33results about How to "Give full play to the synergistic flame retardant effect" patented technology

The invention discloses a preparation method of a phosphorus-nitrogen-carbon-containing aggregate and intumescent flame retardant of a nano-sheet structure. The preparation method is characterized in that phytic acid, melamine and a solvent are prepared, the substance amount ratio of the phytic acid to the melamine is 1: 3 to 1: 15, and 20-50 ml of the solvent is added into every 0.01 mol of the melamine; the melamine is added into a reaction container provided with a thermometer and a stirrer, the solvent is added with stirring, the phytic acid is added at the temperature of 20-40 DEG C, and a reaction is conducted with stirring for 20-50 minutes, so that reaction liquid is obtained; and the reaction liquid is poured into a reaction still to react for 24-56 h at the temperature of 70-120 DEG C, cooling and suction filtration are conducted, solid is washed with ethyl alcohol and then washed with water till the pH is 7, and the solid is dried, so that the flame retardant is obtained. The preparation method is simple and environmentally friendly, and the synthesized phosphorus-nitrogen-carbon-containing aggregate and intumescent flame retardant of the nano-sheet structure has good compatibility with a polymer matrix and has good flame retardance.

The invention relates to an intumescent flame retardant used for an outer cover of an ABS (acrylonitrile-butadiene-styrene) appliance switch as well as a preparation and an application of the intumescent flame retardant. The flame retardant is prepared from components in parts by weight as follows: 40-80 parts of piperazine pyrophosphate, 20-60 parts of melamine or a melamine derivative, 0-15 (except 0) parts of a charring agent, 0-15 (except 0) parts of a synergist, 0.2-1 part of an antioxidant and 0-1 (except 0) part of a smoke inhibitor. During preparation, substances are mixed and stirred uniformly, and the product is obtained; during application, 0.4-0.5 g of the flame retardant is added to every 1 g of ABS resin. Compared with the prior art, the flame retardant is easy to prepare and has good compatibility with an ABS matrix, the surface of a flame-retardant ABS material prepared from the flame retardant does not absorb moisture and does not migrate, and the flame-retardant ABS material can reach the UL94V-0 level, has remarkably reduced specific optical density Ds10 of smoke and can be used for processing and preparation of the outer cover of the ABS appliance switch with an injection molding process and can pass tests of 750 DEG C glowing filaments.

The invention relates to a halogen-free flame retardant PC (poly carbonate) composition. The halogen-free flame retardant PC composition comprises the following components in percentage by weight: 68-87.5% of PC resin, 10-20% of styrene-acrylonitrile-N-phenyl maleic imide-cyclopentene copolymer, 1-5% of phosphorus based flame retardant, 1-5% of SMA (styrene maleic anhydride) random copolymer, 0.5-1.0% of antioxidant and 0-1.0% of lubricating agent. The halogen-free flame retardant PC composition provided by the invention fully achieves phosphorus-nitrogen synergistic flame retardant effect, flame retardant performance of a PC material is improved, addition amount of phosphate ester flame retardant is greatly reduced, the defect that heat resistance of the traditional phosphorus flame retardant PC resin is poor is overcome, and the obtained halogen-free flame retardant PC composition has excellent flame retardant property, high thermal deformation temperature, good comprehensive mechanical property and moderate cost.

The invention discloses a preparation method and application of a bio-based flame-retardant compatilizer for PBAT (poly (butylene adipate-co-terephthalate)). The bio-based flame-retardant compatilizer is prepared by the following process: carrying out grafting reaction on Fischer-Tropsch wax and maleic anhydride to obtain Fischer-Tropsch wax acid, dispersing the prepared Fischer-Tropsch wax acid and soybean protein isolate, and reacting with phytic acid in a solution to obtain the bio-based flame-retardant compatilizer. According to the bio-based flame-retardant compatilizer prepared by the invention, a novel flame retardant chemical structure with synergistic flame-retardant and compatible effects is obtained by using raw materials from bio-based sources, and the flame retardant does not influence the biodegradability of PBAT, can also play a lubricating role in the processing process, inhibits hydrolysis in the processing process, and has the advantages of favorable flame retardancy, favorable flame retardancy, favorable flame retardancy, favorable flame retardancy, favorable flame retardancy, favorable flame retardancy, favorable flame retardancy, favorable flame retardancy, favorable flame retardancy, favorable flame retardancy and favorable flame retardancy. And the method has very important practical significance for broadening the actual application scene of the PBAT.

The invention discloses a coated fire retardant. The coated fire retardant comprises a core material containing a phosphorus-nitrogen fire retardant of which the particle size is 0.5-70[mu] m, and the outer surface of the core material is covered with a coating layer coated with a dialkyl phosphinate fire retardant, the particle size of the core material of the phosphorus-nitrogen fire retardant is preferably 5-35 [mu]m. The phosphorus-nitrogen fire retardant in the coated fire retardant is a synergist of the dialkyl phosphinate fire retardant, the efficient recombination of the dialkyl phosphinate fire retardant and the phosphorus-nitrogen fire retardant can be realized by the coated fire retardant, the problem that a complex fire retardant mixture is not dispersed uniformly in a resin can be solved, the synergistic flame-retardant effect of the two components can be given into play maximally, and the coated fire restardant has a better synergism in comparison with the complex fire retardant mixture; meanwhile, dialkyl phosphinate which is uneasily separated out of a molding composition can be served as a shell which covers the surface of the phosphorus-nitrogen fire retardant, so as to solve the problem that the phosphorus-nitrogen fire retardant is easy to migrate and separate out of the molding composition in a hot and humid environment can be solved to a great extent, and the surface performance of the molding composition can be greatly optimized.

The invention relates to a preparation method of capsule-coated magnesium hydroxide fire retardant, comprising the following steps: adding magnesium hydroxide micropowder into water to prepare aqueous phase component suspension; mixing a free radical polymerization monomer, a cross-linking agent and an initiator, and evenly stirring to prepare into an oil phase component; adding the prepared oil phase component into the aqueous phase component suspension, and evenly stirring to obtain mixed liquor; heating the mixed liquor, stirring, and lowering the temperature to room temperature; filtering and separating the mixed liquor; separating out the magnesium hydroxide capsule; washing the magnesium hydroxide capsule to obtain a magnesium hydroxide capsule wet cake; and drying to obtain the capsule-coated magnesium hydroxide fire retardant, wherein the binding force of a coating layer and the magnesium hydroxide formed by the free radical polymerization monomer, the cross-linking agent and the initiator is strong. The capsule-coated magnesium hydroxide fire retardant has the advantages of good compatibility of the coating layer and a high polymer matrix material, large interface binding force, evenly dispersed magnesium hydroxide micropowder, cooperated inflaming retarding of the magnesium hydroxide and the capsule, and high inflaming retarding efficiency.

The invention discloses a phosphor-silicon-containing aggregated flame retardant and a preparation method thereof. The preparation method comprises the following steps: adding 10-(2,5-dihydroxy phenyl)-9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and an acid-binding agent into a reactor loaded with a burette, a condensing tube and a nitrogen protection device, heating to 40 to 100 DEG C; weighing R1, R2-dichlorosilane, adding a solvent, and adding the mixture into the burette; adding the mixture at the temperature of 40 to 100 DEG C dropwise, and performing a thermal reaction for 2 to 10 hours after finishing of dropping; adding a precipitant, performing suction filtration, washing filter cakes with the precipitant, and drying to obtain the phosphor-silicon-containing aggregated flame retardant. The phosphor-silicon-containing aggregated flame retardant has high phosphor content and silicon content, abundant carbon sources, high char forming characteristic, superior flame retardance and thermal stability, and can be applied to high-molecular materials such as flame-retardant polypropylene, polystyrene and epoxy resin.

The invention provides a reinforced flame-retardant polypropylene composite. The composite is prepared from raw materials in parts by weight as follows: 100 parts of polypropylene, 3-5 parts of a halogen flame retardant, 0.01-0.5 parts of an antioxidant, 0.2-0.4 parts of an initiator and 15-20 parts of magnesium salt whiskers. The reinforced flame-retardant polypropylene composite has the tensilestrength larger than or equal to 32.4 MPa, the impact strength larger than or equal to 4.1 kJ.m<-2> and the flame-retardant performance of class V0 and has good mechanical performance and flame-retardant performance. Meanwhile, a preparation method of the reinforced flame-retardant polypropylene composite is simple, easy to control and suitable for industrial production.

The invention discloses a high-performance environment-friendly kraft liner board, which comprises a bottom layer, a surface layer and a coating layer which are sequentially arranged from bottom to top; wherein: the bottom layer is made of modified wood flour pulp and short fiber pulp Obtain; The surface layer is made from the surface layer pulp composed of long fiber pulp and short fiber pulp; The coating layer is formed by coating the flame retardant styrene-acrylic latex on the surface layer; The long fiber pulp, The short-fiber pulp is formed by pulping domestic old corrugated boxes; the flame-retardant styrene-acrylic latex is composed of a modified composite flame retardant, functionalized modified styrene-acrylic latex and water. The invention adopts the compound flame retardant latex metering roller coating method to add the flame retardant, without loss, low cost, and the addition of the flame retardant has no adverse effect on the strength of the paper. In addition, the flame retardancy of the kraft liner board prepared by the present invention is good, because the kraft box preparation product of the present invention is produced entirely from waste paper, the process is environmentally friendly, and the functionalized modified styrene-acrylic latex is water-soluble latex without organic solvents, which improves the environmental protection.

The invention relates to a preparation method of an MF (melamine-formaldehyde) resin-coated Mg / Al-LDHs (magnesium / aluminum-layered double hydroxide) microcapsule. The preparation method comprises the following steps of firstly mixing melamine and formaldehyde according to a molar ratio of 1 to (2 to 4), so as to prepare a clear and transparent MF prepolymer; then, using deionized water as a dispersing medium, and preparing a flame retardant agent Mg / Al-LDHs into a core emulsion under the action of an emulsifying agent; using an in-situ polymerizing method to coat the MF prepolymer around capsule core emulsion droplets, adjusting the pH (potential of hydrogen) value of a solution to weak acid, and enabling the MF prepolymer to further complete condensation reaction at the surface of the Mg / Al-LDHs, so as to generate an insoluble latticed crosslinking structure, and form a capsule wall with certain thickness and strength; finally, using absolute ethyl alcohol to wash for multiple times, drying at the temperature of 60 DEG C, and grinding, so as to obtain the MF-coated Mg / Al-LDHs microcapsule. The preparation method has the advantages that the synergistic flame-retardant function of the nitrogen flame-retardant agent and the Mg / Al-LDHs is fully realized, and the problem of poor dispersivity and compatibility of the flame-retardant agent in a substrate is solved; meanwhile, the preparation technology is simple, and the cost is low.

The invention discloses a sepiolite nano flame-retardant fiber with the diameter of 10-60 nanometers, wherein the mass ratio of sepiolite nano fibers to bis-spironaphthoxazine group expanding type flame-retardant polymers is 1: 0.1-0.5; Si-O stretching vibration peaks between 900 cm<-1> and 1000 cm<-1> in an infrared spectrogram are obviously strengthened, and Si-O-Si stretching vibration peaks between 1000 cm<-1> and 1100 cm<-1> are obviously weakened. The invention also discloses a method for preparing the sepiolite nano flame-retardant fiber and a flame-retardant composite material using the same for strengthening and toughening. The invention improves the compatibility of the sepiolite nano flame-retardant fiber in a polymer base material by organically combining the sepiolite nano flame-retardant fiber with a polymeric type expansion flame-retardant agent together through grafting, thereby not only being beneficial to the uniform dispersion of the expanding type flame-retardant agent in the polymer base material, sufficiently playing the synergistic flame-retardant role between the expanding type flame-retardant agent and the polymer base material and enhancing the flame-retardant efficiency, but also playing a role of enhancing the strength and the toughness of polymer materials.