82results about How to "Remain biodegradable" patented technology

A metallized laminate film exhibiting improved moisture barrier property as well as maintaining a high bio-polymer content and degradability property is disclosed. The laminate film includes a first core layer of polylactic acid polymer and a second skin layer comprising a polyolefin metal receiving layer. The metal receiving layer or the core layer, or both, may be blended with an amount of polar-modified tie-resin to improve bonding. Alternatively, a discrete tie-resin layer may be interposed between the polyolefin metal receiving layer and the crystalline polylactic acid polymer core layer. The polyolefin metal receiving layer may be discharge-treated on the side opposite the core layer and metallized.

Disclosed are biaxially oriented laminate films including a core layer including a blend of crystalline polylactic acid polymer and crystalline polystyrene. The films are biaxially oriented at low transverse direction orientation temperatures to impart a degree of cavitation around the crystalline polystyrene such that a white opaque cavitated appearance and lower film densities are obtained. The laminate films may further have additional layers such as a heat sealable layer disposed on one side of the core layer including an amorphous polylactic acid resin and / or a polylactic acid resin-containing layer disposed on the side of the core layer opposite the heat sealable layer, a metal layer, or combinations thereof.

The invention discloses biodegradable toughened heat-resistant polylactic acid modified resin and a preparation method thereof. The polylactic acid modified resin comprises the following raw materials in percentage by mass: 30%-90% of polylactic acid, 5%-65% of thermoplastic starch, 3%-40% of a completely biodegradable plant fiber and 1%-10% of an adjuvant, wherein the adjuvant is a lubricating agent, a coupling agent and an antioxidant. The method comprises the following steps: firstly drying various raw materials, adding to a high-speed mixer according to the ratio, and mixing for 5-30 minutes; and adding the obtained mixture to a twin-screw extruder, and plastifying, extruding and pelletizing to obtain the biodegradable toughened heat-resistant polylactic acid modified resin. The preparation method of the polylactic acid modified resin disclosed by the invention is simple in equipment requirements and technological process, low in cost, easy for large-scale production, economical and efficient; and the thermoplastic starch and the completely biodegradable plant fiber are added to polylactic acid matrix, so that the prepared product has relatively good heat resistance and impact property.

The invention discloses a method for preparing a transparent heat-resistance polylactic acid modification material, in which three methods for improving the heat resistance of polylactic acid, namely a method for changing a polylactic acid crystal state by using a nucleating agent, a method for changing a polylactic acid molecular structure by the crosslinking of a chain extender and a method formixing the polylactic acid and high glass transition temperature (Tg) polymer materials, are adopted. The method comprises the following steps of: drying all raw material mixed complexes at 80 DEG C for 5 hours; and granulating or directly processing to form a transparent heat-resistance polylactic acid product. The polylactic acid modification material comprises the following raw materials in parts by weight: 100 parts of polylactic acid, 5-10 parts of chitin whisker polymethyl methacrylate coating, 0.5-2.0 parts of chain extender, 3-5 parts of oligomer polylactic acid, and 0.1-0.5 part of 3-(nonyl-phenyl) phosphite ester. By using the method, the thermal deformation temperature of the polylactic acid composite material is over 100 DEG C, and the biodegradability and the high transparency of the composite material are effectively maintained.

The invention belongs to the field of polymer materials, and concretely discloses an antibiotic degradable water retaining agent and a preparation method thereof. The water retaining agent is prepared from acrylic acid, acrylamide, long-chain quaternary ammonium salt, kaolin and sodium alginate through a redox system aqueous solution polymerization technology with ammonium persulfate or potassium persulfate as an oxidant, sodium bisulfite as a reducing agent and N,N-methylenebisacrylamide as a cross-linking agent. Acrylic acid is neutralized with ammonia water or ammonium bicarbonate, so the problem of soil hardening induced by long-term application of a sodium base water retaining agent to soil is avoided, and nutrients are provided. Kaolin with low price and wide sources and biodegradable sodium alginate are introduced to a copolymerization system, so the preparation cost of the water retaining agent is effectively reduced, and the gelly strength, the water absorption rate, the salt resistance and the biodegradability of the water retaining agent are improved. A wide-spectrum antibiosis material is also introduced, so storage of the degradable water retaining and further prolongation of the service life of the water retaining agent are facilitated. The antibiotic degradable water retaining agent can be widely applied in the fields of agriculture, forestry, gardening, ecologic construction and desert treatment.

The invention discloses a magnesium or magnesium alloy material or device with multiple surface protection layers and a production method. The magnesium or magnesium alloy material or device with multiple surface protection treatment has the aims that the initial mechanical attenuation of magnesium / magnesium alloy in a physiological environment is decelerated, the corrosion resisting property of the magnesium / magnesium alloy is improved, and the time of service is effectively prolonged. The protection treatment comprises the steps: 1) manufacturing a magnesium / magnesium alloy substrate, and cleaning the surface of the substrate; 2) carrying out chemical conversion treatment on the surface of the magnesium / magnesium alloy substrate, so as to grow a chemical conversion film, of which the thickness is several nanometers, on the surface of the substrate; 3) coating the chemical conversion film with an adhesive layer; 4) coating the outside surface of the adhesive layer with a degradable polymer film. The magnesium or magnesium alloy material or device with multiple surface protection treatment, provided by the invention, can be applied to biomedical implantation or intervention therapy and has the advantages of being good in initial corrosion resisting property in a human physiological environment, meeting clinical requirements of medical treatment and being finally in-vivo degradable.

The invention discloses a hyperbranched polyphosphate amide ester and a preparation method of flame-retardant biodegradable polyester thereof. The hyperbranched polyphosphate amide ester is prepared in the following steps: firstly reacting such A3 monomers as phosphorus oxychloride with such BB' monomers as methanolamine, ethanolamine and propanolamine under the protection of nitrogen, and then, adding a catalyst and an acid binding agent to perform a polycondensation reaction to generate the hyperbranched polyphosphate amide ester through one-pot method. The molecular structure of the prepared hyperbranched polyphosphate amide ester simultaneously contains a phosphate bond and a phosphamide bond, and the prepared hyperbranched polyphosphate amide ester is biodegradable, so that when 2wt% of the synthesized hyperbranched polyphosphate amide ester is added in biodegradable polyester, the oxygen index reaches 30-35%, and UL-94 passes V-0 level. The prepared flame-retardant biodegradable polyester prepared by the invention keeps the biodegradability of the whole system, and the fire-retardant biodegradable polyester has better nucleation property. The flame-retardant biodegradable polyester can be used as fiber, engineering film and injection shaped piece.

The invention discloses an oxidized chitosan quaternary ammonium salt and a preparation method thereof. The oxidized chitosan quaternary ammonium salt is a substance formed by selectively oxidizing the 2,3- carbon-carbon bonds in the chitosan quaternary ammonium salt saccharide unit into formyl groups. The preparation method comprises the following steps: selectively oxidizing carbon-carbon bonds of the chitosan quaternary ammonium salt in a dark place by using sodium periodate, stopping the reaction, purifying and drying to obtain the high-purity oxidized chitosan quaternary ammonium salt. The oxidized chitosan quaternary ammonium salt contains both high-reaction-activity formyl groups and quaternary ammonium groups, and thus, has the crosslinking and antimicrobial / antibacterial functions, thereby being a new-generation functional crosslinking agent. The oxidized chitosan quaternary ammonium salt can be widely used as a biological crosslinking agent, chemical coupling agent, microsphere crosslinking agent, immobilized enzyme crosslinking agent or the like, and can also be used for retanning, color fixation and the like in leather industry.

The invention discloses a modified polylactic acid (PLA), its preparation method and application. The preparation method of the modified polylactic acid comprises the steps of: reacting polylactic acid with epoxidized natural rubber (ENR) by a solution co-blending method or a melt extrusion method so as to obtain blends, annealing the blends, thus obtaining the modified polylactic acid. In the method, biodegradable polylactic acid is taken as the raw material, and the natural elastomer NR (natural rubber) or ENR is added through the solution co-blending method or melt extrusion method. By controlling the NR / ENR content and epoxidation degree, the melt extrusion temperature, the annealing temperature and annealing time, etc., the method adjusts the crystallinity, crosslinking degree and phase separation of PLA, so that the weakness of poor toughness of PLA is made up substantially, and the thermostability of PLA is improved. Thus, the processibility of PLA is improved. Characterized by simple process, easy operation and probable enforcement in production, the method provided in the invention provides a new choice for adjusting the properties of PLA.

The invention provides a PBAT-based biodegradable composite material with high vapor barrier property. The composite material comprises the following components: PBAT, organic modification material, inorganic modification material, an initiator, a compatilizer and a catalyst. Compared with the prior art, the PBAT-based biodegradable composite material has the following beneficial effects: the compatibility and dispersity of the inorganic material in PBAT can be greatly improved by bridging PBAT with the inorganic material; the bridging action, generated due to combination of the compatilizer and the initiator, of the inorganic material is partially directionally distributed by layers in a blending system, the pass route of water molecules can be prolonged, and the motion time of the water molecules in the material can be prolonged, so that the water retention property of the material can be remarkably improved, the water vapor permeability of the composite material 10mum thin film material is reduced to 320g / m<2>.24h from 280g / m<2>.24h of the original-specification thin film, which is obviously superior to the similar materials.

The invention discloses anti-bacteria heat-proof polylactic acid tableware, which is prepared from polylactic resin, oxide, viscose fiber, initiator and alkyl ether carboxylate. The invention also discloses a preparation method for the anti-bacteria heat-proof polylactic acid tableware. The anti-bacteria heat-proof polylactic acid tableware has the advantages of simple preparation technology flow, easiness in control, low composite material cost, good heat resistance and high anti-bacteria performance, is biodegradable and can be used in fields including the tableware, food, medical packaging materials and the like.

The invention relates to the field of papermaking, in particular to non-heat-seal type tea leaf filter paper. The filter paper is prepared by mixing paper mulberry bark pulp, bleached softwood pulp and viscose acetal fibers for papermaking, green natural polymer assistants are selected as chemical assistants added into the pulp, and the filter paper has the characteristics of complete natural circulation and biological decomposition. The invention also discloses a preparation method of the tea leaf filter paper. The preparation method comprises the following steps: (1) pulping; (2) preparing pulp; (3) forming on a net; (4) squeezing; (5) drying; and (6) slitting the roll paper. The tea leaf filter paper prepared by the preparation method has good dry and wet strength, uniformity and softness and high air permeability, is beneficial to permeation of tea fragrance, is light in weight, can save packaging cost for users, and has higher market competitiveness.

The present invention discloses cross-linked polymethacrylic ethylene carbonic acid ester polymer electrolyte membrane and the preparation method. The polymer electrolyte membrane consists of cross-linked polymethacrylic ethylene carbonic acid ester polymer and electrolyte solution including conductive lithium salt and non-protonic solvent. The preparation method adopts carbon dioxide, epoxy dimethylmethane and unsaturated acid anhydride which are synthesized into polymethacrylic ethylene carbonic acid ester trivalent copolymer with special functional group under the role of catalyst dyadic carboxylic acid zinc. Then the trivalent copolymer is under the cross-linking reaction so as to get the dry polymethacrylic ethylene carbonic acid ester polymer membrane. Afterwards, the dry membrane is immerged into the liquid electrolyte solution for activation, thus obtaining the cross-linked polymethacrylic ethylene carbonic acid ester polymer electrolyte membrane. The polymer electrolyte membrane prepared by the present invention has the advantages of high mechanical performance, good thermal performance and high ion electric conduction. The present invention with low cost and simple process is applicable to the industrialized production.