20 results about "Expandable microsphere" patented technology

The present invention relates to tannin-based heat-expandable microspheres, and also to a process for their preparation. The heat-expandable microspheres comprise a thermoplastic shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the thermoplastic shell comprises tannin.

The invention relates to a composition comprising at least one thermoplastic polyamide, wherein the average carbon content of the repeating units of said at least one thermoplastic polyamide is greater than or equal to 7; from 0.1 to 6.0 % by weight of expandable microspheres, based on the total weight of the composition; and optionally at least one additional thermoplastic polymer; wherein the composition has a melt flow index lower than or equal to 150 g / 10 min. The invention also relates to a method for preparing such a composition, to an expanded composition obtainable from such a composition and to a method for producing said expanded composition.

This invention discloses a tearable shielded railway digital signal cable and its manufacturing method. The cable, from the inside out, comprises a cable core, an inner sheath, a shielding layer, and an outer sheath. The shielding layer includes: a functional composite layer, which is an integrated film containing a polyolefin matrix, conductive filler, and adhesive modifier; a structural carrier layer, which is a fiber-reinforced layer with a tensile strength greater than its transverse tensile strength along the cable length; and an outer sheath comprising an adhesive inner layer and a foamed outer layer. The adhesive inner layer contains dispersed thermally expandable microspheres; the structural carrier layer has openings. During the molding process of the outer sheath, the thermally expandable microspheres expand under heat and are squeezed into the openings of the structural carrier layer. After cooling, the adhesive inner layer and the structural carrier layer interlock. The cable of this invention possesses stable shielding layer peel performance, a uniform and lightweight foamed sheath structure, and reliable interlayer bonding, comprehensively improving construction convenience, electromagnetic shielding effectiveness, flexibility, and long-term reliability.

The invention relates to a composition comprising at least one copolymer comprising polyamide blocks and polyether blocks having a number average molecular weight of from 20 000 to 100 000 g / mol, preferably from 25 000 to 80 000 g / mol and wherein the mass ratio of the polyamide blocks relative to the polyether blocks of the copolymer is more than 1; from 0.1 to 6.0 % by weight of expandable microspheres, based on the total weight of the composition; optionally at least one UV stabilizer and / or UV absorber; and optionally at least one additional thermoplastic polymer. The invention also relates to a method for preparing such a composition, to an expanded composition obtainable from such a composition and to a method for producing said expanded composition.

This invention belongs to the field of cushioning packaging technology, and provides a high-performance composite plant fiber foam material, its preparation method, and its application. In the preparation process, thermally expandable microspheres are first added to a cross-linked fiber mixture, and an initial bubble network is formed through high-speed shearing and stirring. After filtration, the microspheres are heated in an oven to trigger expansion, and the resulting supporting force compensates for drying shrinkage. The material obtained by this process has low density, stable cell structure, excellent cushioning performance and flame retardancy, and the raw materials used are biodegradable, making it a green and environmentally friendly cushioning packaging material suitable for packaging applications such as express delivery and electronic products.

A pressure-sensitive adhesive tape of the present invention includes thermally expandable microspheres, wherein the thermally expandable microspheres are each formed of a shell and a volatile substance contained in the shell, and wherein the shell is formed of a resin having a glass transition temperature (Tg) of 120° C. or more. In one embodiment, the resin for forming the shell contains a constituent unit having a carboxyl group.

Explosives using thermally expandable microspheres (TEMs) in a solid matrix are disclosed that facilitate tunable changes in local density, porosity, and ultimately, shock sensitivity. Solid high explosive systems with “on demand” shock sensitivity may be created. A relatively small fraction (e.g., 1% or less) of TEMs may incorporated during the manufacturing process of the solid matrix explosive (e.g., polymer-bonded explosives (PBX), trinitrotoluene (TNT), etc.). The fraction of TEMs used to achieve the desired explosive properties will depend on the base explosive material to achieve the desired initiation sensitivity.

The invention relates to storage stable thermally expandable microspheres comprising a polymeric shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the polymeric shell comprises a carboxylate-functionalised cellulose, wherein the microspheres retain at least 80% of the original weight of blowing agent encapsulated in the microspheres after six months of storage under ambient conditions. The invention further relates to a process for preparing storage stable thermally expandable microspheres comprising a polymeric shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the polymeric shell comprises a carboxylate-functionalised cellulose, the method comprising the following steps: (i) preparing thermally expandable microspheres comprising a polymeric shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the polymeric shell comprises a carboxylate-functionalised cellulose; and (ii) subjecting the thermally expandable microspheres obtained in step (i) to a post heating treatment by heating the thermally expandable microspheres to a temperature of at least 40° C.

The application discloses thermally expandable microspheres, a preparation method and application thereof. The thermally expandable microspheres comprise, from inside to outside, a core, a transition layer and a functional layer. The core comprises isobutane and peroxide. The transition layer is a layer of acrylonitrile / glycidyl methacrylate copolymer. The functional layer comprises polydopamine and particles with antibacterial properties attached to the surface of the polydopamine. The thermally expandable microspheres have high thermal stability and can withstand 200 DEG C / 30 min heat pressing, and meanwhile have antibacterial properties. Further, the thermally expandable microspheres can further comprise a hydrophobic and / or flame-retardant layer. The thermally expandable microspheres have a wide range of applications and can meet different requirements.

A ceramicized composite material, its preparation method, and its application, comprising, by weight: 100 parts of silicone rubber matrix; 50-120 parts of ceramic-forming filler system; 10-40 parts of active fire extinguishing microcapsules; 5-20 parts of sacrificial template agent; and 2-10 parts of synergistic additives. The ceramic-forming filler system, by weight, comprises: 30-60 parts of synthetic fluorophlogopite powder; 15-40 parts of low-melting-point glass powder; and 5-20 parts of reinforcing skeleton filler. The core material of the active fire extinguishing microcapsules is perfluorohexanone; the wall material of the active fire extinguishing microcapsules has a double-layer structure, with an inner layer of melamine resin and an outer layer of polyurea or silica grafted with vinyl groups. The sacrificial template agent is a core-shell structured thermoplastic expandable microsphere, with a core material of liquid alkane and a shell material of a copolymer of vinylidene chloride, acrylonitrile, and methyl methacrylate; the expansion temperature of the sacrificial template agent is 180°C-220°C, and its pyrolysis temperature is 300°C-400°C. This invention has the advantages of active flame suppression, ultra-low thermal conductivity, and robust structure.

This application provides a C-S bond crosslinked high-temperature thermal expansion microsphere and its preparation method. The high-temperature thermal expansion microsphere includes a microsphere shell and a core structure encapsulated inside the microsphere shell. The core structure includes a foaming agent. The microsphere shell is formed by copolymerization of an olefinic unsaturated monomer and a crosslinking agent. The crosslinking agent includes at least a thiol-containing crosslinking agent, which participates in the copolymerization reaction to form the C-S bond crosslinking network of the microsphere shell. This application introduces a thiol-containing crosslinking agent with good compatibility with the foaming agent to copolymerize with the monomer and participate in the formation of the microsphere shell. This significantly optimizes the foaming temperature range, sphericity, and expansion ratio of the microspheres, and significantly improves the maximum foaming temperature and expansion performance of the microspheres.

This invention discloses a wine cap anti-counterfeiting label material, an anti-counterfeiting triggering method, and its application. From bottom to top, it comprises: a release paper layer, an adhesive layer, a heat-shrinkable film layer, an active destruction layer, a multi-level thermochromic layer, and an inkjet information layer. The adhesive layer is a pyrolytic acrylic pressure-sensitive adhesive. The heat-shrinkable film layer is a uniaxially stretched regenerated cellulose film, with the difference between the longitudinal and transverse shrinkage rates ≥10%. The active destruction layer includes thermo-expandable microspheres and microcapsules. The thermo-expandable microspheres expand 5-10 times in volume at 60-80℃, and the microcapsules have a wall material of a thermomeltable polymer and encapsulate reactive chemical substances inside. The multi-level thermochromic layer includes a first thermochromic sublayer and a second thermochromic sublayer. The triggering temperature of the first thermochromic sublayer is 50-60℃, and the triggering temperature of the second thermochromic sublayer is 65-75℃, ensuring that the label cannot be completely retained after heating.

This invention relates to the field of polymer composite materials technology, specifically to an aramid composite foam material and its preparation method. The raw materials of the aramid composite foam material include: 0.5-1 parts of meta-aramid chopped fibers; 0.2-0.5 parts of meta-aramid precipitate; 0.05-0.2 parts of thermally expandable microspheres; 2-10 parts of water-based adhesive; 0.5-1 parts of surfactant; and 15-50 parts of deionized water. The preparation method of the meta-aramid precipitate is as follows: meta-phenylenediamine and isophthaloyl chloride are polymerized in a polar solvent to obtain a meta-solvent; the meta-solvent is then fully dispersed in water, followed by solid-liquid separation to obtain the meta-aramid precipitate. The aramid composite foam material exhibits uniform structure, low density, high strength, and temperature resistance with flame retardancy, and the preparation method is green and efficient.

The application discloses a kind of high-thermal-conductivity porous carbon skeleton materials and preparation method and application thereof, belong to the technical field of heat-conducting composite material.The method comprises the following steps: immerse C / C composite material in phenolic resin precursor solution containing expandable microspheres, carry out vacuum impregnation treatment, obtain impregnated composite material;Impregnated composite material is sequentially subjected to mold foaming treatment, heating curing treatment, normal pressure drying treatment, carbonization treatment, chemical vapor deposition treatment and high-temperature heat treatment, and high-thermal-conductivity porous carbon skeleton material is prepared;Wherein, expandable microspheres are acrylic polymer microspheres containing closed liquid alkane gas.By thermoplastic foaming, multi-level pore structure is accurately constructed, combined with chemical vapor deposition and high-temperature graphitization treatment, active regulation of carbon skeleton pore size and high-order crystal structure are realized, and the contradiction that traditional porous carbon material is difficult to consider high specific surface area and high mass transfer is solved, and the thermal conductivity and structural designability are significantly improved.

The present invention aims to provide a thermally expandable microsphere having less change in expandability over a wide temperature range and use thereof. The present invention provides a thermally expandable microsphere comprising a shell containing a thermoplastic resin (A), and a blowing agent enclosed in the shell and gasified by heating, which satisfies the following Condition 1. Condition 1: the glass transition temperature (Tg0) of a thermoplastic resin (A1) obtained by immersing the thermally expandable microsphere in tetrahydrofuran and the glass transition temperature (Tg1) of a thermoplastic resin (A2) obtained by immersing a treated product obtained by heating the thermally expandable microsphere at a temperature 20°C higher than the maximum expansion temperature thereof for 10 minutes in tetrahydrofuran have the following formula (I). (Tg1) - (Tg0) > 0°C Formula (I)

This invention discloses a positive electrode sheet and its preparation method, as well as a secondary battery, belonging to the field of lithium-ion battery technology. The positive electrode sheet provided by this invention includes a positive electrode current collector and a positive electrode active material layer disposed on the current collector. A functional coating is also disposed on the surface of the positive electrode active material layer. Based on the total mass of the functional coating, the functional coating comprises: 15-30 wt% lithium replenishing agent; 12-25 wt% porous conductive carbon; 5-10 wt% binder; and 40-60 wt% thermally expandable microspheres with HF scavenging agent loaded on their surface. This invention systematically integrates the three functions of efficient lithium replenishment, long-lasting interface protection, and active thermal safety into a single coating structure, synergistically improving the battery's initial coulombic efficiency, cycle life, and thermal safety, overcoming the defects of existing technologies where functional modules are separate, have poor synergy, and even mutually restrict each other.

This disclosure relates to a protective hood comprising an energy-absorbing material including at least one thermoplastic elastomer (TPE) and a foaming agent comprising expandable microspheres, wherein the at least one TPE is a styrene-based thermoplastic elastomer (TPS), and wherein the energy-absorbing material comprises 4% to 10% by weight of the foaming agent.

Tannin-based thermally expandable microspheres comprise a thermoplastic shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the thermoplastic shell comprises tannin.

The application discloses a kind of polytetrafluoroethylene microporous membrane with controllable porosity and its preparation method and application in marine antifouling, belong to polytetrafluoroethylene film processing and manufacturing technical field, the polytetrafluoroethylene film is prepared by blending nano heat swellable microspheres in polytetrafluoroethylene granules in the application, then melt modification is added on the film Anti-fouling particles, remove auxiliary oil by heating, in this process, microspheres are expanded and broken by heating, and form polytetrafluoroethylene microporous membrane with uniform pore size;The application utilizes surface enrichment strategy, forms antifouling layer in the outermost layer of polytetrafluoroethylene film, so that filler is not directly blended with polytetrafluoroethylene matrix, overcome the problem that filler is agglomerated in polymer matrix, unevenly dispersed, avoid the weakening of mechanical properties of polytetrafluoroethylene microporous membrane caused by the addition of filler;High-temperature physical foaming method is used in the preparation process of the application, simple operation and green, can be widely applied in medical and health materials, water treatment and air purification and other fields.