50results about How to "Breaking hydrogen bonds" patented technology

The invention provides a preparation method for new type fully-degradable cellulose composite fiber with skin-core structures. The preparation method is characterized by comprising steps: cellulose and biomass polyesters are subjected to vacuum drying, the cellulose and ionic liquids are added in a high-speed mixer according to the ratio and stirred evenly, the mixture of the cellulose and the ionic liquids is added in a co-rotating twin-screw extruder through a feeding inlet, the biomass polyesters obtained from the first step are added through another feeding inlet, both of the mixture and the biomass polyesters are extruded by the co-rotating twin-screw extruder into a spinning pack to be spun through spinneret plates, the obtained composite fiber goes through a water tank and the ionic liquids in skin layers are washed off, then the composite fiber is stretched and wound through the spinning pack, and the new-type fully-degradable cellulose composite fiber with skin-core structures is obtained. The composite fiber has advantages of good hygroscopicity, comfortableness and chromaticity of cellulose and good mechanical properties of polylactic acid, and retains the biodegradable characters of cellulose and polylactic acid, and is suitable for the medical and taking fields.

The invention relates to a method for extruding in-situ grafting modified cellulose through twin screws with ionic liquid serving as a solvent. The method comprises the following steps: (1) drying the cellulose and a grafting monomer in vacuum; (2) uniformly mixing the following raw materials by weight percent: 4 to 8% of cellulose, 30 to 40% of grafting monomer, 51.84 to 65.92% of ionic liquid, 0.04 to 0.08% of initiator, and 0.04 to 0.08% of catalyst; and (3) extruding the mixture by a co-rotating twin-screw extruder, so as to obtain the in-situ grafting modified cellulose. By adopting the method, high flowing property is provided on the basis that the original performances of the cellulose are remained; the cellulose grafting copolymer, which is easily processed and formed, and efficient, green and clean, can be obtained; and the development on novel cellulosic fibers, which are low in energy consumption, economic and feasible and environmentally friendly, can be promoted.

The invention discloses a preparation method of a bamboo fiber-based degradable environmental protection material, comprising the following steps: step S1, weighing raw materials; step S2, drying the raw materials; step S3, weighing 6% polylactic acid and ethylene / acrylate / Glycidyl methacrylate terpolymer was banburyed for 40 minutes at 250°C and a rotational speed of 100r / min to obtain a pre-reactant; step S4, preparing pre-treated talcum powder; step S5, pre-reactant, remaining polylactic acid , Pretreatment talcum powder blending. The present invention adopts polylactic acid as matrix, and ethylene / acrylate / glycidyl methacrylate terpolymer toughens and modifies it; by modifying bamboo fiber first, not only the interface with PLA matrix can be increased Compatibility can also endow the material with good antibacterial properties; through the addition of talcum powder and coupling agent, it can play a reinforcing effect, further improve the mechanical properties of the material, and prepare a biodegradable and biodegradable material with excellent mechanical properties. Environmentally friendly material with antibacterial properties.

The high flexibility biodegradable non-woven fabric of the present invention, described non-woven fabric comprises: upper layer fiber web layer and lower layer fiber web layer; Wherein, upper layer fiber web layer is made of toughened polylactic acid fiber, pure cotton fiber; The described The lower web layer is made of toughened polylactic acid fibers and coarse denier ES fibers. In the non-woven fabric of the present invention, the toughened polylactic acid fiber prepared by adding 5-30% by weight of the modified hemp nanofiber to the polylactic acid masterbatch is used; the surface modification is used as a toughening agent to improve the toughness of the polylactic acid ; At the same time, it destroys the dense hydrogen bonds on the surface of nanocellulose, improves the redispersibility of nanocellulose, and is beneficial to the dispersion of nanofiber fillers in the polylactic acid system; at the same time, the smooth surface and cool feeling treatment can eliminate the contact between hemp fiber and human body tingling sensation.

The invention relates to the preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery, in particular to a preparation method of a lithium-sulfur battery electrode-electrolyte material. The specific steps of the present invention are as follows: 1. Preparation of conductive carbon material for active material carrier; 2. Preparation of conductive carbon-sulfur composite material; 3. Preparation of polymer electrolyte and binder; 4. Integrated flexible electrode-electrolyte material Preparation; five, battery assembly. The solid-state lithium-sulfur battery prepared by the method of the present invention has good cycle stability, and the discharge specific capacity after 55 cycles is 573.1mAh g ‑1 , the capacity retention rate was 80.89%, and the average Coulombic efficiency was 97.24%. The invention fundamentally solves the irreversible attenuation of capacity caused by the shuttle effect of the liquid lithium-sulfur battery, inhibits the growth of lithium dendrites and effectively solves various safety problems caused by the electrolyte.

The invention discloses a preparation method of an enhanced polyisophthaloyl metaphenylene diamine hollow fiber membrane. The preparation method includes the following processing steps of (1) preparation of a hollow braided hose: adopting a well-known two-dimensional braiding technique to braid fibers into the hollow braided hose, and taking the hollow braided hose as an enhancing body of the enhanced hollow fiber membrane; (2) preparation of PMIA membrane casting dissolving fully dried PMIA resin, additives and a pore-forming agent in an organic solvent at the temperature of 60-70 DEG C, stirring for 4-6h to obtain homogeneous solution, and performing vacuum defoaming to obtain the PMIA membrane casting (3) preparation of the enhanced PMIA hollow fiber membrane: adopting a coextrusion composite spinning process to subject the hollow braided hose obtained in the step (1) and PMIA membrane casting solution obtained in the step (2) to coextrusion through an annular spinning jet, uniformly coating the surface of the hollow braided hose with the membrane casting solution, and fully curing to obtain the enhanced PMIA hollow fiber membrane.