6results about How to "Improve crosslink strength" patented technology

The invention relates to a collagen-based artificial cornea with a double-layer structure and capable of rapidly epithelizing and a preparation method thereof, and the preparation method comprises the following steps: adding collagen into an acetic acid solution, stirring and dissolving, and adding a plasticizer to obtain a high-concentration collagen solution and a low-concentration collagen solution; carrying out electrochemical deposition on the high-concentration collagen solution to obtain a collagen membrane I; carrying out photo-crosslinking on the collagen membrane I through strong ultraviolet irradiation; performing chemical crosslinking on the first collagen membrane to obtain a compact layer; a low-concentration collagen solution is taken and poured into the deposition tank, the compact layer is immersed, secondary electrochemical deposition is carried out, and a second collagen film is obtained on the compact layer; the second collagen membrane is subjected to secondary photo-crosslinking through weak ultraviolet irradiation, a loose layer is obtained, and the loose layer and the compact layer are combined to form the collagen-based artificial cornea which is of the double-layer structure and can be rapidly epithelized. The collagen-based artificial cornea with the double-layer structure and capable of being epithelialized rapidly has high light transmittance and meets clinical mechanical properties, the light transmittance at 600 nm is higher than 90%, the tensile strength of the collagen-based artificial cornea is higher than 1 MPa, and the elastic modulus of the collagen-based artificial cornea is higher than 10 MPa. The swelling rate is low, the tissue compression of the product on the autologous cornea can be avoided, the mechanical stimulation on the eye tissue is reduced, and the comfort after implantation is improved.

The invention relates to the technical field of foamed silicone rubber and production and preparation processes, in particular to high-hardness foamed silicone rubber and a preparation method thereof.The high-hardness foamed silicone rubber is prepared from 1-20 parts of hydrogen-containing polysiloxane, 10-70 parts of hydroxyl-terminated polymethylvinylsiloxane, 1-30 parts of a mechanical reinforcing agent, 10-80 parts of a flame retardant and 0.05-0.3 part of a catalyst; the mechanical reinforcing agent is a mixture which simultaneously uses fumed silica, vinyl MQ silicon resin and surface-treated carbon nanotubes, so that the foamed silicone rubber has high hardness and does not increase the density, and meanwhile, by utilizing the shear thickening gel which is filled and adsorbed in the carbon nanotubes, when the foamed silicone rubber material is pressed, the foam silicone rubber material is not easy to deform. According to the present invention, the carbon nano-tube can rapidly harden, such that the originally soft carbon nano-tube can form the skeleton support on the foamed silicone rubber so as to improve the compressive strength and the permanent deformation property of the foamed silicone rubber, such that the foamed silicone rubber material with characteristics of good hardness, low density, excellent compressive strength and excellent resilience can be used for new energy battery support.

The present application belongs to the technical field of lithium resource extraction. The present application provides a gel-state lithium ion adsorbent and a preparation method and a delithiation method thereof. The preparation method comprises mixing lithium ion sieve material, alginate, galloyl glucose compound and calcium chloride to gel, and then drying to obtain dry gel, thereby obtaining the gel-state lithium ion adsorbent. The preparation method uses alginate and galloyl glucose compound to mix and crosslink, thereby improving the crosslinking strength and the compression resistance of the gel, and making the pore size distribution of the gel more uniform and dense, which is beneficial to improving the lithium extraction capacity. The obtained dry gel has a larger particle size than the powder, and has better hydrophilicity, which can increase the flowability during lithium extraction and reduce the loss, thereby improving the cycle efficiency.

The invention discloses a preparation process of a high-adhesion anti-cracking liquid metal film, and relates to the technical field of metal materials. The high-adhesion anti-cracking liquid metal film is prepared from the following components in parts by mass: 30 to 60 parts of polyurethane adhesive, 20 to 50 parts of mixed liquid silicone rubber and 10 to 20 parts of liquid metal. The polyurethane adhesive contains ester bonds and ether bonds, the mixed liquid silicone rubber contains a tackifier, and modified siloxane is added into the tackifier. According to the invention, ester bonds and ether bonds are introduced in the synthesis process of polyester polyol, so that the product has the characteristics of polyester and polyether, and the toughness and weather resistance of the polyurethane adhesive are improved; the tackifier is added into the liquid silicone rubber, so that the adhesive property of the liquid silicone rubber is enhanced, the compatibility of the liquid silicone rubber and polyurethane is improved by adding the modified siloxane, so that the liquid silicone rubber can be better combined with polyurethane, and the prepared film has better tensile property and adhesive property.

The present application relates to the technical field of paint, in particular to an alkali-resistant waterproof exterior wall paint and a preparation method thereof. In order to further improve the water resistance and alkali resistance of the stone-like paint, the stone-like paint is improved, a texture protective paint is added to the structure of the traditional stone-like paint, and colored sand is added to the components, so that a concave-convex texture can be provided for the surface of the stone-like paint after the stone-like paint is finally formed. In addition, boron nitride nanosheets are added to the texture protective paint and modified, and fluorine and silicon elements are introduced into the boron nitride nanosheets, so as to improve the chemical corrosion resistance of the resin, prevent the infiltration and invasion of external corrosive media, and effectively improve the acid and alkali resistance of the resin paint.

The invention discloses an ablation-resistant heat-insulating coating, an ablation-resistant heat-insulating coating and a preparation method thereof, and relates to the field of heat-insulating coatings, self-made modified ablation-resistant light filler, modified closed-cell aerogel light heat-insulating filler, fiber reinforced filler, reinforcing filler and a matrix film forming matter are mixed and cured, and the heat-insulating coating capable of being quickly repaired and formed is obtained. The coating obtained by the prepared coating is based on the modified closed-cell aerogel light heat-insulating filler and the modified ablation-resistant light filler, and can realize non-shrinkage rapid curing and high bonding strength with a base material on the basis of keeping excellent three-dimensional structure and performance, and the temperature-resistant heat-insulating performance of the material is improved. In addition, the coating can also be used for repairing defects of coatings of the same type.