reaction, dehydrating, adding a double epoxy diluent, and carrying out a ring-opening addition reaction to obtain the polyaspartic acid modified cardanol aldehyde amine epoxy curing agent. The polyaspartic acid resin modified cashew phenolic aldehyde amine epoxy curing agent prepared by the preparation method disclosed by the invention has the advantages of good adhesive force, good corrosion resistance and good water resistance.

This invention provides a dense honeycomb structure cross-linked sodium hyaluronate gel and its preparation method, comprising the following steps: S1. Preparing a chloride ion solution, adding a cross-linking agent, slowly adding sodium hyaluronate under stirring conditions, adjusting the pH to alkaline, and stirring evenly under vacuum conditions to obtain a mixture; S2. Maintaining vacuum conditions, heating the mixture in a water bath, cutting it to obtain a block gel, cross-linking it in a water bath to obtain a cross-linked sodium hyaluronate gel; S3. Adjusting the pH of the cross-linked sodium hyaluronate gel to neutral, performing a first vortex-shear composite grinding treatment to obtain a homogeneous paste-like gel, dialysis, then a second vortex-shear composite grinding treatment, adding non-cross-linked sodium hyaluronate and PBS solution, performing a third vortex-shear composite grinding treatment, filling, and sterilizing to obtain the dense honeycomb structure cross-linked sodium hyaluronate gel. The dense honeycomb structure cross-linked sodium hyaluronate gel obtained by this invention has smooth injection, strong support, long-lasting effect, and low adverse reaction rate.