401 results about "Hydroxy fatty acid" patented technology

The invention discloses a repulpable and degradable PHA heat-seal barrier coating and a composition thereof, and belongs to the field of water-based functional coatings and cellulose-based packaging materials. The coating composition is prepared from the following components in percentage by non-volatile solids: 30 to 85 weight percent of polyhydroxyalkanoate emulsion, 5 to 60 weight percent of flaky natural inorganic matters, a water-based cross-linking agent and an auxiliary agent, and 1 to 20 weight percent of ethylene-acrylic acid or ethylene-methyl acrylate dispersion can be selected. The pH value of the composition is 6.5-9.0, and organic fluorine is not artificially added. When the dry weight is 6-20 g / m, the coating meets at least one of the following four items: the water vapor transmission rate (38 DEG C, 90% RH) is less than or equal to 80 g / m.d, Cobb60 is less than or equal to 15 g / m, the oil resistance grade is greater than or equal to 11, and the laboratory repulping rate is greater than or equal to 98%; and the heat-sealing peel strength is greater than or equal to 2.5 N / 15mm under the conditions of 150 DEG C, 0.2 MPa and 0.5 s. And the coating and the stripping film thereof meet the industrial composting standard.

The invention discloses a polyhydroxyalkanoate water-based barrier coating composition and application, and belongs to the technical field of packaging materials. The composition takes water as a dispersion medium and comprises polyhydroxyalkanoate, a plasticizer, an emulsifier and an inorganic nano filler. The stable emulsion with the volume average particle size of 400-700nm is prepared under specific proportioning and process conditions. After the emulsion is applied to a paper substrate according to the dry film coating weight of 10-12 g / m, the obtained coating shows good comprehensive performance: the oxygen permeability is not higher than 580 cm / m.d, the water vapor permeability is not higher than 290 g / m.d, and the heat sealing strength at 130 DEG C is not lower than 5.0 N / 15 mm. The biodegradable paper-based packaging film does not contain fluorine compounds, can be completely biodegraded, and provides a technical path for sustainable paper-based packaging.

The invention discloses a pure bio-based polyhydroxyalkanoate adhesive as well as preparation and application thereof, and belongs to the technical field of degradable adhesives. According to the adhesive, polyhydroxybutyrate valerate or polyhydroxybutyrate hexanoate is used as a matrix, and the acid value reaches 2-15 mg KOH / g through molten end group activation; a reactive emulsifier with a hydrophilic-lipophilic balance value of 9-12 is introduced into a water phase, and the stable aqueous dispersion is prepared through phase inversion high-shear emulsification. The Z-average particle size of the dispersion is 0.12-0.30 [mu] m, and the content of the free surfactant is not higher than 30wt%. After the tackifying resin, the plasticizer and the vegetable wax are compounded, the bio-based carbon content of the obtained adhesive is not lower than 95%, and the volatile organic compound content is not higher than 100 mg / kg. The paper / paper heat sealing strength of the adhesive is not lower than 7.0 N / 15mm, the 180-degree peel strength is not lower than 7.5 N / 25mm, and the adhesive can pass repulping evaluation.

The invention discloses a pure bio-based PHA aqueous dispersion as well as a preparation method and application thereof, and belongs to the technical field of pure bio-based polymer aqueous dispersion. According to the dispersion, polyhydroxyalkanoate is used as a unique film forming matter, Pickering solid particles and a natural surfactant are adopted for synergistic stabilization, and a bio-based plasticizer can be selected. The emulsion or slurry with the polyhydroxyalkanoate content of 40-85wt% and the particle size of 0.2-3m is prepared through a melting high-pressure homogenization method, a low-temperature wet grinding method or a solvent replacement method. The coating does not contain petrochemical polymer protective colloid and perfluorinated and polyfluoroalkyl substances, and the bio-based content is greater than or equal to 99%. Due to the excellent stability, rheological property and film-forming property of the modified starch, the modified starch becomes an ideal basic material for constructing a multi-layer programmable controlled release and degradation functional coating system, can be used in the fields of paper-based barrier coatings, adhesives, advanced crop seed coats and the like, realizes excellent barrier, bonding and controlled release properties, meets the industrial compost and repulping property standards, and has wide application prospects. The method has green, environment-friendly and industrial potential.

The invention provides a PHA dispersion emulsion as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The invention aims to solve the technical problem that the prior art cannot simultaneously meet the requirements of the polyhydroxyalkanoate water dispersion system on extremely low temperature natural film-forming property, excellent comprehensive performance after film formation and long-term storage stability. The method is characterized in that a polyhydroxyalkanoate polymer with specific molecular weight and polydispersity index range, a coalescing agent 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate with a specific chemical structure and a specific type of aliphatic polyisocyanate cross-linking agent compatible with water dispersion are strictly limited and combined. Through the synergistic effect generated by the unique ternary combination, the minimum film forming temperature of the prepared emulsion can be reduced to 6-10 DEG C, a film can be naturally formed without hot pressing, and the formed film has excellent mechanical property, water resistance and adhesive force and has excellent storage stability of at least one year.

The invention provides a recombinant strain for controllably synthesizing high-proportion 4-hydroxybutyric acid (4HB) polyhydroxyalkanoate (PHA) as well as a construction method and application of the recombinant strain. The recombinant strain disclosed by the invention can be used for efficiently producing high-proportion poly (3-hydroxybutyrate-4-hydroxybutyric acid) (P34HB for short) by using glucose as a unique carbon source or a 4HB structure related or non-related carbon source in amplification production of a shake flask, a 7L fermentation tank, a 100L fermentation tank and a 5000L fermentation tank.

The invention discloses a water-based multi-layer degradable self-polishing ship antifouling coating system and a preparation method thereof, and belongs to the field of marine anticorrosion and antifouling materials. The system is composed of a zinc-rich primer, a modified epoxy intermediate paint and a functionalized finish paint. The finish paint takes polyhydroxyalkanoate as a matrix, and integrates a self-stratification modifier capable of forming a silicon-rich top layer during curing and a latent dual-curing system capable of realizing normal-temperature curing through a synergistic effect. According to the present invention, the mixing mechanism of dynamic self-polishing and static fouling release is adopted, and the innovative curing technology is combined, such that the long working life, the excellent mechanical property and the long-acting antifouling ability are achieved. The drawing adhesive force of the system is not lower than 7.9 MPa, and the environment-friendly requirements that the content of volatile organic compounds is smaller than or equal to 50 g / L, and the content of free diisocyanate monomers is smaller than or equal to 0.1 wt% are met.

The invention relates to the technical field of automatic control, in particular to a monitoring method and system for synthesizing ceramide based on alpha-hydroxy fatty acid, and the monitoring system for synthesizing ceramide based on alpha-hydroxy fatty acid comprises a raw material feeding module, a reaction control module, a quenching-crystallization joint control module and a data integration module; carrying out dynamic weighing monitoring on the raw materials based on the received synthesis instruction, and starting a reaction kettle according to weighing data; performing multi-dimensional data acquisition in real time according to the set reaction data, and performing dynamic feeding control according to the set reaction data; when the TLC detection substrate reaction is completed, the cooling process and the crystallization process are regulated and controlled in real time according to the reaction data until the end point judgment standard is met; according to a received synthesis completion instruction, product quality data is obtained, a monitoring data packet is generated, the synthesis instruction is marked and then stored, process control is accurately monitored and controlled, and the purity and crystal form of the product are ensured.

The invention discloses a cationic core-shell PHA nano-emulsion reinforcing agent as well as preparation and application thereof, and belongs to the technical field of papermaking chemicals. The problems that a traditional wet strength agent is poor in environmental protection property and difficult to recycle, and a conventional bio-based material needs high-temperature curing and is high in energy consumption are solved. According to the reinforcing agent, low-MFFT bio-based polyhydroxyalkanoate is used as a core, and a positive ion shell layer with strong positive charges is wrapped outside the core. The method has the core advantages that extra high-temperature curing is not needed, the film can be efficiently formed under the conventional 105 DEG C drying condition, and the energy consumption is remarkably reduced; meanwhile, high dry and wet strength and water resistance are achieved, the treated paper has excellent re-pulping recycling suitability, and the industrial pain point that traditional wet strength paper is difficult to recycle is solved.

The invention discloses a degradable PHA / PU composite water-based barrier coating and a coated paper product, and belongs to the field of biodegradable polymer coatings. The coating composition comprises a high proportion of polyhydroxyalkanoates as a barrier phase and a bio-based polyurethane as a toughening and heat sealing phase. The key innovation lies in that the cooperation of rigid barrier and flexible functions is realized by accurately regulating and controlling the ratio of two phases and adopting bio-based crosslinking, and the problem that the barrier property, the heat sealability and the flexibility of a traditional single material are difficult to consider at the same time is solved under the condition of low coating amount. The invention provides a full-life-cycle green packaging solution, aims to replace a polyethylene spraying film and a fluorine-containing coating, and has a remarkable application value in the field of food packaging.

The invention discloses a polyhydroxyalkanoate-containing multi-component water-based ink binder system, a water-based ink composition and a preparation method and application thereof, and belongs to the technical field of environment-friendly printing materials and water-based ink. According to the invention, a microscopic two-phase or core-shell structure taking the second film-forming resin as a continuous phase and polyhydroxyalkanoate as a dispersed and enriched phase is constructed. Compared with the prior art, a printing layer can be endowed with excellent anti-blocking property, smooth touch feeling and barrier property under an extremely thin dry film only by using an extremely small amount of bio-based components, and meanwhile, excellent adhesive force and abrasion resistance are ensured. In addition, the water-based ink composition also shows excellent household compost and industrial compost degradation performance. The system not only greatly reduces the cost, but also has excellent paper repulping and deinking characteristics, and provides a high-performance solution for environment-friendly printing.

The application discloses degradable PHA / PU composite water-based barrier coating and coated paper products, and belongs to the field of biodegradable polymer coating. The coating composition contains a high proportion of polyhydroxyalkanoate as a barrier phase and a bio-based polyurethane as a toughening and heat-sealing phase. The key innovation is that by precisely controlling the ratio of the two phases and using bio-based cross-linking, the synergy of rigid barrier and flexible function is achieved, and the problem that the barrier property, heat-sealing property and flexibility of traditional single material are difficult to balance is solved at low coating amount. The application provides a full life cycle green packaging solution, which aims to replace polyethylene shower film and fluorine-containing coating, and has significant application value in the field of food packaging.

The present invention relates to compositions and methods for forming substantially bio-based barrier coatings suitable for application on paper and paperboard substrates, as well as paper and paperboard substrates to which one or more such substantially bio-based barrier coatings are applied. The bio-based barrier coatings of the present invention comprise a bio-wax emulsion comprising one or more bio-waxes, such as castor oil wax, formed by hydrogenation of a bio-based oil, such as castor oil. The barrier coating composition is formed by dispersing a bio-wax emulsion into a polyhydroxyalkanoate (PHA) dispersion and can be applied as a coating at ambient temperature, for example, to paper or paperboard, such as paper or paperboard consisting of regenerated fibers, using conventional industrial processes.

The invention discloses a bacteriostatic and antiviral bamboo pulp paper-based sanitary isolation bag as well as a preparation method and application thereof, and belongs to the field of functional paper-based packaging materials. The isolation bag takes bamboo pulp fiber paper as a base material, and the surface of the isolation bag is coated with a water-based polyhydroxyalkanoate functional coating. According to the preparation method, a special polyphenol derivative-chitosan quaternary ammonium salt-nano zinc oxide organic-inorganic hybrid factor is introduced, and the problem of agglomeration of nano particles is effectively solved by utilizing the special bridging effect of polyphenol, so that high-density cation capture and oxidation inactivation sites are constructed on the surface of the coating. Compared with the prior art, the method has the advantages that the method does not need to depend on organic fluorine compounds, and the excellent waterproof and oil-proof barrier effect and the efficient inactivation of viruses can be achieved only through the extremely low coating amount. In addition, the isolation bag has unique environmental chemical responsiveness, can be efficiently dissociated under the alkaline condition to facilitate repulping recovery, can be completely biodegraded in the natural environment, and perfectly considers the requirements of biological safety protection and green environmental protection.

The invention provides a tropical fruit preservative film which is of a double-layer structure, the outer layer is a moisture-resistant antibacterial layer, and the inner layer is a water-absorbing antifogging antibacterial layer; and the water-absorbing anti-fog antibacterial layer also comprises a pH sensitive microcapsule. The outer layer is prepared from polyhydroxyalkanoate, a humidity sensitive type block copolymer and CuO / SiO2 antibacterial nano-enzyme; and the water-absorbing anti-fog antibacterial layer comprises polyhydroxyalkanoate, a humidity-sensitive block copolymer, hygroscopic zeolite, thymol, gallic acid and a pH-sensitive microcapsule. The preservative film has a certain hydrophobic effect, the humidity of a packaging microenvironment can be adjusted, breeding of putrefying bacteria can be inhibited, meanwhile, thymol and gallic acid form a slow-release antibacterial system, and tropical fruits keep good quality in the storage and transportation links through cooperation of all the components; besides, the pH sensitive microcapsules can respond to acidic substances generated by corruption in real time, help merchants to quickly sort deteriorated fruits, and provide a visual judgment basis for consumers at the same time.

The invention relates to the technical field of environment-friendly high polymer materials, in particular to an environment-friendly furniture protective film and a preparation method thereof. The technical problems that a traditional furniture protection film is insufficient in toughness and short in service life are solved. According to the protective film disclosed by the invention, a polylactic acid, polyhydroxyalkanoate and dimer fatty acid ester flexibilizer blending material is taken as a matrix, a cyanoethylation lignin-cellulose nanocrystal compound reinforcing agent is added to form a dense nano network, and a dynamic cross-linking agent containing disulfide bonds and a functional auxiliary agent are introduced. According to the invention, a solvent-free ultraviolet light / damp and hot dual-curing system is adopted for coating and curing to prepare the coating. The furniture protection film is excellent in mechanical property, toughness is remarkably improved, and the furniture protection film has multiple functions such as high barrier property and the like and has the self-repairing capacity and the full-life-cycle environment-friendly characteristic.

The invention belongs to the field of high polymer materials, and discloses a double-trigger programmable degradable PHA composition and a preparation method thereof. A cured film structure formed by the composition sequentially comprises an outer protective layer, a trigger layer and an inner functional layer from outside to inside, wherein the outer protective layer takes polyhydroxyalkanoate as a base material, a reversible cross-linked network is introduced into the outer protective layer, the trigger layer is provided with humidity and ion double-trigger microcapsules, and the inner functional layer is used for bearing functional auxiliaries. The cured film can maintain low permeability and mechanical stability before application. After application, under the synergistic effect of specific moisture and ions, the trigger layer is activated, so that the cured film is subjected to step-type improvement of moisture permeability in a preset time window, and a through hole is formed. And finally, integral disintegration is realized through physical structure failure. The technology can be applied to the fields of seed coating and the like, the activity of a biological base material can be ensured by adopting a low-temperature process with the temperature lower than 50 DEG C, and unification of stable protection before application and on-demand disintegration after application is achieved.

The invention discloses a paper base-PHA double-sided composite soil biodegradable agricultural mulching film as well as a preparation method and application thereof, and belongs to the technical field of agricultural mulching materials and green high polymer materials. The mulching film comprises a paper base layer and a homologous polyhydroxyalkanoate covering layer arranged on the surface of the paper base layer. Through double-sided synergy of the water-based PHA coating on the soil sticking surface and the thermoplastic PHA extrusion film layer on the windward and rainy surface, and in combination with a'wet-to-heat 'integrated composite process and trace anhydride grafting, super-strong combination of a paper-plastic interface fiber tearing level is realized, and the problem that traditional paper-plastic is easy to layer is solved. Compared with a traditional fluorine-containing product, on the premise that total organic fluorine is not detected, the excellent barrier and moisture conservation performance is achieved with the thinner coating thickness by means of double barriers. The product has excellent mechanical laying adaptability and long-season weather resistance, is fully biodegradable, thoroughly solves the hidden dangers of micro-plastic residues and persistent organic pollutants, and is an ideal green agricultural covering material.

The present invention provides an aqueous polyhydroxyalkanoate coating, a preparation method therefor, and a use thereof. The preparation method for the aqueous polyhydroxyalkanoate coating comprises: subjecting a polyhydroxyalkanoate fermentation solution to cell wall breaking and extraction, to obtain an aqueous polyhydroxyalkanoate dispersion, and then mixing the aqueous polyhydroxyalkanoate dispersion with an additive to obtain the aqueous polyhydroxyalkanoate coating, a dispersant and talcum powder being added during the cell disruption process. By means of using talcum powder to replace a portion of a dispersant as a protective additive for PHA particles, the present invention can prevent the aggregation of PHA particles at high purity, and the resulting aqueous PHA coating exhibits good coating water resistance.

According to the freeze-drying process of the dendrobium officinale solid beverage, psyllium seed husk powder and a trihydroxy fatty acid derivative are compounded to form a synergistic protection system, annealing and segmented freeze-drying processes are combined, ice crystal growth is inhibited on the molecular level, active ingredients are protected, a stable porous structure is constructed on the macroscopic level, and the dendrobium officinale solid beverage is prepared. Finally, the dendrobium officinale solid beverage which is high in active ingredient retention rate and good in color, luster and flavor is efficiently prepared, meanwhile, the freeze-drying period is remarkably shortened, and the production efficiency is improved.

The invention discloses a full bio-based PHA (polyhydroxyalkanoate) liquid bioplastic emulsion and a preparation method thereof. The emulsion takes polyhydroxyalkanoate (PHA) as a matrix, alkyl polyglycoside, fermented glycolipid and a bio-based nonionic surfactant are compounded with pullulan, alginate or micro-nano cellulose to serve as a stable system, and plasticizers such as acetyl tributyl citrate and citric acid, phytic acid or tannic acid are added to serve as compacting agents. The solid content of the emulsion is 35-58%, the volume average particle size D50 is 0.12-0.90 [mu] m, the absolute value of Zeta potential is not less than 30 mV, and the content of volatile organic compounds (VOC) is not higher than 50 g / L; fluorine-containing organic matters are not artificially added, and the total organic fluorine is less than or equal to 100ppm. The overall bio-based carbon content of all organic components in the formula is not lower than 95% according to mass weighting calculation. The invention also provides application of the emulsion in the fields of paper barrier coatings, heat-sealing adhesives and non-woven fabric finishing.

The invention discloses a reversible cross-linked paper coating and a repulping switching process, and belongs to the technical field of paper coatings. The coating is composed of an acrylate emulsion, a polyhydroxyalkanoate dispersion and a dynamic cross-linking system, wherein the system is one of carbonyl-hydrazine, imine, Diels-Alder, ester exchange, borate or polyvalent metal-carboxylate. The coating is coated with 6-15 g / m, the use state is that Cobb60 is smaller than or equal to 18 g / m, Kit is larger than or equal to 10, WVTR is smaller than or equal to 80 g / (m.d) at the temperature of 38 DEG C and the RH of 90%, OTR is smaller than or equal to 200 cm / (m.d) at the RH of 23 DEG C / 80%, the initial sealing temperature is smaller than or equal to 180 DEG C, and the sealing strength is larger than or equal to 6.0 N / 15 mm. In the re-pulping stage, net releasing is triggered through alkali, acid (containing CO2 injection), a chelating agent or ultrasonic assistance, and according to CEPI V3 / PTS-RH 021: 2012, the fiber recovery rate is measured to be larger than or equal to 98%, the coarse slag rate is measured to be smaller than or equal to 1.0%, and the adhesion matter is measured to be smaller than or equal to grade 1. The formula does not contain PFAS, and high bio-based carbon content can be realized.

The invention discloses a degradable antibacterial fiber and a preparation method thereof, and belongs to the field of environment-friendly materials. The invention aims to solve the problems that the antibacterial long-term effect and the degradability are unbalanced, and the toxicity of an antibacterial agent conflicts with the biocompatibility. The fiber is composed of bacteriophage antibacterial peptide, polyhydroxyalkanoate, sodium hypochlorite and the like, the antibacterial peptide is derived from a bacteriophage phi 87S / 06 genome, and a mineralizing solution is prepared according to a ratio of CaCl2 to Na2HPO4 to sodium alginate of 3: 2: 2. The preparation method comprises the following steps: constructing double-plasmid engineering bacteria through gene editing to realize synergistic expression of the antibacterial peptide and PHBV, performing fermentation separation to obtain a copolymer, and performing ionic liquid dissolution, boric acid crosslinking, electrostatic spinning and mineralized coating treatment. After the product is washed for five times, the antibacterial rate is greater than 99%, the weight loss rate in 90 days is 82%, the tensile strength is 18MPa, the elongation at break is 25%, the balance of antibacterial long-term effect, degradability and mechanical property is realized, and the antibacterial material is suitable for the fields of medical dressings and the like.

The invention provides a polyhydroxyalkanoate composition as well as a preparation method and application thereof. The polyhydroxyalkanoate composition comprises at least two kinds of copolymers of 3-hydroxybutyrate and 4-hydroxybutyrate. The at least two copolymers of 3-hydroxybutyrate and 4-hydroxybutyrate at least comprise one segmented copolymer of 3-hydroxybutyrate and 4-hydroxybutyrate, and in the segmented copolymer, the mass percentage content of a 4-hydroxybutyrate structural unit is 0-20%; the at least two copolymers of the 3-hydroxybutyrate and the 4-hydroxybutyrate at least comprise a random copolymer of the 3-hydroxybutyrate and the 4-hydroxybutyrate. The polyhydroxyalkanoate composition has good strength and toughness, the post-brittleness is also obviously improved, and meanwhile, the polyhydroxyalkanoate composition also has good processability and migration resistance.

A liner mat for waste pit management and drilling fluid recycling at well sites is described. The liner mat includes an adsorbent layer and a base layer. The adsorbent layer includes chitosan and polyhydroxyalkanoate (PHA). The base layer includes polylactic acid (PLA). In some cases, the base layer includes hydroxyapatite (HAp). The adsorbent layer contacts the drilling fluid. The adsorbent layer can mitigate microbial growth and adsorbs at least a portion of pollutants from the drilling fluid. The base layer provides structural support and resistance against mechanical stress and tearing.

The present invention relates to a hot-melt adhesive composition comprising a biodegradable plastic, a thermoplastic polymer, a tackifier and a plasticizer, wherein the biodegradable plastic includes polyhydroxyalkanoate (PHA). The hot-melt adhesive composition according to the present invention has lower viscosity and higher adhesiveness compared to a petroleum-based hot-melt composition, and can be used as an eco-friendly hot-melt adhesive composition having physical properties corresponding to an excellent recycling criteria grade under recyclability assessment criteria.

The invention discloses a paper-based molded coffee capsule capable of being naturally composted, a PHA aqueous dispersion in-situ film forming barrier heat-sealing composite layer, a preparation method and application thereof, and belongs to the field of degradable packaging and single-cup extraction capsules. The capsule body is formed by molding paper pulp and is provided with a side wall, a bottom wall and a mouth flange; the biodegradable polyester-based film sealing component is connected to the flange in a sealing manner; and the polyhydroxyalkanoate barrier heat-sealing composite layer covers the inner surface of the body and the sealing surface of the flange. The composite layer is obtained by in-situ film forming of a particle size gradient double-layer aqueous dispersion and comprises a permeation anchoring layer located in paper pulp pores and a continuous compact layer located on the outer side in the thickness direction. The flange is a hot-pressing densified area, and a local thickening heat sealing ring is formed on the sealing face of the flange. Through physical anchoring of the small-particle-size components and surface film forming of the large-particle-size components, the moisture and oxygen blocking and interface bonding performance is achieved, and the brewing sealing performance is guaranteed.

The invention discloses a preparation method of a regulatable and degradable ecological environment-friendly nutrition cup, and belongs to the technical field of biodegradable materials and garden seedling raising containers. Aiming at the technical problems of insufficient long-term supporting strength, mismatch between degradation rate and seedling growth cycle and low fiber axial enhancement efficiency of a garden seedling nutrition pot, the invention provides a solution for regulating and controlling through interface enhancement and gradient degradation. Adding a nanoscale inorganic filler, sodium alginate, a sterilizing agent, a rooting accelerant and potassium humate, and performing staged temperature-controlled stirring to form a phase separation structure; carrying out twin-screw extrusion and directional molding to obtain a cylindrical green body in which starch particles are wrapped by a polylactic acid continuous phase network and fibers are axially arranged; a polycaprolactone and polyhydroxyalkanoate blending coating is adopted, and a controllable degradation layer is formed on the surface through ultraviolet radiation gradient crosslinking. The nutrition bowl prepared by the method has the characteristic of precise and controllable degradation period, and is suitable for containerized seedling culture of large garden seedlings.

The invention belongs to the technical field of preparation of molecular materials and adhesive tapes, and discloses a degradable mylar adhesive tape and a preparation method thereof, the degradable mylar adhesive tape comprises a degradable base material layer and a degradable adhesive layer; the degradable base material layer is prepared from the following raw materials in parts by mass: 25-35 parts of poly (butylene succinate) (PBS), 20-30 parts of polylactic acid (PLA), 10-15 parts of polycaprolactone (PCL), 8-12 parts of modified bamboo fiber powder, 3-5 parts of a compatibilizer and 0.5-1 part of an antioxidant; the degradable adhesive layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of a modified starch-based adhesive, 15 to 25 parts of poly (butylene adipate-co-terephthalate) (PBAT), 10 to 15 parts of polyhydroxyalkanoate (PHA), 5 to 8 parts of sodium alginate-chitosan composite gel, 5 to 8 parts of an epoxypropane modifier, 1 to 2 parts of a cross-linking agent and 0.3 to 0.5 part of a de-foaming agent; by optimizing the raw material composition and the preparation process of the base material and the adhesive, the full-life-cycle degradability of the adhesive tape is realized, and meanwhile, excellent mechanical properties, insulativity and temperature resistance are ensured.

The invention relates to the technical field of waterproof gas-permeable membranes, in particular to a waterproof gas-permeable membrane with heat preservation performance and a preparation method thereof.The waterproof gas-permeable membrane with the heat preservation performance comprises a bio-based polymer, an ultraviolet light absorber, heat preservation filler, a plasticizer and a cross-linking agent.The bio-based polymer is selected from one or more of polylactic acid (PLA), polyhydroxyalkanoate (PHA) and cellulose ester; the ultraviolet light absorber is a mixture of nano-zinc oxide and nano-titanium dioxide, the thermal insulation filler is a combination of aerogel microspheres and hollow glass beads, the plasticizer is tributyl citrate or acetyl tributyl citrate, the cross-linking agent is a carbodiimide compound, and the filler is a mixture of nano-zinc oxide and nano-titanium dioxide. The materials are subjected to drying, blending, melt extrusion, stretching forming and heat treatment to finally obtain a waterproof breathable film with a heat preservation effect, and meanwhile, the waterproof breathable film also has an ultraviolet-proof function.