10results about How to "Guaranteed flame retardant performance" patented technology

The invention relates to the technical field of composite films, in particular to a flame-retardant composite film and a preparation method thereof. The composite film is of an ABA type symmetrical three-layer co-extrusion structure, and functional division and synergistic interaction are achieved by concentrating a main flame-retardant function on a core layer (B layer) and distributing hydrolysis resistance and mechanical enhancement functions on a surface layer (A layer). The layer A comprises crystalline polyester, reinforcing master batch and an interface reinforcing agent; the layer B comprises crystalline polyester and composite flame-retardant master batch; the preparation method mainly comprises the following steps: respectively preparing the reinforced master batch and the composite flame-retardant master batch; respectively mixing the raw materials of the layer A and the layer B, drying and melting; co-extruding and casting through a three-layer co-extrusion die head with gradient temperature field control, and quenching a cast sheet; and preheating the cast sheet, and then carrying out synchronous two-way stretching, heat setting and cooling rolling. The film prepared by the invention has excellent halogen-free flame retardance, outstanding damp-heat aging resistance and high mechanical strength, and is suitable for the field with strict requirements on safety and durability.

The invention relates to the technical field of halogen-free phosphorus flame-retardant materials, in particular to a halogen-free phosphorus flame-retardant epoxy resin composition and application thereof in a high-heat-resistance copper-clad plate, and the halogen-free phosphorus flame-retardant epoxy resin composition comprises the following raw materials: novolac epoxy resin, a flame retardant, 2-ethyl-4-methylimidazole, a curing agent, fused silicon dioxide and flaky boron nitride. According to the flame retardant, a polyether amine flexible chain segment in a molecular structure of the flame retardant is compatible with an epoxy resin matrix, so that the possibility of phase separation and interface defects is reduced, and the mechanical property level of an epoxy resin cured product is favorably maintained while the flame retardant property is ensured; the epoxy group at the tail end enables the flame retardant to participate in a curing reaction, and is anchored in an epoxy three-dimensional network through a covalent bond, so that the risk of migration and precipitation of the flame retardant is reduced, and the durability and stability of the flame retardant property are ensured.

This invention discloses a fire-retardant substrate containing biomass fibers, an integrated fireproof door core, and its preparation method, belonging to the field of fireproof doors. The fireproof substrate of this invention introduces cellulose fibers into the adhesive layer of an inorganic filler matrix system of magnesium sulfate, magnesium hydroxide, and calcium hydroxide, and incorporates a specific styrene-acrylate copolymer. Simultaneously, the length of the cellulose fibers and the two key inorganic fillers, magnesium sulfate and magnesium hydroxide, are controlled, allowing the three to form a synergistic compatibility and cross-linking effect in the adhesive layer. This effectively optimizes the distribution of the overall components in the adhesive layer. While ensuring the interlayer bonding and flame-retardant performance of the resulting product, the waterproof effect of the adhesive layer is significantly improved without the need for waterproofing or water-absorbing agents. The fireproof substrate has good interlayer connectivity, high regularity, and strong durability. The product does not experience significant performance degradation even after long-term storage or in humid environments.

The application is a kind of precise forming method for printing magnesium alloy castings by gradient mixing of flame retardant in freeze casting. First, the components of the flame retardant are proportioned, then the shape and layer thickness of the high flame retardant and low flame retardant sand layer in the gradient sand mold are designed according to the structure characteristics of the typical magnesium alloy castings to be poured, and at the same time, the protection gas pipeline is designed in the low flame retardant sand layer combined with the structure of the castings. Subsequently, the control system sprays water binder onto the laid sand powder bed, layer by layer, to complete the preparation of the gradient sand mold. The printed gradient sand mold is frozen, and before pouring, SF6+CO2 protection gas is introduced through the reserved vent pipe, and after a period of aeration, low-temperature pouring is carried out to obtain magnesium alloy castings. The application can reduce the use of flame retardant, prevent explosion reaction with water vapor, reduce production cost, make the freeze casting technology play a role in the production of complex magnesium alloy castings, and meet the development requirements of green casting.

This invention discloses an anti-aging power metering box cabinet material, relating to the field of organic materials technology. The anti-aging power metering box cabinet material comprises the following raw materials by weight percentage: 25%-35% unsaturated polyester resin, 11%-15% low-shrinkage agent, 0.5%-2% initiator, 2.5-8% additives, 35%-50% organic composite filler, and 15%-25% modified chopped glass fiber. This application adds the prepared modified chopped glass fiber to the unsaturated polyester resin, along with the remaining additives required for preparing the electrical cabinet material, to obtain the cabinet material for use in power metering boxes. The power metering box cabinet material prepared in this application has advantages such as excellent mechanical properties, stable environmental aging resistance, low dielectric loss, and low dielectric constant.

The application discloses a kind of A class flame-retardant polyethylene cable material, by the following weight parts component composition: melt flow rate is 3~8g / 10min high density polyethylene resin 100 parts, linear low density polyethylene resin 35~55 parts, maleic anhydride graft ethylene vinyl acetate 5~15 parts, carbon black 3~5 parts, aluminum hydroxide 50~60 parts, magnesium hydroxide 10~30 parts, phosphorus-nitrogen flame retardant 2~8 parts, metal soap lubricant 3~6 parts, antioxidant 0.5~2 parts, diisononyl phthalate 1~5 parts, lauryl acrylate 2~5 parts, hyperbranched polyethylene imine 1~3 parts.The A class flame-retardant polyethylene cable material of the application guarantees flame-retardant performance at the same time, prolongs flame-retardant polyethylene environmental stress cracking time, exceeds 260 hours, so that the flame-retardant polyethylene cable material forms cable sheath, has better environmental stress cracking resistance performance.

The utility model discloses flame-retardant gridding cloth shaping equipment, which relates to the technical field of flame-retardant gridding cloth processing and comprises a worktable, a base welded on the outer wall of the top of the worktable, a cloth conveying mechanism, a cloth heat shaping mechanism and a cloth cooling mechanism. The cloth heat setting mechanism comprises a first heat setting assembly and a second heat setting assembly which are symmetrically distributed up and down, and a controller is fixedly installed on the outer wall of the back face of the machine base. According to the cloth heat setting mechanism provided by the utility model, on one hand, heat setting treatment can be simultaneously carried out on the two surfaces of the flame-retardant gridding cloth through the electric heating upper setting roller and the electric heating lower setting roller which are symmetrically arranged up and down; and on the other hand, the distance between the electric heating lower shaping roller and the electric heating upper shaping roller can be flexibly adjusted, so that in the heat shaping process, the tension degree of the flame-retardant gridding cloth can be flexibly adjusted according to different shaping conditions, and the shaping effect of the flame-retardant gridding cloth can be improved.

The invention discloses a flame-retardant polycarbonate film / sheet and a preparation method thereof, and belongs to the field of high polymer material preparation. The material comprises the following components in parts by weight: 25-89 parts of bisphenol A polycarbonate, 3-15 parts of silicon copolymerized polycarbonate, 5-20 parts of high-temperature polycarbonate, 2-20 parts of a flame retardant, 1-10 parts of a toughening agent and 0-10 parts of other auxiliaries, the high-temperature polycarbonate is obtained by introducing a biphenyl group into bisphenol A polycarbonate. The preparation method comprises the following steps: mixing all the components, carrying out melt extrusion by using a twin-screw extruder at the temperature of 190-320 DEG C to obtain particles, drying the particles at the temperature of 80-125 DEG C, carrying out tape casting extrusion by using a tape casting extruder at the temperature of 190-320 DEG C, cooling on a cold roller at the temperature of 60-150 DEG C, and casting to obtain the flame-retardant polycarbonate film / sheet with the thickness of 25-2000 microns. The product does not contain PFAS substances, accords with the development direction of environmental protection, has the flame retardant property reaching VUL94 V-0 / VTM-0, and can be widely applied to the fields of electronics, electricity, new energy and the like.

The application belongs to the technical field of high polymer materials, and discloses a flame-retardant hydrophobic copolymer nylon material, a preparation method and application thereof. A low steric hindrance short-chain perfluoroalkyl hydrophobic unit (modified with heptafluoro) and a DOPO flame-retardant unit are integrated in a single caprolactam monomer and embedded in a polymer main chain, so that a hydrophobic barrier is constructed to protect the flame-retardant structure from hydrolysis, a stable mechanism of synergistic enhancement of the two is constructed, and a technical bottleneck that the prior art cannot guarantee long-term safety and reliability of the material under high-humidity harsh environment at the same time is overcome.

This invention belongs to the technical field of flame-retardant polyether polyols and their preparation, specifically relating to a method for preparing a highly flame-retardant phosphazene-based polyether polyol. The method involves a nucleophilic substitution reaction between hexachlorocyclotriphosphazene and water in the presence of an acid-binding agent, generating a polyhydroxyl-containing phosphazene derivative as an initiator. Using this initiator as the core, other small-molecule polyols are combined, and propylene oxide undergoes ring-opening polymerization under the action of a catalyst to form a polyether polyol with a "phosphazene ring-polyether chain" structure. Due to the presence of the phosphazene ring in the molecule, this product possesses both excellent flame-retardant properties and good reactivity, and can be directly used to synthesize flame-retardant rigid polyurethane foams, elastomers, and other materials, solving the problem of requiring additional flame retardants in traditional polyether polyols. This invention features highly controllable processes, readily available raw materials, and a product with excellent comprehensive performance, making it highly valuable for industrial applications.